Which process is a chemical change?

1. freezing of liquid water to solid ice

2. condensation of gaseous steam to liquid water

3. boiling of liquid water to gaseous steam

4. decomposing of water to hydrogen gas and oxygen gas

What are the tiny particles that makes up all matter around us?

1. Which statement best describes scientific laws Scientific laws are scientists' opinions of why events occur in nature. Scientific laws describe specific relationships in nature without offering an explanation.

What would you move around if the bone were not separated by joints

N2 (g) + o2 (g) → 2 no (g) δh = + 180.7 kj 2 no (g) + o2 (g) → 2 no2 (g) δh = - 113.1 kj 2 n2o (g) → 2 n2 (g) + o2 (g) δh = - 163.2 kj use hess's law to calculate δh for the reaction. n2 (g) + 2 o2 (g) → 2 no2 (g).

How many grams of co2 Are produced from 128.00 g o2?

What happens when two or more atoms react?

If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is produced that contains 55.06% cobalt by mass. Calculate the empirical formula of the sulfide.

Calcium's atomic number is 20. it forms ions with 18 electrons. what is the electrical charge of a calcium ion?

The doldrums region on Earth is created by an amount of heating from the Sun that results in the rising of warm, moist air, low air pressure, cloudiness, high humidity, and numerous forms of severe weather, such as thunderstorms.

If a certain gas occupies a volume of 19 L when the applied pressure is 9.5 atm, find the pressure when the gas occupies a volume of 4.8 L