Answer:
true
Explanation:
It is because it appears uniformly in the eye
A student decided to use the titration technique to find out the concentration of
Acetylsalicylic acid (ASA) from a sample that arrived at the laboratory. He
took three samples of 0.1830, 0.1903 and 0.1851 (grams) and titrated with NaOH
0.497 M and spent on the titration 16.0 – 18.3 and 17.3 ml respectively in each
sample. Calculate the percentage of acetylsalicylic acid in the samples. THE
Sample packaging says contain 92% AAS, calculate absolute and relative error
in this degree.
C8H7O2COOH(aq) + NaOH(aq) C8H7O2COONa(aq) + H2O(l)
From the mole ratio of the reaction, the mass of ASA reacted is greater than the mass of ASA sample indicating an error in some of the data provided.
What is the titration technique?Titration is a technique in analytical chemistry in which the volume of solution A of known concentration needed to react with another solution B of unknown concentration is used to determine the unknown concentration of the solution B.
The equation of the reaction between acetylsalicylic acid (ASA) and NaOH is given below:
C8H7O2COOH(aq) + NaOH(aq) C8H7O2COONa(aq) + H2O(l)1 mole of ASA reacts with one mole of NaOH
Molar mass of ASA = 180 g/mol
For first sample:
Volume of NaOH = 16.0 mL = 0.016 L
Moles of NaOH reacted = 0.016 × 0.497 = 0.007952 moles
Therefore, moles of ASA reacted = 0.007952 moles
Mass of ASA reacted = 1.43136 g
However, mass of ASA sample = 0.1830 g
The mass of ASA reacted is greater than the mass of ASA sample.
This means there is an error in the data provided.
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1. The formula of a compound is M(OH)2. Given that the M, of the compound is 98, calculate the A, of M.
A. 64
B. 16
C. 32
D. 8
Answer: C
Explanation:
Which sentence describes matter?
A. Matter is a force that acts on mass.
O B. Matter is emitted as a form of energy.
C. Matter is created from heat and light.
D. Matter occupies space and has mass.
Answer:
D.
Explanation: your welcome :)
Sentence that does describe matter
Matter occupies space and has mass.
What is matter?Matter is defined as the physical substance that occupies mass means can be weighed and space means volume.
Supporting answer
Matter is anything that occupies mass and space. It is very different from heat, light and energy. Matter can be weighed and its volume can be measured.
Therefore, Matter occupies space and has mass.
Hence, option D is correct.
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How do you know if the girl your dating is into the size or onto personality? 100 POINTS
Answer:
here
Explanation:
My guess is if she's into you for your size she's gonna want to have s## alot, but if she's into your personality she wants to hang out with you and compliments you this is my guess so sorry if this isnt good
The half life of Uranium-238 is 4.5 billion years and the age of earth is 4.5 X 109 years. What fraction of Uranium-238 that was present when Earth was formed still remains?
The half-lifes of Ur 238 are 4.5 bn years such as the age of the formation of the planet. The earth's formation is 4.5 billion years x 109 years.
The fraction of Ur 238 that was found n the earth still remains to be 1/2 that is 50%.Learn more about the 238 is 4.5 billion years and the age of the earth.
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Lisa is using a calorimeter that contains 255 g of water at 19°C. She places 99 g of a liquid substance inside of the calorimeter and closes the lid. The substance undergoes a reaction and crystallizes. Lisa measures the new temperature of the water inside the calorimeter at 29.2°C. Recall that the specific heat of water is 4.18 J/g-°C. What is the enthalpy of fusion (ΔHf) of the substance? Show all steps of your calculations.
Based on the data provided, the enthalpy of fusion (ΔHf) of the substance is 109.82 J/g.
What is the enthalpy of fusion of a substance?The enthalpy of fusion of a substance is the amount of heat evolved or absorbed when the substance undergoes a phase change from liquid to solid or vice versa.
From the principle of conservation of energy, heat lost = heat gained.
Heat gained by water = heat lost by fluidHeat gained by water = mass × specific heat × temperature change.
Heat lost by liquid = mass × enthalpy of fusion of liquid
255 × 4.18 × (29.2 - 19) = 99 × ΔHf
ΔHf = 109.82 J/g
Therefore, the enthalpy of fusion (ΔHf) of the substance is 109.82 J/g.
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A reaction of 58.1 g of Na and 54.9 g of Br2 yields 67.8 g of NaBr . What is the percent yield?
What is one thing about science you love?
Answer:
science tells us that our collective consciousness is rare, I am inspired to love deeper and connect with others.
Examine the following reaction: 5FeCl2(aq) + KMnO4(aq) + 8HCl(aq) → 5FeCl3(aq) + MnCl2(aq) + KCl(aq) + 4H2O(l) Which element has undergone reduction?
The element which has undergone reduction is Manganese (Mn)
Redox reactionFrom the question, we are to determine which element has undergone reduction
First, we will define the terms oxidation and reduction
Oxidation
Oxidation can be defined as gain of oxygen. It can also be defined as an increase in oxidation state
Reduction
Reduction can be defined as loss of oxygen. It can also be defines as a decrease in oxidation state.
Now, we will determine the oxidation numbers of the elements both in the reactants and products sides
For FeThe oxidation state of Fe changed from +2 to +3. An increase in oxidation state indicates oxidation
For ClThe oxidation state of Cl did not change. It is -1 both in the reactants and products sides
For KThe oxidation state of K did not change. It is +1 both in the reactants and products sides
For MnThe oxidation state of Mn changed from +7 to +2. A decrease in oxidation state indicates reduction.
Hence, the element which has undergone reduction is Manganese (Mn).
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NOTE: The oxidation states of O and H (oxygen and hydrogen) did not change.
If you can’t see it, how do you know it’s there?
Answer:
Our 4 Senses
Explanation:
You see, even though we see cant see something, that doesn't mean that it isn't there, for example, bacteria, the wind, and particles. We cant see any of them, at least with just the human eye, but we still are aware that all those things are there.
Our 4 Senses can help us identify things we cant see, lets start off with our sense of "smell"
Lets say there is a amazing new chef in town who just made the best load of bread, your not sure where her/his restaurant is but you can smell that French bread all the way from your house.
You see, you know that it is there, but you cant see it! All our senses help us identify this, so just to prove my point a bit more, lets try one more sense.
Lets finish the night off with one of our other sense "Hearing"
Lets pretend there is a beautiful bird chirming, you look outside your window but you cant see the little bird, you know its there, but you cant see it.
What I'm trying to say is, even though we cant see something, it doesn't mean it isn't there, and our senses help us!
I hope this helped! If you dont understand something or would like more of an explanation, feel free to contact me! :D
Eddie experimented to find out which freezes at a lower temperature, distilled water or salt water. The steps he used in his experiment are shown below.
1Fill one beaker with 250 mL of room-temperature distilled water
2Fill another beaker with 250 mL of room-temperature salt water
3Measure the mass of the liquid in both beakers
4Place both beakers in a freezer
Observe the temperature at which the liquids freeze
Which of the steps in Eddie's experiment was NOT needed?
A.4
B.2
C.3
D.1
Answer:
the answer is C. 3. measure the mass of the liquid in both beakers
Answer:
C: 3
Explanation:
Calculate the mass, in grams, of 532.0 atoms of cadmium, Cd (1 mol of Cd has a mass of 112.41 g).
The mass, in grams, of 532.0 atoms of cadmium is 9.93 × 10⁻²⁰ g
StoichiometryFrom the question, we are to determine the mass of the given atoms of cadmium
First, we will calculate the number of moles of cadmium present
Using the formula,
[tex]Number\ of\ moles = \frac{Number\ of\ atoms}{Avogadro's\ constant}[/tex]
Then,
Number of moles of Cd present = [tex]\frac{532.0}{6.022 \times 10^{23} }[/tex]
Number of moles of Cd present = 8.83427 × 10⁻²² moles
From the given information,
1 mole of Cd has a mass of 112.41 g
Therefore,
8.83427 × 10⁻²² moles will have a mass of 8.83427 × 10⁻²² × 112.41 g
8.83427 × 10⁻²² × 112.41 = 9.9306 × 10⁻²⁰ g
≅ 9.93 × 10⁻²⁰ g
Hence, the mass, in grams, of 532.0 atoms of cadmium is 9.93 × 10⁻²⁰ g
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acid rain is created when chemicals in _____ react with ____.
