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
musickatia [10]
2 years ago
12

NEED HELP! SCIENCE HW IS DUE IN 1 HOUR!!!!!!!!

Chemistry
1 answer:
almond37 [142]2 years ago
6 0

Answer:

hair is a physical change.

Cooking is a physical and chemical change.

Ice cream melting in the sun is a physical change.

mark me as the best if this helps you

You might be interested in
0.023 M solution of perchloric acid
kogti [31]
The original question is to find the pH and the pOH of 0.023 M of perchloric acid.

Answer:
pH = 1.638
pOH = 12.362

Explanation:
1- getting the pH:
pH can be calculated using the following rule:
pH = -log[H+]
Since the given solution is an acid, this means that [H+] is the same as the concentration of the solution.
This means that:
[H+] = 0.023
Substitute in the above equation to get the pH as follows:
pH = -log[0.023]
pH = 1.638

2- getting the pOH:
We know that:
pH + pOH = 14
We have calculated that pH = 1.638.
Substitute in the above equation to get the pOH as follows:
pOH + 1.638 = 14
pOH = 14 - 1.638
pOH = 12.362

Hope this helps :)
5 0
3 years ago
Which lists the waves in order of frequency, from highest to lowest?
Ulleksa [173]

Answer:

C

Explanation:

I just aswered this question and i got it right

7 0
3 years ago
Read 2 more answers
What is on the periodic table of elements? *<br> Molecules<br> O<br> Elements
alexandr1967 [171]

answer: elements are on the periodic table

8 0
3 years ago
Which or these equations is balanced H2SO4 + 2Al &gt; Al2(SO4)3 + H2 or 2KCl + Pb(NO3)2 &gt; 2KNO3 + PbCl2
Dmitry_Shevchenko [17]

Balancing of chemical equation is essential because of the law of conservation of mass, which states that the mass of a system can not be created or removed.

The second equation is balanced

2KCl_(_a_q_) +Pb(NO_3)_2_(_a_q_) ==> 2KNO_3_(-a_q_) + PbCl_2(_a_q_)

This is because the number of elements of each atom in the product side equal the number of elements of each atom on the reactant side.

The first equation is not balanced

H_2SO_4 _(_a_q) + 2Al_(_s_) ==> Al(SO_4)_3_(_a_q_) + H_2_(_g_)

This is because there is 1 molecule of SO_4^{-2} on reactant side as compared to 3 molecules of SO_4^{-2}

To balance the equation we add a coefficient of 3 on sulphuric acid (H_2SO_4) and a coefficient of 3 on hydrogen (H_2)

3H_2SO_4_(_a_q_) + 2Al_(_s_) ==> Al(SO_4)_3_(_a_q_) + 3H_2_(_g_)

7 0
3 years ago
What must happen for heat to be transferred by convection?
Inessa05 [86]

Answer: The heat transfer by convection requires a solid-fluid interface, a temperature difference between the solid surface and the surrounding fluid and a motion of the fluid. The process of heat transfer by convection would occur when there is a movement of macro-particles of the fluid in space from a region of higher temperature to lower temperature.

Mark as brainliest

6 0
3 years ago
Other questions:
  • If the mass of 293nv is 293.10 amu and that of 295nv is 295.45 amu , what is the atomic weight of nv?
    7·1 answer
  • A partially-enclosed coastal region where sea water mixes with freshwater is called a(n) _______.
    14·1 answer
  • What type of reaction provide energy within a red giant star?<br><br> and how come?
    7·1 answer
  • The images show two metamorphic rock samples.<br> Which statement accurately describes these rocks
    14·1 answer
  • Why are the outer-most electrons the only ones included in the electron dot<br> diagram?
    8·1 answer
  • What is a hypothesis
    8·2 answers
  • Using a meter stick and a ruler with millimeter and centimeter gradations, measure the following objects and record their measur
    12·1 answer
  • Acetyl-CoA labeled with 14C in both of its acetate carbon atoms is incubated with unlabeled oxaloacetate and a crude tissue prep
    10·1 answer
  • Which group on the periodic table are the last reactive? A alkali metals B alkaline earth metals C halogens D noble gases
    8·1 answer
  • Energy pyramid worksheet
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!