The amount of K O H needed, in grams, in reaction 1 if you want to have 10% excess K O H

Answers

Answer 1

The mass of KOH reacted is 2.576 g. To have a 10% excess KOH, i need 2.833 g of KOH.

The equation of the reaction is;

2 Al(s) + 2 KOH(aq) + 6H20 (l) --------> 2K+ (aq) + 2 Al(OH)4^- (aq) + 3H2(g)

We are told that 1.25 g of Al was used in the reaction, hence;

Number of moles of Al = 1.25 g/27 g/mol = 0.046 moles

To obtain the amount of KOH required for the reaction;

2 moles of Al reacts with 2 moles of KOH

0.046 moles of Al also reacts with 0.046 moles of KOH

Mass of KOH reacted = 0.046 moles of KOH × 56 g/mol = 2.576 g

To have a 10% excess KOH;

Let the needed mass of KOH be x

x =2.576 g + (0.1 × 2.576 g)

x = 2.833 g

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Assuming you start with 1.25 g of pure aluminum, calculate the following:

1) The amount of potassium hydroxide, KOH, in grams, needed to react with all of the 1.25 g of Al. The reaction is: 2 Al(s) + 2 KOH(aq) + 6H20 (1) --->  2K+ (aq) + 2 Al(OH)4^- (aq) + 3H2(g)  2) The amount of KOH needed, in grams, in reaction 1 if you want to have 10% excess KOH.

Related Questions

Some changes in matter may results to 1. _ or 2._ effects in the environment. We have to do our share in maintaining 3. environment. We must 4. too much use of electricity and gasoline. We must also avoid 5. rubber tires and plastics. We must avoid practices that will produce acid rain, increase global temperature, or deplete the ozone layer.​ pls i need answers

Answers

Answer:

C

Explanation:

PLEASE MARK AS BRAINLIEST!!!!!

Complete the paragraph below. Do it using your Science journal or notebook


SUSPENSION IS A KIND OF MIXTURE____________________________
_________________AS IT________________________________AT THE BOTTOM WHEN LEFT UNDISTURBED​

Answers

Answer:

SUSPENSION IS A KIND OF MIXTURE where particlea are visible to the naked eyes AS IT settled AT THE BOTTOM WHEN LEFT UNDISTURBED.

how do you expect the size of the atoms to change as you go from neon to argon to krypton

Answers

Answer:

The number of energy levels will increase.

Explanation:

As they are all Noble Gases, they are all in the same family. However, as you go further down the list of Noble Gases, the period number increases. The period number shows the number of energy levels. Hence, an increase in energy levels.

The size of the atoms (atomic radius) would increase down the group from neon to argon to krypton.

What is atomic radius?

Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element, typically from the nucleus to its valence electrons.

The trends of atomic radius.

Generally, the atomic radius of a chemical element decreases across the periodic table, from alkali metals (group 1 elements) to noble gases (group 8 elements). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).

In this context, the size of the atoms (atomic radius) would increase down the group from neon to argon to krypton.

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What structure
do plant cells have during
cytokinesis that animal cells
do not have?

Answers

Answer: See Explanation

Explanation:

Cytokinesis occurs in mitosis and meiosis for both plant and animal cells. The ultimate objective is to divide the parent cell into daughter cells.

In plants , this occurs when a cell wall forms in between the daughter cells.

In animals , this occurs when a cleavage furrow forms. This pinches the cell in half.

answer 3 questions. screenshot

Answers

Cells typically receive signals in chemical form via various signaling molecules. When a signaling molecule joins with an appropriate receptor on a cell surface, this binding triggers a chain of events that not only carries the signal to the cell interior, but amplifies it as well.

What evidence supports the theory of continental drift? Select three.

Question 10 options:

Fossils of plants and animals


Distinctive rock layers and mountain ranges


Glacial scratches on rocks


Volcanic activity along the Ring of Fire

Answers

Answer:

fossils of plants and animals

distinctive rock layers and mountain ranges

Glacial scratches on rocks

Explanation: I took the quiz lol

Why are mass of atoms called relative masses?​

Answers

The atomic mass constant (symbol: mu) is defined as being 112 of the mass of a carbon-12 atom. Since both quantities in the ratio are masses, the resulting value is dimensionless; hence the value is said to be relative.

Answer question based on the periodic table entry for bromine.
How many protons does bromine have?

a. 35
b. 36
c. 45
d. 80

Answers

A is your correct answer. Bromine has 35 protons.

Atomic Theory questions. Will be worth 50 points.

Answers

Answer:

1. Option C

2. Option D

3. Option B

4. Option

5. Option

6. Option

7. Option

1. C
2. D
3. B
4. A
5. B
6. A
7. B
8. D
9. D
10. A
11. A
12. C
13. B

(i think uhhh)

what is the percent by mass of chlorine in potassium chloride

Answers

Answer:  Originally Answered: A sample of 0.892g of potassium chloride is dissolved in 54.6g of a water. What is the percent by mass of the potassium chloride in this solution?

