What are variables that do not change in a experiment called

A coin floats on the top of a glass of water. Explain why the coin is able to float on top of the water in this glass.

Propane and oxygen react according to the equation: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g). How many grams of water can be produced from the complete combustion of 2.0 moles of C₃H₈ (g) ? a. 144.0 b. 82.0 c. 8.0 d. 44.8 e. 22.4

Where is the most active region of star formation in our galaxy

I've got a car with an internal volume 15,500 L. If I drive my car into the river and it implodes, what will be the volume of the gas when pressure goes from 1.5 atm to 2.3 atm?

Given the balanced equation 2 (H2 S) + 3 (O2) = 2 (S O2) + (H2 O) What is the correct mole ratio set? H2 S: S O2 = 2:2, O2:H2 O 2:2, 3:2 2:3, 3:2 4:4, 5:4 4:6, 4:4

Observe: Change the Surface area from Minimum to Maximum. You can imagine that a solid reactant has been dissolved in a liquid. How does this change how many Reactant B molecules are exposed to Reactant A?

When placed in a 200-mL square box, a substance has a spherical shape and has a volume of 75 mL When placed in a 200-mL circular tube, the same amount of that same substance has a spherical shape and a 75-mL volume.

What is the example to the word camouflage

Given the reaction 2NaOH + H2SO4 = Na2SO4 + 2H2O, what is the total number of grams of NaOH needed to react completely with 196 grams of H2SO4

The mass flow rate of gasoline leaving a refinery is 1610 kg/min. The specific gravity of a gasoline is 0.700. A retail gasoline pump is able to fill a 20.0 gallon automobile tank in 1.80 minutes.