Chemistry Precision and Design Test 4

What does stoichiometry include?

• A) Chemical reactions

• B) Classify reactions

• C) Quantitative relationships of chemical reactions

• D) All of the above.

Define chemical reactions: ______ changes caused by collisions between atoms or molecules.

• Physical

• Chemical

• Biological

• Nuclear

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What was Dalton’s proposed atomic theory?

• Atoms are created in chemical reactions

• Atoms are destroyed in chemical reactions

• Atoms are not created or destroyed in chemical reactions, only rearranged

• Atoms are converted into energy.

Tags

NGSS.HS-PS1-7

What is the law of conservation of mass?

• The sum of the masses of the products is always equal to the sum of the reactants

• The mass of the reactants is greater than the mass of the products

• The mass of the products is greater than the mass of the reactants

• Mass is lost in a chemical reaction.

Tags

NGSS.HS-PS1-7

What are the four types of common chemical reactions?

• Combination

• Decomposition

• Single displacement

• Double displacement

• Composition

Describe a decomposition reaction: This is the reverse of a combination reaction, a decomposition reaction involves the breakdown of a single reactant into two or more simpler substances. True or False?

• True

• False

A single displacement reaction involves replacing one element in a compound with (a)   .

• another
• itself
• the same element
• none

The purpose of writing a balanced equation in a chemical reaction is to (a)  

• To determine the temperature
• To identify the reactants
• To ensure mass conservation
• To find the pressure.

Tags

NGSS.HS-PS1-7

Which of the following is not a step in solving a chemical reaction problem?

• A) Write a balanced equation

• B) Convert moles to mass

• C) Use mole ratios

• D) Measure temperature

Fill in the blank: Using mole ratios from the balanced equation helps to convert moles of given substance to moles of substance ____.

• produced

• requested

• dissolved

• evaporated