FINAL EXAM REVIEW

A new compound has just been developed. Its formula is: C17H2ON4NaO9P

How many different elements make up this compound?

• 8

• 7

• 6

• 32

Organisms are made of elements that form living matter. Which elements comprise the largest portion of living

matter?

• Hydrogen, carbon, oxygen, and nitrogen

• Chlorine, sodium, and oxygen

• Oxygen, carbon, and silicon

• Sulfur, calcium, carbon, and hydrogen

A student had a beaker with a small amount of baking soda. The student added a few drops of pickle juice to the

baking soda and observed fizzing and bubbling.

Based on observation, which of these can the student conclude?

• A chemical reaction produced a solid.

• No chemical reaction took place.

• Only a physical change happened.

• A chemical reaction produced a gas.

Strontium phosphate, Sr3(PO4)2, is a crystalline substance used in medicine and industry. How many phosphorus

atoms are represented in the formula for Sr3(PO4)2?

• 2

• 3

• 4

• 8

What is the mass number of a potassium (K) atom that has 20 neutrons?

• 18

• 19

• 20

• 39

Which of the following best describes an electron?

• It has no charge and about the same mass as a proton.

• It has a negative charge and much less mass than a proton.

• It has a positive charge and much more mass than a neutron.

• It has a negative charge and about the same mass as a neutron.

Which statement accurately describes the atoms of a specific element?

• An indium‚ In‚ atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.

• A scandium‚ Sc‚ atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.

• An aluminum‚ Al‚ atom contains 27 electrons and 27 protons inside the nucleus.

• A zinc‚ Zn‚ atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.

The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?

• 1

• 2

• 6

• 7

Which of the following is the symbol for chlorine?

• Ch

• C

• Cl

• Ce

Flour, sugar, cocoa, oil, and eggs are mixed together and placed in the oven to make brownies. When the

brownies are removed from the oven, they no longer look like the original ingredients.

Which of the following describes why the ingredients changed?

• A biological change occurred.

• No change occurred.

• A physical changed occurred.

• A chemical changed occurred.