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
Novay_Z [31]
3 years ago
5

What is a stock solution?

Chemistry
1 answer:
Yakvenalex [24]3 years ago
3 0
The answer is B a con betrayed solution...
You might be interested in
a student balanced the chemical equation for the reaction of magnesium with oxygen by writing Mg + O2 ----> MgO2. What is wro
egoroff_w [7]

Answer:

Explanation:

Magnesium when it oxidizes has a valence of 2.

Oxygen, when it mixes with something, has a valence of - 2

So Mg and O2 will form something, but what? The answer is MgO

Mg + O2 ===> MgO

To balance this equation, you need 2 Magnesiums on the right and 2 Oxygens also on the right. The left will need a  two Magnesiums.

The balanced equation will be

2Mg + O2 ====> 2MgO

6 0
4 years ago
Q. Which change has a negative entropy change of the system
Effectus [21]

Answer:

D) none of these

Explanation:

5 0
3 years ago
Read 2 more answers
Translate the skeleton chemical equation:
Minchanka [31]

Answer:

MgBr₂ + AgNO₃ => Mg(NO₃)₂ + AgBr

Explanation:

Find the element symbol and charge of each element on the periodic table. For polyatomic ions (nitrate), reference your polyatomic ions chart. Use the "partner's charge" rule to find the number of atoms in each compound.

Charges are written as superscripts. "1" is usually not written, just the + or - sign. The charge of silver is 1, which is the (I) bracket roman numeral 1. It is indicated like that because it is multivalent, meaning it has more than one possible charge.

<u>Write each element as an ion</u> (with the charge).

Magnesium is Mg²⁺

Bromide is Br⁻

Silver(I) is Ag⁺

Nitrate is (NO₃)⁻

<u>Write each compound.</u>

REACTANTS SIDE

Magnesium bromide

Mg²⁺Br⁻    Cross over the partner's charge. Since Br is charge 1, Mg has 1 atom. Since Mg has charge 2, Br has 2 atoms.

MgBr₂

Silver(I) nitrate

Ag⁺(NO₃)⁻

AgNO₃       Both have 1 atom because each partner's charge was 1. You do not need to write brackets if nitrate only has 1 atom.

PRODUCTS SIDE

Magnesium nitrate

Mg²⁺(NO₃)⁻

Mg(NO₃)₂      Nitrate has 2 atoms because magnesium's charge is 2.

Silver(I) bromide

Ag⁺Br⁻

AgBr       Both have 1 atom.

Write the compounds into an equation. Reactants go on the left side, products go on the right side. Between the reactants and products, write an arrow.

MgBr₂ + AgNO₃ => Mg(NO₃)₂ + AgBr

6 0
4 years ago
When 5.00 g of NH4NO3 is dissolved in 100.0 g of water in a styrofoam cup, the T = - 3.82 ^°C. Is the process of dissolving ammo
miv72 [106K]

Answer:

The process is endothermic.

Heat is 26,9 kJ/mol

Explanation:

The dissolution of NH₄NO₃ in water is:

NH₄NO₃ → NH₄⁺ + NO₃⁻

As the change of temperature in the cup is ΔT = -3,82°C

<em>The process is endothermic</em>. Because the temperature is decreasing in the process. That means the process needs heat.

Assuming the  heat capacity of the solution is 4.18 J/Kg :

q = -C×m×ΔT

Where q is heat, C is heat capacity (4,18J/Kg), m is mass (105g) and ΔT is change in temperature (-3,82°C)

q = 1677 J ≈ <em><u>1,68kJ</u></em>

The moles of NH₄NO₃ dissolved are:

5,00g × (1mol / 80,043g) = <em><u>0,0625 moles</u></em>

That means heat of this process in kJ/ mol is:

1,68kJ / 0,0625moles = <em>26,9 kJ/mol</em>

<em />

I hope it helps!

8 0
3 years ago
How many significant figures are in 0.0000003 g?
stiv31 [10]

Answer:

Therefore, none of the zeros is a significant figure and hence there is only one significant figure in this measurement in support G. The measurement is 0.7 minutes. Here again, zero is not a significant figure and therefore the only significant figure is one which is seven in support Edge.

Explanation:

6 0
2 years ago
Read 2 more answers
Other questions:
  • The electron configuration can also be represented by writing the symbol for the occupied subshell and adding a superscript to i
    10·1 answer
  • It takes 36 minutes for 100-grams of a radioactive substance to decay to 25-grams. What is the half-life of this substance?
    10·2 answers
  • Choose the thermochemical equation that best illustrates ΔH°f (enthalpy of formations) for Li2SO4. A) 2 Li+(aq) + SO42-(aq) → Li
    12·1 answer
  • An ideal gaseous reaction (which is a hypothetical gaseous reaction that conforms to the laws governing gas behavior) occurs at
    12·1 answer
  • Which of the following is an example of improved functioning as related to the benefits of muscular strength and endurance train
    5·2 answers
  • A neutron walks into a gas station to buy some snacks. He ask the cashier ,"How much"? The cashier replies,"For you? No charge."
    14·1 answer
  • What enzyme catalyzes carbohydrates in the mouth?
    14·1 answer
  • The chemical mixture that composes our atmosphere is called ________.
    14·1 answer
  • When 80.0 grams of calcium chloride react with silver nitrate, how many grams of silver
    5·1 answer
  • *20 points* Pls answer questions in a positive way NO LINKS NO FILES Thank you
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!