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Chapter 1: Q27 E (page 56)

Classify each of the following changes as physical or chemical:

(a) condensation of steam

(b) burning of gasoline

(c) souring of milk

(d) dissolving of sugar in water

(e) melting of gold

Short Answer

Expert verified
  1. Physical
  2. Chemical
  3. Chemical
  4. Physical
  5. Physical

Step by step solution

01

Understanding what is physical and chemical change

Physical change is a type of change in which physical structure changes but chemical composition does not change.

Chemical change is a change in which chemical composition of a substance changes.

02

Analyzing the phenomenon (a), (b), (c), (d) and (e)

  1. It can be reversed by evaporating,so it is a physical change.
  2. It cannot be reversed, so it ischemical change.
  3. Souring of milk cannot be reversed, so it is a chemical change.
  4. Dissolving of sugar can be reversed using condensation and crystallization, so it isa physical change.
  5. It can be reversed back on freezing, so it is a physical change.

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Most popular questions from this chapter

Yeast converts glucose to ethanol and carbon dioxide during anaerobic fermentation as depicted in the simple chemical equation here:

\({\rm{Glucose}} \to {\rm{Ethanol + Carbon Dioxide}}\)

(a) If\(200.0g\)of glucose is fully converted, what will be the total mass of ethanol and carbon dioxide produced?

(b) If the fermentation is carried out in an open container, would you expect the mass of the container and contents after fermentation to be less than, greater than, or the same as the mass of the container and contents before fermentation? Explain.

(c) If\(99.7g\)of carbon dioxide is produced, what mass of ethanol is produced?

Question: Solve these problems about lumber dimensions.

a) TO describe to a European how houses are constructed in the US, the dimensions of “Two-by-four” lumber must be converted into metric units. The thickness × width × length dimensions are 1.50 in. × 3.50 in. × 8.00 ft in the US. What are the dimensions in cm × cm × m?

b) This lumber can be used as vertical studs, which are typically placed 16.0 in. Apart. What is that distance in centimetres?

What are the allowed values for each of the four quantum numbers:n,l,ml, andms?

The density (d) of a substance is an intensive property that is defined as the ratio of its mass(m) to its volume (V).

\(\begin{aligned}{\rm{density = }}\frac{{{\rm{mass}}}}{{{\rm{volume}}}}\\{\rm{d = }}\frac{{\rm{m}}}{{\rm{v}}}\end{aligned}\)

Considering that mass and volume are intensive properties, explain why their ratio, density is intensive.

(a) Add 2.334 ml. and 0.31 ml.

(b) Subtract 55.8752 m from 56.533 m.
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