Answer:NF3 is the correct formula for nitrogen trifluoride.
Explanation:
In the given question, the correct formula for nitrogen trifluoride is [tex]\rm NF_3[/tex].
Nitrogen trifluoride is a covalent compound that is composed of one nitrogen atom and three fluorine atoms.
The nitrogen atom shares one of its valence electrons with each of the three fluorine atoms to form three single covalent bonds. The resulting molecule has a trigonal pyramidal shape, with the nitrogen atom at the center and the three fluorine atoms arranged around it.
The prefix "tri-" in the name of the compound indicates that there are three fluorine atoms in the molecule.
Therefore, [tex]\rm NF_3[/tex] is the correct formula for nitrogen trifluoride.
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what is responsible for the intense heat and pressure in the sun's core?
Answer:
Nuclear Fusion
Explanation:
This creates heat and protons that can heat up the sun
The core is composed of hot, dense plasma. The process nuclear fusion is responsible for the intense heat and pressure in the sun's core.
What is nuclear fusion?The process in which two lighter nuclei fuse together to form a heavier nucleus with the simultaneous release of a huge amount of energy is defined as the nuclear fusion.
Some mass is always lost during this process and this is converted into energy in accordance with Einstein's equation, E = mc². This huge amount of energy is released.
The fusion reactions are common in the interior of stars. The energy of our sun is believed to arise from a number of complex fusion steps. The net reaction is:
4 (₁¹H) → ₂⁴He + 2 (₊₁⁰e) + energy
During nuclear fusion in the core photons and neutrinos are released. These particles carry and emit the light, heat and energy of the sun.
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Natural resources like oil and copper metal take a very long time to form. Because of this, they are known as A) fossil fuels. B) vital resources. C) renewable resources. D) non-renewable resources.
Answer:
d) non-renewable resources
Explanation:
A natural resource such as coal, gas, or oil that, once consumed, cannot be replaced. Most energy resources currently in use are non-renewable while the renewable ones (such as wind and solar power) are not well developed. Also called depletable resource.
Answer: Non renewable resources.
Explanation: The non renewable resources can be defined as the resources that once used cannot be replenished. The resources like oil and copper takes very long time to form and this makes it non-renewable.
The natural resources like oil takes a long time to form inside the ocean and its extraction is also done after long time because its formation takes time.
What is the mass in grams of 0.000142 mole of vitamin C
Answer:
0.16 rounded
Explanation:
I used a calculator to get this answer, one that compared grams and mol.
The mass of 0.000142 mole of vitamin C is approximately 0.025 grams. This is derived by multiplying the number of moles by the molar mass of vitamin C, which is 176.124 g/mol.
The mass in grams of 0.000142 mole of vitamin C can be calculated by using the formula:
Mass (grams) = number of moles x molar mass (g/mol)
Calculating the Mass of Vitamin C
We have 0.000142 mole of vitamin C, and the molar mass of vitamin C (ascorbic acid) is 176.124 g/mol. By multiplying these values, we get:
Mass = 0.000142 moles x 176.124 g/mol = 0.025010168 grams
Therefore, the mass of the recommended daily dietary allowance of vitamin C for children aged 4-8 years is approximately 0.025 grams.
a container holds 136.5 of SO2 at 20.°c and 125 mmHg. what will the volume of the SO2 if the pressure is decreased to 156.7 mmHg
Answer:
108.9 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have different values of P and V:(P₁V₁) = (P₂V₂).
P₁ = 125 mm Hg, V₁ = 136.5 mL,
P₂ = 156.7 mm Hg, V₂ = ??? mL.
∴ V₂ = (P₁V₁)/(P₂) = (125 mm Hg)(136.5 mL)/(156.7 mm Hg) = 108.9 L.
This stage of cellular respiration ends with two ATP molecules and two NADH molecules. A. Krebs cycle B. Electron transport chain C. Calvin cycle D. Glycolysis
Answer:
D. Glycolysis
Explanation:
In glycolysis, energy is required to break a molecule of glucose into two pyruvate molecules. These two pyruvate molecules are used during pyruvate oxidation; which is stage II of cellular respiration.
