Explain how Dalton improved upon atomic theory more than 2000 years after Democritus's hypotheses about atoms.

how much heat is required to change the temperature of 10 grams of water from 4 degrees Celsius to 8 degrees celsius?

Write net ionic equation for the reaction between nitric acid and calcium hydroxide. Express your answer as a chemical equation. Identify all of the phases in your answer.

Which of the following is a reason to make an armature the parent of a creature

Suppose that a laboratory analysis of white powder showed 42.59% Na, 12.02% C, and 44.99% oxygen. Would you report that the compound is sodium oxalate or sodium carbonate? (Use 43.38% Na, 11.33% C, and 45.29% O for sodium carbonate, and 34.

Nitrogen will react with hydrogen to form the compound ammonia. The compound formed has properties that are different from the elements that make it up. What has to occur in order for this compound to be formed?

Why are cells important?

How many grams of cacl2 are present in 25ml of a 0.500m solution?

A gas is contained in a thick-walled balloon. When the pressure changes from 18.7 psi to 20.2 psi, the volume changes from 0.475 L to 1.054 L and the temperature changes from K to 465 K.

Which sentence describes one characteristic of nonmetals? Nonmetals are often brittle solids. Nonmetals are often malleable. Nonmetals often conduct electricity. Nonmetals are often ductile.

How properties before and after a chemical reaction can be used to determine if a chemical reaction occurred