Sources of error in colorimetry?

Answers

Answer 1
It is simply not accurate due to many reasons such as environment, user, instrument as well as light which can easily change colours

Related Questions

Please helppp asapppp due soon ignore the answers i put in their wrong

Answers

1. Cu + 2AgNO3 ==> 2Ag + Cu(NO3)2 ... balanced equation. This is both a single replacement reaction and an oxidation reduction reaction.
Moles of Cu present = 19.0 g Cu x 1 mole Cu/63.55 g = 0.2990 moles Cu
Moles AgNO3 = 125 g AgNO3 x 1 mole AgNO3/169.9 g = 0.7357 moles AgNO3
Which reactant is limiting? It will be Cu because the mole ratio is 2 AgNO3 to 1 Cu and there is more than enough AgNO3. Thus, amount of Ag formed will depend on moles of Cu (0.2990)
Moles of Ag formed = 0.2990 moles Cu x 2 moles Ag/mole Cu = 0.598 moles Ag
Mass (grams) of Ag formed = 0.598 moles Ag x 107.9 g/mole = 64.52 g = 64.5 g of Ag (3 sig. figs.)

What is released when a bond between two atoms breaks?
A. Electrical energy
B. Chemical energy
C. Intermolecular force
D. Intramolecular force

Answers

B chemical energy is a form of potential energy,energy is stored in a chemical bond, when that bond breaks chemical energy is released

why is oxygen more electronegative than hydrogen

Answers

Answer:

The attraction of the Oxygen for an electron as measured by the electronegativity of Oxygen is 3.5 which is higher than the electronegativity of Hydrogen at 2.2

Explanation:

how does the number of valence electrons change as you move to the right across the periodic table?

Answers

Answer:

The number of valence electrons goes up by one each time you move

XTRA POINTS 4 CHRISTMAS
What is an empirical formula?

Answers

Explanation:

a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.

Answer:

The answer is A

Explanation:

its is the chemical formula in which the subscripts are given in the smallest ratio

Two samples of solids have similar reactivity with acids and similar densities. Their masses
and volumes, however, are not at all similar. Is it possible that these are the same
substance? (1 point)
O. No, it is not possible because they have different extensive properties.
O Yes, it is possible because they have similar intensive properties.
O Yes, it is possible because they have similar extensive properties.
O No, it is not possible because they have different intensive properties.

Answers

They may be the same substance even though they have different volumes and masses.

Intensive properties are the properties are characteristic  a substance. Intensive properties are those properties of a substance that can be used to describe the substance.

We can see that the substances have similar reactivity and similar density. This means that they may be the same substance even though they have different volumes and masses.

The correct option is; "Yes, it is possible because they have similar intensive properties."

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Let’s Apply B
Directions: Identify the stages in the life cycle of a frog that is being described.
Give the correct answer that is being described.

NONSENSE = REPORT
PLEASE PA SAGOT !!!!!

Answers

Answer:

b a c a b

Explanation:

Will give 10 points.
Why does an atom have a neutral charge?
A It has equal numbers of electrons and protons.
B. The number of neutrons equals the number of protons and
electrons in the atom.
C. It has equal numbers of electrons and neutrons.
D. It has equal numbers of neutrons and protons.

Answers

Answer:

option A it has equal numbers of electrons and protons

Explanation:

electrons are negatively charged and protons are positively charged, so if the numbers of each are equal, then the atom will be neutral.

Answer:

A. it has equal numbers of electrons and protons

Explanation:

The overall charge of every atoms is neutral because the number of electrons and protons is the same. Protons are positively charged while electrons are negatively charged and so they cancel out.

how can knowledge of percent composition help you as a consumer ? how can you promote responsible consumerism ?​

Answers

Answer:

it is a nice question....my mind tells me that the first is it use me as a good vibes and can use to anything the second i will do my best too absorbe it.

Explanation:

Hope this help...

