Answer:
B. The dilute solution contains less solute than the concentrated solution.
Explanation:
A diluted solution is a solution that has less solute (what is being dissolved) dissolved in the solvent (what is dissolving). A concentrated solution is the opposite, it has more solute than dissolved by the solvent.
A simple example is when you make iced tea (with powder). If you want a strong taste, you add more iced tea powder (solute) to the water (solvent) so it is more concentrated. If you want less, you add more water to dilute it.
What is the morality of 2.50 L of solution that contains 1.85 mol of anhydrous sodium tetraborate?
The morality, or molarity, of a 2.50 L solution containing 1.85 mol of anhydrous sodium tetraborate is calculated by dividing the amount of solute by the volume, yielding a concentration of 0.74 M.
The morality of a 2.50 L solution containing 1.85 mol of anhydrous sodium tetraborate refers to its molar concentration, which is expressed in moles per liter (mol/L). To find the morality, also known as molarity, you would divide the number of moles of solute by the volume of the solution in liters.
Molarity (M) = moles of solute / volume of solution in liters
Therefore, the molarity of the sodium tetraborate solution is:
M = 1.85 mol / 2.50 L
M = 0.74 M
What is enthalpy? the total concentration of the system the total heat content of the system the total pressure of the system the total internal energy of the system
Answer:
The total heat content of the system.
Explanation:
Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system.Enthalpy is equal to the system's internal energy plus the product of its pressure and volume. In a system enclosed so as to prevent matter transfer, for processes at constant pressure, the heat absorbed or released equals the change in enthalpy.So, the right choice is: The total heat content of the system.
The Δ symbol in a chemical equation means _____.
Answer:
heat is supplied to the reaction
Answer:
The Δ symbol in a chemical equation means energy in form of heat is provided to the system.
Explanation:
When the Δ symbol is above or under the arrow of a chemical reaction representation it is indicating that the reagents must be heated to obtain the products. i.e. is representing an endothermic reaction in which energy must be provided to the system for the reaction to occur.
An object was measured by a worker as
14.6cm long, however, the manufacturer
specifications list the length of the object at
14.4cm. What is the percent error in the
worker's measurement?
The percent error in the worker's measurement, when compared to the manufacturer's specifications, is 1.39%.
To calculate the percent error in the worker's measurement, we need to compare the measured value to the accepted value given by the manufacturer's specifications. The formula to determine percent error is:
[tex]Percent\ Error = |\frac{Measured\ Value\ -\ True\ Value}{True\ Value}| \times 100\%[/tex]
In this case:
Measured Value = 14.6 cmTrue Value = 14.4 cmApplying the values to the formula, we get:
[tex]Percent\ Error = |\frac{14.6 cm - 14.4 cm}{14.4 cm}| \times 100\% = |\frac{0.2 cm}{14.4 cm}| \times 100\% = 0.0139 \times 100\% \\ = 1.39\%[/tex]
Therefore, the percent error in the worker's measurement is 1.39%.
During which months do both the northern and Southern Hemisphere receive the same amount of energy from the sun
Answer:b
Explanation:
Answer:
March and September
Explanation:
During equinox, which occurs every year approximately on 21st March and on 22nd September, the day length and the night length are both 12 hours. This happens because the sun is directly overhead the equator. As a consequence both Hemispheres receives the same amount of energy from the Sun.
Which of these discoveries contradict components of Dalton’s atomic theory? Check all of the boxes that apply.
Atoms contain smaller particles: protons, neutrons, and electrons.
Atoms of a given element can bond to other atoms only in specific ways.
Atoms of a given element can have different numbers of neutrons.
Nuclear reactions can change an atom of one element into an atom of another element.
All atoms of a given element have the same number of protons.
Answers:
Nuclear reactions can change an atom of one element into an atom of another element. ( fourth choice)
Atoms contain smaller particles: protons, neutrons, and electrons.( first choice)
Atoms of a given element can have different numbers of neutrons.( third choice)
Answer:
Atoms contain smaller particles: protons, neutrons, and electrons.
Atoms of a given element can have different numbers of neutrons.
Nuclear reactions can change an atom of one element into an atom of another element.
