A helium balloon contains 0.48g of helium. Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?

Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO3 (is). The equation for the reaction is 2 KClO3 ⟶ 2 KCl + 3 O 2 Calculate how many grams of O 2 (g) can be produced from heating 66.1 g KClO 3 (s).

Each element in the periodic table is assigned an atomic number. This number is the same as?

Which properties of mercury make it a good material to use in a thermostat

What is the relative acidity of tomato juice (pH 4) and milk (pH 6) ?

How would - 174.2 be written in scientific notation? A. - 1.742 x 10-2 B. 1 / (1.742 x 102 C. - 1.742 x 102 D. 1.742 x 10-2

he density of solid aluminum is 2.70. If a 1g peice of aluminum is dropped in a cup of water, it will sink to the bottomfloat to the tophover in the middle. (The density of water is 1.0

Match the action to the effect on the equilibrium position for the reaction N2 (g) + 3H2 (g) ⇌ 2NH3 (g). Match Term Definition Increasing the pressure A) Shift to the left Removing hydrogen gas B) No effect Adding a catalyst C) Shift to the right

The number of electrons in a neutral atom of hydrogen (H) atom is

What is buffer solution?

How can you simulate the radioactive half-life of an element?