Which substance, when dissolved in water, forms a solution that conducts an electric current?(1) C2H5OH (3) C12H22O11
(2) C6H12O6 (4) CH3COOH

Answers

Answer 1

Answer:

Answer: Option (4) is the correct answer.

Explanation:

Substance which are able to conduct electricity are ionic in nature. This means that only ionic substances can conduct electricity because they dissociate into ions.

Therefore, out of the given options only acetic acid $(CH_(3)COOH)$ is ionic in nature.

$CH_(3)COOH \rightleftharpoons CH_(3)COO^(-) + H^(+)$

Though $CH_(3)COOH$ is a weak acid but it does dissociate into ions and hence, it forms a solution that conducts an electric current.

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What mass of a 60.0-gram sample of N-16 will remain unchanged after 28.8 seconds?

Answers

The answer is 3.75 g.

Half-life is the time required for the amount of a sample to half its value.
To calculate the fraction of the sample remained unchanged, we will use the following formulas:
1. $(1/2)^(n) = x$ ,
where:
n - a number of half-lives
x - a remained fraction of a sample

2. $t_(1/2) = (t)/(n)$
where:
$t_(1/2)$ - half-life
t - total time elapsed
n - a number of half-lives

The half-life of N-16 is 7.13.
So, we know:
t = 28.8 s
$t_(1/2)$ = 7.13 s

We need:
n = ?
x = ?

We could first use the second equation, to calculate n:
If:
$t_(1/2) = (t)/(n)$ ,
Then:
$n = (t)/( t_(1/2) )$
⇒ $n = (28.8 s)/(7.13 s)$
⇒ $n=4.04$
⇒ n ≈ 4

Now we can use the first equation to calculate the remained amount of the sample.
$(1/2)^(n) = x$
⇒ $x=(1/2)^4$
⇒ $x= (1)/(16)$

If the fraction of the sample is 1/16 = 6.25%, then the mass of the sample could be calculated as:
x g : 6.25% = 60 g : 100%
x =

Which period is older than the Triassic period? Cambrian Cretaceous Jurassic Paleogene.

Answers

The Triassic period is one of the geological periods and is the shortest of the Mesozoic era. Cambrian is the older era than the Triassic period.

What is Cambrian and triassic period?

The Triassic period existed 250 -200 million years ago and started after the vastest and most extreme devastation ever. It is the 1st period of the Mesozoic and is known for the movement of the Dinosaurs on the land, flying pterosaurs and swimming plesiosaurs and ichthyosaurs.

The Cambrian is the period of the Paleozoic era and is the most important period because of the appearance of many animals. In this period, the temperature raised on the planet and the ice sheets melted at a very dangerous rate leading to mass devastation.

Therefore, option A.Cambrian is older than the Triassic period.

Learn more about Cambrian and Triassic periods here:

brainly.com/question/11417834

Answer:

A: Cambrian!

Explanation:

got it right on ed :)

which of the following is not a mixture? a)antibiotic b)evaporated milk c)brewed coffee d)hydrogen chloride

Answers

Answer:

d) Hydrogen chloride

Explanation:

Hydrogen chloride (HCl) is not a mixture. It is a chemical compound composed of two elements, hydrogen (H) and chlorine (Cl), combined in a fixed ratio. In contrast, the other options (antibiotic, evaporated milk, brewed coffee) all involve mixtures:

Antibiotics are typically mixtures of various chemical compounds used for medicinal purposes.

Evaporated milk is a mixture of milk and water with the water removed.

Brewed coffee is a mixture of water and coffee grounds, often with other components like sugar or cream added.

Hydrogen chloride, on the other hand, is a pure compound with a defined chemical formula (HCl) and consistent composition.

How many protons and electrons are in an atom of sodium whose atomic number is 11?

Answers

Atomic number is also known as proton number, so it would have 11 protons. Assuming you mean a neutral atom, it will have to have an equal number of electrons to protons, so it has 11 electrons too

Final answer:

An atom of sodium, with an atomic number of 11, has 11 protons and 11 electrons. The atomic number is indicative of both the number of protons in an atom and, in a neutral atom, the number of electrons.

Explanation:

The atomic number of an element corresponds to the number of protons in the nucleus of its atom. So, an atom of sodium whose atomic number is 11 has 11 protons. As the atom is neutral, it also means that the atom will have 11 electrons to balance the 11 positive charges of the protons. This information can be found on the periodic table, which gives the atomic number and the atomic mass of each element.

Learn more about Atomic Structure here:

brainly.com/question/7328982

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Based on reactivity, which of the following elements can replace iron (Fe) in a compound during a single replacement reaction?Al
Cu
F
Co

Answers

Answer: Option (a) is the correct answer.

Explanation:

Based on reactivity series, the reactivity of some metals in decreasing order is as follows.

Li, K, Ba, Ca, Mg, Al, Mn, Zn, Cr, Fe, Co, Ni

Thus, it can be seen that Al is more reactive than Fe, so it will replace iron in a single displacement reaction. Whereas cobalt is less reactive than iron hence, it will not replace Fe.

Fluorine being an anion will not replace a cation because in displacement reactions, only a cation can replace another cation and an anion can replace another anion.

Hence, we can conclude that Al will replace iron (Fe) in a compound during a single replacement reaction.

based on reactivity, the elements that can replace iron in a compound during a single replacement reaction would be :
Al

Because its higher than the other options in reactivity series

hope this helps

Knowing the chemical properties of a substance will tell you how the substancea. looks.
c. can be broken down into atoms.
b. smells.
d. reacts with other substances.

Answers

Whereas physical properties of a substance tells us about how the substance looks, smells, etc, the chemical properties of a substance basically tells us how the substance will react with other substances. Therefore, knowing the chemical property of a substance tells us how the substance reacts with others.Hope this helps. Let me know if you need additional help!

d. reacts with other substances.

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