5 examples of each chemical properties, physical properties, chemical changes, and physical changes.

A sample of a material has 200 radioactive particles in it today. Your grandfather measured 400 radioactive particles in it 90 years ago.

when your tires heat up from driving on a hot road the pressure inside of them increase. this is an example of which gas law

1. What is the volume of 0.900 moles of an ideal gas at 25.0° C and a pressure of 950.0 mm Hg? 1.50 liters 17.6 liters 18.0 liters 34.2 liters 2. What is the pressure, in mm Hg, of 2.50 moles of an ideal gas if it has a volume of 50.

What is 57.048 rounded to three significant figures?

Two descriptions for a sub-atomic particle are listed below: Description 1: Non-charged particle Description 2: Located inside the nucleus of an atom Which sub-atomic particle or particles fit these descriptions?

Select all that apply. A scientific law: A - is generally accepted as true B - has never been found to be in error C - has no known contradictions D - must be reverified occasionally

A volume of 125 mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.

The volume of a gas is reduced from 4 l to 0.5 l while the temperature is held constant. what does the pressure of the gas do?

In an experiment, an unknown gas effuses at one-half the speed of oxygen gas, which has a molar mass of 32 g/mol. which might be the unknown gas?

7. Foam cup A has 36 mL of water that contain 2 moles of HCL at 20°C. Foam cup B has 36 mL of water that contain 2 moles NaOH of at 20°C. The contents of foam cup A are added to foam cup B and a chemical reaction occurs.