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Q 1/40
Score 0
Which phrase BEST describes the periodic table?
30
approximately 100 elements classified as metals, nonmetals, and compounds
approximately 100 elements arranged in order of increasing mass
. an arrangement of all elements that are metals
an arrangement of approximately 100 elements organized in groups and families
Q 2/40
Score 0
Which electrons in a Bohr model are MOST LIKELY to be involved in chemical reactions?
30
the valence, or inner, electrons
any electron shown in the model
electrons that are closest to the nucleus
the valence, or outer, electrons
40 questions
Q.
Which phrase BEST describes the periodic table?
1
30 sec
Q.
Which electrons in a Bohr model are MOST LIKELY to be involved in chemical reactions?
2
30 sec
Q.
Copper, gold, and iron all have some of the same characteristic properties. They are all shiny and conduct electricity. They can be hammered into a shape and drawn into a wire. What classification of elements includes copper, gold, and iron?
3
30 sec
Q.
Atoms are a basic building block of certain types of matter. Atoms make up the elements that combine to form compounds, which make up much of what we use every day. Which of these substances is NOT made out of atoms?
4
30 sec
Q.
Which process represents a chemical change?
5
30 sec
Q.
Trini adds 10 g of baking soda to 100 g of vinegar. The mixture begins to bubble. When the bubbling stops, Trini finds the mass of the mixture. She determines that the mixture’s mass is 105 g. Why has the mass changed?
6
30 sec
Q.
Elements in the same group have similar chemical properties. Why do the elements in group 16 share similar chemical properties?
7
30 sec
Q.
If you know the atomic number of an element and the element’s position in the periodic table, what can you determine about the element?
8
30 sec
Q.
Which process is an example of a chemical change?
9
30 sec
Q.
A substance contains an arrangement of different types of atoms joined together by chemical bonds. Which of the following classes of substances could this describe?
10
30 sec
Q.
How are the elements on the periodic table arranged?
11
30 sec
Q.
Solid magnesium, Mg, reacts with oxygen gas, O2, to form the solid magnesium oxide, MgO. Which equation is a balanced chemical equation for this chemical change?
12
30 sec
Q.
. Atoms of different elements can join together in different arrangements to produce a variety of substances that are found on Earth. There are more than 100 known elements. Which of the following best describes these elements?
13
30 sec
Q.
Which of the following processes transfers the sun’s energy between particles as well as through empty space?
14
30 sec
Q.
The continent of Antarctica is covered with an ice sheet. Which part of the Earth system includes the ice sheet?
15
30 sec
Q.
The names of four atmospheric gases are listed below. Each gas makes up a different percentage of Earth’s atmosphere. Which gas is most abundant in Earth’s atmosphere
16
30 sec
Q.
The gases that make up Earth’s atmosphere are commonly referred to as air. What are the two most abundant gases in the atmosphere?
17
30 sec
Q.
Earth scientists have identified four distinct layers of the atmosphere. What is the correct order of these layers, from lowest to highest?
18
30 sec
Q.
Earth has both fresh water and salt water. About how much of Earth’s water is fresh water?
19
30 sec
Q.
As altitude increases, what happens to the pressure of the air?
20
30 sec
Q.
. Condensation is part of the water cycle. During condensation, water vapor cools and changes from a gas to a liquid. What happens when this process occurs near Earth’s surface?
21
30 sec
Q.
What is the main role of plants in the water cycle?
22
30 sec
Q.
A thermometer measures how hot or cold the air is. What does a thermometer measure?
23
30 sec
Q.
Which of these substances is a gas found that is found in the atmosphere?
24
30 sec
Q.
Runoff is most like which of the following?
25
30 sec
Q.
Many factors affect visibility. Which of the following would most affect visibility?
26
30 sec
Q.
In which form does water rise into the atmosphere when it evaporates?
27
30 sec
Q.
Which of the following items is sometimes considered a renewable resource and at other times considered a nonrenewable resource?
28
30 sec
Q.
Humans need fresh, clean water to survive. Which of these statements is TRUE about fresh water?
29
30 sec
Q.
Acid precipitation harms vegetation and reduces soil quality. Which of the following is MOST responsible for acid precipitation?
30
30 sec
Q.
Different areas are classified according to land use. Which of these areas would LIKELY have the largest human population and the highest levels of air pollution?
31
30 sec
Q.
Erosion is the process by which soil and sediments are moved by gravity, wind, and water. Erosion occurs naturally, but it can be accelerated by human activity. Which of these human activities most contributes to soil erosion?
32
30 sec
Q.
Eutrophication refers to a process of change that takes place in a body of water. Which of the following causes eutrophication?
33
30 sec
Q.
Everyone uses natural resources. How do natural resources benefit humans?
34
30 sec
Q.
Smog is a pollutant that can cause serious health problems. Smog is most often seen over large cities. Which of these substances is a main ingredient of smog?
35
30 sec
Q.
Lynnette is categorizing natural resources. Which of the following is a nonrenewable resource she should include on her list?
36
30 sec
Q.
Coal is a nonrenewable natural resource. Why is coal considered nonrenewable?
37
30 sec
Q.
Several factors can lead to land degradation. Which of these activities is least likely to contribute to land degradation?
