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skad [1K]
3 years ago
14

Which of the following is an anion? Question 20 options: O2- Al3+ Mg2+ H

Chemistry
2 answers:
bogdanovich [222]3 years ago
7 0

the answer is O2-

hope this helps


MariettaO [177]3 years ago
4 0
Anion is an atom with a negative charge
so in this case it woulld be O2-
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Given the following reactions and subsequent ∆H values, what is the ∆H for the reaction below? 4CO2(g) + 2H2O(g) 2C2H2(g) + 5O2(
melisa1 [442]
The problem ask on which of the following reactions and subsequent values and the value is given on you question. Base on your data and also to my formulation, solution and further simplification about the problem and the given values, i came up with an answer of <span>∆Hrxn = 5∆Hf(O2(g)) + 2∆Hf(C2H2(g)) - 2∆Hf(H2O(g)) - 4∆Hf(CO2(g)).</span>
7 0
3 years ago
Hydrogen peroxide is oxidized with permanganate solution to produce oxygen gas by the following reaction:
monitta

The percentage yield of the oxygen gas is 60%.

<h3>What is the limiting reactant?</h3>

The reaction equation is;

2H^+ + H2O2 + 2MnO4 -> 2MnO2 + 4H2O + 3O2

Number of moles of hydrogen peroxide = 30/1000 * 0.30 M = 9 * 10^-3 moles

Number of moles of  potassium permanganate = 30/1000 * 0.30 M = 9 * 10^-3 moles

Now;

1 mole of H2O2 reacts with 2 moles of permanganate

 9 * 10^-3 moles of H2O2 reacts with  9 * 10^-3 moles * 2 moles/1 mole  

= 1.8 * 10^-2 moles

Hence, permanganate is the limiting reactant

b) The theoretical yield of oxygen is;

2 moles of oxygen produced 3 moles of O2

9 * 10^-3 moles oxygen  produced 9 * 10^-3 moles *  3 moles/2 moles

= 0.0135 moles

If 1 mole of O2 occupies 22.4 L

0.0135 moles of O2 occupies 0.0135 moles * 22.4 L/ 1 mole

= 0.302 L or 302 mL

c) Percentage yield of oxygen = 178 mL/ 302 mL * 100/1

= 60%

Learn more about percentage yield:brainly.com/question/27492865

#SPJ1

5 0
1 year ago
Chapter 5. You must show all your work. Solve the following problems. (a) (8 points) When a cold drink is taken from a refrigera
GuDViN [60]

Answer:

see explanation below

Explanation:

To do this, we need to use the Newton's law of cooling which is:

dT/dt = (k - Ts)

Where:

Ts: temperature of surroundings (In this case, 20 °C)

k: constant

t: time

Now, after we do the integrals of this, the general expression would be:

T(t) = Ce^kt + Ts  (1)

Now, with the first data, we need to calculate the value of C. This value will be the same after time has passed. You can see this as the concentration of the drink. As it's not experimenting any reaction, it's concentration remain the same, and only the temperature will change.

Now, to get the value of C, we can begin with the fact that at time = 0, temperature was 5°C so:

T(0) = Ce^k*0 + Ts

Replacing:

5 = Ce^1 + 20

5 - 20 = C*1

C = -15

Now that we have this, we can solve the first part of the problem

(i):

First, we need to get the value of k, we know the final temperature at t = 25, so we can solve for k, which is constant too, and then, calculate the temperature for t = 50 min

solving for k, with T = 10 °C, C = -15, Ts = 20 °C and t = 25 min:

10 = -15e^25k + 20

10 - 20 = -15e^25k

-10/-15 = e^25k

ln(-10/-15) = 25k

k = -0.405465/25

<em>k = -0.0162</em>

Now that we have k, let's calculate T after t = 50

T = -15e^(-0.0162)*50 + 20

T = -6.67 + 20

T(50) = 13.33 °C

(ii)

For this part, we only need to solve for t:

18 = -15e^(-0.0162)t + 20

18 - 20 / -15 = e^-0.0162t

0.1333 = e^-0.0162t

ln(0.1333) = -0.0162t

t = -2.0145/-0.0162

t = 124.37 min

8 0
3 years ago
Read the following sentences: “This substance on copper is green. It is called verdigris. Paola said, ‘In Spanish, the word for
Pachacha [2.7K]

Answer:

See below.

Step-by-step explanation:

The author is probably reminding us that knowing the origins of words helps us to remember what they mean.

If "verde" means "green", the "verd" in "verdigris" probably means that verdigris is green.

However, the "verd" in verdigris domes from other languages.

It was originally Latin "viride aeris" (green brass).

In old French it became "verte de Grèce" (green of Greece). The modern French spelling is "vert-de-gris" (green of grey).

The English word "verdigris" comes from the French words.

4 0
3 years ago
Household items that are substance or mixture
monitta

Oil and water.

Lemon juice and tea.

Honey and tea.

Milk and chocolate.

Coffee and cream.

Cream and sugar.

Flour and butter.

Cereal and milk.

5 0
3 years ago
Read 2 more answers
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