How many significant figures should be present in the answer of the following calculations: 2.5 x 1.25 x 3.5/2.01

Which tools should be used to record the most complete data about a gas

Subtract 5.01x10^7-30x10^-9

Description of the outer core of the earth

Combining 0.381 mol of Fe2O3 with excess carbon produced 17.4 g of Fe.

Use complete sentences to explain how you determined the mass of oxygen in the compound produced in the virtual lab, and how the mass of each element can be used to determine the empirical formula of the compound.

1. A food sample is burned in a calorimeter that contains 2000. g of water. The temperature increases from 22.0°C to 44.3 °C. How many Calories does the food sample contain, assuming all of the energy from the food was transferred into the water?

Why doesn't water light on fire? It has all the ingredients except heat! Hydrogen for the flammability factor, oxygen so it can keep burning, and all you need to do is add heat and BOOM you have a flame! 15 pts

The type of social bonds present in modern societies that are based on difference, interdependence, and individual rights is called:

The difference between ionic covalent and metallic bonding

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