Physical and Chemical Changes in Matter

in a beaker. After a few moments, they noticed that the beaker became warm to the touch. Bubbles began to form and rise to the surface, and a yellow solid appeared at the bottom of the beaker. The students carefully recorded their observations in their science notebooks. Based on the students’ observations, which evidence BEST supports that a chemical change occurred?

• The beaker was made of glass

• The liquids were both clear before they were mixed

• The beaker became warmed and bubbles formed

• The student wrote their data in a notebook

Tags

NGSS.MS-PS1-2

A student left a bicycle outside for several months. Over time, a reddish-brown coating appeared on the metal parts of the bike. Which evidence shows that a chemical change occurred?

• The bicycle is still the same size

• The metal parts feel colder in the morning

• A color changed formed on metal surface

• The tires lost some air

Tags

NGSS.MS-PS1-2

While camping, you make a snack over a campfire. You roast a marshmallow over the campfire until it is browned and put it between some chocolate and graham crackers. When you take a bite, you notice that the chocolate and marshmallow have melted slightly. Which correctly identifies a part of this process as a physical or a chemical change?

• Physical Change

• Chemical Change

• Neither physical or chemical

• Both physical and chemical

Tags

NGSS.MS-PS1-2

Which statements correctly compare metals and nonmetals?

• Metals are dull and brittle. Nonmetals are shiny adn malleable

• Metals tend to be good conductors of thermal energy. Nonmetals tent to be good insulators of thermal energy

• Metals are good insulators of electricity. Nonmetals tent to be good conductors of electricity

• Metals cannot be stretched into thin wires. Nonmetals can be stretched into thin wires.

Tags

NGSS.MS-PS3-3

Look at the table and based on these properties, which element is most likely a nonmetal?

• element 1

• element 2

• element 3

• element 4

An element has these properties:

• is ductile

• has a shiny luster

• is solid at room temperature

• is a good conductor of thermal energy

Which element has the properties listed?

• Neon (Ne)

• Arsenic (As)

• Palldium (Pd)

• Silicon (Si)

Students examined the properties of five different elements and recorded observations about their properties in the table. Based on the students' observations, classify each sample as a metal, nonmetal, or metalloid. Which of these samples is a metalloid?

• Sample 1

• Sample 2

• Sample 3

• Sample 4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Students examined the properties of five different elements and recorded observations about their properties in the table. Based on the students' observations, classify each sample as a metal, nonmetal, or metalloid. Which of these samples are metals?

• samples 1,2,3

• samples 2,3,4

• samples 1,3,5

• samples 3,4,5

Some students added a food coloring to a sample of liquid hexane and a different food coloring to a sample of glycerin. The students then poured the liquid hexane, some water, and the glycerin into a graduated cylinder as shown below. Based on the drawing, which statement is a valid conclusion about the density of the three substances?

• Hexame is denser than water, and wate is denser than glycerin

• Water is denser than hexane, and hexane is denser than glycerin

• Water is denser than glycerin, and glycerin is denser than hexane

• Glycerin is denser than water, and water is denser than hexane

Tags

NGSS.MS-PS1-2

The diagram shows a tank of fluid with an ice cube at the bottom. Which best explains why the ice cube sank in the liquid?

• The liquid is more dense than the ice

• The ice cube is colder than the liquid

• The liquid is less dense than the ice

• The ice cube is in water