The dissolution of a substance in another is a kind of chemical reaction.0.4575 g of saccharine is present in the ten tablets of saccharine dissolved in water.
From the information in the question, the sulfur in saccharin (C7H5NO3S) was completely converted to sulfate ion (SO4^2-). This ion was now reacted with excess barium chloride to form barium sulfate BaSO4. This later reaction occurs as follows;
SO4^2-(aq) + Ba^2+(aq) --------> BaSO4(s)
Number of moles of BaSO4 obtained = 0.5240 g/233 g/mol
= 0.0025 moles
Since the reaction is 1:1, 0.0025 moles of sulfate ions from saccharine reacted.
Molar mass of saccharine = 7(12) + 5(1) + 14 + 3(16) + 32
= 84 + 5 + 14 + 48 + 32 = 183 g/mol
Mass of saccharine in the tablet = 0.0025 moles × 183 g/mol
= 0.4575 g
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Please for real help me, show work !
Answer:
27)
a. Silver nitrate
b. Lead chromate
c. Anhydrous magnesium acetate
d. Copper nitrate
28) a. KNo3
which of the materials above are mixtures
Answer:
water and vinegar
:salad
Explanation:
There is two kind of mixture the heterogeneous and homogeneous mixture.Which water and vinegar is the homogeneous and the salad is heterogeneous mixture based on my example above.
When a sample of iron ore of mass 2.016 g is treated with 50.0 mL of hydrochloric acid, the iron dissolves in the acid to form a solution of . The solution is diluted to 100.0 mL and the concentration of ions is determined by spectrometry to be . What is the mass percentage of iron in the ore
The element vanadium had a line with a wavelength of 318.5 nm in its emission spectrum. What is the frequency of this line
The frequency of this line of vanadium is 9.38 x10 ^14 Hz.
Emission spectrum shows how the electron of an atom goes or moves from a higher to a lower energy level.
Now The energy of a photon is given by
E = hc/λ
where
h = Plank's constant = 6.626 x 10⁻³⁴ J s
c = speed of light= 3 x 10⁸ m/s
λ = wavelength = 318.5 x 10⁻⁹ m
Solving
E = (6.626 x 10⁻³⁴ J s x 3 x 10⁸ m/s) / 318.5 x 10⁻⁹ m
E =6.2166 x10 ^-19 J
Also, we know that energy is related to frequency by the equation
E =hf
Where;
h = Planks's constant
f = frequency of photon
Making frequency subject of the formulae
f = E/h
f =6.2166 x10 ^-19 J/ 6.626 x 10⁻³⁴ J s
f = 9.38 x10 ^14 Hz
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PLZ ANSWER ASAP CHEMISTRY LAB REPORT
I am doing an investigation where I simply throw a piece of paper that has been lit on fire, into a glass bottle/jar, and then throwing a hard boiled egg in the jar. Asides the outcome, equations, or whatnot with all that Chemistry stuff, I want to know:
What is the constant and what is variable?
*Thank you to anybody whom can answer, but please, please, please, give me the right answers. These labs are worst the most of my grade and I already have a D- in Chemistry.
Answer:
welp to bad got nothing for you ezcecect good luck bye btw its always the one you think its not
Explanation:
dugg
60) Which of the following is a chemical property?
A) Sugar is a solid at room temperature.
B) Potassium reacts with water to form potassium hydroxide.
C) Sugar dissolves in water.
D) Gasoline and water do not mix.
.
Answer:
C is the answer. Sugar Dissolves in water
Explanation:
Brainliest Maybe
Sugar dissolves in water is a chemical property. Therefore, option C is correct.
What do you mean by chemical properties ?Chemical properties describe a substance's characteristic ability to react to form new substances; they include flammability and corrosion susceptibility. A pure substance's chemical and physical properties are the same in all samples.
A chemical property is the ability or inability to change one type of matter into another. Chemical properties include flammability, toxicity, acidity, reactivity, and heat of combustion.
A chemical property explain the ability of a substance to undergo a specific chemical change. To verify a chemical property, we look for a chemical change.
Thus, Sugar dissolves in water is a chemical property, option C is correct.
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#SPJ2
An atom contains three protons, two neutrons, and one electron. What is the charge of the nucleus?
A: 3+
B: 5+
C: 2+
D: 0
Answer:
A.3+
Explanation:
️️️️️️️️️️️️️️
Give one example of a question that science could test. Then, explain in your own words why it is an example of a scientific question. Please!
