When the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
What is specific heat capacity?Specific heat capacity is the quantity of heat required to raise a unit mass of a substance by 1 kelvin.
Specific heat capacity of water and sandWater, c = 4,200 J/kg⁰C
Sand, c = 830 J/kg⁰C
Q = mcΔθ
where;
Δθ is temperature changeQ is quantity of heat addedΔθ = Q/mc
Thus, for an equal mass of water and sand, when the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
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Answer:t
Explanation:
7. How does deforestation increase the level of carbon dioxide in the atmosphere? (Select all that apply.)
increasing ozone in the atmosphere by decreasing the rate of photosynthesis
decreasing the rate of photosynthesis by removing trees
Smoke from tree-clearing equipment adds large amounts of carbon dioxide to the atmosphere.
burning trees, releasing more carbon dioxide into the atmosphere
Deforestation increases the level of carbon dioxide in the atmosphere by decreasing the rate of photosynthesis (i.e., by removing trees).
What is deforestation?Deforestation refers to the removal of trees in a given ecosystem (e.g. a particular forest biome).
Thus practice (deforestation) is well known to increase the levels of carbon dioxide and global warming.
In conclusion, deforestation increases the level of carbon dioxide in the atmosphere by decreasing the rate of photosynthesis (i.e., by removing trees).
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In a calorimeter, a 1.0 g sample of magnesium is burned to form mgo. in doing so, 25.5 kj of energy are released. what is the molar enthalpy of combustion in kj/mol of magnesium?
question 2 options:
0.6324
1.54 x 1025
0.0392
620
25.5
The molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol, Option D is the correct answer.
What is enthalpy of Combustion ?The energy released when a fuel is oxidized by an oxidizing agent is called enthalpy of Combustion.
It is given that
a 1.0 g sample of magnesium is burned to form MgO. in doing so, 25.5 kj of energy are released.
Molecular weight of Magnesium = 24.35g
24.35 g makes 1 mole of Mg
1g = 1/24.35
For 0.04 moles 25.5 kJ is released
for 1 mole 25.5 *1/.04
= 620 kj/mol
Therefore the molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol.
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What is the concentration of hydronium and hydroxide ions in pure water at 25°c.
Explanation:
The concentration of hydronium and hydroxide ions are equal in pure water at 25 degree Celsius. Bringing the pH of pure water to be 7.a person who eats three servings of the cereal without milk will consume__ calories__ grams of carbohydrates
A person who eats three servings of the cereal without milk will consume about 117 percent of calories.
What is Calorie?This is defined as a unit of energy and is commonly used in the body system.
One serving of cereal without milk will contain 39 percent of calories while three servings will be 117 percent.
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the conductance of the electric current through the electrolytic solution increases with
a)decrease in dilution
b)increase in dilution
c)increase in concentration
d)low degree of ionization
The conductance of the electric current through the electrolytic solution increases with increase in concentration.
What is electrolysis?The term electrolysis has to do with a situation in which liquids conduct electricity by the movement of ions.
The conductivity of the solution depends on the ions present in the solution. Thus, the conductance of the electric current through the electrolytic solution increases with increase in concentration.
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In which stage do vertebrate embryos or offspring show the most similarities?
Answer:
All developing vertebrates appear very similar shortly after gastrulation. It is only later in development that the special features of class, order, and finally species emerge. All vertebrate embryos have gill arches, notochords, spinal cords, and primitive kidneys
Explanation:
I hope this helps you! :)
Objects with potential energy got that energy:
A. Entirely from their height above the earth.
B. After work was performed on them.
C. When kinetic energy was released from fossil fuels.
D. Through electromagnetic discharges.
Answer:
D. Through electromagnetic discharges.
Explanation:
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Ammonium hydroxide, (NH4OH), is considered a weak base because...
Select one:
a. it produces few hydroxide ions in aqueous solution.
b. it produces few hydrogen ions in aqueous solution.
c. it does not conduct electricity in aqueous solution.
d. it will not take part in a neutralization reaction.
Ammonium hydroxide is considered a weak base because it produces few hydroxide ions in aqueous solution. (Option a)
Strength of electrolytesStrong electrolytes: are completely ionized in aqueous solution.Weak electrolytes: are partially ionized in aqueous solution.Let's consider the ionization of ammonium hydroxide, which is a weak base.
NH₄OH ⇄ NH₄⁺ + OH⁻
Why is it considered a weak base?
a. it produces few hydroxide ions in aqueous solution. Yes, since it dissociates partially.
b. it produces few hydrogen ions in aqueous solution. No, since it does not produce hydrogen ions.
c. it does not conduct electricity in aqueous solution. No, since it conducts electricity, although poorly.
d. it will not take part in a neutralization reaction. No, since it will be neutralized by acids.
Ammonium hydroxide is considered a weak base because it produces few hydroxide ions in aqueous solution.
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Having problems figuring out molar mass in general. steps would be most appreciated.
Answer:
The periodic table
Explanation:
As you can see in the screenshot. Each element on the periodic table has an atomic number and a mass number. The atomic numbers are arranged in numerical order from right to left in the periodic table. The second number there is the atomic mass.
When doing stoichiometric ratios, you need to use the atomic mass of each element to determine the molecular/molar mass.
example. Find the molar mass of
H₂SO₄
Hydrogen (2) + sulphur (1) +oxygen (4)
= atomic mass of H(2)+ atomic mass S(1)+ atomic mass oxygen(4)
=1(2) + 32(1)+16(4)
=2+32+64
=98
N.B We do not use the co-efficient when looking for molar mass, we only use the atom and subscript
Which description best describes n in the ideal gas law equation? *
How hard the particles are pushing on something
How many particles of something there is
How hot/cold something is
How much space something takes up
8.3145 L kPa / K mol
Answer:
How Hot Or cold it is is how it may be perceived
Emma rubs suntan lotion into her hands. At first her hands stay cool. After the cream is absorbed, her skin begins to get warm. Why do her hands stay cool while there is suntan lotion between them
Explanation:Suntan lotion basically evaporates. Sun tan lotion contains a chemical called acetone. So when the sun tan lotion is appilied, her hands feel cool, and as when it evporates in air it becomes warm again.
Additional information: Acetone is also found in Nailpolish remover, medicinal balms, sanitzers etc.
Project: modeling nuclear changes on edge
assignment summary:
in this project, you will create models of various atomic nuclei and how they change during radioactive
decay, fission, or fusion. first, you will complete a table that summarizes how the structure of the nuclei
changes during each of these processes. this will help you plan your models.
In designing models of nuclear changes, the models of nuclei in nuclear fission becomes smaller while that in nuclear fusion becomes larger after the reaction.
What are nuclear fission and fusion reactions?Nuclear fission is a type of nuclear reaction in which The nucleus of larger atoms splits into two or more smaller nuclei of atoms of elements.
Nuclear fusion is a type of nuclear reaction in which The nucleus of two smaller atoms fuse to produce nuclei of a larger atom.
Therefore, in the models of nuclear reactions, the models in nuclear fission becomes smaller while that in nuclear fusion becomes larger.
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Answer:
hope this works for u!!!!!!
Explanation:
What is the missing word in this word equation? acid + alkali → __________ + water
⇒Answer:
acid + alkali → salt + water
⇒Explanation:
The acid and alkali neutralize each other to create salt and water. Different acids produce different salts.
Sulphuric acid creates Sulphate salts.
Nitric acid creates Nitrate salts.
Hydrochloric acid creates Chloride salts.
The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.
What is Neutralization Reaction ?A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.
In a neutralization reaction, there is a combination of H⁺ ions and OH⁻ ions which form water.
Therefore, The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.
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What activates a convenient current starting to flow of a fluid?
hlo guys you are so bads i
Which of the following would be appropriate
reason(s) for scientists to reject atomic theory
According to the atomic theory, atom is the smallest unit that composes matter.
What is the atomic theory?The atomic theory refers to the theory that insists that the atom is the smallest unit that composes matter.
Scientists may reject the atomic theory if;
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explain what might happen to an organism if it could not adapt to an external change.
Answer:
it would slowly die off and the kinda of animal will not be there because it cant live there because they cant adapt to stay alive
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Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of h2c2o4 and h2o in the balanced reaction? mno4⁻(aq) h2c2o4(aq) → mn2 (aq) co2(g)
The balanced redox reaction, if it occurs in acidic solution, is
5C₂O₄²⁻(aq) + 2MnO₄⁻(aq) + 16H⁺-----> 10CO₂(g) + 2Mn²⁺(aq) + 8H₂O(l)
What are redox reaction?Redox reactions are those in which loss and again of electrons occur.
