Is crashing cans a physical or chemical change?

Explain why?

How many moles of hydrogen are evolved when an excess of sodium metal is added to one mole of citric acid?

What is the uncertainty for each of the following numbers? a) 65.74 b) 60.009 c) 66_ _d) 65.750

Two aircraft rivets, one of iron and the other of copper, are placed in a calorimeter that has an initial temperature of 10°c. the data for the metals are as follows: iron copper mass (g) 39.0 13.0 initial t (°c) 0.0 100.0 c (j/g·k) 0.450 0.

In the gold foil experiment, a thin sheet of gold was bombarded with alpha particles. Almost all the alpha particles passed straight through the foil. Only a few alpha particles were deflected from their original paths.

How many alleles of each gene do living things have?

Do simple molecules conduct electricity? and why?

C) 2,2-dimethyl-3-heptyne how to draw

What is the difference between a solute and a solvent?

A 100 g sample of an unknown liquid absorbs 2000 j of heat energy, raising the liquid's temperature from 50 ◦ c to 70 ◦ c. what is the specific heat capacity of this liquid? no phase change took place.

How many moles are present in 1.51 x 10^23 molecules of HCl?