Chapter 7 - Chemical Reactions - Physical Science

Which of the following is not evidence that a chemical change has occurred?

• a change in color

• a change in size

• a distinct smell

• a change in temperature

Tags

NGSS.MS-PS1-2

Which of the following is a balanced chemical equation?

• All the balanced chemical equations.

Tags

NGSS.HS-PS1-7

What is a mole?

• an equation

• a mass

• a quantity

• a ratio

• 1

• 2

• 3

• 6

Tags

NGSS.MS-PS1-5

The key feature of a decomposition reaction is that

• a single reactant becomes two or more products.

• both reactants and products include an element and a compound.

• two compounds swap ions, producing two new compounds.

• two or more reactants become a single product.

A key feature of a single-replacement reaction is that

• a single reactant becomes two or more products.

• both reactants and products include an element and a compound.

• two compounds swap ions, producing two new compounds.

• two or more reactants become a single product.

The term oxidation is used today to refer to

• any reaction that burns.

• any reaction where electrons are lost.

• fuel reacting with oxygen.

• reactions between metals and oxygen.

Which of the following occur(s) in a redox reaction?

• An element loses electrons.

• An element gains electrons.

• both of the other two

• neither of the other two

Which of the following reactions require(s) the presence of oxygen?

• combustion

• oxidation

• both of the other two answers

• neither of the other two answers

Chemical reactions that give off heat are called __________ reactions.

• catalytic

• conservation

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4