What happens when a base dissolves?
A. It increases the concentration of OH in solution.
B. It increases the concentration of H+ in solution.
C. It adds oxygen to the solution.
D. It is no longer dangerous.

Answer:

A.

Explanation:

because a theory is like a prediction and a prediction is like a hypothesis.

Answer:

7.35 - 7.45

Explanation:

The pH scale ranges from 0 (strongly acidic) to 14 (strongly basic or alkaline). A pH of 7.0, in the middle of this scale, is neutral. Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45. Usually, the body maintains the pH of blood close to 7.40.

Hope this helps

Answer:

The normal pH range if a base is more than 7

Explanation:

Basideally the pH range goes from 0-14 in which

Acidic range is :0-7

Neutral :7

Base : 7 - 14

Answer:an element in a chemical equation is called a subscript.

Explanation:

it represents the the number of atoms of that element present in the compound. hope this helps have a great day yall

The number at the bottom right of an element in a chemical equation is called a subscript.

Subscripts represent the number of atoms of that particular element in a molecule or formula unit. They indicate the ratio of atoms or ions present in a compound. Subscripts are written in a smaller font size and appear slightly below the element's symbol.

For example:

In the chemical compound water [tex](H_2O)[/tex],the subscript '2' indicates that there are two atoms of hydrogen (H) bonded to one atom of oxygen (O). The subscript specifies the ratio of elements in the compound, indicating that there are two hydrogen atoms for every one oxygen atom in water.

Therefore, the term subscript refers to the number on the right of an element in a chemical equation.

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According to stoichiometry and mole concept,1×10¹⁰ molecules reacted with excess hydrogen to make 2 x 10¹⁰ molecules of ammonia.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important while balancing chemical equations.

In the given example, as 1 molecule of nitrogen produces 2 molecules of ammonia

∴2 x 10¹⁰ molecules of ammonia will be produced when 2 x 10¹⁰×1/2=1×10¹⁰ molecules .

Thus, 1×10¹⁰ molecules reacted with excess hydrogen to make 2 x 10¹⁰ molecules of ammonia.

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Answer:

sorry i dont know

Explanation:

Answer:

A true universal solvent does not exist. Although water is considered to be a the "universal solvent" it only dissolves other polar molecules. It does not dissolve nonpolar molecules, including organic compounds such as fats and oils. It is only called so because it can dissolve many more than other liquids.

Answer:

It is going to be binary

Explanation:

Answer:

3 AU

Explanation:

The distance from the Earth to the Sun is known as 1 AU, or 1 Astronomical Unit. If an asteroid is three times this distance, it is 3 AU away.

Answer:

CH₂

Explanation:

From the question given above, the following data were obtained:

Mass of Carbon (C) = 5.41 g

Mass of compound = 6.32 g

Empirical formula =?

Next, we shall determine the mass of Hydrogen (H) in the compound. This can be obtained as follow:

Mass of Carbon (C) = 5.41 g

Mass of compound = 6.32 g

Mass of Hydrogen (H) =?

Mass of H = mass of compound – mass of C

Mass of H = 6.32 – 5.41

Mass of H = 0.91 g

Finally, we shall determine the empirical formula of the compound. This can be obtained as follow:

Mass of C = 5.41 g

Mass of H = 0.91 g

Divide by their molar mass

C = 5.41 / 12 = 0.451

H = 0.91 / 1 = 0.91

Divide by the smallest

C = 0.451 / 0.451 = 1

H = 0.91 / 0.451 = 2

Thus, the empirical formula for the compound is CH₂

Answer:

(C) SO2.

SO2 is known as sulfur dioxide.

The below information about acid rain and SO2’s involvement is from epa.gov:

“Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents. The SO2 and NOX react with water, oxygen and other chemicals to form sulfuric and nitric acids. These then mix with water and other materials before falling to the ground.”

Explanation:

Answer:

a) The mean repeat unit molar mass for PEVA is 30.72 g/mol

b) degree of polymerization of the copolymer is 1300

Explanation:

Given that;

the wt% of copolymer consist of 12.9 wt% of vinyl acetate and 87.1 wt% Ethylene.

