Complete the Section Questions at the end of EACH SECTION for SCIENCE COURSE

Open the attachment…At the end of each section you will see a set of questions…You will complete the questions at the end of each section…I HAVE ATTACHED A SAMPLE OF CHAPTER 2 SO YOU CAN SEE HOW IT SHOULD BE FORMATTEDREQUIREMENTS:YOU MUST WRITE OUT THE ENTIRE QUESTION AND ANSWER THE QUESTION IN COMPLETE SENTENCESYOU MUST NUMBER THE QUESTIONS THE WAY THEY ARE IN EACH SECTION (SEE MY ATTACHMENT SAMPLE FOR FORMATTING)PLEASE MAKE SURE TO ANSWER ALL QUESTIONS IN EACH SECTIONNO PLAGIARISM OF COURSE
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Student Name
Chapter 2
Section 1 Assessment
1.
a. What is the difference between chemical properties and physical properties?
A physical property is an observed conversion of matter without any change in
composition. On the other hand, chemical property involves changes in matter in terms of
composition.
b.
A metal melts at 4500 C. Is this a property of the metal classified as chemical or
physical? explain.
This property is physical since the element of the metal is not undergoing a change.
c.
Helium does not react with any other substance. Is it accurate to say that helium has
no chemical properties? Explain.
It is accurate to say that helium has no chemical properties because since Helium is not
reactive with other substances, it implies that the internal structure of Helium is never
affected greatly hence has no chemical properties.
2.
a. How are elements and compounds similar? How do they differ?
Both elements and compounds are made up of atoms. The difference is that elements
contains purely one type of atoms while compound is a combination of different atoms.
b. Plants make a sugar compound with the formula C6H12O6.. What elements makes
up this compound?
The compound has carbon, hydrogen and oxygen.
3.
a. How does a heterogeneous mixture differ from a homogeneous mixture?
A homogeneous mixture consists of the same uniform composition and appearance
throughout while heterogeneous mixture has phases or substances that are visibly
different.
b. Why is it correct to say that sea water is a mixture?
This is because seawater consists of salt and water combined together physically not
chemically.
4.
Suppose you stir a little baking soda into water until the water looks clear again.
How could you prove to someone that the clear material is a solution, not a compound?
Through evaporation, the baking soda will be left hence proving that it was a solution,
otherwise it will be termed as a compound if nothing is left.
Section 2 Assessment
1.
a. What is mass?
Mass is the amount of matter in a substance.
a. Why is mass more useful than weight for measuring matter?
This is because while mass is an objects’ basic property, weight is varied throughout the
universe.
2.
a. What property of matter is measured in cubic centimeters?
Volume is measured in cubic centimeters.
b. How are milliliters related to liters?
I liter is equivalent to 1000 milliliters.
c. A plastic box is 15.3 cm long, 9.0 cm wide, and 4.5 cm high. What is its volume?
Volume= length x width x height
= (15.3 x 9 x 4.5) cm
= 619.65 cm3
3.
a. What measurements must you make to find the density of a sample matter?
Mass is a product of density and volume. Therefore, to obtain the density of matter, mass
and volume of the substance must be measured.
4.
How can you determine whether a solid object is denser or less dense than water?
Submerge it in water; if it floats, then it is less dense than water, if it sinks then it is
denser than water
a. Propose a way to determine the density of air.
To determine the density of air, create vacuum from a balloon, measure its weight and
volume. Then, fill it with air and measure its weight again. Substrate the weights and use
volume and mass to calculate density.
Section 3 Assessment
1.
a. Identify three different kinds of physical change that could happen to a plastic
spoon.
The three different kinds of physical change that could happen to a plastic spoon include
melting it, bending it and breaking it.
b. Which of the following processes is not a physical change: drying wet clothes,
cutting snowflakes out of paper, Lighting a match from a matchbook?
Lighting a match from a matchbook is a chemical change; hence it is not a physical
change.
2.
a. What evidence would you look for to determine whether a chemical change has
occurred?
Evidence of a chemical change includes change in color, gas or precipitate formation, or
changes in temperature.
b. Why is electrolysis of water classified as a chemical change but the freezing of
water is not?
Electrolysis of water classified as a chemical change leads to formation of oxygen and
hydrogen because water is consumed. On the other hand, when water freezes, water is not
consumed hence it is not chemical change.
c. Explain why the mass of a rusted nail would be greater than mass of the nail
before rusted.
It would be greater because rust comprises of oxygen and iron. Therefore, an increase in
mass is witnessed since oxygen is added.
3.
a. What is thermal energy?
This is energy realized from a matters’ temperature.
b. How can you tell whether one glass of water has more thermal energy than
another, identical glass of water?
Substance and temperature determines thermal energy. A thermometer can be used to
determine the glass of water with more thermal energy since the two glasses contain
water.
c. How might you cause an endothermic chemical change to begin and keep going?
An endothermic change can be started and kept going through supplying heat; for
example, heating an ice cube.
Section 4 Assessment
1.
a. What are six forms of energy related to changes in matter?
The six forms of energy related to changes in matter are potential, kinetic, chemical,
electromagnetic, thermal and electrical.
b. Which form of energy is represented by a book lying on a desk? Which form of
energy is represented by a book falling off a desk?
Potential energy is represented by a book lying on a desk while kinetic energy is
represented by a book falling from a desk.
c. What happens to energy when matter undergoes a chemical or physical change?
During chemical or physical changes of matter, energy is transformed from one form
to another
2.
a. What happens to chemical energy during a chemical change?
Chemical energy during a chemical change is use to break bond. The energy is either
release or it is absorb depending on the type of reaction involved. Energy is release
during exothermic reactions while it is absorbed during endothermic reactions.
b. What are two main forms of energy given off when paper burns, and where
does the energy come from?
When a paper burns, heat and light energy are involved, and the energy comes
from the process of reaction between combust air and the paper material.
c. Describe the energy changes that link sunshine to your ability to turn a page in
this book.
The energy changes that links sunshine and our ability to turn a page in this book
is sunlight. This is because sunlight is a form of electromagnetic energy which
green plants are able to absorb, converting it to chemical energy in a stored form.
When the plant is eaten, it gives both thermal and chemical energy. Moreover,
electrical energy is produced through our nerves which then indicate to my hand
to turn over a books’ pages.

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