What is the mass of 0.500 mole of Ba? (Watch sf's) 68.7 g 137.3 g 68.65 g 69 g

Our atmosphere is composed of several gases. The name of the gas we breathe, O2, is

At constant volume, the pressure of a gas is 755 kPa at 30.0 degrees C. What is the temperature of the gas if the pressure is decreased to 252 kPa?

A student measures the mass and volume of a sample of copper at room temperature and 101.3 kpa. The mass is 48.9 grams and the volume is 5 cubic centimeters. The student calculates the density of the sample.

Which of the following best states the difference between an alcohol and an ether? In an alcohol, a carbon atom is double bonded to an oxygen atom; in an ether, a carbon atom is triple bonded to another carbon atom.

Ethene is often referred to as 'industry's most important organic chemical. What is the reason for this?

An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100 pennies?

Which pack has the greatest change in enthalpy, warm packs (such as hand warmers) or cold packs (such as an ice pack) ?

A gay cylinder what are the variables in gay-lussacs law

What is the cosmic address of earth in the cosmos?

What values do we plot on the y-axis of a graph