All atoms of a given element have the same number of protons.
Explanation:
Electrons, protons, and neutrons, and isotopes had not yet been discovered.
The only statement that agrees with Dalton's atomic theory is
B. Atoms of a given element can bond to other atoms only in specific ways. Dalton used this postulate to formulate the Laws of Definite Composition and of Multiple Proportions.
Both amines and amides are derivatives of ammonia. True False
It is true that both amides and amine are the derivatives of ammonia.
Explanation:Amines are the derivatives of ammonia [tex]\text{(NH_3)}[/tex] where nitrogen atom makes bond to 1, 2, or 3 alkyl or aromatic groups of compounds. Amides are the amino group [tex]\text{(-NH_2)}[/tex], which is derived from ammonia, replaces the hydroxyl group [tex]\text{(-OH)}[/tex] in a carboxylic acid.
The simplest amides are the proper derivation of ammonia whereas the higher degree amides are the derivation of secondary amine.
The statement is correct. Amines and amides are in fact derivatives of ammonia. Amines are derived from ammonia by replacing hydrogen atoms by alkyl or aryl groups, while amides are derived by replacing one hydrogen with an acyl group.
Explanation:Yes, the statement is correct. Amines and amides are indeed derivatives of ammonia.
Amines are organic compounds which are derived from ammonia by replacing one or more hydrogen atoms by alkyl or aryl group. For example, methylamine CH3NH2 is an amine where one hydrogen atom is replaced by a methyl group.
Amides, on the other hand, are organic compounds derived from ammonia by replacing one hydrogen atom by an acyl group. An example of an amide is acetamide CH3CONH2 where one hydrogen atom of ammonia is replaced by an acetyl group.
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how many molecules of water are in 345g
Answer:
1.15 molecules
Explanation:
To get to molecules, you need to first convert grams into moles, then moles into molecules.
345g of water x [tex]\frac{1 mol }{18.02g}[/tex]
This will get you the moles of water. (The number 18.02 came form the molar mass of water which is H2O)
I MOLE EQUALS AVOGADRO'S NUMBER
19.15 mol of water x[tex]\frac{6.022*10^{23}molecules }{1 mol}[/tex]
= 1.15
Answer:
There are [tex]1.1542\times 10^{25} [/tex] molecules of water are in 345 grams.
Explanation:
[tex]n=\frac{m}{M}[/tex]
[tex]N=n\times N_A[/tex]
Where:
m = mass of compound
M = Molar mass of compound
N = Number of particles / atoms/ molecules
n = Number of moles
[tex]N_A=6.022\times 10^{23} mol^{-1}[/tex] = Avogadro's number
Mass of water = m = 345 g
Molar mas of water = M = 18 g/mol
[tex]n=\frac{345 g}{18 g/mol}=19.167 mol[/tex]
Number of molecules of water = N
[tex]N=19.167 mol\times 6.022\times 10^{23}mol^{-1}[/tex]
[tex]N = 1.1542\times 10^{25} molecules[/tex]
There are [tex]1.1542\times 10^{25} [/tex] molecules of water are in 345 grams.
define molecules as it relates to molecular substances and compounds
Answer:
molecules are 2 atoms held together by chemical bonds, compunds are 2 atoms from more than one element held together by chemical bonds.
Molecule is the combination of two or more different atoms and Group of similar molecules forms compound.
What are the properties of a Molecule ?
Molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
A molecule is the smallest particle into which an element or a compound can be divided without changing its chemical and physical properties.
Therefore, Molecule is the combination of two or more different atoms and Group of similar molecules forms compound.
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why is radioactive dating important when approximating the age of earth?
Answer:
So, we rely on radiometric dating to calculate their ages. Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.
Explanation:
radiometric dating is a very accurate way to date the Earth.We know it is accurate because radiometric dating is based on the radioactive decay of unstable isotopes. When an unstable Uranium (U) isotope decays, it turns into an isotope of the element Lead (Pb).
Answer:
The radioactive dating method is one of the efficiently used methods in order to calculate the age of the rocks, meteorites, fossils and various other objects, depending upon the rate at which radioactive isotopes decay. In this method, an unstable element changes into a stable one, releasing some amount of radiation and losing a certain amount of energy.