Give one example of how environmental factor could influence the way a gene is expressed.

Answers

Answer:

The presence of drugs or chemicals in an organisms environment can also influence gene expression in the orgains.

The chemical equation below shows the decomposition of ammonium nitrate (NH4NO3). NH4NO3 Right arrow. N2O 2H2O A chemist who is performing this reaction starts with 160. 1 g of NH4NO3. The molar mass of NH4NO3 is 80. 03 g/mol; the molar mass of water (H2O) is 18. 01 g/mol. What mass, in grams, of H2O is produced? 9. 01 18. 01 36. 03 72. 6.

Answers

The mass of water, H₂O produced from the reaction is 72.06 g

We'll begin by calculating the mass of NH₄NO₃ that reacted and the mass of H₂O produced from the balanced equation.

NH₄NO₃ —> N₂O + 2H₂O

Molar mass of NH₄NO₃ = 80.03 g/mol

Mass of NH₄NO₃ from the balanced equation = 1 × 80.03 = 80.03 g

Molar mass of H₂O = 18.01 g/mol

Mass of H₂O from the balanced equation = 2 × 18.01 = 36.02 g

From the balanced equation above,

80.03 g of NH₄NO₃ reacted to produce 36.02 g of H₂O

Finally, we shall determine the mass of H₂O produced by the reaction of 160.1 g of NH₄NO₃.

From the balanced equation above,

80.03 g of NH₄NO₃ reacted to produce 36.02 g of H₂O.

Therefore,

160.1 g of NH₄NO₃ will react to produce = (160.1 × 36.02) / 80.03 = 72.06 g of H₂O.

Thus, the mass of water, H₂O produced from the reaction is 72.06 g

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Which of these questions can be answered using science?

What is the best career?

Does water exist on Venus?

Should the use of automobiles be stopped?

Which is the most interesting subject to study?

Answers

Answer:

B. Does water exist on Venus?

Explanation:

The first question, " which is the best career " isn't answered by science since it's subjective. different individuals will have different views, but I believe, whatever field a particular person like is the best field career. The third question is a " computer and technology " related question along with It being subjective while the forth

the question, just like the up to two questions, it's also subjective but the second question is in fact understandable by science.

Answer:

Does water exist on Venus?

Explanation:

This answer would be answered using science because venus is another planet and we don't have access to it, the only way we would know would be if scientists traveled there and explored it.

Knowing that the solubility of a salt at 80°C is 45g/100 g of H,O, calculate the mass of water required for dissolve 250 g of this salt at 80º C.​

Answers

The mass of water required will be approximately [tex] \bf = 555.6\: g [/tex].

To solve this question, just make a simple rule of three between the amount of salt dissolved at 80ºC and the mass of water:

[tex]\qquad[/tex] 45g of salt [tex] \sf \longrightarrow[/tex] 100g of H₂O

[tex]\qquad[/tex] 250g of salt [tex] \sf \longrightarrow[/tex] x g of H₂O

[tex]\qquad[/tex] [tex]\red{\twoheadrightarrow\bf45\times x = 250\times 100}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf45x=25000[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf x=\cancel{\dfrac{25000}{45}}[/tex]

[tex]\qquad[/tex] [tex]\red{\twoheadrightarrow\bf x = 555.6\:g}[/tex]

Therefore, knowing that the solubility of a salt at 80ºC is 45g/100g of water (H₂O), the mass of water needed to dissolve 250g of this salt at 80ºC will be [tex] \red{\bf = 555.6\: g }[/tex]

__________________________________________________

Chandra wants to know how many moles are contained in 150. 0 g CCl4 (carbon tetrachloride). What quantity of CCl4 should she use to make this conversion? number of moles molecular mass molar mass mole ratio.

Answers

Answer:

Molar mass

Explanation:

The molar mass is the number of grams by which there's exactly one mole of one specific substance. So what you do is divide the grams by the molar mass to obtain the number of moles :).

