What are the only elements that exist in nature as uncombined atoms?

Xcl3 name which element is at the pkace of the x?

Kara and John are pushing their grocery carts along a flat surface in a store. Kara's cart is empty, and John's cart is full. Kara and John each push their cart with the same force.

Acids and bases are very reactive chemicals. When an acid and a base are mixed together, the mixture can become very hot.

A gas in a balloon at constant pressure has a volume of 120.0 mL at - 123°C. What is the volume at 27.0°C?

The pH of a solution measures the [H3O+] in the solution. If one solution has a pH of 4 and another solution has a pH of 3, how does the [H3O+] in the two solutions compare? They are in a 1:1 ratio. They are in a 1:10 ratio.

Two components combine to create a binary ionic compound. Name one of them

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False

Action - reaction forces don't cancel each other. A. True B. False