Calculate the molecular weight when a gas at 25.0 ∘c and 752 mmhg has a density of 1.053 g/l .
A less-intense wave will have fewer _____ than a more-intense wave.
Decibels is the answer for this one.
How is each measurement represented using scientific notation?0.000000655 mL = 6.55 × 10-7 mL 6.55 × 109 mL 655 × 106 mL
Answer : The given number in scientific notation will be, [tex]6.55\times 10^{-7}ml[/tex]
Explanation :
Scientific notation : It is the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.
For example :
90000 is written as [tex]9.0\times 10^4[/tex]
999.9 is written as [tex]9.999\times 10^{-2}[/tex]
As we are given that the number is, 0.000000655 ml
This number is written in scientific notation as :
[tex]6.55\times 10^{-7}ml[/tex]
Hence, the given number in scientific notation will be, [tex]6.55\times 10^{-7}ml[/tex]
Which component is missing from the process of cellular respiration? Glucose + Oxygen → Carbon Dioxide + ________ + Energy
The answer is: Water.
Chemical reaction of cellular respiration (convert biochemical energy):
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O.
glucose + oxygen → carbon dioxide + water + energy .
This reaction is exothermic (energy is released).
Carbon dioxide and water are released during cellular respiration.
In cellular respiration where organic matter is transformed into carbon dioxide and energy is released for production of ATP.
Glucose and oxygen are reactants and carbon dioxide, water and energy are products of this chemical reaction; cellular respiration creates an energy molecule (ATP) when glucose is broken down.
Do states need to be written in a chemical equation
Give the chemical formula and systematic name for aurous sulfide, which is named using the older nomenclature. spelling counts!
Aurous sulfide has the chemical formula Au2S, and in systematic nomenclature, it is named gold(I) sulfide.
Explanation:The chemical formula for aurous sulfide is Au2S. The name aurous sulfide uses the older nomenclature where the suffix '-ous' indicates a lower oxidation state of the metal. In systematic nomenclature, this compound is named gold(I) sulfide. Gold in this compound has a +1 oxidation state. Therefore, the systematic name clearly provides the charge on the gold ion, which is essential for distinguishing between different oxidation states of elements in compounds.
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Complete the chart. (Remember to enter a 0 if necessary.)
Atomic Number: 19
1s:
2s:
2p:
3s:
3p:
4s:
3d:
4p:
5s:
The completed chart atomic number 19 is as below ,
1S 2
2s 2
2p 6
3s 2
3p 6
4s 1
3d 0
4p 0
5s 0
Explanation
According to Aufbau principle in ground state, electrons of atom fill the atomic orbital of lowest energy level before occupying that of higher energy level .
Therefore element in atomic number 19 has 1s2 2s2 2p6 3s2 3p6 4s1 electron configuration .
Which is the highest sublimation point for phosphorus tribromide and water or carbon dioxide?
Under standard atmospheric conditions, water has a higher sublimation point when compared with carbon dioxide; water sublimes from ice to vapor at 0°C, while carbon dioxide sublimes at -78.5°C.
The question is regarding the comparison of the sublimation points of phosphorus tribromide, water, and carbon dioxide. To answer which has the highest sublimation point, let's refer to their respective phase diagrams and critical data. From the information provided:
Water's triple point occurs at 0.01°C and 0.00604 atm or 611 Pa. At pressures lower than this, water directly sublimes from ice to vapor at 0°C.
Carbon dioxide's triple point is at -57.57°C and 5.11 atm. At 1 atm pressure, solid CO₂ sublimes directly to vapor at -78.5°C, its normal sublimation temperature.
Phosphorus tribromide (PBr₃) is not mentioned in the provided data, so we'll leave it out of this comparison.
Water has a much higher sublimation temperature (0°C) compared to carbon dioxide (-78.5°C) under standard atmospheric conditions (1 atm). This indicates that water has a much higher sublimation point than carbon dioxide.
To the nearest gram, what is the mass of one spoonful of sugar? g
The answer is 10 g I just answered it
A typical spoonful of sugar weighs approximately 4 grams when rounded to the nearest gram.
Explanation:The mass of one level spoonful of sugar can slightly vary depending on the size of the spoon but an average teaspoon generally holds around 4 grams of sugar. Measuring by weight is more accurate than volume when it comes to dry ingredients such as sugar. Therefore, when you round to the nearest gram, one spoonful of sugar is approximately 4 grams.
