Counting Atoms and Chemical Reactions

How many Hydrogen are in 4H₂O?

• 8

• 6

• 4

• 2

Tags

NGSS.MS-PS1-1

How many total atoms are in H₂SO₄?

• 3

• 5

• 6

• 7

Tags

NGSS.MS-PS1-1

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

• element symbol, atoms

• atom, element symbol

• subscript, protons

• compound, elements

Tags

NGSS.MS-PS1-1

What is a coefficient?

• the small number on the right of the chemical symbol

• the large number to the left of a formula

• the numbers inside of the parentheses

• the small number to the left of the chemical symbol

Tags

NGSS.MS-PS1-5

What is the total number of atoms present in 5Na₃PO₄?

• 55

• 40

• 8

• 5

Tags

NGSS.MS-PS1-1

What is the little number after an element in a chemical equation called? H₂

• Element

• Atom

• Coefficient

• Subscript

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.MS-PS1-5

What is the part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

What is the part of a chemical equation called...
2H_{2 +} O₂--> 2H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

Which statement is not a description of a chemical reaction?

• A solid is dropped into a beaker of liquid and a gas is released.

• Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.

• A solid is dropped into a beaker of liquid and an explosion occurs.

• A liquid is heated in the sun and half of it evaporates.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5