PLEASE HELP 50 POINTSSSSSSSS AND BRAINLIESTT
17. Endothermic and exothermic reactions can also be identified through observation. What might you observe that would help you identify a reaction as endothermic or exothermic? (Remember, observations can be made with any of your five senses.) (2 pts)
Answers
Answer:
•Endothermic and exothermic reactions can also be identified through observation. What might you observe that would help you identify a reaction as endothermic or exothermic?
By comparing the energy used when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall. ... Chemical reactions that absorb (or use) energy are called endothermic.
Explanation:
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Answer:
○ Endothermic reaction - a chemical reaction that absorbs energy from the surrounding environment “en-“ means in – it takes heat in – feels cold
○ Exothermic reaction - a chemical reaction that releases energy into the environment “exo-“ means out – sends heat energy out – feels warm or hot
Explanation:
Related Questions
How much H₂ is needed to react with 6.58 g of O₂ in this reaction?
H₂ + O₂ --> H₂O
Answers
For this reaction the balanced chemical equation is
2
H
2
+
O
2
→
2
H
2
O
The mole ratios are determined using the coefficients of the substances in the balanced chemical equation.
2
m
o
l
H
2
:
1
m
o
l
O
2
:
2
m
o
l
H
2
O
The mole ratio for
O
2
H
2
O
is:
2
m
o
l
H
2
:
1
m
o
l
O
2
2
m
o
l
H
2
1
m
o
l
O
2
or
1
m
o
l
O
2
2
m
o
l
H
2
1
m
o
l
O
2
:
2
m
o
l
H
2
O
1
m
o
l
O
2
2
m
o
l
H
2
O
or
2
m
o
l
H
2
O
1
m
o
l
O
2
I hope this was helpful.
2. Sodium Bicarbonate decomposes when heated to form sodium carbonate, water, and
carbon dioxide gas. If 1.8 moles of carbon dioxide are produced, how many moles of
sodium bicarbonate were decomposed?
Answers
Answer:
3.6 moles of sodium bicarbonate were decomposed.
Explanation:
The decomposition of sodium bicarbonate (NaHCO₃) to form sodium carbonate (Na₂CO₃), water, and carbon dioxide gas can be represented by the following balanced chemical equation:
[tex]\displaystyle 2\text{NaHCO$_3$}_\text{(s)} \longrightarrow \text{Na$_2$CO$_3$} + \text{H$_2$O}_\text{($\ell$)} + \text{CO$_2$}_{\text{(g)}}[/tex]
We want to determine the amount of sodium bicarbonate decomposed when 1.8 moles of carbon dioxde is produced.
From the equation, we can see that the mole ratio between carbon dioxide and sodium bicarbonate is 1:2. That is, there is one mole of carbon dioxide produced for every two moles of sodium bicarbonate.
Therefore:
[tex]\displaystyle 1.8\text{ mol CO$_2$} \cdot \frac{2\text{ mol NaHCO$_3$}}{1\text{ mol CO$_2$}} = 3.6\text{ NaHCO$_3$}[/tex]
In conclusion, 3.6 moles of sodium bicarbonate were decomposed.
What is the ground-state electron configuration of a neutral atom of manganese?.
Answers
Explanation:
elctronic configuration of manganese
Mn=1s²2s²2p⁶3s²3p⁶4s²3d⁵
ground state
Mn=Ar3d⁵4s²
note that Ar is argon
When carbohydrates
are
digested by the body, what molecule do they become?
Answers
Answer:
Glucose
Explanation:
Both simple and complex carbohydrates break down into glucose (aka blood sugar). A simple carb is one that's comprised of one or two sugar molecules, while a complex carb contains three or more sugar molecules.
HOPE IT HELPS! BE SAFE :)
Answer:
Glucose
Explanation:
Both simple and complex carbohydrates break down into glucose.
Water contains hydrogen and oxygen. Hydrogen is an explosive gas, while oxygen is a flammable gas. Will the physical properties of water be similar? Why or why not?
