What does it mean to say that mass is conserved during a chemical change

What do you call a substance that undergoes a change in a chemical reaction

One mole of an ideal gas is expanded from a volume of 1.00 liter to a volume of 6.43 liters against a constant external pressure of 1.00 atm. how much work (in joules) is performed on the surroundings? ignore significant figures for this problem.

Which of these characteristics best describes a basic solution? A:It tastes sour. B:It does not conduct electricity. C:It feels slippery. D:It turns litmus paper red.

Which set of coefficients would balance the following chemical equation? H3PO4 + RbOH → H2O + Rb3PO4 A. 2H3PO4 + RbOH → 3H2O + Rb3PO4 B. H3PO4 + 3RbOH → H2O + Rb3PO4 C. H3PO4 + RbOH → 2H2O + Rb3PO4 D. H3PO4 + 3RbOH → 3H2O + Rb3PO4

If an object has a volume of 1,355.1 mL, what is its volume in liters?

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.