WCAS 11

Look into the sky on a clear night and you may be able to observe the Moon, or part of it, lit up by the Sun. People can keep track of the Moon's appearance from Earth in lunar calendars. This makes it easy to see how the appearance of the Moon changes over time. A student made the following lunar calendar for 16 days, but it was cloudy on several nights.

A student is studying the partial lunar calendar. Which sequence of moon phases correctly represents the pattern in the appearance of the moon and completes the calendar?

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Tags

NGSS.MS-ESS1-1

The diagram below represents the saltwater solution made by the student. When salt (NaCl) molecules are added to water (H2O), they break into one sodium (Na) particle and one chlorine (Cl) particle.

Chose the name of the solvent and solute

• Solute = H2O Solvent=NaCI

• Solvent = H2O Solute= NaCl

Tags

NGSS.MS-PS1-1

A student needs to separate a mixture compsed of iron fillings and sand. How can the student most easily separate all the iron fillings from the mixture?

• Use a magnet to attract the iron filings

• Use filter paper to isolate the iron filings

• Add water to the mixture and pour off the floating iron filings.

• Add water to the mixture and allow it to evaporate and leave behind the iron filings

A student is identifying properties of chemical particles by using the chart below. Complete the chart by selecting boxes to identify each property as a description of an atom, a molecule, or both

Properties of Particles

Which are particles held together by bonding?

• atom

• molecule

Tags

NGSS.MS-PS1-1

Which statement identifies the most likely outcome if the rabbit population suddenly reduced?

• Owls would become extinct because they have no food

• Hawks would have less food available so their population would decrease

• Grasshoppers would have less food available so their population would decrease

• Grasses in the area would die and all of the animals would have to move to another area to survive

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4

the chart below shows environmental characteristics of four ecosystems Which statement accurately describes the vegetation or animals that would be best supported by the ecosystem?

• the desert would support animals that need to remain cool

• the pond would support animals that can survive in saltwater environment

• the tropical rainforest would support plants that are tall and have then needles

• the polar tundra would support plants that are small and grow close to the ground

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The diagram shows four blocks of the same size in a water tank. Block Y has the same density as the water.

Four additional block are being added to the water as detailed (Block J= 1kg) - (Block K =3 kg)- (Block L=5 kg)-(Block M=7kg)

Pick two answers choices - the two blocks that will float and two blocks that will sink.

• BLOCK J & K WILL FLOAT

• BLOCK J & K WILL SINK

• BLOCK L & M WILL SINK

• BLOCK L & M WILL FLOAT

What is the primary method to separate a mixture of salt and water?

• Evaporation

• Filtration

• Magnetism

• Decantation

Which of the following is a chemical change?

• Melting of ice

• Rusting of iron

• Boiling of water

• Breaking of glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the chemical formula for table salt?