A. Smog and water vapor
B. Fertilizers and water
C. Fertilizers and sunlight
D. Smog and sunlight
Answer:
A:smog and water vapor
Explanation:
Smog and water vapor
The answer is A: Smog . . . Water Vapor
An atom with the same number of protons and electrons has charge of
Answer:
Explanation:
0
All the charges of the protons are cancelled out by all the charges on the electrons.
If you were to repeat this experiment using an entire 16.5 g beer can and get the
same percent yield, what mass of alum would you expect? (I got .126% yield)
The mass of alum expected is mathematically given as
Ma= 365.904 g
Question Parameters:
Beer can mass (aluminium metal ) = 16.5 g
% yield = 126 % = 1.26
Generally, the equation for the Mass of alum is mathematically given as
M=Beer can mass * 1 g of alum produce
M= 16.5 x 17.6
M= 290.4 g
therefore, the Mass of alum expected
Ma= % yield x mass of alum
Ma= 1.26 x 290.4
Ma= 365.904 g
In conclusion, the mass of alum expected is
Ma= 365.904 g
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Which option describes cations?
A: elements that readily give off electrons in a chemical reaction
B: a family of elements located in Group 17 of the periodic table
C: positively charged ions
D: elements that tend to accept electrons when they engage in chemical reactions
Answer:
C: positively charged ions
Explanation:
C: positively charged ions
A rock is a naturally occuring solid mixture of one or more of the following: *
A: minerals, lava, and water
B: minerals, limestone, basalt, and granite
C: minerals, sediment, crystals, and organic matter
D: minerals, clastic, felsic and mafic
Answer:
A
Explanation:
Because minerals and lava
which statements describe density? chech all that apply
How is the motion of the water molecules effected by the temperature of the water?
Answer:
Temperature causes water molecules to move more quickly, because each individual molecule has more energy as it gets hotter. If you get water hot enough, the molecules move so much that the hydrogen bonds that hold them together start to break and the water becomes a gas.
Molecular compounds result from covalent bonding which are called _______.
This is for high school physical science
Answer:
Diatomic Molecule
Explanation:
Which term describes energy stored in the bonds between atoms?
A) Nuclear B)Chemical C)Thermal D) Sound Energy
Answer:
B.) Chemical
Explanation:
The energy stored in the bonds between atoms is referred to as chemical energy. I hope this helps! ^-^
You add 0.59 mL of n-propanol (0.803 g/mL, 60.1 g/mol) to an excess of acetic acid to create the pear ester propyl acetate (102.1 g/mol). If you obtain 0.54 grams of the product, what was your percent yield
The percentage yield of the reaction between n-propanol and excess of acetic acid is 67.5%
How to determine the mass of n-propanolVolume = 0.59 mL Density = 0.803 g/mLMass of n-propanol =?Mass = Density × Volume
Mass of n-propanol = 0.803 × 0.59
Mass of n-propanol = 0.47 g
Balanced equationSee attached photo
Molar mass of n-propanol = 60.1 g/mol
Mass of n-propanol from the balanced = 1 × 60.1 = 60.1 g
Molar mass of propyl acetate = 102.1 g/mol
Mass of proply acetate from the balanced equation = 1 × 102.1 = 102.1 g
SUMMARY
From the balanced equation,
60.1 g of n-propanol reacted to produce 102.1 g of propyl acetate
How to determine the theoretical yieldFrom the balanced equation,
60.1 g of n-propanol reacted to produce 102.1 g of propyl acetate
Therefore,
0.47 g of n-propanol will react to produce = (0.47 × 102.1) / 60.1 = 0.8 g of propyl acetate
How to determine the percentage yield Actual yield of propyl acetate = 0.54 gTheoretical yield of propyl acetate = 0.8 gPercentage yield =.?Percentage yield = (Actual / Theoretical) × 100
Percentage yield = (0.54 / 0.8) × 100
Percentage yield = 67.5%
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word equation into balanced formula equation carbon+oxygen=carbon dioxide
Explanation:
hope it helps, Godbless
Answer:
C + O = CO2
this is the correct answer
Construct a model to show the movement of matter and energy from plants into other organisms. Show how mass and energy are conserved before and after each interaction. For example, the beginning substances before an interaction equal the ending substances, and vice versa.