To balance the redox reaction, we must first break the whole reaction into half equations;
Oxidation half equation
[tex]\rm 5C_2O4^2^-(aq) + 10e + 8H^+----- > 10CO_2(g) + 4H_2O(l)[/tex]
Reduction half equation
[tex]\rm 2MnO_4^- (aq) + 10e + 8H^+----- > 2Mn^2+(aq) + 4H_2O(l)[/tex]
Now combine both the reactions
[tex]\rm 5C_2O_4^2-(aq) + 2MnO4^- (aq) + 16H^+----- > 10CO_2(g) + 2Mn^2+(aq) + 8H_2O(l)[/tex]
Thus, the coefficient of H₂C₂O₄ is 5 and that of water is 8.
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What is the fundamental difference between covalent and ionic bonding?.
Answer:
An ionic bond essentially donates an electron to the other atom participating in the bond, while electrons in a covalent bond are shared equally between the atoms.
Which is the SI base unit for mass?
meter
pound
gram
foot
Answer:
[tex]gram[/tex]
Explanation:
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Substance x is known to exist at 1 atm in the solid, liquid , or vapor phase, depending on the temperature. additionally, the values of these other properties of xhave been determined
Substance x is known to exist at 1 atm in the solid, liquid, or vapor phase, depending on the temperature, is mathematically given as
Q=800J.mol^{-1}
What is a graph of the other properties of x?Generally, the equation for heat absorbed is mathematically given as
Q= Heat capacity of solid *T
In conclusion,
Q= (40)(293.15-273.15)
Q=800J.mol^{-1}
In conclusion, Because the enthalpy of fusion is 9 KJmol-1 and we are only providing 6 KJmol-1 of heat, the melting process will not be complete. the graph is attached.
CQ
Substance x is known to exist at 1 atm in the solid, liquid, or vapor phase, depending on the temperature. additionally, the values of these other properties of x have been determined. show graph
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Which missing item would complete this alpha decay reaction?
Answer:
option c is correct answer.
during alpha decay mass of daughter atom is 4 unit less than its parent atom and its atomic number is 2 unit less than its parent atom.
[tex]\sf so , \: ^4 _2 He \: atom \: is \: released .[/tex]
Therefore, option c is answer.
An alkene X undergoes ozonolysis and gives two compounds Y and Z of molecular formula CHO. Y and Z. are functional isomers of each other Write the two-steps chemical equation for the conversion of X into Y and Z. 121 Write the structural formula of Y and 7. Why are they called functional isomers? [3] ili. What happens when hydrogen gas in the presence of nickel catalyst is passed over X? (1] TV. What is the application of ozonolysis in the organic reaction mechanism? 11 How can you prove chemically the compound X is unsaturated? [1]
The answers to the given questions are given below.
What is Ozonolysis ?A reaction done with Ozone to determine the position of C-C double bond in unsaturated Hydrocarbons.
It is given in the question
An alkene X undergoes ozonolysis and gives two compounds Y and Z of molecular formula CHO
Y and Z. are functional isomers of each other
The two-steps chemical equation for the conversion of X into Y and Z.[tex]\rm \\(CH_3)_2 -C= CH-CH_2-CH_3 + Zn - > CH_3 -CO-CH_3 + CH0-CH_2-CH_3\\\\Y \;is \;CH_3 -CO-CH_3 \\\\and \;Z \;is \;CHO-CH_2-CH_3[/tex]
Here X is 2 methyl pent-2 eneOn reaction with ozone , ozonide is formed[tex]\rm Y \;is \;CH_3 -CO-CH_3 \\\\and \;Z \;is \;CHO-CH_2-CH_3[/tex]
These are functional isomers as they have same molecular weight , but different functional groups.When hydrogen gas in the presence of nickel catalyst is passed over 2 methyl pent-2 eneA process called catalytic Hydrogenation will take place , and the alkene will get converted into alkane , 2-methyl pentaneThe ozonolysis process is useful in the pharmaceutical industry The unsaturation can be tested by bromine water testTo know more about Ozonolysis
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This is the overall reaction of a mercury oxide dry cell:
Zn+ HgO —> ZnO + Hg
In this reaction, which example gets reduced?