Well, take the quotient…

0.892∙g0.892∙g+54.60∙g×100%  percentage by mass potassium chloride

≈2%

Explanation:

Why was the morning session stopped unsuccessfully?

The reactor was overheating.
The automatic control system was not adjusted properly.
The vernier control rod became stuck.
The emergency rod failed.

Answers

Answer:

the reactor was overheating

Why has the acidity of the ocean increased over the years?

A.Sediment deposits cannot replenish quick enough in order to affect the acidity

B.Not enough basic solutions in the ocean

C. Waste from ocean life

Answers

Answer:

I think it's A

Explanation:

Carbon dioxide is added to the atmosphere whenever people burn fossil fuels. ... As the amount of carbon dioxide in the atmosphere rises, the oceans absorb a lot of it. In the ocean, carbon dioxide reacts with seawater to form carbonic acid. This causes the acidity of seawater to increase.

For which salt is the aqueous solubility most likely to change by changing the pH of the solution?
a) CaF2(aq)
b) CaCl2(aq)
c) CaI2(aq)
d) CaBr2(aq)

Answers

The salt whose aqueous solubility will most likely to change the pH of the solution is CaF2(aq).

The pH of a salt solution depends on the nature of the acid and base that forms the salt.

Salt of a weak acid and a strong base yields a basic solutionSalt of a strong acid and a weak base yields an acidic solutionSalt of a strong acid and a strong base yields a neutral solution.

Since HF is a weak acid, its salt CaF2 will be slightly basic when dissolved in water hence the pH of the solution is altered.

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what if two objects have the same mass but different sizes which is denser? expain

Answers

Answer:

Imagine you have 5 marbles in your hand and 5 marbles spread in front of you on the floor. Each group has the same mass, but one is contained in a smaller space. The marbles in your hand would be denser because there is more "stuff" in a smaller space.

Explanation:

this one too please lol

Answers

Answer:

It looks like 43 to me, so 43 ml?

Explanation:

I'd say that's 43ml

Hope this helps- have a good day bro cya)

How many ML of 0.44 M HCl are needed to dissolve 9.83 g of BaCO3

Answers

Answer:

nBACO3=m/M=9,83/197=0,05(mol)  ->nHCl=0,05.2/1=0,1(mol) =>VHCl=n/CM=0,1/0,44=0,227(lít)

Explanation:

Under what circumstances may a health insurer charge a higher premium to a woman with a genetic disposition to breast cancer? a) Her mother has breast cancer but she doesn't. O b) She has breast cancer. c) Her sister has breast cancer but she doesn't. d) Health insurers can never discriminate based on genetic information in this way.

Answers

Answer:

D

Explanation:

No company is allowed to discriminate.

A substance has a freezing point of –38°C and a boiling point of 356°C. At what temperature would this substance be in its liquid state?

A) -100°C
B) -50°C
C) 80°C
D) 375°C

Answers

Answer:

X. 80°

Explanation:

if the substance is below -38 then it is in the solid phase (-100° and -50°) and if it is above 356° it is a gas (375°). Therefore anything in the middle is a liquid, 80°.

Given that the substance freezes at  –38°C and boils at 356°C, it will be a liquid at  a temperature of 80°C.

What is liquid range?

The term liqiid range refers to the temperatire range within which a substance remains in its liquid state. Now we are told that the substance freezes at –38°C and boils at 356°C.

Hence, we expect that this substance will be in the liquid state at a temperature of 80°C.

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Determine the mass percentage of carbon, C, hydrogen, H, and oxygen, O, in C6H8O7. Refer to the periodic table for the atomic mass of each element.

Answers

Answer:

C=37.5% H=4.2% O=58.3%

Explanation:

molar mass of element / molar weight of compound X 100% (for each element)

C mass = 12 x 6 = 72

H mass = 1 x 8 = 8

O mass =16x 7 = 112

Molar weight of compound = 192

72/192(100%)= 37.5% C

8/192(100%) = 4.2 % H

112/192 (100%) = 58.3% O

The mass percentage of carbon, hydrogen, H, and oxygen, O, in C₆H₈O₇ is C = 37.5% H = 4.2% O = 58.3%.

What is the mass percentage?

The concentration of an element in a compound or component in a combination is calculated by the mass percentage.

The collective of a component is divided by the entire mass of the mixture to obtain the mass percentage, which is then multiplied by 100%.

Given, finding the mass percentage of carbon, hydrogen, H, and oxygen, O, in C₆H₈O₇

the molar mass of element / molar weight of compound X 100% (for each element

First, calculate the molar mass of the elements given in the compound.

C mass = 12 x 6 = 72

H mass = 1 x 8 = 8

O mass =16x 7 = 112

Molar weight of compound = 192

72/192(100%)= 37.5% C

8/192(100%) = 4.2 % H

112/192 (100%) = 58.3% O

Thus, the mass percentage is C = 37.5% H = 4.2% O = 58.3%.

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The best representation of the ozone molecule incorporates both of the structures that you drew in parts C and D.
Redraw the Lewis structures of an ozone molecule and place a two-ended arrow between the structures, pointing to both
of them. This representation is called a resonance structure.

