Which of the following is always true when a substance undergoes a physical change?

a. the composition changes.

b. a change in color occurs.

c. no new substance is formed.

d. its specific gravity remains the same.

What is the molar ratio of methionine to glycine in the samples?

In a given chemical reaction, the energy of the products is less than the energy of the reactants. Which statement is true for this chemical reaction? A. Energy is absorbed in the reaction. B. Energy is released in the reaction. C.

Fusion is a type of

A thickness of a material is a factor that affects heat conductivity. Does heat flow faster through a thick or a thin piece of the same material? The surface area of a material is a factor that affects heat conductivity.

If the rate-determining step limits the speed of a reaction, which statement is correct? Even if one or more fast steps occur in a reaction, the overall reaction cannot proceed any faster than the slowest step.

How many daughter cells are produced in meiosis?

Sodium chlorite - > sodium chloride + oxygen what type of chemical reaction is represented by this equation

The mixing of which pair of reactants will result in a precipitation reaction? the mixing of which pair of reactants will result in a precipitation reaction?

A balloon has 18.9 moles of hydrogen gas at a volume of 428 L. What would the volume of the gas be if the balloon had 14.0 moles of hydrogen gas left after 1 day?

An analytical chemist is titrating 242.5 mL of a 1.200 M solution of hydrazoic acid HN3 with a 0.3400 M solution of NaOH. The pKa of hydrazoic acid is 4.72. Calculate the pH of the acid solution after the chemist has added 1006.