The ratio of zinc to copper in some alloy is 2 to 5. If 60 kilograms of zinc are used, how many kilograms of copper are needed to make this alloy

Answer:

2.7×10⁻³ mole

Explanation:

Applying

Q = it.............. Equation 1

Where Q = amount of charge, i = current, t = time

From the question,

Given: i = 0.860 A, t = 5 minutes = (5×60) seconds = 300 seconds

Subsitute these values into equation 1

Q = (0.860×300)

Q = 258 C

If one mole of electron has a charge of 96500 C

Then, x mole of electron will have a charge of 258 C

1 mole ⇒ 96500 C

X moles ⇒ 258 C

Solve for X

X = (258×1)/96500

X = 2.7×10⁻³ mole

The question is incomplete, the complete question is;

Which statement about the relationship between laws, hypotheses, and theories is true?

A.

Laws that remain true over an extended period of time are considered theories.

B.

A theory that holds true for a long time is considered a law.

C.

If a law is not contradicted after a lot of testing, it may be considered a hypothesis.

D.

If a hypothesis is not contradicted after a lot of testing, it may be considered a law.

Answer:

If a hypothesis is not contradicted after a lot of testing, it may be considered a law.

Explanation:

A hypothesis is an intelligent guess which is put forward to explain a particular scientific observation. Hypothesis are temporary explanations that must be subjected to rigorous scientific investigation.

If a hypothesis holds true for some time it is regarded as a theory. The theory is also subjected to further rigorous scientific experiments to see if it can be regarded as a law.

If the statement of the hypothesis is not contradicted after a lot of testing, it may be considered a law.

The image of the structure is attached in the image below.

Answer: The correct option is a.) 4-methyl-3-phenyl-3-pentenoic acid

Explanation:

Carboxylic acids are a type of functional group in organic chemistry that have the symbol '-COOH'. A suffix used for this functional group is '-oic acid'.

To name a compound, first look for the longest possible carbon chain.

As in the image attached below, the longest carbon chain has 5 carbon atoms. Thus, the prefix used will be 'pent-'

Also, a methyl substituent is present at the 4th position, a phenyl substituent is located at the 3rd position.

A double bond is also present at the 3rd position and a suffix '-ene' is used.

Hence, the IUPAC name for the given compound is 4-methyl-3-phenyl-3-pentenoic acid.

Answer:

sulphuric acid

nitric acid

carbolic acid

The ionic compounds contribute to climate change that is sulphuric acid, nitric acid and carbolic acid.

Ionic compounds were made up of ions kept together by the attraction of positive and negative ions. One of the most well-known ionic compounds is common salt (sodium chloride). Molecular compounds were made up of distinct molecules that also are kept together through electron sharing (covalent bonding).

Long-term variations in temperature but also weather systems are referred to as climate change.

Therefore, the ionic compounds contribute to climate change that is sulphuric acid, nitric acid and carbolic acid.

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Answer:

an element, feature, or factor that is liable to vary or change.

Which reactions are you referring to?

Can you add an image please?

or the reactions you are asking about?

Answer:

FeBr3 is the Lewis acid, and FeBr4-1 is the Lewis base.

Explanation:

A Lewis acid is any specie that has empty orbitals into which it can receive a lone pair of electrons.

A Lewis base is any specie that donates a lone pair of electrons to another to form a dative covalent bond.

If we look at the species listed in the options, FeBr3 is lone pair acceptor hence it is a Lewis acid while FeBr4- is a lone pair donor hence it is Lewis base.

Answer: A volume of 500 mL water is required to prepare 0.1 M [tex]H_{3}PO_{4}[/tex] from 100 ml of 0.5 M solution.

Explanation:

Given: [tex]M_{1}[/tex] = 0.1 M,    [tex]V_{1}[/tex] = ?

[tex]M_{2}[/tex] = 0.5 M,       [tex]V_{2}[/tex] = 100 mL

Formula used to calculate the volume of water is as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]

Substitute the values into above formula as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}\\0.1 M \times V_{1} = 0.5 M \times 100 mL\\V_{1} = 500 mL[/tex]

Thus, we can conclude that a volume of 500 mL water is required to prepare 0.1 M [tex]H_{3}PO_{4}[/tex] from 100 ml of 0.5 M solution.

Answer:

Hydrogen Bonds

Explanation:

Opposite charges attract one another. The slight positive charges on the hydrogen atoms in a water molecule attract the slight negative charges on the oxygen atoms of other water molecules. This tiny force of attraction is called a hydrogen bond.

Answer:

Ethyl ethanoate

Explanation:

To name the compound given above, we must:

1. Determine the functional group of the compound.

2. Determine the longest continuous carbon chain before the functional group and the longest continuous carbon chain after the functional.

