1.
A supersaturated solution is:
A
Very dilute
B
Contains more solute than saturated solution
C
Contains no solute
D
A suspension
2.
The study of atomic structure helps to understand:
A
Weather
B
Chemical behavior
C
Biology
D
Geography
3.
Ibrahim is learning about electron affinity. He knows that electron affinity is the energy change when an electron is added to a gaseous atom. Which group has the most negative electron affinities (most favorable)?
A
Alkali metals
B
Halogens
C
Noble gases
D
Alkaline earth metals
4.
Which factor affects solubility?
A
Temperature
B
Color of solute
C
Shape of container
D
Volume of air
5.
Quinn is studying the solubility of potassium nitrate in water. He heats the water and finds that more potassium nitrate dissolves. What is the effect of temperature on the solubility of most solids?
A
Solubility increases as temperature increases
B
Solubility decreases as temperature increases
C
Temperature has no effect on solubility
D
Solubility first increases then decreases
6.
Yusuf is studying the prediction of properties of elements in Group 17. He predicts that astatine, the element below iodine, would have certain properties. What is the likely state of astatine at room temperature?
A
Gas
B
Liquid
C
Solid
D
Plasma
7.
Tina is studying the properties of halogens. She notes that the color of halogens becomes darker as we move down the group. What is the color of iodine at room temperature?
A
Pale yellow gas
B
Greenish-yellow gas
C
Red-brown liquid
D
Grey-black solid
8.
Sam is studying the position of an unknown element in the periodic table. He determines that the element has an electronic configuration of 2,8,7. In which group and period is this element?
A
Period 3, Group 17
B
Period 3, Group 7
C
Period 2, Group 17
D
Period 2, Group 7
9.
Vera is studying how chemistry contributes to technology. She reads about the development of touchscreens that use indium tin oxide. Which branch of chemistry is involved?
A
Organic chemistry
B
Inorganic chemistry
C
Polymer chemistry
D
Biochemistry
10.
Xia is studying the properties of alkali metals. She notes that they are soft and can be cut with a knife. As we move down Group 1, the softness of alkali metals generally:
A
Decreases
B
Increases
C
Stays the same
D
Fluctuates
11.
According to Bohr, electrons move in:
A
Random paths
B
Fixed energy levels
C
Straight lines
D
Nucleus
12.
A homogeneous mixture has:
A
Different visible parts
B
Uniform composition
C
Large particles
D
Only solids
13.
Atomic number is equal to the number of:
A
Neutrons
B
Protons
C
Electrons and neutrons
D
Protons and neutrons
14.
Rachel is studying the reactivity of halogens. She knows that the halogens undergo displacement reactions. Chlorine can displace bromine from potassium bromide. Which halogen is the most reactive?
A
Iodine
B
Bromine
C
Chlorine
D
Fluorine
15.
Victor is studying the melting points of metals and non-metals. He notes that most metals have high melting points, while non-metals have lower melting points. Which of the following has a high melting point?
A
Chlorine
B
Sulfur
C
Iron
D
Oxygen
16.
The smallest particle of an element that retains its properties is:
A
Molecule
B
Atom
C
Ion
D
Electron
17.
Uma is comparing the thermal conductivity of metals and non-metals. She knows that metals are good conductors of heat. Which of the following is a non-metal with good thermal conductivity?
A
Graphite
B
Sulfur
C
Oxygen
D
Neon
18.
Tina is studying electronic configuration. She is writing the configuration for oxygen (atomic number 8). What is the correct electronic configuration for oxygen?
A
1s2 2s2 2p4
B
1s2 2s2 2p6
C
1s2 2s2 2p2
D
1s2 2s2 2p3
19.
Solubility of gases in liquids increases with:
A
Increase in temperature
B
Decrease in pressure
C
Increase in pressure
D
Heating strongly
20.
Which branch of chemistry deals with carbon compounds?
A
Inorganic chemistry
B
Physical chemistry
C
Organic chemistry
D
Analytical chemistry
21.
Rachel is making a mixture of flour and water. The mixture is cloudy and particles do not settle quickly. She knows this is not a true solution. What is this mixture classified as?
A
Suspension
B
Colloid
C
Solution
D
Element
22.
Khalid is studying atomic number and mass number. He learns that the atomic number of an element is the number of protons. What is the mass number?
A
The number of electrons
B
The number of protons plus the number of neutrons
C
The number of protons plus the number of electrons
D
The number of neutrons only
23.
What is matter?
A
Anything that has mass and occupies space
B
Anything that has energy only
C
Anything that can move
D
Anything that produces heat
24.
Non-metals are mostly found on:
A
Left side
B
Center
C
Right side
D
Bottom
25.
Ming is studying transition elements and their compounds. He notes that transition metal compounds are often colored. Why are transition metal compounds colored?
A
Because they absorb light due to electron transitions in d-orbitals
B
Because they are always solid
C
Because they react with acids
D
Because they have variable oxidation states
26.
Which branch studies chemicals present in the environment?
A
Industrial chemistry
B
Environmental chemistry
C
Polymer chemistry
D
Nuclear chemistry
27.
A heterogeneous mixture has:
A
Uniform composition
B
Same properties throughout
C
Non-uniform composition
D
Only liquids
28.
According to modern atomic theory, electrons behave as:
A
Particles only
B
Waves only
C
Particles and waves
D
Rays
29.
Oliver is learning about the uses of transition metals. He knows that some transition metals are used as catalysts in industrial processes. Which of the following is often used as a catalyst?
A
Sodium
B
Iron
C
Chlorine
D
Helium
30.
Ivan is learning about ions. He knows that atoms can gain or lose electrons to become ions. What is an anion?
A
A positively charged ion
B
A negatively charged ion
C
A neutral atom
D
An atom with no electrons