Answer:
Questions are an essential part of science. ... They state the final question in a way that can be answered by investigation or experiment. A good scientific question is: “What effect does the pH of water have on radish seed germination?” Good scientific questions are defined, measurable, and controllable.
why does exercising causes the change in our body ( breathing/heart rate)
Answer:
Explanation:
The biggest change in the body caused by regular exercise is to muscle tissue. ... At the cellular level, exercise triggers the release of substances that dilate the blood vessels in the muscle, letting in more oxygen, says Prof Bradford. These are short-term effects, but deeper changes come with regular exercise.
Exercising causes changes in our body because we're working our muscles so there's more going on with us compared to when we're just laying down. We need more oxygen to go to our muscles so we breathe harder and more rapidly. Our heart also beats faster because it needs to pump more blood to the muscles that are being worked.
1. Boiling
2. Opposite
3. Freezing
4. The particles lose energy to the surroundings
5. Condensation
6. B
7. E
8. D
9. A
10. C
That is my question don't liy
Please answer question (e)
Answer:
I don't know sorry am read in 5 class
You have an atom with 17 protons, 18 neutrons, a net charge -1, and a mass of 35. How many electrons does this atom have?
Answer:
this atom have 18 electronsExplanation:
we know that in nutral state of atom , an atom have equal number of protons and electrons ,but in this question this atom is not nutral means it is charged this atom have -1 charge this means it gains 1 electron .in nutral state if an atom have equal number of proton and electron when the atom is charged(gain or lost certain amount of electron) number of electron become proton -the electron it losts or proton + the electron it gainsthis atom have -1 charge this means it gains 1 electron so the number of electron calculated by ; proton + the number of electron it gains; this atom have 17 protons so , number of electron =17+1=18there fore this atom have 18 electrons. I think its helpful for youHi. Please tell me When you test starch with Barfoed’s reagent, what would be the answer, positive or negative? Explain the answer by giving reasons and structures.
What is the formula to calculate heat energy required to raise the temperature of any substance?
Answer:
[tex]\huge \dag \sf{Specific \: Heat}[/tex]
Specific Heat is the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree.Specific heat is a characteristic property that measures how much energy it takes to raise the temperature 1 gram of a material 1°C.
[tex]\huge\bold\red{Formula}[/tex]
mass x specific heat x change of temperature
Or,
c = Q / (mΔT)
[tex]\Large\textsf{Hope \: It \: Helped}[/tex]
[tex]{\blue{Formula}}[/tex]
The formula for specific heat is the amount of heat absorbed or released = mass x specific heat x change in temperature.
[tex]{\green{explanation}}[/tex]
Specific heat is the amount of heat required to raise one gram of any substance one degree Celsius or Kelvin.
What are the law of 10 in energy Transfer
Answer:
When the energy is passed on from one trophic level to another, only 10 percent of the energy is passed on to the next trophic level.
Explanation:
How do ionic bonds differ from covalent bonds?
Select the correct answer.
What are the products in the following chemical reaction?
Pb(NO3)2 + KCl
It is important to understand that while the absorbance value is related to the amount of light absorbed by a sample, it is not equal to or directly proportional to the amount of light absorbed. Consider a situation where 100 photons of light pass through a sample. After the light passes through the sample, 64 photons are detected. a) How many photons were transmitted through the sample
When 100 photons of light pass through a sample and 64 photons are detected after the passage of light, the number of photons transmitted through the sample is 64.
This is based on the methods of calculating the absorbance of light, which is depicted as the higher the amount of light transmission, the lower the amount of light absorbed.
Thus, when 64 photons of light in 100 photons are detected, 64 photons are transmitted, and therefore, the number of photons absorbed is 36.
Hence, hypothetically, if 100 photons of light are transmitted, 0 photons of light will be absorbed.
Therefore, in this case, it is concluded that the correct answer is 64 photos.
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help please ill do anything really!!!!!!!
Answer:
The first one is air the second is decreases the third is water the fourth is gas and the last is liquid.
Explanation:
Hope it helps.
A blank is formed or separated by physical processes.
When ice turns into a liquid, this is a __1__ change because __2__.
Answer:
1.physical change because the ice from a solidform cahnged into a liquid form
adjoa's gross salary for last month was ghs 4687.24. if ghs 421.78 was deducted from adjoa's salary pay,how much take home pay did adjoa earned this past month?
Since Ghs. 421.78 was deducted from Adjoa's salary pay, her take home pay is Ghs. 4265.46.
