Match the following pls

Answer:

The electrochemical equivalent of copper, Cu, is 3.29015544 × 10⁻⁷ g/C

Explanation:

The given parameters are;

The element for which the electrochemical equivalent is sought = Copper

The atomic mass of copper = 63.5

The electrochemical equivalent, 'Z', of an element or a substance is the mass, 'm', of the element or substance deposited by one coulomb of electricity, which is equivalent to a 1 ampere current flowing for a period of 1 second

Mathematically, we have;

m = Z·I·t = Z·Q

We have;

Cu²⁺ (aq) + 2·e⁻ → Cu

Therefore, one mole of Cu, is deposited by 2 moles of electrons

The charge carried one mole of electrons = 1 Faraday = 96500 C

∴ The charge carried two moles of electrons, Q = 2 × 96500 C = 193,000 C

Given that the mass of an atom of Cu = 63.5 a.m.u., the mass of one mole of Cu, m = 63.5 g

[tex]Z = \dfrac{m}{Q} = \dfrac{63.5 \ g}{193,000 \ C} = 3.29015544 \times 10^{-4} \, g \cdot C^{-1}[/tex]

∴ Z = 3.29015544 × 10⁻⁴ g/C = 3.29015544 × 10⁻⁷ g/C

The electrochemical equivalent of copper, Cu, is Z = 3.29015544 × 10⁻⁷ g/C

Answer:

Answered below

Explanation:

1) Atomic number is usually the number of protons

Since the atom is a neutral atom, Number of protons is equal to the number of electrons.

Thus means that we have 9 electrons and our atomic number is 9.

Atomic mass number is given as 20.

The is topic notation makes use of the atomic number and mass number.

Atomic number of 9 denotes fluorine.

Thus, the isotopic notation is written as attached;

2) we are told that an atom has 13 protons and 12 neutrons.

Similar to A above,

Atomic number is 13.

Now, number of neutrons + number of protons = mass number.

Thus;

Mass number = 13 + 12 = 25

Element with atomic number of 12 is magnesium

Thus,isotopic notation is as attached.

Answer:

False

there is three

Explanation:

Three laws are combined together which is further known to us as Newton ’s three laws of motion. These three newton’s laws of motion are: Law I – Newton’s first law of motion Law II – Newton’s second law of motion

Hope this helps :)

Answer:

Sodium oxide NA2O

2) N8CL

3) HO2

4) LISO3

Answer:

Sodium oxide NA2O

2) N8CL

3) HO2

4) LISO3

Explanation:

Answer:

Cold water

Explanation:

A simple way to solve this kind of problems is to keep in mind that:

Solids have stronger intermolecular attractive forces than liquids, and liquids have stronger forces than gases.

Cold water behaves more similarly to solids than hot water. Conversely, hot water behaves more similarly to gases than cold water. Thus, cold water has stronger intermolecular attractive forces than hot water.

Answer:

its c

Explanation:

because i have the most wrinkly brain

If you find yourself rushing to complete many different tasks at once, it may be useful to clarify the deadlines for each of the tasks with your boss.

It is common in an office setting to be assigned many tasks to be completed within a short time frame. However, all these tasks must be prioritized in order.

Hence, If you find yourself rushing to complete many different tasks at once, it may be useful to clarify the deadlines for each of the tasks with your boss.

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Answer:

Blood and water

Explanation:

Explanation:

2Mg + O2 ➖ 2MgO

hope it helps

Answer:

B their larger size . this is right

Answer:

The answer is B. here is proof. Plz mark brainliest.

Explanation:

0.279 g He

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

4.20 × 10²² molecules He

Step 2: Identify Conversions

Avogadro's Number

[PT] Molar Mass of He - 4.00 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.278997 g He ≈ 0.279 g He

Answer:

They are listed below

Explanation:

The 5 things that the periodic table includes are;

1. Name of the element

2. The symbol of the element

3. Atomic number of the element

4. Relative atomic mass

5. Electron configuration

Answer:

170 grams NaCl

Explanation:

Find the mass of NaCl by adding the two elements atomic mass

Na: 22.99

Cl: 35.45

22.99+35.45=58.44 g

Convert moles to grams.

