Answer:
A Chemical reaction involves changes in energy in the form of absorbtion and release of heat due to the formation and breakdown of chemical bonds. A chemical reaction is categoried as endothermic reaction in which heat energy is take in or absorbed and exothermic reaction in which energy is released.
A model can be created by following below details:
Take a beaker and put 10 milliliters of vinegar in it.Place a thermometer in the beaker and measure the initial temperature.Then add half teaspoon of baking soda, that results into decreasing in the temperature.So, the decrease in temperature shows it is an endothermic reaction in which heat energy is absorbed.
Energy change in the reaction has been stored in the products and the reactants. The change in the reactant to product results in a change in energy.
According to the law of conservation of energy, energy can neither be created nor destroyed in a chemical reaction. The chemical reaction has been resulted in the energy change by the endothermic and exothermic reactions.
The project model for energy change can be:
The general model for an endothermic reaction:Reactant + Energy = Products.
The ice cube has been placed in a beaker. It has been consisted of the stored potential energy. WIth the application of heat energy there has been the conversion of ice cubes to the water, and the potential energy of the ice cubes has been converted to the kinetic energy of the moving liquid particles.
The general model for the exothermic reaction:Reactant = Product + Energy
The model has consisted of matching the light with a matchstick. The chemical energy of the stored matchstick has been converted to light and heat energy.
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which of these questions is a scientific question?
A) Are lentils a more enjoyable source of fiber that black beans?
B)Which contains higher level of vitamin B -orange or spinach ?
C)Does asparagus taste better that Brussels sprouts ?
D) Do yellow apples taste better that red apples ?
HELP !!!!!!!!!!!
Complete the passage to Distinguish between mechanical and electromagnetic waves.
Answer:
waves that move through matter only are called mechanical waves.
waves that move through space only are called electromagnetic waves.
Waves that move through matter only are called
(mechanical) waves.
Waves that move through space are called
(electromagnetic) waves.
Could I get a brainliest please?
Answer my question please
Answer:
Explanation:F
A farmer wants to start growing sweetcorn on his farm. He has found out that sweetcorn grows best in soil with a pH value of approximately 7.5. Explain how he can use the knowledge of acids, alkalis, and neutralisation to find out the pH value of his soil to make sure he gets the best crop possible
Answer:
The process to use this knowledge is explained as below:
Explanation:
1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.
2. If the field or the farm has alkali soil add acid to reduce the pH value.
3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.
4. It will be a neutralization reaction and changes the pH value of the farm.
5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.
6. The pH value will need to be regularly monitored and adjusted.
what mass of methanol is produced when 280.2 g of carbon monoxide reacts with 50.5 g of hydrogen? CO(g)+2H2(g)—> CH3OH(l)
Answer:
320.23g of CH3OH.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
CO(g) + 2H2(g)—> CH3OH(l)
Next, we shall determine the masses of CO and H2 that reacted and the mass of CH3OH produced from the balanced equation. This is illustrated below below:
Molar mass of CO = 12 + 16 = 28g/mol
Mass of CO from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 2 x 2= 4g
Molar mass of CH3OH = 12 + (3x1) + 16 + 1 = 32g/mol
Mass of CH3OH from the balanced equation = 1 x 32 = 32g
From the balanced equation above,
28g of CO reacted with 4g of H2 to produce 32g of CH3OH.
Next, we shall determine the the limiting reactant. This is illustrated below:
From the balanced equation above,
28g of CO reacted with 4g of H2.
280.2g of CO will react with =
(280.2 x 4)/28 = 40.03g of H2.
From the calculations made above, we can see that only 40.03g out of 50.5g of H2 is required to react completely with 280.2g of CO.
Therefore, CO is the limiting reactant and H2 is the excess reactant.
Finally, we shall determine the mass of methanol, CH3OH produced from the reaction.
