Answer:
Theoretical yield = 0.24 gram (Approx)
Explanation:
Given:
Butan-2-1
Molar mass(butan-2-ol) = 74.12 g/mol
Molar mass(butan-2-one) = 72.11 g/mol
Density of butan = 0.806 g/mol
Volume = 0.30 ml
Computation:
Mass of 2-butan = Density of butan × volume
Mass of 2-butan = 0.806 g/mol × 0.30 ml
Mass of 2-butan = 0.2418 g
Mass of product = Mass of 2-butan × [1 mol of butan-2-ol / 74.12] × [1 mol of butan-2-one / 1 mol of butan-2-ol] × [72.11 g/mol / 1 mol of butan-2-one]
Mass of product = 0.235 gram
Theoretical yield = 0.24 gram (Approx)
Which of the following is NOT an indicator of a chemical
reaction?
O A. Breaking into small pieces
OB. Producing a solid
OC. Changing color
OD. Producing light
Answer:OD. Producing light
Explanation:
Read the passage. Oceans and seas can act as a buffer heat reservoir to regulate climates. They can absorb great quantities of heat in the summer, with very little temperature change. In the winter, oceans and seas release the heat. This is the main reason why coastal climates are milder compared to terrestrial climates. Which choice correctly explains this phenomena? A) the high freezing point of water caused by the strength of O–H bonds B) the high boiling point or water caused by hydrogen bonding C) the high heat of vaporization of water caused by the strength of O–H bonds D) the high specific heat of water caused by hydrogen bonding
Answer:
D) the high specific heat of water caused by hydrogen bonding
Explanation:
The water has a higher specific heat and is due to the bonding of H2 molecules by the water. When the bonding is broken the heat is released and water molecules can move freely. This leads to a decline in the temperatures and thus the heat is released in winters and coastal climates are considered to be milder than terrestrial climates. As the energy is released on condensation.What name is given to substances in which atoms of two or more elements are chemically combined?
Answer:
Compounds
Explanation:
Substances in which atoms of two or more elements are chemically combined are called compounds.
A compound is a substance formed when two or more elements are chemically joined.
Answer:
Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in definite proportions, by chemical means. Compounds may be formed by combining atoms of their constituent elements by ionic bonds or by covalent bonds.
Explanation:
A 100.0 g sample of sugar contains carbon, hydrogen, and oxygen. The sample contains 40.0 g of carbon and 53.3 g of oxygen. What mass of hydrogen is in the sample?
Answer:
I think this is it.
Explanation:
As all the mass of other molecules are given and we have to find the mass of hydrogen so total subtracted by carbon and oxygen.
what is the product 100g and 150g
Answer:
15000 g
Explanation:
We simply multiply 100 grams with 150 grams to get 1.5(10⁴) grams.
Answer:
0.015 kg2
Explanation:
what is the volume occupied by 4 grams of oxygen at room temperature
Answer:
volume of O2 = 3000cm³
Explanation:
no. of moles= mass of oxygen (g)/molar mass of oxygen(g/mol)
= 4/32
=0.125
volume of oxygen= no. of moles × 24000 cm³ (or 24dm³)
= 0.125 × 24000 cm³
=3000cm³ (or 3dm³)
If 1 atom of sulfur combines with 2 atoms of oxygen to form sulfur dioxide, what is the ratio of mass of sulfur atom to mass of oxygen atom in sulfur dioxide?
Answer: The ratio of mass of sulfur atom to mass of oxygen atom in sulfur dioxide is 1: 1.
Explanation:
Law of constant proportion states that In a chemical substance the elements are always present in definite proportions by mass. This law is also known as 'Law of definite proportions '.
Mass of 1 atom of sulphur = 32 g
Mass of 1 atom of oxygen = 16 g
Mass of 2 atoms of oxygen =[tex]16g\times 2=32g[/tex]
In formation of [tex]SO_2[/tex] , 1 atom of sulfur combines with 2 atoms of oxygen and thus the mass ratio will be 32: 32= 1:1 .
