Fill in the blank. A ___ is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting

The molar heat of vaporization for water is 10.79 kJ/mol. How much energy must be absorbed by 100 grams of water at 100 °C in order to convert it to steam at 100 °C?

What is thermal energy? A. the total energy of temperature B. the total energy of heat molecules C. the total energy of the motion of molecules D. the total energy of objects measured in Fahrenheit

Which of the following describes the difference between nitrogen-14 and nitrogen-15? A. Nitrogen-14 has 14 electrons, 14 protons, and 14 neutrons; nitrogen-15 has 15 electrons, 15 protons, and 15 neutrons. B.

All of the following are true about science except: A) It is a body of knowledge. B) It does not change once a law is discovered. C) It is tested by many scientists over time. D) It uses the scientific method.

Student left a jar of water outside his home. Water can be a solid, liquid, or gas. When he put the jar side, the water was liquid. Twelve hours later, the water had changed phase and was a gas.

What are the coefficients that will balance the skeleton equation below? alcl3 + naoh → al (oh) 3 + nacl?

Balance the equation? c4h10 (g) + ? o2 (g) →? co2 (g) + ? h2o (g), using the smallest possible integers. what is the coefficient of c4h10?

What organelle stores water, food, or waste

Choose the correct statement relating to a chemical reaction. A. The number of atoms on the reactant side equals the number of atoms on the product side. B.

If 4.00 g of NaCl react with 10.00 g of AgNO3, what is the excess reactant?