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Q 1/25
Score 0
Earth's air is made up of molecules of different gases that are not joined chemically. Which term best describes air?
30
element
mixture
pure substance
compound
Q 2/25
Score 0
Which statement best descibes the periodic table?
30
The atomic mass decreases from left to right.
The number of electrons decreases from left to right.
Elements in the same group have similar chemical properties.
Each vertical column forms a period.
25 questions
Q.
Earth's air is made up of molecules of different gases that are not joined chemically. Which term best describes air?
1
30 sec
Q.
Which statement best descibes the periodic table?
2
30 sec
Q.
Which of these elements is most likely to have chemical properties similar to those of calcium (Ca)?
3
30 sec
Q.
Which is most likely to conserve energy resources?
4
30 sec
Q.
Which is an advantage of using nuclear power plants?
5
30 sec
Q.
Which is a possible consequence of using hydropower to produce electricity?
6
30 sec
Q.
About what percentage of Earth's surface is covered with water?
7
30 sec
Q.
Which organism is most likely to be found near the surface of the open ocean?
8
30 sec
Q.
What is the relationship between water temperature and dissolved oxygen?
9
30 sec
Q.
Which is a biological indicator of water quality?
10
30 sec
Q.
The fossils of swamp plants and animals have been found in desert rocks. What is the best explanation for this?
11
30 sec
Q.
Which term is used to describe all disease -causing microorganisms?
12
30 sec
Q.
Measles is a disease caused by a virus. Which is the most effective way to keep measles from spreading?
13
30 sec
Q.
Which is not considered to be a living organism?
14
30 sec
Q.
Which term best describes an outbreak of flu that affects many people in a local area?
15
30 sec
Q.
Studying biotechnology is least likely to be helpful for which career?
16
30 sec
Q.
When European settlers first came to North Carolina, they cleared land for farms and raised sheep and cattle. What effect did this have on space, competition and populations of Eastern elk and wood bison?
17
30 sec
Q.
Which term best describes an organism that lives in or on another organism?
18
30 sec
Q.
Which provides the best evidence that sharks and dolphins are not closely related?
19
30 sec
Q.
Which is least likely to show that two species share a common ancestor?
20
30 sec
Q.
How is adaptation shown in the evolutionary history of the whale?
21
30 sec
Q.
How do plant cells use the energy of sunllight to make glucose?
22
30 sec
Q.
Which is the best explanation for why a healthy diet supports a person's general health?
23
30 sec
Q.
Which term best describes matter that contains only one kind of atom?
24
30 sec
Q.
Which action causes a physical change but not a chemical change?
