Explain physical and chemical reactions to 8th grade

What are two ways climate can influence weathering?

How do concentrated basic solutions differ from other basic solutions?

If a pill has a mass of 0.005g, what is the pills mass using scientific notation?

A good reaction that gives off a bright light occurs when magnesium is burned in a bunsen burner. As a result, it binds with oxygen in the air. What is the balanced chemical equation for this reaction?

A barium hydroxide solution is prepared by dissolving 1.90 g of Ba (OH) 2 in water to make 71.1 mL of solution. What is the concentration of the solution in units of molarity?

What is the enthaply of the reaction?

Which color has a higher frequency, A. red light B. blue light

what is the volume of 0.98 mol oxygen (O2) gas at 275 K and a pressure of 2.0 atm? (the universal gas constant is 0.0821 L*atm/mol*K)

Which element is classified as an alkali metal? Rb Sr Zr Cl

Which statements about a neutral atom are correct? Check all that apply. The positively charged particles in the nucleus are positrons. The radius of the electron cloud is twice as large as the radius of the nucleus.