During glycolysis, two molecules of ATP are used and four molecules of ATP are produced. So there is a net gain of two ATP molecules. Hydrolysis of a glucose molecule produces high energy electrons which are used to reduce two NAD+ molecules to NADH.
These two molecules are used in the citric acid cycle to produce more ATP molecules.
The stage of cellular respiration that ends with two ATP molecules and two NADH molecules is Glycolysis. Therefore, option D is correct.
Glycolysis is the first stage of cellular respiration, occurring in the cytoplasm of the cell. It involves the breakdown of glucose into two molecules of pyruvate.
During glycolysis, a net gain of two ATP molecules and two NADH molecules is produced.
The ATP molecules generated in glycolysis are formed through substrate-level phosphorylation, where a phosphate group is transferred directly from a high-energy molecule to ADP, forming ATP.
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A gas occupies a volume of 180 mL at 35.5°C and 53.9 kPa. What is the volume of gas at STP in mL?
Answer:
Volume of the gas under STP is 84.7 mL.
Assumption: the gas is ideal.
Explanation:
How many moles of particles in this gas?
Convert all units to SI units before applying the ideal gas law.
The volume shall be in cubic meters: [tex]\displaystyle V = \rm 180\;mL \times \frac{1\;\text{m}^{3}}{10^{6}\;mL} = 1.80\times 10^{-4}\;m^{3}[/tex].The temperature shall be in degrees Kelvins: [tex]T =\rm 35.5\;\textdegree{C} = (35.5 + 273.15)\;K = 308.65\;K[/tex]The pressure shall be in Pascals: [tex]\displaystyle P = \rm 53.9\;kPa \times \frac{10^{3}\;Pa}{1\;kPa} = 5.39\times 10^{4}\;Pa[/tex].The ideal gas constant: [tex]R \approx \rm 8.314\;Pa\cdot m^{3}\cdot K^{-1}\cdot mol^{-1}[/tex].
The ideal gas law:
[tex]P \cdot V = n \cdot R\cdot T[/tex]
Rearrange the ideal gas law to find the number of moles of particles [tex]n[/tex] in this gas:
[tex]\displaystyle n = \frac{P\cdot V}{R\cdot T} = \frac{5.39\times 10^{4}\times 1.80\times 10^{-4}}{8.314\times 308.65} = \rm 3.78081\times 10^{-3}\;mol[/tex].
The volume of one mole of an ideal gas under STP is 22.4 liters. The volume of [tex]\rm 3.78081\times 10^{-3}\;mol[/tex] of gas will be:
[tex]\rm 3.78081\times 10^{-3}\;mol\times 22.4\;L\cdot mol^{-1} = 0.0846901\;L = 84.7\; mL[/tex].
All three values in the question come with three significant figures. Keep more significant figures than that in calculations and round the final answer to three significant figures. Hence the answer: 84.7 mL.
In the reaction 2NaCl + 2H2O → 2NaOH + C12 + H2, the reactants should:
weigh more than the products because the reaction isn't perfect.
weigh less than the products because mass is lost.
weigh the same as the products.
weigh more because Cl2 and H2 are gases.
Answer:
D
Explanation:
Tough question. Both Cl2 and H2 are gases. Everything depends on what the water is. If it's a liquid, then D is the answer. If it's a gas, then you have to be a little more careful.
2H2O = 2 * 18 = 36.
Cl2 = 2*Cl = 2 * 35.5
Cl2 = 71
So D is still the answer.
Answer: weigh the same as the products.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
[tex]2NaCl+2H_2O\rightarrow 2NaOH+Cl_2+H_2[/tex]
Given:
Mass of products = Mass of sodium hydroxide + mass of chlorine + mass of hydrogen = 2(40)+1(71)+2(1)= 153 g
Mass of reactants = Mass of sodium chloride + mass of water = 2(58.5)++2(18)= 153 g
Thus the total mass of reactants is equal to the total mass of products.
