If an increase in temperature accompanies a reaction what occurred

A. energy was absorbed

b. energy was released

c. energy was destroyed

d. energy was created

Characteristics: Sometimes called a "dirty snowball".; Has a hydrogen cloud.; Has a coma and a nucleus.; Invisible except when near the Sun. This is a description of a (n) A) comet B) asteroid C) meteor D) star

What rays of the earth release after turning the rays from the sun into heat energy

How do I find the molar mass of Copper (II) Nitrate?

Nina and her mother both have cell phones. Nina thinks her cell phone is lighter than her mother's. If Nina wants to compare masses of the cell phones what is the best tool for her to use? A) thermometer B) beaker C) balance D) graduated cylinder

What is the advantage of using written electron configurations

Four moles of hydrogen chloride (HCl) gas react with one mole of oxygen (O2) gas to produce two moles of chlorine gas (Cl2) and two moles of water gas (H2O).

The density of rubbing alcohol is 0.785g/mL at 25 Celsius. Calculate the mass of 15.0 mL of the rubbing alcohol.

Is the universe an isolated system?

1000ml of a gas is cooled from 500 K to 250 K, what is it's final volume? A. 250 ml B. 1000 ml C. 500 ml D. 750 ml E. 2000 ml

A reacton has a theoretical yield of 22.8g. When the reaction was carried out, 15.1g of the product was obtained. What is the percent yield?