7. In a double covalent bond,

a. one atom has more than eight valence electrons.

b. one atom loses à pair of electrons.

c. two atoms shåre eight valence electrons.

d. two atoms share two pairs of electrons.

What is the difference between bacteria and eukarya

The word elliptical refers to what type of shape?

Which of the following requires the most input of energy? A. melting a substance B. raising the temperature of the substance by 1° C C. decreasing the temperature of the substance by 1° C D. vaporizing a substance

What is the change in atomic mass number when an atom emits an alpha particle?

A 5.00L reaction vessel is filled with 1.00mol of H2, 1.00mol of I2, and 2.50mol of HI. If equilibrium constant for the reaction is 129 at 500k, what are the equilibrium concentrations of all species?

The specific heat of aluminum is 0.897 J/g•°C. Which equation would you use to calculate the amount of heat needed to raise the temperature of 0.75 g of aluminum from 7°C to 29°C? A. Q = 0.75 g x 0.897 J/g•°C x 22°C B. Q = 0.75 g x 0.

Carbon dating advisable for measuring materials ages for a few years, thousands of years, millions of years

What is the pH of a solution with [H+] = 7.0 x 10^-2?

A compound is a pure substance made of 2 or more types of elements that are chemically bonded True or false

In a chemical reaction, 300 grams of reactants are combined with 100 grams of reactant b. both a and b react to completion. how much will the product weigh