Using the phase diagram for H2O, which of the following correctly describes water at 0°C and 1 atm?
At the melting point. Draw a line up from 0 degrees and a line to the right from 1 atm. They meet at the line between solid and liquid... the melting point
Answer: it's boiling point!
Explanation:
Practice Explaining Heat Flow
Examine the image showing a pan of boiling
eggs on a gas burner. What is the path of heat
flow?
a) hot gas - pan -> eggs - water
b) pan ->hot gas - eggs > Water
c) burning gas - pan -* water - eggs
d) eggs — water - burner - pan
e) pan - water - eggs - burner
Dona
Answer:
The right choice is "burning gas → pan → water → eggs"
Explanation:
Heat will flow from the body of higher temperature to the cooler body.
So, heat will firstly flow from burning gas to pan by conduction then to the water in contact with pan then to the egg present inside the water.
So, the right choice is :
"burning gas → pan → water → eggs"
Answer: Option (c) is the correct answer.
Explanation:
When two objects of different temperature come in contact with each other then heat will flow from hot object to cold object. This process of transfer of heat is known as conduction.
For example, a pan of boiling eggs on a gas burner will have transfer of heat from gas burner to the pan and then heat will flow from water to the eggs.
This process is also a conduction process.
Thus, we can conclude that the path of heat flow will be as follows.
[tex]\text{burning gas} \rightarrow \text{pan} \rightarrow \text{water} \rightarrow \text{eggs}[/tex]
A chemical process dissolves 500 milligrams of iron oxide every 20 minutes. How long would it take this reaction to dissolve 2 lbs of iron oxide?
Answer:
[tex]\boxed{\text{25 da}}[/tex]
Explanation:
Step 1. Convert pounds to milligrams
(a) Pounds to grams
[tex]\text{Mass} = \text{2 lb} \times \dfrac{\text{454 g}}{\text{1 lb}} = \text{910 g}[/tex]
(b) Grams to milligrams
[tex]\text{Mass} = \text{910 g} \times \dfrac{\text{1000 mg}}{\text{1 g}} = \text{910 000 mg}[/tex]
Step 2. Calculate the time
(a) Milligrams to minutes
[tex]t = \text{910 000 mg}} \times \dfrac{\text{20 min}}{\text{500 mg}} = \text{36 000 min}[/tex]
(b) Minutes to hours
[tex]t = \text{36 000 min} \times \dfrac{\text{1 h}}{\text{60 min}} = \text{610 h}[/tex]
(c) Hours to days
[tex]t = \text{ 610 h} \times \dfrac{\text{1 da}}{\text{24 h}} = \text{25 da}[/tex]
It will take [tex]\boxed{\textbf{25 da}}[/tex]to dissolve the iron oxide.
Answer : The time taken for the reaction is 36363.64 minutes.
Explanation :
First we have to convert the mass of iron oxide from milligram to pounds (lbs).
[tex]1\text{ lbs}=453592mg[/tex]
or,
[tex]1mg=\frac{1}{453592}\text{ lbs}[/tex]
As, [tex]1mg=\frac{1}{453592}\text{ lbs}[/tex]
So, [tex]500mg=\frac{500mg}{1mg}\times \frac{1}{453592}\text{ lbs}=0.0011\text{ lbs}[/tex]
Now we have to calculate the time taken for the reaction.
As, [tex]0.0011\text{ lbs}[/tex] of iron oxide take time = 20 minutes
As, [tex]2\text{ lbs}[/tex] of iron oxide take time = [tex]\frac{2\text{ lbs}}{0.0011\text{ lbs}}\times 20\text{ minutes}=36363.64\text{ minutes}[/tex]
Therefore, the time taken for the reaction is 36363.64 minutes.
value:
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Enter your answer in the provided bor.
