Which step of the scientific method involves identifying variables?

a. analyzing data

b. testing a hypothesiss

c. asking a question

d. developing a theory

Where on the periodic table are the nonmetals located

What system maintains the ph of human blood at very near 7 ... 4

What is frequency and what unit is it measured in?

Which scientist began organizing elements into the periodic table? A. Alfred wegener B. Sir Francis bacon C. Dmitri mendeleev D. Sir issac Newton

Fe2O3 is the major component in rust. How many atoms are in one molecule of rust? A. 1 B. 2 C. 3 D. 5

When a cell is in late anaphase of mitosis, which of the following will we see?

What is the reactant (s) in the chemical equation below? 2Al (s) + 2NaOH (aq) + 2H2O () 2NaAlO2 (aq) + 3H2 (9) A. 2Al (s) + 2NaOH (aq) + 2H200) B. 2NaAlo2 (aq) + 3H2 (g) C. 2Al (s) D. 3H2 (g)

In an oil spill, why does the oil not mix with the sea water? A. Lipids are hydrophobic B. Lipids are hydrophilic. C. Lipids are saturated. D. Lipids are unsaturated.

What mass of KCL is contained in. 350 M solution of KCL?

Given the balanced equation: 3fe3 + (aq) + al (s) → 3fe2 + (aq) + al3 + (aq) what is the total number of moles of electrons lost by 2 moles of al (s) ?