CBA october review

How many Oxygen atoms are in C₆H₁₂O₆?

• 0

• 12

• 6

• 24

How many Potassium atoms are in K₂SO₄?

• 1

• 2

• 4

• 7

How many Carbons are in CO₂?

• 1

• 2

• 0

• 3

During a lab investigation, students poured baking powder into a beaker of vinegar. Students attached a balloon to the beaker and noticed the balloon grow and fill with gas. Students also observed bubbles forming inside the beaker. Students determined a chemical reaction occurred. What evidence supports the students hypothesis?

• Students mixed a solid with a liquid.

• The balloon filled with gas. Bubbles were observed.

• The white powder dissolved in the clear liquid.

During lunch, a student took a bite of pizza. The student's body begins digesting the pizza through both mechanical and chemical processes. Which is an example of a mechanical process?

• In the stomach, gastric acids break the pizza down further into a liquid called chyme.

• The student's teeth break apart the pizza into little pieces.

• The student's salivary glands release enzymes to break down starches.

• In the small intestines, enzymes produced by the gall bladder break the chyme down further.

Which example shows a chemical change to food during digestion?

• food moving through the intestines

• enzymes breaking down food

• Teeth chewing food

• food churning in the stomach

Match the following mystery substances with either metal, non-metal or metalloid.

• Metalloid

• Substance 2:

  Luster, malleable, conducts electricity

• Metal

• Substance 3:

  Dull, ductile, conducts heat

• Non-Metal

• Substance 1:

  Brittle, foul odor, powder

A student measured the mass and volume of a small cube made of an unknown metal. The mass of the cube is 31.5g and the volume of the cube 3cm³. What is this mystery metal?

• Aluminum

• Gold

• Silver

• Lead

The sample of a piece of wood has a mass of 30.5g and a volume of 5.8cm³. What is the density of the piece of wood?

• 8.5 g/cm³

• 5.3 g/cm³

• 3.5 g/cm³

• 6.2 g/cm³

Identify the electron on this atom model.