Calculate the height of a column of ethylene glycol (CH(OH)CH(OH)) that would be supported by
atmospheric pressure. The density of ethylene glycol is 1.112 g/cm
Answer:
[tex]\boxed{\text{9.170 m}}[/tex]
Explanation:
The pressure p exerted by a column of liquid is given by the formula
p = hρg
where
h = height of column
ρ = density of liquid
g = acceleration due to gravity
Data:
p = 1 bar = 100 kPa = 10⁵ N·m⁻² = 10⁵ kg·m⁻¹s⁻²
ρ = 1.112 g·cm⁻³ = 1112 kg·m⁻³
g = 9.807 m·s⁻²
Calculation:
10⁵ = h × 1112 × 9.807
10⁵ = 1.091 × 10⁴ h
h = 9.170 m
[tex]\text{The height of a column of ethylene glycol that would be supported by an}\\\\\text{atmospheric pressure of 1 bar is }\boxed{\textbf{9.170 m}}[/tex]
A 1.50-liter sample of dry air in a cylinder exerts a pressure of 3.0 atmospheres at a temperature of 25°C. Without change in temperature, a piston is moved in the cylinder until the pressure in the cylinder is reduced to 1.0 atmosphere. What is the volume of the gas? (Be sure to use the correct number of significant figures.) 0.22 L 0.50 L 2.0 L 4.5 L
Answer:
4.5 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have different values of P and V:(P₁V₁) = (P₂V₂)
Knowing that:
P₁ = 3.0 atm, V₁ = 1.5 L,
P₂ = 1.0 atm, V₂ = ??? L.
Applying in the above equation(P₁V₁) = (P₂V₂)
∴ V₂ = (P₁V₁)/P₂ = (1.5 L)(3.0 atm)/(1.0 atm) = 4.5 L.
So, the right choice is: 4.5 L.
Answer:
4.5 L.
Explanation:
Which substance produces hydroxide ions in solution?
O A.
an Arrhenius acid
OB. an Arrhenius base
O c.
a Brønsted-Lowry acid
0
OD. a Brønsted-Lowry base
O E.
0
an amphoteric substance
Answer:
An Arrhenius Base
Explanation:
The definition of this is a base that is a hydroxide ion donor.
A base is a substance that produces hydroxide ions in solutions.
A base that produces hydroxide ions in aqueous solution is also known as: A. Arrhenius bases
An Arrhenius base is a compound that increases the OH− ion concentration in aqueous solution. The reaction between an Arrhenius acid and an Arrhenius base is called neutralization and results in the formation of water and a salt.
What is Arrhenius base give example?An Arrhenius base is a substrate that increases the concentration of hydroxide ions in the aqueous solution. The example for Arrhenius base is highly soluble sodium hydroxide compound in water, which dissociates to give sodium ion and hydroxide ion.
What are examples of Arrhenius acids and bases?Other examples of Arrhenius acids include sulfuric acid (H2SO4), hydrobromic acid (HBr), and nitric acid (HNO3). Examples of Arrhenius bases include sodium hydroxide (NaOH) and potassium hydroxide (KOH).
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The ions Ca2+ and PO43- form salt with the formula
Ca3(PO4)2 is the answer.
Answer : The formula for the compound is [tex]Ca_3(PO_4)_2[/tex]
Explanation :
For formation of a neutral ionic compound, the charges on cation and anion must be balanced.
The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non-metals.
In the given question, the calcium metal forms an ionic compound with polyatomic anion (phosphate) [tex]PO_4^{3-}[/tex].
Here, calcium is having an oxidation state of +2 called as [tex]Ca^{2+}[/tex] cation and phosphate [tex]PO_4^{3-}[/tex] is an anion with oxidation state of -3. The charges are not balanced. So, the charges are balanced by the cris-cross method. Thus, the compound formed will be, [tex]Ca_3(PO_4)_2[/tex]
Hence, the formula for the compound is [tex]Ca_3(PO_4)_2[/tex]
How many miles of beryllium chloride BeCl2 are needed to make 130 ml of a 0.025 M solution
Answer:
= 0.00325 moles of beryllium
Explanation:
Molarity or concentration is given by the formula;
Molarity = Number of moles/Volume in L
Therefore, to get the number of moles
Moles = Molarity × Volume
= 0.025 M × 0.13 L
= 0.00325 moles of beryllium
A scientist observes debris added to a landform from a melting glacier. This is evidence for which type of natural process?
