Water change of state involves a release of energy

In order for the reaction: Ca + CuSO4--> Cu + CaSO4 to occur, which of the following must be true? • Cu. must be above Ca on the activity series. • Ca must be above Cu on the activity series. • Heat must be applied to the reaction.

Describe the mass of the reactants and products given the balanced chemical reaction.

Is the equation balanced? Why or why not? Na3PO4 + 3 KOH - -> 3 NaOH + K3PO4 O Yes because the law of conservation of energy is followed. There are equal amounts of energy in the reactants and products.

Two technicians are discussing refrigerant lines. Technician A says that line connections must be tight but not so tight that air can't get through.

According to the theory of continental drift, why do coastlines of africa and south america appear to fit together so well

True or False: It is recommended to use sugar cubes to sweeten lemonade because they have a low surface area.

54,000,000 nanometers equals 0.000000054 megameters.

When cream mixes with coffee, is this a chemical or physical change?

A gas occupies 72.1 at stp. At what temperature would the gas occupy 85.9 L at a pressure of 93.6 kPa?

An 80 kg volleyball player lands from a jump and tries to stop her forward motion. The normal contact force exerted by the floor on her shoes is 2000 N. The friction force exerted by the floor on her shoes is 600 N acting backward on the player.