Ch 3 Tro

If a particular process is endothermic, the reverse process must be a (an):

exothermic process.

An energy diagram that shows the reactants having greater energy than the products illustrates an:

exothermic reaction

Which of the following is a heterogenous mixture?

raisin bran

In order, what is the freezing point, room temperature and boiling point of water according to the Celsius scale?

0-25-100

When 49.5 J of heat was transferred to 7.3 g iron at 22°C, the temperature of iron increases to 37°C. What is the specific heat of iron in J/g∙°C?

0.45

How many Calories are in 575.0 calories?

0.5750

Global Outcome: G4 What is the specific heat (J/g∙°C) of a metal object whose temperature increases by 3.0°C when 17.5 g of metal was heated with 38.5 J?

0.73

The boiling point of water is: (1) 212 °F (2) 0°C (3) 373 K

1 and 3 only

How many joules are there in a 255 calorie snack bar?

1.07 × 103

Suppose it took 108 joules of energy to raise a bar of gold from 25.0°C to 29.7°C. Given that the specific heat capacity of gold is , what is the mass (in grams) of the bar of gold?

1.8 × 102 g

How much heat (kJ) is needed to raise the temperature of 100.0 grams of water from 25.0°C to ?

10.5

The temperature of 390 kelvin is warmer than which one of the following temperatures?

109 deg C

How many grams of water when supplied with of heat will gain a temperature of 5.2°C?

16

How many calories are there in a 255 Calorie snack bar?

2.55 × 105

When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 18 grams of water from 8 grams of methane and 32 grams of oxygen, how many grams of carbon dioxide were produced in the reaction?

22

How many joules are in 55.2 calories?

231

What is the value of -25°C on the Kelvin scale?

248

What is the final temperature of 25.0 grams of water at 22.0°C after it absorbs of heat?

26.3

How much heat (kJ) is absorbed by 948.0 g of water in order for the temperature to increase from 25.00C to 32.50C

29.7

What is the value of 27°C on the Kelvin temperature scale?

300

In order, what is the freezing point, room temperature and boiling point of water according to the Fahrenheit scale?

32-75-212

What is the value of 98 °F in units of °C?

37

How many kilojoules are there in 95.0 Calories?

397

When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 9 grams of water and 11 grams of carbon dioxide from 16 grams of oxygen, how many grams of methane were needed for the reaction?

4

A 15.0 gram lead ball at 25.0°C was heated with 40.5 joules of heat. Given the specific heat of lead is 0.128 J/g∙°C, what is the final temperature of the lead?

46.1°C

What is the value of 783 K in units of °C?

510

What is the value of 335 K on the Celsius temperature scale?

62

When methane is burned with oxygen the products are carbon dioxide and water. If you produce 36 grams of water and 44 grams of carbon dioxide from 16 grams of methane, how many grams of oxygen were needed for the reaction?

64

A sample of 508.4 grams of copper completely reacted with oxygen to form 572.4 grams of a copper oxide product. How many grams of oxygen must have reacted?

64.0

What is the value of 23°C on the Fahrenheit scale?

73

What is the value of 27°C on the Fahrenheit temperature scale?

81

In calculating the relationship between the amount of heat added to a substance and the corresponding temperature change, the specific heat capacity is usually represented by which symbol?

C

Which of the following statements about compounds is TRUE? A) A substance that cannot be broken down into simpler substances. B) A pure substance that has variable composition throughout. C) A substance composed of two or more elements in fixed, definite proportions. D) A substance that is not as common as pure elements.

C) A substance composed of two or more elements in fixed, definite proportions.

What type of energy is associated with the burning of gasoline?

chemical

A pure substance is:

composed of only one type of atom or molecule.

A solid form of matter in which there is long range repeating order is called ________.

crystalline

2All of the following can be considered physical properties EXCEPT:

flammability.

Consider the following specific heats of metals. Metal Specific Heat (J/g∙°C) Aluminum 0.903 Copper 0.385 Gold 0.128 Iron 0.449 Silver 0.235 If the same amount of heat is added to 50.0 g samples of each of the metals, which are all at the same temperature, which metal will reach the highest temperature?

gold

Which of the following is NOT an example of matter?

heat from a burning candle

A solution is an example of a (an):

homogeneous mixture.

Which type of energy is associated with motion?

kinetic

Melting point can be defined as the temperature when a solid becomes a liquid. The melting point of the chemical acetone is -95°C. Which state of matter would you expect to exist for acetone at a temperature of -94°C?

liquid

How would you classify raisin bran?

mixture-heterogeneous

How would you classify salt water?

mixture-homogeneous

Which of the following items is a mixture?

brass

Which of the following statements about matter is FALSE? A) Matter occupies space and has mass. B) Matter exists in either a solid, liquid or gas state. C) Matter is ultimately composed of atoms. D) Matter is smooth and continuous. E) none of the above

D) Matter is smooth and continuous.

Which of the following items is a pure substance? A) air B) seawater C) brass D) ice E) none of the above

D) ice

Which of the following statements about physical and chemical changes is FALSE? A) In a chemical change, matter changes its composition. B) In a physical change, matter does not change its composition. C) Phase changes are always physical changes. D) Chemical reactions are chemical changes. E) All of the above statements are true.

E) All of the above statements are true

Which of the following statements is FALSE? A) Matter may be a pure substance or it may be a mixture. B) A pure substance may either be an element or a compound. C) A mixture may be either homogeneous or heterogeneous. D) Mixtures may be composed of two or more elements, two or more compounds, or a combination of both. E) All of the above statements are true.

E) All of the above statements are true.

Which among the following statements is FALSE? A) A solid has a definite shape and a definite volume. B) A liquid has a definite volume C) A gas has neither definite volume nor definite shape. D) Both solids and liquids are incompressible while gases are compressible. E) none of the above

E) none of the above

Which state of matter has atomic spacing that is far apart and definite shape? A) liquid B) solid C) gas D) plasma E) none of the above

E) none of the above

Which of the following statements about energy is FALSE?

Energy is the single main component of the universe.

Given the table of specific heat values below, what is the identity of a 10.0 g metal sample that increases by when of energy is absorbed? Element Specific Heat(J/g°C) Au 0.128 Ag 0.235 Cu 0.385 Fe 0.449 Al 0.903

Fe

Given the table of specific heat values below, what is the identity of a 26.2 g metal sample that increases by 8.5°C when 100.0 J of energy is absorbed? Element Specific Heat(J/g°C) Au 0.128 Ag 0.235 Cu 0.385 Fe 0.449 Al 0.903

Fe

Which state of matter has indefinite shape and is compressible?

Gas

Which state of matter has atomic spacing that is close together and indefinite shape?

Liquid

If a solid piece of shiny sodium metal is exposed to chlorine gas, a large amount of heat is released and the white solid sodium chloride (table salt) forms. Based on this information, which of the following statements is TRUE?

This process was exothermic.

Which of the following is NOT true?

Water boils at the same temperature value on both the Kelvin and Celsius scales.

Which of the following is NOT an example of a physical property?

Water can form hydrogen and oxygen gas under electrolysis conditions.

If you hold a solid piece of pure gallium metal in your hand, your body heat will melt the gallium into its liquid form. This illustrates which of the following?

physical change

Which type of energy is associated with position?

potential

How would you classify sugar?

pure substance-compound

Which of the following is an example of a crystalline solid that shows an arrangement of long-range, repeating order?

salt

Which state of matter has atomic spacing that is close together and definite shape?

solid

1Which of the following is a homogeneous mixture?

stainless steel

Which of the following is NOT a technique that could be used to separate a mixture into its components?

stirring

Which of the following items is a physical property?

the odor of spearmint gum

Which of the following items is a chemical property?

the tarnishing of a copper statue

Physical properties are:

those that a substance displays without changing its composition.

Which of the following items is NOT a common unit of energy?

torr

From the following list of substances and heat capacities, choose the one that will have the lowest temperature after absorbing 100.0 kJ of heat. Assume identical masses of each substance start at the same initial temperature.

water-4.18 J/g∙°C