A: Physical weathering
B: Chemical Weathering
C: Erosion
Or D: Deposition
Answer:
i would say deposition
How many grams of potassium chloride are there in 1445.71 mL of 2.47 M KCI?
Answer:
266.2 g.
Explanation:
Molarity is the no. of moles of solute per 1.0 L of the solution.M = (no. of moles of KCl)/(Volume of the solution (L))
M = 2.47 M.
no. of moles of KCl = ??? mol,
Volume of the solution = 1445.71 mL = 1.44571 L.
∴ (2.47 M) = (no. of moles of KCl)/(1.44571 L)
∴ (no. of moles of KCl) = (2.47 M)*(1.44571 L) = 3.571 mol.
To find the mass of KCl, we can use the relation:no. of moles of KCl = mass/molar mass
∴ mass of KCl = (no. of moles of KCl)*(molar mass) = (3.571 mol)*(74.55 g/mol) = 266.2 g.
Giving brainliest to correct answer!
What kind of energy does hot water have?
Answer: Thermal Energy
Explanation:
Answer:
Hot water has kinetic energy
Explanation:
That is an energy that involves movement. Kinetic energy water causes flows and make waves exist
what happens to the atomic number of an atom as you go across a period of the periodic table from left to right
Answer:
[tex]\boxed{\text{The atomic number increases}}[/tex]
Explanation:
That's because each time you move one atom to the right, you add a proton to the nucleus, and the atomic number is the number of protons in the nucleus.
Calculate the number of moles of methane (CH4)needed to produce 7.84 g of water (H2O).
Answer:
0.218 mol.
Explanation:
Firstly, we need to write the balanced reaction:CH₄ + 2O₂ → CO₂ + 2H₂O,
It is clear that 1 mol of CH₄ reacts with 2 mol of O₂ to produce 1 mol of CO₂ and 2 mol of H₂O.
We need to calculate the no. of moles of 7.84 g H₂O:n = mass/molar mass = (7.84 g)/(18.0 g/mol) = 0.436 mol.
Using cross multiplication:
1 mol of CH₄ is needed to produce → 2 mol of H₂O, from stichiometry.
??? mol of CH₄ is needed to produce → 0.436 mol of H₂O.
∴ The no. of moles of CH₄ = (1 mol)(0.435 mol)/(2 mol) = 0.218 mol.
What is the name of this molecule?
Answer:
The answer to this question is heptane.
Explanation:
The name of the molecule will be 6-ethyl octan-2-ene.
What is 6-ethyl octan-2-ene?6-ethyl octan-2-ene is kind of organic molecule in which 8 carbon atom is exit. At C-6 carbon ethyl group is attached.
What is molecule?A molecule would be a collection of two and more components bound atoms, whether they are from an identical element or another.
It can be seen that the longest chain of the molecule is C-8 and at C-2 carbon atom double bond is present . So it can be named as octan-2-ene . Due to the attachment of ethyl group with C-6 carbon atom it will be name as 6-ethyl octan-2-ene
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14. Which of the following is an example of an epeirogenic process?
O
O A. A rift valley forms at a divergent boundary where two plates are stretched apart.
B. A large plateau forms in the interior of a continental plate when a large section of the plate rises evenly due to an even expansion of the underlying mantle
O C. Mountains form along a convergent plate boundary when two plates collide, causing rock to bunch and buckle upward
O D. Mountains form along a convergent plate boundary when an oceanic plate slips beneath a continental plate, resulting in an upward force on the continental plate
Answer:
A large plateau forms in the interior of a continental plate when a large section of the plate rises evenly due to an even expansion of the underlying mantle. B.