Basis: 100 g of PEVA consist of 12.9 of vinyl acetate and 87.1g of Ethylene.

now we calculate the mole fraction of vinyl acetate Ethylene in the copolymer;

the molecular weights of vinyl acetate and ethylene are 86.09 g/mol and 28.05 g/mol respectively

so

moles of vinyl acetate = wt. of vinyl acetate / molecular weights of vinyl acetate

moles of vinyl acetate = 12.9 g / 86.09 g/mol

moles of vinyl acetate = 0.1498 mol

moles of Ethylene = wt. of Ethylene / molecular weights of Ethylene

moles of Ethylene = 87.1 g / 28.05  d/mol

moles of Ethylene  = 3.1052 mol

Total moles = 0.1498 mol + 3.1052 mol = 3.255 mol

Next we calculate the mole percent;

mole percent of vinyl acetate [tex]X_{V}[/tex] = moles of vinyl acetate / total  moles

[tex]X_{V}[/tex] = (0.1498 mol / 3.255 mol) × 100

[tex]X_{V}[/tex]  = 4.6%

mole percent of Ethylene [tex]X_{E}[/tex] = moles of Ethylene / total  moles

[tex]X_{E}[/tex]  = (3.1052 mol / 3.255 mol) × 100

[tex]X_{E}[/tex]  = 95.397% ≈ 95.4%

we know that, mean repeat unit molar mass for a sample = ∑[tex]X_{i}[/tex][tex]M_{i}[/tex]

where [tex]X_{i}[/tex] is the fraction ratio and [tex]M_{i}[/tex] is the molecular  weight

so or the PEVA

mean repeat unit molar mass M = ( [tex]X_{V}[/tex][tex]M_{V}[/tex]) + ( [tex]X_{E}[/tex][tex]M_{E}[/tex])

so we substitute

M = ( 4.6% × 86.09) + ( 95.4% × 28.05 )

M = 3.96014 + 26.7597

M = 30.72 g/mol

Therefore, The mean repeat unit molar mass for PEVA is 30.72 g/mol

b)

Degree of polymerization

[tex]DP_{n}[/tex] = [tex]\frac{M_{n} }{M}[/tex]

where [tex]M_{n}[/tex] is the number average molecular weight ( 39,870 g/mol )

so we substitute

[tex]DP_{n}[/tex] = 39,870 g/mol / 30.72 g/mol

[tex]DP_{n}[/tex]  = 1297.85 ≈ 1300   { 3 significance figure }

Therefore, degree of polymerization of the copolymer is 1300

Answer:

D. Keq: [SO3][NO] /[SO2]NO2]

Explanation:

Hello!

In this case, according to the process to set up equilibrium expressions for chemical reactions at equilibrium, we realize we need to write up the concentration of products on top and that of reactants on bottom; thus, for there chemical reaction herein specified, we obtain:

[tex]Keq=\frac{[SO_3][NO]}{[SO_2][NO_2]}[/tex]

Thereby, the answer is D. Keq: [SO3][NO] /[SO2]NO2].

Best regards!

Answer:

D

Explanation:

Answer:

3.31 g/cm³

Explanation:

1000cm³ = 1L

4.87mL = 4.87 × 10^-3 × 1000 = 4.87 cm³

density = mass/volume = 16.12/4.87 = 3.31 g/cm³

Answer:

A)  $0.208 per unit

B) $0.220 per unit

C) An inspector should be hired

Explanation:

percentage of defect rate = 2% = 0.02

cost of inspector = $10 per hour

production rate = 48 per hour

cost of not hiring an inspector = $11

A) Determine the inspection cost per unit if an inspector is hired

= cost of inspector / production rate

= 10 / 48 = $0.208 per unit

B) Determine the defective cost per unit if an Inspector is not hired

= cost of not hiring an inspector * percentage of defect rate

= 11 * 0.02

= $0.220 per unit

C)   Inspection cost < defective cost   i.e. $0.208 < $0.220  hence an inspector should be hired

Answer:

B

Explanation:

All elements on both sides of the equation have the same amount of moles

Answer: Molecular formula of copper (II) bromide is [tex]CuBr_2[/tex]

Molecular formula of aluminium (III) nitrate is [tex]Al(NO_3)_3[/tex]

Molecular formula of calcium (II) phosphate is [tex]Ca_3(PO_4)_2[/tex]

Molecular formula of iron (III) sulphide is [tex]Fe_2S_3[/tex]

Molecular formula of mercury (II) chloride is [tex]HgCl_2[/tex]

Molecular formula of magnesium (II) acetate is [tex](CH_3COO)_2Mg[/tex]

Explanation:

The name of the ionic compounds is written by writing the name of the cation first followed by its oxidation state in round brackets and then the name of the anion is written without any suffix. Thus the cation is written first followed by the oxidation state and then the anion.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced.  Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral compound.

Molecular formula of copper (II) bromide is [tex]CuBr_2[/tex]

Molecular formula of aluminium (III) nitrate is [tex]Al(NO_3)_3[/tex]

Molecular formula of calcium (II) phosphate is [tex]Ca_3(PO_4)_2[/tex]

Molecular formula of iron (III) sulphide is [tex]Fe_2S_3[/tex]

Molecular formula of mercury (II) chloride is [tex]HgCl_2[/tex]

Molecular formula of magnesium (II) acetate is [tex](CH_3COO)_2Mg[/tex]

Answer:

Human chorionic gonadotropin (HCG) injections are much safer to use with some mild side effects to treat issues of testicular atrophy. Human chorionic gonadotropin (HCG) injections would increase blood flow and enable the testes' produce testosterone, reduce the shrinkage of the testicles and it also aids in the production of sperm cells which has been initially impaired due to testicular atrophy.

Explanation:

Anabolic steroid is a drug that plays the role of testosterone.

Testicular atrophy is the shrinkage of the testicles caused by old age or infections. Once it occurs, it lowers the production of testosterone and sperm cells.

Trenbolone increases muscle building, aids lean fat deposition, reduces the production of testosterone, and could also lead to testicular atrophy.

Answer:

Carbon (C)

Explanation:

The electron configuration of Carbon is 2-4.

Answer:

it is false

Explanation:

it goes in different ways not in order

Answer:

Common names of ethers simply give the names of the two alkyl groups bonded to oxygen and add the word ether. The current practice is to list the alkyl groups in alphabetical order (t-butyl methyl ether), but older names often list the alkyl groups in increasing order of size (methyl t-butyl ether).

Explanation:

Hope it is helpful.......

Answer:

Explanation:

Newtons 1st law:

If you slide a hockey puck on ice, eventually it will stop, because of friction on the ice. It might also stop if a hockey player places their stick in front of it.

Newton's 2nd law:

If the mass of an object is 20 kg and it's acceleration is 5 m/s, the force acting upon it is (m*a or 20*5) 100 N.

Another example that proves that force is dependent upon mass is that if you were to move a car and a truck (that were both previously stationary) at the same speed, the car would take less force/effort to move than the truck.

Newton's 3rd law:

If a book on a table, the table is exerting a force on it that is equal and opposite to the force of gravity.

If two soccer balls of the same mass collide, one moving and one stationary, then they would both apply an equal and opposite force onto each other, causing the moving ball to stop and the previously stationary ball to move at the speed of  the previously moving ball.

Answer:

6.591

explanation

mass of weight is 1.092 , and mass of weight boat and sample = 7.683

mass of the solid sample= (mass of weight boat and sample) - (weight of the boat) = (1.092-7683) = 6.591 g

hence, the mass of the solid sample is 6.591 g

Answer:Because When you're cleaning your glassware, you use water to rinse it off. If the burette is not completely dry by the time you use it, the remaining traces of water on the inside will make your titrant more dilute and thereby change its concentration.Before a burette is used, it needs to be cleaned. During the cleaning process, usually, water is introduced into the burette. Be the water clean or not, if the burette is then used without rinsing it with the solution that it is going to be filled with, the result of that analytical exercise will not be precise and accurate. The reason is that water residue in the burette would dillute the solution when it's filled in the burette which would make it impossible to determine the exact concentration of the solution moved by the burette. By rinsing and re-rinsing the burette several times with the solution it is going to be filled with, residue water from the cleaning process would be successfully removed from the burette as are other leftover substances from the cleaning process.

hope this helps have a nice night ❤️❤️❤️

Explanation:

Answer:uhhhhh should I be concerned

Explanation:

Answer:

hmmm o_O Maybe you... shouldnt

Answer:

methane on the other hand is made of one carbon atom and 4 hydrogen atoms. like water, the bonds are covalent.

