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Which statement best identifies a solid? (SC.8.P.8.1.)

• Particles barely move and are tightly packed.

• Particles barely move and are farther apart.

• Particles move more quickly and are farther apart.

• Particles move more quickly and are tightly packed.

How does the picture relate to the particles in a solid?

• The cars are driving fast and switching lanes like the particles in a solid.

• The cars are sliding past each other while driving the speed limit like the particles in a solid.

• The cars are moving so fast you cannot even see them like the particles in a solid.

• The cars are barely moving like the particles in a solid.

Brandon dissolved 10 grams of salt in 100 mL of water to form salt water. He then boiled the solution and the water boiled away. How much salt would be left in the beaker? (SC.8.P.9.1)

• gram

• grams

• grams

• grams

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

1. Which statement best identifies which of these models is a liquid? (SC.8.P.8.1)

• Diagram A is a liquid, because its particles move the slowest and are tightly packed.

• Diagram B is a liquid, because its particles move at a medium speed, and are sliding past each other.

  C.

• Diagram C is a liquid, because its particles move the fastest and bounce all over the place.

• Diagram A and B are both liquids, because the particles are always touching.

Tags

NGSS.MS-PS1-4

C6H12O6 is the chemical formula for glucose, a type of sugar. Which statement is true about glucose?

• Glucose is an element, because it can be separated into smaller components.

• Glucose is an element, because it is made up of more than one kind of atom.

• Glucose is a compound, because it is made of more than one element.

• Glucose is a compound, because it is made of protons, neutrons, and electrons.

Tags

NGSS.MS-PS1-1

A student has a sample of an element. Which describes a trait the sample must have in order to be considered an element?

• The sample is a liquid at room temperature.

• The sample is made of only one type of atom.

• The sample contains different types of particles

• The sample can be seen only with a microscope.

The periodic table of the elements organizes elements according to their properties. A section of the periodic table is shown.

Which set of elements below is the most similar in chemical behavior?

• H, Be, Sc

• Fr, Ra, Rf

• Ti, V, Cr

• Be, Ca, Ra

All atoms of an element have in their nuclei the same number of...

• electrons

• isotopes

• molecules

• protons

Atoms and molecules combine to form all the matter we see in our universe. They have unique identities that characterize them and separate them from one another. Atoms can bond together to make larger samples of matter, such as compounds. Atoms are also found in mixtures. Which statement correctly contrasts a compound and a mixture?

• A compound is made of a fixed ratio of two or more elements chemically combined, and a mixture can contain two or more compounds physically combined.

• A compound contains two or more elements that are physically combined, and a mixture contains two or more compounds that are chemically combined.

• A mixture combines to form a compound that cannot be separated physically, and a compound displays physical characteristics of the mixture.

• A compound and mixture differ in the number of elements they contain, and both cannot be separated physically or chemically.

Which of these statements correctly describes the trends when moving from left to right within the period from sodium to chlorine?

• The number of valence electrons increases, and the atomic radius increases.

• The number of valence electrons increases, and the atomic radius decreases.

• The number of valence electrons decreases, and the atomic radius increases.

• The number of valence electrons decreases, and the atomic radius decreases.