How do you distinguish a chemical change from a physical change

Tia has a sample of pure gold (Au). She weighed the sample and the result was 35.9 grams. Tia wants to determine the number of atoms in the sample. Calculate the number of atoms in 35.9 g of pure gold.

What are subscripts in a chemical formula and what do they stand for?

Suppose a small amount of lead (ii) chloride got into your ba (oh) 2 sample before your titration, contaminating it. how do you think this contamination would affect your calculated concentration for the sample

What country used the most energy in world during both 1990 and 2003?

Arsenic and bismuth are similar in that they both

Is a sample of liquid nitrogen more dense than a sample of nitrogen gas

You have a balloon containing 1 L of air at STP in a vacuum chamber. What will the volume of the balloon be when you reduce the pressure by half and increase the temperature to 373 K?

Which method will correctly determine whether the forces on an object are balanced or unbalanced? A. Multiply the forces in the horizontal direction by the forces in the vertical direction. B.

Carbon is found in all known forms of life. Which statement best describes why carbon is uniquely suited to forming macromolecules such as those found in living organisms? A. Carbon forms large compounds that are not chemically reactive. B.

Name a type of asteroid and give a description.