Answer:
Mass of water produced is 22.86 g.
Explanation:
Given data:
Mass of hydrogen = 2.56 g
Mass of oxygen = 20.32 g
Mass of water = ?
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of oxygen:
Number of moles = mass/ molar mass
Number of moles = 20.32 g/ 32 g/mol
Number of moles = 0.635 mol
Number of moles of hydrogen:
Number of moles = mass/ molar mass
Number of moles = 2.56 g/ 2 g/mol
Number of moles = 1.28 mol
Now we will compare the moles of water with oxygen and hydrogen.
O₂ : H₂O
1 : 2
0.635 ; 2×0.635 = 1.27
H₂ : H₂O
2 : 2
1.28 : 1.28
The number of moles of water produced by oxygen are less thus it will be limiting reactant.
Mass of water produced:
Mass = number of moles × molar mass
Mass = 1.27 × 18 g/mol
Mass = 22.86 g
Answer:
22.88
Explanation:
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Answer:
D. Atom, Electron, and Proton
Explanation:
Because Atoms are the smallest and they make up everything.
because the Proton, stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10−27 kg, which is 1,836 times the mass of an electron.
Answer:
C
Explanation:
Electrons are the smallest part of matter. Protons are bigger than electrons. And the whole atom is bigger than everything inside it.
15.0 L of an ideal gas at 298 K and 3.36 bar are heated to 350 K with a new pressure of 4.40 atm. What is the new volume in litres?
Answer:
13.3 L
Explanation:
Step 1: Given data
Initial pressure (P₁): 3.36 barInitial volume (V₁): 15.0 LInitial temperature (T₁): 298 KFinal pressure (P₂): 4.40 atmFinal volume (V₂): ?Final temperature (T₂): 350 KStep 2: Convert P₁ to atm
We will use the conversion factor 1 atm = 1.01325 bar.
3.36 bar × (1 atm / 1.01325 bar) = 3.32 atm
Step 3: Calculate V₂
We will use the combined gas law.
P₁ × V₁/T₁ = P₂ × V₂/T₂
V₂ = P₁ × V₁ × T₂/T₁ × P₂
V₂ = 3.32 atm × 15.0 L × 350 K/298 K × 4.40 atm
V₂ = 13.3 L
What is the powerhouse of the cell?
Answer:
Mitochondria is the powerhouse of the cell, but don't let this distract you from the fact that Mr. Krabs sold SpongeBob's soul for 62 cents
Answer:
mitochondria
Explanation:
Which of the following always combines in definite proportions?
a. compound
b. homogeneous mixture
c. element
d. heterogeneous mixture
Answer:
The answer is heterogeneous mixture
10. Explain the relationship between the group number and the valence electrons
of MAIN GROUP elements (Groups 1, 2, 13-18). *
Valence electrons are electrons that are in the outermost orbitals of an atom. In the periodic table the elements are divided into groups. All elements of the first main group have one valence electron. All elements of the second main group have two valence electrons. And so on:
group 1 - 1 valence electrongroup 2 - 2 valence electronsgroup 13- 3 valence electronsgroup 14 - 4 valence electronsgroup 15 - 5 valence electronsgroup 16 - 6 valence electronsgroup 17 - 7 valence electronsgroup 18 - 8 valence electronsConsider a cylinder of a gasoline engine at the beginning of the compression cycle, during which a fuel/air mixture (for our purposes mostly composed of nitrogen and oxygen, i.e. an ideal gas of diatomic molecules) at 300 K and 1 bar is compressed down to one-tenth volume (compression ratio of 10:1). Assume that the compression is rapid so no heat exchange occurs with the environment. Calculate the pressure and the temperature of the compressed gas. In a diesel engine the compression ratios are typically much higher; redo the same calculation with the compression ratio of 20:1.
Answer:
(i) Final pressure and temperature are 25.119 bar and 753.566 K, (ii) Final pressure and temperature are 66.289 bar and 994.336 K.
Explanation:
This system experiments an adiabatic compression, as such compression happens with no heat interaction between the piston-cylinder device and surroundings. This is a particular case of polytropic process, in which there is no entropy generation according to the Second Law of Thermodynamics.
The compression process is represented by the following formulas:
[tex]\frac{p_{2}}{p_{1}} = \left(\frac{V_{1}}{V_{2}} \right) ^{\gamma}[/tex] (Eq. 1)
[tex]\frac{T_{2}}{T_{1}} = \left(\frac{V_{1}}{V_{2}} \right)^{\gamma - 1}[/tex] (Eq. 2)
Where:
[tex]p_{1}[/tex], [tex]p_{2}[/tex] - Initial and final pressures, measured in bar.
[tex]T_{1}[/tex], [tex]T_{2}[/tex] - Initial and final temperatures, measured in Kelvins.
[tex]V_{1}[/tex], [tex]V_{2}[/tex] - Initial and final volumes, measured in cubic meters.
[tex]\gamma[/tex] - Specific heat ratio of air, dimensionless.
From Theory of Diesel and Otto Cycles we know that compression ratio is defined as:
[tex]r_{c} = \frac{V_{1}}{V_{2}}[/tex] (Eq. 3)
And (Eqs. 1, 2) can be rewritten as follows:
[tex]\frac{p_{2}}{p_{1}} = r_{c}^{\gamma}[/tex] (Eq. 1b)
[tex]\frac{T_{2}}{T_{1}} = r_{c}^{\gamma - 1}[/tex] (Eq. 2b)
Then, we clear final pressure and pressure in each expression and calculate them for each case:
[tex]p_{2} = p_{1}\cdot r_{c}^{\gamma}[/tex]
[tex]T_{2} = T_{1}\cdot r_{c}^{\gamma-1}[/tex]
(i) [tex]r_{c} = 10[/tex], [tex]p_{1} = 1\,bar[/tex], [tex]T_{1} = 300\,K[/tex], [tex]\gamma = 1.4[/tex]
[tex]p_{2} = (1\,bar)\cdot 10^{1.4}[/tex]
[tex]p_{2} = 25.119\,bar[/tex]
[tex]T_{2} = (300\,K)\cdot 10^{0.4}[/tex]
[tex]T_{2} = 753.566\,K[/tex]
Final pressure and temperature are 25.119 bar and 753.566 K.
(ii) [tex]r_{c} = 20[/tex], [tex]p_{1} = 1\,bar[/tex], [tex]T_{1} = 300\,K[/tex], [tex]\gamma = 1.4[/tex]
[tex]p_{2} = (1\,bar)\cdot 20^{1.4}[/tex]
[tex]p_{2} = 66.289\,bar[/tex]
[tex]T_{2} = (300\,K)\cdot 20^{0.4}[/tex]
[tex]T_{2} = 994.336\,K[/tex]
Final pressure and temperature are 66.289 bar and 994.336 K.
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Answer:
Its B
Explanation:
When testing with the human body i think
Which of the following is the best description of matter?
Answer:
description of matter:
Matter is everything around you. Atoms and compounds are all made of very small parts of matter. Those atoms go on to build the things you see and touch every day. Matter is defined as anything that has mass and takes up space (it has volume).
please give me brainliest if I answered you question correctly
An obligation to do something or control over or care for someone.
Answer: a responsibilty
Explanation:
An obligation to do something or control over or care for someone. The word suitable for it is "responsibility".
An obligation is a duty or responsibility to do anything that is required by law, custom, or moral standards.
Responsibility is an obligation to do something or control over or care for someone. It is a duty or task that one is required to undertake.
Responsibility can be of different forms, such as personal, social, or professional.
Personal responsibility refers to the responsibility that an individual has for their own actions and decisions.
Social responsibility refers to the responsibility that an individual or organization has to act in the best interest of society.
Professional responsibility refers to the responsibility that individuals have to perform their job duties to the best of their ability.
Therefore, the term most suits for the given statement is "responsibility".
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g The free energy change of the reaction A (g) ---> B(g) is zero under certain conditions. The STANDARD Free energy change of the reaction is -42.5 kJ. Which of the following statements must be true about the reaction described here? A) The concentration of the product is greater than the concentration of the reactant. B) The reaction is at equilibrium. C) The concentration of the reactant is greater than the concentration of the product.
