It takes 40 mL of 0.10 M of hydrochloric acid (HCl) to neutralize 50 mL of sodium hydroxide (NaOH) for the following chemical reaction

HCl + NaOH → NaCl + H2O

The concentration of sodium hydroxide is _____.
0.125 M
0.08 M
0.10 M
0.04 M

Answer:

:)

Explanation:

Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.

Answer:

H2O

Explanation:

Thats the formula :P

Answer: atomic mass

Explanation: Mass is equal to one twelfth the mass of an atom of carbon-12

Answer:

Atomic number

Explanation:

Because atomic number is unique for each element and never changes

Answer:

formula units

Explanation:

\($KClO_3$\)  is  potassium chlorate. It is an ionic compound containing potassium, chlorine and oxygen. The ion in potassium chlorate are held together by the ionic bonds in the lattice structure.

A representative particle may be defined as the smallest unit for which the substance exists in its natural form. For most of the elements, atom is the representative particle. Molecule is the representative particle for diatoms and molecular compounds. But for ionic compounds such as  \($KClO_3$\) , NaCl, etc. . the representative particle is its formula units.

This mistake would lead to inaccurate results because the unknown acid wasn't completely transferred into the flask. As a result, the recorded results won’t reflect the true acid concentration of the unknown acid.

In order to obtain accurate results, all of the unknown acid must be completely transferred into the flask before titrating with a NaOH solution that was correctly standardized.

When this step is not taken, the amount of acid titrated will not be an accurate representation of the unknown acid's concentration. This leads to a lower than expected titration result, which in turn leads to inaccurate results.

It is important to remember to transfer all of the unknown acid into the flask before titrating with a standardized NaOH solution. Doing so ensures that the titration results will accurately reflect the concentration of the unknown acid.

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Answer:

57

Explanation:

a mass number is protons plus neutrons so we add them

30+27

57

Hopes this helps please mark brainliest

Answer:

57

Explanation:

the other guy is right

The nuclear equation of the beta decay of 39/17 Cl is as follows:

39/17 Cl → 39/18 Cl + 0/-1 e

A nuclear reaction is a process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

The reaction products may contain a different element or a different isotope of the same element due to this change.

A beta decay is a nuclear reaction in which a beta particle (electron or positron) is emitted. A beta particle is an energetic electron or positron produced as the result of a nuclear reaction or nuclear decay. A beta decay occurs as depicted below;

A/Z X → A/(Z + 1) X‘ + e

Where;

Therefore, if a 39/17 Cl undergoes beta decay, the nuclear reaction can be given as follows:

39/17 Cl → 39/18 Cl + 0/-1 e

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Answer:

23

This particular isotope of potassium-42 contains 42 nucleons (i.e., protons and neutrons, combined;) Like other isotopes of potassium 19 out of these nucleons are protons; the rest 42−19=23 are therefore neutrons.

Answer:

23 neutrons

Explanation:

Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

The time can be represented as follows:

t= 2.303\∧ log A0/A

∧= 0.693/t 1/2

The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.

The given parameters are as follows:

t1/2=12.3

A0=5.5

A=0.688

t= 2.303/(0.693/12.3) log (5.5/0.688)

t=36.9

t=37 years

Thus, wine was produced 37 years ago (1984 as usual year 15,2021)

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a) Melting: An example of melting that occurs in our everyday life is when we heat butter on a stovetop.

b) Freezing: Freezing is the process in which a liquid transforms into a solid upon cooling.

c) Condensation: One example of condensation that we encounter regularly is when water droplets form on the surface of a cold drink on a hot day.

d) Evaporation: Evaporation is the process by which a liquid transforms into a gas or vapor.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state.

a) Melting:  Butter is a solid at room temperature, but when heat is applied, it melts into a liquid. This change is a result of the increase in temperature, which provides enough energy to overcome the intermolecular forces holding the butter molecules together.

b) Freezing:Eventually, the temperature reaches the freezing point of water (0°C or 32°F), at which the water molecules slow down and arrange themselves into a regular, crystalline structure. This transformation from a liquid to a solid state is accompanied by the release of heat energy.

c) Condensation: As the temperature decreases, the air's capacity to hold moisture decreases, causing the water vapor in the air to condense into liquid water droplets. This process occurs due to the transfer of heat energy from the warm air to the cold surface, leading to the saturation of the air and the conversion of water vapor into liquid form.

d) Evaporation:  As the sun's heat energy is absorbed by the water molecules on the clothes' surface, their kinetic energy increases, causing them to break free from the liquid phase and escape into the surrounding air as water vapor. This process occurs because the molecules at the liquid surface with sufficient energy can overcome the attractive forces within the liquid and enter the gas phase.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state. An example of sublimation is the process of dry ice (solid carbon dioxide) converting into carbon dioxide gas.

