Category 1
Two or more pure substances can be physically combined to produce a _______.
what is a mixture
The following number, 2.006 has ______ significant figures.
What are four
What is the formula mass of glucose? C6H12O6
What is 180.156
How many molecules of ethane (C2H6) are present in 0.334g of C2H6?
6.69 x 1021 molecules
The percentage of carbon in a small box of the pure substance sucrose (table sugar) is 42.1%. Is sucrose a mixture or a compound?
What is a compound
_______ are the initial explanation for some observed fact or facts, are based on observation and evidence, and are to be tested and revised through experimentation.
Hypotheses
A 151g sample of lead has a volume of 13.4mL. Calculate the density of lead.
11.3g/mL
convert 30 g of glucose to moles
Hint: in order to move from grams to moles you must divide the grams given by the molar mass.
what is 0.166522g
Calculate the number of C atoms in 1.50g of Glucose (C6H12O6), a sugar
2.01 x 1022 atoms
Name the compound: nitric acid
HNO3
The _______ is the closeness of the average of a set of measurements to the true value.
accuracy
The mass of 4.57 mol of CO2 is ____.
what is 201 g
A professor keeps a jar of seawater, sand, and shells to remember her summer trip. The contents in this jar make up ______.
What is a heterogenous mixture
Sea water contains roughly 28.9g of NaCl per liter. What is the molarity of sodium chloride in sea water?
0.0482M
3. An employee makes $18.00 per hour. Given that there are 52 weeks in a year and assuming a 40-hour work week, calculate the employee’s yearly salary.
$37,440 per year
A positive ion is called a _____.
cation
A sample of iron contains 5.74 mol Fe. calculate the number of iron atoms in the sample.
what are 3.45 x 1024 Fe atoms
If phosphorous has a density of 1.83 g/mL and you have a total of 3 grams of it, how much volume does it take up?
Hint: d=m/v, isolate v.
Hint: 1mL converts to 1cm3
what is 1.64 cm3
What is the type of reaction for the following reaction?
2Mg + O2 ----> 2MgO
What is combination
How many moles of each element are in 4.0 mol CCl4 ?
4.0 mol C
16 mol Cl
What is the formula for sulfurous acid?
H2SO4
A sample of a compound with a formula mass of 34.00 u is found to consist of 0.44g H and 6.92g O. Find its molecular formula.
H2O2
What is the molarity (M) of a solution that contains 7.67 moles (m) of KCl in a 5L solution?
Hint: M=m/L
What is 1.53M
Which of the following is not a homogenous mixture?
milk, cookies, water, coffee
what is cookies
Calculate the mass of nitrogen in a 4.75 g sample of nitrogen monoxide, NO, which has a percent composition of 46.68% nitrogen and 53.32% oxygen by mass.
2.22 g N