Answer:
The reaction is at equilibrium.
Explanation:
In thermodynamics, the Gibbs free energy is a term used traditionally to refer to the available or useful work that can be obtained from a thermodynamic system.
Gibbs free energy is a measure of the chemical potential that a reaction has left to do work. Hence, if the free energy is zero, then the reaction has attained equilibrium, and there is no more work to be done
The statement that should be true related to the reaction should be that it should be at equilibrium.
What is Gibbs free energy?In terms of thermodynamics, this energy should be applied for the availability or the useful work that should be obtained via the system of thermodynamics.
Also, it determined the chemical potential where the reaction has left for doing the work. Also in the case when the free energy should be zero so here the reaction should be attained the equilibrium.
hence, the option b is correct.
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what is displacement give two examples
Explanation:
nothing it is just a question. you should know the answer . example:you,
Which type of investigation is based on observation?
Answer:
Quantitative Observations
Explanation:
With regard to Lewis structures, what is the importance of the octet rule?A. Orbitals fill one electron at a time.
B. All elements contain eight electrons at all times.
C. Elements with less than eight valence electrons are reactive.
D. No more than two electrons can share an orbital.
The early periodic table grouped elements based on similar properties. Which element would be grouped with sodium using this principle.
A. Magnesium
B. Zinc
C.Potassium
D. Sulfur
Answer:
C.Potassium
Explanation:
As we know that Potassium is a mineral also at the same time it is an electrolyte. It helps for muscles work involves the muscles so that the heartbeat and breathing could be controlled.
Now as per the periodic table on an early basis that depends upon the similar properties so the element that should be grouped with the sodium is Potassium
hence, the option c is correct
According to the early periodic table the element that has been grouped together with Na has been Potassium. Thus, option C is correct.
The early periodic table has been consisted of the elements that has been arranged based on the increasing order of the atomic mass. The grouping of the elements has been performed based on the similarities with the elements.
The sodium has been the electrolyte that has been responsible for maintaining the electrolyte balance in the human body. The sodium has been the smaller size element with being highly reactive.
The element that has also been small size with high reactive, and has been able to maintain the body electrolyte balance has been Potassium.
Thus, according to the early periodic table the element that has been grouped together with Na has been Potassium. Thus, option C is correct.
For more information about the early periodic table, refer to the link:
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A ________________ causes a __________________ heat transfer rate.
Answer:
A smaller temperature difference causes a smaller heat transfer
Explanation:
The greater the temperature difference, the greater the rate at which heat transfers.
Is crumbling a cookie, a physical change? Explain why. My child is having problems with this question, and I'm not so sure how to explain it.
Answer:
Because the sugar flour and eggs can no longer be separated. The properties of the materials have changed so it's a chemical change
Sugar, flour, and eggs cannot be separated. The materials' properties have changed, resulting in a chemical change.Therefore, crumbling a cookie is not a physical change.
What is physical change ?Physical changes affect a chemical substance's form but not its chemical composition. Physical changes can be used to separate mixtures into their component compounds, but not to separate compounds into chemical elements or simpler compounds.
A chemical change is the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances. It occurs when one substance reacts with another to form a new substance.
A physical change is characterized by a change in physical properties. Melting, transition to a gas, change in strength, change in durability, changes in crystal form, textural change, shape, size, colour, volume, and density are all examples of physical properties.
Thus, crumbling a cookie is not a physical change.
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Where is ionization energy highest on the periodic table?
What type of gases would be in the top right?
Ionization levels are most highest on the top right side of the Periodic Table. The type of gases that would be in the top right are noble gases, like helium, and other common noble gases.
Hope this answer helps you!
