Which of these represents a physical change? a iron rusting b ice melting c wood burning d food spoiling

What is the specific heat of a substance that absorbs 2500 joules of heat when a sample of 100 g of the substance increases in temperature from 10 °c to 70°c?

The measure of the amount of dissolved salt in a liquid sample is called a. the water cycle. b. evaporation. c. salinity. d. a thermal exchange

How are ecosystems the same?

Calculate the average atomic mass of chromium

Which has more atoms: 1 mole of hydrogen atoms or 1 mole of carbon-12 atoms? A. 1 mole of carbon-12 atoms B. 1 Mole of hydrogen atoms C. They are equal

Which is NOT a property of gold? A. rare B. tarnishes C. malleable D. corrosion resistant

The element rubidium has two naturally occurring isotopes. The atomic mass of 85Rb (72.17 percent abundant) is 84.911794 amu. Determine the atomic mass of 87Rb (27.83 percent abundant). The average atomic mass of Rb is 85.4678 amu.

Describe what you can do to slow down, or stop the continuous negative human treatment of our aquatic biomes.

If the hydrogen ion concentration is 10-7M, what is the pH of the solution? Show all work.

When it is raining water is returning to earth as a water cycle stage called