what is the concentration of an NaOH solution that requires 50 mL of a 1.25 M H2SO4 solution to neutralize 78.0 ml of NaOH​

Answer:

An Arrhenius Base

Explanation:

The definition of this is a base that is a hydroxide ion donor.

A base is a substance that produces hydroxide ions in solutions.

A base that produces hydroxide ions in aqueous solution is also known as:  A. Arrhenius bases

An Arrhenius base is a compound that increases the OH− ion concentration in aqueous solution. The reaction between an Arrhenius acid and an Arrhenius base is called neutralization and results in the formation of water and a salt.

An Arrhenius base is a substrate that increases the concentration of hydroxide ions in the aqueous solution. The example for Arrhenius base is highly soluble sodium hydroxide compound in water, which dissociates to give sodium ion and hydroxide ion.

Other examples of Arrhenius acids include sulfuric acid (H2SO4), hydrobromic acid (HBr), and nitric acid (HNO3). Examples of Arrhenius bases include sodium hydroxide (NaOH) and potassium hydroxide (KOH).

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Answer:

A.

Explanation:

if it's the same element the protons will always be the same, but have different neutrons, and neutrons is made up of protons and atomic mass, which atomic mass numbers can be calculated different where in return gives different numbers of neutrons.

EX: say the element is carbon, carbon has 6 protons and that won't change, but carbon can have an atomic mass of 12, 13, or 14, etc. so when you make up the neutrons you add protons and atomic mass, 6 + 12 = 18 N

6 + 13 = 19 N

6 + 14 = 20 N

Isotopes of a given element have the same number of protons but vary in the number of neutrons. Therefore, option A: protons; neutrons is correct.

If two atoms are isotopes of the same element, they will have the same number of protons, but will have different numbers of neutrons. This is because all isotopes of an element will contain the same number of protons, which determines the atomic number and thus the identity of the element. However, isotopes differ in the number of neutrons in their atomic nuclei, which leads to differing atomic masses. Hence, the correct choice is A: protons; neutrons.

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Answer:

d) non-renewable resources

Explanation:

A natural resource such as coal, gas, or oil that, once consumed, cannot be replaced. Most energy resources currently in use are non-renewable while the renewable ones (such as wind and solar power) are not well developed. Also called depletable resource.

Answer: Non renewable resources.

Explanation: The non renewable resources can be defined as the resources that once used cannot be replenished. The resources like oil and copper takes very long time to form and this makes it non-renewable.

The natural resources like oil takes a long time to form inside the ocean and its extraction is also done after long time because its formation takes time.

Answer:

Sulfonic acid

Explanation:

I think this is correct

The name of the chemical formula [tex]S_4O_6[/tex] is tetrathionate.

The tetrathionate anion is sulfur that is produced by tetrathionic acid.

The ion has two sulfur atoms in oxidation state 0 and two sulfur atoms in oxidation state +5.

The structure of tetrathionate can be seen by following three corners of a cube.

Thus, Tetrathionate is the name of [tex]S_4O_6[/tex].

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Answer:  

--Acid is the substance when dissolved in water, increases the concentration of H+ ions.

--Such compound whose chemical formula begins with H, for example HCl (Hydrochloric acid), H3BO3 (Boric acid), CH2O3 (Carbonic

acid). Although CH3COOH (Acetic acid) is an exception.

--Its less than 7.

--Bases are the proton acceptor.

--Such compounds whose chemical formula ends with OH, for example KOH (Potassium hydroxide), NaOH (Sodium hydroxide).

--Its greater than 7.

Explanation:

One can distinguish between a strong acid and a strong base by using pH paper or a pH meter, observing the reaction in a neutralization process with known substances, and testing the conductivity of the solutions.

To distinguish between a strong acid and a strong base, one can use the following three safe methods:

It's important to handle all strong acids and bases with proper safety equipment and procedures due to their corrosive nature.

the element first discovered in the sun is the element Helium. This noble gas is the second most abundant element in the universe and was discovered on the sun before it was discovered on the earth.

hope this helps :)

Answer:

[tex]\boxed{\text{The atomic number increases}}[/tex]

Explanation:

That's because each time you move one atom to the right, you add a proton to the nucleus, and the atomic number is the number of protons in the nucleus.