Answer: Option (A) and (D)
Explanation: Epeirogenic process refers to the uplifting and sinking of the continental crust. It is the vertical movement of the crust due to certain mechanisms. Divergent movement of the plates leads to the thinning of the crust and in the convergent plate boundary between a continent and oceanic plate, creates an accretionary wedge that increases the vertical height of the crust. It is not related to the continental collision and plateaus are the stable part of the continent where there is not much change in the thickness of the crust.
Thus the correct answers are (A) and (D)
___solutions are good conductors of electricity.
lonic
Covalent
Heterogeneous
Gaseous
The answer is ionic
Answer: Option (a) is the correct answer.
Explanation:
A bond where transfer of electrons take place from one atom to another is known as an ionic bond.
An ionic solution is defined as a solution in which an ionic compound is dissociated into ions.
For example, NaCl is an ionic compound and when it is dissolved in water it dissociates as [tex]Na^{+}[/tex] and [tex]Cl^{-}[/tex] ions.
As it is known that electric current is the flow of charges. Hence, a solution that contains ions will be a good conductor of electricity.
Whereas in general, a covalent solution does not contain any ions.
Thus, we can conclude that ionic solutions are good conductors of electricity.
Think of three ways you could safely distinguish between a strong acid and a strong base.
Answer:
--Acid is the substance when dissolved in water, increases the concentration of H+ ions.
--Such compound whose chemical formula begins with H, for example HCl (Hydrochloric acid), H3BO3 (Boric acid), CH2O3 (Carbonic
acid). Although CH3COOH (Acetic acid) is an exception.
--Its less than 7.
--Bases are the proton acceptor.
--Such compounds whose chemical formula ends with OH, for example KOH (Potassium hydroxide), NaOH (Sodium hydroxide).
--Its greater than 7.
Explanation:
One can distinguish between a strong acid and a strong base by using pH paper or a pH meter, observing the reaction in a neutralization process with known substances, and testing the conductivity of the solutions.
Explanation:To distinguish between a strong acid and a strong base, one can use the following three safe methods:
Use pH paper or a pH meter. A strong acid will turn the pH paper red, indicating a pH close to 1-3, while a strong base will turn the paper blue or purple, indicating a pH close to 11-14.Use a neutralization reaction with a known substance. A strong acid will react vigorously with a known strong base, and vice versa, producing water and a salt.Use conductivity testing. Strong acids and bases will both conduct electricity well in solution due to the high concentration of ions, however, by comparing to known standards, one can differentiate between them.It's important to handle all strong acids and bases with proper safety equipment and procedures due to their corrosive nature.
O
Use the periodic table to determine which of the
following could be an isotope of bromine (Br).
Check all that apply.
Z = 79, A = 196
O Z= 35, A= 79
A= 79, N= 44
Z = 44, N= 44
O
DONE
Intro
Answer:
The second and third option are isotopes of Bromine
Z= 35 A = 79
A = 79 N= 44
Explanation:
Step 1: What are isotopes ?
⇒ Elements with same atomic number (Z) ( this means the same number of electrons and protons) but a different number of neutrons (N)
The atomic number (visible on the periodic table) is the number of protons.
The atomic mass is the sum of the protons (Z) and neutrons (N), and is showed as 'A'. So A = Z+N
If we look at the periodic table, we can see that the atomic number of bromine (Z) = 35. This means the amount of protons = 35. Since isotopes have the same amount of protons, all isotopes of bromine, have 35 protons.
1) Z = 79, A = 196
Z = protons = electrons .So this element has 79 protons, as well as 79 electrons.
196 = 79 + N ⇒ N = 196 - 79 = 117 neutrons
⇒Since it doesn't have 35 protons, it isn't an isotope of Bromine, but of Gold (Au): 196Au
2) Z = 35 , A = 79
Z = protons = electrons .So this element has 35 protons, as well as 35 electrons.
