Re-Test 8.P.1.3 & 1.4

A series of numbers and letters that are used to represent a molecule

• physical property

• chemical property

• chemical formula

• atom

Tags

NGSS.MS-PS1-1

The small number to the right of an elemental symbol  ( H₂₎ is called?

• a subscript 

• a coefficient 

• a variable 

• a divisor 

How many Hydrogen atoms (H) are in a molecule of H₂O?

• 1

• 2

• 3

• 0

Tags

NGSS.MS-PS1-1

How many carbon atoms (C) are in a CO₂ molecule?

• 1

• 2

• 3

• 0

Tags

NGSS.MS-PS1-1

A change where one or more new substances are created.

• 
  Physical Change 

• Chemical Change 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is melting butter for popcorn a chemical or physical change?

• chemical

• 
  physical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Hydrogen peroxide breaks down to form water and oxygen gas. A thermometer indicates an increase in temperature. Which observation is evidence that a chemical reaction has occurred?

• The mass of the solution remains the same.

• Phase changes are observed.

• 
  The color of the solution remains clear.

• 
  The temperature of the solution increases.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

When two substances were combined, bubbles were produced and the temperature dropped.  This most likely means that:

• a chemical reaction took place

• the two substances had low boiling points

• one substance dissolved in the other

• the two substances are non-reactive

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-4

When coal burns carbon dioxide is produced from the carbon in coal and the oxygen in air. Which of these is the best evidence that a chemical reaction occurs when coal burns?

• The shape of the coal changes

• Oxygen is present

• A new substance is produced

• 
  Coal is made up of more than one element

Tags

NGSS.MS-PS1-2

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?

• 
  4g

• 5g

• 9g

• 
  14g

Tags

NGSS.MS-PS1-5