What is the percent by mass of oxygen in propanal, CH3CH2CHO? (1) 10.0% (3) 38.1%

(2) 27.6% (4) 62.1%

When the volume of a gas is changed from 1145 ml to 765 ml, the temperature will change from? k to 640 k?

An object has a constant mmass. A constant force on the object produces a constant?

Measurements show that the enthalpy of a mixture of gaseous reactants increases by 186. kJ during a certain chemical reaction, which is carried out at a constant pressure.

A piece of metal ore weighs 8.25 g. when a student places it into a graduated cylinder containing water, the liquid level rises from 21.25 ml to 26.47 ml. what is the density of the ore? 0.312 g/ml 1.58 g/ml 3.21 g/ml 0.633 g/ml

Which species represents a chemical compound? (1) N2 (3) Na (2) NH4 + (4) NaHCO3

The difference between ionic covalent and metallic bonding

As the speed of a particle increases, does its associated wavelenght increase or decrease

The composition of air by volume is approximately 1/5 oxygen, 4/5 nitrogen. When air is passed through red-hot carbon, the following reaction occurs: 2C + O2 (g) 2CO (g).

How many atomic mass units are equal to 1.672*10-24 g of protons?

What is the name of the compound Sr3N2?