Question 1

Which of the following best describes a chemical change?

Accepted Answer

Burning wood to produce ash and gases

Question 2

A sample of matter is observed to have a definite shape, is incompressible, and its particles vibrate in place. Which state of matter is this sample most likely in?

Accepted Answer

Solid

Question 3

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Salt water

Question 4

Which statement about compounds is correct?

Accepted Answer

Compounds have a fixed ratio of elements

Question 5

A 50.0 g sample of water is heated from $$20.0\ ^\circ\mathrm{C} to$$ $$30.0\ ^\circ\mathrm{C}. $$Given the specific heat of water is $$4.184\ \mathrm{J}/\mathrm{g}^\circ\mathrm{C}$$, how much energy is absorbed?

Accepted Answer

$$2092\ \mathrm{J}$$

Question 6

Which of the following is a physical property?

Accepted Answer

Melting point

Question 7

A mixture of sand, salt, and iron filings is to be separated. Which sequence of methods would best separate all three components?

Accepted Answer

Add water, filter, use a magnet, evaporate water

Question 8

Which of the following best describes an exothermic process?

Accepted Answer

Burning wood

Question 9

A 100.0 g bar of gold is heated from $$25.0\ ^\circ\mathrm{C} to$$ $$50.0\ ^\circ\mathrm{C}$$ and absorbs $$322\ \mathrm{J} of $$heat. What is the specific heat of gold?

Accepted Answer

$$0.129\ \mathrm{J}/\mathrm{g}^\circ\mathrm{C}$$

Question 10

Which of the following statements about gases is true?

Accepted Answer

Gases fill the entire volume of their container

Question 11

Which equation correctly relates Celsius and Kelvin temperatures?

Accepted Answer

$$K = ^\circ\mathrm{C} + 273.15$$

Question 12

A calorimeter contains $$150.0\ \mathrm{g} of $$water at $$22.0\ ^\circ\mathrm{C}. A $$peanut is burned beneath it, raising the water temperature to $$61.9\ ^\circ\mathrm{C}. $$How many Calories did the peanut release? ($$4.184\ \mathrm{J}/\mathrm{g}^\circ\mathrm{C}$$, $$1\ \mathrm{cal} = 4.184\ \mathrm{J}$$, $$1\ \mathrm{Cal} = 1000\ \mathrm{cal})$$

Accepted Answer

$$5.98\ \mathrm{Cal}$$

Question 13

Which of the following is NOT a characteristic of a liquid?

Accepted Answer

Particles are far apart and move very fast

Question 14

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 15

If $$5.0\ \mathrm{g} of A $$and $$2.0\ \mathrm{g} of B $$react to form $$4.0\ \mathrm{g} of C$$, how many grams of D are produced according to the law of conservation of mass?

Accepted Answer

$$3.0\ \mathrm{g}$$

Question 16

Which of the following best describes a heterogeneous mixture?

Accepted Answer

Soil

Question 17

Which of the following is true about energy changes in matter?

Accepted Answer

Energy is conserved and can be converted between forms

Question 18

A $$65.5\ \mathrm{g}$$ sample of copper cools from $$80.0\ ^\circ\mathrm{C} to$$ $$50.0\ ^\circ\mathrm{C}. If $$the specific heat of copper is $$0.385\ \mathrm{J}/\mathrm{g}^\circ\mathrm{C}$$, how much heat is lost?

Accepted Answer

$$755.6\ \mathrm{J}$$

Question 19

Which of the following is a correct statement about mixtures?

Accepted Answer

Mixtures can be separated by physical means

Matter and Energy: States, Classification, and Properties

Guida di studio - Domande di pratica

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