Understanding Chemical Reactions

Presentation

•

Science

•

9th Grade

•

Medium

•

NGSS

MS-PS1-2, MS-PS1-5, MS-PS1-1

Standards-aligned

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15 Slides • 16 Questions

Multiple Choice

Spoiling food is an example of:

chemical change

physical change

no change

Multiple Choice

Which is an example of a different substance being formed?

glass breaking

metal melting

water freezing

wood burning

Multiple Choice

A change in an objects appearance, shape, and size without changing its composition is known as

Chemical change

Physical change

Physical-Chemical change

Multiple Select

Which of the following are signs of a chemical reaction?

Formation of a gas

A change in temperature

A change in color

A change in size

Multiple Choice

In a chemical reaction, the number of atoms in the reactants and the products...

Must be the same

Must be different

Multiple Choice

Which of these is NOT a sign of a chemical reaction?

A phase change

Formation of a precipitate

A color change

A temperature change

Multiple Choice

Evidence of a chemical reactions is anything that shows -

a new substance has formed

a solid dissolved in a liquid

interaction between 2 gases

a change in the state of matter

Multiple Choice

One of the signs of a chemical reaction taking place is:

Bubbles are produced

Reactants are not combining

Products are not forming

Color is not changing

Multiple Choice

Substances that form as the result of a chemical reaction

products

reactants

coefficients

subscripts

Multiple Choice

Coefficients in chemical formulas...

Multiply just the first atom

Add to the subscripts at the end of the molecule

Multiply elements without subscripts

Multiply EVERYTHING!

Multiple Choice

A ______ is a number written in front of a chemical formula.

Coefficient

Subscript

Exponent

Coordinator

Multiple Choice

The ______ are numbers found on the lower right-hand side of an element symbol.

Coefficient

Exponent

Multiplier

Subscript

Multiple Choice

Substances present at the start of a chemical reaction

subscripts

coefficients

reactants

products

Multiple Choice

When writing a chemical equation, reactants are on the _____________ while products are on the _________________.

top, bottom

right, left

left, right

bottom, top

Multiple Choice

The law of conservation of mass states

chemical reactions create new atoms

atoms cannot be created or destroyed

reactants vanish once a reaction takes place

products appear when a reaction takes place

Multiple Choice

Chemical equations

give directions for naming compounds

describe only biological changes

describe chemical reactions

show how to write formulas

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