Which substance is an electrolyte
1) CCl4
2)SiO2
3)C6H12O6
4) H2SO4

Answers

Answer 1

Answer:

The substance that has been acting as an electrolyte from the given molecules is sulfuric acid. Thus, option 4 is correct.

Electrolytes have been defined as the chemical substances that has been dissociated into constituent ions when dissolved in the aqueous solution.

Identifying electrolytes

The ionic compounds are bounded by weak intermolecular forces and are dissociated into ions in the solution. Thus, the compounds are given as electrolytes.

The covalent bonded molecular atoms are not dissociated into ions and are not considered as electrolytes.

The substance that has been acting as an electrolyte from the given molecules is sulfuric acid. Thus, option 4 is correct.

Learn more about electrolytes, here:
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Answer 2

Answer: Electrolyte is any species which when dissolved in solvent particularly water dissociates into cations and anions. Electrolytes are conductors of electricity. In given options;

CCl₄ (Tetrachloromethane) is a covalent compound. And it doesn't dissociate to any cation or anion. So it is not electrolyte.

SiO₂ (Silicon Dioxide) is also covalent in nature and exist in giant framework. It is not electrolyte.

Glucose (C₆H₁₂O₆) is also covalent compound. And doesn't produced any ion in water, hence it is not electrolyte.

H₂SO₄ (Sulfuric acid) is Electrolyte. When it is dissolved in water it produces H⁺ and SO₄²⁻ ions as follow,

H₂SO₄ → 2 H⁺ ₍aq₎ + SO₄²⁻ ₍aq₎

Result:
H₂SO₄ is electrolyte.

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Which of these are physical changes in matter check all that apply .
What is the total number of moles of hydrogen atoms contained in 1 mole of (nh42c2o4?
Find volume of 1 mole of helium gas when the pressure is 1.46 atm and the temperature is 270k
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How many identical double strands of DNA will be present after three rounds of replication?four
six
eight
nine

Answers

Answer:

eight

Explanation:

In the first stage of DNA replication each DNA molecule replicates into two daughter DNA. In the second stage of DNA replication each of the two daughter DNA molecule replicates into two daughter DNA, thus forming a total of four DNA molecules. In the third stage of DNA replication each of the four daughter DNA molecule replicates into two daughter DNA, thus forming a total of eight DNA molecules.

Every time you replicate DNA you get 2 new DNA and 1 strand of each DNA is composed of the parent strand. So after 3 rounds of replication....
1 --> 2 ---> 4 ---> 8
Out of these 8, 2 of them contain the parent strands. So 2/8 = 1/4 = 25%

Thus the answer is the third option, eight (8).

Alexis predicts that the size of a magnet affects its magnetic properties. She designs anexperiment using magnets of different sizes and paperclips to test her prediction. She takes
three magnets of different sizes (one small, one medium, and one large) and holds them over
a container of paperclips to see how many are attracted. Her results are shown in the table
below.
What should Alexis do next after examining her experimental results?

Answers

Answer:

Alexis should conduct more trials to see if there is a correlation between magnet size and magnetic properties.

Explanation:

How many mole are in 2.84*10^22 molecules of h2

Answers

Avogadro's Number and the Mole. The mole is represented by Avogadro's number, which is 6.022×1023 atoms or molecules per mol.

Which subatomic particles each have a negative electrical charge?A) protons
B) neutrons
C) electrons

Answers

Answer: Option (C) is the correct answer.

Explanation:

Each element contains three sub-atomic particles which are protons, neutrons and electrons.

Inside the nucleus of an atom, there will be only protons and neutrons. Whereas electrons revolve around the nucleus of an atom.

Protons have a positive charge, neutrons have no charge and electrons have a negative charge.

Thus, we can conclude that electrons are the subatomic particles and each of them have a negative electrical charge.

C) electrons have a -ve charge.

Which element has chemical properties that are most similar to the chemical properties of sodium?(1) beryllium (3) lithium
(2) calcium (4) magnesium

Answers

Check out your periodic table. Elements in the same column (families) usually share similar properties because they have the same number of valence electrons. In this case, the only element listed that is part of Sodium's family is Lithium, so Lithium is most similar to Sodium.

Final answer:

Lithium is an element that has chemical properties most similar to sodium.

Explanation:

Out of the given options, lithium is the element that has chemical properties most similar to sodium.

Sodium and lithium are both in Group 1 of the periodic table, also known as the alkali metals. Alkali metals have similar properties because they all have one valence electron, which makes them highly reactive.

For example, like sodium, lithium reacts vigorously with water to produce hydrogen gas and a hydroxide:

2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g)

Learn more about Chemical properties here:

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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 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.

The answer is Cl- or A. Hope it helps

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H-H-C=C-H-H + Br—Br —> H-H-Br- C-C-H-Br-H