True or false: if half of a radioactive substance decays in the first 10 s, the other half will decay in the next 10 s.

Which words or phrases describe gneiss? Check all that apply. A. Igneous B. Metamorphic C. Tends to split along bands D. Grains randomly arranged E. Forms under heat and pressure

for the hypothetical reaction 2A B - > 2C D, the initial rate of disappearance of A is 1.6x10^-1 mol / (L s). what is the initial rate of disappearance of B

On a trip to an animal farm, Pete saw a black horse with two colts: one spotted colt and one black colt. Which statement BEST describes what Pete sees? A) Offspring may or may not look like one parent.

A cup can hold 50 ml of water and has a mass of 25g. If each penny weighs 2g, how many pennies can it hold before it sinks in fresh water? Explain how you got your answer.

What occurs when potassium reacts with chlorine to form potassium chloride?

When magnesium combines with oxygen, the reaction involves a. a conversion of protons into electrons. b. sharing of electrons between Mg and O. c. transfer of electrons from Mg to O. d. transfer of electrons from O to Mg.

The activation energy for the reaction no2 (g) + co (g) ⟶no (g) + co2 (g) is ea = 100 kj/mol and the change in enthalpy for the reaction is δh = - 375 kj/mol.

What process transform solar energy into chemical energy?

When the reaction was carried out the calculated theoretical yield for water was 176 grams but the measured yield was 148 grams what is the percent yield

For an atom's electrons, how many energy sublevels are present in the principal energy level n = 4?