3. Name the compound by naming the compound after the functional group followed by the compound before the functional group ending its name with

–oate.

Now, we shall determine the name of the compound as follow:

1. The compound is an ester with the functional group R'COOR.

Note: R' and R are alkyl groups which may be the same or different.

2. The longest continuous carbon chain before the functional group is 2 i.e ethane and the longest continuous carbon chain after the functional group is 2 i.e ethyl

3. The name of the compound after the functional group => ethyl.

The name of the compound before the functional group => ethane but the pressence of the two oxygen atoms makes it ethanoate.

Therefore, the name of the compound is Ethyl ethanoate

Answer:

C₂O₂

Explanation:

Step 1: Given data

Step 2: Calculate the molar mass of the empirical formula

M(CO) = 1 × M(C) + 1 × M(O) = 1 × 12 g/mol + 1 × 16 g/mol = 28 g/mol

Step 3: Calculate "n"

We will use the following expression.

n = molar mass of molecular formula / molar mass of empirical formula

n = (56 g/mol) / (28 g/mol) = 2

The molecular formula is:

CO × n = CO × 2 = C₂O₂

Answer: See image attached!

Good luck with your future exams!

The value of the solubility of product for CaSO₄ in pure water at 0 °C is 1.1881

The solubility of product (Ksp) is defined as the concentration of products raised to their coefficient coefficients. This is illustrated below:

mA <=> nC + eD

Ksp = [C]^n × [D]^e

With the above information in mind, we can obtain the solubility of the product. This is illustrated below:

CaSO₄(aq) → Ca²⁺(aq) + SO₄²⁻(aq)

From the balanced equation above,

1 mole of CaSO₄ contains 1 mole of Ca²⁺ and 1 mole of SO₄²⁻

From the balanced equation above,

1 mole of CaSO₄ contains 1 mole of Ca²⁺ and 1 mole of SO₄²⁻

Therefore,

1.09 g/L of CaSO₄ will also contain

CaSO₄(aq) → Ca²⁺(aq) + SO₄²⁻(aq)

Ksp = [Ca²⁺] × [SO₄²⁻]

Ksp = 1.09 × 1.09

Ksp = 1.1881

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Answer:

mass = moles x molar mass

m= 3.7 x (23x2+16)

m= 3.7x62

m= 229.4g

198.4 grams are there is 3.7 moles of Na₂O.

The number of moles is defined as the ratio between given mass and molar mass.

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\[/tex]

Given:

Number of moles= 3.7 moles

To find:

Mass=?

Molar mass of Na₂O= 62 g/mol

Thus substituting the values in the given formula

[tex]\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}= 3.2 \text{moles}*62 \text{g/mol}\\\\\text{Given mass}=198.4 \text{g}[/tex]

Thus, 198.4 grams are there is 3.7 moles of Na₂O.

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Answer:

n8ce question and answer is time taken

Answer: There are 0.558 liters of the stock solution would she need to have 97.9 grams NaCl.

Explanation:

Given: Molarity = 3.0 M

Mass of NaCl = 97.9 g

Molar mass of NaCl = 58.44 g/mol

As number of moles is the mass of substance divided by its molar mass.

So, moles of NaCl are calculated as follows.

[tex]Moles = \frac{mass}{molar mass}\\= \frac{97.9 g}{58.44 g/mol}\\= 1.675 mol[/tex]

Molarity is the number of moles of a substance present in liter of a solution.

Therefore, volume of given solution is calculated as follows.

[tex]Molarity = \frac{moles}{Volume (in L)}\\3.0 M = \frac{1.675 mol}{Volume}\\Volume = 0.558 L[/tex]

Thus, we can conclude that there are 0.558 liters of the stock solution would she need to have 97.9 grams NaCl.

This Should Be Your Answer:

Step 1: Formation of ions

Step 2: Formation of ionic bonds

Step 3: Formation of cubes

Step 4: Formation of crystals

I Hope This Helps? :)

Answer:

Black Cats?

Explanation:

Answer: The volume of the new solution​ is 83.33 mL.

Explanation:

Given: [tex]V_{1}[/tex] = 200 mL,    [tex]M_{1}[/tex] = 0.5 M

[tex]V_{2}[/tex] = ?,             [tex]M_{2}[/tex] = 1.2 M

Formula used to calculate the volume of new solution is as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]

Substitute the values into above formula as follows.

[tex]M_{1}V_{1} = M_{2}V_{2}\\0.5 M \times 200 mL = 1.2 M \times V_{2}\\V_{2} = 83.33 mL[/tex]

Thus, we can conclude that volume of the new solution​ is 83.33 mL.

Answer: Two compounds below that can be used to make a buffer solution are acetic acid and acetate ion.

