Chapter 17 Test

 In which of the following situations does water undergo a change in chemical properties?

• The bathroom fills with steam when you take a hot shower.

• The neighbor's pond freezes over in winter.

• Water is broken down to yield H2 and O2.

• None of these.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Answer the following questions about the chemical reaction for the combustion of methane gas: CH4 + O2 → CO2 + H2O 

Is the chemical reaction for the combustion of methane balanced? If not, select the correct equation from the  ones listed below. 

• Yes, it is balanced. 

•  No, this is balanced: CH4 + O2 → CO2 + 4H2O

• No, this is balanced: CH4 + 2O2 → CO2 + 2H2O 

• No, this is balanced: CH4 + 4O2 → CO2 + H2O

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NGSS.MS-PS1-5

The statement, “ the process of breaking chemical bonds and reforming new bonds to create new substances”  can be used to describe: 

•  physical change only. 

• chemical change only

• both physical and chemical change.

•  neither physical nor chemical change.

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Of the following, the one which most likely involves a chemical reaction is: 

•  Slicing a piece of bread produces two pieces.

• Placing a solid and a liquid together produces heat and a gas.

•  Hitting a board with a hammer forms a dent in the surface of the wood.

• Heating an ice cube produces liquid water.

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NGSS.MS-PS1-2

 In the periodic table notation below, what information does the number 40.08 tell you? 

• It is the number of protons.

• It is the number of neutrons. 

• It is the atomic number.

• It is the atomic mass. 

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NGSS.MS-PS1-1

The Avogadro number is equal to:

•  6.02 × 1023 molecules.

•  One mole of a substance.

•  the number of atoms in the atomic mass of an element, when the mass is expressed in  grams.

• All of these.

 Antoine Lavoisier, a French scientist, established which principle?

• Mercury and oxygen are nonreactive. 

• An open system is required to observe changes in mass. 

• The total mass of the products of a reaction is always slightly more than the total mass of  the reactants. 

• The total mass of the products of a reaction is equal to the total mass of the reactants. 

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The principle of conservation of atoms is satisfied in a chemical equation when: 

• all of the atoms involved in the equation have an oxidation number of 1+

• The reactant side has the same number of each type of atom as the product side.

• the sum of the coefficients on the reactant side is the same as the sum of the coefficients  on the product side. 

• each atom on the product side has the same subscript that it had on the reactant side.

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NGSS.MS-PS1-5

The mass, in grams, of the Avogadro number of molecules of a compound is its:  

• formula mass

• molar mass

• inertial mass

• atomic mass

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What is the whole number placed in front of a molecular formula in a chemical equation called? 

• subscript

• superscript

• coefficient

• mole