This is efficient in determining the age of the earth. The earth is comprised of rocks that are present from the time of its formation. These rocks can be dated using this method and the approximate age of the rock is evaluated.
The Uranium-Lead dating (²³⁸U-²⁰⁶Pb) method was used to date the smaller zircon crystals of Australia that are about 4.4 billion years old. The half-life of U-238 is approximately 4.5 billion years, which shows that these are one of the oldest rocks on earth and helps in understanding how old the earth is.
Half-life is defined as the time required by a radioactive isotope to decay half of its atoms.
So the radioactive dating method is one of the common method gives the approximate age of the earth.
WILL GIVE BRAINLIEST TO THE FIRST CORRECT ANSWER! UWU
Which of the following is an element???
Answer:
B) C2
Explanation:
C2 is oxygen and oxygen is an element :)
Answer:
A is water
B is an oxygen molecule
C is an organic compound
The answer is B
Which of the following are characteristics of atoms and molecules in the gaseous state?
1. They expand as the temperature is increased.
II. They are compressible.
III. They have high densities.
IV. They are miscible.
e. I, II, and IV
a. I and II
b. I, II, and III
C. I and IV
d. I and III
I and III are characteristics of atoms and molecules in the gaseous state.
Hence, option D is correct.
What is an atom?An atom is any particle of matter which contains at least one proton.
The gas expands as the temperature increases and has high densities.
The temperature of a gas will increase and the density will decrease as it
expands.
The expansion of gas occurs as a result of an increase in the elastic
collision of the atoms.
This is a result of the increase in temperature which causes the atoms to be more spatially arranged.
The density of gas also reduces as a result of the same number of gas
molecules occupying more volume.
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Final answer:
Gasses expand as temperature increases, are compressible, and are miscible, but do not have high densities. The answer to the characteristics of gaseous atoms and molecules is e. I, II, and IV.
Explanation:
Atoms and molecules in the gaseous state exhibit several characteristic properties. Firstly, they expand as the temperature is increased. This expansion is due to the increased kinetic energy of the gas particles, causing them to move further apart. Secondly, gases are indeed compressible because of the large amount of space between the gas particles, which can be reduced under pressure. However, they do not have high densities; gases are much less dense than solids or liquids. Finally, gases are miscible, meaning they can mix together to form a homogeneous mixture, like air, which is a mixture primarily of nitrogen and oxygen.
Taking these points into consideration, the correct answer to the student's question about the characteristics of atoms and molecules in gases would be options I (They expand as the temperature is increased), II (They are compressible), and IV (They are miscible). Therefore, the answer is e. I, II, and IV.
A student will measure and record the growth of two flowering plants every day for 28 days. Plant A will be watered and fertilized, Plant B will only be watered. The student predicts fertilizer added to the soil leads to taller flowering plants. Scientific conclusions are based on scientific evidence, what evidence would support the student’s prediction?
Answer:
If Plant A grows taller than Plant B
Explanation:
because plant A is being fertilized whereas plant B isn't
The density of iron is 7.8 g/cm3 and that of aluminum is 2.7 g/cm3. Using a balance, you find that a block of iron has the same mass as a block of aluminum. Which block has the LARGER volume?
Question 15 options:
You cannot tell from the information given.
The volumes are the same.
The iron block
The aluminum block
2.) As water in an ice cube tray freezes,
Question 23 options:
it absorbs energy from its surroundings.
its surroundings absorb energy from it.
it absorbs coldness from and releases energy to its surroundings.
it only absorbs the coldness from its surroundings.
it neither absorbs nor releases energy, because its temperature stays constant.
Answer:
1.The Aluminum block
2.its surroundings absorb energy from it.
Explanation:
In this question it is important to remember that density of an object is the mass of that object divided by its volume.
The expression applied here is density=mass/volume
Given that the mass is constant,lets say mass= m=1g
and density of aluminum=2.7g/cm³ and that of iron is 7.8 g/cm³ then volume=?
Volume=mass/density
Volume of aluminum= 1/2.7 =0.3704 cm³
Volume of iron = 1/7.8 =0.1282 cm³
Here we see volume of Aluminum block is the largest.
