Chemical Reactions and Counting Atoms

A subscript is the small number below a(n) ________ that tells the number of _______ of that element.

• element symbol; atoms

• atom; element symbol

• subscript; protons

• compound; elements

If there is no subscript, there is ______ atom(s) of that element

• 0

• 1

• 2

• 10

Tags

NGSS.MS-PS1-1

How many atoms are in the element Carbon in this compound?

H₂C₃O₄N₅

• 2

• 4

• 5

• 3

Tags

NGSS.MS-PS1-1

How many TOTAL atoms are in this compound?

H₂C₃O₄N₅

• 14

• 15

• 5

• 19

Tags

NGSS.MS-PS1-1

Which of these is NOT a compound?

• OH

• H₂Cr

• PNi

• Cr₃

Tags

NGSS.MS-PS1-1

Element or compound?

O₂

• Compound

• Element

Tags

NGSS.MS-PS1-1

Which is the correct formula for:

three hydrogen (H)

one sulfur (S)

four oxygen (O)

• H₃SO₄

• HSO₄

• H₄S₃O

• H₂O

Tags

NGSS.MS-PS1-1

The substances at the beginning of a chemical equation are called the ____

• product

• yield

• reactants

• chemical symbol

What is a chemical equation?

• A short way to show a chemical reaction using symbols

• A way to explain a chemical reaction using words

Name ALL the evidences that show a chemical reaction has occurred.

• light, precipitate, odor,

• temperature, smell, light, conductivity, taste

• color, gas, light

• color, gas, light, temperature, precipitate

Tags

NGSS.MS-PS1-2