Answer:

Volume of the gas under STP is 84.7 mL.

Assumption: the gas is ideal.

Explanation:

How many moles of particles in this gas?

Convert all units to SI units before applying the ideal gas law.

The ideal gas constant: [tex]R \approx \rm 8.314\;Pa\cdot m^{3}\cdot K^{-1}\cdot mol^{-1}[/tex].

The ideal gas law:

[tex]P \cdot V = n \cdot R\cdot T[/tex]

Rearrange the ideal gas law to find the number of moles of particles [tex]n[/tex] in this gas:

[tex]\displaystyle n = \frac{P\cdot V}{R\cdot T} = \frac{5.39\times 10^{4}\times 1.80\times 10^{-4}}{8.314\times 308.65} = \rm 3.78081\times 10^{-3}\;mol[/tex].

The volume of one mole of an ideal gas under STP is 22.4 liters. The volume of [tex]\rm 3.78081\times 10^{-3}\;mol[/tex] of gas will be:

[tex]\rm 3.78081\times 10^{-3}\;mol\times 22.4\;L\cdot mol^{-1} = 0.0846901\;L = 84.7\; mL[/tex].

All three values in the question come with three significant figures. Keep more significant figures than that in calculations and round the final answer to three significant figures. Hence the answer: 84.7 mL.

Answer:

I believe two correct statements are;

The vapor pressure is produced by water molecules that have evaporated.

The vapor pressure increases as the Sun heats the water in the pot.

Explanation:

When an uncovered pot of water lies out in the sun then the vapor pressure is produced by water molecules that have evaporated and increases as the Sun heats.

Vapor pressure is a property of the substance which may change into gaseous state.

When an uncovered pot of water lies out in the sun, then the vapor pressure is produced by the water molecules of the surface phase and they get evaporated. And due to heat transfer by the sun in the form of sunlight vapor pressure of water also increases, which results into more evaporation.

Hence, option (2) and (3) is correct it means vapor pressure increases as the sun heats the water in the pot and they get evaporated.

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Answer:

D

Explanation:

Tough question. Both Cl2 and H2 are gases. Everything depends on what the water is. If it's a liquid, then D is the answer. If it's a gas, then you have to be a little more careful.

2H2O = 2 * 18 = 36.

Cl2 = 2*Cl = 2 * 35.5

Cl2 = 71

So D is still the answer.

Answer: weigh the same as the products.

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.

[tex]2NaCl+2H_2O\rightarrow 2NaOH+Cl_2+H_2[/tex]

Given:

Mass of products = Mass of sodium hydroxide + mass of chlorine + mass of hydrogen = 2(40)+1(71)+2(1)= 153 g

Mass of reactants = Mass of sodium chloride + mass of water = 2(58.5)++2(18)= 153 g

Thus the total mass of reactants is equal to the total mass of products.

Answer:

4.5 L.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R  is the general gas constant,

T is the temperature of the gas in K.

(P₁V₁) = (P₂V₂)

P₁ = 3.0 atm, V₁ = 1.5 L,

P₂ = 1.0 atm, V₂ = ??? L.

(P₁V₁) = (P₂V₂)

∴ V₂ = (P₁V₁)/P₂ = (1.5 L)(3.0 atm)/(1.0 atm) = 4.5 L.

So, the right choice is: 4.5 L.

Answer:

4.5 L.

Explanation:

Answer: Thermal Energy

Explanation:

Answer:

Hot water has kinetic energy

Explanation:

That is an energy that involves movement. Kinetic energy water causes flows and make waves exist

Answer:

Nuclear Fusion

Explanation:

This creates heat and protons that can heat up the sun

The core is composed of hot, dense plasma. The process nuclear fusion is responsible for the intense heat and pressure in the sun's core.

The process in which two lighter nuclei fuse together to form a heavier nucleus with the simultaneous release of a huge amount of energy is defined as the nuclear fusion.

