Copper(II) sulfate is an example of a substance that dissolves in water. Copper(II) sulfate is an ionic compound with the chemical formula CuSO4 and when it is added to water it dissociates into Cu2+ and SO42− ions. Students used both copper sulfate crystals and copper sulfate powder in this experiment on the rate of dissolving. Choose one statement that represents a valid conclusion based on the student data?
A) The smaller the solute particles the more energy they have. Increased energy results in shorted dissolving time.
B) A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.
C) As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.
D) Agitation of the powder allows fresh solvent molecules to continually be in contact with the solute
Answers
As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.
Does increase in temperature make solids to dissolve faster?Increasing the temperature of a solvent can increase the rate at which a solid dissolves. This is because an increase in temperature causes the solvent molecules to move more rapidly, which in turn increases their kinetic energy and ability to interact with the solute particles.
As a result, the solute particles are more likely to break free from their crystal lattice and become surrounded by the solvent molecules.
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Answer:
A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.
Explanation:
The more surface area of a solute that is exposed, the faster the solute will dissolve. Like sugar for an example, sugar cubes take longer to dissolve as compared to regular ground up sugar.
And I took the test and got this right!
Related Questions
Which describes the burning of fossil fuels?
O A. The reaction is endothermic.
B. Greenhouse gases are released into the atmosphere.
O C. Turbines are used to heat the fuels.
D. Petroleum is formed because of the heating.
Answers
Answer:
B. Greenhouse gases are released into the atmosphere.
I learn it in my bio class
A scientist studied a population of gorillas in central africa for one year. during this time, four gorillas were born and one orphaned gorilla joined the group. two older gorillas died and three males left the population to find mates. the calculated population growth was , indicating that the population .
Answers
The calculated population growth was zero indicating that the population had not net change.
What is population?The term "population" refers to the number of people or species residing in a certain area.
According to the question:
Four gorillas were born and one orphaned gorilla joined = 4 + 1 = 5
Two older gorillas died and three males left the population to find mates = 5 - 2 - 3 = 0
The population increase of gorillas was calculated to be zero, meaning that there was no net change in the population.
Hence population had not net change.
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Answer:
The calculated population growth was ZERO, indicating that the population HAD NO NET CHANGE.
Explanation: Got it right! Good luck guys!
Which subshell holds the valence electrons of barium?.
Answers
Answer:
6s
Explanation:
Barium is in group 2 of the s block and is in period 6.
Barium belongs to the s block's period 6 and group 2. Barium is an alkaline earth metal with two valence electrons and a (+2) oxidation state found in Periodic Table Group 2.
How are the valence electrons located?Valence electrons are electrons in an atom's outermost shell, or energy level. For example, oxygen has six valence electrons, two of which are in the 2s subshell and four of which are in the 2p subshell. For neutral atoms, the number of valence electrons is the same as the number of the atom's main group. The column of a periodic table element can be used to determine its main group number. Carbon, for example, belongs to group 4 and has four valence electrons, which are the outermost (valence) shell electrons of an atom that can be shared or transferred to another element.To learn more about valence electrons refer to:
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Which of the following correctly identifies two of the eight elements of weather?
A. latitude and longitude
B. atmospheric pressure and visibility
C. dew point and ground temperature
D. condensation and saturation
Answers
Answer:
B. Atmospheric Pressure and Visibility
Explanation:
Latitude and Longitude are locations, not aspects of weather.
While dew point is an element, ground temperature is not measured.
Condensation regarding clouds might be measured but saturation more or less isn't. (Unless specifically humidity.
Atmospheric Pressure and Visibility are both elements of weather.
Which ion is formed when an atom of fluorine (f) gains one electron? f–1 f–2 f 1 f 2
Answers
Answer:
If a fluorine atom gains an electron, it becomes a fluoride ion with an electric charge of -1.
Explanation:
hope this helps
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Who is credited with arranging the periodic table?.
Answers
Answer
Dmitri Mendeleev Explanation:The modern periodic tables is credited primarily to the russian chemist Dmitri Mendeleev. Mendeleev's table is based on the periodic law, which states that when elements are arranged in order of increasing mass, their properties recur periodically.
what caused our solar system to form by pulling together gases and dust in a nebula?
Answers
Kindly answer it please
Answers
Answer:
See below ~
Explanation:
1. C. solid
2. B. tone quality
3. C. pitch
4. D. capable of producing its own light
5. D. stars
Answer:
1. C. solids
2. B. tone quality
3. A. pitch
4. D. capable of producing its own light
5. D. stars
A sample of gas initially occupies 3.50 L at a pressure of 795 torr at 32.0oC. What will the temperature be if the pressure is changed to 4.00 atm, and the volume is changed to 1.50 L
Answers
As the volume was decreased and pressure increased to the given values, the new temperature of the ideal gas is 226.9°C.
Combined gas lawCombined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.
It is expressed as;
P₁V₁/T₁ = P₂V₂/T₂
Given the data in the question;
Initial volume V₁ = 3.50LInitial pressure P₁ = 795torr = 1.04605atmInitial temperature T₁ = 32.0°C = 305.15KFinal volume V₂ = 1.50LFinal pressure P₂ = 4.00atmFinal temperature T₂ = ?To calculate the new temperature the gas, we subtsitute our given values into the expression above.
P₁V₁/T₁ = P₂V₂/T₂
P₁V₁T₂ = P₂V₂T₁
T₂ = P₂V₂T₁/P₁V₁
T₂ = ( 4.00atm × 1.50L × 305.15K ) / ( 1.04605atm × 3.50L )
T₂ = 1830.9LatmK / 3.661175Latm
T₂ = 500.085K
T₂ = 226.9°C
Therefore, as the volume was decreased and pressure increased to the given values, the new temperature of the ideal gas is 226.9°C.
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Harry uses a sling psychrometer to measure relative humidity near his school. The dry bulb temperature reads 58°F, and the wet bulb reads 45°F. At the same time, his cousin Roberta uses her sling psychrometer to measure the relative humidity near her house. The dry bulb temperature reads 58°F, and the wet bulb reads 50°F. What can you conclude from the values?
A.
The relative humidity is higher at Harry’s school than at Roberta’s house.
B.
The relative humidity is higher at Roberta’s house than at Harry’s school.
C.
The relative humidity is the same at Harry’s school and Roberta’s house.
D.
The relative humidity is 45% at Harry’s school and 50% at Roberta’s house.
Answers
Answer:
A.The relative humidity is higher at Harry’s school than at Roberta’s house.
Explanation:
Check using the Relative Humidity Table
Answer:
Option B) The relative humidity is higher at Roberta’s house than at Harry’s school.
Explanation:
got 100% on test
H3C•
O=(
c
•CH3 can interact with
other like molecules through
dispersion
forces, dipole-
only dispersion
only dispersion
forces and
dipole and
forces
dipole-dipole
hydrogen bonds
Please help me
Answers
Answer:
c
Explanation:
H3C•O=(c•CH3 can interact with other like molecules through only only dispersion forces and dipole dipole forces. option B is correct.
What are dipole dipole forces?The force of dipole dipole creates because of the presence of polar compounds and they are responsible for the polarization too and dispersion forces are weak molecular forces of interaction.
H3C•O=(c•CH3 is known as acetone and due to the presence of oxygen they form one polar bond due to the presence of lone pair on the oxygen atom and oxygen is the electronegative element too.
Acetone will form dispersion force as carbon and hydrogen are of similar electronegativities so they are bounded with dispersion force and not very polar.
Therefore, H3C•O=(c•CH3 can interact with other like molecules through only only dispersion forces and dipole dipole forces. option B is correct.
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in an ion, the number of electrons is _____ to the number of protons
Answers
Answer:
more/less depending on if it lost or gained electrons during the ionic bond process
__________ in carbon dioxide in your tissues leads to __________ in ph of cerebrospinal fluid and blood, which ultimately causes your breathing to speed up.
Answers
DISTURBANCE in carbon dioxide in your tissues leads to CHANGE in pH of cerebrospinal fluid and blood, which ultimately causes your breathing to speed up.
Effects of carbondioxide in the bodyThe carbondioxide in the tissues are transported in the blood from the bodily tissues to the lungs through binding to hemoglobin or as a bicarbonate ion. the disturbance of CO₂ in the tissues will lead to a change in the pH level of the cerebrospinal fluid which leads to an increase in breathing speed.
Hence we can conclude that Disturbance in carbon dioxide in your tissues leads to Change in pH of cerebrospinal fluid and blood, which ultimately causes your breathing to speed up.
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NEED HELP PLEASE HURRY
Which of the following are decomposition reactions? Select all that apply.
H2CO3 -> CO2 + H2O
CaCO3 -> CaO + CO2
2H2O -> 2H2 + O2
3Mg + N2 -> Mg3N2
2NaCl -> 2Na + Cl2
Answers
Answer:
I believe it would be the last 2
Explanation:
the 4th one is magnesium and something else but that's with decomposition and so is the last one. the first three has water and oxygen and stuff that doesn't rly do decomposition
Because they have alternating double and single bonds, the nitrogenous bases found in nucleic acids exist as two different structural forms in solution. The different structural forms are called
Answers
The both sturctures of the nucleic acid are called resonance structures.
What are resonance structures?Resonance structures refers to those structures that differ from each other by the position of electron pairs. We must state that resonsnce occurs in spsecies that have conjugated double bonds.
Hence, the both sturctures of the nucleic acid are called resonance structures.
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how can people affect the water cycle in a good way
Answers
Answer:
damming rivers for hydroelectricity, using water for farming, deforestation and the burning of fossil fuels.
Explanation:
A current of 15.0 A is passed through molten magnesium chloride for 15.0 hours. How many moles of magnesium metal could be produced via this electrolysis
Answers
For a current of 15.0 A is passed through molten magnesium chloride for 15.0 hours, the amount of moles of magnesium metal is mathematically given as
M=4.2mole
What is the amount of moles of magnesium metal that could be produced via this electrolysis?Generally, the equation for the Chemical reaction is mathematically given as
Mg+2e---->Mg
Therefore
Charge=Currect*time
Q=15*5*4.0*10^4
Q=8.10*10^5C
In conclusion, the number of moles
8.10*10^5C*1M/(2*96500)
M=4.2mole
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While a certain isotope decays, it emits photons. what kind of decay is happening? alpha decay beta decay gamma decay positron decay
Answers
Answer:
gamma decay.
Explanation:
A gamma decay emits only a gamma-ray photon,
While a certain isotope decays, it emits photons.It is a type of gamma decay.
What are isotopes?
Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.
Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.
They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable
Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .
Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.
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If 4.5 moles of H2O are produced how many moles of citric acid were used in this reaction
Answers
Answer:
Explanation:
Question
If 4.5 moles of H2O are produced how many moles of citric acid were used in this reaction
Please help, I’ll mark your answer as brainliest
Answers
Answer:
5.16 gm of SO3 formed with 2 g of S
Explanation:
Mole weight of S in the equation = 2 * 32 = 62 gm
Mole weight os O2 in the equation 6 * 16 =96 gm
From the BALANCED equation the grams of S to O2 is
62 to 96 so 2 g of S will need approx 3 gm of O2
this shows that S is the limiting reactant------>
there will be O left over (approx 1 gram)
SO3 mole weight produced from the equation is 2 (32)(3*16) = 160 gm
62 gm of S produces 160 gm of SO3
62/160 = 2 / x x = 5.16 gm of SO3 are formed
Hi!! Please help in any way you can, I’ll give all of the points I have for it ^^
(Showing work is sadly required + needs to include units)
Answers
The reactions involved are synthesis, combustion and single replacement reactions and the masses of products formed are dependent on the mole ratio.
What are limiting reactants?Limiting reactants are reactants are reactants that are used in a chemical reaction.
The equation for the production of water is given below:
[tex]2H_2 + O_2 \rightarrow 2H_2O[/tex]
The reaction is a synthesis reaction and the mole ratio of hydrogen to oxygen is 2 : 1.
Moles of 250 g of Hydrogen = 250/2 = 125 moles
Moles of water produced = 125 moles
Mass of water = 125 × 18 = 2250 g
Moles of oxygen in 250 g = 250/32 = 7.81 moles
Moles of water produced = 7.81 × 2 = 15.62
Mass of water produced = 15.62 × 18 = 281.16 g
Since moles of oxygen use is less than the mole ratio of reaction, oxygen is the limiting reactant.
2. The reaction of propane and oxygen is a combustion reaction and is given below:
[tex]C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O[/tex]
1 mole of propane produces 4 moles of water
44 g of propane produces 72 g of water
Mass of propane required to produce 1000 g of water = 1000 × 44/ 72 = 611.1 g of propane
3. The reaction of zinc and hydrochloride acid is a single replacement reaction and the equation is given below:
[tex]Zn + 2HCl \rightarrow ZnCl_2 + H_2[/tex]
1 mole of Zn and 2 moles of HCl are required to produce 1 mole of hydrogen gas
Molar mass of Zn = 65 g
Molar mass of HCl = 36.5
Molar mass of hydrogen = 2.0 g
150 g of Hydrogen gas = 150/2 = 75 moles of hydrogen
Mass of 75 moles of Zn = 75 × 65 = 4875 g
mass of 75 × 2 moles if HCl = 150 × 36.5 =5475 g
Therefore, 4875 g of Zn and 5475 g of HCl are required to produce 150 g of Hydrogen gas.
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Help please : The amount of energy needed to heat 5. 3 g of a substance from 50. 0°C to 80. 0°C is 10. 4 J. What is the specific heat capacity of this sample?
Answers
Answer: 0.065
Explanation:
what is the numbe of atoms in oxygen?
Answers
Answer:
Two atoms (O2)
Explanation:
Atmospheric oxygen molecule has 2 atoms, which can be easily seen from the oxygen symbol - O2. Here, the molecule has two atoms of oxygen.
The molecular formula and molar mass of two straight-chain hydrocarbons are listed in the table above. Based on the information in the table, which compound has the higher boiling point, and why is that compound’s boiling point higher?
Answers
Answer:
~Shoto todorki here~
The following table illustrates some of the factors that influence the strength of intermolecular attractions. The formula of each entry is followed by its formula weight in parentheses and the boiling point in degrees Celsius. First there is molecular size. Large molecules have more electrons and nuclei that create van der Waals attractive forces, so their compounds usually have higher boiling points than similar compounds made up of smaller molecules. It is very important to apply this rule only to like compounds. (Hope this helps!)
What is the name for this molecule? a skeletal model of an 8-carbon zig zag chain. there is a double bond between the first and second carbons. nonene nonane 1-octyne 1-octene
Answers
The name of the compound by using the IUPAC nomenclature of organic compounds is 1 -octene. The correct option is the last option - 1-octene.
Nomenclature of Organic compoundsFrom the question, we are to determine the name of the given molecule.
To name the compound, we will follow the IUPAC rules.
Some of IUPAC rules are
Find the longest continuous carbon chain. Determine the root name for this parent chain.For Alkenes (organic compounds with double bond), number the chain of carbons that includes the C=C so that the C=C has the lower position number. Change “ane” to “ene” and assign a position number to the first carbon of the C=C.The given compound has 8 carbons and a double bond. The root name of the compound is octane.
By IUPAC rules, the compound is an Octene.
Since the double bond is between carbon-1 and carbon-2. The compound becomes 1-octene.
Hence, the name of the compound by using the IUPAC nomenclature of organic compounds is 1 -octene. The correct option is the last option - 1-octene.
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The diagram for the compound is attached below.
A volume of 26.5 mL of nitrogen gas was collected in a tube at a temperature of 17°C and a pressure of 737 mm Hg. The next day the volume of the nitrogen was 27.1 mL with the barometer still reading 737 mm Hg. What was the temperature on the second day?
Answers
T2 = 296.6 K
The final temperature of the nitrogen gas is equal to 23.5 °C.
What is the ideal gas equation?The ideal gas equation describes the behavior of the state of a perfect gas. This equation defined that the product of the pressure and volume is equal to the product of the moles and absolute temperature of the gas.
The ideal gas equation can be expressed as shown below:
PV = nRT
Where n is the moles, V is the volume, R is the gas constant and T is the temperature.
Given, the temperature of nitrogen gas, T₁ = 17° C = 273 + 17 = 290 K
The pressure of the nitrogen gas, P₁ = 737 mmHg = 1.03 atm
The volume of the gas, V₁ = 26.5 ml = 0.0265 L
The pressure of the nitrogen gas, P₂ = 737 mmHg = 1.03 atm
The volume of the gas, V₂ = 27.1 ml = 0.0271 L
(P₁V₁)/T₁ = (P₂V₂)/T₂
[tex]{\displaystyle T_2 =\frac{P_2V_2T_1}{P_1V_1}[/tex]
[tex]{\displaystyle T_2 =\frac{1.03\times 0.0271\times290}{1.03\times 0.0265}[/tex]
T₂ = 296.5 K
T₂ = 296.5 -273 = 23.5 °C
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Given that [OH-] = 5.46x10^-9M
find the [H3O+] and state whether the solution is acidic or not and why?
Answers
pH:-
14-pOH14-8.265.74It's acidic as pH<7
Now
-log[H+]=5.74log[H+]=-5.74H+=10^{-5.74}H+=1.81×10^-6M1. An acid will have the suffix “–ic acid” at the end of its name when the negative
ion has a suffix_______ . For example, “hydrogen carbonate (H2CO3)” is called “carbonic acid”.
2. An acid will have the suffix “–ous acid” at the end of its name when the negative
ion has a suffix________ . For example, “hydrogen sulphite (H2SO3)” is called “sulphurous acid.”
Answers
This is defined as a chemical substance which can react with a base to form a salt in a reaction.
The appropriate acid suffixes and conditions is however correctly given above.
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What is the pH of a 0.0340 M HCl solution?
Answers
Answer:
HCl → H+ + Cl-
pH = -log[H+] = 1.469
Explanation:
Strong acid doesn't establish equilibrium. To determine the pH of a strong acid, the concentration of the acid is equal to the concentration of the hydrogen ion, so take the -log[H+], which will give you the pH. And you can see that it is a small number, and that's because HCl is a strong acid.
The pH of a solution can be calculated using the equation: pH = -log[H+]
What is pH?pH is a measure of the acidity or alkalinity of a solution. It is a scale that ranges from 0 to 14, with 7 being considered neutral. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity.
In this case, the HCl solution has a concentration of 0.0340 M, which represents the concentration of H+ ions. Since HCl is a strong acid, it completely dissociates in water, yielding one H+ ion for every HCl molecule.
Therefore, the concentration of H+ ions is equal to the concentration of the HCl solution, which is 0.0340 M.
Taking the negative logarithm of 0.0340, we have:
pH = -log(0.0340)
Using a calculator, we find that the pH of the 0.0340 M HCl solution is approximately 1.47.
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What are two ways in which fresh water lakes and streams can become acidic?.
Answers
Answer:
1.By reduction of acidified anions.
2.By weathering of rocks.
Explanation:
Answer:
2 or can be by reduction of acid anions