Answer:
The lack of accuracy and underestimation of absorbance readings obtained from the colorimeter can be contributed to many experimental factors. One plausible error is from the imperfection of the absorber, in that it may not completely absorb the stray light passing by the perimeters of the photoresistor.
Explanation:
In practice there are other sources of error, such as environmental effects on photometer and sample, temperature, line voltage fluctuations, vibrations, contamination, or heating of the sample by the photometer. All these factors may impair the measured result, and ways and means are known to test and eliminate them.
a 7.221 g sample of a compound contains 1.990 g carbon, 2.341 g hydrogen, and the rest is oxygen. Determine the
percent composition of the compound
Answer:
17.19%
Explanation:
mass of oxygen = 7.221 - (1.990 + 2.341)
= 2.890g
Empirical formula of the compound
For carbon,
1.990/12 = 0.1658
For hydrogen,
2.341/1 = 2.341
For oxygen,
2.890/16 = 0.1806
0.1658 ÷ 0.1658 = 1
2.341 ÷ 0.1658 = 14.11
0.1806 ÷ 0.1658 = 1.089
Empirical formula of the compound= CH14O
Molar mass= (1×12) + (14×1) + (1×16)
= 12+14+16
= 42g/mol
percentage composition= 7.221/42 × 100
= 17.19%
which of the following is a pure substance that contains two or more elements?
Answer:
pure substance does not contain two or more elements
Choose all of the examples that show a chemical change.
A) A woodpecker digs in the bark.
B) A dead tree rots on the ground.
C) A forest fire burns a lot of trees.
D) A farmer is cutting logs with an axe.
E) A tree drops rainwater from its leaves.
Answer:
B and C
Explanation:
Answer:
B) A dead tree rots on the ground.
C) A forest fire burns a lot of trees.
Explanation:
It cannot return the the state it was in before or have the same composition it had before.
electric current is passed through water, it decomposes inti hydrogen and oxygen. write full balanced chemical equation for the reaction
Answer:
2H2O ------------------] 2H2 + O2
What is the relationship between layering of fluids and density?
Density of a liquid determines how it will layer (heaviest to lightest). If the liquid is least dense it will float to the bottom. Layers will remain separated because each liquid is actually floating on top of the more dense liquid beneath it.
PLEASE HELP
2.How many atoms are in 3.35 moles of Aluminum?
3.How many moles of CO2 gas are in a 101.25 L container filled with CO2 gas?
4.What is the mass of 13.7 moles of N2 gas?
Answer:
2: 2.02 x 1024 atoms
3: 4.5201 atoms
4: 384 g/mol
Explanation: I'm in your class
Direction: To compare and differentiate the animal and plant cell base on the presence and absence of certain organelles.Fill in the corresponding organelles in the Venn Diagram
please please answer this question properly i need it!!!!!!
Answer:
hi what are you doing
Explanation:
............
how many moles of oxygen would you need to produce 4 moles of aluminum oxide? 4 Al + 3 O2 ----> 2 Al2O3
Answer:
6 moles
Explanation:
3 moles of O2 produce 2 moles of Al2O3 so in order to produce 4 moles pf AL2O3 you need 4 x 3 /2 moles of O.
has an atomic number of 1.
There are many with atomic number 1
hydrogen , helium , lithium , beryllium etc.
Hope this answer helps you dear!.
Answer:
With atomic number 1 is hydrogen
Explanation:
The valence with 1 is hydrogen, lithium.....
how much water will you need to add to your working solution to get to a 100 ml total volume of a 0.03m nacl solution?
Answer:
The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up ...
plizzz helpppp
consider the photo
Question 20 0/1 pts What is the frequency of a light wave with the wavelength of 680 nm? 'Reminder: the speed of light is 3.00 X 10 m/s
Answer:
[tex]4.4*10^{14}[/tex]Hz
Explanation:
How many moles of water is 5.02x1018 molecules
of water?
Answer:8.334×10^-6 moles
Explanation:
a mole is 6.023×10^23
5.02×10^18 ÷ 6.023×10^23=8.33×10^-6
which two observers would be experiencing the same apparent solar time?
The observers which would experience the same apparent solar time are observer B and observer E. This means the correct response as per the full question indicated in the attached document is number 2.
Types of Solar TimeThere are two types of Solar Time. They are:
Apparent Solar Time and Mean Solar TimeWhat is Apparent Solar Time?Apparent solar time refers to the time of the day that is shown by the hour angle of the sun. It is also defined as the sun's position in the sky going by direct observation. Direction observation of the sun to determine Solar Time is possible using a Sundial.
See the link below for more about Apparent Solar Time:
https://brainly.com/question/6336054
substance x reacts with sodium carbonate to form a gas . The gas turns lime water cloudy. What is substance K and which process takes place in the reaction?
When sodium carbonate reacts with hydrochloric acid, Carbon dioxide gas is released. Pass the gas through calcium hydroxide,the solution turns milky indicating that the gas is Carbon dioxide .
