Reading Chemical Formulas

All of the following are chemical changes except

• iron rusting
• water evaporating
• wood burning
• food rotting

Tags

NGSS.MS-PS1-2

How many phosphorus atoms are there?

• 0

• 1

• 3

• 4

Tags

NGSS.MS-PS1-1

Coefficients in chemical formulas...

• Multiply just the first atom

• Add to the subscripts at the end of the molecule

• Multiply elements without subscripts

• Multiply EVERYTHING!

Tags

NGSS.MS-PS1-1

How many elements are in this chemical formula?

• 7

• 8

• 3

• 4

Tags

NGSS.MS-PS1-1

How many atoms are in this chemical formula?

• 7

• 8

• 3

• 4

Tags

NGSS.MS-PS1-1

Match the following

• H₂O₄

• 
• 2H₂O

• 
• H₂O₂

• 
• CH₄

• 
• C₂H₄

• 

Tags

NGSS.MS-PS1-1

50 ml of water was added to the graduated cylinder. After we drop in the object, the new water level goes up to 60 ml. What is the volume of the blocks?

• 8 ml

• 10 ml

• 60 ml

• 5 ml

Tags

NGSS.MS-PS1-2

How would you calculate the density of the blocks shown in the picture if the mass of the blocks is 20 grams?

• 10ml is the density of the blocks.

Answer explanation

The picutre of the graduated cylinders shows the volume of the blocks. Sutract the beginning volume from the ending volume. Then plug the mass and volume into the density triangle.