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A 100.0 g sample of water at 27.0°c is poured into a 70.3 g sample of water at 89.0°c. what will be the final temperature of the water?
Answer:
The final temperature of water = 52.6 C
Explanation:
The heat (q) lost or gained by a substance of mass m corresponding to a temperature change from T1 to T2 degrees is given as:
[tex]q = m*c*(T2-T1)[/tex]-----(1)
where c = specific heat of the substance
For water, c = 4.18 J/gC
In the given situation:
Heat lost by 70.3 g of water = Heat gained by 100.0 g of water
Based on equation (1) and considering that heat lost is negative:
[tex]-70.3*c*(T2-89.0)=100.0*c*(T2-27.0)[/tex]
Solving the above equation gives:
T2 = 52.6 C
Consider the reaction mg(s)+fe2+(aq)→mg2+(aq)+fe(s) at 79 ∘c , where [fe2+]= 3.50 m and [mg2+]= 0.310 m . part a what is the value for the reaction quotient, q, for the cell? express your answer numerically.
For the reaction Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s),
when [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient is 0.0886.
Let's consider the following balanced equation.
Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s)
The reaction quotient (Q) is the ratio of the molar concentrations of the product species over those of the reactant species involved in the chemical reaction, taking stoichiometric coefficients of the reaction into account as exponents of the concentrations. It only includes gases and aqueous species.
Given [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient for this cell is:
[tex]Q = \frac{[Mg^{2+} ]}{[Fe^{2+} ]} = \frac{0.310}{3.50} = 0.0886[/tex]
For the reaction Mg(s) + Fe²⁺(aq) → Mg²⁺(aq) + Fe(s),
when [Fe²⁺]= 3.50 M and [Mg²⁺]= 0.310 M, the reaction quotient is 0.0886.
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An electron is a particle with a _____.
negative charge, found in the nucleus
negative charge, found outside the nucleus
positive charge, found in the nucleus
positive charge, found outside the nucleus
Answer: An electron is a particle with a negative charge, found outside the nucleus.
Explanation: In an atom, there is a nucleus in the center that has protons and neutrons. Mostly the mass of an atom is the sum of masses of protons and neutrons. Protons are positively charged ions and neutrons are neutral.
Electrons are present around the nucleus(outside the nucleus) in different energy shells. An electron has negative charge and gain or loss of electrons is the cause of chemical reactions.
Number of protons equals to the atomic number of an atom. Number of electrons is also same to the number of protons for a neutral atom where as the difference of mass number and protons is the number of neutrons.
An electron is a particle with a negative charge, found outside the nucleus and the correct option is option 2.
An electron is a negatively charged subatomic particle that can be either bound to an atom or free (not bound). An electron that is bound to an atom is one of the three primary types of particles within the nucleus of an atom -- the other two are protons and neutrons.
The structure and quantity of electrons in an atom dictate the specific energy levels or orbitals that the electrons inhabit. There can be up to two electrons in the first electron shell, and there can be up to eight electrons in each of the second and third electron shells.
An atom's reactivity and chemical characteristics are governed by the number of electrons in its outermost shell.
Thus, the ideal selection is option 2.
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Which statement below best describes the temperature of the atmosphere at various altitudes?
A.) The mesosphere has a lower temperature than the thermosphere.
B.) The mesosphere has a higher temperature than the thermosphere.
C.) The temperature of the mesosphere is the same as the thermosphere.
D.) The altitude has no impact on the temperature of the atmospheric layers.
Answer:
A). The mesophere has a lower temperature than the thermosphere.
Explanation:
At the mesophere, the temperature decreases with height, reaching a minimum of about -90°C at the "mesopause". As we rise up in the mesophere, the temperture becomes colder and colder. Above the mesophere is the thermosphere, where variations in the sun's energy have a powerful influence on both the height of the top layer of the thermosphere and the temperature within it. Because of this, temperatures of the upper layer of thermosphere can vary from 500° C (932° F) to 2,000° C (3,632° F) or higher.