79 =35 + N ⇒ N = 79 - 35= 44 neutrons
⇒Since it does have 35 protons, it is an isotope of Bromine. This isotope has 44 neutrons
⇒ This is 79Br, which is a stable isotope of Bromine.
3) A=79, N = 44
Z = A - N ⇒ Z = 79 - 44 = 35
Z = protons = electrons .So this element has 35 protons, as well as 35 electrons. It also has 44 neutrons.
⇒Since it does have 35 protons, it is an isotope of Bromine, with 44 neutrons: 79Br
4) Z = 44, N = 44
Z = protons = electrons .So this element has 44 protons, as well as 44 electrons.
A = 44 + 44 ⇒ A = 88
⇒Since it doesn't have 35 protons, it isn't an isotope of Bromine, but of Ruthenium (Ru) : 88Ru
⇔So the second and third option are isotopes of Bromine
How to make slime without glue or cornstarch
Hopefully this is close to what you looking for
One way :
-Dawn soap
-some water
-Salt crystals
-Put in freezer for a few hours
-StarGaze
(if this doesn't work comment)
I suggest using a little bit first, to see if it works for you.
if two atoms are isotopes of the same element, they have the same number of ______ but will have different numbers of ____
A: protons; neutrons
B: neutrons; electrons
C: neutrons; protons
Answer:
A.
Explanation:
if it's the same element the protons will always be the same, but have different neutrons, and neutrons is made up of protons and atomic mass, which atomic mass numbers can be calculated different where in return gives different numbers of neutrons.
EX: say the element is carbon, carbon has 6 protons and that won't change, but carbon can have an atomic mass of 12, 13, or 14, etc. so when you make up the neutrons you add protons and atomic mass, 6 + 12 = 18 N
6 + 13 = 19 N
6 + 14 = 20 N
Isotopes of a given element have the same number of protons but vary in the number of neutrons. Therefore, option A: protons; neutrons is correct.
Explanation:If two atoms are isotopes of the same element, they will have the same number of protons, but will have different numbers of neutrons. This is because all isotopes of an element will contain the same number of protons, which determines the atomic number and thus the identity of the element. However, isotopes differ in the number of neutrons in their atomic nuclei, which leads to differing atomic masses. Hence, the correct choice is A: protons; neutrons.
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2. A solution is made by adding 1.23 mol of KCl to 1000.0 g of water. Assume that the
density of water (and the resulting solution) is 1.00 g/mL.
a. Calculate the formula weight of KCl.
b. Calculate the mass of KCl in grams.
c. Calculate the percent by mass of KCl in this solution.
d. Calculate the molarity of the solution.
Answer:
a. 74.55 g/mol.
b. 91.70 g.
c. 8.40%.
d. 1.23 mol/L.
Explanation:
a. Calculate the formula weight of KCl.
∵ Formula weight of KCl = atomic weight of K + atomic weight of Cl
atomic weight of K = 39.098 g/mol, atomic weight of Cl = 35.45 g/mol.
∴ Formula weight of KCl = atomic weight of K + atomic weight of Cl = 39.098 g/mol + 35.45 g/mol = 74.548 g/mol ≅ 74.55 g/mol.
b. Calculate the mass of KCl in grams.
we can use the relation:no. of moles (n) = mass/molar mass.
∴ mass of KCl = n*molar mass = (1.23 mol)*(74.55 g/mol) = 91.69 g ≅ 91.70 g.
c. Calculate the percent by mass of KCl in this solution.
The mass % of KCl = (mass of KCl/mass of the solution) * 100.
mass of KCl = 91.70 g,
mass of the solution = 1000.0 g of water + 91.70 g of KCl = 1091.70 g.
∴ The mass % of KCl = (91.70 g/1091.70 g)*100 = 8.399% ≅ 8.40%.
d. Calculate the molarity of the solution.
Molarity is the no. of moles of solute per 1.0 L of the solution.
