Staar practice

Which of the particles in the chart is a neutron?

• Particle A

• Particle B

• Particle C

• Particle A and B

Which statement is correct about protons and valence electrons?

• The number of valence electrons determines the identity of the element, while the number of protons determines its reactivity.

• The number of valence electrons plus the number of protons is equal to the atomic mass of an element.

• The number of protons minus the number of valence electrons is equal to the number of neutrons

• The number of protons determines the identity of an element, while the number of valence electrons determines its reactivity.

Which list of characteristics best describe the properties of neon, argon, and krypton?

• Conducts heat and electricity, shiny, and solid

• Brittle metalloids, reactive with oxygen, and melt at low temperatures

• Gaseous at room temperature and chemically stable

• Magnetic, highly reactive, and flammable

What is the net force acting on this balloon?

• 7N to the right

• 10N to the right

• 6N to the left

• 4N to the right

The Earth is tilted at an angle of 23.5º relative to its position to the Sun.

The tilting of the Earth on its axis contributes to:

• The different phases of the moon we see

• The changing of seasons

• High and low ocean tides

• An increase in the gravitational force from the Sun

Karen observes the moon phase to be waxing gibbous. What is the next moon phase to occur?

• Waning Gibbous

• Full Moon

• Waxing Crescent

• New Moon

The Hertzsprung Russell diagram is labeled with specific stars.

Based on the diagram, which of the following is a true statement?

• Betelgeuse, Antares, and Aldebaran are white dwarfs.

• The Sun is hotter and brighter than Spica.

• Regulus, Sirius A, and Procyon are all on the main sequence

• Sirius B is a red giant.

Some parts of the Himalayas are growing as much as 1cm/year. What is causing the fast, vertical growth?

• A Subduction zone is near the mountain chain.

• Huge underground geysers create pressure to push the mountains higher

• Sediments from eroded materials are being deposited on top of the mountains

• Two continental plates are colliding

How might clearing forest areas for the construction of factories potentially affect the stability of the carbon cycle?

• A greater amount of oxygen will be released into the atmosphere by the construction of the factories while a decreased amount of carbon dioxide is produced by the remaining forest areas.

• A lesser amount of carbon dioxide will be taken in and used for food production by forests while more carbon dioxide is produced by factories.

• The amount of carbon dioxide available for photosynthesis in the remaining forest areas will be decreased due to the construction of factories.

• The amount of oxygen in the atmosphere available for animal respiration will likely increase due to deforestation.

The arctic hare in the picture is shown camouflaged in the snow from possible predators.

What would happen if the arctic hare was introduced into a new environment without snow and ice?

• The species would become overpopulated.

• The chance of young hares surviving to adulthood and reproducing would be greatly diminished.

• The hare would be a popular target for game hunters.

• All of the above.