Thus the ratio of mass of sulfur atom to mass of oxygen atom in sulfur dioxide is 1: 1.
Match the following.
1. A substance that produces hydrogen ions in solution; alternatively, a proton donor
2. A substance that produces hydroxide ions in solution; alternatively, a proton acceptor
a. acid
b. base
Answer:
1. Acid produces hydrogen ions in a solution.
2. Base produces hydroxide ions in a solution.
Answer:
1. A substance that produces hydrogen ions in solution; alternatively, a proton donor
Acid
2. A substance that produces hydroxide ions in solution; alternatively, a proton acceptor
Base
Gold and Platinum are found in free state in nature-Give reason.
Based on the law of Conservation of Mass, what happens to the mass of a substance in a chemical change? A: the mass is always conserved B: The mass is either created or destroyed C: the reactant always has more mass D: the product always has more mass
Answer:
A.
Explanation:
The amount of mass always stays the same, matter cannot be created nor destroyed, it can only change forms. Thus, the answer is A.
In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.
I hope this helps..
11. Which of the following is true about nitrogen-14 and nitrogen-16?
A.They are isotopes of the same atom.
B.They are the same except that carbon-14 has 2 extra electrons.
C.They are completely different atoms.
D.They are the exact same atom.
Answer:
The answer is option A.
They are isotopes of the same atom.
Hope this helps you
Which tool was used to collect the solid product of the chemical reaction? the balance the funnel with the filter paper the Erlenmeyer flask the beaker the watch glass With this tool, the could be separated from the .
Answer:
B. The Funnel withe the filter paper.
Explanation:
The next answers is copper and aqueous solution.
The statement, that describes tool was used to collect the solid product of the chemical reaction is "the funnel with the filter paper."
What is a chemical reaction ?
A chemical reaction is a process that converts one or more compounds, known as reactants, into one or more distinct substances, known as products.
Filtration is a basic process for removing solid particles suspended in a liquid solution. Filtration is a method of separating solids from liquids or gases by employing a filter material that enables the fluid but not the solid to pass through. A funnel with filter paper can be used to gather solid product during the filtration process.
Hence the correct answer is the funnel with the filter paper.
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how does the vapor pressure of water at 10°C compared with its vapor pressure at 50°C ?
Answer: The vapor pressure of water at 10°C will be less as compared with its vapor pressure at 50°C.
Explanation:
Vapor pressure of a liquid is defined as the pressure exerted by the vapors in equilibrium with the liquid/solution at a particular temperature.
As Kinetic energy is dependent on the absolute temperature of the gas.
[tex]K.E=\frac{3}{2}RT[/tex]
where R = gas constant
T = temperature
On increase in temperature, the kinetic energy of the molecules increase and thus more liquid molecules can escape to form vapours and thus will exert more vapor pressure.
Thus the vapor pressure of water at 10°C will be less as compared with its vapor pressure at 50°C.
A car travelling at 50m/s produces a force of 200N. What is the power of the engine in kilowatts(KW).
Answer:
10 kilowatts or 10,000 kw
Explanation:
Power = Force × Velocity
Given that:
Velocity of car is 50 m/s
The force is 200N
The power would be:
P = 200 × 50
P = 10,000 W
Notice that it only reaches watts because of the unit of the velocity is m/s. Standard unit to make Kw is km.
Since:
1 kw = 1000 w
10 kw = 10000 w
Credits to the person below me for correction.
Answer:
10 KW
Explanation:
The speed of the car is 50m/s.
The force of 200N is produced.
Power (W) = Velocity (m/s) × Force (N)
Power (W) = 50 × 200
Power (W) = 10000
1 Nm/s = 1 Watt
The power in Watts is 10000. The question asks for the power in kilowatts.
