Unit 3 Test Corrections

A chemical change

• changes the physical properties of an object, but does not create a new substance.

• creates a new substance and cannot be undone.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which Law states that Matter cannot be created or destroyed during a Chemical Change/Reaction?

• Conservation of Energy
• Conservation of Matter (Mass)
• Conservation of Momentum
• Conservation of Thermodynamics

Tags

NGSS.MS-PS1-5

Which process represents a chemical change?

• A lake freezes over into ice

• Vinegar bubbles when baking soda is added

• A metal bar is rolled into a flat sheet

• Sand, water, and salt combine to form a mixture

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

If reactants' mass is 18g , what is the mass of the Products?

• 15

• 36

• 81

• 18

Tags

NGSS.MS-PS1-5

Consider the chemical equation CH₄ + 2 O₂ → CO₂ + 2 H₂O. In this equation, CH₄ is a

• product
• reactant
• displacement

Tags

NGSS.MS-PS1-5

Consider the chemical equation CH₄ + 2 O₂ → CO₂ + 2 H₂O. Is this equation balanced?

• Balanaced

• Unbalanced

• Undeterminable

Tags

NGSS.MS-PS1-5

How many TOTAL atoms are on the REACTANT side of this equation?
CH₄ + 2O₂ → CO₂ + 2H₂O 

• 5
• 7
• 9
• 11

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

 $C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2$  
Given this chemical equation, what are the PRODUCTS?

•  $C_2H_{6\ }and\ 5O_2$  

•  $2CO_2\ and\ 3H_2O_2$  

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

How many Hydrogen atoms are in 4H₂O?

• 6

• 8

• 2

• 4

Tags

NGSS.MS-PS1-1

How many Magnesium atoms are in 10MgCl₂?

• 10

• 5

• 20

Tags

NGSS.MS-PS1-1