Question

1 chemistry is often called the \central science\ because a) it is the oldest science. b) it connects other sciences together. c) it deals only with living things. d) it studies astronomy. 2 who is known as the \father of modern chemistry\ and proposed the combustion theory involving oxygen? a) john dalton b) robert boyle c) antoine lavoisier d) democritus 3 alchemists attempted to create the philosophers stone to a) change metals into gold. b) build stronger structures. c) produce renewable energy. d) discover protons and electrons. 4 in forensic science, chemistry is most useful in a) identifying suspects by photos. b) analyzing substances at crime scenes. c) interviewing witnesses. d) writing case reports. 5 which of the following is the first step in the scientific method? a) hypothesis b) observation c) experiment d) conclusion 6 if plants get more sunlight, then they will grow taller is an example of a) conclusion b) hypothesis c) law d) observation 7 the si base unit for mass is a) gram (g) b) kilogram (kg) c) pound (lb) d) ounce (oz) 8 a measurement that is close to the true value is said to be a) precise b) accurate c) approximate d) random 9 which of the following is not a derived si unit? a) joule (j) b) newton (n) c) meter (m) d) pascal (pa) 10 dimensional analysis is used to: a) balance chemical reactions b) convert units c) calculate density d) identify isotopes 11 matter that has a definite volume but no definite shape is a) solid b) liquid c) gas d) plasma 12 which of the following is a chemical change? a) melting ice b) tearing paper c) rusting of iron d) boiling water 13 which of the following is an intensive property of matter? a) mass b) volume c) density d) length 14 a homogeneous mixture is also known as a a) compound b) solution c) colloid d) suspension 15 the ability to do work or cause change is called a) matter b) energy c) heat d) power 16 who discovered the electron using the cathode ray experiment? a) j.j. thomson b) ernest rutherford c) james chadwick d) john dalton 17 the positively - charged subatomic particle is the a) electron b) neutron c) proton d) photon 18 the number of protons in an atom is equal to its a) atomic mass b) atomic number c) mass number d) neutrons 19 across a period in the periodic table, atomic radius generally a) increases b) decreases c) remains the same d) doubles 20 which element has the highest electronegativity? a) oxygen b) nitrogen c) fluorine d) neon - end -

Explanation:

1. Chemistry is called the "Central Science" because it connects other sciences together.
2. Antoine Lavoisier is the "Father of Modern Chemistry" and proposed the combustion theory involving oxygen.
3. Alchemists attempted to create the "Philosopher's Stone" to change metals into gold.
4. In forensic science, chemistry is most useful in analyzing substances at crime scenes.
5. The first step in the scientific method is observation.
6. "If plants get more sunlight, then they will grow taller" is an example of a hypothesis.
7. The SI base unit of mass is kilogram (kg).
8. A measurement that is close to the true value is said to be accurate.
9. Meter (m) is a base SI - unit, not a derived SI - unit.
10. Dimensional analysis is used to convert units.
11. Matter that has a definite volume but no definite shape is a liquid.
12. Rusting of iron is a chemical change.
13. Density is an intensive property of matter.
14. A homogeneous mixture is also known as a solution.
15. The ability to do work or cause change is called energy.
16. J. J. Thomson discovered the electron using the Cathode Ray Experiment.
17. The positively - charged subatomic particle is the proton.
18. The number of protons in an atom is equal to its atomic number.
19. Across a period in the periodic table, atomic radius generally decreases.
20. Fluorine has the highest electronegativity.

Answer:

1. b
2. c
3. a
4. b
5. b
6. b
7. b
8. b
9. c
10. b
11. b
12. c
13. c
14. b
15. d
16. a
17. c
18. b
19. b
20. c