Some mass is always lost during this process and this is converted into energy in accordance with Einstein's equation, E = mc². This huge amount of energy is released.

The fusion reactions are common in the interior of stars. The energy of our sun is believed to arise from a number of complex fusion steps. The net reaction is:

4 (₁¹H) → ₂⁴He + 2 (₊₁⁰e) + energy

During nuclear fusion in the core photons and neutrinos are released. These particles carry and emit the light, heat and energy of the sun.

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At the melting point. Draw a line up from 0 degrees and a line to the right from 1 atm. They meet at the line between solid and liquid... the melting point

Answer: it's boiling point!

Explanation:

Answer:

266.2 g.

Explanation:

M = (no. of moles of KCl)/(Volume of the solution (L))

M = 2.47 M.

no. of moles of KCl = ??? mol,

Volume of the solution = 1445.71 mL = 1.44571 L.

∴ (2.47 M) = (no. of moles of KCl)/(1.44571 L)

∴ (no. of moles of KCl) = (2.47 M)*(1.44571 L) = 3.571 mol.

no. of moles of KCl = mass/molar mass

∴ mass of KCl = (no. of moles of KCl)*(molar mass) = (3.571 mol)*(74.55 g/mol) = 266.2 g.

Answer:

[tex]\boxed{\text{9.170 m}}[/tex]

Explanation:

The pressure p exerted by a column of liquid is given by the formula  

p = hρg

where

h = height of column

ρ = density of liquid

g = acceleration due to gravity

Data:

p = 1 bar = 100 kPa = 10⁵ N·m⁻² = 10⁵ kg·m⁻¹s⁻²

ρ = 1.112 g·cm⁻³ = 1112 kg·m⁻³

g = 9.807 m·s⁻²

Calculation:

10⁵ = h × 1112 × 9.807

10⁵ = 1.091 × 10⁴ h

h = 9.170 m

[tex]\text{The height of a column of ethylene glycol that would be supported by an}\\\\\text{atmospheric pressure of 1 bar is }\boxed{\textbf{9.170 m}}[/tex]

Final answer:

To find the grams of phosphorus in 500.0 grams of calcium phosphide, the molar mass of calcium phosphide is calculated, followed by the number of moles in the sample. The mole ratio then gives the moles of phosphorus, which is finally converted to grams, resulting in approximately 169.35 grams of phosphorus.

Explanation:

To determine the number of grams of phosphorus in 500.0 grams of calcium phosphide, we need to follow these steps:

Therefore, there are approximately 169.35 grams of phosphorus in 500.0 grams of calcium phosphide.

The answer is ionic

Answer: Option (a) is the correct answer.

Explanation:

A bond where transfer of electrons take place from one atom to another is known as an ionic bond.

An ionic solution is defined as a solution in which an ionic compound is dissociated into ions.

For example, NaCl is an ionic compound and when it is dissolved in water it dissociates as [tex]Na^{+}[/tex] and [tex]Cl^{-}[/tex] ions.

As it is known that electric current is the flow of charges. Hence, a solution that contains ions will be a good conductor of electricity.

Whereas in general, a covalent solution does not contain any ions.

Thus, we can conclude that ionic solutions are good conductors of electricity.

Explanation:

FALSE

ITS NOT ALWAYS NECESSARY TO BE IN AN ORDER

Answer:

The second and third option are isotopes of Bromine

Z=  35 A = 79

A = 79  N= 44

Explanation:

Step 1: What are isotopes ?

⇒ Elements  with same atomic number (Z) ( this means the same number of electrons and protons) but a different number of neutrons (N)

The atomic number (visible on the periodic table) is the number of protons.

The atomic mass is  the sum of the protons (Z) and neutrons (N), and is showed as 'A'. So A = Z+N

If we look at the periodic table, we can see that the atomic number of bromine (Z) = 35. This means the amount of protons = 35. Since isotopes have the same amount of protons, all isotopes of bromine, have 35 protons.

1) Z = 79, A = 196

Z = protons = electrons .So this element has 79 protons, as well as 79 electrons.

