Chemistry review

Which of the following is a chemical change?

• Iron rusting 
• Glass breaking
• Clothing ripping
• Hair cut

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What is the law of conservation of matter?

• Matter changes when reacted or changed.
• The mass of all reactants are changed during a physical or chemical change.
• The mass of the reactants is the same as the mass of the products.
• The mass of the products is different than the mass of the reactants.

Tags

NGSS.MS-PS1-5

Which of the following is evidence of a chemical change?  

• Change in state
• No new substance is formed
• Bubbles forming
• Change in shape

Tags

NGSS.MS-PS1-2

Which of the following is an example of a physical change, and why? 

• Fire burns in fireplace, because a new substance is formed. 
• Clothes are folded, because there is a color change. 
• A mirror is broken, because there is a change in shape/size.
• cookies are baked, because there is a change in temperature

This number is used to represent the number of each atom being represented.  What is the name of this number? 

• An Exponent
• The Coefficient
• A Molecule
• The Subscript

Tags

NGSS.MS-PS1-1

This appears on the left side of a chemical formula, and represents how many compounds there are.  What is the name of this number?

• A Dangling Participle 
• The Subscript
• A Prime Number
• The Coefficient

The atomic number of oxygen is

• 8

• 15.9994

• 16

• O

Tags

NGSS.MS-PS1-1

The number of electrons in a Lithium atom is

• 3

• 4

• 6

• 7

Tags

NGSS.MS-PS1-1

The opposite phase of melting is

• Condensation

• Vaporization

• Sublimation

• Freezing

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Electrons are

• Positively charged particles

• Negatively charged particles

• Neutral

Tags

NGSS.MS-PS2-3