1. { Benchmark Review Write down the answer you think is correct, AND an explanation of WHY you picked that answer.

2. A) How science aids advancements in technology B) How society affects science and technology C) How technology can impact the global environment D) How new cars are being equipped with pollution services 1. The amount of carbon dioxide being released into the atmosphere by industry and cars may be the cause for the warming of Earth’s climate and melting of polar ice caps. This is an example of…

3. A) 1:1 B) 1:2 C) 2:1 D) 2:2 2. What is the ratio of carbon atoms to oxygen atoms in CO 2 ?

4. A) Ca and Fe B) Cl and Zn C) Ne and Na D) He and Rn 3. Which pair of elements has the most similar chemical properties?

5. A) They are noble gases. B) They are nonmetals. C) They have the same thermal conductivity. D) They have the same number of protons. 4. What do the elements sulfur (S), nitrogen (N), phosphorus (P) and Bromine (Br) all have in common?

6. A) Water, salt water, oil B) Oil, water, salt water C) Salt water, water, oil D) Salt water, oil, water 5. Which of the following substance lists is in the correct order from least dense to most dense?

7. A) filtration B) evaporation C) Magnetic separation D) Chemical separation 36% of students got this answer correct 15. Which process is most effective for separating sodium chloride (NaCl) from a saltwater solution?

8. A) The mass of the container will increase. B) The mass of the container will remain the same. C) The mass of the container will decrease. D) A chemical reaction cannot occur in a closed container. 21% of students answered this question correctly. 19. A chemical reaction takes place in a closed container. Which of the following statements is true?

9. A) Ammonia B) Sugar C) Mercury D) Water 25% of students answered this correctly. 20. Which substance cannot be broken down by a chemical change?

10. A) 10 °C B) 120 °C C) 100 °C D) 110 °C 27% of students answered this question correctly. 25. A beaker with 100mL of water is placed on a hot plate and heated. The water boils at 100°C. At what temperature will 90mL of water boil?

11. A) Solutions are homogeneous mixtures. B) Mixtures can be made of solids, liquids and gases. C) The ingredients of any mixture can be physically separated from one another. D) Ingredients of a mixture can be chemically combined. 22% of students answered this correctly. 29. Which of the following is not true regarding mixtures?