Most semiconductors are _____.
a. nonmetals
b. metalloids
c. synthetics
d. metals
Which equivalence factor set should you use to convert 126 g c to atoms c? (1 mol c/126 g c)(6.02 x 1023 atoms c/1 mol
c.(1 mol c/12.01 g c)(6.02 x 1023 atoms c/1 mol
c.(12.01 g c/1 mol c)(1 mol c/6.02 x 1023 atoms
c.(12.01 g c/1 mol c)(6.02 x 1023 atoms c/1 mol c)?
Answer: The equivalence factor set that should be used is [tex]\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex]
Explanation:
Molar mass of a substance is defined as the mass of one mole of a substance.
We know that:
Molar mass of carbon atom = 12.01 g/mol
Given mass of carbon atom = 126 grams
Applying unitary method:
12.01 grams of carbon occupies 1 mole
So, 126 grams of carbon will occupy = [tex]\frac{1mol}{12.01g}\times 126g[/tex]
According to mole concept:
1 mole of an element contains [tex]6.022\times 10^{23}[/tex] number of atoms
So, [tex]\frac{1mol}{12.01g}\times 126g[/tex] of carbon will contain = [tex]\frac{1mol}{12.01g}\times 126g\times \frac{6.022\times 10^{23}}{1mol}=\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex] number of atoms
Hence, the equivalence factor set that should be used is [tex]\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex]
1. Fill in the chart below (Table below) by writing formulas for the compounds that might form between the ions in the columns and rows. Some of these compounds don’t exist but you can still write formulas for them.
Which is the most active nonmetallic element in group 16?
Oxygen (O) is the most active nonmetallic element in group 16, known as the chalcogens, due to its high electronegativity and ability to form compounds with most elements.
Explanation:The most active nonmetallic element in group 16, also known as the chalcogens, is oxygen (O). Oxygen is highly reactive, forming compounds with most elements, and is a crucial component for life on Earth. Among the chalcogens, which include oxygen, sulfur, selenium, tellurium, and polonium, oxygen is the most electronegative, meaning that it has a stronger tendency to attract electrons towards itself in a chemical bond. This property makes oxygen the most active nonmetal in its group.
Tear gas has the composition 40.25% carbon, 6.19% hydrogen, 8.94% oxygen, 44.62% bromine. what is the empirical formula of this compound?
Answer: Empirical formula will be [tex]C_6H_{11}OBr[/tex]
Explanation: Assuming that the total mass of the given tear gas = 100g
Mass of each element will be equal to the percentages of each element given
Mass of Carbon = 40.25g
Mass of Hydrogen = 6.19g
Mass of Oxygen = 8.94g
Mass of Bromine = 44.62g
Now, converting mass of each element into their moles using the formula
[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
[tex]\text{Moles of carbon}=\frac{40.25g}{12g}=3.354moles[/tex] (Molar Mass of C = 12g)
[tex]\text{Moles of hydrogen}=\frac{6.19g}{1g}=6.19moles[/tex] (Molar Mass of H = 1g)
[tex]\text{Moles of oxygen}=\frac{8.94g}{16g}=0.558moles[/tex] (Molar Mass of O = 16g)
[tex]\text{Moles of Bromine}=\frac{44.62g}{80g}=0.558moles[/tex] (Molar Mass of Br = 80g)
Dividing moles of each element with the smallest number of moles calculated, we get the mole ratio of each element.
[tex]\text{Mole Ratio of carbon}=\frac{3.354moles}{0.558moles}=6.01\approx 6[/tex]
[tex]\text{Mole Ratio of hydrogen}=\frac{6.19moles}{0.558moles}=11.09\approx 11[/tex]
[tex]\text{Mole Ratio of oxygen}=\frac{0.558moles}{0.558moles}=1[/tex]
[tex]\text{Mole Ratio of bromine}=\frac{0.558moles}{0.558moles}=1[/tex]
The mole ratio of each element is written in the subscript of each element in the empirical formula.
Empirical Formula : [tex]C_6H_{11}OBr[/tex]
Empirical formula will be [tex]C_6H_{11}OBr[/tex]
Let us assume that the total mass of the given tear gas = 100g
Mass of each element will be equal to the percentages of each element given.
