Which of these would be caused by a chemical change?

A) The formation of lava.

B) Sedimantary rock layering over time.

C) Metamorphic rock forming from igneous.

D) Metamorphic rock eroding to form sedimentary rock.

Difluoromethane has the formula CH2F2 - this compound can be classified as A.) covalent, because it contains carbon and hydrogen B.) ionic, because it contains Fluorine ions C.) covalent because it contains only nonmetal D.

5.77 g of nitrogen react with excess hydrogen producing 6.83 g of ammonia what is the percent yield. Determine/Label the actual yield, theoretical yield, and the percent yield for the reaction. N2+3H2=2NH3

The electron configuration for aluminum (Al) is shown below: 1s22s22p63s23p1 Which diagram shows the correct distribution of electrons in the electron shells of an aluminum atom?

What isotope has 25 protons and 17 neutrons

The density of nitroglycerine is 1.60 g/ml what is the volume in liters of a mole of liquid nitroglycerine

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda