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Exam 3: Matter and Energy

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Question 51

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

A) 2.55 × 10⁵
B) 1.07 × 10⁶
C) 1.07 × 10³
D) 6.09 × 10⁴
E) none of the above

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Question 52

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The amount of heat energy needed to increase the temperature of an object will vary depending on the heat capacity of the object.

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Question 53

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If a pure material decomposes when heated into simpler substances,this proves that the material was a compound.

Chemical properties of a substance are those that can be observed without changing the composition of a substance.

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?

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?

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

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?

How many joules are in 55.2 calories?

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?

Temperature is simply a measure of the motion of atoms and molecules.

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

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?

Which of the following items is a mixture?

Which of the following is a heterogenous mixture?

A solution is an example of a (an) :

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?

A chemical change occurs when matter does not change its composition.

Solids have indefinite shape and volume.

A melting scoop of ice cream is an example of an exothermic process.