Unit 2

Jessica was taking a walk with her friends. She looked down and saw two unknown minerals. When she dragged them across the sidewalk, she noticed that they produced the same color mark, but one scratched the other. What conclusion could Jessica draw?

• Their hardness and streaks are the same.

• Their hardness is the same, but their streaks are different.

• Their hardness is different, but their streaks are the same.

• Their streaks are the same, but their luster is different.

Shannon was researching the element silver for her project about atoms. She recorded her notes on index cards as shown: Which of the index cards above include information about silver’s physical properties? Select 2 correct answers

• Index card A

• Index card B

• Index card C

• None of the above

A student tests the properties of an element and finds that it is malleable, shiny, and conducts electricity. Based only on the student’s data, this element is most likely a –

• magnet

• metal

• non metal

• metalloid

Based on the data in the table, which of these elements should be classified as metals?

• Carbon and sulfur

• Carbon and iodine

• Cobalt and iodine

• Cobalt and silver

Which of the following statements is supported by evidence in the table?

• Metals are not attracted to magnets.

• Metals conduct electricity.

• Nonmetals are attracted to magnets.

• Nonmetals are malleable.

Tags

NGSS.MS-PS1-2

Determine the density of a material that has a mass of 100 grams and a volume of 20 mL.

Answer explanation

Please make sure you include units!

Make sure you divide 100g by 20 ml

Students were given four unknown substances and asked to observe their characteristics. Their observations are shown in the table below: Which of the unknown substances is most likely a metal?

• 1

• 2

• 3

• 4

The mass of an unidentified rock is 15.5 grams. Students determine the volume of the rock by placing the rock in a cylinder with water. The students calculate the density of the rock. They determine the identity of the rock based on the density ranges in the table. The students most likely have which type of rock?

Answer explanation

This is a two step problem

Based on the data in the table, which of these elements should be classified as metals?

• Carbon and sulfur

• Carbon and iodine

• Cobalt and iodine

• Cobalt and silver

Which of the following statements is supported by evidence in the table?

• 1. Metals are not attracted to magnets.

• Metals conduct electricity.

• Nonmetals are attracted to magnets.

• 1. Nonmetals are malleable.

Tags

NGSS.MS-PS2-3