An Introduction To Chemistry

 

Answer Sheet

 

 

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An Introduction To Chemistry

 

 

1. During his distinguished career this scientist received two unshared Nobel prizes. One for chemistry and one for peace.

Alfred Nobel

Marie Currie

Linus Pauling

Albert Einstein

 

2. The study of matter and the changes it undergoes describes the science of .

physics

mathematics

chemistry

biology

 

3. The is the fundamental unit of matter.

atom

compound

nucleus

proton

 

4. The atom is composed of three subatomic particles known as , and .

neutrals, electives and peeons

quarks, alpha rays and xenons

electrons, protozoans and electricals

protons, neutrons and electrons

 

5. Protons are charged particles found in the nucleus of an atom.

neutrally

positively

negatively

brighltly

 

6. Electrons are charged particles that orbit the nucleus of an atom.

negatively

positively

neutrally

brighltly

 

7. Neutrons are particles found in the nucleus of an atom.

negatively charged

positively charged

uncharged

brightly

 

8. An ion is an atom or molecule that .

is electrically neutral

is composed of two or more elements

is man made

carries a charge

 

9. Which of the following chemical species is a cation?

Cl-

H+

Au

HCO3-

 

10. The atomic number of an atom or element describes the number of .

electrons orbiting the nucleus

neutrons in the nucleus

alpha particles in the nucleus

protons in the nucleus

 

11. Mass is proportional to the number of that make up an object.

atoms

cells

neutrons

protons

 

12. Weight is best described as .

the number of atoms in an object

the pull of gravity on matter

the electrical charge on an ion

the number of electons in an atom

 

13. Atoms of any one type of element, such as gold, all posess the same number of .

electrons

neutrons

protons

nuclei

 

14. There are currently known elements.

65

98

112

152

 

15. Element are one or two letter abbreviations for the names of the elements.

numbers

atomic numbers

symbols

characters mass

 

16. Two or more elements that combine as a result of a chemical reaction form .

atoms

ions

mixtures

compounds

 

17. An example of a mixture would be .

a bar of pure gold

the air we breathe

sodium chloride salt

pure water

 

18. The three states of matter are , and .

atoms, molecules and compounds

atoms, compounds and mixtures

solids, liquids and gases

solids, gases and steam

 

19. The least dense and most energetic of the three states of matter is .

the gaseous state

the liquid state

the solid state

the elemental state

 

20. All measurements must consist of both .

a size and a shape

a price and a volume

a number and a unit

a color and a number

 

21. Density is a physical property that refers to .

the number of atoms in an object

the weight of an object

the mass of an object relative to its volume

the weight of an object relative to its cost

 

22. A kilogram is equal to grams.

1

10

100

1,000

 

23. There are centimeters in a meter.

1

10

100

1,000

 

24. Measurements are because of equipment error and human judgment.

useless

uncertain

perfect

inaccurate

 

25. The number 221.5 contains significant figure(s).

1

2

3

4

 

26. The number .001 contains significant figure(s).

1

2

3

4

 

27. The number 226 would be scientifically noted as .

226

2.26 x101

2.26 x 102

22.6 x 101

 

28. The figure .005 would be scientifically noted as .

5 x 10-1

5 x 10-2

5 x 10-3

5 x 10-4

 

29. Elements or atoms are arranged on the periodic table in the order of increasing .

atomic mass

atomic weight

atomic number

atomic symbols

 

30. A substance that weighs 10 grams and has a volume of 2 cm3 would have a density of .

5 g/cm3

10g/cm3

2g/cm3

15g/cm3

 

31. The terms Kelvin, Celsius and Fahrenheit all correspond to units of .

density

hardness

volume

temperature

 

32. The is the SI standard unit for measurements of length.

cetimeter

foot

meter

yard

 

33. One kilogram is equal to approximately pounds.

1.2

2.2

3.2

4.2

 

 

 

 

 

 

 

 

 

 

 

 

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