The substance K is hydrochloric acid and this is called as neutralisation.
hope this helps u
◌⑅⃝●♡⋆♡MICKZMINNZ♡⋆♡●⑅◌
Substance x is an acid. The process that takes place in the reaction is a Neutralization reaction
Neutralization reactionFrom the question, we are to determine what substance x is.
First, we will identify the gas given off.
The gas that turns lime water milky is carbon (IV) oxide (CO₂) gas.
RECALL: Acids react with carbonate to produce salt and water with the release of carbon dioxide gas.
Hence, substance x is an acid. The process that takes place in the reaction is a Neutralization reaction.
Learn more of Neutralization reaction here: https://brainly.com/question/2632201
Pls help if you only know the correct answer! Thanks! :)
18. the blank should be "[tex]CO_{2}[/tex]"
19. the question seems to be answered.
20. [tex]CH_{3}[/tex]
True or False: A food chain is the feeding relationships among all the organisms in an
ecosystem.
Answer:
False.
Explanation:
A food web is the feeding relationships among all the organisms in an
ecosystem.
.・。.・゜✭・have a nice day・✫・゜・。.
why is it hotter in the summer and colder in the winter?
Answer: During the summer, the sun's rays hit the Earth at a steep angle. ... Also, the long daylight hours allow the Earth plenty of time to reach warm temperatures. During the winter, the sun's rays hit the Earth at a shallow angle. These rays are more spread out, which minimizes the amount of energy that hits any given spot.
noble gases are used in many situations where a safe and constant environment must be maintained. for example, helium is used to provide a protective atmosphere for making fiber optics and semiconductors. argon is used to fill incandescent and flourescent light bulbs to prevent oxygen from corroding the hot filament. why are noble gases used in these situations?
Answer:
Noble gases have a complete valence electron shell making them stable and nonreactive.
Explanation:
When water changes state from solid to liquid to gas, ALL BUT one thing happens. There is no
A) chemical change.
B) physical change.
C) addition of energy.
D) increase in temperature.
How can you tell the difference between two clear liquids
Answer:
To identify a pure liquid substance using the physical properties of solubility, density, and boiling point. The physical properties of a pure substance can be measured without changing the composition of the substance.
Explanation:
How does distillation remove hardness from water
Answer:
Distillation can be used to soften water as the water evaporates as it is heated and the ions are left behind.
Hope that helps. x
Answer: Distillation can be used to separate and collect a liquid from a solution. Distillation can also be used to soften water as the water evaporates as it is heated and the ions are left behind. Hard water can be softened by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.
Explanation:
calculate the volume in dm3 occupied by 26.4 g of carbon dioxide
[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]
3CaCl2 + Al2O3 —> 3CaO + 2AlCl
im not sure about the answer sorry in advance if it's wrong
Why does atomic radii decrease as you move from the left to right across the period
Answer:
This is because, within a period or family of elements, all electrons are added to the same shell.
When we move from left to right across the periodic table, we can see that the atomic radii keeps decreasing. This is because, as you move from left to right, the nucleus gains protons. The atomic number increases and hence the valence electron will feel more attracted towards the nucleus & the atomic radii will decrease.
[tex]\mathbb{MIREU}[/tex]
A scientist tested a series of solutions to determine their pH, and recorded the results in this table.
Substance pH
A 9
B 12
C 11
D 14
According to this data, which solution would be most effective at neutralizing a strong acid?
Substance A
Substance B
Substance C
Substance D
Answer:d
Explanation:
Q2. Fill in the blank with correct words.
A: Chemical B: Horizontal C: Shells D: Columns E: Group VII
1) The vertical ___________are called groups and the_____________rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer_______________ for example, all the elements in ___________ have 7
electrons on their outer shells.
3) Elements in the same group have similar ___________ and physical properties
Answer:
Explanation:
1) The vertical Columns are called groups and the Horizontal rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer Shells for example, all the elements in Group VII have 7
electrons on their outer shells.
3) Elements in the same group have similar Chemical and physical properties
Explanation:
1) Columns
Horizontal
2)Shell
Group VII
3)Chemical
How far do you think a plate can move in one day?
what would u add if the soil is too basic~~ ?
Slaked lime is the ans
thank me later : p
What is the word equation for atoms of magnesium reacting with molecules of oxygen to produce magnesium oxide? magnesium magnesium oxide Right arrow. Oxygen magnesium oxygen Right arrow. Magnesium oxide magnesium oxide oxygen Right arrow. Magnesium magnesium oxygen Right arrow. Magnesium oxygen.
The word equation for atoms of magnesium reacting with molecules of oxygen to produce magnesium oxide is:
Magnesium and oxygen right arrow Magnesium oxide
Chemical equations basically has two sides
Reactant ProductThe reactants are located on the left hand side while the products are located on the right hand side. The reactants and products are separated by an arrow symbol as shown below:
Reactant —> product
With the above information in mind, we can obtain the answer to the question as follow:
Reactant = Magnesium and oxygen Product = Magnesium oxideReactant —> product
Magnesium + oxygen —> Magnesium oxide
Magnesium and oxygen right arrow Magnesium oxide
Learn more on chemical equation: https://brainly.com/question/14338095
Answer:
B
Explanation:
i think this is right :)