Q: A cylindrical slug of copper has a diameter of $$68.3 mm $$and a height of $$0.120 m. $$What is the volume of the cylinder in $$\mathrm{cm^3$}$$? (Use $$V = \pi r^2$ h)$$

$$4.40 \times 10^2$ $$\mathrm{$$cm^3$$}$$

Question 1

Which of the following best describes the scientific method?

Accepted Answer

A set of procedures used to acquire knowledge and explain phenomena

Question 2

Which of the following statements about scientific theories is correct?

Accepted Answer

A theory is a hypothesis that has been tested and validated over time

Question 3

Which of the following statements contains an exact number?

Accepted Answer

A gross of paper contains 144 sheets

Question 4

Which of the following numbers contains exactly three significant figures and no others?

Accepted Answer

$$0.00310$$

Question 5

When rounding the number $$0.090804 to $$four significant figures, what is the correct result?

Accepted Answer

$$0.09080$$

Question 6

A rubber band weighs $$0.0978 g. $$What is the total mass of $$106$$ such identical rubber bands, reported with the correct number of significant figures?

Accepted Answer

$$10.3 g$$

Question 7

A beaker ($$146.20 g) $$contains $$23.1 g of $$water and $$0.34 g of $$vitamin C. What is the total mass, reported with the correct number of significant figures?

Accepted Answer

$$169.6 g$$

Question 8

Which of the following sequences lists metric system prefixes in order of decreasing size?

Accepted Answer

kilo, centi, nano

Question 9

A cylindrical slug of copper has a diameter of $$68.3 mm $$and a height of $$0.120 m. $$What is the volume of the cylinder in $$\mathrm{cm^3$}$$? (Use $$V = \pi r^2$ h)$$

Accepted Answer

$$4.40 	imes 10^2$ $$\mathrm{$$cm^3$$}$$

Question 10

256 college students each donate one pint of blood. How many milliliters of blood is this? (1 pint = 473 mL)

Accepted Answer

$$121,100 mL$$

Question 11

The density of an object is the ratio of its ________ to its ________.

Accepted Answer

mass; volume

Question 12

What volume of a solution with a density of $$13.9 g/mL is $$needed to provide $$155$$ grams of solution?

Accepted Answer

$$11.2 mL$$

Question 13

If object A weighs $$24$$ grams and has a volume of $$3 mL$$, and object B weighs $$14$$ grams and has a volume of $$7 mL$$, which statement is correct?

Accepted Answer

A is four times as dense as B

Question 14

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 15

Which of the following is a chemical property?

Accepted Answer

Burning

Question 16

How many joules of heat must be removed to lower the temperature of a $$36.5 g Al $$bar from $$84.1$$ °C to $$56.8$$ °C? (Specific heat of Al = $$0.908 J/g$$ °C)

Accepted Answer

$$905 J$$

Question 17

Calculate the mass of gold ($$0.130 J/g$$°C) that requires $$468 J to $$heat the metal from $$21.6$$ °C to $$33.2$$ °C.

Accepted Answer

$$315 g$$

Question 18

How much energy is required to change $$12.9 g of $$solid Cu to molten Cu at $$1083$$ °C (melting point)? (Heat of fusion for Cu = $$205 J/g)$$

Accepted Answer

$$2640 J$$

Question 19

Which of the following best describes a homogeneous mixture?

Accepted Answer

A solution of table salt dissolved in water

Question 20

Which of the following statements about elements and compounds is correct?

Accepted Answer

Both elements and compounds are pure substances

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