1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sever21 [200]
3 years ago
15

Alan wrote the following examples of changes in substance.

Physics
2 answers:
Anastaziya [24]3 years ago
6 0

Answer:

The correct option is B

Explanation:

A physical change is characterized by the following

  • no new substance is formed
  • easily reversible
  • cannot be represented by a chemical reaction

A chemical change is characterized by the following

  • new substances are formed
  • easily reversible
  • can be represented by a chemical reaction

A camp fire is usually made by burning woods. This process is called combustion, it involves the burning of a substance in oxygen to produce carbon dioxide (CO₂). This is a chemical change because new substance (CO₂) is formed and the ashes formed (after burning) cannot be reversed back to wood.

Plants convert carbon dioxide and water into glucose and oxygen through photosynthesis. This process is also a chemical change because new substances (glucose and oxygen) are formed and the reaction cannot also be easily reversed.

The reaction involved can be represented as  

6CO₂ + 6H₂O ⇒ C₆H₁₂O₆ + 6O₂

Yuliya22 [10]3 years ago
5 0
A campfire being lighted and plants converting carbon-dioxide and water into glucose and oxygen are both forms of chemical change.

Therefore, the answer is:

B. Both are examples of chemical change.
You might be interested in
Hi, Please help me with the 2 questions, will mark and 5 stars and THANKS
Anit [1.1K]

Both answers are going to be C

7 0
3 years ago
Read 2 more answers
Which instrument gives circumference of golf ball
Vesna [10]
Vernier caliber is used
6 0
3 years ago
How would seasons on earth be different if the earth was not tilted on its axis
MakcuM [25]

If the Earth's axis were 'straight' ... pefectly perpendicular to the ecliptic
plane ... then:

-- Day and night would be the same length ... every day of the year,
everywhere on Earth !

-- There wouldn't be any seasons, anywhere.  There might still be some
'weather' ... cloudy days, sunny days, occasional rain, wind etc.  But
there would be no average change during the year.  No hot months or
cold months.  In any one place, the weather would always be generally
the same, every day, all year.  Everywhere all around the equator would be
generally the hottest on Earth, and the local climates would generally get
cooler as you moved away from the equator and toward the poles.


5 0
4 years ago
Mechanical advantage of a machine can be increased by designing it for:
Tems11 [23]

Answer:(4).

Explanation:

8 0
3 years ago
Please help with the circled questions for my study guide need help asap
irina1246 [14]
<h3>Answer: A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series</h3>

Explanation: okay for question B its

5 0
2 years ago
Other questions:
  • (04.03 MC)
    9·2 answers
  • Give examples of plants that can reproduce by vegetative reproduction.​
    9·1 answer
  • Each water molecule is joined to _____ other water molecules by ____ bonds.
    14·2 answers
  • The Olympic record for running the 200 m dash is 19.3 seconds. What is the average speed for this record?
    5·2 answers
  • Why was Democritus considered a philosopher and not a scientist?
    12·1 answer
  • The image produced by a convex mirror is always closer to the mirror than it would be in a plane mirror for the same object dist
    6·1 answer
  • The velocity of any object depends upon
    13·2 answers
  • Please help
    12·1 answer
  • what is the magnitude of its velocity just before it strikes the ground, if the bottle was thrown straight out horizontally from
    15·2 answers
  • Briefly explain how einstein's special theory of relativity explains the perpendicular (right hand screw like) behavior of movin
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!