Answer:

Yep Moler mass is the answer

Explanation:

A solution containing 0.60 moles of sodium hydroxide is added to excess magnesium sulfate in solution. A white solid, magnesium hydroxide, is formed.

a) Write a balanced equation including the states of reactants and products.
b) write the name of the other product formed? ​

Answers

Explanation:

and then name of the other product will be sodium sulphate

which particle diagram represents a sample of oxygen gas at stp

Answers

The diagram in image (4) in the image attached represents a sample of oxygen gas at stp.

Oxygen is a diatomic molecule, a diatomic molecule is a molecule that consists of only two atoms of the same element. In this case, the oxygen molecule consists of two oxygen atoms.

If we look at the diagram in the image attached very well, we will discover that the image in diagram (4) shows a molecule composed of two atoms of the same element and this fits exactly into the description of the oxygen molecule.

Learn more about diatomic molecules:

Particle diagram 4 represents the particles of oxygen at standard temperature and pressure.

A model of molecular (or diatomic) oxygen, which is made up of two oxygen atoms attached to each other through a covalent bond.

Dioxygen, also known as oxygen, is a naturally occurring molecule made up of two oxygen atoms that attach to each other with a strong covalent bond to form oxygen (dioxygen). Oxygen is sp3-hybridized, i.e. it has 4 sp3 hybrids. One of these hybrid orbitals overlaps with the s orbitals of hydrogen to create the O-h sigma bonds.

To learn more about oxygen refer to the link:

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#SPJ6

The diagram in question is attached below.

One group of students is investigating the properties of the bar magnet shown below.
Bar magnet

The students' observations are listed below.

When an iron nail is taken near the North Pole (N) of the bar magnet, it is pulled towards the magnet.
When an iron nail is taken near the South Pole (S) of the bar magnet, it is pulled towards the magnet.
The experiment was repeated by several students using different bar magnets. Based on the investigations, which of these theories would the students most likely propose?

Group of answer choices

magnets attract iron nails

the poles of a magnet attract all materials

iron nails are attracted towards all materials

iron nails have the same properties as magnets

Answers

magnets attract everything with metal inside of it

Answer: magnets attract everything with metal inside of it

Explanation:

What role do plants play in reducing carbon dioxide in the atmosphere? How can plants play a role in combating climate change?
Please help!!? ASAP

Answers

Answer:

an indirect cooling effect.

Explanation:

they play that role by reducing water vapor in the heat .

HELP WILL MARK BRAINLIEST
If an electrically charged plastic bag is placed close to an uncharged cloth, what will happen?

The charge of the bag will change.
The charge of the cloth will change.
The plastic bag will attract the cloth.
The plastic bag will repel the cloth.

Answers

Answer:the plastic bag will attract the cloth

Explanation:

Answer:

c

Explanation:

hope this helps

calculate the volume in dm3 occupied by 26.4 g of carbon dioxide​

Answers

Density of carbon dioxide=1564kg/m^3Mass=26.4g=0.0264kg

[tex]\\ \sf\longmapsto Density=\dfrac{Mass}{Volume}[/tex]

[tex]\\ \sf\longmapsto Volume=\dfrac{Mass}{Density}[/tex]

[tex]\\ \sf\longmapsto Volume=\dfrac{0.0264}{1564}[/tex]

[tex]\\ \sf\longmapsto Volume=1.687m^3=1.69m^3[/tex]

1m^3=1000dm^3

[tex]\\ \sf\longmapsto Volume=1.69(1000)=1690dm^3[/tex]

What does it mean when the
frequency of a wave increases?

A. the amplitude increases
B. the amplitude decreases
C the wavelength becomes shorter
D. the wavelength becomes longer

Answers

Answer:

The answer is C

Can you put a brainliest for me

Explanation:

Answer:

the wavelength becomes shorter

Explanation:

frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.