2.As water in an ice cube tray freezes, its surroundings absorb energy from it.When the water freezes, latent heat of freezing is given out to the surrounding.When water is freezing, it stays at a constant temperature of 0°C, the heat energy released ensures that there is no cooling past 0 °C.
Which of the following fossils are trace fossils?
Trace fossils may consist of impressions made on or in the substrate by an organism: for example, burrows, borings, footprints and feeding marks, and root cavities. Trace fossils contrast with body fossils, which are the fossilized remains of parts of organisms' bodies, usually altered by later chemical activity or mineralization.
Hope this helps! :D
Answer:
footprint
Explanation:
I know you can choose more than one anwer but that it is the only answer that makes sense
If a stack of 1,008 alkali fuel cells in series generates 14,800 W of power, and each cell contributes equally to the power of the stack, how much power does each cell contribute? (Write the answer to one decimal place.)
Answer:
I got 14.7 W each
14,800 divided by 1,008 is 14.682539 which is 14.7 to 1dp. Sorry if this is wrong.
Answer: 14.7
Explanation: I got it correct.
Which kind of weather usually forms over the northwest United States in the summer because of maritime polar air masses?
1 )fog
2)dry heat
3) heavy snow
4) heavy rain
Answer:
1 )foggy.
Explanation:
As air mass is a large body of air that remains stable over the area for a larger period like days or weeks it produces heat exchange on land and as well on waters. As maritime polar air masses (M.P) are cool and moist hence they bring cloudy and damp weather to the USA covering the northern Atlantic and Northern Pacific oceans, mostly influenced by the pacific northwest and northeast air masses. They can form any time of the year and are not as cold as the continental polar air masses.
Element
Mass Number
Atomic Number
Aluminum
27
13
Nitrogen
14
7
Helium
4
2
Fluorine
19
9
Which element has the most neutrons in the nucleus?
Aluminum
Nitrogen
Helium
Fluorine
Answer:
Aluminum
Explanation:
An atom of any elements has an outer electron and a proton and neutron located in the nucleus . The proton and neutron found in the nucleus of an atom determine the mass number of an element. The mass number of an element is the sum of the proton(atomic number) and the neutron number.
Mathematically,
Mass number = proton number(atomic number) + neutron number
Therefore,
neutrons number = mass number - proton number
Aluminium has the highest neutron
neutron = 27 - 13 = 14
Neutron of aluminium = 14
Final answer:
Aluminum, with a mass number of 27 and an atomic number of 13, has the most neutrons in its nucleus among the given elements, totaling 14 neutrons.
Explanation:
To determine which element has the most neutrons in its nucleus, we need to subtract the atomic number from the mass number for each element. The atomic number represents the number of protons, and the mass number is the sum of protons and neutrons in the nucleus.
Aluminum has a mass number of 27 and an atomic number of 13, resulting in 27 - 13 = 14 neutrons.
Nitrogen has a mass number of 14 and an atomic number of 7, resulting in 14 - 7 = 7 neutrons.
Helium has a mass number of 4 and an atomic number of 2, resulting in 4 - 2 = 2 neutrons.
Fluorine has a mass number of 19 and an atomic number of 9, resulting in 19 - 9 = 10 neutrons.
Comparing the number of neutrons calculated for each element, we can see that Aluminum has the most neutrons in its nucleus.
Complete the paragraph to describe the characteristics of a silicon tetrahydride molecule (SiH4). The Lewis structure and table of electronegativities are given.
The bond polarities of SiH4 are , the molecular shape is , and the molecule is .
Answer:
PLATO: Polar, Tetrahedral, NonPolar
Explanation:
Write the balanced
chemical equation for the reaction. If a plant has 88.0 g carbon diox-
ide and 64.0 g water available for photosynthesis, determine
a. the limiting reactant.
b. the excess reactant and the mass in excess.
c. the mass of glucose produced.
The balanced chemical equation for photosynthesis is 6CO2(g) + 6H2O(l) → C6H12O6(s) + 6O2(g), with water being the limiting reactant and carbon dioxide in excess. The mass of excess CO2 and the mass of glucose produced is determined by stoichiometric calculations.
Explanation:The balanced chemical equation for photosynthesis is 6CO2(g) + 6H2O(l) → C6H12O6(s) + 6O2(g). This shows that carbon dioxide (CO2) and water (H2O) react to form glucose (C6H12O6) and oxygen (O2). To find the limiting reactant, you convert the masses given for CO2 and H2O to moles using their respective molar masses (44.01 g/mol for CO2 and 18.02 g/mol for H2O). You would find that water is the limiting reactant because there are fewer moles of H2O than CO2 when compared to the stoichiometric coefficients in the balanced equation.
To find the excess reactant, subtract the amount of CO2 that would react with the available H2O from the initial amount of CO2 to determine the mass in excess. For the mass of glucose produced, use the mole ratio from the balanced equation, multiplied by the number of moles of the limiting reactant and then by the molar mass of glucose (180.16 g/mol).
How many moles of HCI would be required to produce a total of 2 moles of H2
Answer:
Should be 4 moles.
How many grams of aluminum will there be in 98g of Al2O3?
Answer:
51.88 grams
Explanation:
make it in ratio form
Al=27×2=54.
54:48
(54/102)×98
=51.88 grams
O=16×3=48
(48/102)×98
=46.12 grams
3. How many electrons are present in 1.6 g of methane?
Answer:
They present 1 electron
Chemical reaction to distinguish 1 butyne and 2 butyne
Answer:
1-butyne and 2-Butyne are distinguished by : -
"Tollins reagent test ".
1-butyne gives tollins reagent test but 2-Butyne doesn't.
Explanation:
You can Refer to attachment.
Transportation is the largest single source of air pollution in the United States. Air pollution can harm the environment and human health. Which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage
Answer:
- motors that run on electricity
- tires that improve gas mileage
Explanation:
The transportation is a major polluter of the air. The big problem with it is that it is necessary for the humans to be able to live and function properly, as the trade is happening through it, thus it is crucial for the economy. In order to stop or reduce the negative impact on the air quality, there are some solutions which can help. The motors that can run on electricity are an excellent method, as the production of electricity is not polluting the are as the fossil fuels are. The only problem is that this type of motors are still very expensive, so once their price is on pair with the combustion motors they can be used. Tires that are able to increase the efficiency of the transportation means can also be useful, as they will be able to reduce the amount of pollutants released into the atmosphere, because the transportation will use less fossil fuels for the same mileage.
Answer:
Explanation:
Under the sector of transportation passenger vehicles are the major contributor to the pollution. Emission from cars and two-wheeler is the leading cause of increasing level of carbon dioxide, sulfur content and other greenhouse gases.
Solution to this problem include:
Increase in usage of electric vehicles as seen in Norway.Better tires which can improve the fuel mileage.Encourage usage of public transport.why are halogens kept in the group 17 of modern peroidic table?
Halogens are in Group 17 of the periodic table because they have seven valence electrons, making them highly reactive as they seek one more electron to achieve a full octet. Their ability to readily form singly negative ions and salts when reacting with metals further characterizes their group placement.
Halogens are kept in Group 17 (also known as Group VIIA) of the modern periodic table because of their distinctive chemical properties. Each halogen has seven valence electrons (a p⁵ configuration in their outermost p subshell), which is just one electron short of completing their outer shell. Thus, they are highly reactive, as they need only one additional electron to achieve a stable, noble gas electron configuration.
The reactivity of halogens also allows them to form singly negative ions, such as Cl-, by accepting an extra electron into the vacancy in their outer p subshell. This contrasts with alkali metals that reside in Group 1, which easily give up their single s electron to form singly positive ions like Na+. Because halogens readily combine with metals to form salts, such as sodium chloride, they are known as "salt-forming" or halogens.
Moreover, the physical states of halogens at room temperature are diverse: chlorine is a gas, bromine is a liquid, and iodine and astatine are solids. This variation doesn't affect their placement in Group 17, which is based on their shared electronic configuration and chemical properties.
When the pressure that a gas exerts
on a sealed container changes from
22.5 psi to_ psi, the
temperature changes from 110°C to
65.9°C.
The answer is:
When the pressure that a gas exerts on a sealed container changes from
22.5 psi to 19.86 psi, the temperature changes from 110°C to
65.9°C.
Why?To calculate which is the last pressure, we need to use Gay-Lussac's law.
The Gay-Lussac's Law states that when the volume is kept constant, the temperature (absolute temperature) and the pressure are proportional.
The Gay-Lussac's equation states that:
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
We are given the following information:
We need to remember that since the temperatures are given in Celsius degrees, we need to convert it to Kelvin (absolute temperature) before use the equation, so:
[tex]P_1=22.5Psi\\T_1=110\°C=110\°C+273.15=383.15K\\T_1=65.9\°C=65\°C+273.15=338.15K[/tex]
Now, calculating we have:
[tex]\frac{P_1}{T_1}*(T_2)=P_2\\\\P_2=\frac{P_1}{T_1}*(T_2)=\frac{22.5Psi}{383.15}*338.15=19.86Psi[/tex]
Hence, the final pressure is equal to 19.86 Psi.
Have a nice day!
Answer:
The final pressure at 65.9°C is 19.91 psi.
Explanation:
To calculate the final pressure of the system, we use the equation given by Gay-Lussac Law.
This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex] (at constant Volume)
where,
[tex]P_1\text{ and }T_1[/tex] are the initial pressure and temperature of the gas.
[tex]P_2\text{ and }T_2[/tex] are the final pressure and temperature of the gas.
We are given:
[tex]P_1=22.5 psi\\T_1=110^oC=383.15 K\\P_2=?\\T_2=65.9^oC=339.05 K[/tex]
Putting values in above equation, we get:
[tex]\frac{22.5 psi}{383.15 K}=\frac{p_2}{339.05 K}[/tex]
[tex]P_2=\frac{22.5 psi}{383.15 K}\times 339.05 K=19.91 psi[/tex]
The final pressure at 65.9°C is 19.91 psi.
How do you identify the anode on a power source such as a battery? How do you identify the cathode? How are terms anion and cation?
Answer:
On a power source such as a battery, the anode is labelled with a + (plus)
The cathode on the other side is labelled with a - (minus)
When ionic compounds ionize, they produce both positive and negative ions.
Anion- This is a negatively charged ion for example chloride ion (Cl⁻)
Cation- This is a positively charged ion for example sodium ion (Na⁺)
If an atom has 12 protons and 13 neutrons
Answer:
MAGNESIUM
Explanation:
The element with the atomic number 12 is magnesium if an atom has 12 protons and 13 neutrons.
What is a proton?A proton is a subatomic particle found in the nucleus of every atom.
The mass number of an isotope is the sum of the protons and neutrons in its atomic nuclei. And it is given that an atom has 12 protons and 13 neutrons. So we need to find out the atomic number of the atom.
If we know the mass number (A) and the number of neutrons (N), we can calculate the atomic number (Z) by subtracting the number of neutrons from the mass number.
A−N=Z
25−13=12
The atomic number of the element is 12.
Atomic number is the number of protons in the nuclei of all atoms of an element.
The element with the atomic number 12 is magnesium.
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The pressure on 7.0 L of gas is increased from 15 psi to 1420 torr, at constant
temperature. What is the new volume of the gas?
Answer:
3.85L
Explanation:
Given parameters:
Initial pressure P₁ = 15psi (1psi = 52mmHg)
converting to mmHg gives (15x52)mmHg = 780mmHg
Initial volume V₁ = 7.0L
Final pressure P₂ = 1420torr= 1420mmHg
Unknown:
Final volume V₂ = ?
Condition of the process: Constant temperature
Solution
To solve this problem, we simply apply Boyle's law. Boyle's law states that "The volume of a given mass of gas varies inversely as the pressure changes, if the temperature is constant".
It is mathematically expressed as ;
P₁V₁ = P₂V₂
The unknown here is V₂ and we simply express it as the subject of the formula:
V₂ = [tex]\frac{P_{1} V_{1} }{P_{2} }[/tex]
V₂ = [tex]\frac{780 x 7 }{1420}[/tex]
V₂ = [tex]\frac{5460}{1420}[/tex] = 3.85L