Mass of Carbon = 40.25g
Mass of Hydrogen = 6.19g
Mass of Oxygen = 8.94g
Mass of Bromine = 44.62g
Calculation for number of moles:Moles of Carbon= [tex]\frac{40.25g}{12g/mol}=3.354moles[/tex]
Moles of Hydrogen= [tex]\frac{6.19g}{1g/mol}=6.19moles[/tex]
Moles of Oxygen= [tex]\frac{8.94g}{16g/mol}=0.588moles[/tex]
Moles of Bromine= [tex]\frac{44.62g}{80g/mol}=0.558moles[/tex]
Calculation for mole-ratio:Mole- ratio of Carbon = [tex]\frac{3.354}{0.058}=6[/tex]
Mole- ratio of Hydrogen = [tex]\frac{6.19}{0.558}=11[/tex]
Mole- ratio of Oxygen = [tex]\frac{0.588}{0.588}=1[/tex]
Mole- ratio of Bromine = [tex]\frac{0.588}{0.588}=1[/tex]
The mole ratio of each element is written in the subscript of each element in the empirical formula.
Thus, Empirical Formula : [tex]C_6H_{11}OBr[/tex]
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___ HBr + ____ Mg(OH)2 ---> ____ MgBr2 + ____ H2O
You mix 55 ml of 1.00 m silver nitrate with 25 ml of 1.06 m sodium chloride. what mass of silver chloride should you form?
In the chemical reaction between silver nitrate and sodium chloride, the limiting reactant is sodium chloride. It reacts completely to form 3.79g of silver chloride.
Explanation:This question is about a chemical reaction between silver nitrate (AgNO₃) and sodium chloride (NaCl) to form silver chloride (AgCl) and sodium nitrate (NaNO₃). This is a double displacement reaction where Ag+ ions from AgNO₃ combine with Cl- ions from NaCl to produce AgCl.
Firstly, we need to consider the reaction stoichiometry as AgNO₃ + NaCl ----> AgCl + NaNO₃. This shows that one mole of silver nitrate reacts with one mole of sodium chloride to form one mole of silver chloride and one mole of sodium nitrate. Therefore, the reaction is a one-to-one ratio. Secondly, the number of moles of each reactant must be determined. Moles is given by volume in liters multiplied by concentration in mol/L. Hence, moles of AgNO₃ = 0.055 L * 1.00 mol/L = 0.055 mol and moles of NaCl = 0.025 L * 1.06 mol/L = 0.0265 mol.
As we see, NaCl is the limiting reactant, i.e., it will completely react and determine the amount of product formed. Therefore, the moles of AgCl formed will be 0.0265 mol. The mass of AgCl formed can be calculated from its molar mass (143.32 g/mol) by multiplying with the moles. Hence, mass of AgCl = 0.0265 mol * 143.32 g/mol = 3.79g.
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Mixing 55 ml of 1.00 M silver nitrate with 25 ml of 1.06 M sodium chloride results in the formation of 3.80 grams of silver chloride. Sodium chloride is the limiting reactant, and the calculation involves determining moles and using the balanced chemical equation. The molar masses are then used to find the mass of the product formed.
Step-by-Step Explanation:
1. The balanced chemical equation for the reaction between silver nitrate ([tex]AgNO_3[/tex]) and sodium chloride (NaCl) is:
[tex]AgNO_3 (aq) + NaCl (aq) \rightarrow AgCl (s) + NaNO_3 (aq)[/tex]
2. First, calculate moles of each reactant:
Moles of [tex]AgNO_3[/tex]= Volume (L) × Molarity (mol/L) = 0.055 L × 1.00 mol/L = 0.055 mol
Moles of NaCl = Volume (L) × Molarity (mol/L) = 0.025 L × 1.06 mol/L = 0.0265 mol
3. Identify the limiting reactant by comparing the mole ratio of reactants:
From the balanced equation, the mole ratio of AgNO3 to NaCl is 1:1.
Since 0.055 mol of [tex]AgNO_3[/tex]> 0.0265 mol of NaCl, NaCl is the limiting reactant.
4. Calculate moles of AgCl produced:
From the balanced equation, moles of AgCl formed are equal to moles of NaCl (limiting reagent).
Moles of AgCl = 0.0265 mol
5. Convert moles of AgCl to mass:
Mass = Moles × Molar Mass
Molar Mass of AgCl = 107.87 g/mol (Ag) + 35.45 g/mol (Cl) = 143.32 g/mol
Mass of AgCl = 0.0265 mol × 143.32 g/mol = 3.80 g
Therefore, the mass of silver chloride formed is 3.80 grams.
What quantity measures the amount of space an object occupies?