In this case, the limiting reactant will be used because it will give the maximum yield of the reaction since all of it is used up in the reaction. The limiting reactant is CO and the mass of methanol, CH3OH produced can be obtained as follow:
From the balanced equation above,
28g of CO reacted to produce 32g of CH3OH.
Therefore, 280.2g of CO will react to produce = (280.2 x 32)/28 = 320.23g of CH3OH.
Therefore, 320.23g of CH3OH were produced from the reaction.
Mention 6 products from coal tar as a result of destructive distillation of coal
Answer:
Coke, coal gas, gas carbon, ammonia liquor, and coal oil
hello can you please help me to solve above questions. .
Answer:
i)a. P & R
b. Q& S
ii) R
iii) Atomic no & Atomic radius
2)a. C4H10
b. CH3Cl
OK this is a serious question now XD A) NAME ONE WAY THAT ORGANISMS USE CARBON= ? B) NAME THE ONE PROCESS WHICH DECREASES CO2 IN THE ATMOSPHERE= ? C) NAME THE ONE PROCESS WHICH INCREASES CO2 IN THE ATMOSPHERE= ?
Answer:
A) anaerobic respiration
B) photosynthesis
C) breathing
. ______________ will slow down alcohol absorption. Sleeping well Food in the large intestine Being happy and relaxed Food in the stomach that is high in protein
Answer:
Food in the stomach that is high in protein will dilute absorption of alcohol in your stomach :) therefore always drink with food in your stomach, just drinking alchol without food will have serious consequences on helath.
Explanation:
How does temperature affect the rate of a reaction?
A. Increasing the temperature decreases the potential energy of the
reactants.
B. Increasing the temperature gives the molecules more kigetic
energy
C. Increasing the tek perature increases the concentration of the
reactants
D. increasing the per perature lowers the activation energy of the
reaction
Vincent graduated from college with a degree in horticulture and now owns a local plant nursery. He maintains a blog titled, "How to Live a Happy Life,” and writes that people can lead happier lives by varying the routes they usually take home from work. Which statement best evaluates this claim? This claim is scientific because it is based on Vincent’s personal experience. This claim is scientific because other people have taken his advice and are now happier. This claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology. This claim may not be accurate because most people follow the same route home.
Answer:
this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.
Explanation:
Answer:
this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.
Explanation: give the branliest to the otherperson :)
In order to answer this question, you need to look around your immediate surroundings to find examples of rusting of iron or any other metal. i. What makes iron rust? ii. Why is the rusting of iron a problem? Give any 3 examples from daily life where rusting has been a disadvantage. iii. Suggest any two ways that can help prevent rusting of iron.
Answer:
(i) rusting is caused by the reaction of oxygen and water on the surface of metals(iron).
(ii) rusting of iron makes it weak and dangerous for buildings since their foundation is made of iron, rusting renders cars useless, rusting can cause accidents.
(iii) by galvanizing iron
and by coating it.
Explanation:
hope it helps .
A sample of wood with a mass of 30 g has its
temperature changed from 10° to 45° C. In the
process, it releases 90 J of heat. What is its specific
heat?
Answer:
0.086J/g°C
Explanation:
The following data were obtained from the question:
Mass (M) = 30g
Initial temperature (T1) = 10°C
Final temperature (T2) = 45°C
Change in temperature (ΔT) = T2 – T1 = 45°C – 10°C = 35°C
Heat (Q) released = 90J
Specific heat capacity (C) of wood =..?
We can obtain the specific heat capacity of the wood as follow:
Q = MCΔT
90 = 30 x C x 35
Divide both side by 30 x 35
C = 90/(30 x 35)
C = 0.086J/g°C.
Therefore, the specific heat capacity of the wood is 0.086J/g°C.
Which of the following are true of phases?Check all that apply.A.The particles in a liquid are in a fixed location.B.Gases have more kinetic energy than liquids or solids.C.The particles of a solid vibrate.D.Gases have weak intermolecular forces between the atoms or molecules.
Answer:
D. Gases have weak intermolecular forces between them
Identify the following as an example of a physical or chemical. Olive oil, vinegar, salt, and pepper are shaken together together to make salad dressing
Answer:
Chemical Change
Explanation:
Mixing these elements together creates a chemical change
Making of a salad dressing is a physical change as there is no change in the chemical composition.
What is a physical change?
Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
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Diphosphorus pentoxide(P2O5) reacts with water to form phosphoric acid, a major industrial acid. In the laboratory, the oxide is used as a drying agent. a.What is the mass of 4.65 x 10 22molecules of phosphorus pentoxide?
Answer: The mass of [tex]4.65\times 10^{22}[/tex] molecules of phosphorus pentoxide is 20.5 g
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text {avogadro's number}}=\frac{4.65\times 10^{22}}{6.023\times 10^{23}}=0.0772moles[/tex]
1 mole of [tex]P_2O_5[/tex] weigh = 283.9 g
Thus 0.0772 moles of [tex]P_2O_5[/tex] weigh = [tex]\frac{283.9}{1}\times 0.0722=20.5g[/tex]
Thus the mass of [tex]4.65\times 10^{22}[/tex] molecules of phosphorus pentoxide is 20.5 g
Zinc will displace copper from a solution of copper sulfate, and magnesium will displace zinc from a solution of zinc sulfate. Why can these displacement reactions be regarded as redox reactions? Write down a series of reactivity for these three metals, putting them in order of increasing reactivity.
Answer:
The displacement reactions are regarded as redox reactions because they involve the formal transfer of electrons from one chemical specie to the other
2) The series of reactivity of the metals in the order of increasing reactivity are;
Copper↓
Zinc↓
MagnesiumExplanation:
1) Redox (oxidation-reduction) reaction is a chemical reaction involving the loss and gain of electrons from one chemical species to another, where the chemical species that undergoes oxidation, loses electrons and is termed the reducing agent, while the other chemical species that undergoes reduction, gains electrons, and is termed the oxidizing agent
2) The redox reaction can being based on the affinity for electrons depends on the positions of the reactants in the electrochemical series as well as the chemical reactivity of the metals with zinc being a stronger reducing agent and more chemically reactive than copper and magnesium being a stronger reducing agent and more chemically reactive than zinc
Least reactive (Cu) < (Zn) < Mg Most reactive
Copper < Zinc < Magnesium.
Tom has 1 cup of a 5% vinegar-water solution, 2 cups of a 10% vinegar-water solution, and 3 cups of a 15% vinegar-water solution. He needs at least 8 cups of a 5% vinegar-water solution for his chemistry project. What is the number of cups of pure water he should add to the total of all his vinegar-water solutions to complete the project?
Answer:
Another eight cups of pure water will be required.
Explanation:
Start by calculating the amount (in cups) of vinegar in these six cups:
One cup of [tex]5\%[/tex] vinegar-water solution would contain [tex]0.05[/tex] cups of vinegar.Two cups of [tex]10\%[/tex] vinegar-water solution would contain [tex]2 \times 0.10 = 0.20[/tex] cups of vinegar.Three cups of [tex]15\%[/tex] vinegar-water solution would contain [tex]3 \times 0.15 = 0.45[/tex] cups of vinegar.Therefore, if these six cups of solutions were mixed, the mixture would contain [tex]0.05 + 0.20 + 0.45 = 0.70[/tex] cups of vinegar. Also, the mixture is supposed to have a volume of six cups. Therefore, the concentration of this six-cup mixture would be:
[tex]\displaystyle \frac{0.70\; \rm cups}{6\; \rm cups} \approx 12\%[/tex].
In other words, if these six cups of vinegar-water solutions are mixed, it would be necessary to dilute (by adding more water) before reaching the concentration of [tex]5\%[/tex].
The goal is to dilute this solution with [tex]0.70[/tex] cups of vinegar to a concentration of [tex]5\%[/tex]. Consider: what would be the volume the solution after dilution?