M = (no. of moles of KCl)/(Volume of the solution (L))
no. of moles of KCl = 1.23 mol,
Volume of the solution = mass of water / density of water = (1000.0 g)/(1.00 g/mL) = 1000.0 mL = 1.0 L.
M = (1.23 mol)/(1.0 L) = 1.23 mol/L.
a. The formula weight of KCl is 74.55 g/mol. b. The mass of KCl in grams is 91.39 g. c. The percent by mass of KCl in the solution is 9.14%. d. The molarity of the solution is 1.23 M.
Explanation:a. The formula weight of KCl (potassium chloride) can be calculated by summing the atomic masses of potassium (K) and chlorine (Cl). The atomic mass of K is 39.10 g/mol and the atomic mass of Cl is 35.45 g/mol. Therefore, the formula weight of KCl is 39.10 g/mol + 35.45 g/mol = 74.55 g/mol.
b. To calculate the mass of KCl in the solution, we need to convert the given amount of KCl in moles to grams. Since 1 mole of KCl has a mass of 74.55 g (as calculated in part a), 1.23 mol of KCl will have a mass of 1.23 mol x 74.55 g/mol = 91.39 g.
c. The percent by mass of KCl in the solution can be calculated by dividing the mass of KCl (91.39 g, as calculated in part b) by the mass of the solution and multiplying by 100%. The mass of the solution is given as 1000.0 g. Therefore, the percent by mass of KCl in the solution is (91.39 g / 1000.0 g) x 100% = 9.14%.
d. The molarity of the solution can be calculated by dividing the number of moles of KCl by the volume of the solution in liters. The number of moles of KCl is given as 1.23 mol and the volume of the solution is 1000.0 g of water, which is equivalent to 1000.0 mL or 1.0000 L. Therefore, the molarity of the solution is 1.23 mol / 1.0000 L = 1.23 M.
Select all the correct answers.
An uncovered pot of water lies out in the sun. Which statements correctly describe what happens at the surface of the liquid water?
The vapor pressure remains constant regardless of the water temperature.
The vapor pressure is produced by water molecules that have evaporated.
The vapor pressure increases as the Sun heats the water in the pot.
Evaporation stops once the vapor pressure reaches a certain point.
Evaporation and condensation both occur on the liquid’s surface.
Answer:
I believe two correct statements are;
The vapor pressure is produced by water molecules that have evaporated.
The vapor pressure increases as the Sun heats the water in the pot.
Explanation:
When an uncovered pot of water lies out in the sun then the vapor pressure is produced by water molecules that have evaporated and increases as the Sun heats.
What is vapor pressure?Vapor pressure is a property of the substance which may change into gaseous state.
When an uncovered pot of water lies out in the sun, then the vapor pressure is produced by the water molecules of the surface phase and they get evaporated. And due to heat transfer by the sun in the form of sunlight vapor pressure of water also increases, which results into more evaporation.
Hence, option (2) and (3) is correct it means vapor pressure increases as the sun heats the water in the pot and they get evaporated.
To know more about vapor pressure, visit the below link:
https://brainly.com/question/25863019
A compressor takes 0.50 m3 of a gas at 33°C and 760 mmHg and compresses it to 0.10 m3, cooling it to -55°C at the same time. What is the pressure of the gas at these new conditions? 3.7 x 10-4 mmHg 68 mmHg 2,700 mmHg 1.0 mmHg
Answer:
2,700 mmHg.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n is constant, and have two different values of V, P and T:P₁V₁T₂ = P₂V₂T₁
P₁ = 760 mmHg, V₁ = 0.50 m³, T₁ = 33°C + 273 = 306.0 K.
P₂ = ??? mmHg, V₂ = 0.10 m³, T₂ = - 55°C + 273 = 218.0 K.
∴ P₂ = P₁V₁T₂/V₂T₁ = (760 mmHg)(0.50 m³)(218.0 K)/(0.10 m³)(306.0 K) = 2707.0 mmHg ≅ 2,700 mmHg.
Answer:
2,700 mmHg.
Explanation: