Question

1. which of the following is not a pure substance? a. helium b. carbon dioxide c. seawater d. glucose 23. peter places six balls of modeling clay on one side of a balance. he places a cup on the other side. it takes 41 plastic cubes to balance the modeling clay. he then removes the clay, shapes it into a dinosaur, and puts it back on the balance. how many cubes will he likely need to put into the cup to balance the dinosaur? a. 35 b. 38 c. 41 d. 47 24. the following illustration shows a tool that can be used to separate elements certain mixtures. this tool can separate what type of mixture?

Explanation:

22.

A pure substance has a fixed composition. Helium is an element, carbon dioxide is a compound, and glucose is a compound. Seawater is a mixture of water, salts, and other substances.

The mass of the clay does not change when its shape is changed. Since it took 41 plastic cubes to balance the clay in ball - form, it will take the same number of cubes to balance it when shaped into a dinosaur.

Answer:

c. Seawater

23.