1 kilowatts = 1000 Watts
10000/1000 = 10 kilowatts
One intresting note is that bleach has a lower measured pH than given based on its color. Why is that? (Hint: what is bleach used for)
It is used for cleaning and other use. Higher pH means stronger base.
which type of evidence do you think is most useful in an investigation? why?
Answer:
I THINK PHYSICAL EVIDENCE IS THE MOST USEFUL IN AN INVESTIGATION BECAUSE IT IS THE MOST BLACK AND WHITE OUT OF ALL THE TYPES OF EVIDENCE. IT'S ONE THING TO LISTEN TO A TESTIMONY OR LOOK AT DOCUMENTS, BUT IT'S ANOTHER THING TO HAVE THE SUSPECT'S DNA AT THE CRIME SCENE.
Explanation:
Answer:
Trace evidence is most importent because it leads to the person who comited the crime faster than normal evidence. Finger prints, hair, skin cells, and fingernails are examples of trace evidence. No two people have the same DNA or print unless their identical twins so this can find out who the guilty person is esely but you still need to find the story to how and what the person did makeing physical evidence the secend most importent.
Explanation:
How to get a catalyst back at the end of a chemical reaction?
Answer:
You should get the catalyst back already.
Explanation:
A catalyst shouldn't be used up during a chemical reaction. It is used to speed up a reaction, but it shouldn't disappear/be used up by a chemical reaction.
Acid rain is the direct result of acid released by burning fossil fuels.
Please select the best answer from the choices provided
ОТ
OF
Answer:
The answer is TrueHope this helps you
Calculate the amount of gold deposited when a current of 5A is passed through a solution of gold salt for 2hrs 15mins. If the same current is used, find the time taken for 6g of gold to be deposited. (Au=197 1faraday=96500c)
Answer:
a. 82.68 g b. 9.8 min
Explanation:
a. The amount of gold deposited by 5 A current in 2 hrs 15 mins
Since charge Q = It where I = current = 5 A and time = 2 hrs 15 mins = 2 × 60 min + 15 min = 120 + 15 min = 135 min = 135 × 60 s = 8100 s
Q = 5 A × 8100 s
= 40500 C
Also, Q = nF where n = number of moles of gold deposited and F = Faraday's constant = 96500 C
n = Q/F = 40500 C/96500 C = 0.4195 moles ≅ 0.42 mole
Now n = m/M where m = mass of gold and M = molar mass of gold = 197
m = nM
= 0.42 × 197 g
= 82.68 g
b. The time taken for 6g of gold to be deposited.
We first find the number of moles of gold in 6g of gold
Since n = m/M and m = 6 g
n = 6/197 = 0.0305 mole
Q = It = nF
t = nF/I
= 0.0305 mol × 96500 C/5 A
= 2939.09 mol C
= 587.82 s
Changing t to minutes
587.82/60 s = 9.8 min
While camping you light a small campfire, initiating the combustion of wood to produce heat and
light. What can you determine about this reaction?
O A. It is exothermic.
B. The bond making energy is more than 600 kJ.
OC. It is endothermic.
D. The bond breaking energy is more than 600 kJ.
Answer:
A. It is exothermic
Explanation:
Combustion is a chemical reaction in which a substance combines with oxygen present in air to produce carbon (iv) oxide and water as well release heat and light energy.Combustion is an exothermic process.
An exothermic reaction releases energy in the form of heat to the surroundings. The energy required to break bonds in the reactants is less than the energy required to form new bonds in the products in an exothermic reaction.
From the given options;
A. It is exothermic is determinable since the reaction is a combustion reaction
B. The bond making energy is more than 600 kJ is not certain because the mass of the wood being burnt is not given. Also, wood is not composed of a specific element that would be taking part in the reaction, rather it is composed of various substances.
C. It is endothermic. is wrong because combustion of wood is exothermic.
D. The bond breaking energy is more than 600 kJ is not certain because the mass of the wood being burnt is not given. Also, wood is not composed of a specific element that would be taking part in the reaction, rather is composed of many substances.
