A chemical reaction gives off 2,100 kJ of heat energy.

About how many calories is it equal to?

(1 calorie=4.18 Joules)

5.0 * 10³ calories

5.0*10^4 calories

5.0*10^5 calories

5.0*10^6 calories

Which of the following groups contains mostly radioactive elements? Question 5 options: nonmetals alkaline earth metals halogens inner transition metals

An astronaut throws a wrench in interstellar space. How much force is required to keep the wrench moving continuously with constant velocity?

4 major nutrient types broken down by the digestive system. Name these 4 major nutrients

What term identified a type of reaction

A balloon is inflated with 0.2494g of helium to a pressure of 1.26atm. If the desired volume of the balloon is 1.250L, what must the temperature be in ⁰C?

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.

2) Which of the following is a true statement? A: All the atoms of an element must be identical. B: Compounds may be separated by physical means. C: Mixtures may not be separated. D: Homogeneous is one type of compound.

How to tell the difference between ionic and covalent bonding?

The combustion of propane may be described by the chemical equation C3H8 (g) + 5O2 (g) ⟶3CO2 (g) + 4H2O (g) C3H8 (g) + 5O2 (g) ⟶3CO2 (g) + 4H2O (g) How many grams of O2 (g) O2 (g) are needed to completely burn 83.3 g C3H8 (g) ?

Was the relationship among temperature, heat, and thermal energy?