Exit Ticket: Metals, Nonmetals, Metalloids, Chemical Changes

Which of the following is a characteristic of metals on the periodic table?

• They are generally brittle.

• They are good conductors of electricity.

• They are poor conductors of heat.

• They are usually gases at room temperature.

Answer explanation

Metals are known for being good conductors of electricity due to their free-moving electrons. This characteristic distinguishes them from nonmetals, which are generally poor conductors.

Identify the element that is a nonmetal from the following list.

• Iron (Fe)

• Oxygen (O)

• Silicon (Si)

• Aluminum (Al)

Answer explanation

Oxygen (O) is a nonmetal, while Iron (Fe), Silicon (Si), and Aluminum (Al) are metals or metalloids. Nonmetals are typically found on the right side of the periodic table, and oxygen is a key example.

Which of the following is evidence of a chemical change?

• Melting of ice

• Dissolving sugar in water

• Production of a gas

• Breaking a glass

Answer explanation

Production of a gas indicates a chemical change, as it often involves a reaction between substances. In contrast, melting ice, dissolving sugar, and breaking glass are physical changes.

Tags

NGSS.MS-PS1-2

What is a common property of metalloids?

• They are all gases at room temperature.

• They have properties of both metals and nonmetals.

• They are excellent conductors of electricity.

• They are highly reactive with water.

Answer explanation

Metalloids exhibit a mix of properties from both metals and nonmetals, making them unique. They are not all gases, are not excellent conductors like metals, and their reactivity with water varies, unlike the statement suggests.

Which of the following scenarios indicates a chemical change has occurred?

• Water boiling

• A color change in a solution

• Salt dissolving in water

• Ice melting

Answer explanation

A color change in a solution indicates a chemical change, as it often signifies a new substance has formed. In contrast, boiling water, dissolving salt, and melting ice are physical changes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Classify the following element as a metal, nonmetal, or metalloid: Silicon (Si).

• Metal

• Nonmetal

• Metalloid

• Rare Earth Element

Answer explanation

Silicon (Si) is classified as a metalloid because it exhibits properties of both metals and nonmetals. It is a good conductor of electricity and has a shiny appearance, characteristic of metalloids.

A student observes a reaction where a solid forms in a liquid solution. What type of change is this an example of?

• Physical change

• Chemical change

• Phase change

• No change

Answer explanation

The formation of a solid in a liquid solution indicates a chemical change, as it often results from a reaction between substances, leading to new products. This is distinct from physical or phase changes, which do not create new substances.

Tags

NGSS.MS-PS1-2

Which of the following elements is most likely to be a good conductor of electricity?

• Sulfur (S)

• Carbon (C)

• Copper (Cu)

• Neon (Ne)

Answer explanation

Copper (Cu) is a metal known for its excellent electrical conductivity due to its free-moving electrons. In contrast, sulfur, carbon, and neon are poor conductors, making copper the best choice for conducting electricity.

Tags

NGSS.HS-PS1-1