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Answer:

2.60 M

Explanation:

M1V1=M2V2

Where

M1 = ?

V1 = 20.9 mL

M2 = 2.548 M

V2 = 21.39 mL

(?)(20.9 mL) = (2.548 M)(21.39 mL)

------------------   -----------------------------    

(20.9 mL)                 (20.9 mL)

? = (54.50)/(20.9) = 2.60 M

(Side Note: the mL cancel each other out to leave M units only)

Answer:

D

Explanation:

I am sorry if wrong

Answer:

C

Explanation:

I tested the other answer and it was wrong, when I put C I got 100... Your welcome!

Answer: Environmental bias can be defined as the idea that suggests a group of people being living in the environment which is harmful for them.

Explanation:

There are three categories that make up the environmental bias there are socio-cultural choice, occupational choice, and personal choice.

The environmental bias can be related to chemistry as chemical lab is an area prone to chemical (acid, alkali) and fire so produced in reactions thus prone to accidental hazards not safe for working of people. But people like to work in chemical lab due to their personal and occupational choice.

Answer:  d. Cyolite

Explanation:

a.bauxite   - Aluminum ore ✅

b.haematite - Iron ore  ✅

c.calamine - an ore of zinc  ✅

d.cyolite​ -   ❌  the ore is cryolite

✅ - is an ore

❌ - not an ore

In an acid-base titration, a known concentration of a base is added to an unknown concentration of an acid until the equivalence point is reached.

The equivalence point is when the moles of acid and base are equal and the solution becomes neutral. To find the molarity of the acid in this problem, we can use the following equation: Macid x Vacid = Mbase x Vbase, where Macid is the molarity of the acid, Vacid is the volume of the acid used in the titration (25.0 mL), Mbase is the molarity of the base used in the titration (0.100 M), and Vbase is the volume of the base used to reach the equivalence point (30.2 mL). Substituting the given values into the equation, we get: Macid x 25.0 mL = 0.100 M x 30.2 mL. Macid = (0.100 M x 30.2 mL) / 25.0 mL. Macid = 0.1208 M. Therefore, the molarity of the acid is 0.1208 M.

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The molar concentration is 1.56 x 10^-5 M.

To determine the molar concentration of hydrogen ions (H+) in a 0.05 M HCN solution, we need to consider the acid dissociation constant (Ka) of HCN. HCN is a weak acid that partially dissociates in water according to the following equation:

HCN ⇌ H+ + CN-

The Ka of HCN is 4.9 x 10^-10. Using the Ka expression, we can set up an equation to solve for the concentration of H+:

Ka = [H+][CN-] / [HCN]

Since the dissociation is small, we can assume that [H+] = [CN-] and that the change in [HCN] is negligible. Therefore, the equation becomes:

4.9 x 10^-10 = [H+]^2 / 0.05

Solving for [H+], we find that the molar concentration of hydrogen ions in the 0.05 M HCN solution is approximately 1.56 x 10^-5 M.

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gas with the smallest amount of molecular weight will effuse the quickest

L-DOPA was used to treat Encephalitis Lethargica, as depicted in the novel and film "Awakenings" in the 1970s.Option (b)

L-DOPA (levodopa) was indeed used to treat the patients suffering from Encephalitis Lethargica, commonly known as "sleepy sickness." This disease was characterized by symptoms such as excessive sleepiness, reduced movement, and sometimes a prolonged motionless state.

The novel and subsequent film "Awakenings" by Oliver Sacks depicted the use of L-DOPA in the 1970s to awaken and temporarily improve the condition of patients who had been in a catatonic state for decades due to Encephalitis Lethargica.

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Knowing that the percent yield of this reaction was 72.0%, then 0.3681 moles I₂ was reacted with excess H₂.

Percent yield is defined as the ratio of the actual yield to the theoretical yield multiplied by 100.

Percent yield = (actual yield / theoretical yield) x 100

If a quantity of I₂ was reacted with excess H₂ to give 0.530 moles of HI, and the percent yield of this reaction was 72.0%, then the theoretical yield of the reaction should be 0.7361 moles of HI.

