Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH–] is 1 x 10–11 mol/L. Is this solution acidic, basic, or neutral? Show all work.
Answers
Then
And here is the solution - as you can see it is an acidic one :
I am pretty sure this answer will help you! Regards.
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How many molecules (not moles) of nh3 are produced from 6.62×10−4 g of h2?
Which of the following is a farming method that helps reduce the effects of wind erosion?
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–5.6 mc031-2.jpg 10–3 L
5.6 mc031-3.jpg 10–3 L
5.6 mc031-4.jpg 103 L
Answers
The correct way to represent 5600 L using scientific notation is written as 5.6 x 10³ L.
What is Scientific notation?
Scientific notation or standard form is method of representing large numbers in more condensed form using power of ten.
The correct way to represent 5600 L using scientific notation is written as follows;
5600 L = 5.6 x 10³ L
Thus, the correct way to represent 5600 L using scientific notation is written as 5.6 x 10³ L.
Learn more about scientific notation here:brainly.com/question/325572
(1) Energy is emitted.
(2) Energy is absorbed.
(3) The number of electrons decreases.
(4) The number of electrons increases.
Answers
Answer: The correct option is (1).
Explanation:
Whenever an atom in an excited state returns back to its ground state the energy is emitted out in the form of the radiation and the value of energy emitted can be determined by using the expression:
Where E = Energy of the radiation in joules
h = Planck's constant =
= Wavelength of the radiation in meters.
It is emitted by photons in the form of light, or in some cases, heat.
Answers
The answer would be:
Pure substance: specifically a compound
Pure substances can be categorized into compounds and elements. A compound is a pure substance that cannot be broken down physically, but it can be broken down through chemical means. It is this property that differentiates it from mixtures. Mixtures can be broken down by physical and/or chemical means.
Elements on the other hand, cannot be broken down at all because it is in its simplest form and is also considered as a pure substance.
Answer:
Pure substance
Explanation:
Matter can be broadly classified into two categories: Pure substances and Mixtures (homogenous and heterogenous mixtures).
The simplest form of a pure substance is an element which cannot be broken down any further. When two or more elements combine, they form a compound which is also a pure substance. Thus, pure substances are systems that are either composed of a single type of element or a single type of molecule.
For example salt (NaCl) is a compound which is composed of elements: sodium (Na) and chlorine (Cl). These elements (in fact ions, Na+ and Cl-) are held together by a chemical bond. Thus, a pure substance like NaCl can be broken down into its elements through chemical means.
The unknown substance in the given question can therefore be classified as a pure substance
N2(g) + 3H2(g)2NH3(g)
What is the percentage yield when 60 kg of ammonia is produced from 60 kg of hydrogen?
A
5.9%
B
17.6%
с
35.3%
D
50.0%
Answers
Answer:
B
17.6%
Explanation:
1. Percentage yield = (Actual yield/theoretical yield) x 100
2. You know actual yield of ammonia (60kg) so you need to work out theoretical yield.
3. mols of hydrogen = m/mr = 60,000/2 = 30,000 mols.
4. 3:2 ratio so (30,000/3) x 2 = 20,000 mols of Ammonia.
5. Therefore mass of ammonia = mr x mols = 20,000 x 17 = 340,000 grams
6. So percentage yield is (60,000/340,000) x 100 = 17.6
(B) A catalyst reduces the ∆H of a reaction and hence the temperature needed to produce products.
(C) A catalyst reduces the activation energy for a reaction and increases the rate of a reaction.
(D) A catalyst increases the equilibrium constant and final product concentrations