During which two processes does a substance release energy?

1.

| freezing and condensation

freezing and melting

evaporation and condensation

evaporation and melting

Submi

If the concentration of cucl2 drops from 1.000 m to 0.655 m in the first 30.0 s of the reaction, what is the average rate of reaction over this time interval?

Which of the following results when iron and oxygen react? 1. fe2o3 corrodes 2. hydrated iron forms 3. iron oxide forms 4. a shiny metal forms 5. o2 dissolves in water

Two samples of sodium chloride were decomposed into their constituent elements. one sample produced 4.65 g of sodium and 7.16 g of chlorine, and the other sample produced 7.45 g of sodium and 11.5 g of chlorine.

What type of electromagnetic energy is charging a phone

Find the molar mass and the mass of 5.0000 mol of each of the following compounds. a. calcium acetate, Ca (C2H3O2) 2

What is the mass (in grams) of 8.45 x 1023 molecules of dextrose: C6H12O6 (Mw. 180.16 g/mol) ?

How do the number and kind of atoms in the reactants compare to the number and kind of atoms in the products

Scientists conduct experiments to collect evidence. Which of the following is the best definition of the word experiment as used by scientists?

The compound HCI is an example of a (n) A. covalent compound B. ionic compound C. element D. salt

Is the degree of highness or lowness of sound