Chemical Reactions Topic 4 Review

Chemistry is

• a characteristic of a substance that can be observed without changing the substance into another substance.
• the study of matter and how matter changes.
• anything that has mass and takes up space.
• a rapid reaction between oxygen and a substance called a fuel.

Tags

NGSS.MS-PS1-5

The only sure evidence for a chemical reaction is

• the formation of a gas
• a color change
• the production of one or more new subtances
• changes in properties

Tags

NGSS.MS-PS1-2

A material used to decrease the rate of a chemical reaction is a(n)

• inhibitor
• catalyst
• enzyme
• fuel

CaCO3 represents a chemical [the 3 is a subscript]

• symbol
• formula
• subscript
• reaction

Exothermic or endothermic - Ammonium Nitrate and water are used to make an instant ice pack

• exothermic
• endothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The law of conservation of mass is true

• only for reactions that take place in open systems
• only for reactions that take place in closed systems
• for reactions in both open and closed systems
• for no reactions at all

Tags

NGSS.MS-PS1-5

In chemical reactions, what does the law of conservation of mass mean?

• Matter is not created or destroyed
• The total mass of the reactants is greater than the total mass of the products
• The total mass of the reactants is less than the total mass of the products
• matter is not changed

Tags

NGSS.MS-PS1-5

Which process turns matter into one or more substances?

• physical change
• chemical change
• conservation
• freezing

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Water vapor in the air turns to liquid water in the form of rain. This is an example of a

• physical change
• chemical change
• chemical equation
• chemical formula

A solid that forms from a solution during a chemical reaction is called a

• reactant
• bond
• chemical
• precipitate

Tags

NGSS.MS-PS1-2