In the redox reaction below, which is the reducing agent? MnO2 (s) + 4H+(aq) + 2Clmc007-1.jpg (aq) mc007-2.jpg Mn2+(aq) + 2H2O(l) + Cl2(g)

Answers

Answer 1

Answer: Answer is:
Redox reaction: MnO₂ + 4H⁺ + 2Cl⁻ → Mn²⁺ + 2H₂O + Cl₂.
Cl⁻ lost one electron (two Cl⁻ lost two electrons) and change oxidation number to zero, so Cl⁻ is reducing reagent.
Mn change oxidation number from + 4 to +2, Mn is oxidizing reagent.
Hydrogen don't change oxidation number.

Answer 2

Answer:

The answer is Cl- or A. Hope it helps

Answer : Option A) Asking a question.

Explanation :

The step that the student just completed in the situation given above is asking a question.

As the student noticed that consumption of soda deceases their energy level, he asked the question to this why does this happens? this was the first step of using critical thinking skills to ask a question first analyze it and then perform and witness some experimental observations and come out with the conclusion.

But in this given example he just completed the first step of asking question. Therefore, the answer is asking a question which is option A.

$\boxed{\boxed{\bold{Further~explanation}}}$

The scientific method is carried out in several stages:

1. Observation,

2. Determine the problem

2. Data, collect information

3. Hypothesis

4. Experiments

5. Analysis

6. Conclusion

7. Compilation of laws or theories

In the context of the problem, students will experiment to study the effect of

So students issue a question which is why can affect their energy, Thus students have made the first 2 steps in the scientific method :

1. Observation of and the human's energy level,

2. Determine the problem that will be the basis of student research, namely the influence of the human's energy level.

Indirectly this student has obtained 2 variables to be examined, namely variable and human energy level, which can be changed according to conditions, which are chosen as fixed variables and which ones are independent variables.

So that the next step is collecting data and so on can be done immediately

If we look at other answer choices :

B. Evaluating a promotional claim

This stage is done after the results of the research have been obtained so that students can submit an evaluation of their learning outcomes

C. Adjusting a conclusion

This stage will be obtained after students have completed the analysis of the experimental data

So the most appropriate answer is A.Asking a question

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Keywords: scientific method, fixed variable, independent variable, asking a question, human energy level

Which of the following popular sayings is an example of a true scientific theory?Eating lots of carrots will improve your eyesight.It is safe to eat dropped food if you adhere to the 5-second rule.Drinking warm milk makes you sleepy.Touching toads gives you warts.

Answers

The carrot myth was invented by the English Airforce to hide their radar system during WW(1 or 2, I'm not sure). Dropped food doesn't matter because dust and bacteria the food touches are on it the moment it hits the ground. Touching toads doesn't give warts, however the poison he secretes from its skin (a toad is poisonous, not venomous) can irritate. So it must the warm milk.

Answer:

Yes

Explanation:

Rhea has a balloon that contains 0.5 mole of helium. how many particles of helium are in the balloon?

Answers

Answer:

$\boxed{3 * 10^(23)}$

Explanation:

1 mol of helium contains 6.022 × 10²³ atoms

$\text{Atoms of He} =\text{0.5 mol He} * \frac{ 6.022 * 10^(23) \text{ atoms He}}{\text{1 mol He}}= 3 * 10^(23) \text{ atoms He}$

The balloon contains $\boxed{3 * 10^(23) \text{ atoms of He}}$ .

69.253 helium particles are in the balloon.

What is helium particles?

Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with either one or two neutrons, depending on the isotope, held together by the strong force. Unlike for hydrogen, a closed-form solution to the Schrodinger equation for the helium atom has not been found.

A helium atom is an atom of the chemical element helium. Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with either one or two neutrons, depending on the isotope, held together by the strong force. Unlike for hydrogen, a closed-form solution.

Helium is the element which you can find on the upper right side of the periodic table with atomic number 2. It comes first amongst the family of the noble gases. Helium falls under inert gas since its outermost electron orbital is full with two electrons.

The answer is 69.253.

Learn more about helium, refer:

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A 1.0-gram piece of zinc reacts with 5 milliliters of HCl(aq). Which of these conditions of concentration and temperature would produce thegreatest rate of reaction?
(1) 1.0 M HCl(aq) at 20.°C
(2) 1.0 M HCl(aq) at at 40.°C
(3) 2.0 M HCl(aq) at at 20.°C
(4) 2.0 M HCl(aq) at at 40.°C

Answers

Answer : The correct option is, $(4):2.0MHCl(aq)\text{ at }40^oC$

Explanation :

Le-Chatelier's principle : It states that the change in the variables of the reaction, the equilibrium will shift in that direction where the effect will be minimum.

The rate of reaction is directly related to the concentration of the reactants and the temperature of the reaction.

If the concentration of the reactant increases, the equilibrium will shift in the forward direction that means the rate of reaction increases and if the concentration of the reactant decreases, the equilibrium will shift in the backward direction that means the rate of reaction decreases.

If the temperature of the reaction increases then rate of reaction also increases and vice-versa.

Thus, the rate of reaction is greater at high concentration and temperature.

Hence, the correct option is, $(4):2.0MHCl(aq)\text{ at }40^oC$

Seven vans each hold 6 passengers. Each passenger is carrying 20 candies divided equally among 5 small boxes. How many candies are on the vans? 840 candies 4200 candies 168 candies 120 candies

Answers

I believe the correct answer from the choices listed above is the first option. There are about 840 candies present on all vans present. We calculate it by multiplying the number of total passengers by the number of candies each passenger is carrying. Hope this answers the question.

840 candies: answer

Explanation:

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