Answer:
Volume
Explanation:
Because if you got notes, or wrote some down they should say that volume measures the space an object occupies, therefor its volume
There are various quantities that can used to find the properties and measurements for an object. The space that an object occupies is called volume.
What is volume?Volume of a substance can be defined as the space it occupies.Volume can be expressed in liters, cm³ , ml, ppm etc.based on the state of the substance.
A substance can exhibit in any one of the three states namely solids, liquids and gases. In solids all the molecules are closely packed by the intermolecular attraction and thus solids have a perfect shape, size and volume and here we can use the unit cm³.
In the case of liquids there are some space between the molecules and thus liquids have no shape or size but they assume the shape and volume of the container in which it is taken.
In the case of gases, all the molecules are far apart without any force of attraction therefore, they can occupy a large volume in the atmosphere by spreading.
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Identify the parts of the energy diagrams
Answer : Graph 1 is an endothermic reaction and Graph 2 is an exothermic reaction. The labeling of both the graphs are shown below.
Explanation :
Endothermic reaction : In this reaction, the energy is absorbed from the surrounding.
In the endothermic reaction, the energy of reactant are less than the energy of product.
Exothermic reaction : In this reaction, the energy is released into the surrounding.
In the exothermic reaction, the energy of reactant are more than the energy of product.
Transition state : It is a state when the reactant molecules absorb energy then their bonds are loosened and new lose bonds are formed between them. The intermediate formed is known as activated complex or transition state. It is unstable state and immediately dissociates to form the stable products.
Activation energy : The minimum amount of energy absorbed by the reactant molecules so that their energy becomes equal to the threshold energy.
Hence, the labeling of both the graph 1 and 2 are shown below.
Suppose you haven’t cleaned out your locker all year. Where would you except to find papers from the beginning of the year? What principle of geology would you use to find these old papers?
The chemical formula of glucose is C6H12O6, so it is classified as a(n)
Answer:
The answer is D. Pure Substance
Explanation:
Describe how molecular models might prove to be helpful to scientists.
In part a, we saw that the theoretical yield of aluminum oxide is 0.700 mol . calculate the percent yield if the actual yield of aluminum oxide is 0.385 mol .
Which of the following has zero acceleration?
A. A satellite orbiting at a constant speed.
B. A car making a turn at a constant speed.
C. A person running 100 m straight across a field at a constant speed.
D. A person running once around a track at a constant speed.
Answer:
C. A person running 100 m straight across a field at a constant speed.
Explanation:
Acceleration is defined as the change in the velocity per unit time. Velocity have both direction and magnitude (speed) . So, acceleration involves both change in direction and speed.
A). The satellite is in a curved orbit, so direction of satellite is constantly changing. Hence, not the answer.
B). The car is following a curve, so its direction is changing. Hence, not the answer.
C). The person is running straight at constant speed which means no change of speed or direction. Hence, it is the answer.
D). The person is on curved track, so his/her direction is changing. Hence, not the answer.
What is the chemical characteristics of the compound barium oxide?
what occurs in a chemical reaction
a. reactants break bonds and form new bonds to make new substances.
b. reactants break bonds and reform the same bonds.
c. reactants break bonds but do not form new substances
d. no chemical bonds are broken
Answer:
a. reactants break bonds and form new bonds to make new substances.
I took test K12 :)
In a chemical reaction occurs that reactants break bonds and form new bonds to make new substances.
The chemical reaction is the way in which one substance reacts against another, that is, they are thermodynamic processes of transformation of matter.
These reactions involve two or more substances (reactants), which change significantly in the process, and can consume or release energy to generate two or more substances called products.
They involve the formation or destruction of chemical bonds between the molecules of the reactants, generating a loss or gain of energy.In a chemical reaction, matter is deeply transformed.They generate certain products depending on the nature of the reagents, but also on the conditions in which the reaction occurs.Therefore, we can conclude that in a chemical reaction occurs that reactants break bonds and form new bonds to make new substances.
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Which process is a form of mechanical weathering?
A: Wedging
B: Oxidation
C: Hydrolysis
D: Carbonation
Answer:
Wedging
Explanation:
Ice wedging is a form of mechanical weathering or physical weathering in which cracks in rock or other surfaces become filled with water,it now freezes and expands, causing the cracks in the rock to enlarge and eventually break in pieces.
The other options listed are chemical processes respectively.