How many percent of ca are in calcium carbonate

Which of the following is an oxidation-reduction reaction? Which of the following is an oxidation-reduction reaction?

What can the arrow in a chemical reaction be translated to mean?

Which of these elements is a metal? Hafnium Radon Silicon Sulfur Selenium

What is a limitation to using nuclear fusion for energy Nuclear fusion produces a large amount of radioactive waste, the hydrogen fuel needed for the reaction is hard to collect, the atoms needed in a nuclear fusion reactions are too small to use,

One isotope of a metallic element has a mass number of 65 and 35 neutrons in the nucleus. the cation derived the isotope has 28 electrons. write a nuclear symbol for this element

The rate constant for the decomposition of n2o is 2.30 s-1. What is the half-life of the decomposition?

In the decomposition of 1.00 g of aluminum sulfide, how many grams of each elemnt should be produced? You need to write your own balanced equation here. Aluminum sulfide = aluminum + sulfur

If an atom is located in the 3rd period, which of the following is true: A. It will have 2 energy levels. B. It will have 3 energy levels. C. It can hold a maximum of 8 electrons in the third energy level D.

25.0 g sample of compound A is mixed with a 40.0 g sample of compound B. a chemical reaction occurs. Once the reaction is complete, the final mixture has a mass of 55.0g. What happens to the "missing" mass? How much mass is missing?

Model in which electrons are found in fixed levels around the nucleus and require energy to move from level to level: a. Bohr model c. Quantum mechanical model b. Rutherford model d. Free-electron model