What part of an atom undergoes change during radioactive decay?
nucleus
Calculate the molar mass of potassium chlorate, .
122.551g
What is described by the expression 1.79M NaOH?
A solution of concentration 1.79 moles of NaOH per liter of water
What is the number of moles of solute in 250 mL of a 0.4M solution?
0.1 mol
How do you calculate the concentration of a solution in units of molarity?
Divide the number of moles of solute by the volume of the solution in liters.
Which sample contains the most concentrated solution of hydrochloric acid (HCl)?
800 mL of 2.00M HCl
Which form of radiation, if any, has the greatest penetrating power, and generally is the most dangerous?
gamma radiation
A solution of AgNO3 contains 40.0 g AgNO3 per 100 mL of water. What is the solution's molarity?
2M
What volume of 1.50M NaCl contains 3.40 moles of NaCl?
2.27 L
________________ is a reaction that involves the breaking apart of the nucleus.
fission
You conduct a laboratory investigation and produce 3.61 g of MgO. However, mathematically, you should have been able to produce 4.16 g. Calculate the percent yield.
86.8%
How does alpha decay affect the mass number of a nucleus?
Decreases by 4
Is PbI2 soluble in water?
no
What is the molarity of a solution containing 400.0 g CuSO4 in 4.00 L of solution?
0.627M
How much of a sample of radioisotope remains after one half-life?
Half after one half-life
Thea dissolves 0.33 mole of glucose into 450 mL of water. What is the concentration of the solution?
0.73M
How do chemists use balanced chemical equations?
To calculate amounts of reactants and products
A radioisotope has a half-life of 4 days. How much of a 20-gram sample of this radioisotope remains at the end of 8 days?
5 grams