Matter, periodic table, and atomic structure

Charlotte, Harper, and Isla are discussing the two most important properties of all matter while studying for their science exam. According to their textbook, what are these two properties?

• taking up space and having mass

• being brittle and hard

• being malleable and ductile

Answer explanation

The two most important properties of all matter are taking up space and having mass. These properties define the fundamental nature of matter.

Daniel, Ava, and Harper are in a science class. Their teacher explains that an atom is

• the smallest unit of matter that maintains its chemical identity

• always made of carbon

• smaller than an electron

David, Avery, and Mason are in a science class. Their teacher explains that a compound is

• a pure substance that cannot be broken down into simpler, stable substances

• a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances

• any substance, whether it is chemically bonded or not

Harper, Lily, and Michael were helping Aiden, William, and Hannah with their science project. They were experimenting with different activities: Harper was cutting a piece of paper, Lily was boiling water, and Michael was burning wood. Which of these activities is not a physical change?

• cutting

• boiling

• burning

Anika, Emma, and Aiden were discussing their science project on chemical changes. They were considering rusting of an old bicycle, melting of ice cream, and burning of a paper as examples. Which of these examples does not represent a chemical change?

• rusting of an old bicycle

• melting of ice cream

• burning of a paper

During a science experiment, Maya observed a leaf changing color in the fall. Abigail suggested that this is a chemical change. Is Abigail correct?

• No, a chemical change occurs when dissolved minerals solidify to form a crystal

• No, a chemical change occurs when salt deposits form from evaporated seawater

• Yes, a leaf changing color in the fall is a chemical change

Benjamin, Anika, and Evelyn were at a party. Benjamin poured some juice into a glass for Anika. How would you describe the juice in the glass that Benjamin poured for Anika?

• having definite shape and definite volume

• having neither a definite shape nor a definite volume

• having a definite volume but not a definite shape

William, Michael, and Abigail are in a science class discussing about units of measurement. They are given a list of terms: mass, kilometer, and gram. They all agree that these are units of measurement except one. Which one is it?

• mass

• kilometer

• gram

William is working on a science project and he needs to measure the thickness of a paper. He sees the symbol "mm" on his ruler. What does "mm" represent?

• micrometer

• millimeter

• meter

William, Liam, and Kai are participating in a race. They are asked to measure the race track using different units of length. Arrange the units of length they used from largest to smallest.

• m, cm, mm, km

• mm, m, cm, km

• km, m, cm, mm