Which of the following rocks would probably be made up of the largest

mineral grains?

(granite, scoria, pumice, basalt)

Why is it hard for scientists to change lead into gold? Scientists would have to change the number of protons in lead atoms. Scientists would have to change the number of electrons in lead atoms.

Name the layers of earth in order from most dense to least dense.

Approximately how many natural forming elements are there

Synthesize What environmental effects are shared by all fossil fuels?

Why is frying an egg an example of a chemical change? A. atoms are lost during the reaction as bonds are broken B. atoms are gained during the reaction as new bonds form C. the products have different properties than the reacts D.

Which pair of nitrogen bases will form a bond in a DNA molecule? a. cytosine and adenine b. adenine and thymine c. guanine and thymine d. thymine and cytosine

Most meteors that fall into the earths atmosphere burn up before reaching the ground. Why is this?

Imagine a chemist is in the lab and trying to make some chemical reactions happen. In one reaction she reacts chemicals in an exothermic reaction and there is an increase in entropy.

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

Type of ion formed by group 2A elements