Is putting salt into water a chemical or physical change

You have two balloons of equal volume at room temperature and 1 atm pressure. One balloon is filled with He and the other is filled with H2. Which statement is true about the relative number of gas particles in the two balloons?1.

When the equation __H2O2 - -> __H2O + __O2 Is completely balanced, the sum of all the coefficients will be A) 5 B) 8 C) 3 D) 4

How many moles are equal to 1.3 x 10^24 atoms of aluminum?

The si unit for measuring acceleration is?

Choose the appropriate volumetric device to use for each of the volume measuring applications.

Why is it necessary for the measuring devices to be clean

Copper consists of two naturally occuring isotopes. their masses are 62.930 amu and 64.928 amu. calculate their abundances.

Which statement is true about inorganic compounds? A. They are not made of atoms. B. They contain carbon. C. They are not made from living things. D. They are all elements.

Which domain do you find the most interesting why

Complete the matching exercise below by choosing the correct description of each bond type in aqueous solution. 1. covalent bond 2. hydrogen bond 3. electrons shared by atoms a. electrons shared by atoms b.