Week 9 CCA Review 2019

A student measures the length of a strung three times: 0.93cm, 0.92cm and 0.91cm.  The true value is 1.55 cm.  Which is true?

• The student was accurate and precise.
• The student was accurate but not precise.
• The student was not accurate and not precise.
• The student was precise but not accurate.

The atomic number tells you what?

• number of electrons
• number of protons
• number of neutrons
• both electrons and protons in an atom.

What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL?

• 0.23 mL
• 4.34 mL
• 479 mL
• none of the above

Which liquid is the least dense?

• oil
• water
• syrup 
• plastic bottle

Romy's measurements: 6.02 m, 6. 04 m, 6.03 m
Actual Value: 6.02 m
How would you define her measurements?

• precise
• accurate and precise
• accurate
• neither accurate or precise

Accuracy is defined as

• close repeated measurements
• really good guessing
• measurement near the true value
• awesome measurements

Find the density of a 2 cm x 2 cm x 2 cm cube with a mass of 64 g.

• 6 cm³
• 12 g/cm³
• 128 g/cm³
• 8  g/cm³

This is an example of a

• physical change
• chemical change

True or False:  The density of a specific type of material never changes.  

• True
• False

DIFFERENT kinds of atoms chemically combined to form a substance are

• Mixture
• Element
• Compound
• Solution