Calcium (Ca) has an atomic number of 20. It can form an ion by losing 2
electrons. What would its charge be?
A. 18
B. 22
C. 2+
D. 2-
Answer:
2+
Explanation:
Apex lolz
Study the following reaction: NH4+(g) + NO2⁻(g) ⟶ N2(g) + 2H2O(l) How does the rate of this reaction change when the temperature is increased? A) The rate decreases because a higher temperature means that particles move at higher speeds and there are more collisions in the system. B) The rate decreases because a higher temperature means that particles move at lower speeds and there are fewer collisions in the system. C) The rate increases because a higher temperature means that particles move at lower speeds and there are fewer collisions in the system. D) The rate increases because a higher temperature means that particles move at higher speeds and there are more collisions in the system.
Answer:
D). The rate increases because a higher temperature means that particles move at higher speeds and there are more collisions in the system.
Explanation:
The rate of the given chemical reaction would rapidly increase with an increase in temperature as the higher temperature will increase the kinetic energy possessed by the reactant molecules. This will lead to the movement of particles at a higher speed and more effective collisions will take place(as the greater proportion of molecules will have the energy required for collision). Thus, the last statement correctly justifies this description and hence, option D is the correct answer.
a. What effect does adding a solute to a solvent have on the freezing point of the solvent? What equation describes the effect? b. What effect does adding a solute to a solvent have on the boiling point of the solvent? What equation describes the effect?
Answer:
a. Adding a solute to a solvent results in freezing point depression that is lowering of the freezing point of the solvent
The equation that describes the effect is [tex]\Delta T_f = K_f \times m \times i[/tex]
b. The effect of adding a solute to a solvent have on the boiling point of the solvent is the elevation of the boiling point of the solvent
The equation that describes the effect of boiling point elevation is given as follows;
[tex]\Delta T_b = K_b \times m \times i[/tex]
Explanation:
[tex]\Delta T_f = K_f \times m \times i[/tex]
Where:
[tex]\Delta T_f[/tex] = [tex]T_{f(pure \ solvent)}[/tex] - [tex]T_{f(solution)}[/tex]
[tex]K_f[/tex] = Constant for Molal freezing point
i = van't Hoff factor which is the number of irons present in each solute molecule
m = Molality of the solution
[tex]\Delta T_b = K_b \times m \times i[/tex]
Where:
[tex]\Delta T_b[/tex] = [tex]T_{f(pure \ solvent)}[/tex] - [tex]T_{f(solution)}[/tex]
[tex]K_b[/tex] = Constant for Molal freezing point
i = van't Hoff factor which is the number of irons present in each solute molecule
m = Molality of the solution
Adding a solute to a solvent affects the freezing point and boiling point of the solvent by either lowering or raising them, respectively. These effects can be described using the freezing point depression and boiling point elevation equations, which take into account the molality of the solute and the constants specific to each solvent.
a. When a solute is added to a solvent, it lowers the freezing point of the solvent. This phenomenon is known as freezing point depression. The equation that describes the effect is the freezing point depression equation:
∆T = Kf * m
where ∆T is the change in freezing point, Kf is the cryoscopic constant, and m is the molality of the solute.
To explain this further, when a solute is added to a solvent, it disrupts the regular arrangement of solvent molecules in the crystal lattice during freezing. This makes it more difficult for the solvent to form a solid, resulting in a decrease in the freezing point.
For example, if you add salt (NaCl) to water, the salt molecules will mix with the water molecules. As a result, the freezing point of the water will decrease, and it will require a lower temperature for the water to freeze.
b. Adding a solute to a solvent also raises the boiling point of the solvent. This is known as boiling point elevation. The equation that describes the effect is the boiling point elevation equation:
∆T = Kb * m
where ∆T is the change in boiling point, Kb is the ebullioscopic constant, and m is the molality of the solute.