The diagram below shows a lithium atom. Which of the following correctly lists the particles in a lithium atom? *
Captionless Image
A. 3 protons, 4 neutrons, 3 electrons
B. 3 protons, 3 neutrons, 4 electrons
C. 4 protons, 4 neutrons, 3 electrons
D. 4 protons, 3 neutrons, 4 electrons
7. Baking soda is a common household chemical compound. The chemical formula
NaHCO3 represents the matter needed to produce baking soda. Baking soda is
considered a compound because. WILL GIVE BRAINLIST
How many electrons are in the highest occupied energy level, n, of an element in Group 15?
Answer:
5 Electrons.
Explanation:
Hello.
In this case, an element in group 15 such as nitrogen has 5 electrons on the outer shell because of its electron configuration. For N, whose atomic number is 7, the electron configuration is:
[tex]N^7: 1s^2,2s^2,2p^3[/tex]
Whereas energy level 2 has 5 electrons (2 from 2s and 3 from 2p). Next element is phosphorous and its electrons configuration is:
[tex]P^{15}:1s^2,2s^2,2p^6,3s^2,3p^3[/tex]
It also has 5 electron on the energy level 3 (2 from 3d and 3 from 3p).
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Jack was playing with a toy car and a track that records velocity over time using sensors and it generated the graph below:
At which points on the graph is the car showing acceleration?
Group of answer choices
Sections a, c, and d
Sections a, b, c, and d
Sections a and d
Section a only
Answer:
a,c, and d
Explanation:
if velocity is not a flat line, that means there is acceleration, whether it is positive or negative acceleration.
Calculate the number of atoms in a 3.68×103 g sample of aluminum.
Answer:
84.23×10^23
Explanation:
no.of atoms =given wt / gram Mw×avagdro num
Which of the following is least like the others on the list?
a. Estrogen
b. Cholesterol
c. Glycogen
d. Triglyceride
Answer:
Glycogen
Explanation:
a,b,d are lipidic and glycogen is glucide
what is extraction .....???
Answer:
Extraction is the action of removing something.
Explanation:
Macon is 50 miles away from Atlanta. If it takes Jim one hour to drive from Macon to Atlanta on Monday but takes him an hour and a half on Tuesday, what happened to his speed?
Group of answer choices
It decreased
It increased
It averaged out to the same speed
It stayed the same because the distance stayed the same
Answer:
it decreased
Explanation:
the distance stayed the same, and if it takes him longer to get somewhere than it did another day, it would mean his speed decreased.
When you add milk, sugar and coffee to a cup of hot water, which of these explain that what you formed in a mixture?
A new substances is formed B. You can no longer taste the sugar
C. You can still taste the bittemess of the coffee, the sweetness of the sugar and the creaminess of the milk
D. Each of the part of the mixture changed in color, amount in taste
Answer:
I think it's D. Please let me know if it's wrong or right.
Explanation:
A venus fly trap snaps shut when a fly lands on the trigger hairs inside its trap.
Which characteristic of life does this represent?
reproduction
A. cell organization
B. heredity
C. response to environment
Answer:
C. Response to environment
Which of the following are properties of substances with matter? (2 points)
a
Mass and volume
b
Length and width
c
Shape and color
d
Size and texture
The difference between the two types of succession !!!??!?
Answer:
Hope it help you
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Explanation:
Primary succession is the series of community changes which occur on an entirely new habitat which has never been colonized before. For example, a newly quarried rock face or sand dunes. Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat.
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Question 4 (1 point)
Neon gas is often used to make signs for restaurants and businesses. However, neon only accounts
for 0.0018% of Earth's atmosphere. Scientists are looking for other elements that have similar
properties as neon that could be used as a substitute. Which of the following elements would most
likely be a good substitute?
Oь
Argon
Flourine
Chlorine
Oxygen
d
Submit
Submit
Answer:
Argon
Explanation:
The element that would most likely be a good substitute for neon is "argon".
These two elements belong to the noble gases in Group 18(8A) of the Periodic Table. They are inert gases - they do not react chemically with other substances.
Argon, as an inert gas is often used whenever an inert atmosphere is needed. Argon is used in incandescent light bulbs. It is used to stop oxygen from corroding the filament. It is also used by welders to protect weld area.
Argon is a good substitute for neon in this context because they possess some physical properties which are similar.
