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
Trava [24]
3 years ago
9

State whether the following is an example of a physical or chemical change:! 21. Burning a log: ________________________________

! 22. Folding a piece of paper: _________________________! 23. Freezing water: _________________________! 24. Bending a copper wire. _________________________!
Chemistry
2 answers:
lyudmila [28]3 years ago
6 0

Answer:

Physical change

Explanation:

Because it doesn't require any chemical to change

Ivan3 years ago
5 0

Answer:

Physical change

Physical change

Physical change

Physical change

Explanation:

You might be interested in
_____ might be able to detect tumors based on its use of X-rays and ability to produce cross-sectional images of the brain.
MatroZZZ [7]

Answer: CAT (computerized axial tomography) scan

Explanation:

Computerized Axial Tomography (CAT) scan is an X-ray examination in which a computer generates images showing cross-section views of a patient's internal parts (brain, blood vessels and etc.)

CAT scan can identify normality and detect abnormalities (such as tumor and degenerated cells) in the internal organs and structures and hence, this information are used to guide other medical processes.

6 0
3 years ago
A fixed number of moles of an ideal gas are kept in a container of volume V and an absolute temperature T. If T and V are both d
liubo4ka [24]

Answer:

If the temperature and volume ot a gas increases, the r.m.s. velocity of the molecules in the gas will be 2  times the original r.m.s. molecular velocity.

If T doubles while V is held constant, the new net internal energy of the gas will be 2 times the original internal energy of the gas.

Explanation:

Temperature and root mean square velocity are directly proportional to one anoth. If the temperature increases, root mean square velocity also increases and vice versa, while temperature is also directly proportional to the internal energy of the gas molecules, higher the temperature, higher will be the internal energy and lower the temperature so internal energy will be decreased.

8 0
3 years ago
Balance the following equation <br><br><br> _NaOH (aq) + _HNO3 (aq)&gt; _NaNO3 (aq)+ _H2O (1)
Vlada [557]
Its already balanced, no balancing required
6 0
3 years ago
How do you balance Na + MgF{2} Na + Mg?
cricket20 [7]
2Na+MGF2=2NAF+MG
I hope that's right :)
6 0
3 years ago
What is the ionic equation of Aqueous calcium bromide was mixed with aqueous gold(I) perchlorate, and a crystallized gold(I) bro
Bumek [7]

Answer:- 2AuClO_4(aq) + CaBr_2(aq)\rightarrow 2AuBr(s)+ Ca(ClO_4)_2(aq)

Explanations:- It's a double replacement reaction where a precipitate of silver(I)bromide is formed. A dpuble replacement reaction in general looks as AB + CD \rightarrow AD + CB

To balance the equation we need to multiply gold compounds on both sides by 2 and the balanced equation is..

2AuClO_4(aq) + CaBr_2(aq)\rightarrow 2AuBr(s)+ Ca(ClO_4)_2(aq)

6 0
3 years ago
Other questions:
  • A reaction produces .815 moles of H2O. How many molecules produces?
    14·2 answers
  • Which expression is equal to the number of milliliters(mL)in 12.5 liters(L)?
    7·2 answers
  • Where is the location of the non-metals on the periodic table​
    9·2 answers
  • What do you chemically call water???
    13·2 answers
  • How many valence electrons are transferred from the calcium atom to iodine in the formation of the compound calcium iodide?
    6·1 answer
  • In an aqueous solution of a certain acid the acid is 0.10% dissociated and the pH is 4.06. Calculate the acid dissociation const
    14·1 answer
  • As liquid water boils and changes into water vapor (steam), what happens
    15·2 answers
  • ANSWER FAST PLZ 25 POINTS!!!!!!!!!!!!!!!
    9·1 answer
  • What identifies an atom as iron atom?
    14·1 answer
  • As water boils, it becomes a gas. Which statement about a gas is correct?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!