The volume of a solution can be found from the quantity and concentration of its solute:
Quantity of vinegar in this solution: [tex]0.70[/tex] cups.Concentration of vinegar in this solution: [tex]5\% = 0.05[/tex].After dilution, the volume of this solution would be:
[tex]\displaystyle \frac{0.70\; \rm cups}{0.05} = 14\; \rm cups[/tex].
At this moment, this solution only has a volume of six cups. Therefore, [tex]14 - 6 = 8[/tex] cups of pure water will be required.
The mass number of Fo? is 56. How many neutrons are there in a single Fo? atom?
28
30
56
58
Answer: A. 28
If we aren't talking about an isotope, then the number of neutrons and the number of protons in the nucleus are the same. Each proton weighs one atomic unit, and the same can be said about a neutron as well. So half of the weight is from the protons and half is from the neutrons. The electrons are extremely small relative to the protons that their weight is negligible.
What is the concentration of iodine molecules, I 2 in a solution containing 2.54g of iodine in 250 cm 3 of solution?
Answer:
) Molar concentration =1000*2.54/(127*250) ;since molarity=1000*W/M*V
=0.08 M here W=amount of solute in gm
M= molecular weight of solute
v=volume of solution in ml or cm3
2)% concentration (w/v) =(2.54/250)*100=1.016%
Explanation:
On many common appliances, there is an “O” or “I” on the power switch. What does each symbol mean?
What forces hold ionic solids together?
O A. lonic bonds
B. Covalent bonds
C. Metallic bonds
D. Hydrogen bonds
SU
Answer:
the bond that hold the ionic solids together is the ionic bond while the force that holds them together is the electrostatic force.
Explanation:
what do the conclusions tell about the experiments?
A) the conclusions tell what other scientists think about the experiment
B) the conclusions tell how the experiments should be repeated
C)the conclusions tell why the data support or reject the hypothesis
D) the conclusions tell if the scientific method was followed
Help Please !!!!!!!!!!!!!!!!
Answer:
C
Explanation:
APEX
the conclusions of an scientific experiment tell why the data support or reject the hypothesis. Thus option C is correct.
What is scientific experiment ?Scientific experiment involve asking different scientific questions, making hypothesis, design experiment, result and conclusion.
A good scientific experiment should have some facts which can be answered by using data analysis.
The types of scientific questions are Verification questions, Theory questions, Experimental questions
The verification question can be solved by collecting data from observation, which include characteristics or properties of a subject.
A theory question refers an imaginative exercise, is not fictional, depend on prior knowledge of the phenomenon being asking about.
The scientific question or an experimental question used to compare the element of a system when altered, it involves variables such as independent, dependent and controlled variables.
Thus option C is correct.
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pls help me 13 min left if you go past and not help are not mine
Answer:
mushroom
mold
spore cases
hyphae
fungus
Question 28 (2 points)
Which of the following is part of the Kinetic Molecular Theory?
1) gases consist of tiny particles that are close together
2) gas molecules are in constant random motion
3) Il of the above are part of the Kinetic Molecular Theory
4) the average kinetic motion of gas molecules decreases with an increase in
temperature
Marook nie
Answer:
Il of the above are part of the Kinetic Molecular Theory
Explanation:
Answer: Which of the following are part of kinetic-molecular theory?
Choices:
1. The particles in a solid do not move.
2. The particles in a liquid are moving past one another constantly.
3. The particles in gas move freely in all directions.
4. The particles in a solid vibrate in a fixed position.
5. The particles in a solid are far apart.
6. The particles in a gas have few attractions between them.
7. The particles in all states of matter are always moving.
Explanation: Which of the following are part of kinetic-molecular theory...
Answers:
2. The particles in a liquid are moving past one another constantly.
3. The particles in gas move freely in all directions.
4. The particles in a solid vibrate in a fixed position.
6. The particles in a gas have few attractions between them.
7. The particles in all states of matter are always moving.
In the equation E = mc2, what does c represent?
