What is the percent composition by mass of hydrogen in NH4HCO3 (gram-formula mass = 79 grams/mole) ?

What is an acid-base indicator?

Hydrocarbons consist mostly of carbon atoms bonded to helium atoms. true false

When a 6.50-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 21.6 degrees C to 37.8 degrees C. Calculate delta H (in kJ/mol NaOH) for the solution process.

3. Which changes can reach dynamic equilibrium? 1. nuclear changes, only 2. chemical changes, only 3. nuclear and physical changes 4. chemical and physical changes

Solid sodium carbonate, Na2CO3, reacts with sulfuric acid, H2SO4, to produce CO2 gas according to the following equation: Na2CO3 (s) + H2SO4 (aq) →CO2 (g) + H2O (l) + Na2SO4 (aq) During an experiment to produce carbon dioxide gas, a student recorded

elect all of the true statements regarding chemical equilibrium. The concentrations of reactants and products are equal. The concentrations of reactants and products remain constant. Reactants are being converted to products and vice versa.

Is dew forming on a leaf a physical or chemical change?

What are some examples of density?

A 0.110 mol sample of an ideal gas occupies 3.50l. what is the volume of 0.250 moles of this gas at the same temperature and pressure?

Give an example of an industry i n which Chemistry is used and explain how it is.