Answer:
B) Crust
Explanation:
It's the farthest layer from the core listed.
Answer:
B) Crust
Explanation: it is the lowest from the center of the earth.
Write a balanced equation for the following:
1. P4 + O2 → P2O5
2. C3H8 + O2 → CO2 + H2O
3. Ca2Si + Cl2 → CaCl2 + SiCl4
(ANS1)— P4 + 5O2 ---> 2P2O5
(ANS2)— C3H8 + 5O2---> 3CO2 + 4H20
(ANS3)— Ca2Si + 4Cl2 ---> 2CaCl2 + SiCl4
Answer:
(ANS1)— P4 + 5O2 ---> 2P2O5
(ANS2)— C3H8 + 5O2---> 3CO2 + 4H20
(ANS3)— Ca2Si + 4Cl2 ---> 2CaCl2 + SiCl4
Explanation:
How many molecules are in 8.78 moles of oxygen gas
Answer:
11 g
Explanation:
Can someone please explain what to do it’s late at night and I need sleep but I forgot I had this homework please help me with a few questions I’m desperate :(
Answer:
1) it takes 13 second
2) 2100 miles
3) 40 miles / hours
4) 730 meters
A sample of neon gas at 52°C and a volume of 2.5 liters is cooled to 25°C. Calculate the new volume of the neon.
The new volume of the neon gas as its temperature is reduced is 2.29L.
Charles's lawCharles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
V₁/T₁ = V₂/T₂
Given the data in the question;
Initial temperature of gas T₁ = 52°C = 325.15KInitial volume of gas V₁ = 2.5LFinal temperature T₂ = 25°C = 298.15KFinal volume V₂ = ?To determine the new volume of the neon gas, we substitute our given values into the expression above.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂ / T₁
V₂ = ( 2.5L × 298.15K ) / 325.15K
V₂ = 745.375LK / 325.15K
V₂ = 2.29L
Therefore, the new volume of the neon gas as itstemperature is reduced is 2.29L.
Learn more about Charles's law here: brainly.com/question/12835309
A sample of Xe gas is observed to effuse through a pourous barrier in 4.83 minutes. Under the same conditions, the same number of moles of an unknown gas requires 2.29 minutes to effuse through the same barrier. The molar mass of the unknown gas is _____ g/mol.
Answer:
28.93 g/mol
Explanation:
This is an extension of Graham's Law of Effusion where [tex]\frac{R1}{R2} = \sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]
We're only talking about molar mass and time (t) here so we'll just concentrate on [tex]\sqrt{\frac{M2}{M1} } = \frac{t2}{t1}[/tex]. Notice how the molar mass and time are on the same position, recall effusion is when gas escapes from a container through a small hole. The time it takes it to leave depends on the molar mass. If the gas is heavy, like Xe, it would take a longer time (4.83 minutes). If it was light it would leave in less time, that gives us somewhat an idea what our element could be, we know that it's atleast an element before Xenon.
Let's plug everything in and solve for M2. I chose M2 to be the unknown here because it's easier to have it basically as a whole number already.
[tex]\sqrt{\frac{M2}{131} } = \frac{2.29}{4.83}[/tex]
The square root is easier to deal with if you take it out in the first step, so let's remove it by squaring each side by 2, the opposite of square root essentially.
[tex](\sqrt{\frac{M2}{131} } )^2= (\frac{2.29}{4.83})^2[/tex]
[tex]{\frac{M2}{131} } = (0.47)^2[/tex]
[tex]{\frac{M2}{131} } = 0.22[/tex]
M2= 0.22 x 131
M2= 28.93 g/mol
5. A gas has a pressure of 310 kPa at 237 degrees C.
What will its pressure be at 23 degrees C?)
Answer:
The pressure of the gas at 23 C is 179.92 kPa.
Explanation:
Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.
Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T} =k[/tex]
Studying two states, one initial 1 and the other final 2, it is satisfied:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 310 kPaT1= 237 C= 510 K (being 0 C= 273 K)P2= ?T2= 23 C= 296 KReplacing:
[tex]\frac{310 kPa}{510 K} =\frac{P2}{296 K}[/tex]
Solving:
[tex]P2=296 K*\frac{310 kPa}{510 K}[/tex]
P2= 179.92 kPa
The pressure of the gas at 23 C is 179.92 kPa.
(c) Write the balanced neutralization reaction and calculate the volume in mL of a 1.420 M NaOH solution required to titrate 25.00 mL of a 5.400 M H2SO4 solution
Answer:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
190.14 mL of the NaOH solution would be required.
