Smallest to largest: biome, population, organism, ecosystem, community

Which of the following chemical reactions is an oxidation-reduction reaction? a. CuSO4 + BaCl2 yields BaSO4 + CuCl2 b. Pb (NO3) 2 + 2NaCl yields PbCl2 + 2NaNO3 c. N2 + 3H2 yields 2NH3 d. K2SO4 + BaCl2 BaSO4 + 2KCl

A space probe identifies a new element in a sample collected from an asteroid. Successive ionization energies (in attojoules per atom) for the new element are shown below. I1 I2 I3 I4 I5 I6 I7 0.507 1.017 4.108 5.074 6.147 7.903 8.

Helium decays to form lithium. 6 2 He → 6 3 Li + 0 -1 e This type of nuclear decay is called. its B on edge

What are Chemical Structures?

The physical state of water at 100 degreeC (or 373K) ?

A college student driving to classes produces 8000 kg of carbon dioxide (CO2) in a year, contributing to global warming. What volume of CO2 is produced? (The density of carbon dioxide is 2.0 g/L.)

For the first five steps of glycolysis, the appropriate sequence of enzymes is: A. phosphofructokinase-1 (PFK-1). B. hexokinase / glucokinase. C. fructose bisphosphate aldolase. D. Phosphoglucoisomerase. E. triose phosphate isomerase (TPI). a.

2NO + O2 → 2NO2 What type of chemical reaction is shown above? a combustion reaction b double displacement C synthesis d decomposition e single displacement

Why did Bromophenal solutions change from yellow to blue (what chemical reaction happended) ?

How many milliliters of calcium, with a density of 1.55 g/mL, are needed to produce 85.8 grams of calcium fluoride in the single replacement reaction below? Show all steps of your calculation as well as the final answer.