Which of the following produces a chemical change? O A. Boiling water
B. Burning candle wax
O C. Cooling molten lava
O D. Grinding iron into powder

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?

Which of the following are correct values for the ideal gas laws constant r

Write and balance the chemical equation that represents the reaction of aqueous sulfuric acid with aqueous sodium hydroxide to form water and sodium sulfate. include phases.