An atom of potassium-37 and an atom of potassium-42 differ in their total number of

(1) electrons (3) protons

(2) neutrons (4) positrons

Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

A balanced chemical equation is shown below C6H1206 + 602-6H20 + 6CO2 Which of the following best describes the number of atoms for each element in the chemical equation? A.

Salt dissolving in water is what type of property?

Determine the mass of KNO3 that dissolves in 100. grams of water at 40 degrees celsius to produce a saturated solution

Chemical reactions with metals may create some interesting results such as a precipitate. What is a precipitate? Question 3 options: A. a gas that forms when two liquids are mixed B. a solid that forms when two liquids are mixed C.

Why does the rate of a reaction generally increase with increased temperature? (Choose all that apply) A. at higher temperatures, molecules are more likely to collide with each other in the correct orientation. B.

What is the wavelength of microwaves of 3.0x109 Hz frequency? c = 3.0x108 m/sec

When DNA is condensing into a chromosome, what protein is it wrapped around?

How does tye transfer of energy affect physical and chemical properties of matter

According to valence bond theory, which kind of orbitals overlap to form the p-cl bonds in pcl5?