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
Leokris [45]
3 years ago
12

WORTH 20 POINTS HELP PLEASE

Chemistry
1 answer:
Damm [24]3 years ago
5 0

Answer:

The answers to your questions are below

Explanation:

Physical change is when matter changes its form but is still the same substance.

Chemical change is when matter changes its composition.

iron and oxygen from rust  It's a chemical change because iron and oxygen form a new compound different from the reactants.

iron is denser brightly when ignited . This is a chemical property because iron reacts with oxygen.

oil and water do not mix it's a physical change, oil and water are in touch but they do not react.

mercury melts at -39°C it's a physical property because mercury changes from solid to liquid but it still is mercury.

You might be interested in
A piece of lead with a mass of 14.9 grams at a temperature of 92.5 degrees Celsius is dropped into an insulated container of wat
Vesna [10]

the specific heat of lead is

6 0
3 years ago
Read 2 more answers
Suppose that CaO is added as an impurity to Li2O. If the Ca2+ substitutes for Li+, what kind of vacancies would you expect to fo
Leno4ka [110]

Answer:

Positive charges are eliminated by creating lithium vacancies, and for every Ca2+ ion added, a single lithium vacancy is formed.

Explanation:

The addition of calcium oxide as an impurity to lithium oxide creates an  interstices due to the replacement of the Lithium ion by calcium ion. The creation of  interstices is as a result of  the replacement of the positive ions (Lithium by calcium). To make the reaction neutral, these replacements must occur  when the interstices are formed

6 0
3 years ago
Determine whether each of the following cations is acidic or pH-neutral.
riadik2000 [5.3K]

Answer:

1. Acidic

2.Acidic

3, Acidic

All are acidic

5 0
3 years ago
(Science)<br>(image attached)<br>Pls help, due tmr​
Lelu [443]

Answer:

4-wheeler

Explanation:

I was thinking that you could say this:

My design is that the 4-wheeler will detect, with the help of technology, when something is approaching or you are very close to it. As the object gets closer, it will beep faster and louder. When the 4-wheeler beeps really fast and really loud, it means that you are about to crash or you are in danger. It will stop and launch an airbag so you stay safe. When the 4-wheeler stops, it will make a signal to let people know that you have stopped.

I am so sorry if this wasn't the response that you were looking for.

Hope this helped!

6 0
3 years ago
Read 2 more answers
Which process creates two new cells from one existing cell in order to maintain homeostasis? (4 points) a Cell division b Cellul
Savatey [412]

Answer:

Cell division creates an equal number of cells in different parts of the body.

Explanation:

Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle.

5 0
3 years ago
Other questions:
  • What element has a total of 3 p-sublevel electrons?
    5·1 answer
  • "The combustion of ethylene proceeds by the reaction C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(g) When the rate of disappearance of O2 i
    8·1 answer
  • How does positive catalyst increase the rate of chemical reaction?​
    12·1 answer
  • Which of these events is caused by contact forces?
    15·1 answer
  • In this experiment, you will measure all masses in
    5·1 answer
  • The sodium salt, NaA, of a weak acid is dissolved in water; no other substance is added. Which of these statements (to a close a
    6·1 answer
  • 1. Which phase change is accompanied by the release of heat? A) H20(s)--&gt; H2O(g) B) H20(l) -&gt;H2O(s) C) H20(l)→ H2O(g) D) H
    12·1 answer
  • How do scientists use radioactive decay to date fossils and artifacts
    10·1 answer
  • Someone help please ...
    13·1 answer
  • 9 Some people say that something that does not
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!