Which of these is a coloured gas : sodium, magnesium, aluminium, silicon, phosphorous, sulphur, chlorine and argon

Which is a pure substance? air nitrogen apple juice tap water

Which statement best describes gamma radiation? (1) It has a mass of 1 and a charge of 1. (2) It has a mass of 0 and a charge of - 1. (3) It has a mass of 0 and a charge of 0. (4) It has a mass of 4 and a charge of + 2.

When a 1 kg ball is dropped from the roof of a building its speed increases from 0 m/s to 10 m/s just before it hits the ground. What is the ball's change in Kinetic Energy at its maximum (fastest) speed?

Which statement accurately describes the movement of Earth's plates due to convection currents? Material near the core cools as heat is transferred toward the crust. Heated materials become denser, causing them to rise toward the surface.

The nonprescription pain relievers Advil and Nuprin contain ibuprofen (C13H18O2), whose molecular mass is 206.3 amu. If all tablets in a bottle of a pain reliever together contain 0.

How many molecules of sodium nitrate are produced when 17 g of sodium azide, NaN3, react according to the following equation: NaN3 (aq) + AgNO3 (aq) - --> AgN3 (s) + NaNO3 (aq) Question options: 3.7x1023 1.6 x 1023 1.85x1023 6.02x1023

Which statement is true for the given reaction? Zn + PbSO4

A student states the following: "Since acetone (nail polish remover) evaporate more readily than water, one would assume that acetone has weaker intermolecular forces than water." Evaluate their claim. (2 sentences)

A catalyst can only be used once. True False

On what basis do we distinguish between substances and separate them from one another?