Chemical Formulas 1. What does the subscript 2 stand for following the H in H2O?

2. List the atoms that would be found in a molecule of CO2.

3. Why are models used to explain the composition of substances?

4. What can models show us specifically about the makeup of substances on the atomic level?

5. Why are formulas used to describe substances?

6. What does the formula tell us about a substance?

How does an angiosperm prevent self pollination

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a.the offspring are more likely to have freckles. b.the offspring are more likely to have no freckles. c.the likelihood of the offspring having freckles and not having freckles is the same. d.the likelihood of the offspring having freckles and not having freckles cannot be determined.

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls