What energy is needed to start a chemical reaction is

Which of the following correctly represents an exothermic reaction? a making ice cubes b a candle flame c burning sugar d all are examples of exothermic reactions

How many protons and neutrons does lithium have?

If you have 34 calories of energy, how many joules do you have

Which of the following statements is correct? Which of the following statements is correct? a. The temperature of the system is inversely proportional to the average kinetic energy of an atom in a system. b.

Which of the following correctly describes molecules of two different gases if they are at the same temperature and pressure? A. They must have the same mass B. They must have the same velocity C. They must have the same average kinetic energy D.

Audrey is driving 50 miles in 2 hours what is her average speed?

Water has a specific heat of 4184 J / (kgK) how much energy is needed to increase the temperature os a kilogram of water 5C?

A student noticed while doing the neutralization experiment that the calorimeter kept getting warmer. how would this error affect the final calculation for the δhneut of each reaction? would it be overestimated, underestimated or remain unaffected?

A solution contains 45 grams of nitrogen gas and 40 grams of argon. What is the mole fraction of argon in this solution?

How is an animal cell related to tissue and organs