HW-Ch01 Essential Ideas

How many grams of iron are in 350. mg of iron? A. 0.350 g B. 3.50 g C.35.0 g

A. 0.350 g

What is the answer for the following calculation: 0.0234 × 139.37 ? A. 3.26 B.3.261258 C. 3.261

A. 3.26

A 150. g metallic block has a volue of 20.4 cm3 . What is the density of the metallic block in g/cm3 ? A. 7.34 g/cm3 B. 7.34 × 10-6 g/cm3 C. 7.34 × 10-3 g/cm3

A. 7.34 g/cm3

How would you determine the density of an irregular object? A. Group of answer choices d = m/v, so measure the mass of the object using a balance. Then to find volume, fill a graduated cylinder with a known amount of water and immerse the object in the water. The amount of displaced water is the volume in cm3 or mL. B. It would be impossible to determine the mass of the object without more information. C. d = m/v, so measure the mass of the object using a balance. Then to find volume, measure the height, width, and length using an appropriate measuring tool.

A. Group of answer choices d = m/v, so measure the mass of the object using a balance. Then to find volume, fill a graduated cylinder with a known amount of water and immerse the object in the water. The amount of displaced water is the volume in cm3 or mL.

Oxygen (O2) is classified as what type of matter? A. element B. homogeneous mixture C. compound

A. element

A salt water solution is classified as what type of matter? A. homogeneous mixture B. heterogeneous mixture C. pure substance

A. homogeneous mixture

It is important that scientists use units that are understood on a global level. These units are referred to as SI units which stands for _____. A. international system of units B. standard intercontinental units C. standard international units

A. international system of units

The scientific method involves various techniques which allow researchers to investigate scientific questions through _____ and _____. A. observations and experimentation B. analysis and observations C.analysis and predictions

A. observations and experimentation

Accuracy is defined as how close a measured value comes to a _____. A. true value B. fixed value C. core value

A. true value

Express 1.40 × 10-3 L in decimal notation. A.0.00140 L B. 0.0014 L C.0.014 L

A.0.00140 L

Convert 18.50 °C to the SI unit for temperature. A.291.65 K B.273.15 K C. 65.30 °F

A.291.65 K

How many significant figures are in 4.010000kg? A.7 B.3 C.5

A.7

An object with a mass of 0.255 kg has a density of 2.89 g/cm3 . What is the volume of the object? A. 8.82 × 10-2 cm3 B. 88.2 cm3 C. 8.82 × 10-4 cm3

B. 88.2 cm3

What is the SI unit for volume in the metric system? A. mL B. m3 C. L

B. M3

What can be used to measure the mass of an object? A.tape measure B. balance C. caliper

B. balance

Which of the following would be considered a physical change? A. burning paper B. boiling water C. digesting food

B. boiling water

Which is of the following is an example of a chemical change? A. cutting paper B. burning paper C. folding paper

B. burning paper

Which is of the following is an example of an extensive property? A. temperature B. mass C. density

B. mass

What is the SI unit for length? A. kilometer B. meter C. millimeter

B. meter

What is the answer for the following calculation: (1.249 - 0.0234) × 139.37 ? A. 170.812 B.170.8 C.170.81

B.170.8

An experimental mouse weighs about 4.41 x 10-2 lbs. What would the weight be in the SI unit for mass? A. 20,003 mg B. 20.0 g C. 0.0200 kg

C. 0.0200 kg

Convert 18.50 ft to the SI unit for length. A. 563.9 cm B. 0.005639 km C. 5.639 m

C. 5.639 m

An experiment requires you to make several measurements. Based on the values in the table below, what would be the best statement that represents the data set if the true value is 0.2135? A. The measurements in Trial A are accurate and precise, Trial B is neither accurate nor precise, and Trial C is accurate however, not precise. B. The measurements in Trial A are accurate and precise, Trial B is neither accurate nor precise, and Trial C is precise however, not accurate. C. The measurements in Trial A are accurate and precise, Trial's B and C are neither accurate nor precise.

C. The measurements in Trial A are accurate and precise, Trial's B and C are neither accurate nor precise.

Which is of the following is an example of a chemical property? A. acids are sour and bases are bitter B. water boils at 100 ° C. an iron nail rusts

C. an iron nail rusts

What is the SI unit for temperature? A. Celsius B. Fahrenheit C. kelvin

C. kelvin

What is the SI unit for mass in the metric system? A. g B. mg C. kg

C. kg

A statement about mass always being conserved in a chemical reaction is an example of a _____. A. theory B. hypothesis C. law

C. law

How many significant figures are in 0.0000401 kg? A.8 B.7 C.3

C.3