Question 1
Which of these is designed by researchers to test only a single prediction of a hypothesis at a time?
◦ controlled experiment
◦ experimental variable
◦ control group
◦ controlled variable
◦ experimental constant
Question 2
A bond that joins atoms that have opposite charges is a(n)
◦ covalent bond.
◦ hydrogen bond.
◦ ionic bond.
◦ coordinate covalent bond.
◦ polar covalent bond.