Liquid methane and Liquid water are both covalent compounds, thus, they both have covalent bonds in common.

Methane is a covalent compound which exists as a gas at room temperature.

Methane is composed of four hydrogen atoms and a carbon atom linked together by covalent bonds.

Water is a covalent compound which exists as a liquid at room temperature.

Water is composed of two atoms of hydrogen and one atom of oxygen linked together by covalent bonds.

Since both liquid water and liquid methane are covalent compounds, they both have covalent bonds in common.

Therefore, liquid methane and liquid water have covalent bonds in common.

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Answer:

(a). (I). 0.816; 0.816

(ii). 0.917.

(b). When the value for the critical extent of reaction is 0.866, then the number of moles of glycerol and the number of moles of di-carboxylic acid is the same. But, in this case the number of moles of glycerol is not the same with the number of moles of di-carboxylic acid.

Explanation:

So, without mincing words let's get straight into the solution to the question above.

(a). Using the (i) statistical theory of Flory to Determine the critical extent of reaction gelation, one has to make use of the two equations given below;

P(1) = [ v + vb ( n - 2)^-1/2 ------------------(1).

P(2) = v^1/2 [ 1 + b ( n - 2)^-1/2 ----------(2).

The value for v = 1.2 + 1.2/ 1.2 × 2 = 1.

The value of b = (1.2 + 1.2)/ 1.2 = 0.5.

Thus, putting the values into the equation (1) and (2) above gives;

NB: n = 3.

P(1) = [ 1 + 1 × 0.5 ( 3 - 2)^-1/2 = 0.816.

P(2) = 1^1/2 [ 1 + 0.5 ( 3 - 2)^-1/2 = 0.816.

Using the (ii) carother's theory to Determine the critical extent of reaction gelation.

We have the following values for glycerol: k = 0.4, n = 3.

For ethylene glycol; k = 0.6, n = 2.

Therefore, the critical extent of reaction gelation =2/[ (0.6 × 2) + (0.4 × 3) + (1.2 × 2)/ (0.6 + 0.4 + 1.2)] = 2/ 2.18 = 0.917

(b). When the value for the critical extent of reaction is 0.866, then the number of moles of glycerol and the number of moles of di-carboxylic acid is the same. But, in this case the number of moles of glycerol is not the same with the number of moles of di-carboxylic acid.

Answer:

4.4 g

Explanation:

Step 1: Write the balanced equation

Cu + 4 HNO₃ ⇒ Cu(NO₃)₂ + 2 NO₂ + 2 H₂O

Step 2: Calculate the moles corresponding to 3.2 L of NO₂ at STP

At standard temperature and pressure, 1 mole of NO₂ occupies 22.4 L.

3.2 L × 1 mol/22.4 L = 0.14 mol

Step 3: Calculate the moles of Cu needed to produce 0.14 moles of NO₂

The molar ratio of Cu to NO₂ is 1:2. The moles of Cu needed are 1/2 × 0.14 mol = 0.070 mol.

Step 4: Calculate the mass corresponding to 0.070 moles of Cu

The molar mass of Cu is 63.55 g/mol.

0.070 mol × 63.55 g/mol = 4.4 g

Answer:

[tex]\lambda=10^{12}\ m[/tex]

Explanation:

Given that,

The frequency of the light, [tex]f=3\times 10^{-4}\ Hz[/tex]

We need to find the wavelength of the light.

The relation between frequency, wavelength and the speed of light is given by :

[tex]c=f\lambda\\\\\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3\times 10^{-4}}\\\\\lambda=10^{12}\ m[/tex]

So, the wavelength of the light is [tex]10^{12}\ m[/tex].

The wavelength of light will be "[tex]10^{12} \ m[/tex]"

Given:

By using the relation,

→ [tex]\lambda = \frac{c}{f}[/tex]

By putting the values, we get

→    [tex]= \frac{3\times 10^8}{3\times 10^{-4}}[/tex]

→    [tex]= 10^{12} \ m[/tex]

Thus the above response is right.

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Answer:

B.

Explanation:

Not sure if this is correct if not sorry.