Student mixes 5 g of sand into a beaker of 20 g of water. Is this a physical or chemical change-why?

Whats a process that keeps food safe and clean

Which of the following is a true statement? Chemical changes are not ever useful. A chemical change changes only the size of the matter. A chemical change makes different matter from old matter. An ice cube melting is a chemical change.

Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know

The ratio of chlorine to hydrogen chloride in the reaction H2 (g) + Cl2 (g) - > 2 HCl (g) is

Which of the following statement best describes the energy change that takes place during deposition? A) Heat energy is released by the substance. B) Heat energy is maintained by the substance. C) Heat energy is slowly gained by the substance.

Magnesium hydroxide, the active ingredient in milk of magnesia, neutralizes stomach acid, primarily hcl, according to the reaction: mg (oh) 2 (aq) + 2 hcl (aq) → h2o (l) + mgcl2 (aq) how much hcl in grams can be neutralized by 5.

When 17.0 grams of an unknown metal is cooled from 35.0°c to 10.0°c it releases 862 joules of energy. what is the specific heat capacity of the unknown metal?

What action could slow a chemical reaction rate? a. lowering the pressure b. raising the temperature c. increasing the concentration d. adding more of a substance to a mixture

Write the ratio as a fraction in lowest terms. compare in inches. 3 feet to 45 inches

A solution contains 4.10 moles of water, 1.00 moles of sucrose (C12H22O11), and 1.10 moles of glucose. Sucrose and glucose are nonvolatile. What is the mole fraction of water in this solution?