5H₂

1. What number represents the coefficient?

2. What number represents the subscript?

3. What element is represented by the letter H?

4. How many total H's are there?

Chlorine gas (C12) is a what?

Calculate the heat in joules "Q" needed to raise 27.0 g of water from 10.0 °C to 90.0 °C.

The carbon cycle is one of many biogeochemical cycles on earth. can you identify the main features of a biogeochemical cycle and show how the carbon cycle exhibits these features?

I'm a chemical equation which symbol should be used to indicate that a substance is in solution

Assume a cell membrane is permeable to water, but not to Na + or Cl - or any other solute. The NaCl concentration is higher outside the cell than inside the cell. The total solute concentration (osmolarity) is higher inside the cell than outside.

For the reaction 2Fe + 3Cl2 → 2FeCl3 which of the following options gives the correct reactant:reactant ratio? Fe:Cl2 = 1:1 Fe:Cl2 = 2:3 Fe:Cl2 = 3:2 Fe:FeCl3 = 1:1

A 2.575 g piece of gold (specific heat = 0.129 J/g°C) at a temperature of 75°C is placed into cold water at 10°C. If the gold loses 10.0 J of energy, what is its final temperature in the water? Enter your answer to the nearest whole number of °C.

The complete combustion of gaseous sucrose at a constant pressure absorbs 544 kj of heapt per mole of surcrose. write the balance thermochemical equation for the reaction

Find the acceleration if a car goes from 40 to 50 mph in 5 seconds

What is the percent by mass of nahco3 in a solution containing 10 g of nahco3 dissolved in 400 ml of h2o?