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.

A certain reaction is zero order in reactant a and second order in reactant b. if concentration of both reactants are doubled, what happens to the reaction rate?

The pedigree represents how a certain sex-linked recessive trait is inherited. Which is the most likely genotype of the grandfather? XdY XDXd XDY XdXd

In the hospital, 35 babies were born. If 22 were boys, what percentage was boys. Express your answer in places

What is the speed at which molecules or atoms move dependent on temperature and state of matter?

Which statement best describes a reaction mechanism in chemistry? simple steps in a chemical reaction that add up to the overall reaction simple steps in a chemical reaction that add up to the rate law a method for showing the way in which an

Which of the following represents a chemical change? Bending a wire Freezing of water Fireworks exploding Melting of a wax candle

5.00 L of a gas is collected at 100K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure? A. 400 °C B. 127 °C C. 223 °C D. 627°C

Before the initial explosion was the matter hot or cold

Which of the following atoms has seven valence electrons? chlorine (Cl) nitrogen (N) manganese (Mn) oxygen (O)

A.) During an experiment, a student adds 2.90 g of CaO to 400.0 mL of 1.500 M HCl. The student observes a temperature increase of 6.00 °C. Assuming the solution/'s final volume is 400.0 mL, the density if 1.00 g/mL, and the heat capacity is 4.