New York Science Grade 7

Chapter 10: Atoms, Elements, and the Periodic Table

Matter

1
Which of the following is a form of matter?
A)light
B)air
C)energy
D)heat
2
An atom containing six positive charges and six negative charges has __________ charge.
A)a positive
B)no net
C)a strong negative
D)a negative
3
The atomic mass of an element is __________ of that element.
A)the average mass of an atom
B)the number of protons in each atom
C)the number of protons plus the number of neutrons of an atom
D)the number of electrons in each atom
4
Which of the following best describes the three general groups of elements?
A)solid, liquid, and gas
B)metals, metalloids, and synthetics
C)metals, nonmetals, and noble gases
D)metals, metalloids, and nonmetals
5
Which of the following is a compound?
A)air
B)water
C)blood
D)brass
6
If an alpha particle passes straight through a gold atom, what part of the atom did it pass through?
A)an electron
B)a proton
C)a neutron
D)the empty space within the atom
7
Which of the following elements would make the best electrical wire?
A)copper
B)carbon
C)fluorine
D)selenium
8
Scientists have broken down protons and neutrons into smaller particles called __________ .
A)quarks
B)isotopes
C)nuclei
D)vacuoles
9
What group contains elements that are gases at room temperature?
A)nonmetals
B)metals
C)isotopes
D)metalloids
10
An example of a synthetic element is __________ .
A)plutonium
B)aluminum
C)iron
D)nitrogen
11
In his experiments with gold foil, why did Rutherford conclude that the gold atoms contained some positively-charged objects?
A)After colliding with the gold foil, some of the alpha particles were heavier.
B)He knew that a gold atom has a net positive charge.
C)Some of the alpha particles bounced off the gold foil instead of passing through.
D)He observed alpha particles passing through the gold foil.
12
The atomic number of manganese is 25; its mass number is 55. How many neutrons does an atom of manganese have in its nucleus?
A)55
B)30
C)80
D)25
13
Democritus believed that the universe was made of empty space and __________ .
A)molecules
B)elements
C)compounds
D)atoms
14
Rutherford called the positively charged, central part of the atom the __________ .
A)proton
B)electron
C)nucleus
D)neutron
15
The law of conservation of matter states that __________ .
A)matter is not created or destroyed and its form is constant
B)matter is not created or destroyed
C)matter can be created and destroyed but cannot change form
D)the mass of all substances present before a chemical change equals the mass of all the substances remaining after the change
16
Why did J.J. Thomson conclude that cathode rays were made up of small particles that had mass?
A)They were bent by a magnet.
B)The metal plates in his experiment had no net charge.
C)He could see individual particles traveling from the negatively charged plate to the positively charged plate.
D)Some of the rays changed direction and bounced back.
17
A(n) __________ is a material that cannot be broken down into simpler materials by ordinary means.
A)mixture
B)metal
C)element
D)compound
18
Which of the following is a characteristic of most metals?
A)dull in appearance
B)poor conductors of electricity
C)gases at room temperature
D)shiny luster
19
Which of the following methods would be most useful for describing atoms?
A)observing in a test tube
B)visualizing with a microscope
C)constructing a model
D)touching with bare hands
20
What nineteenth century scientist designed the atomic theory of matter?
A)J.J. Thomson
B)Isaac Newton
C)John Dalton
D)Ernest Rutherford
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe