The most likely reason why the potato chunks gained mass is that water entered the potato cells.
How does water enter potato cells?The process of Osmosis allows water to pass through the semi-permeable membrane of potato cells.
This happens when the potato cells have less water than the material around them which then leads to water entering the cells to balance the water concentration.
The potato cells will expand and have more mass as a result.
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60 ml of a 1.0 m solution of h2so4 is mixed with distilled water to make 1 l of solution. what is the molarity
Answer:
0.057 M
Explanation:
To find the new molarity, you need to (1) find the moles (via the molarity equation using the old molarity and volume) and then (2) calculate the new molarity (via the molarity equation using the combined volume and old moles).
(Step 1)
60 mL / 1,000 = 0.06 L
Molarity (M) = moles / volume (L)
1.0 M = moles / 0.06 L
(1.0 M) x (0.06 L) = moles
0.06 = moles
(Step 2)
0.06 L + 1 L = 1.06 L
Molarity (M) = moles / volume (L)
Molarity = 0.06 moles / 1.06 L
Molarity = 0.057 M
The integrating center for the negative feedback loop that regulates body temperature is the.
Answer: Hypothalamus
Explanation:
The hypothalamus controls body temperature by sending signals to muscles, organs, glands, and other components of the nervous system when it becomes too low or too high. These structures then help in returning the body temperature to normal.
Phase change involves changing states of matter (solid-liquid-gas). How do these three states of matter differ from each other? (on a molecular level)
solid : the molecules are tightly packed
liquid : the molecules have some space in them
gas : molecules can freely move around
An ice cube absorbs 353 cal of
energy from its surroundings.
How many joules of energy is
this?
Answer:
1482.6 J
Explanation:
353 cal * 4.2 J / 1 cal = 1482.6 J
An ice cube absorbs 353 cal of energy from its surroundings. Number of joules of energy is 1482.6 Joules.
What is Energy?The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.
Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.
Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.
1 calorie of energy has 4.2 Joules.
Given, 353 Calories of Energy
Hence, 353 Calories of Energy has 1482.6 Joules.
Therefore, An ice cube absorbs 353 cal of energy from its surroundings. Number of joules of energy is 1482.6 Joules.
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Which feature of a balanced chemical equation demonstrates the law of conservation of mass?
Answer:
A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow.
2. The table below shows the atomic numbers of elements of the periodic table represented by letters I to Q The letters are not the actual chemical symbols for the elements. Element J Atomic number www I 且 } T H 3 Lithiur K 7 Witrogen 8 Select two elements which belong ta Olygin The same period of the periodic table Jk The same group of the period table. Select the element which: twitt form a divalent andon Reacts murst vigorously with water. 9 N Home 10 (Ink (1mk bºr (Ink 12 May Nashy 13 Aluminian C 14 St Veer
Explanation:
cudhdbsieehe eirbruwnee8ebeuw eodjsuww8
Oxygen forms a number of compounds with sulfur, many of which are quite reactive. One such compound is 57.20 % by mass S . Calculate the number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S . g O
The number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S = 29.9g of oxygen
Calculation of quantity of OxygenThe compound contains the following:
sulphur = 57.20%
Oxygen= 100 - 57.20 = 42.80%
If 57.20% of the sample contains 40g of sulphur then 42.80% of the sample will contain X.
Make X the subject of formula,
X = 42.8 × 40/57.20
X= 1712/57.20
X= 29.9g of oxygen
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How many grams of butane were in 1. 000 atm of gas at room temperature?
The mass in grams of butane at standard room temperature is 53.21 grams.
How can we determine the mass of an organic substance at room temperature?The gram of an organic substance at room temperature can be determined by using the ideal gas equation which can be expressed as:
PV = nRT
1 × 22.4 L = n × (0.0821 atm*L/mol*K× 298 K)
n = 22.4/24.4658 moles
n = 0.91556 moles
Recall that:
number of moles = mass(in grams)/molar massmass of butane = 0.91556 moles × 58.12 g/mole
mass of butane = 53.21 grams
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the law of definite proportions was first stated by
a. lavoisier
b. galileo
c. proust
d. dalton
Answer:
C.proust
Explanation:
Proust's law of definite proportions.
The law of definite proportions was first put forward by the French chemist Joseph Louis Proust in 1779. The discovery that mass was always conserved in chemical reactions was soon followed by the law of definite proportions, which states that a given chemical compound always contains the same elements in the same proportions by mass.
The law of constant proportions is often referred to as Proust’s law of definite proportions.For example, in a nitrogen dioxide (NO2 ) molecule, the ratio of the number of nitrogen and oxygen atoms is 1:2, but the mass ratio is 14:32 (or 7:16).For example, pure water will always contain hydrogen and oxygen in a fixed mass ratio (a gram of water consists of approximately 0.11 grams of hydrogen and 0.88 grams of oxygen, the ratio is 1:8).━━━━━━━━━━━━━━━━━━━━━
The bright-line emission spectrum of an element can best be explained by.
The light emitted by an element when its electrons return to a lower energy state can be viewed as a bright line emission spectrum.
What is Emission spectrum ?The distribution of electromagnetic radiation released by a substance whose atoms have been excited by heat or radiation.
A spectroscope can be used to determine which frequencies have been emitted by a substance.
An emission line will appear in a spectrum if the source emits specific wavelengths of radiation.
This emission occurs when an atom, element or molecule in an excited state returns to a configuration of lower energy.
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A 609 ml sample of naoh has a ph of 13.5292. if 594 ml of distilled water was added to the initial naoh solution, what would the new ph of the solution be g
The new pH of the solution after the addition of water would be 13.22.
Total volume of the solutionV(total) = 609 ml + 594 ml
V(total) = 1203 ml
Concentration of waterC = (594 ml)/(1203 ml)
C = 0.493
pOH = -log(0.493)
pOH = 0.31
New pH of the solution = 13.5292 - 0.31 = 13.22
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What is the theoretical yield of NaBr
when 2.36 moles of FeBr3 reacts?
2FeBr3 + 3Na2S → Fе₂S3 + 6NaBr
[?] mol NaBr
Round your answer to the hundredths place
The theoretical yield of NaBr given that 2.36 moles of FeBr₃ reacts is 7.08 moles
Balanced equation2FeBr₃ + 3Na₂S → Fе₂S₃ + 6NaBr
From the balanced equation above,
2 moles FeBr₃ reacted to produce 6 moles of NaBr
How to determine the theoretical yield of NaBrFrom the balanced equation above,
2 moles FeBr₃ reacted to produce 6 moles of NaBr
Therefore,
2.36 moles FeBr₃ will react to produce = (2.36 × 6) / 2 = 7.08 moles of NaBr
Therefore,
Thus, the theoretical yield of NaBr is 7.08 moles
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Answer:
7.08
Explanation:
If you added the same amount of sugar to the same amount of water and boiled it, what would the boiling point be?
Answer:
Adding sugar to water will raise the boiling point and decrease the freezing point of water.
Explanation:
Hope this helps!
If same amount of sugar added to the same amount of water and boiled it then boiling point increases.
When sugar added to water it become solution.
Example: If water boils at 100°C then solution with 80% sugar in 20% of water boils at 112°C.
Why boiling point of solution of sugar and water is higher then boiling point of water?Since, sugar is non-volatile solute. So, when we boil the solution of sugar in water then water boils easily in low temperature but more high temperature is required to boil sugar.
What is non-volatile solute?The solute which has higher vapor pressure as compare to solution in which it dissolve is called non-volatile solute.
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What is produced during the replacement reaction of ba(no3)2 and na2so4? 2bana 2no3so4 2nano3 baso4 nano3 baso4 bana2 (no3)2so4
2NaNO3(aq) + BaSO4 = Ba(NO3)2(aq) + Na2SO4(aq) (s)
Procedures involved:
The cations or anions may transfer positions in this twofold replacement/displacement reaction, which results in AB + CD AD + CB. In such a reaction, water, an insoluble gas, or an insoluble solid must be one of the byproducts (precipitate). The reaction in question has the following molecular equation:
2NaNO3(aq) + BaSO4 = Ba(NO3)2(aq) + Na2SO4(aq) (s)
Double displacement:
When two atoms or groups of atoms swap positions, a double displacement reaction occurs, creating new compounds. Typically, aqueous solutions are where it happens.
Na2SO4 + BaCl2 BaSO4 + 2NaCl is an example of a double displacement reaction.
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Given the balanced equation representing a
reaction:
2H₂ + O₂ → 2H₂O + energy
4. Which mass of oxygen completely reacts with
4.0 grams of hydrogen to produce 36.0 grams of
water?
(1) 8.0 g
(2) 16.0 g
(3) 32.0 g
(4) 40.0 g
Answer: it would be number 3, 32.0g
How many moles of propane
react when 294 g of CO2 form?
C3H8 +502 3CO2 + 4H₂O
?] mol C3H8
Considering the combustion reaction of propane again, what mass of propane (C3Hg) is necessary to react with 4.53 g of oxygen? C3H8 +5023CO₂ + 4H₂O 0.0256 g C3H8 1.13 g C3H8 1.25 g C3H8 2.50 g C3H8
Answer:
1.25 g C3H8
Explanation:
edge lol
What happens if you keep thermometer in deep freezer? Why?
Answer:
Nothing will happen until you remove the thermometer.
Explanation:If the thermometer is made of mercury in glass, nothing will happen….mercury does not freeze at the temperatures in the refrigerator…
Determine if the following statement is true or false, and why. “A hypothesis can be proven true.”
A. False, it should read “A hypothesis can only be proven false.”
B. True
C. False, it should read “A hypothesis cannot be tested.”
D. False, it should read “A hypothesis can’t be proven true if it is falsifiable.”
it's true. answer is B.
a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.
but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.
a proven hypothesis (a true hypothesis)is the reason for theories.
Answer:
it's true. answer is B.
a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.
but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.
a proven hypothesis (a true hypothesis)is the reason for theories.
Explanation:
hope this helps :)
In photosynthesis, plants use energy from the sun to produce glucose, c6h12o6 , and oxygen from the reaction of carbon dioxide and water.
6co2 + 6h2o --> c6h12o6 + 6o2
what mass, in grams, of glucose is produced when 3.00 mol of water react with carbon dioxide?
Answer: 324 g (to 3 sf)
Explanation:
Based on the coefficients of the equation, we know that when 3.00 mol of water is consumed, 3.00 mol of carbon dioxide is also consumed.
The atomic mass of carbon is 12.011 g/mol.The atomic mass of oxygen is 15.9994 g/mol.Thus, the formula mass of carbon dioxide is:
[tex]6(15.9994)+12.011=108.0074[/tex] g/mol.
Thus, 3.00 mol has a mass of (108.0074)(3.00)=324 g (to 3 sf)
The energy of a photon from certain wavelength is 1.37 x 10^-20 j, what is the frequency in hz?
Answer:
frequency = 2.07 x 10¹³ Hz
Explanation:
To find the frequency of the photon, you need to use the following equation:
E = hv
In this formula,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)
-----> v = frequency (Hz)
Since you have been given values for two of the variables (in the correct units), you can plug them into the equation and simplify to find the frequency.
E = hv <----- General Equation
E = (6.626 x 10⁻³⁴ J*s)v <---- Plug in Planck's Constant
1.37 x 10⁻²⁰ J = (6.626 x 10⁻³⁴ J*s)v <----- Plug in energy (given)
2.07 x 10¹³ = v <----- Divide both sides by 6.626 x 10⁻³⁴
An electrolytic cell differs from a voltaic cell because.
Which of the following questions would be answered by performing a scientific experiment?
A.
What type of food is the most enjoyable?
B.
What type of food is the most nutritious?
C.
What type of food looks the best?
What is the volume in L of a 0.825 mole sample of Ar at 600 mm Hg and 300 K? Report your answer to the nearest tenth of a L. (Moodle is looking for a number only, no units.)
The volume is 2.608L
Given the value of n is 0.825 mole , pressure is 600mm = 0.789bar and Temperature = 300K
We need to calculate the volume in L
As we know the values of number of moles , pressure and Temperature is given
So , to calculate the volume we will use the ideal gas law
The equation of state for a fictitious perfect gas is known as the ideal gas law, sometimes known as the generic gas equation. Although it has several restrictions, it is a decent approximation of the behavior of numerous gases under various circumstances.
Ideal gas law formula
PV = nRT
0.789*V = 0.825*8.3143*300
V = 0.825*8.314*300/0.789
V = 2.608*10^3
V = 2.608 L
Hence the Volume is 2.608 L
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Which term describes this reaction?
Answer:
addition polymerization
Explanation:
How many grams of Ag2S2O3 form
when 125.0 g AgBr reacts completely
according to the reaction below?
2AgBr + Na2S2O3 → Ag2S₂O3 + 2NaBr
Taking into account the reaction stoichiometry, 109.09 grams of Ag₂S₂O₃ are formed when 125 g AgBr reacts completely.
Reaction stoichiometryIn first place, the balanced reaction is:
2 AgBr + Na₂S₂O₃ → Ag₂S₂O₃ + 2 NaBr
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
AgBr: 2 moles Na₂S₂O₃: 1 moleAg₂S₂O₃: 1 mole NaBr: 2 molesThe molar mass of the compounds is:
AgBr: 187.77 g/moleNa₂S₂O₃: 158 g/moleAg₂S₂O₃: 327.74 g/moleNaBr: 102.9 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
AgBr: 2 moles ×187.77 g/mole= 375.54 gramsNa₂S₂O₃: 1 mole ×158 g/mole= 158 gramsAg₂S₂O₃: 1 mole ×327.74 g/mole= 327.74 gramsNaBr: 2 moles ×102.9 g/mole= 205.8 gramsMass of Ag₂S₂O₃ formedThe following rule of three can be applied: if by reaction stoichiometry 375.54 grams of AgBr form 327.74 grams of Ag₂S₂O₃, 125 grams of AgBr form how much mass of Ag₂S₂O₃?
[tex]mass of Ag_{2} S_{2} O_{3} =\frac{125 grams of AgBrx327.74 grams of Ag_{2} S_{2} O_{3}}{375.54 grams of AgBr}[/tex]
mass of Ag₂S₂O₃= 109.09 grams
Then, 109.09 grams of Ag₂S₂O₃ are formed when 125 g AgBr reacts completely.
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A is a solution containing 3.5g of HX per dm-³. B is a solution containing 0.050moldm-³ of an hydrous sodium trioxocarbonate (IV) of solution 25cm³ portions of solution B required an average of 26.10cm³ of Solution A for complete neutralization. From this results, calculate
1. The Molar Concentration Of A
2. The Relative Molar Mass Of A
Equation For The Reaction 2HX + Na2CO3 ---> 2NaX + H2O + CO2
Brainliest!!
The Molar Concentration Of A =0.099 .
The Relative Molar Mass Of A = 35.0129 gm
Given,
Mass of HX = 3.5 g
Moles of solution B ([tex]Na_{2} CO_{3}[/tex]) = 0.05 moles
Volume of HX = 26.10 mL
Volume of Solution B = 25 mL
Molecular weight of solution B = 2(atomic weight of Na )+ atomic weight of C + 3(atomic weight of O)
= 2(23) + 12 + 3(16)
=106 gm
Equivalent weight of [tex]Na_{2} CO_{3}[/tex] = molecular weight / 2 = 106 /2 =53 g
Mole = mass / molecular weight
∴0.05 = mass / 106
∴ mass = 5.3 gm [tex]Na_{2} CO_{3}[/tex]
Normality = mass ÷ (equivalent weight × volume of the solution in liter)
= 5.3 ÷( 53 × 0.025)
=4 N
So, by using formula ,
[tex]N_{1} V_{1} =N_{2} V_{2}[/tex]
[tex]N_{1}[/tex] = normality of solution B = 4 N
[tex]V_{1}[/tex] = volume of solution B = 25 mL
[tex]N_{2}[/tex] = normality of solution A = ? N
[tex]V_{2}[/tex] =Volume of solution A = 26.1 mL
∴ 4×25 = [tex]N_{2}[/tex] × 26.1
∴[tex]N_{2}[/tex] = 3.83 N
∴ normality of solution A = 3.83 N
from Formula of the normality we can find the equivalent weight of the A
Normality = mass of HX ÷ (equivalent weight × volume of the solution in liter)
3.83 = 3.5 ÷( equivalent weight × 0.0261)
∴equivalent weight = 35.0129 g
In case of HX the electron transfer is 1 ,so equivalent weight = molecular weight ; which is also termed as relative molar mass in given case.
∴The Relative Molar Mass Of A = 35.0129 g
Molar concentration = mass / molar mass
= 3.5 / 35.0129
= 0.099 mole
∴ The Molar Concentration of A is 0.099 .
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How many miles of silver will be generated if 1.30 miles of zinc is placed into silver nitrate solution
2.60 moles.
Zn (s) + 2 Ag+ (aq) --> 2 Ag (s) + Zn2+ (aq), each mole of zinc gives out two moles of silver. Therefore, 1.30 moles of zinc will displace 2.60 moles of silver. ( 1.30 × 2)
More about silver nitrate:
An inorganic substance with the chemical formula AgNO3 is silver nitrate. This salt serves as a flexible base for numerous different silver compounds, including those employed in photography. Compared to halides, it is far less light-sensitive. Lunar caustic was previously the name given to it since early alchemists referred to silver as luna and connected it to the moon.
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What is the mass of the object on this triple beam balance?
A closer look at the triple beam balance shows that mass of the body is 52.5 g.
What is a triple beam balance?The term triple beam balance refers to an equipment that is used to determine the mass of an object. It has three different degrees of calibration as shown.
In this case, if we look at the beam balance well, we can see that the mass of the body is 52.5 g.
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Please help asap! giving brainliest to correct answer!!
which pair of compounds has the same empirical formula? (5 points)
select one:
a. c3h8 and c3h
b. c2h2 and c2h
c. c4h10 and c6h
d. c4h10 and c2h5
Answer:
D. C₄H₁₀ and C₂H₅
What is a empirical formula?
A chemical formula indicating the elements of a compound and their relative proportions, as (CH₂O)n.
Since an empirical formula indicates the ratio (proportions) of the elements in the compound, it can be used, along with the molar weight of the compound, to determine the molecular formula.
The empirical formula provides the smallest whole-number ratio among elements or compounds within a molecular compound. A compound is a chemical formed from atoms of different chemical elements.
Hence, Option D is correct.
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