In spontaneous nuclear reactions: a. the products weigh less than the reactants b. the products weigh more than the reactants c. the difference in mass between reactants and products is zero d. mass is converted to light e. the products move at the speed of light squared
1.) What is the molarity of a solution made by dissolving 25.6 g of KOH (5601 g/mol) in enough water to make 3.00 L of solution? 2.) 2 Fe + 3 Cl2 ------> 2FeCl3 How many moles of Fe are needed to produce 76.4 g of FeCl3 (162.3 g/mol)? How many grams of Fe (55.8 g/mol) are needed to react with 123 g or cl2 (71.0 g/mo
If the value of Q is greater than Kp, then a. the system is in equilibrium b. the reaction will proceed to the right until equilibrium is established c. a catalyst is necessary to achieve equilibrium d. the reaction will go left or right depending on the reaction stoichiometry e. the reaction will proceed to
1. A collection of atoms, molecules, or ions that contains Avogadro's number of these items is called what? 2. The initial substances that undergo change in chemical reaction are called what? 3. The law that states that atoms are neither created nor destroyed in a chemical reaction, but may be rearranged, is called what? 4. T
Application of the mass-energy equivalence principle in stoichiometric calculations: calculation of weight loss during a nuclear fission reaction.
The nuclear fission energy for the isotope U-235 is 1.67x10^10 kJ/mole. What is the mass of the fission products produced from 1.000 kg of radioactive material U-235? What is the percent weight loss?
How many coulombs of charge are required to deposit 2.00g of Fe(s) from a solution of Fe3+?
1.) What volume of water is needed to completely dissolve 1g of AgBr in Liters? 2.) What is the water solubility of AgCl in gams per liter?
You have a mixed solution in a beaker which contains a bag of 4g dissolved in 15ML of water. The beaker contains 50g of glucose dissolved in 200mL of water. What is the percentage concentration of the two solutions? Does the glucose diffuse out or into the bag? And what will happen to the water?
The chlorophyll-a molecule, C55H72MgN4O5, is important in photosynthesis. (a) Determine its molecular mass (in atomic mass units) (b) What is the mass (in grams) of 3.00 moles of chlorophyll-a molecules?
Earth has a mass of 5.98 x 10^24 kg. The average mass of atoms that compose earth is 40u. How many atoms in the earth?
How may moles of ions are present in 500 mL of a 0.400 M solution of aluminum sulfate, (Al2(SO4)3)?
How do you find the limiting reagent and how much the other one is in excess?
How many moles of Pb are in 9.3*10^15 atoms of Pb?
Determining the limiting reactant based on the chemical equation and the available quantity of the reactants.
For the balanced reaction: N2H4 + 2H2O2 = N2 + 4H2O 12.0 g N2H4 is reacted with 23.0 g H2O2. Which is the limiting reactant?
Balancing a chemical equation and calculating the reactant quantity based on the reaction stoichiometry.
Balance the following equation: Cu(s)+ AgNO3(aq) = Ag(s) + Cu(NO3)2(aq) ("s" and "aq" in parantheses refers to the phase of the reactants and products, i.e. solid and aqueous, respectively.) What is the amount of Cu (in grams) necessary to precipitate 0.50 g of Ag in the presence of excess AgNO3?
A compound contains carbon, hydrogen, and oxygen. A 10 g sample is analyzed for carbon and hydrogen. It contains 1.315 g hydrogen and 5.213 g carbon. What is the empirical formula for this compound?
Determine the mass of lithium hydroxide produced when 0.38 g of lithium nitride reacts with water according to the following equation: Mass-Mass Li3N + 3 H2O ---> NH3 + 3LiOH
A copper coin has a mass of 3 g. What is the total charge of all the electrons in it ? Given that the atomic number of Cu is Z = 29 and the atomic mass is 63.5 g/mole.
Calculate the amount of gold deposited (in grams) from a solution of Au3+ if the electrolysis lasted 30 minutes at a current of 5.00A.
What are the products of the following radioactive decays? A. Alpha emission by: 162 Re 75 B. Beta emission by: 188 W 74 C. Positron emission by: 165 Ta 73
The following reaction is used in laboratories to produce oxygen: 2KclO3 (s) ----> 2KCl (s) + 3O2 (g) At 25 degrees Celsius and one atmosphere pressure, how many liters of O2 gas will be produced from the reaction of 165g of KClO3? See attachment for better equation.
The National Drinking Water standard for lead is no more than 0.015ppm. If a particular water supply sample has 2.5x10-7 moles of Pb per 5.0 liters, is it suitable for drinking?
1. Find out 2 or 3 uses for mercury. 2. For each use find out why mercury was chosen for the job 3. What are the dangers from using mercury.
How many moles of oxygen gas will react with 6.2 mol Al in the following reaction? 4Al + 3O2 -> 2Al2O3.
Which substance contains the greatest mass of bromine? a) 60.0g NaBrO3 b) 30.0g MgBr2 c) 5.0g HBrO4 d) 0.10 mol KBr e) 0.10 mol HBr
Burning 2.00g of propane, C3H8, produces 99.78 kJ of energy. How much energy is produced when one mole of the propane burns?
Determining the number of grams required by a reactant to produce a set number of grams of the product.
Oxygen gas can be prepared in a Laboratory by the reaction: 2KClO3(s) => 2KCl(s) + 3O2(g) How many grams of KClO3 must be reacted to produce100g of O2?
Convert 1) 75 mg/dL to mg/L 2) 592 uL to mL 3) What is the molarity of 45.0 g of NaCl dissolved in 1 L of water?