Given the following data:
Adjoa's gross salary = Ghs. 4687.24.Deduction = Ghs. 421.78Gross profit can be defined as the profit earned by a business after subtracting its cost of manufacturing and distributing goods from its total revenue (sales).
On a related note, gross salary is the amount of money earned by an individual before any deduction such as tax.
To find how much take home pay Adjoa earned this past month:
[tex]Take\;home = Gross\;salary - deduction\\\\Take\;home = 4687.24 - 421.78[/tex]
Take home = Ghs. 4265.46.
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How did max planck contribute to the modern atomic theory?
Answer:
Planck made many contributions to theoretical physics, but his fame rests primarily on his role as originator of the quantum theory. This theory revolutionized our understanding of atomic and subatomic processes, just as Albert Einstein's theory of relativity revolutionized our understanding of space and time
Answer:
revolutionized our understanding of atomic and subatomic processed
On the 14 point pH scale, soaps and cleaning solutions are typically -
Question 7 options:
0-6
8-14
7
Answer:The answer is 8-14
Explanation:It can range from 9-10 or
or above to 14 depending on the amount of leached wood ash(lye) a.k.a potassium carbonate which is an alkalline compound
Answer:
8-14
Explanation:
Can someone please help me answer this
Answer:
yiur mom
Explanation:
d
Vitamin D is produced in the skin when 7-dehydrocholesterol reacts with UVB rays (ultraviolet B) having wavelengths between
270 nm and 300 nm. What is the energy range Emin < E< Emax of the UVB photons?
The energy range expected is 6.6 × 10^-19 J < E < 7.33 × 10^-19 J
The energy of the photon is given by;
E = hc/λ
E = energy of the photon
h = Plank's constant
c = speed of light
λ = wavelength of light
For the upper boundary range;
E = ?
h = 6.6 × 10^-34 Js
c = 3 × 10^8 m/s
λ = 270 × 10^-9
E = 6.6 × 10^-34 Js × 3 × 10^8 m/s / 270 × 10^-9
E = 7.33 × 10^-19 J
For the lower range;
E = ?
h = 6.6 × 10^-34 Js
c = 3 × 10^8 m/s
λ =300 × 10^-9
E = 6.6 × 10^-34 Js × 3 × 10^8 m/s / 300 × 10^-9
E = 6.6 × 10^-19 J
Hence, the energy range 6.6 × 10^-19 J < E < 7.33 × 10^-19 J
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A student sets up a titration apparatus with 25 mL of potassium. hydroxide in the flask. In three to five sentences, explain how the student can use a 0.1 M solution of hydrobromic acid to determine the concentration of potassium hydroxide in the reaction.
The concentration of 25 mL of potassium hydroxide can be determined from 0.1 M solution of hydrobromic acid by titration.
Titration involves the process by which the concentration of an unknown solution is determined by reaction a known volume of the unknown solution with a carefully measured volume of a standard solution. By determining the volume of the standard solution required to react completely with the solution of unknown concentration, its concentration can be accurately determined by calculation.
In order to determine the concentration of 25 mL of potassium hydroxide, this volume of solution is put into a conical flask and titrated against a known volume of 0.1 M solution of hydrobromic acid. At the end point, usually signified by a color change, the concentration of the 25 mL of potassium hydroxide solution can be calculated from the stoichiometry of the reaction.
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The vapor pressure of a liquid at a given temperature is measured when the rate of evaporation of a liquid becomes
Answer:
the liquid becomes equal to the rate of condensation
Explanation:
ive come across this question before! and i think its right! :D
The vapor pressure of a liquid at a provided temperature is measured when the rate of evaporation of a liquid evolves equally to the rate of condensation.
What is Evaporation?
Evaporation is the procedure by which water transforms from a liquid to a gas or vapor.
Evaporation is the primary route that water moves from the liquid circumstances around into the water cycle as atmospheric water vapor.
When a molecule around the surface absorbs adequate energy to overwhelm the vapor pressure, it will exit and join the surrounding air as a gas.
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How many molecules of NaCl are there per mL of the solution?
Explanation:
Nacl is an ionic compound, so there are no molecules only formula units please mark me brainlist
A 623 ml sample of gas at STP is allowed to expand (like the universe) until it
occupies a volume of 1200 ml, What temperature would be needed to return the
gas to standard pressure? (all trying to find some equilibrium)
P
T
V
Initial latm
623
Final
loton
Effect
고
212
Yoo
&
a. What variables are constant? (NOT CHANGING!)