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
vovikov84 [41]
3 years ago
14

Choose all the correct information concerning chemical reactions: Involves small amounts of energy. Some of the mass is converte

d into energy. Involves large amounts of energy. Only electrons are involved. The mass remains the same. Involves the nuclei of the atoms.
Chemistry
2 answers:
suter [353]3 years ago
8 0
<span>A chemical reactions :
Involves small amounts of energy.
</span><span> Only electrons are involved.
</span><span>The mass remains the same.</span>
viva [34]3 years ago
8 0
The correct answers are:
<span>Involves small amounts of energy.
</span><span>Only electrons are involved.
</span><span>The mass remains the same.</span>

You might be interested in
Can salt dissolve in hydrogen peroxide? Pls help me
Genrish500 [490]

Answer:

Yes it can!!

Explanation:

Hydrogen peroxide mixed with sodium is known as oxygen bleach. Add water and the compound releases an oxygen molecule to help it lift mold and stains from the surface of natural materials.

3 0
3 years ago
How many milligrams of AgNO3 is required to completely react with 81.5 mg LiOH?
BartSMP [9]

Answer:

m_{AgNO_3}=577.6mg

Explanation:

Hello there!

In this case, according to the given chemical reaction, it is first necessary to compute the moles of reacting LiOH given its molar mass:

n_{LiOH}=81.5mg*\frac{1g}{1000mg}*\frac{1mol}{23.95g}  =0.0034molLiOH

Thus, since there is a 1:1 mole ratio between lithium hydroxide and silver nitrate (169.87 g/mol) the resulting milligrams turn out to be:

m_{ AgNO_3}=0.0034molLiOH*\frac{1molAgNO_3}{1molLiOH} *\frac{169.87gAgNO_3}{1molAgNO_3} *\frac{1000gAgNO_3}{1gAgNO_3} \\\\m_{AgNO_3}=577.6mg

Best regards!

7 0
2 years ago
Use the amount (mol) of solute and amount (mol) of solvent to calculate the mole fraction. An aqueous solution of ethanol, CH3CH
Blizzard [7]

Answer:

%m/m = 0.9975%

Xₐ = 0.0039

Explanation:

In order to do this, we need various data. First to all, we need tje molecular mass of the ethanol. this can be obtained in handbooks, or simply taking the atomic weights of carbon (12 g/mol), Hydrogen (1 g/mol) and oxygen (16 g/mol) and summing those values:

MM C₂H₆O = (2*12) + (6*1) + (16*1) = 46 g/mol

Now, there is an expression that is commonly used to determine the molarity of a solution given the mass percent and density, and assuming of course, 1 liter of solution:

M = d * %m/m * 1000 / MM * 100     (1)

From here, we can solve for %m/m:

%m/m = M * MM * 100 / d * 1000

As the problem is not saying the volume of solution, we can easily assume we have 1 liter of solution. Therefore, the %m/m replacing the given data is:

%m/m = 0.216 *46 * 100 / 0.996 * 1000

<h2>%m/m = 0.9975%</h2>

To get the mole fraction, we first need to get the volume of solvent. From the density, we can get the mass of solution:

m = V * d

m = 1000 * 0.996 = 996 g of solution.

The mass of solute is:

m = 0.216 mol/L * 46 g/mol

m = 9.936 g/L, or simply we have 9.936 g of ethanol in 1 L of solution.

The mass of solvent:

solvent = 996 - 9.936 = 986.064 g

The molecular mass of water, so we can get the moles is 18 g/mol so:

moles water = 986.064 / 18 = 54.78

Finally the mole fraction:

Xₐ = 0.216 / (0.216 + 54.78)

<h2>Xₐ = 0.0039</h2>

Hope this helps

4 0
3 years ago
One half of a balanced chemical equation is shown. 3Mg(OH)2 + 2H3PO4
nasty-shy [4]

Answer:

3Mg(OH)2 + 2H3PO4 = Mg3(PO4)2 + 2H3O

Explanation:

8 0
3 years ago
When a solution contains the maximum amount of solute at a given temperature the solution is
vitfil [10]

Answer:

Saturated.

Explanation:

Saturated means that at a given temperature, the amount of solute present is equivalent to the amount of solute that the solution is able to hold.

4 0
3 years ago
Other questions:
  • What are common names for antimony ? for science
    9·1 answer
  • How many mole are in 72.9g of HCI
    9·1 answer
  • 2
    8·1 answer
  • In an investigation with density, Marcia’s teacher measures the mass and volume of 10 different samples of a substance. The samp
    8·2 answers
  • What is the number of moles of chemical units represented by 9.03x10^24? And how do I show work? (DUMB IT DOWN PLEASE)
    12·1 answer
  • If 25.4 grams of water react to form 2.8 grams of hydrogen, how many grams of oxygen must simultaneously be formed?
    10·2 answers
  • Not a very good question but if anyone is good at chemistry, can you leave some tips below? I'm having lots of trouble in that s
    13·1 answer
  • Calculate the percent composition for each element in each of the following compounds.
    6·1 answer
  • Cl2+2KI→2KCl + I2 is an example of which type of reaction?
    13·1 answer
  • How to describe a ufo??​
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!