O
HgO
Zn
Hg
Answer:
Hg gets reduced
(Look at the equation; notice how Hg loses O while Zn gains it)
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Which of the following best describes radioactivity?
Select one:
a. The amount of reactants converted to products in a certain amount of time.
b. The nuclear force that holds the protons and neutrons in the nucleus.
c. The spontaneous release of nuclear particles and energy.
d. The penetrating ability of nuclear particles.
Explain how the cohesive and adhesive properties of water are useful in maintaining various life processes.
Answer:
Water molecules' adhesion aids plants in moisture absorption at their roots. Water's initial boiling point is attributed to cohesion, which helps animals regulate their body temperature.
Explanation:
A wave is created by causing vibrations in particles of matter. Which
statement about the wave is true?
The wave which is created by causing vibrations in particles of matter is a mechanical wave.
What is a wave?A wave is a disturbance in a medium which transmits transmits energy from one point to another without a permanent displacement of the particles of the medium.
Types of waves include:
electromagnetic wavesmechanical wavesMechanical waves are waves which are produced as a result of the vibrations of the particles of the medium.
Therefore, the wave which is created by causing vibrations in particles of matter is a mechanical wave.
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This diagram shows the basis for forming which of the following
Proteins
Polysaccharide
Nucleus acids
Lipids
(I didn't have this as a question on any of my quizzes, but I will try my best. I wish you luck!)
Answer: Proteins
This is a peptide bond, which is a bond that forms between two amino acids through a condensation reaction. Amino acids make proteins.
Imagine that you need to determine the molarity of a solution that you prepare by dissolving 11.0g of NaCl in exactly 100mL of solution. A. What info do you have B. What info do you need. C. Determine the molarity of the solution.
Answer:
A.) You have been given grams of NaCl (11.0 g) and the volume of the solution (100 mL).
B.) You need to determine the moles of NaCl and the volume of the solution in liters. To find the moles of NaCl , you need to know the molar mass of NaCl.
C.) 1.88 M
Explanation:
To find the molarity of the solution, you need to (1) convert mL to L (by dividing by 1,000), then (2) convert moles NaCl to grams (via molar mass from periodic table), then (3) plug the values into the molarity equation.
Volume = 100 mL / 1,000 = 0.100 L
Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol
Molar Mass (NaCl) = 58.44 g/mol
11.0 g NaCl 1 mole
----------------- x --------------- = 0.188 moles NaCl
58.44 g
Molarity = moles / volume
Molarity = 0.188 moles / 0.100 L
Molarity = 1.88 M
The theoretical yield of zinc oxide in a reaction is 486 g. what is the percent
yield if 399 g is produced?
a. 29.6%
b. 4.93%
c. 82.1%
d. 122%
82.09% is the percent yield if 399 g is produced. Hence, option C is correct.
What is the percent yield?Percent yield is the percent ratio of actual yield to the theoretical yield.
Given data:
Actual yield = 399 g
Theoretical yield = 486 g
%Yield = [tex]\frac{Actual \;Yield \;X \;100 }{Theoretical \;Yield}[/tex]
%Yield = [tex]\frac{399 gX \;100 }{486 g \;Yield}[/tex]
= 82.09%
82.09% is the percent yield if 399 g is produced.
Hence, option C is correct.
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Which of the following is a negative aspect of nuclear fusion?
A. It requires a large amount of fuel.
OB. A meltdown would be more dangerous than a traditional nuclear meltdown.
OC. It is very expensive to develop.
D. It produces as much waste as nuclear fission.
Reset Selection
Answer:
(D) It is very expensive to develop.
Explanation:
There are currently no active fusion reactors because of not only the cost of development but more importantly the difficulty.
It is very expensive to develop. Hence, option C is correct.
What is nuclear fusion?Nuclear fusion involves the fusion of 2 smaller nuclei into bigger nuclei. Nuclear fission on the other hand involves the fission/splitting of a large radioactive nucleus into smaller nuclei which are comparatively stable.
A negative aspect of nuclear fusion is that there are currently no active fusion reactors because of not only the cost of development but more importantly the difficulty.
Hence, option C is correct.
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