Intro to Matter

Which statement describes a chemical property of sodium?

• It is silver in color.

• It has a density of 0.97 g/cm³ at room temperature.

• It has atoms with an atomic radius of 160 pm.

• It is highly reactive with water.

Which equation represents a physical change?

• H₂(g) + I₂(g) → 2HI(g)

• N₂(g) + 2O₂(g) → 2NO₂(g)

• I₂(s) → I₂(g)

• 3O₂(g) → 2O₃(g)

Tags

NGSS.MS-PS1-4

Which phrase describes a specific compound?

• can contain only one element

• can be physically separated into elements

• is composed of elements chemically combined in a definite ratio

• is composed of elements mixed in proportions that can vary

Which statement describes a chemical property of copper?

• Copper has a red-orange color.

• Copper can be flattened into sheets.

• Copper reacts with oxygen.

• Copper conducts an electric current.

Tags

NGSS.MS-PS1-2

Which two physical properties of matter describe a wire made of iron?

• It is a solid and it is magnetic.

• It is a liquid and it conducts heat.

• It is magnetic and it is an insulator.

• It is an insulator and it has a black color.

A sample is composed of two different substances that can be separated by using filter paper. This sample is classified as

• a heterogeneous mixture

• a homogeneous mixture

• a single compound

• an unsaturated solution

A 1.0-gram sample of NaCl(s) is dissolved in 100. grams of water at 25°C, and another 1.0-gram sample of NaCl(s) is dissolved in 50. grams of water at 25°C. Which property of the two resulting mixtures will be different?

• color of the components in the mixture

• particle size of the components in the mixture

• polarity of the components in the mixture

• proportion by mass of the components in the mixture

Which sample can be classified as a substance?

• air

• argon

• soil

• seawater

Compared to the chemical and physical properties of the compound CO, the compound CO₂ has

• the same chemical properties and the same physical properties

• the same chemical properties and different physical properties

• different chemical properties and the same physical properties

• different chemical properties and different physical properties

Which process represents a chemical change?

• Iodine sublimes.

• Water evaporates.

• An ice cube melts.

• A candle burns in air.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5