196 = 79 + N ⇒ N = 196 - 79 = 117 neutrons

⇒Since it doesn't have 35 protons, it isn't an isotope of Bromine, but of Gold (Au): 196Au

2) Z = 35 , A = 79

Z = protons = electrons .So this element has 35 protons, as well as 35 electrons.

79 =35 + N ⇒ N = 79 - 35= 44 neutrons

⇒Since it does have 35 protons, it is an isotope of Bromine. This isotope has 44 neutrons

⇒ This is 79Br, which is a stable isotope of Bromine.

3) A=79, N = 44

Z = A - N ⇒ Z = 79 - 44 = 35

Z = protons = electrons .So this element has 35 protons, as well as 35 electrons. It also has 44 neutrons.

⇒Since it does have 35 protons, it is an isotope of Bromine, with 44 neutrons: 79Br

4) Z = 44, N = 44

Z = protons = electrons .So this element has 44 protons, as well as 44 electrons.

A = 44 + 44 ⇒ A = 88  

⇒Since it doesn't have 35 protons, it isn't an isotope of Bromine, but of Ruthenium (Ru) : 88Ru

⇔So the second and third option are isotopes of Bromine

Answer:

D. Glycolysis

Explanation:

In glycolysis, energy is required to break a molecule of glucose into two pyruvate molecules. These two pyruvate molecules are used during pyruvate oxidation; which is stage II of cellular respiration.

During glycolysis, two molecules of ATP are used and four molecules of ATP are produced. So there is a net gain of two ATP molecules. Hydrolysis of a glucose molecule produces high energy electrons which are used to reduce two NAD+ molecules to NADH.

These two molecules are used in the citric acid cycle to produce more ATP molecules.

The stage of cellular respiration that ends with two ATP molecules and two NADH molecules is Glycolysis. Therefore, option D is correct.

Glycolysis is the first stage of cellular respiration, occurring in the cytoplasm of the cell. It involves the breakdown of glucose into two molecules of pyruvate.

During glycolysis, a net gain of two ATP molecules and two NADH molecules is produced.

The ATP molecules generated in glycolysis are formed through substrate-level phosphorylation, where a phosphate group is transferred directly from a high-energy molecule to ADP, forming ATP.

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Answer:

Alpha has the greatest mass- A.

Answer: The correct answer is Option A.

Explanation:

For the given options:

Alpha decay is defined as the process in which alpha particle is emitted. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a mass of 4 units.

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

Beta decay is defined as the process in which beta particle is emitted. In this process, a neutron gets converted to a proton and an electron. The beta particle does not have any mass.

[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+_{-1}^0\beta[/tex]

Gamma decay is defined as the process in which an unstable nuclei gives off excess energy by a spontaneous electromagnetic process and thus releases [tex]\gamma -radiations[/tex]. These radiations does not have any mass.

[tex]_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma[/tex]

Nuclear reactions are defined as the reactions in which change of nucleus takes place.

Hence, the correct answer is Option A.

Answer:

108.9 L.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(P₁V₁) = (P₂V₂).

P₁ = 125 mm Hg, V₁ = 136.5 mL,

P₂ = 156.7 mm Hg, ​V₂ = ??? mL.

∴ V₂ = (P₁V₁)/(P₂) = (125 mm Hg)(136.5 mL)/(156.7 mm Hg) = 108.9 L.

Answer:

0.16 rounded

Explanation:

I used a calculator to get this answer, one that compared grams and mol.

The mass of 0.000142 mole of vitamin C is approximately 0.025 grams. This is derived by multiplying the number of moles by the molar mass of vitamin C, which is 176.124 g/mol.

The mass in grams of 0.000142 mole of vitamin C can be calculated by using the formula:

Mass (grams) = number of moles x molar mass (g/mol)

Calculating the Mass of Vitamin C

We have 0.000142 mole of vitamin C, and the molar mass of vitamin C (ascorbic acid) is 176.124 g/mol. By multiplying these values, we get:

Mass = 0.000142 moles x  176.124 g/mol = 0.025010168 grams

Therefore, the mass of the recommended daily dietary allowance of vitamin C for children aged 4-8 years is approximately 0.025 grams.

