What is meant by the negative sign in an answer like"-46.8kJ"? When would you use a positive sign

Which value gives the number of particles in 1 mol of a substance?

A very acidic ph level is

2) This is the process that releases energy by breaking down food molecules in the presence of oxygen.

What atomic property of cs is most responsible for its high reactivity?

What is destroyed and what is created during chemical reactions?

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.

Under what condition is decompostion the fastest? Under what condition is it the slowest?

Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI

Arrange the following bonds in order of increasing polarity: O-H, C-H, F-H, H-H A) O-H B) C-H<0-H C) H-H D) C-H E) HH