What does a machine change to make work easier? Select three options.

1) the amount of work done

2) the amount of force applied

3) the time needed to do the work

4) the direction of a force

5) the distance over which over a force is applied

A piece of dry ice (solid carbon dioxide) with a mass of 5.50 g is placed in a 10.0-l vessel that already contains air at 705 torr and 24 °c.

Why does ice float on water? the temperature of ice is lower than the temperature of water. the temperature of water and ice are the same. the density of ice is less than the density of water. the density of ice is greater than the density of water.

Define chemical symbol and what is the significance of a chemical symbol. who first invented a chemical symbol.

Why will liquids evaporate even at room temperature?

Which important change in electronic devices, such as televisions and computers, is a result of the use of metalloids as semiconductors?

A fish company delivers 22 kg of salmon, 5.5 kg of crab and 3.48 kg of oysters to your seafood restaurant. What is the mass, in kilograms of the seafood? What is the total number of pounds?

If 38.7 grams of lithium chlorate decomposes, how many grams of oxygen gas can be produced?

Balance the following redox equation in acidic solution using the smallest integers possible and select the correct coefficient for the H + (aq) ion.

Toussaint L' ouveeture lead a revolt that eventually resulted in Independence for

If a solution contains 1 x 106 hb molecules, how many o2 binding sites are available? if the solution of hb is 50% saturated with o2, how many binding sites are occupied by o2?