Why is a control group important in an experiment?

What energy form is a bow and arrow?

A student wants to compare how easily a metal and a plastic spoon of the same temperature can transfer thermal energy. Which of the following activities should the student perform? Measure the effort required to bend each spoon.

Which of the following elements has the lowest electronegativity? C F Li O

The net charge on a sulfide ion (s2-) explain how this ion obtains its charge your answer should include a discusion of subatomic particles

10.1 g CaO is dropped into a styrofoam coffee cup containing 157 g H2O at 18.0°C. If the following reaction occurs, then what temperature will the water reach, assuming that the cup is a perfect insulator and that the cup absorbs only a negligible

What are the basic building blocks of matter? A) molecules B) atoms C) electrons D) compounds

How does an atom with too few neutrons relative to protons undergo radioactive decay? * by converting proton to a neutron by converting a neutron to a proton by emitting an alpha particle

What is the chemical formula for the compound formed between sodium and iodine?

8. Write a balanced chemical equation showing how you could prepare each of the following salts from an acid-base reaction: KNO3, NaBr, and Cas.

Is calcium carbonate a compound element or mixture?