You observe heat, light, and sound released by a chemical reaction. this reaction is

absorbing energy

consuming energy

exothermic

endothermic

Which element could likely substitute for Si in a solid solution? carbon o phosphorous aluminum sulfur

The positively charged dense center of a atom

How would an increase in total expenditures affect the nation's economy? A. It would cause an expansion. B. It would cause stagnation. C. It would cause a recession. D. It would cause a trade surplus.

What is the random mixing of gas molecules called?

avogadros law relates the volume of a gas to the number of moles of gas when temperatures and pressure are constant. according to the law, how many moles gaseous reactants if the volume if the volume of the gases is doubled

A small 15 kilogram canoe is floating downriver at a speed of 4 m/s. What is the canoe's kinetic energy?

Liquid water is heated until it boils and becomes water gas. Which statement is true about the water?

You are conducting an experiment on plant growth. You take a plant fresh from the soil that weighs 5 kilograms (kg). Then you dry the plant overnight and determine the dry weight to be 1 kg.

What is the ratio of Fe+3 ions to O2 - ions in a neutral compound? a. 1:2 b. 2:1 c. 2:3 d. 3:2

What is the specific heat capacity of a 17.5g sample of an unknown metal that releases 6700J of heat when it cools from 90 to 25 degrees C?