S8P1 Review

Front

A sample of two or more atoms chemically combined held together by bonds

Back

a molecule

Answer explanation

A molecule is defined as a sample of two or more atoms chemically combined and held together by bonds. This distinguishes it from elements, which consist of a single type of atom, and mixtures, which are combinations of substances.

Tags

S8P1e

Front

Which boxes contain any molecules? Options: Only box C, Boxes C, F and I, Boxes A, D and I, Boxes A, C, D and I, Boxes B, E, G, H

Back

Boxes C, F and I

Answer explanation

Boxes C, F, and I contain molecules, as indicated by their contents. The other options include boxes that do not have any molecules, making this the correct choice.

Tags

NGSS.MS-PS1-1

Front

Which list below contains ONLY chemical properties of matter?

• Melting Point, color, reactivity
• Density, Boiling Point, Malleability
• Reactivity, flammability, pH
• Heat of combustion, luster, color

Back

Reactivity, flammability, pH

Answer explanation

The correct choice, 'Reactivity, flammability, pH', includes only chemical properties. Melting point, density, and color are physical properties, while malleability and heat of combustion also do not fit the criteria.

Front

What does it demonstrate when a frozen drink turns to liquid after being left on the counter?

Back

a physical change

Answer explanation

Mrs. Rejmer's Freezie turning from solid to liquid demonstrates a physical change, as it involves a change in state without altering the substance's chemical composition.

Tags

NGSS.MS-PS1-4

Front

What does baking a cake demonstrate?

Back

a chemical change

Answer explanation

Baking a cake involves mixing ingredients and applying heat, resulting in new substances and changes in chemical composition. This process exemplifies a chemical change, as opposed to physical changes that do not alter the substance's identity.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Mass of products in a closed system if 100 g of reactants are used?

Back

100 g exactly because reactants and products have the same mass

Answer explanation

In a closed system, the law of conservation of mass states that mass is neither created nor destroyed. Therefore, the mass of the products will be exactly 100 g, the same as the mass of the reactants.

Tags

NGSS.MS-PS1-5

Front

Which diagram(s) models a pure substance?

Back

i and iv

Answer explanation

Diagrams i and iv represent pure substances as they show uniform composition and properties throughout. In contrast, the other diagrams depict mixtures or compounds, which do not qualify as pure substances.

Tags

NGSS.MS-PS1-1

Front

Which diagrams are modeling mixtures?

Back

ii, iii, v, and vi

Answer explanation

Diagrams ii, iii, v, and vi represent mixtures as they show combinations of different substances. The other options do not depict mixtures accurately, making this the correct choice.

Front

Which scenario would BEST explain the phase change shown in the picture?

• A pot of water boils and forms steam.
• Pond water freezes on a cold winter day.
• Water droplets form on grass on a cool morning.
• Snowman melts on a sunny day.

Back

Snowman melts on a sunny day.

Answer explanation

The scenario of a snowman melting on a sunny day best explains the phase change, as it involves solid snow turning into liquid water due to heat, illustrating a transition from solid to liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Front

A gas typically consists of:

Back

high energy particles that experience little attractive force between them

Answer explanation

A gas consists of high energy particles that move freely and experience little attractive force between them, allowing them to fill their container. This distinguishes gases from liquids and solids, where particles are more closely packed.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5