Answer:

[tex]\boxed{\text{25 da}}[/tex]

Explanation:

Step 1. Convert pounds to milligrams

(a) Pounds to grams

[tex]\text{Mass} = \text{2 lb} \times \dfrac{\text{454 g}}{\text{1 lb}} = \text{910 g}[/tex]

(b) Grams to milligrams

[tex]\text{Mass} = \text{910 g} \times \dfrac{\text{1000 mg}}{\text{1 g}} = \text{910 000 mg}[/tex]

Step 2. Calculate the time

(a) Milligrams to minutes

[tex]t = \text{910 000 mg}} \times \dfrac{\text{20 min}}{\text{500 mg}} = \text{36 000 min}[/tex]

(b) Minutes to hours

[tex]t = \text{36 000 min} \times \dfrac{\text{1 h}}{\text{60 min}} = \text{610 h}[/tex]

(c) Hours to days

[tex]t = \text{ 610 h} \times \dfrac{\text{1 da}}{\text{24 h}} = \text{25 da}[/tex]

It will take [tex]\boxed{\textbf{25 da}}[/tex]to dissolve the iron oxide.

Answer : The time taken for the reaction is 36363.64 minutes.

Explanation :

First we have to convert the mass of iron oxide from milligram to pounds (lbs).

[tex]1\text{ lbs}=453592mg[/tex]

or,

[tex]1mg=\frac{1}{453592}\text{ lbs}[/tex]

As, [tex]1mg=\frac{1}{453592}\text{ lbs}[/tex]

So, [tex]500mg=\frac{500mg}{1mg}\times \frac{1}{453592}\text{ lbs}=0.0011\text{ lbs}[/tex]

Now we have to calculate the time taken for the reaction.

As, [tex]0.0011\text{ lbs}[/tex] of iron oxide take time = 20 minutes

As, [tex]2\text{ lbs}[/tex] of iron oxide take time = [tex]\frac{2\text{ lbs}}{0.0011\text{ lbs}}\times 20\text{ minutes}=36363.64\text{ minutes}[/tex]

Therefore, the time taken for the reaction is 36363.64 minutes.

Answer:

i would say deposition

Answer:

The answer to this question is heptane.

Explanation:

The name of the molecule will be 6-ethyl octan-2-ene.

6-ethyl octan-2-ene is kind of organic molecule in which 8 carbon atom is exit. At C-6 carbon ethyl group is attached.

A molecule would be a collection of two and more components bound atoms, whether they are from an identical element or another.

It can be seen that the longest chain of the molecule is C-8 and at C-2 carbon atom double bond is present . So it can be named as octan-2-ene . Due to the attachment of ethyl group with C-6 carbon atom it will be name as 6-ethyl octan-2-ene

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Answer:

The molar mass of copper (II) nitrate is 187.5 g/mol.

Explanation:

The molar mass is the mass of all the atoms in a molecule in grams per mole. To calculate the molar mass of a molecule, we first obtain the atomic weights from the individual elements in a periodic table. We then count the number of atoms and multiply it by the individual atomic masses.

Ca3(PO4)2 is the answer.

Answer : The formula for the compound is [tex]Ca_3(PO_4)_2[/tex]

Explanation :

For formation of a neutral ionic compound, the charges on cation and anion must be balanced.

The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non-metals.

In the given question, the calcium metal forms an ionic compound with polyatomic anion (phosphate) [tex]PO_4^{3-}[/tex].

Here, calcium is having an oxidation state of +2 called as [tex]Ca^{2+}[/tex] cation and phosphate [tex]PO_4^{3-}[/tex] is an anion with oxidation state of -3. The charges are not balanced. So, the charges are balanced by the cris-cross method. Thus, the compound formed will be, [tex]Ca_3(PO_4)_2[/tex]

Hence, the formula for the compound is [tex]Ca_3(PO_4)_2[/tex]