Which of the following statements best describes the properties of aluminum-28?

a. aluminum-28 has a higher percent abundance in nature than aluminum-27.
b. aluminum-28 has one more proton than aluminum-27.
c. when aluminum-28 undergoes beta-decay, magnesium-28 is produced.
d. when aluminum-28 undergoes beta decay, silicon-28 is produced.

Consider the balanced equation below. n2h4 + 2h2o2 n2 + 4h2o what are the mole ratios of hydrazine (n2h4) to hydrogen peroxide (h2o2) and hydrazine to water? 1: 2 and 1: 4 1: 3 and 1: 4 1: 2 and 3: 5 1: 3 and 3: 5

Mrs. smith ordered a root beer float (vanilla ice cream + root beer). mrs. smith noticed that the three states of matter (solid, liquid, and gas) all existed simultaneously in her root beer float. a. identify each phase of matter in the root beer float. b. describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? ) c. identify one phase change you would see in a root beer float and described what causes this change.

Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know