Answer:
c is the speed of light
Explanation:
E: energy
m: mass
c2: speed of light squared
The elements least likely to form bonds are found in which group?
Answer:
Noble gases are a unique set of elements in the periodic table because they don't naturally bond with other elements.
Explanation:
HAVE A GOOD DAY!
Answer:
The answer is Noble Gases!!
Explanation:
Hope i helped yall! Have a super fantastic day!! Play Among Us! (Of course when your done with school) lol, jk, but u can!! Byes yall!
Why is chemistry a science, but alchemy was not?
Answer: Because alchemy was based on mystical belief instead of the scientific method.Soo.. Chemistry uses experiments to test ideas whereas alchemy used superstitious practices.
Explanation:
Answer:
that was because Alchemy was based on experimentation and had little basis in Science, while Chemistry utilizes both experimentation and scientific practices.
Explanation:
Atomic radii decrease, moving from left to right across a period. As a result, the electrons become closer to the nucleus. What effect does this movement have on the ionization energy (the amount of energy required to remove an electron from an atom)? The ionization energy stays the same. The ionization energy decreases. The ionization energy increases. Electrons have no effect on ionization energy.
Answer:
The ionisation energy increases.
Explanation:
This is because the force of attraction between the electrons and the positive nucleus will increase
NiS2(s) + O2(g) --> NiO(s) + SO2(g) When 11.2 g of NiS2 react with 5.43 g of O2, 4.86 g of NiO are obtained. The theoretical yield of NiO is Blank 1 , the limiting reactant is Blank 2 and the percent yield is Blank 3 %.
Answer:
1. The theoretical yield of NiO is 5.09g.
2. O2 is the limiting reactant.
3. The percentage yield of NiO is 95.5%
Explanation:
Step 1:
The balanced equation for the reaction is given below:
2NiS2(s) + 5O2(g) —> 2NiO(s) + 4SO2(g)
Step 2:
Determination of the masses of NiS2 and O2 that reacted and the mass of NiO produced from the balanced equation. This is illustrated below below:
Molar mass of NiS2 = 59 + (32x2) = 123g/mol
Mass of NiS2 from the balanced equation = 2 x 123 = 246g
Molar mass of o3= 16x2 = 32g/mol
Mass of O2 from the balanced equation = 5 x 32 = 160g
Molar mass of NiO = 59 + 16 = 75g/mol
Mass of NiO from the balanced equation = 2 x 75 = 150g
Summary:
From the balanced equation above, 246g of NiS2 reacted with 160g of O2 to produce 150g of NiO
Step 3:
Determination of the limiting reactant. This can be obtain as follow:
From the balanced equation above, 246g of NiS2 reacted with 160g of O2.
Therefore, 11.2g of NiS2 will react with = (11.2 x 160)/246 = 7.28g of O2.
From the above calculation, we can see that it will take a higher mass of O2 i.e 7.28g than what was given i.e 5.43g to react completely with 11.2g of NiS2.
Therefore, O2 is the limiting reactant and NiS2 is the excess reactant.
1. Determination of the theoretical yield of NiO.
In this case, the limiting reactant will be used as all of it is consumed in the reaction. The limiting reactant is O2.
From the balanced equation above, 160g of O2 reacted to produce 150g of NiO.
Therefore, 5.43g of O2 will react to produce = (5.43 x 150)/160 = 5.09g of NiO.
Therefore, the theoretical yield of NiO is 5.09g.
2. The limiting reactant is O2. Please review step 3 above for explanation.
3. Determination of the percentage yield of NiO. This is illustrated below:
Actual yield of NiO = 4.86g
Theoretical yield of NiO = 5.09g
Percentage yield =..?
Percentage yield = Actual yield /Theoretical yield x 100
Percentage yield = 4.86/5.09 x 100
Percentage yield of NiO = 95.5%