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Chapter 3: Q. 3.80 (page 92)

Identify each of the following as a physical or chemical change: (3,2)

a. Aspirin tablets are broken in half.

b. Carrots are grated for use in a salad.

c. Mall undergoes fermentation to make beer.

d. A copper pipe reacts with air and turns green.

Short Answer

Expert verified

(part a) Breaking an aspirin tablet is a physical change because no new compounds are formed.

(part b) Carrot grating is a physical transformation. There are no new compounds formed.

(part c) Malt ferments and becomes a new substance. As a result, a chemical change occurs.

(part d) The reaction of a copper wire with air As a result, it is classified as a chemical property.

Step by step solution

01

Given information (Part a)

Aspirin tablets are broken in half.

02

Step 2:Explanation (Part a)

Aspirin tablet breaking is a physical change because no new compounds are formed during this process.

03

Step 3:Given information (Part b)

Carrots are grated for use in a salad.

04

Explanation (Part b)

Carrot grating is a physical change. Only the size of the carrot changes during this process, and no new substance is formed.

05

Given information (Part c)

Mall undergoes fermentation to make beer.

06

Explanation (Part c)

Malt ferments and transforms into a new substance. We won't be able to get the malt again. As a result, it is a chemical change.

07

Given information (Part d)

A copper pipe reacts with air and turns green.

08

Explanation (Part d)

When a copper wire reacts with air, it produces a green substance on its surface. As a result, it is a chemical property.

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Most popular questions from this chapter

Oa a hot sunny day, you get out of the swimming pool and sit in a metal chair, which is very hot. Would you predict that the specific heat of the metal is higher or lower than that of water? Explain.

After a week, biochemical reactions in compost slow, and the temperature drops to 45°C. The dark brown organic-rich mixture is ready for use in the garden. What is this temperature in degrees Fahrenheit? In kelvins?(3.3)

Use the heat equation to calculate the energy, in joules and calories, for each of the following (see Table 3.11):

a. to heat 5.25gof water from 5.5°Cto 64.8C6

b. lost when 75.0gof water cools from86.4°Cto 2.1°C

c. to heat 10.0gof silver from112°Cto 275°C

d. lost when18.0gof gold cools from224°Cto 118°C

The following graph is a heating curve for chloroform, a solvent for fats, oils, and waxes: (3.7)

a. What is the approximate melting point of chloroform?

b. What is the approximate boiling point of chloroform?

c. On the heating curve, identify the segments A, B, C, D, and Eas solid, liquid, gas, melting, or boiling.

d. At the following temperatures, is chloroform a solid, liquid, or gas?

−80∘C;−40∘C;25∘C;80∘C

In one box of nails, there are 75iron nails weighing 0.250lb. The density of iron is 7.86g/cm3. The specific heat of iron is 0.425J/g∘C. The melting point of iron is 1535∘C..(2.5,2.6,2.7,3.4,3.5)

aWhat is the volume, in cubic centimeters, of the iron nails in the box?

bIf 30 nails are added to a graduated cylinder containing 17.6mLof water, what is the new level of water, in milliliters, in the cylinder?

cHow much heat, in joules, must be added to the nails in the box to raise their temperature from 16∘Cto 125∘C?

dHow much heat, in joules, is required to heat one nail from 25∘Cto its melting point?
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