2.91 mol NaCl * 58.44 g NaCl= 170.0604 g

Answer: D

Explanation: I got it right

In chromatography,when all the three samples have atleast one substance common it is indicated by Rf values which are same for the 3 samples as they have one substance common in them.

Chromatography is a separation technique which is generally used for separating substances  based on their solubilities. The technique makes use of two phases the mobile phase and the stationary phase.

The components are separated from each other based on their solubility in the mobile phase. Component which is least soluble does not travel along the mobile phase while component which is highly soluble travels with the mobile phase.

The difference in the solubility of the components is measured with the reference to the solvent front and is expressed in terms of Rf value.

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Answer: Gamma particles

Answer:

Gamma rays, are the fastest.

Explanation:

They literally move at the speed of light, I hope this helps you.

Answer: C. [tex]2HgO\rightarrow 2Hg+O_2[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The skeletal chemical equation will be:

[tex]HgO\rightarrow Hg+O_2[/tex]

The balanced chemical equation will be:

[tex]2HgO\rightarrow 2Hg+O_2[/tex]

The correctly balanced chemical equation for the reaction [tex]HgO - > Hg + O_{2}[/tex] is: C. [tex]2HgO - > 2Hg + O_{2}[/tex]

The law of conservation of mass states that mass can neither be created nor destroyed; it can only be transferred from one location to another. As a result, the mass of the products is required to be the same as the mass of the reactants.

On both the  reactant and product sides of the reaction, the identical amount of atoms of each element is required. Therefore, the equations used in chemistry are balanced.

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Answer:

= 0.4448 mol

Explanation:

id.k frfr

Answer: 5.6L

Explanation:

Just did it on an assignment

A 3.5L flexible container holds a gas at 250K. The new volume will be 5.6 L, if the temperature is increased to 400K.

Charles law is an ideal gas law which states that at a constant pressure volume of a gas is directly proportional to the absolute temperature.

It is expressed as

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

where,

V₁ = initial volume

T₁ = initial temperature

V₂ = final temperature

T₂ = final temperature

Now put the values in above formula, we get

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

[tex]\frac{3.5\ L}{250\ K} = \frac{V_2}{400\ K}[/tex]

[tex]V_{2} = \frac{3.5\ L \times 400\ K}{250\ K}[/tex]

[tex]V_{2} = \frac{1400}{250}[/tex]

V₂ = 5.6 L

Thus, from the above conclusion we can say that A 3.5L flexible container holds a gas at 250K. The new volume will be 5.6 L, if the temperature is increased to 400K.

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Answer:

80 g/mol

Explanation:

The Relative formular mass is the sum of the relative atomic masses of the elements present in the molecule.

TiO2;

There is one Ti atom and 2 O atom. Their atomic masses is given as;

TiO2 = 48 + 2(16) = 48  + 32 = 80 g/mol

Answer:

Explanation:

The responding variable always is measured against the variable that you have control over.

In this case, you have control over the volume of air.

The responding variable is the amount the plant has grown.  This would be a good long term experiment to try for a science fair or just because you might be interested. It's a good simple idea.

Answer:

A

Explanation:

Selective Breeding

Is your answer because if you look closely to the pic you see the process

Hope this helps:)

Pls mark brainlist

Answer:

A

Explanation:

Answer:

A and B

Explanation: Dermal tissue functions to protect the plant from injury and water loss.

Answer:

It allows all the plants to have one genetic

Answer:

75π{¢ because of the snajabvahajhakavsnsbdjbdbfnf

Explanation:

bznsvnsns

Answer: The mass number of X is 218.

Explanation:

Alpha decay : When a larger nuclei decays into smaller nuclei by releasing alpha particle. In this process, the mass number and atomic number is reduced by 4 and 2 units respectively.

General representation of an element is given as:   [tex]_Z^A\textrm{X}[/tex]

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

General representation of alpha decay :

[tex]_Z^A\textrm{X}\rightarrow _{Z-2}^{A-4}Y+_2^4\alpha[/tex]

[tex]_{86}^{222}\textrm{Rn}\rightarrow _{84}^{218}\textrm{Po}+_2^4\textrm{He}[/tex]