True or False? A change in color is evidence of a chemical reaction

What is the mass of a 5.00cm^3 piece of copper that has a density 8.96g/cm?

A solution that contains a small amount of salt and a large amount of water is said to be a? A. saturated B. concentrated C. monounsaturated D. Dilute

Calculate the molecular mass or formula mass (in amu) of each of the following substances: (a) BrN3 amu (b) C2H6 amu (c) NF2 amu (d) Al2S3 amu (e) Fe (NO3) 3 amu (f) Mg3N2 amu (g) (NH4) 2CO3 amu

What masses of kbr and water are needed to produce 300. g of a solution that is 3.00 % by mass?

What's 1.16 (6 repeating) in scientific notation?

Hydrogen is an element with two naturally occurring isotopes: 2 H and 3 H. This means that 2 H, which has a mass number of 2, has fewer than 3 H, which has a mass number of 3. True/False

C₂H₂ + O2 - CO₂ + H₂ How many moles of oxygen are necessary to react completely with 4.0 moles of propane (CH) ?

What are the two main classifications of energy resources?

A liquid is heated and a solid forms at the bottom of the beaker. Is this a physical or chemical change?

How to predict the formula of an ionic compound based on the charges of the ions?