Write the symbol for the element with 30 neutrons and a mass number of A = 56.

Which two types of matter are pure substances? A homogenous mixtures and elements B solutions and compounds C elements and compounds D mixtures and elements

T 1000 k, the equilibrium constant for the reaction 2no (g) + / frac{1}{2} 1 2 o2 (g) arrowrt. Gifcl2 (g) + h2o is kp = 0.013. Calculate kp for the reverse reaction, 2hcl (g) + / frac{1}{2} 1 2 o2 (g) arrowrt. Gifcl2 (g) + h2o (g)

H2O2 (aq) = O2 (g) in acidic solution

A substance with a different number of neutrons and the same number of protons is called

Consider the single‑step, bimolecular reaction. CH3Br+NaOH⟶CH3OH+NaBr When the concentrations of CH3Br and NaOH are both 0.120 M, the rate of the reaction is 0.0080 M/s.

Think about a neutral magnesium atom. Then think of a magnesium ion with a 2+charge. How are these two alike? How are they different? Be sure to use the terms proton, neutron, and electron in your answer.

What subatomic particle is specifically responsible for combining the atoms together to form a new substance?

A chemist reported that 100 gallons of a gas were available in a laboratory. Which property of the gas did the chemist report?

Is the water density higher than the aluminum density

How many moles of molecular oxygen (o2) are consumed in the complete combustion of one mole of pentane (c5h12) ?