Is the following a chemical change or a physical change? A pencil is sharpened in a pencil sharpener, leaving behind shaving. Physical Change Chemical Change

If the pressure on a 3.0 liter sample of gas is doubled at constant temperature, the new volume will be

When we touch a Van de Graaff generator, our hair may stand up if it is dry. This happens only if the strands of our hair A) acquire atoms. B) repel each other. C) attract each other. D) gain negative charge.

Is a total uncertainty of 2.98% considered bad?

Avogadro defined one mole of carbon-12 atoms to have a mass of exactly 12.0 grams. Calculate the number of hydrogen atoms in 1 mole. A) 1.38 x 1025 atoms B) 1.66 x 1024 atoms C) 3.98 x 1023 atoms D) 6.02 x 1023 atoms

Which sample has the lowest entropy? (1) 1 mole of KNO3 (l) (3) 1 mole of H2O (l) (2) 1 mole of KNO3 (s) (4) 1 mole of H2O (g)

Calculate the molar solubility of ag2so4 in each solution below. the ksp of silver sulfate is 1.5 * 10-5. (a) 0.36 m agno3: (b) 0.36 m na2so4:

Which statement best illustrates why carbon is so important to living things? a. Carbon occurs as a solid, a liquid, and a gas. b. Carbon is found in both the living and nonliving worlds. c. Carbon is stored in large quantities in fossil fuels. d.

How do astronomers explain the formation of the milky way galaxy

1 What characteristic of an element determines how its atoms can bond with other atoms?

The law of conservation of mass states that during a chemical reaction, total mass is