A
B
C
D
E
100
A student reads three statements from a science book.
The student uses the information to make a particle model representing the molecules of water in the three states: ice, water, and water vapor. Which model is correct?
rrect?
A
- B
- C
- D
C
100
The graph below shows the relationship between the pressure and volume of a gas.
What is the pressure when the volume is 6.5 mL?
0.6 ATM
100
A student measures the acidity of a sample of water to determine how the chemical properties of the water affect the survival of different aquatic species. Which tools should the student use to measure the acidity of the water?
A. scalpel and test tubes
B. alcohol and test tubes
C. pH paper and test tubes
D. magnifying glass and test tubes
C. pH paper and test tubes
100
Deer are introduced into a grassland ecosystem and their population increases considerably. If the deer population continues to grow, which is the most likely outcome for the ecosystem?
Responses
- A
Biodiversity would decrease, and sustainability would decrease.
- B
Biodiversity would decrease, and sustainability would increase.
- C
Biodiversity would increase, and sustainability would increase.
- D
Biodiversity would increase, and sustainability would decrease.
- A
Biodiversity would decrease, and sustainability would decrease.
100
A researcher uses several procedures to separate a rock sample into different chemicals. A mass of 50 grams of one chemical is produced. If this chemical cannot be separated into other chemicals, then it is best described as
Responses
- A
a compound.
- B
a mixture.
- C
a solution.
- D
an element.
D
an element.
200
A student places a piece of magnesium metal in a test tube containing acid. The student records four observations during the experiment.
Which observation is a characteristic of a chemical change?
A. 1
B. 2
C. 3
D. 4
C
200
The diagram shows the same balloon at different temperatures.
A decrease in temperature reduces the
- A
volume of the balloon.
- B
strength of the balloon.
- C
mass of gas particles in the balloon.
- D
number of gas particles in the balloon.
A. the Volume of the Balloon
200
A teacher gives three unknown solutions (X, Y, and Z) to her students. The students test the solutions using red and blue litmus and phenolphthalein, and they record their observations in a table, as shown.
Which solution(s) can be classified as an acid?
Which solution(s) can be classified as an acid?
Responses
A. X only
B. Y only
C. X and Z
D. Y and Z
A. X only
200
Marine dead zones can form when nutrient run-off causes certain types of algae to grow very quickly and then die off. As dead algae decompose, oxygen is removed from the water. With less oxygen available, fish and other marine animals can die. What would be one practical way to reduce marine dead zones?
A. Add bacteria that are able to eat the fast-growing algae.
B. Harvest marine fish in dead zone areas to reduce oxygen use.
C. Pump oxygen into the water using equipment on fishing vessels.
D. Prevent fertilizer and other wastes from entering rivers and streams.
D. Prevent fertilizer and other wastes from entering rivers and streams.
200
An engineer attempts to pull two different materials, X and Y, into wires. Material X can easily be drawn into a wire, but material Y quickly breaks into pieces. The engineer concludes that material X is a metal, and material Y is a nonmetal.
Which statement correctly supports the conclusion made by the engineer?
Responses
- A. Metals are hard, and nonmetals are soft.
- B. Metals are ductile, and nonmetals are brittle.
- C. Metals are malleable, and nonmetals are brittle.
- D. Metals are lustrous, and nonmetals are dull.
- C. Metals are malleable, and nonmetals are brittle.
300
A student has a full glass of water. The density of the water in the full glass is 1.0 g/mL. The student drinks half of the water in the glass.
What is the current density of the water remaining in the glass?
Responses
- a. 0.25 g/mL
- B. 0.5 g/mL
- C. 1.0 g/mL
- D. 1.5 g/mL
C. DENSITY DOES NOT CHANGE
300
Examine the equation.
Density = Mass divided by Volume
An object has a mass of 20 g and volume of 10 cm . Enter the numerical value for the density of the object.
20g/10cm = 2 g/cm3
300
A student mixes 15 g of baking soda and 50 g of vinegar in a beaker and immediately covers the beaker. The student lists observations in a chart.
Which observations are evidence of a chemical change?
A. 1 and 2
B. 1 and 3.
c. 2 and 4
D. 3 and 4
D. 3 and 4
300
The table below compares two cellular processes.
Based on the information in the table, which two processes are being compared?
A. growth and reproduction
B.osmosis and diffusion
C. decomposition and fermentation
D. photosynthesis and respiration
D. photosynthesis and respiration
300
Which process directly adds carbon into the atmosphere?
A.
increasing plant populations- B
decreasing animal populations
- C
burning fossil fuels
- D
forming sedimentary rock
C
burning fossil fuels
400
Students study how the temperature of a substance is related to the rate of molecular movement. The molecules in which substance are moving the fastest?
Acold milk
- B
warm soup
- C
water melting from ice
- D
steam rising from boiling water
D. steam rising from boiling water
400
The table lists the average pH of several fluids found in the human body.
Which body fluids can be classified as basic?,
Bile Juice = pH 8.05 = basic
400
What is an outcome that is common to all substances that undergo a chemical reaction?
A. The atoms of the substances are destroyed, creating energy.
B. The atoms of the substances are rearranged, forming a new substance.
C. The atoms of the substances remain bonded but spread apart, causing a gas to form.
D. The atoms of the substances remain bonded but move closer together, causing a solid to form.
B. The atoms of the substances are rearranged, forming a new substance.
400
What particle always has a mass of one atomic mass unit (amu) and no charge?
A. Neutron
B. Proton
C. Electron
D. Atom
A. Neutron
400
What most likely happens to soil when crops are not rotated from year to year?
A. The soil nutrients are depleted.
B. The soil fertility increases.
C. The soil becomes more porous.
D. The soil erodes less rapidly.
A. The soil nutrients are depleted
500
A researcher collects a sample of ocean water in a North Carolina estuary and tests its pH using the pH meter, as shown.
How should the sample of ocean water be described?
- A. It contains a high concentration of positive hydrogen ions.
- B. It contains a high concentration of negative hydroxide ions.
- C. It is relatively acidic.
- D. It is relatively neutral.
- D. It is relatively neutral.
500
Sodium bicarbonate (NaHCO3) is commonly known as baking soda. Sodium bicarbonate is a white solid that can dissolve in water. Under the proper conditions, sodium bicarbonate can release carbon dioxide (CO2) gas.
Select all of the physical properties of sodium bicarbonate.
Responses
- A
It is white.
- B
It is a solid.
- C
It can dissolve in water.
- D
It releases carbon dioxide.
- A
It is white.
- B
It is a solid.
- C
It can dissolve in water.
500
A student places an iron nail in a test tube with water for two weeks and sketches any observations.
The student concludes that the nail experiences a chemical change. Which statement supports the student’s conclusion?
A. The mass of the nail increases.
B. The nail changes its shape.
C. The state of matter of the nail changes.
D. The nail forms rust.
D. The nail forms rust.
500
The electrical charge of the nucleus of an atom is +12. How many electrons does the atom have in its neutral state?
A. 6
B. 8
C. 12
D. 25
C. 12 Negative electrons
500
After a person eats, the food is converted into energy by
A.muscles.
B. tissues.
C. bones.
D. cells.
D. cells.