The combining of hydrogen and oxygen gas into liquid water is an example of what kind of change?

A. Phase

B. Chemical

C. Physical

What is the difference between an open system and a closed system

Determine the density of chlorine gas at 22 degrees C and 1 atm pressure

Why are glass cylinders preferred over plastic cylinders for conducting lab experiments?

What material makes up earth's outer core

Consider the reaction between hcl and o2: 4hcl (g) + o2 (g) →2h2o (l) + 2cl2 (g) when 63.1 g of hcl are allowed to react with 17.2 g of o2, 59.6 g of cl2 are collected.

Is it possible for a balloon with an initial internal pressure equal to 250.0 kPa to naturally expand to four times its initial volume when the temperature remains constant and the atmospheric pressure is 101.3 kPa?

How many atoms of gold (Au) are present in a sample of 2.5 mol Au? A. 1.5 * 1024 atoms Au B. 1.5 * 1023 atoms Au C. 4.2 * 1024 atoms Au D. 4.2 * 1023 atoms Au

what might cause the goldfish population to drop if the temperature moves out of its normal range? Name three things

Why must a chemistry experiments performed in a well ventilated room?

What kind of chemical bond does salt have?