State the rules governing the number of significant figures that result from each of the following operations addition and subtraction; mutiplication and divison

Alpha effect on atomic mass and effect on atomic number

What is the expected outcome of adding a catalyst to a chemical reaction? a. the reaction will speed up. b. chemical equilibrium will not be reached. c. the reaction will slow down. d. no change will occur.

Which of the following statements is true? Ca does not react with other atoms because it has 8 electrons in its outermost shell. Mg does not react with other atoms because its outermost shell is complete.

Convert 43.0 grams of SiH4 to moles

Which of the following takes place during a redox reaction? A. Electrons are gained only. B. Electrons are lost only. C. Electrons are both gained and lost. D. Electrons are neither gained nor lost.

7. If you fill a balloon with 5.2 moles of gas and it creates a balloon with a volume of 23.5 liters, how many moles are in a balloon at the same temperature and pressure that has a volume of 14.9 liters

Which compound is formed from its elements by an exothermic reaction at 298 K and 101.3 kPa?

State one major difference between having a nitrogen atom in a ring structure and having an oxygen atom in that structure

Can dowels be chopsticks, since both of them are wood?

Which electron configuration represents the electrons in an atom of Ga in an excited state?