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.

What is the volume for 56.0 grams of O2 as gasses at STP

If the bond enthalpy for a C-C bond is 348 kJ, what will happen when the C-C bond is formed?

The number of atoms that are in a 1.75 - mo1 sample of CHC13

How many grams of glucose are in 11.5 moles?

What is the molecular weight (mass) for Ba (NO3) 2? 275.35 g/mol 261.34 g/mol 199.33 g/mol

A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = - 320.1 kJ/mol and ΔS = - 86.00 J/K · mol. Determine the temperature (in °C) below which the reaction is spontaneous.

Is it possible for a balloon with an initial internal pressure equal to 250.0 kPa to naturally expand to four times its initial volume when the temperature remains constant and the atmospheric pressure is 101.3 kPa?

How many atoms of gold (Au) are present in a sample of 2.5 mol Au? A. 1.5 * 1024 atoms Au B. 1.5 * 1023 atoms Au C. 4.2 * 1024 atoms Au D. 4.2 * 1023 atoms Au

what might cause the goldfish population to drop if the temperature moves out of its normal range? Name three things

Why must a chemistry experiments performed in a well ventilated room?