Which of the following would
9 indicate a new substance has
been formed?
Bubbling and fizzing
occur.
Powder dissolves in
an unknown liquid
A beaker of
hydrochloric acid
evaporates after
several days
Solid iron is melted to
a liquid
Color YELLOW
Color ORANGE
Color PINK
Which one?

Answers

Answer:

Bubbling and fizzing are likely to occur when a new substance is formed. The other examples are simply changing to a different form of the same substance.


Find the volume of hydrogen gas that reacts with 200 cm of nitrogen gas
measured at the same temperature and pressure.
N2 + 3H2(g) 2NH3(g)

Answers

Answer:

15 L

Explanation:

The important thing to remember about reactions that involve gases kept under the same conditions for pressure and temperature is that the mole ratios that exist between the gases are equivalent to volume ratios.

This can be proven using the ideal gas law equation for two gases kept at a temperature

T

and a pressure

P

.

P

V

1

=

n

1

R

T

the ideal gas law equation for the first gas

P

V

2

=

n

2

R

T

the ideal gas law equation for the second gas

Divided these two equations to get

P

V

1

P

V

2

=

n

1

R

T

n

2

R

T

This means that you have

n

1

n

2

=

V

1

V

2

the mole ratio is equivalent to the volume ratio

In your case, the balanced chemical equation looks like this

N

2(g]

+

3

H

2(g]

2

NH

3(g]

The problem tells you that this reaction takes place at constant temperature and pressure. You don't need to know the exact values, you just need to know that they are constant for all three chemical species.

You can thus say that since you have a

1

:

3

mole ratio between nitrogen gas and oxygen gas, you will also have a

1

:

3

the volume ratio between these two gases

n

N

2

n

H

2

=

V

N

2

V

H

2

=

1

3

The volume of hydrogen gas needed to react with that much nitrogen gas will thus be

5.0

L N

2

3

L H

2

1

L N

2

=

15 L H

2

Calculate the density of sulfur dioxide gas (SO2) at 147°C and 29.9 kPa.

Answers

The density of the gas is obtained as  0.55 g/L.

We can find the density of the gas using the relation;

PM = dRT

P = pressure of the gas

M = molar mass of the gas

d = density of the gas

R = gas constant

T = temperature

Now;

P = 29.9 kPa

R = 8.314 L·kPa mol·K.

T =  147°C + 273 = 420 K

d = ?

M = 64 g/mol

Substituting values;

d = PM/RT

d =  29.9 kPa ×  64 g/mol/ 8.314 L·kPa mol-1K-1 420 K

d = 1913.6/3491.88

d = 0.55 g/L

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what is a “ medium” in regards to waves ?

Answers

A medium can be anything that a wave can pass through e.g the medium can be solid objects, air, water, etc.
In a similar manner, a wave medium is the substance that carries a wave (or disturbance) from one location to another. ... In the case of our slinky wave, the medium through that the wave travels is the slinky coils. In the case of a water wave in the ocean, the medium through which the wave travels is the ocean water.

What is a trial? please​

Answers

examination by a test; experiment, as in chemistry, metallurgy, etc.

3CaCl2 + Al2O3 —> 3CaO + 2AlCl

Answers

im not sure about the answer sorry in advance if it's wrong

In the conclusion to the snake mole lab, you have to convert 3.45 moles of (NH4)2S04 to
grams. What is the molar mass of (NH4)2504?

Answers

Molar mass = 132.14g/mol

which acids are found In lemon and milk​

Answers

Answer:

lemon- citric acid

milk- lactic acid

Answer:

lemon=citric and malic acids.

milk=Lactic Acid

Explanation:

PLEASE HELP

When an electron in a hydrogen atom drops from the fifth energy level to the second energy level 4.58 x 10-19 J of energy is released What is the frequency of the photon that is produced?

Answers

Answer:  

e=hf conversion

hope it helps! stay safe as always!

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