Answers

Answer:

Explanation:

EDMENTUM

The Lewis structure for ozone contains a central oxygen atom that has a double bond to one oxygen atom and a single bond with the other oxygen atom. The resonance structure of the ozone is shown in the attached figure below.

What is the lewis structure of the ozone molecule?

The oxygen molecule has a valency of -2. It can form two-sigma bonds or covalent bonds with the other atoms. Oxygen contains three lone pairs to form π bonds with other atoms. Ozone contains all three oxygen atoms and is a dihedral molecule with sp² hybridization.

Lewis structure is generally based on the octet rule which states that there should be eight electrons in the valence shell or orbit of an atom for a stable molecule.

The lone pair on the central oxygen atom repels the electrons in the two side bonds and adopt a bent molecular geometry. The expected geometry is the trigonal planar with a bond angle is 120°.

In an ozone molecule, six valence electrons for each molecule of Oxygen so the total number of valence electrons is 6 × 3 = 18. As both Oxygen atoms on the sides have the same electronegativity, therefore, the double bond keeps on shifting from both causing resonances.

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State the type of reaction and balance it properly: NaOH + CaBr2 → Ca(OH)2 + NaBr

Answers

Answer:

2NaOH(aq) + CaBr2(s) → Ca(OH)2(s) + 2NaBr(aq)

The given chemical equation depicts chemical reaction of double displacement type and it's balanced chemical equation is  2 NaOH + CaBr₂ [tex]\rightarrow[/tex] Ca(OH)₂ +  2 NaBr.

What is chemical equation?

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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How many grams of O are in 705 g of N2O ?
mass:
g

Answers

Answer:

O are in 535 g of N2O

Explanation:

15 and extra credit not 14

Answers

Uhhhhhh you need some help or something

Check all of the following that are mixtures.
A) Water
B) Iron
C) Milk
D)Trail mix

Answers

trail mix

mixtures are basically just a combination of things. trail mix is a combination of nuts

Which of the following correctly orders the
events in atomic history?
A. The atom has a small dense positive
nucleus.
B. The atom was a small dense sphere
C.Electrons exist in orbitals, or the most
probable location
D. The atom at electrons stuck in an overall
positive atom
E. Electrons exist in perfect orbits based on
energy levels.

Answers

The history of the atom passed through a certain sequence until our recent interpretation of atomic theory.

The correct sequence of atomic theory is;

The atom at electrons stuck in an overall  positive atomThe atom has a small dense positive  nucleus. Electrons exist in perfect orbits based on  energy levels.Electrons exist in orbitals, or the most  probable location

The beginning of the atomic theory saw the discovery of J.J Thompson which led to the plum - pudding model in which the atom was described as a sphere in which electrons are stuck in an overall  positive atom.

This was followed by Rutherford's planetary model in which he concluded that the atom has a small dense positive  nucleus. This was followed by the model of Bohr in which the electrons exist in perfect orbits based on  energy levels.

Lastly, the contemporary model of the atom is called the wave - mechanical model in which electrons exist in orbitals, or the most  probable location.

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AcipHex is classified as

Answers

Answer:

Rabeprazole belongs to a class of drugs known as proton pump inhibitors (PPIs).

white sugar and iodized salt did the resulting look same throughout?​

Answers

yes the look same after mixing them together.

Because White sugar settles at the bottom of iodized salt. White sugar completely mixed with iodized salt.

Kaya is riding her dirt bike eastward on a dirt road. She spots a pothole ahead. Kaya slows from 20.0 m/s to 6 m/s in 6.0 s. What is her acceleration?

Answers

initial velocity=u=20m/sFinal velocity=v=6m/sTime=t=6s

[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]

[tex]\\ \sf\longmapsto Acceleration=\dfrac{6-20}{6}[/tex]

[tex]\\ \sf\longmapsto Acceleration=\dfrac{-14}{6}[/tex]

[tex]\\ \sf\longmapsto Acceleration=-2.3m/s^2[/tex]

A 125g sample of a mixture of salt and sand contains 12% salt.
a. How much salt (in g) does the sample contain?
b. How much sand (in g) does it contain?

Answers

12 % salt is present in 125 g mixture of salt and sand.
Keep in mind that the total percentage is always 100 %
Therefore, if 12 % is the salt, remaining 88 % must be
sand.
a. The amount of mixture is 125 q. Here, 12 % of 125 is
12 * 125 / 100 = 15 g of salt is present in 125 g mixture.
b. The amount of sand can be calculated similarly, 88 %
of 125 g is 88 * 125 / 100 = 110 g of sand is present in
125 g mixture.

Why is protection from radiation needed?

Answers

Answer:

Because you could die or get seriously burn bad

Answer:

Radiation protection aims to reduce unnecessary radiation exposure with a goal to minimize the harmful effects of ionizing radiation. ... As radiation exposure becomes more prevalent, a thorough understanding of radiation exposure risks and dose reduction techniques will be of utmost importance.

Explanation:

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