Unit 3 Review

The Law of Conservation of Mass States

• Energy cannot be created nor destroyed, it can only change form.

• Mass cannot be created nor destroyed, it can only change form.

• Matter cannot be created nor destroyed, it can only change form.

• Mass can be created or destroyed, it cannot change form.

In this chemical equation , CH₄ and 2O₂ are called the...

• Products

• Reactants

• Coefficient

• Subscript

There are 4 hydrogens in the products of the equation. How many hydrogens would you expect in the reactants?

• 1

• 3

• 4

• 5

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The mass after a physical change, such as ice melting into water, stays the same

• True
• False

What can cause ice to melt from a solid to a liquid?

• The air.

• The cold.

• Shape

• Heat

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

A ______________________ ___________________________ causes a material to change into an entirely different material with different properties, but conserves matter.

• physical change

• chemical

• chemical change

• physical chemical interaction

Law of conservation of mass (matter) states that

• matter is created

• matter is destroyed

• matter is neither created nor destroyed

• matter does not change

What is a mixture?

• elements chemically combined
• a combination of different things
• it is found on the Periodic Table 
• it is made of chemical

What does it mean if a mixture is heterogeneous?

• you can see the different parts
• cannot tell one part from another
• very well blended
• made of elements