Percent yield = (actual yield / theoretical yield) x 100

72 = (0.530 / theoretical yield) x 100

theoretical yield = 0.7361 moles

Then, write a balanced equation for the reaction of I₂ and H₂ to produce HI.

I₂ + H₂ ⇒ 2 HI

From the balanced equation, 1 mole of I₂ requires 1 mole of H₂ to produce 2 moles of HI.

Theoretically, there should be 0.7361 moles of HI.

Let x = moles of I₂

1 mole of I₂ : 2 moles of HI = x mole of I₂ : 0.7361 moles of HI

x = 0.3681 moles I₂

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Answer:

0.77046

Explanation:

Answer:

Carbon

Explanation:

I just finished this and that's what I got from my periodic table.

Answer:

First Blank: 656.3 kJ

Second Blank: Endothermic

Explanation:

Edge 21'

Answer:

1.  656.3

2.  endothermic

Explanation:

Answer:

Grass

Explanation:

The higher up you go in a food chain, the less energy available and the more you have to use to acquire energy.

The reaction of H2 and N2 to produce NH3 is a synthesis reaction represented by the equation:N2 + 3H2 → 2NH3The given equation indicates that 1.11 g of H2 reacts with 9.99 g of N2 to produce 1.66 g of NH3.However, we can find the limiting reagent to determine which reactant limits the production of NH3.

H2 is a lighter reactant with a molar mass of 2.02 g/mol, and N2 is a heavier reactant with a molar mass of 28 g/mol.To find the limiting reagent, we need to calculate the number of moles of each reactant by using the formula:moles = mass / molar massMoles of H2 = 1.11 g / 2.02 g/mol = 0.55 molesMoles of N2 = 9.99 g / 28 g/mol = 0.36 molesFrom the calculation, we can see that N2 is the limiting reagent because it produces fewer moles than H2 to produce NH3.The amount of NH3 produced can also be calculated using the balanced equation and the number of moles of N2 as the limiting reagent.0.36 mol N2 x (2 mol NH3 / 1 mol N2) x (17.03 g NH3 / 1 mol NH3) = 12.28 g NH3However,

the actual amount produced is given as 1.66 g, which is less than the theoretical yield of 12.28 g. Therefore, the percentage yield of NH3 is calculated as follows:Percentage yield = actual yield / theoretical yield x 100%Percentage yield = (1.66 g / 12.28 g) x 100% = 13.53%Therefore, the percentage yield of NH3 in this reaction is 13.53%.The unreacted excess reagent is calculated as follows:Excess reagent = initial moles - moles usedMoles used = 0.36 moles of N2 used in the reactionExcess reagent of H2 = 0.55 moles - (0.36 moles x 3) = 0.55 - 1.08 = -0.53 molesSince we cannot have negative moles, the excess reagent of H2 is zero, meaning that all the H2 is used up in the reaction.

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Answer:

Gases have more kinetic energy than liquids

Explanation:

Gases have more kinetic energy than liquids. Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces.

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The organic solvent was not used directly to extract caffeine from tea because caffeine will sublimate if extracted directly with methylene chloride or ethyl acetate from tea; option C.

Solvents are substances in which other substances are dissolved.

Solvents are of two types;

Based on the principle of like dissolves like, organic solvents are used to dissolve organic materials. For example, caffeine will be more soluble in organic solvents than in inorganic solvents.

On the other hand, inorganic solvents are used to dissolve inorganic materials. For example, water will dissolve inorganic salts better.

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For getting an indication whether a chemical reaction or chemical change has taken place, if  B)Heat is given off then chemical reactions occur. So,correct option is B.

Chemical reactions are surrounding us, from the digestion of food in our body to how the light we get from the sun is the consequence of compound responses. Prior to starting with compound responses, realizing about physical and synthetic changes is significant

Option A can't be the response is dissolving is an actual change. No substance response occurred.

Option B is the response as it is an EXOTHERMIC reaction so intensity will be emitted.

Option C can't be the response as dissolving is essentially ions becoming particles, not a synthetic response by which a reactant responds with one more reactant to shape an item.

Option D can't be the response. Same explanation with respect to why An isn't the response.

Hence, correct option is B.

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(Complete question) is:

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? A) Solid melts. B) Heat is given off. C) Substance dissolves D) Substance changes shape.