Explanation:
The balanced reaction is:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂ONow we calculate how many H₂SO₄ moles are there in 25.00 mL of a 5.400 M solution, using the definition of molarity:
Molarity = moles / litersMoles = Molarity * liters25.00 mL * 5.400 M = 135 mmol H₂SO₄Now we convert H₂SO₄ moles into NaOH moles, using the stoichiometric coefficients of the balanced reaction:
135 mmol H₂SO₄ * [tex]\frac{2mmolNaOH}{1mmolH_2SO_4}[/tex] = 270 mmol NaOHFinally we calculate the volume of a 1.420 M solution that would contain 270 mmoles:
Molarity = moles / litersliters = moles / molarity270 mmol / 1.420 M = 190.14 mLWhich of the following groups of chemical elements would you expect to
be most alike in their physical and chemical properties?
A. Chromium, rhodium, zinc, silicon
B. Magnesium, strontium, radium, barium
C. Lithium, beryllium, boron, oxygen
D. Sulfur, selenium, chlorine, krypton
Answer: B. Magnesium, strontium, radium, barium
Explanation:
Elements are distributed in groups and periods in a periodic table.
Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.
Magnesium (Mg) , Strontium (Sr) , Radium (Ra) and Barium (Ba) are elements which belong to Group 2. They have 12, 38, 88 and 56 electrons respectively and contain 2 valence electrons each and need one electron to complete their octet.
The chemical reactivity of elements is governed by the valence electrons present in the element and thus they are alike in physical and chemical properties.
Why do people who exercise more produce more carbon dioxide ?
Answer:
When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide.
Explanation:
Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
What is exercise?Exercise is characterized as a physiological movement that maintains or enhances total physical wellness. People who exercise are less likely to get diseases and to maintain a healthy weight. Type 2 diabetes, heart disease, high blood pressure, and weight gain can all be warded off with regular exercise. Leaping, jogging, or lifting weights are examples of exercises that can support bone health.
The lungs both provide the body with oxygen, which gives you energy, and remove carbon dioxide from the system, which is a byproduct of energy production. The heart pumps oxygen-rich blood to the working muscles. Because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
Thus, because your muscles are working harder when you exercise, your body requires more oxygen and produces more carbon dioxide.
To learn more about exercise, refer to the link below:
https://brainly.com/question/13128077
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What is the change in electrons for sulfur in the following
reaction?
SO2 (aq) + Cr2O7^2-(aq) -> SO4^2- (aq) + Cr^3+ (aq)
A. Gain 3 electrons
B. Gain 5 electrons
C. Lose 2 electrons
D. Lose 1 electron
Answer:
Sulfate loses 2 electrons to sulphur dioxide.
PLEASE ANSWER ILL GIVE BRAINLY ASAP!!! A student stands in exactly the same location facing north at different times throughout the day. She also observes the suns position in the sky. She draws the following diagram to show what she observed. PLEASE SHOW A DRAWING ON THE RESULTS
Answer:i do not get it
Explanation:
what element has the same amount of valence electrons as neon?
-KDM
Answer:
Sulfur has the same amount, like all the other elements in group 16, has six valence electrons.
Explanation:
Answer:
give me the question and I can help you
Select all the correct answers.
The dumping of garbage caused the population of crabs in an area to drop from 2,000 to 500. Crabs eat algae and are preyed on by larger fish.
How will the crab's population change affect these two specles?
O
Food and space will be equally distributed among the three species.
. The population of predatory fishes will change.
O The biodiversity of the ecosystem will decrease.
. The algal population will Increase.
O The algal population will decrease.
Answer:
The population of predatory fishes will change.
The biodiversity of the ecosystem will decrease.
Explanation:
Answer:
The population of predatory fishes will change.
The biodiversity of the ecosystem will decrease.
Explanation:
Im on the edmentum mastery test.
what are the mixtures of chemistry
What type of plate boundary is
shown in the diagram below?
Which is not a critical part of collision theory?
orientation
energy
amplification
collisions
Answer:
Amplification
Explanation:
4.What type of energy is used to fuel the process of photosynthesis and what type is produced in
respiration?
A Light energy is used in photosynthesis and created by respiration.
B ATP is used in photosynthesis, which allows the plant to undergo respiration.
C Light energy is used in photosynthesis, whereas respiration creates the energetic product, ATP.
D Food energy is used in photosynthesis and ATP is produced in respiration.
