Energy is released from radioactive elements.

True or False

What happens when a given amount of gas at a constant temperature increases in a volume?

Butter melts when you heat it in a pan or on the stove is this a chemical change or a physical change? how can you tell?

Consider this reaction: KOH + HBr KBr + H2O Which statement is most likely true about HBr? O It turns blue litmus red O It reacts with carbon dioxide to form a carbonate O It feels slippery

If the density of pure water is 0.9922 g/mL at 40 ºC, calculate its theoretical molarity at that temperature. Report to 4 sig figs. (Only include numerical portion of your answer - do not include units)

Which of the following actions can a person take in order to best conserve fossil fuel resources? A - recycle newspapers B - ride a bike to school C - reuse a paper sack as gift wrap D - turn the faucet off while brushing your teeth Which one?

The osmotic pressure exerted by a solution is equal to the molarity multiplied by the absolute temperature and the gas constant RSuppose the osmotic pressure of a certain solution is measured to be 22. atm at an absolute temperature of 353.

Which one of the following is a redox reaction?. 2 Na (g) + Cl2 (g) 2 NaCl (s) A. K2Cr2O7 (aq) + 2 KOH (aq) 2 K2CrO4 (aq) + H2O (l) B. H2O (l) H + (aq) + OH - (aq) C. Na2CO3 (s) + 2 HCl (aq) 2 NaCl (aq) + CO2 (g) + H2O (l) D.

Name 4 common chemical properties of matter

Why is photosynthesis so important to plants, and can't animals use it?

One way the government of Kim Jong-il controls the lives of the people who live in North Korea is by a. requiring every citizen to vote. b. controlling information its people receive from the outside world. c. enforcing free trade with other nations.