8th Grade Science STAAR Online

The atomic number of krypton is 36. If the mass number of a krypton atom is 84, which table shows the number of subatomic particles inside and outside the nucleus of the krypton atom?

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Tags

NGSS.MS-PS1-1

A basketball with a mass of 0.60 kg is accelerated with a force of 10.8 N. If resisting forces are ignored, what is the acceleration of the basketball to the nearest m/s²? Type your answer as a whole number ONLY. DO NOT INCLUDE UNITS SUCH AS M/S².

Tags

NGSS.MS-PS2-2

Wild hogs introduced to Texas from Europe became feral after the hogs escaped from the ranches where they lived. Feral hogs are omnivores that feed on native plants, crops, and small animals. Feral hogs can damage an ecosystem by rooting through the soil to look for food in trampling small plants. Which types of native organisms do feral hogs most likely compete with for food sources?

• Carnivores and producers

• Herbivores and carnivores

• Producers and decomposers

• Decomposers and herbivores

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

The spectral classes of four stars are shown in comparison with a Hertzsprung-Russell diagram.

Based on the information, which star is most like the sun?

• Star 1

• Star 2

• Star 3

• Star 4

Tags

NGSS.HS-ESS1-1

The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below.

Which of these elements is in this group?

• Lithium

• Strontium

• Aluminum

• Silicon

A student walks 2 km in 30 minutes. What is the students average speed in km/h? Type your answer as a whole number ONLY. DO NOT INCLUDE UNITS SUCH AS km/h.

Strontium phosphate, Sr₃(PO₄)₂, is a crystalline substance used in medicine and Industry. How many oxygen atoms are represented in the formula for Sr₃(PO₄)₂? Type your answer as a whole number ONLY.

Tags

NGSS.MS-PS1-1

What are the main functions of the human skeletal system?

• To support the body, protect the organs, produce blood cells, and store calcium

• To regulate the composition of body fluids by removing metabolic wastes and retaining a balance of water, salt, and other nutrients

• To regulate and maintain bodily functions by producing hormones and releasing them into the bloodstream

• To enable the diffusion of oxygen into the bloodstream and the removal of carbon dioxide from the bloodstream

An environmental change drastically reduced the population of milkweed plants in an area. The milkweed plants provided the only source of food for a nearby population of monarch butterfly caterpillars.

Which statement describes the most likely effect of this environmental change on this population of monarch butterflies?

• The number of monarch butterflies will decrease because their caterpillars will not have enough food.

• The number of monarch butterflies will stay the same because butterflies reproduce so rapidly their populations can withstand most food shortages.

• The number of monarch butterflies will stay the same because their caterpillars will begin consuming nectar from different types of flowers.

• The number of monarch butterflies will increase because their reproduction rate will increase to ensure some individuals survive.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The diagram below shows a sled moving along smooth, frictionless track.

In which sections of the track will the slide experience an unbalanced force?

• Sections 1 and 3

• Sections 2 and 3

• Sections 2 and 4

• Sections 3 and 4

Tags

NGSS.MS-PS2-2