Question

question 2
which of these is an element?
steel
chlorine
sugar
plastic
question 3
which of the following will cause water to change to ice?
removing heat from the water
putting the water in sunlight
adding salt to the water
adding cold to the water

Explanation:

For Question 2, an element is a pure substance made of only one type of atom. Steel is an alloy, sugar is a compound, plastic is a polymer, while chlorine is an element from the periodic - table. For Question 3, water changes to ice through the process of freezing, which occurs when heat is removed from the water, causing the water molecules to slow down and arrange into a solid lattice structure.

Answer:

Question 2: B. chlorine
Question 3: A. removing heat from the water