1. Biology Visual PPT Quiz 6
Ch 1 and 2

2. Question 1: To be useful in Science, a Hypothesis must be
A. measurable
B. observable
C. correct
D. testable

3. Question 2: A controlled experiment allows the researcher to isolate and test a
A. conclusion.  B.  mass of information.  C.  group of variables.  D.  single variable.

4. Question 3: Acidic solutions contain high concentrations of OH– ions.
A. true
B. false

5. A. products. B. reactants. C. solids. D. gases.
Question 4: The elements or compounds formed by chemical reactions are the 
A. products.  B.  reactants.  C.  solids.  D. gases.
E. none of them

6. Question 5: Ionic bonds involve a sharing of electrons.
A. true
B. false

7. Question 6: Copper has atomic # 29
Question 6: Copper has atomic # 29. How many valence electrons are there.
A. 2
B.8
C. 6
D. 1
E. 3

8. Question 7: Balance this: __ C2H6O + __ O2 → __ CO2 + __ H2O
A. 2 C2H6O + 3 O2 → 2 CO2 + 3 H2O
B. 3 C2H6O + 2 O2 → 1 CO2 + 3 H2O
C. 1 C2H6O + 3 O2 → 3 CO2 + 3 H2O
D. 1 C2H6O + 3 O2 → 2 CO2 + 3 H2O

9. Question 8: __ NH3 + __ O2 → __ NO + __ H2O
A. 2 NH3 + 5 O2 → 2 NO + 6 H2O
B. 4 NH3 + 2 O2 → 4 NO + 6 H2O
C. 6 NH3 + 2 O2 → 4 NO + 4 H2O
D. 4 NH3 + 5 O2 → 4 NO + 6 H2O

10. B. __ TiCl4 + __ H2O __ TiO2 + __ HCl C. TiO2 + __ HCl
Question 9: In the equation __ TiCl4 + __ H2O → __ TiO2 + __ HCl, the reactants are:
A. __ TiCl4 + __ H2O
B. __ TiCl4 + __ H2O __ TiO2 + __ HCl
C. TiO2 + __ HCl
D. It’s a trick question…it’s not here

11. Question 10: __ C2H6O + __ O2 → __ CO2 + __ H2O
A. 1 C2H6O + 3 O2 → 2 CO2 + 3 H2O
B. 3 C2H6O + 7 O2 → 2 CO2 + 3 H2O
C. 1 C2H6O + 2 O2 → 2 CO2 + 3 H2O
d. 2 C2H6O + 3 O2 → 3 CO2 + 3 H2O

12. Bonus: __ B2Br6 + __ HNO3 → __ B(NO3)3 + __ HBr
A. 3 B2Br6 + 6 HNO3 → 2 B(NO3)3 + 6 HBr
B. 2 B2Br6 + 3 HNO3 → 2 B(NO3)3 + 3 HBr
C. 1 B2Br6 + 6 HNO3 → 2 B(NO3)3 + 6 HBr
D. 2 B2Br6 + 2 HNO3 → 2 B(NO3)3 + 3 HBr