Which of these is an example of a chemical change

f. methane is burned in air.

g. solid gold is melted to make jewelry.

h. a bar of copper is stretched into a long copper wire.

j. iron is coated with bronze to prevent rusting.

Why is CaF2 not a molecular formula? Which of the following is not an example of a molecular formula? a. H2O c. CaF2 b. NH3 d. O2

When was Magnesium discovered and how or who discovered it

The following forces act on an object: 3N left, 2N up, 1N right, 2N down. What is the total force on the object? Give the size and direction.

Which reaction occurs at the anode during the electrolysis of aqueous NaCl solution using inert electrodes? Hydrogen is released at the positive anode. Chlorine is released at the positive anode. Hydrogen is released at the negative anode.

Silicon (atomic number 14) has three isotopes: 28Si, 29Si, and 30Si. What is the number of protons in an atom of silicon with the highest mass number? 14 16 29 30

Reaction rate lab report

The absence of which cell structure would indicate a cell is prokaryotic?

When 0.880 g of an organic compound containing carbon, hydrogen and oxygen is burned completely in oxygen, 1.760 g of co2 and 0.720 g h2 o are produced. what is the empirical formula of the compound?

In ammonium chloride salt (nh4cl) the anion is a single chloride ion, cl. what is the cation of nh4cl

What does copper II sulfate do to the enzyme activity?