A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.71 g/mL, 1.73 g/mL, 1.67 g/mL, 1.69 g/mL. If the actual value for the density of the sugar solution is 1.40 g/mL, which statement below best describes her results?
A) Her results are precise, but not accurate.
Her results are accurate, but not precise.
B) Her results are neither precise nor accurate.
C) Her results are both precise and accurate
D) It isn't possible to determine with the information given.
Answer: B) Her results are precise, but not accurate.
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Chemistry Chapter 2
- Determine the answer to the following equation with correct number of significant figures: 106 ÷ 9.02 × 1.9 =
- Determine the answer for the equation below with correct number of significant figures: 1.2 × 1.79 =
- Determine the answer for the equation below with correct number of significant figures: 3.215 × 13.2 ÷ 0.218 =
- How many significant digits should be reported in the answer to the following calculation? (4.3 - 3.7) × 12.3 =
- In which set do all elements tend to form anions in binary ionic compounds?
- Write the name for FeS.
- Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol.
- Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19 g/mol.
- Combustion analysis of 63.8 mg of a C, H and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?
- Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.
- When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers. Which law does this refer to?
- Give the number of electrons in P-3.
- Predict the charge that the ion formed from bromine would have.
- Which of the following elements is a nonmetal?
- Which of the following elements is a noble gas?
- Which of the following elements is an alkaline earth metal?
- The atomic mass for cadmium is
- Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.11%. What is the amu of the other isotope?
- Which of the following contains the MOST atoms? You shouldn't need to do a calculation here.
- How many Li atoms are contained in 97.9 g of Li?
- Calculate the mass (in g) of 1.9 x 1024 atoms of Pb.
- A mass of mercury occupies 0.550 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g/mL and the density of ethanol is 0.789 g/mL.
- Choose the element from the list below.
- Choose the homogeneous mixture from the list below.
- Which of the following are examples of a chemical change?