Answer:
A. light energy is used in photosynthesis and created by respiration
calcium + nitrous acid → calcium nitrite
+
nitrogen monoxide
+ water
Answer:
It is double displacement reaction
BRAINLIESTTTT
If a solution has pOH of 5.2 the pH of the solution is?
A. 0.17
B. 5.2
C. 6x10-6
D. 8.8
Answer:
D 8.8
Explanation:
To solve this question you must know that, using the kw equation:
Kw = 1x10⁻¹⁴ = [H⁺] [OH⁻]
-log 1x10⁻¹⁴ = -log ([H⁺] [OH⁻])
14= -log [H⁺] + -log [OH⁻]
As pH = -log[H⁺] and pOH = -log [OH⁻]
we can obtain the equation:
pH = 14 - pOH
As the pOH of the solution is 5.2:
pH = 14 - 5.2
pH = 8.8
Right option is:
D 8.8How many moles of helium are inside a 7.3 L party balloon at STP?
Answer:
0.326 mol. is the answer.
Explanation:
No. of moles = Volume (L) / Volume at STP
N = 7.3 / 22.4
N = 0.326 moles
1)
Two locations, one in northern Canada and one in the southwestern United States, receive
the same amount of precipitation each year. The location in Canada is classified as a humid
climate. Why would the location in the United States be classified as an arid climate?
A)
The soil-moisture storage in the southwestern United States is more than that in northern
Canada.
B)
The vegetation of the southwestern United States is different from that of northern
Canada,
C)
The potential evapotranspiration is greater in the southwestern United States than in
northern Canada
D)
The yearly distribution of precipitation is different.
If the hydroxide concentration of a solution is
[OH-] = 4.67 X 10-8
what would the pH of that solution be?
Answer:
ty
Explanation:
ytMatches=from Chemical energy to light energy+heat energy
Explanation:
A matchstick has a lot of chemical energy stored in it. When the match is struck, it burns and the chemical energy in it produces heat energy and light energy.
brainliest and follow and thanks
please help :(.
Which is true about scientific theories?
Answer:
b
Explanation:
i think its b because theories are usually developed after many experiments/tests by different scientists. at least i think so lol i dont remember too much from biology
Climate change is ONLY caused by human activities
OTrue
O False
Answer:
That is False
Explanation:
That is false because climate change happen due to Wind, rainfall etc
In a _____ molecules move just enough to stay close together but not to stick
Answer:
I think it might be liquid
Answer: in a molecular molecules move just enough to stay close together but not to stick
Explanation:
PLEASE HELP ME OUT. I AM REALLY LOST AND I JUST NEED THIS LAST QUESTION I WILL BE GRATEFUL AND WILL GIVE BRANLIEST!
PLEASE HELP ME OUT. I AM REALLY LOST AND I JUST NEED THIS LAST QUESTION I WILL BE GRATEFUL AND WILL GIVE BRANLIEST!
Explanation:
—COOH and —NH₂
Carboxylic Acid and Amino group
-TheUnknownScientist
draw Fischer projection for L-ketononose
Answer: acttachec pic
The last carbon have the H on there, forgot to put it in :)
The Fischer projection of L-ketononose is:
H
|
CH₂OH-C=O-H
|
C
|
CH₂OH
Fischer projection is a two-dimensional representation of a three-dimensional molecule. In Fischer projection, the carbon atoms are drawn as vertical lines, and the hydrogen atoms and hydroxyl groups are drawn on the right-hand side or left-hand side of the carbon atoms. The carbonyl group is always drawn at the top of the Fischer projection.
The L-configuration is a type of configuration that is assigned to organic molecules based on the orientation of the hydroxyl group on the penultimate carbon atom. If the hydroxyl group is on the left-hand side of the Fischer projection, the molecule is assigned the L-configuration. If the hydroxyl group is on the right-hand side of the Fischer projection, the molecule is assigned the D-configuration.
In the Fischer projection of L-ketononose, the hydroxyl group on the penultimate carbon atom is on the left-hand side, so the molecule is assigned the L-configuration.
To learn more about Fischer projections, here
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I have a question for us gals, is it hard for all of you when you try to get your crushes attention and he/she just keeps ignoring you to the point where you could just give up?
Answer:
Yes it is hard. For some of us. I already gave up, but now hes coming back. Id say sometimes its useless to get his attention if he never even pays attention to you anyways. It sucks because its so hard to get then to notice you for once.
Explanation:
which metal is the most easily oxidized?
A. highly active metal
B. moderately active metal
C.slightly active metal
D.an inactive metal
Answer:
B. Moderately active metal
Explanation:
