How much energy is needed to heat 1 kg of sand, which has a specific heat of 664 J / (kg K), from 30°C to 50°C?

If 11.5 grams of chlorine reacts with aluminum, how many grams of aluminum chloride will be formed according to the following reaction? 2 Al + 3 Cl2 à 2 AlCl3

A chemist requires 0.752 mol na2co3 for a reaction. how many grams does this correspond to?

Why are food preservatives added to food? O A. to increase the rate of reaction O B. to decrease the rate of reaction OC. to decrease potential energy of the reactants OD. to increase the temperature of the reaction

While heating copper in the final step, the bright copper color changes to dull brown. Will percent recovery be too high, too low, or unaffected? Explain your answer

How is ph related to the concentration of hydronium ions?

What happens when electrons are passed from one atom to a more electronegative atom?

Calculate the k sp for zinc hydroxide if the solubility of zn (oh) 2 in pure water is 2.1 * 10-4 g/l. calculate the k sp for zinc hydroxide if the solubility of zn (oh) 2 in pure water is 2.1 * 10-4 g/l. 2.9 * 10-3 1.5 * 10-3 9.9 * 10-18 3.8 * 10-17

What is the importance of the coefficients in a balanced chemical reaction?

The process that changes the identity and number of protons in a nucleus is

Which best describes the process of igneous rock formation?