Carbon-13 is an isotope of carbon. The atomic number of carbon is 6. How many neutrons does carbon-13 have?

A liquid has a volume of 34.6 ml and a mass of 46.0 g. what is the density of the liquid?

Which statement describes a chemical change? 1. Alcohol evaporates. 2. Water vapor forms snowflakes. 3. Table salt (NaCl) is crushed into powder. 4. Glucose (C6H12O6) and oxygen produce CO2 and H2O.

How temperature can affect the speed of reaction.

Calculate the pH during the titration of 30.00 mL of 0.1000 M HCOOH (aq) with 0.1000 M NaOH (aq) after 29.3 mL of the base have been added. Ka of formic acid = 1.8 x 10-4.

Sodium and water react according to the following equation. If 31.5g of sodium are added to excess water, how many liters of hydrogen gas are formed at STP? Show all work for credit. 2Na + 2H2O 2NaOH + H2

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.

Give reasons 1) copper utensils and sheets become blackish after some days

Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs for? H and? S (for the system).