Answers
Answer:
hope you like it
Explanation:
No, your refreshing glass of water won't spontaneously combust. Water is made up of two elements, hydrogen and oxygen. Hydrogen is flammable, but oxygen is not. ... You can, however, break it down into hydrogen and oxygen by putting energy into it, in the form of an electric current.
Based on this information, do you think that the mole should be considered a base unit in the Sl system? Explain why or why not.
Answers
Answer:
I jus had this but i forgot srry!
Explanation:
I need help. A chemist wants to dilute 100.0 ml of 2.50 M Sulfuric acid to 0.50 M Sulfuric acid. To what volume must it be diluted?
Answers
Taking into account the definition of dilution, to a volume of 500 mL, a solution of 100.0 mL of 2.50 M Sulfuric acid must be diluted to 0.50 M Sulfuric acid.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal volumeIn this case, you know:
Ci= 2.50 MVi= 100 mLCf= 0.50 MVf= ?Replacing in the definition of dilution:
2.50 M× 100 mL= 0.50 M× Vf
Solving:
(2.50 M× 100 mL)÷ 0.50 M= Vf
500 mL= Vf
In summary, to a volume of 500 mL, a solution of 100.0 mL of 2.50 M Sulfuric acid must be diluted to 0.50 M Sulfuric acid.
Learn more about dilution:
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A cheese puff contains 15 g of carbohydrate. If carbohydrates have a caloric value of 4 kcal/g, how many kcal are obtained from the carbohydrate in the cheese puff?
Will Mark Brainliest
Help Plss!!
Answers
hope it helps
cheese puff contains 15 g of carbohydrates
caloric value of carbohydrates=4kcal/g
1kcal=1000cal
4kcal/g= 4000cal/15g
ans. 266.6
kcal= 0.267 kcal.
Consider the reaction below. HClO3 NH3 Right arrow. NH4 ClO3– Which is a base-conjugate acid pair? NH3 and ClO3– NH3 and NH4 HClO3 and NH3 HClO3 and NH4.
Answers
Bronsted-Lowry acid-base theory states about the donation or the acceptance of the protons by the chemical species. [tex]\rm NH_{3}[/tex] and [tex]\rm NH_{4}^{+}[/tex] are the base/conjugate acid pair.
What are the acid and base pairs of the lowry theory?According to this theory, the bases are the proton [tex](\rm H^{+})[/tex] acceptors and acids are proton contributors, the reaction between the species of the acids and bases results in the proton transfer.
An acid that donates or loses the proton to form an ion or molecule forms a conjugate base while the base that accepts proton are called conjugate acids. It can be shown as,
[tex]\rm acid + base \rightleftarrows conjugate\; base + conjugate \;acid[/tex]
In the reaction of [tex]\rm HClO_{3}[/tex] and [tex]\rm NH_{3}[/tex] the chloric acid acts like acid and donates proton while ammonia acts as a base because it accepts the proton.
Therefore, option B. [tex]\rm NH_{4}^{+}[/tex] is the conjugate acid of the ammonia and[tex]\rm ClO_{3}^{-}[/tex] is the conjugate base of chloric acid.
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Answer:
B.) NH3 and NH4+
Explanation:
"What can I say except your welcome" -Maui, 2016
Water is added to liquid isopropanol (a polar liquid) to form a solution of rubbing alcohol. Describe what happens on the molecular level as the water dissolves in the isopropanol. Select the correct step order from the drop-down menu for each step listed. The polar isopropanol molecules are attracted to the polar water molecules at the surface of the water. The water molecules spread evenly throughout the solution. The water molecules are carried into the solution. The isopropanol molecules surround the water molecules.
Answers
Isopropanol molecules are attracted to water at the surface and surround them. The water gets carried in and gets spread evenly in the solution.
What is the mechanism of water dissolution?A solution is formed when the water and the isopropanol get mixed and dissolved. Isopropanol is a polar solute that dissolves the water molecule in it to form a solution.
The polar molecules of the isopropanol get attracted towards the polar water molecules and start surrounding the water molecules.
The water molecules get carried in the isopropanol in the solution and get evenly dispersed in the solution.
Therefore, water and isopropanol form the solution.
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Answer:
The polar isopropanol molecules are attracted to the polar water molecules at the surface of the water.
✔ 1
The water molecules spread evenly throughout the solution.
✔ 4
The water molecules are carried into the solution.
✔ 3
The isopropanol molecules surround the water molecules.
✔ 2
Explanation:
The polar isopropanol molecules are attracted to the polar water molecules at the surface of the water.
✔ 1
The water molecules spread evenly throughout the solution.
✔ 4
The water molecules are carried into the solution.
✔ 3
The isopropanol molecules surround the water molecules.
✔ 2
Select the correct answer from each drop-down menu. Hydrogen can be created by [ Select ] water. If the activation energy is reduced, hydrogen can be produced with a renewable energy source. This renewable energy source is [ Select ] energy.
Answers
Answer 1) Decomposing Explanation : Hydrogen can be created by decomposing water. Electrolysis which is a method of passing electricity from the water and obtaining the products as hydrogen and oxygen is done by decomposition of water. The water molecule is broken down into its constituents.
Answer 2) Solar energyExplanation :If the activation energy is reduced, hydrogen can be produced with a renewable energy source. This renewable energy source is Solar energy.Solar energy from the sun can be used to lower the energy of activation during the decomposition of water. Solar energy is a renewable energy source as it comes from the sun and is replenish-able unlike fuels which cannot be replenished. The solar energy can be collected and utilized for production of hydrogen.
Tetrachloroethene, C2Cl4 is a solvent used in many dry cleaning processes. Write the empirical formula for tetrachloroethene.
Answers
Answer:
CCl2 is the empirical formula. (the lowest whole-number ratio of the elements)
Explanation:
10. The energy in a spinning ferris wheel
a. Potential energy
b. Kinetic energy
Answers
Answer:
kinetic energy is the right answer
Answer: the answer is B
Explanation: its a spinning Ferris wheel meaning its in motion
How many calories are required to raise 50 g of water 100 degrees celsius?
Pls Help!!!!!
Answers
Answer:
energy known as the latent heat of vaporization is required to break the hydrogen bonds. At 100 °C, 540 calories per gram of water are needed to convert one gram of liquid water to one gram of water vapour under normal pressure.
Explanation:
it was easy
Atoms with different numbers of neutrons in their nucleus are:.
Answers
Answer: They are referred to as isotopes, which are a form of an element that has different numbers of neutrons in their nucleus.
what is the product after the chemical reaction
Answers
Answer: a. 2 C3H7OH + 9 O2 → 6 CO2(g) + 8 H2O(g)
b. C6H12O6 + 6 O2 → 6CO2(g) + 6 H2O(g)
Explanation:
Alcohols and sugars combust or when burned with oxygen forms carbon dioxide and water.
Select all the correct answers. Which sentences describe an advantage of using a hydrogen fuel cell instead of burning fossil fuels?
Answers
Advantages:-
Fossil fuels like methane(Natural gas) on combustion releases carbon dioxide which is a major air pollutant.On the other hand hydrogen fuels don't do pollution much or in negligible amount.So hydrogen fuels are better
Answer:
The reaction of hydrogen and oxygen conveniently takes place inside a fuel cell.
Someday, it may be possible to produce hydrogen fuel using sunlight and water.
The reaction of hydrogen and oxygen doesn’t create products that negatively affect the environment.
Explanation:
PLATO
Sodium bicarbonate (baking soda), NaHCO,, can be purified by dissolving it in
hot water (60 °C), filtering to remove insoluble impurities, cooling to 0 °C to
precipitate solid Nalco, and then filtering to remove the solid, leaving
soluble impurities in solution. Any Nauco, that remains in solution is not?
recovered. The solubility of Nauco, in hot water of 60 °C is 164 g/L. Its
solubility in cold water of 0°C is 69 g/1. What is the percent yield of NaHCO,
when it is purified by this method?
Answers
Answer:
the other person is right
Explanation:
they're also wrong
Answer:
58% or 55.34%
Explanati
Which scientist researched and described the results of genetic crosses?
Question 1 options:
Alfred Wegner
Gregor Mendel
Marie Curie
Santa Clause
Answers
Gregor Mendel researched and described the results of genetic crosses. He is considered the father of genetics.
Who was Gregor Mendel?Gregor Mendel was a botanist who made different genetic crosses using pea plants as a model organism.
Gregor Mendel observed as phenotypic traits were transmitted to the pea descendence in the F1 and F2 generation.
Gregor Mendel developed fundamental laws in genetics such as independent assortment and segregation.
Learn more about Gregor Mendel here:
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the radio waves from your cell phone go through the air and are received by a ??
Answers
Answer:
An antenna
Explanation:
Radio waves are received by antennas
Which organism would have the most variation in the DNA of its offspring
Answers
Answer:
The organism that would have the most variation in the DNA of its offspring is the CAT (i would know). Hope this helped you!
Explain the importance of organisms that convert nitrogen from its diatomic form into other compounds?
Answers
Explanation:
Bacteria play a key role in the nitrogen cycle.
Nitrogen-fixing microorganisms capture atmospheric nitrogen by converting it to ammonia— NH3start text, N, H, end text, start subscript, 3, end subscript—which can be taken up by plants and used to make organic molecules.
Oxygen ENTERS the body through the...
1.The circulatory system
2.The Digestive system
3.The respiratory system
4. The cells in the body
Answers
Answer:
Respiratory System
Explanation:
It connects with the lungs. The oxygen enters the body through the capillaries which are a part of the respiratory system.
Oxygen enters the body thru the respiratory system
Explanation:
Ram's father have 3 childrens first is lina and second is pina who is third
Answers
Answer: Ram
Explanation:
Because as you mentioned in the beginning it is Ram's father
Carlos is making phosphorus trichloride using the equation below. He uses 15. 5 g of phosphorus and collects 50. 9 g of phosphorus chloride. 2P 3Cl2 2PCl3 How much chlorine reacted with the phosphorus? 15. 5 g 17. 7 g 35. 4 g 66. 4 g.
Answers
Answer:
B
Explanation:
If you had a mixture of butyric acid and hexane, how would you separate the two compounds?.
Answers
Answer:
First of all take separatory funnel.
Add the mixture of compounds into it.
Pour Water into it.
Add NaOH base. This will result in following reaction.
CH₃CH₂CH₂COOH + NaOH → CH₃CH₂CH₂COONa + H₂O
The resulting salt (CH₃CH₂CH₂COONa) is is soluble in water.
The water is the bottom layer (more density) and contains sodium butyrate.
Pour out the water from separatory funnel.
The organic layer (hexane) is left behind.
Now, take the aquous layer and neutralize it using HCl.
Once, neutralized remove the water.
Trevor was able to collect what appeared to be blood and sweat from a kitchen counter. What type of evidence does this BEST represent
A. trace evidence
B. biological evidence
C. ammunitions evidence
D. impression evidence
Answers
Answer:
Biological Evidence
Explanation:
Both blood and sweat are fluids within the body, therefore, both are biological substances.
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Why is the production of genetically modified crops considered controversial?
AD
Genetically modified crops may have the same appearance as normal crops.
(В)
Genetically modified crops are less expensive to grow than normal crops.
©
Genetically modified crops may cause unforeseen health consequences.
D
Genetically modified crops can only be grown in warm climates.
Answers
Its the only one that can be considered a controversial issue
Explain how can we apply the phase changes in our life?
Answers
Answer:
Examples of Phase Changes
For example, you have probably witnessed freezing, melting, and vaporization just by making ice, melting ice, and boiling water.
Explanation:
hope it will help you have a great day bye and Mark brainlist if the answer is correct
[tex]kai6417 \: [/tex]
#carry on learning
Explanation:
freezing occurs when are liquid changes to a solid.
melting occurs when a solid changes directly to a liquid
Hey yall any answers
Answers
Answer:
January = 45
May = 80
Explanation:
45 + 8 = 53
53 + 8 = 61
61 + 8 = 69 Round 70
70 + 8 = 78 Round 80
[RevyBreeze]
Answer: i might 45 and 110 because i think that it is adding or something
Explanation: