Plss help me pass . I am so confused in chemistry !!

Answer:

B. They Increase the [OH-]

Explanation:

Have a great day! :)

Taking into account the definition of the Arrhenius theory of acids and bases, the correct answer is option B. "Bases increase the concentration of hydroxide ions [OH⁻]"

An Arrhenius acid is defined as chemical substances that contain hydrogen, and that when dissolved in water produce a concentration of hydrogen ions or protons (H⁺), increasing the concentration of H⁺ in the solution.

That is, according to Arrhenius theory, an acid is a substance that dissociates H⁺ ions in aqueous solution.

On the other hand, according to this Theory, a Arrhenius base is any substance that, when dissolved, releases hydroxyl ions (OH⁻).

So, the correct answer is option B. "Bases increase the concentration of hydroxide ions [OH⁻]"

Learn more about Arrhenius Theory:

brainly.com/question/15444181

brainly.com/question/15387513

brainly.com/question/16032044

#SPJ9

There are numerous ways to determine whether lead is present in an ore. Atomic absorption spectroscopy is a popular approach. With this method, an ore sample is dissolved in acid and then atomized in a flame or plasma.

The sample's atoms will absorb light at particular wavelengths that are peculiar to the element under investigation. The amount of light absorbed can be used to calculate how much lead is present in the sample. Inductively coupled plasma mass spectrometry and X-ray fluorescence spectroscopy are further techniques. It is crucial to remember that these procedures call for specialized tools and training, thus they ought to only be carried out in a lab by qualified experts.

To know more about spectrometry, here

brainly.com/question/31075363

#SPJ1

The mass of HF produced from the given amounts of BF₃ and H₂ is 99.5 grams.

To solve this problem, we need to use stoichiometry to determine the amount of HF produced from the given amounts of BF₃ and H₂.

From the balanced equation;

2 BF₃ + 3 H₂ → 2 B + 6 HF

We can see that 2 moles of BF₃ react with 3 moles of H₂ to produce 6 moles of HF. This means that the ratio of BF₃ to HF is 2:6, or 1:3.

First, we need to calculate the number of moles of BF₃ and H₂ from their given masses and molar masses;

n(BF₃) = m(BF₃) / M(BF₃) = 40 g / 67.81 g/mol = 0.59 mol

n(H₂) = m(H₂) / M(H₂) = 5 g / 2.02 g/mol = 2.48 mol

Next, we can determine which reactant is limiting by comparing their mole ratios. The ratio of BF₃ to H₂ is 1:1.67, which means there is not enough H₂ to react with all of the BF₃. This makes H₂ the limiting reactant.

To find the number of moles of HF produced, we use the mole ratio from the balanced equation;

n(HF) = n(H₂) × (6 mol HF / 3 mol H₂) = 2.48 mol × 2

= 4.96 mol

Finally, we calculate the mass of HF produced from its number of moles and molar mass;

m(HF) = n(HF) × M(HF) = 4.96 mol × 20.01 g/mol

= 99.5 g

Therefore, the mass of HF is 99.5 grams.

To know more about mass here

https://brainly.com/question/18064917

#SPJ1

Taking into account definition of percent yield, the percent yield of the reaction if 3.35 g of N₂H₄ reacts with excess oxygen and produces 0.350 L of N₂ is 13.82%.

In first place, the balanced reaction is:

N₂H₄ + O₂ → N₂ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

where:

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield= (actual yield÷ theoretical yield)× 100%

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

In this case, you know:

Replacing in the ideal gas law:

1 atm×0.350 L = n×0.082 \(\frac{atmL}{molK}\)× 295 K

Solving:

n= (1 atm×0.350 L) ÷ (0.082 \(\frac{atmL}{molK}\)× 295 K)

n= 0.01447 moles

Finally, the actual yield of N₂ is 0.01447 moles.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 32 grams of N₂H₄ form 1 mole of N₂, 3.35 grams of N₂H₄ form how many moles of N₂?

moles of N₂= (3.35 grams of N₂H₄× 1 moles of N₂)÷ 32 grams of N₂H₄

moles of N₂= 0.1047 moles

Finally, the theoretical yield of N₂ is 0.1047 moles.

In this case, you know:

Replacing in the definition of percent yield:

percent yield= (actual yield÷ theoretical yield)× 100%

Solving:

percent yield= (0.01447 moles÷ 0.1047 moles)× 100%

percent yield= 13.82%

Finally, the percent yield for the reaction is 13.82%.

Learn more about reaction stoichiometry and percent yield:

brainly.com/question/14110366

brainly.com/question/12970739

brainly.com/question/24741074

brainly.com/question/14253477

brainly.com/question/14408642

#SPJ1

The factor that  doesn’t change the resistance of a wire is pressure. option A.

Resistance is a conductor's capacity to thwart the passage of current. It is controlled by the interplay of the applied voltage and the electric current passing through it. The amount of opposition any object applies to the flow of electric current is referred to as resistance.

The ohm, a unit of measurement for resistance, is represented by the Greek letter omega. According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them.

Hence option A is correct.

Learn more about resistance at

https://brainly.com/question/17563681

#SPJ1

missing part;

The pressure

The length of the resistor.

The thickness of the resistor.

The temperature of the conductor.

To solve this we must be knowing each and every concept related to environment. Therefore, the correct option is option B among all the given options.

An environment may be simply defined as a system that includes all abiotic and biotic components that have an impact on human life. All flora and animals are considered biotic, or living, elements, whereas water, sunshine, air, temperature, etc. are considered abiotic.

Any good, service, or feature that benefits people and society might be considered one of an environment's resources. They might be anything that fulfills a person's requirements on a daily basis. Amount of oxygen in the water is a biotic factor of an aquarium environment.

Therefore, the correct option is option B.

To know more about environment, here:

https://brainly.com/question/28962722

#SPJ1

Answer: B: Water Temperature

Explanation: k12 test 1.04 Science Life semester 2

There are 3.44 x 10^{22} particles in 0.057 moles of lithium bromide.

The lithium bromide formula also known as the lithium monobromide formula or Bromo lithium formula is explored. It is a counterion bromide-based salt of lithium.

we have to use Avogadro's constant,

Avogadro's constant, is approximately equal to 6.022 x 10^{22} particles per mole.

we can use the following formula:

number of particles = moles x Avogadro's constant

Substitute the values,

number of particles = 0.057 moles x 6.022 x 10^{23} particles/mol

Simplifying the equation

number of particles = 3.44 x 10^{22} particles

To know more about lithium bromide visit:

https://brainly.com/question/16584013

#SPJ9

Answer: A

Explanation:

As one increases the other goes in a straight line.  It is called a direct proportionality.  Forms a linear graph.

All the element have their own unique color because the every element have their own set of energy levels.

According to the bohr model of atoms : electrons exist at certain energy levels. when we give heat to electron , it gets excited and moves from lower energy level to higher energy level. the electron is less stable in higher energy level. when an electron returns from higher energy level to lower energy level it emits some energy in form of radiation. The wavelength of light depends upon energy level . and every elements have their own unique energy levels.  The color for different element is different.

Thus, All the element have their own unique color because the every element have their own set of energy levels.

To learn more about element colors here

https://brainly.com/question/5809727

#SPJ1

Answer:

butane

Explanation:

I hope this helps!

Answer:

Butane

...............

The equilibrium concentration of H₃O⁺ in a 0.20 M solution of oxalic acid is equal to 0.11 moldm⁻³.

Let [\(HA_{c}\) ] represent oxalic acid and [\(A_{c} ^{-}\) ] represent oxalate ion,

Then,

\(K_{a}\) = [H₃O⁺] × [\(A_{c} ^{-}\)] /  [\(HA_{c}\)]  

So during the first dissociation,

5.9 × 10⁻² =  [H₃O⁺] × [\(A_{c} ^{-}\)] / 0.2

So,

0.118 = [H₃O⁺]²

As,  [H₃O⁺] ion as well as the respective anion must be existing in a 1:1 ratio in solution, therefore,

0.1086 = [H₃O⁺]  = [\(A_{c} ^{-}\)]

In the second dissociation,

6.4 × 10⁻⁵ = [H₃O⁺] × [\(B_{c} ^{-}\)] / 0.1086

[H₃O⁺] = 0.002637

Adding the concentration from the first and the second dissociation,

0.002637 + 0.1086 = 0.11 moldm⁻³

The equilibrium concentration of H₃O⁺ is 0.11 moldm⁻³.

To know more about equilibrium concentration here

https://brainly.com/question/16645766

#SPJ4

Answer:

C

Explanation:

Because they 2 or more atoms

Steel wool and Oxygen (Fire)

Steel wool is mostly iron (Fe) and oxygen cannot be seen but it is used during heating or burning of substances. When iron is burned, it reacts with oxygen in the air to form iron oxide (FeO2). This reaction releases heat. When the steel wool is heated, a new substance is created. The mass of steel wool (product) is increased. This is a chemical change/reaction because the steel wool changes to iron oxide, and mass is not conserved.

Egg and heat

An egg is a liquid substance which consists of colorless substance and yellow yolk. Heat is not seen but produced by the heat source. When the egg is heated, it becomes a solid. The mass of the egg is not changed, it remains the same, the only difference is that it changes from being a liquid to solid. Only a physical change occurred.

Water and heat

Water (I will assume it is in its liquid state) is liquid and heat is the source of energy, it cannot be seen but is implied by the heat source which can be a stove in this case. When liquid water is heated, its state is changed to vapor or gas. The mass of the water remains the same, thus mass is conserved because this is a physical reaction or change.

Zinc and hydrogen Chloride

Zinc is a brittle metal at room temperature and has a silver-greyish appearance. Hydrogen Chloride is a colourless gas at room temperature. When zinc reacts with hydrochloric acid (hydrogen chloride), the metal displaces the hydrogen to form zinc chloride. This is a chemical reaction since zinc increases in mass, thus mass is not conserved.

Sodium hydroxide and Copper sulfate

Sodium hydroxide is a white solid and copper sulfate is a blue solid. When sodium hydroxide reacts with copper sulfate a blue precipitate of copper hydroxide is formed. This is a chemical reaction, thus the mass of one of the reactants will be larger in products. However, mass is conserved if all products are observed/calculated.

Some tips to follow when doing lab practical are:

From the table, Column 1 represents the time in half-life cycles, ranging from the initial state to 8 cycles. Column 2 shows the predicted number of radioactive atoms at each time point, based on the assumption that the number of atoms reduces by half in each half-life cycle.

Column 3 represents the simulated number of radioactive atoms at each time point and corresponds to the predicted values of the simulation.

In conclusion, the results as outlined in the lab guide are A=  27 B=  16 C=  9 D=  4 E=  2 F=  2 G=  0 H= 0.

Learn more about half-life cycles at:

https://brainly.com/question/15976750

#SPJ1

#complete question:

Do step 3 as outlined in the lab guide. Record your results in the appropriate blanks. A = B = C = D = E = F = G = H = A 3-column table with 9 rows. Column 1 is labeled Time half-life cycles, n with entries Initial, 1, 2, 3, 4, 5, 6, 7, 8. Column 2 is labeled Predicted radioactive atoms with entries 100, 50, 25, 13, 6, 3, 2, 1, 0. Column 3 is labeled Simulated radioactive atoms with entries 100, A, B, C, D, E, F, G, H.

Explanation:

the answer is circle 3 hope it helps

The mass of chlorine gas product formed is 61.4 g.

What is the mass ?

First, we need to determine which reactant is limiting and which is in excess. To do this, we can use the given mass of HCl and convert it to moles:

63.2 g HCl × (1 mol HCl/36.46 g HCl) = 1.73 mol HCl

Next, we can use stoichiometry to determine how many moles of \(Cl_{2}\) will be produced from 1.73 mol of HCl:

1.73 mol HCl × (2 mol \(Cl_{2}\)/4 mol HCl) = 0.865 mol \(Cl_{2}\)

Finally, we can convert the moles of \(Cl_{2}\) to grams using its molar mass:

0.865 mol \(Cl_{2}\) × (70.91 g \(Cl_{2}\)/1 mol \(Cl_{2}\)) = 61.4 g \(Cl_{2}\)

Therefore, the mass of chlorine gas product formed is 61.4 g.

What is stoichiometry ?

Stoichiometry is a branch of chemistry that deals with the calculation of the quantities of reactants and products involved in a chemical reaction. It involves using balanced chemical equations to calculate the amounts of reactants required to produce a certain amount of product, or the amount of product that can be obtained from a given amount of reactant. Stoichiometry is an important tool for predicting the outcomes of chemical reactions and for designing chemical processes in industry.

To know more about stoichiometry, visit:

https://brainly.com/question/30215297

#SPJ1

The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

For more such questions on entropy visit:

https://brainly.com/question/30481619

#SPJ8

Answer:

i wish i could help but people are around me

Explanation:

The number of moles of N2 produced at equilibrium is (3/2)x = 0.048 mol, which is the same as the number of moles of N2O remaining.

The given reaction is: 2N2O(g) + N2H4(g) → 3N2(g) + 2H2O(g)

The balanced stoichiometry of the reaction shows that for every 2 moles of N2O reacted, 3 moles of N2 are produced. Therefore, we can determine the number of moles of N2 produced by calculating the number of moles of N2O reacted.

At the start of the reaction, there were 0.10 moles of N2O and 0.25 moles of N2H4 present in the 10.0-L container. Assuming that the volume of the container remains constant, we can use the given information to calculate the initial partial pressures of the reactants:

Partial pressure of N2O = (0.10 mol / 10.0 L) x (0.0821 L.atm/mol.K) x 298 K = 0.00243 atm

Partial pressure of N2H4 = (0.25 mol / 10.0 L) x (0.0821

L.atm/mol.K) x 298 K = 0.00608 atm

Let x be the number of moles of N2O reacted at equilibrium. Therefore, the number of moles of N2 produced is (3/2)x. At equilibrium, the partial pressures of all the gases in the container are equal. Using the ideal gas law, we can express the partial pressures of N2O and N2H4 in terms of x:

Partial pressure of N2O = [(0.10 - x) mol / 10.0 L] x (0.0821 L.atm/mol.K) x 298 K

Partial pressure of N2H4 = [(0.25 - x/2) mol / 10.0 L] x (0.0821 L.atm/mol.K) x 298 K

The partial pressures of N2 and H2O can be expressed in terms of x using the stoichiometry of the reaction:

Partial pressure of N2 = [(3/2)x mol / 10.0 L] x (0.0821 L.atm/mol.K) x 298

Partial pressure of H2O = [(2/2)x mol / 10.0 L] x (0.0821 L.atm/mol.K) x 298 K

At equilibrium, the sum of the partial pressures of all the gases in the container is equal to the total pressure, which is assumed to be constant at 1 atm:

[(0.10 - x) + (0.25 - x/2) + (3/2)x + x] x (0.0821 L.atm/mol.K) x 298 K = 1 atm

Simplifying the equation and solving for x gives:

x = 0.032 mol

Therefore, the number of moles of N2 produced at equilibrium is (3/2)x = 0.048 mol, which is the same as the number of moles of N2O remaining.

For more such questions on moles

https://brainly.com/question/29367909

#SPJ11

Answer:131.6 g

Explanation:

131.6 grams of carbon dioxide would be produced from the complete reaction of 83.7 g carbon monoxide.

The balanced chemical equation is given below.

Fe2O3 + 3CO → 2Fe + 3CO2

Calculation,

Since, 28g of carbon dioxide produces 44g of carbon monoxide.

So, 83.7 g of carbon dioxide produces 44×83.7/28 grams

83.7 g of carbon dioxide produces 131.6 grams

The symbolic representation of chemical reaction in which reactant represents in left side and product represents in right side is called chemical equation.

To learn more about chemical equation here.

https://brainly.com/question/21049751

#SPJ3

Answer:

5 significant figures.

Explanation:

The decimal place makes the zeros significant.

Answer:

0.45 g

Explanation:

Step 1: Given data

Step 2: Calculate the moles of methionine (n)

We will use the following expression.

n = C × V

n = 150 × 10⁻³ mol/L × 20 × 10⁻³ L

n = 3.0 × 10⁻³ mol

Step 3: Calculate the mass of methionine (m)

We will use the following expression.

m = n × M

m = 3.0 × 10⁻³ mol × 149.21 g/mol

m = 0.45 g

Chlorine is the most commonly used chemical sanitizer agent and there are so many factors that influences the effectiveness of these chemical sanitizers like- Temperature, Concentration, Contact time, Water Hardness, pH but bacterial cell history does not affect the efficiency of sanitizers.

Factors influencing the effectiveness of chemical sanitizer:

To know more about Sanitizers:

brainly.com/question/9635668

#SPJ4

To answer this question, we need to convert grams to moles and then use the Avogadro's number to convert moles to molecules.

The molar mass of Mg(OH)2 is 58.32 g/mol.

First, we need to find the number of moles of Mg(OH)2 in 75.0 g.

75.0 g / 58.32 g/mol = 1.287 mol

Next, we need to convert moles to molecules.

1.287 mol x 6.022 x 10^23 molecules/mol = 7.75 x 10^23 molecules

Finally, we can use the molecular formula of Mg(OH)2 to calculate the number of miles of Mg(OH)2.

1 molecule of Mg(OH)2 contains 3 atoms of oxygen (O) and 2 atoms of hydrogen (H).

So, the total number of miles of Mg(OH)2 is:

7.75 x 10^23 molecules x 2 miles/molecule = 1.55 x 10^24 miles

Therefore, there are 1.55 x 10^24 miles of magnesium hydroxide in 75.0 g of magnesium hydroxide.

Quantatative is when a number of something changes, and we could sometimes visualize it, but qualitative is different.

Hope this helps

kenny

:D

Answer:

The common thing is the compound water

Explanation:

in condensation h2O is expelled while in hydrolysis water is used or added

Answer:

Option B, the phenyl group is an electron withdrawing group by induction, which stabilizes the anion formed in the reaction

Explanation:

Cyclohexanol  is less acidic than the phenol and has a stable alkoxide ion. Phenol group is attached to the oxygen atom and due to a double bond and presence of negative inductive effect, phenols act as an electron withdrawing group. The anion is stabilized by induction  

Hence, option B is correct

Answer:

True

Explanation:

All metals do rust but at different rates. Gold, platinum, and silver can rust if but at different rates. It can take time for it to rust, if you clean your metals, it won't rust, it'll take awhile before it rusts if you keep cleaning them.

Hopefully this helps :3 sorry if wrong :( plz mark brainiest if correct :D your bootiful/handsome! Have a great day luv <3

-Bee~

Answer:

I can not see the file

Explanation:

We can not use a salt bridge saturated with potassium chloride solution in an electro-chemical cell made from a Ag/Ag+ cathode and a Cu/Cu²+ anode because it will precipitate.

An electrochemical cell that uses a weak electrolyte and a salt bridge to connect oxidation as well as reduction half cells. A junction that joins the anodic with cathodic compartments of a cell and electrolytic solution is referred to as a salt bridge.

Because both chloride and potassium ions have very similar diffusion coefficients and minimise junction potential, the inactive minerals potassium chloride (KCl) frequently used. We can not use a salt bridge saturated with potassium chloride solution in an electro-chemical cell made from a Ag/Ag+ cathode and a Cu/Cu²+ anode because it will precipitate.

To know more about salt bridge, here:

https://brainly.com/question/2861410

#SPJ1