Concept explainers
(a)
Interpretation:
The average number of people entering the store per for the
Concept introduction:
Scientific notation is used to write large numbers by shifting the decimal point. It is expressed as the product of a decimal term and the power of
(b)
Interpretation:
The average height of the starting five members of a women’s basketball team is to be calculated.
Concept introduction:
Scientific notation is used to write large numbers by shifting the decimal point. It is expressed as the product of a decimal term and the power of
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Chemistry for Today: General, Organic, and Biochemistry
- A 124-g sample of a pure liquid, liquid A, with a density of 3.00 g/mL is mixed with a 40.8-mL sample of a pure liquid, liquid B, with a density of 2.00 g/mL. What is the total volume of the mixture? (Assume there is no reaction upon the mixing of A and B, and volumes are additive.)arrow_forwardA 15.5 g sample of sodium carbonate is added to a solution of acetic acid weighing 19.7 g. The two substances react, releasing carbon dioxide gas to the atmosphere. After reaction, the contents of the reaction vessel weigh 28.7 g. What is the mass of carbon dioxide given off during the reaction?arrow_forwardVanadium metal is added to steel to impart strength. The density of vanadium is 5.96 g/cm3. Express this in SI units (kg/m3).arrow_forward
- What instrument would you use to (a) measure the length of your bed? (b) measure the amount of acid delivered by a beaker? (c) determine whether you have a fever?arrow_forwardAlthough the preferred SI unit of area is the square meter, land is often measured in the metric system in hectares (ha). One hectare is equal to 10,000 m2. In the English system, land is often measured in acres (1 acre = 160 rod2). Use the exact conversions and those given in Exercise 47 to calculate the following. a. 1 ha = __________ km2 b. The area of a 5.5-acre plot of land in hectares, square meters, and square kilometers c. A lot with dimensions 120 ft by 75 ft is to be sold for 6500. What is the price per acre? What is the price per hectare?arrow_forwardDuring the experiment, the mass of original sample was 2.226 g, and the mass of copper obtained was 1.239 g. Based on these numbers, calculate the mass of chlorine in the original sample in grams. Include the unit and the three decimal places in your answer.arrow_forward
- A sample of unknown liquid is poured into a graduated cylinder and the volume of the unknown is 23.5 mL. The liquid used to fill the cylinder weighs 98.4g. From this information, calculate the density of this unknown liquid.arrow_forwardMeasurement and Matter Adding or subtracting and multiplying or dividing measurements 1/3 B A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: The label on the graduated cylinder says: empty weight: 7.2 g . She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed 63.517 g. . She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 91.0 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. g-mL Garrow_forwarda zinc rod is immersed in a silver nitrate solution. The rod was taken out of the solution and weighed. Its mass had increased by 1.5g. Calculate how much the silver layer weighed.arrow_forward
- 210 mg glucose per 100 ml blood. Avg body contains 11 pints, how many grams glucose. 1 pt = 473.176473 mlarrow_forwardDensity of a Solid Material Water was poured into a 25-ml graduated cylinder (Figure A). Into it was placed a sample of solid material weighing 25.867 g, resulting in the rise of the water (Figure B). Determine the density of the liquid material. Report all quantitative data with the proper number of significant figures. Don't forget to write the units. ml ml. 25 25 20 20 15 15 10 Fill the table. Show your solutions. Weight of the solid material Precision of the graduated cylinder Volume of the water + solid material Volume of the water Volume of the solid material Density of the solid materialarrow_forward3. When a piece of metal weighing 108 g is submerged in water the volume changes from 36.9 mL to 49.2 mL. Calculate the density of this metal. 4. The accepted value for the density of a certain metal is 6.81 g/cm³ . Calculate the percent error in a laboratory measurement that gives a density value of 6.6 g/cm³ . Express this result in the proper number of significant figures.arrow_forward
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