To understand this concept, when a solute is added to a solvent, the solute particles disrupt the intermolecular forces between solvent molecules. This increases the boiling point of the solution because more heat energy is required to overcome the stronger intermolecular forces between the solute and solvent particles.
For instance, if you dissolve sugar (C12H22O11) in water, the sugar molecules will interact with the water molecules. As a result, the boiling point of the water will increase, and it will require a higher temperature for the water to boil.
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A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion. B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. C. If Assertion is true statement but Reason is false. D. If Assertion is false and Reason is true i Assertion: .Burning of magnesium ribbon produce whitish powder called magnesium oxide. Reason : Magnesium is generally cleaned by rubbing it on sand paper
Answer:
C. If Assertion is true statement but Reason is false.
Explanation:
The burning of magnesium in air produces magnesium oxide as shown by the equation;
2Mg(s) + O2(g) -----> 2MgO(s)
The magnesium oxide solid is recovered as a white ash. This is a typical example of an oxidation reaction which is also a combustion reaction.
The reason has nothing at all to do with the assertion hence the answer given.
Magnesium oxide is basic just like the oxides of other metals and dissolves in water to yield an alkali.
Answer:
Answer:
C. If Assertion is true statement but Reason is false.
Explanation:
The burning of magnesium in air produces magnesium oxide as shown by the equation;
2Mg(s) + O2(g) -----> 2MgO(s)
The magnesium oxide solid is recovered as a white ash. This is a typical example of an oxidation reaction which is also a combustion reaction.
The reason has nothing at all to do with the assertion hence the answer given.
Magnesium oxide is basic just like the oxides of other metals and dissolves in water to yield an alkali.
Explanation:
What are the periodic trends of ionic radii? Check all that apply. Ionic radii tend to increase down a group. Ionic radii tend to decrease across a period. Anionic radii tend to increase across a period. Cationic radii tend to decrease across a period. Ionic radii increase when switching from cations to anions in a period.
Answer:
What are the periodic trends of ionic radii? Check all that apply.
*Ionic radii tend to increase down a group.
Ionic radii tend to decrease across a period.
Anionic radii tend to increase across a period.
*Cationic radii tend to decrease across a period.
*Ionic radii increase when switching from cations to anions in a period.
Answer:
- Ionic Radii Tend To Increase Down A Group.
- Cationic Radii Tend To Decrease Across A Period.
- Ionic Radii Increase When Switching From Cations To Anions In A Period.
Explanation:
i got it correct on edge
Anyone know how to answer this?
Answer:
i metal
ii nonmetal
iii metal
iv nonmetal
Explanation:
If you look up what the element of a heater is, you get a picture of some sort of rod. It's the heating element of the heater, and must be some type of metal to conduct electricity and warm up. Fishing rods are made of either fiberglass, graphite, or carbon fibre. These are nonmetals. In order for a lightning rod to conduct electricity and bring the lightning down to the ground, it has to be metal. You wouldn't want a metal oven mitt, as that would burn your hand.
(Please someone help!) Explain how you would determine the molar mass of Ca(NO3)2
Answer: 164.09 g/mol
Explanation:
Which of the following describes what happens in a chemical reaction?
O A. Molecules change from one phase to another.
B. Molecules dissolved in solution are separated again.
O c. Chemical bonds are broken, and new ones are formed.
O D. Molecules mix without rearranging atoms.
Answer:
c. Chemical bonds are broken, and new ones are formed.
Explanation:
Hope this helps. :)
In a chemical reaction, chemical bonds are broken, and new ones are formed.
What is a chemical reaction?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Which missing item would complete this beta decay reaction?
Answer:
The answer is option A.Hope this helps you
write down the new substance formed when ammonia react with hydrochloric acid
Answer: ammonium chloride
Explanation: The reaction equation among ammonia (NH3) and hydrochloric acid (HCl) is written as follows: NH3+HCl=NH4Cl. Ammonia is a susceptible base that reacts with hydrochloric acid, forming a compound referred to as ammonium chloride.