I listed a student example I need something like the example but for photosynthesis asap I will give 100 points to whoever has the correct answer
Plants obtain energy from the sun during photosynthesis and pass it along the food chain.
What is a model?A model is a representation of reality. We use models to understand what the real situation of things is like.
Let us recall that plants are the producers in the ecosystem. Energy flow from plants to animals. Plants obtain energy via the reaction 6CO2 + 6H2O --->C6H12O6 + ATP. This energy is passed along the food chain as organisms feed on each other.
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What is the difference between the short and long carbon cycles?
Carbon is a versatile substance. As opposed to becoming sugars, carbon gets repurposed to become fossil fuels like coal.
What is carbon cycle ?
The carbon cycle is the ongoing process through which carbon atoms move back and forth between the atmosphere and the Earth. The amount of carbon in this closed environment our planet and its atmosphere does not alter because of this.
The carbon cycle describes how carbon moves among various carbon reservoirs or "carbon sinks" that are present on Earth. It is essential for preserving our planet's carbon balance and stable temperature.
The carbon cycle controls carbon naturally, which is essential for life on Earth. The Earth would be frozen without it.
Thus, the long-term carbon cycle puts carbon in motion. However, this cycle differs from the short-term carbon cycle in that it takes millions of years to complete its circuit
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A. Calculate the molarity of solution of "sodium sulfate" that contains 5.2 grams sodiums sulfate diluted to 500mL.
B. How many moles of sodium are in the solution
A. The molarity of solution containing 5.2 g of sodium sulphate is 0.0732 M
B. The number of mole of sodium in the solution is 0.0732 mole
How to determine the mole of sodium sulphate Na₂SO₄Mass of Na₂SO₄ = 5.2 gMolar mass of Na₂SO₄ = (23×2) + 32 + (16×4) = 142 g/mol Mole of Na₂SO₄ =?Mole = mass / molar mass
Mole of Na₂SO₄ = 5.2 / 142
Mole of Na₂SO₄ = 0.0366 mole
A. How to determine the molarity Mole of Na₂SO₄ = 0.0366 mole Volume = 500 mL = 500 / 1000 = 0.5 L Molarity =?Molarity = mole / Volume
Molarity = 0.0366 / 0.5
Molarity = 0.0732 M
B. How to determine the mole of sodium (Na)1 mole of Na₂SO₄ contains 2 moles of Na.
Therefore,
0.0366 mole of Na₂SO₄ will contain = 0.0366 × 2 = 0.0732 mole of Na
Thus, 0.0732 mole of Na is present in the solution.
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what do i put in the columns?
Answer:
You are putting in the percent error is my guess.
Explanation:
When you were completing this chart what percentage of error was there?
No clue if this is correct!!
Determine the number of moles of H in each sample.
1. 4.56 mol H2O
2. 7.86 mol NH3
3. 0.113 mol N2H4
4. 36.0 mol C10H22
Explanation:
I answered your question in a photo sent
Malia was able to make a paperclip float on the surface of water. What will most likely happen to the paperclip if a drop of dishwashing detergent is added near it?
Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float.
Soap makes the water less viscous making the paperclip sink.
Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink.
Soap makes the water more viscous allowing the paperclip to continue to float.
Answer: Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float.
Explanation: Answer A
Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float.
How does soap affect the intermolecular forces of water?A cleaning soap bubble has a polar give up and a nonpolar give up. Water is a polar molecule. The polar cease of the cleaning soap molecules are attracted to every other. The nonpolar ends of the soap molecules stand proud of the water and assist preserve bubbles collectively.
What happens while the soap is added to water?Adding cleaning soap lowers the water's surface anxiety so the drop turns weaker and breaks apart sooner. Making water molecules stick collectively less is what helps soaps easy dishes and garments greater without problems.
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What are the main reasons we cannot power the earth with 100% of renewable energy? Explain what can be done, or needs to be done to eventually achieve this goal.
Help me please lol TwT
Answer:
the number one reason we cannot power the Earth with 100% renewable energy is because our dependence on nonrenewable energy(fossil fuels)...,but with technological advances in solar energy and the latest innovation in biofuels I wouldn't be surprised if we (humans) are powering our electronics with simply the steps we take in our daily routine.