Chemistry Unit 5

Which of the following is NOT evidence of a chemical reaction?

• Heat and light produced

• Smell produced

• Gas Produced

• Solid formed

Tags

NGSS.MS-PS1-2

In a chemical reaction, the _______________ are what you start with.

• Products

• Reactants

In a chemical reaction, the _______________ are what you end up with (the result).

• Products

• Reactants

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The Law of Conservation of Mass states that matter

• can be created but not destroyed

• cannot be created but can be destroyed

• can neither be created nor destroyed

• can be created and destroyed

Tags

NGSS.MS-PS1-5

According to the law of conservation of mass, 20 grams of hydrogen and 20 grams of oxygen will react to form how many grams of water?

• 20

• 10

• 40

• 0

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The whole number in front of a chemical formula is known as

• a coefficient

• atomic mass

• subscript

• atomic number

Small numbers in the bottom right hand corner of elements in formulas are called

• coefficients

• atomic masses

• subscripts

• atomic numbers

How many hydrogen atoms are in the formula 3 H2SO4

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1

What do I change in order to balance a chemical equation?

• Subscripts

• Coefficients

• Superscripts

• Formulas

Tags

NGSS.MS-PS1-5

Coefficients indicate the number of ___________ of a substance.

• Atoms

• Grams

• Ions

• Moles

Tags

NGSS.HS-PS1-7