Explanation:

A solution that helps in resisting change in pH when a small amount of acid or base is added to it is called a buffer solution.

A buffer solution consists of a mixture of weak acid and its conjugate base.

Acetic acid has a chemical formula [tex]CH_{3}COOH[/tex] and its conjugate base is [tex]CH_{3}COO^{-}[/tex].

This base is also called acetate ion.

Acetic acid is a weak acid because it dissociates weakly when added to a solvent like water.

Therefore, acetic acid and acetate ion will form a buffer solution.

Thus, we can conclude that two compounds below that can be used to make a buffer solution are acetic acid and acetate ion.

Answer:

Social justice aims to give individuals and groups fair treatment and an impartial share of social, environmental and economic benefits. The concept promotes the fair distribution of advantages and disadvantages within a society, regardless of background and status.

Environmental justice deals explicitly with the distribution of environmental benefits and the burdens people experience, at home, at work, or where they learn, play and spend leisure time. Environmental benefits include attractive and extensive greenspace, clean air and water, and investment in pollution abatement and landscape improvements. Environmental burdens include risks and hazards from industrial, transport-generated and municipal pollution.

Answer:

Explanation:

Isomers are compounds with the same molecular formula but chemically distinctive structures. Compounds that vary in connectivity, or how the component atoms are related to one another, are known as constitutional isomers. They have distinct functional groups and bonding patterns according to the sequence in which the atoms are linked together.

From the information given:

The compound given is C₃H₆Br₂ and the constitutional isomer of the compound can be seen in the image attached below.

The formal charges are calculated as follows:

Formal charge = valence electron - 1/2(bonding electron) - lone electron

For Br:

Formal charge = 7 - 1/2(2) - 6

Formal charge = 7 - 1 - 6 = 0

For C:

Formal charge = 4 - 1/2(8) - 0

Formal charge = 4 - 4 = 0

For H:

Formal charge = 1 - 1/2(2)

Formal charge = 1 - 1 = 0

Answer:

Potassium dicyanoargentate(I) | C2AgKN2 - PubChem.

Synonyms: Potassium dicyanoargentate(I)pota...

Molecular Formula: C2AgKN2

Explanation:

Answer:

3.46 g of BaCl2

Explanation:

The equation of the reaction is;

BaCl2(aq) + Na2SO4(aq) --------> 2NaCl(aq) + BaSO4(s)

Number of moles of barium sulphate produced = 3.88 g/233.38 g/mol = 0.0166 moles

From the reaction equation;

1 mole of BaCl2 yields 1 mole of barium sulphate

Hence 0.0166 moles of BaCl2 yields 0.0166 moles of barium sulphate

Hence;

Mass of BaCl2 required = 0.0166 moles × 208.23 g/mol = 3.46 g of BaCl2

Answer:

did not mean to type that sorry i'm pretty sure the answers are c and b.

Explanation:

Answer:

Question 9

Explanation:

An everyday chemical reaction is rusting and iron reacts with oxygen to form rust

Question 8

Chemical reactions do not include fusion and fission only nuclear reactions like radioactivity

Answer:

[tex]P_2=795mmHg[/tex]

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate the final pressure by using the Boyle's law as an inversely proportional relationship in pressure to volume at constant temperature:

[tex]\frac{P_2}{V_2} =\frac{P_1}{V_1}[/tex]

Thus, we solve for our target, P2, to obtain:

[tex]P_2=\frac{P_1V_2}{V_1} =\frac{770mmHg*603mL}{584mL}\\\\P_2=795mmHg[/tex]

Regards!

Answer: The final concentration of aluminum cation is 0.335 M.

Explanation:

Given: [tex]V_{1}[/tex] = 47.8 mL (1 mL = 0.001 L) = 0.0478 L

[tex]M_{1}[/tex] = 0.321 M,       [tex]V_{2}[/tex] = 21.8 mL = 0.0218 L,      [tex]M_{2}[/tex] = 0.366 M

As concentration of a substance is the moles of solute divided by volume of solution.

Hence, concentration of aluminum cation is calculated as follows.

[tex][Al^{3+}] = \frac{M_{1}V_{1} + M_{2}V_{2}}{V_{1} + V_{2}}[/tex]

Substitute the values into above formula as follows.

[tex][Al^{3+}] = \frac{M_{1}V_{1} + M_{2}V_{2}}{V_{1} + V_{2}}\\= \frac{0.321 M \times 0.0478 L + 0.366 M \times 0.0218 L}{0.0478 L + 0.0218 L}\\= \frac{0.0153438 + 0.0079788}{0.0696}\\= 0.335 M[/tex]

Thus, we can conclude that the final concentration of aluminum cation is 0.335 M.