I WILL GAVE BRAINLIEST FOR CORRECT ANSWER
Use the information to answer the following question.
Hot air balloons use a flame that can turn on and off to heat air inside a large balloon. The balloon is attached to a basket which can carry people or cargo as it is lifted off the ground and floats in the air.
Using what you know about gases, predict which approach would allow the hot air balloon to reach the highest height?
A.
Turn on the flame for 10 seconds each minute for 10 minutes to increase the density of the air inside the balloon.
B.
Turn on the flame for 10 seconds each minute for 2 minutes, and cut a large hole in the balloon material to allow excess air out.
C.
Turn on the flame for 30 seconds each minute for 10 minutes to decrease the density of the air inside the balloon.
D.
Turn on the flame for 30 seconds each minute for 2 minutes, and cut a large hole in the balloon material to allow excess air out.
Answer:
c
Explanation:
Answer:
C. Turn on the flame for 30 seconds each minute for 10 minutes to decrease the density of the air inside the balloon.
Explanation:
Please help
Holmia is the latin word for the swedish city Stockholm, Which element is named for this city?
Answer:
#67 Holmium
Explanation:
holmia + ium = element name
answer with explanation and you get brain list
Answer:
B.
Explanation:
There are the same amount of black circles in the reactant and product. There are also the same amount of white circles in the product and reactant.
How does nitrogen-fixing bacteria make nitrogen available to plants and animals?
Answer:
hi thxs for the points now bye
Answer:
Nitrogen-fixing bacteria in the soil and within the root nodules of some plants convert nitrogen gas in the atmosphere to ammonia. Nitrifying bacteria convert ammonia to nitrites or nitrates. Ammonia, nitrites, and nitrates are all fixed nitrogen and can be absorbed by plants.
Explanation:
Hope It Help
An airplane flew 3043 km from Houston to Seattle in 5.5 hours. What was the average speed, in m/s rounded to the nearest hundredth, of the airplane from Houston to Seattle?
An airplane flew 3043 km from Houston to Seattle in 5.5 hours. What was the average speed, in m/s rounded to the nearest hundredth, of the airplane from Houston to Seattle?
The answer is 553
Answer:
553
Explanation:i did this question today and it was right!
The information shows the masses after the compounds are balanced.
2MgO + 2Cl2 → 2MgCl2 + ?
80g + 140g + 1889 + ?
If the following materials are used during the reaction of magnesium,
oxygen, and chlorine, what mass oxygen would we expect to see after
the reaction and why?
O A. 40g of Oz, because all mass must be conserved, it would be half of the
compound Mgo in the products
O B. 32g of Oz, because all mass must be conserved
c. 32g of Oz, because all mass must be conserved, it would be half of the
compound Mgo in the products
D. 40g of Oz, because all mass must be conserved
32g mass of oxygen would we expect to see after the reaction, because all mass must be conserved.
How we calculate the mass of any substance from moles?
Mass of any substance can be calculated from moles as:
n = W/M, where
n = moles
W = given weight or mass
M = molar mass
Given balanced complete chemical reaction is:
2MgO + 2Cl₂ → 2MgCl₂ + O₂
From the stoichiometry of the reaction it is clear that 2 moles of MgO & Cl₂ is required for the formation of 2 moles of MgCl₂ & 1 mole of O₂. Also the masses of the compound is also given for the balanced reaction as:
Mass of MgO for 2 mole = 80g
Mass of Cl₂ for 2 mole = 140g
Mass of MgCl₂ for 2 mole = 188g
So, it is clear that given masses will show conservation for their standard 1 mole of masses as mass of MgO, Cl₂ & MgCl₂ for 1 mole is 40.3g/mol, 70.90g/mol & 95.2g/mol respectively.
Hence, we conclude that mass for 1 mole of O₂ should be 32g.
Therefore, option (B) is correct i.e. 32g of O₂, because all mass must be conserved.
To know more about mole to mass conversion, visit the below link:
https://brainly.com/question/13314627
Which shape is being shown by the model?
Consider the titration of 40.0 mL of 0.200 M HClO4 by 0.100 M KOH. Calculate the pH of the resulting solution after the following volumes of KOH have been added.
a. 0.0 mL
b. 80.0 mL
c. 10.0 mL
d. 100.0 mL
e. 40.0 mL
Answer:
a) 0.70
b) 7.00
c) 0.85
d) 12.15
e) 1.30
Explanation:
The neutralization reaction involved in the titration is:
HClO₄(aq) + KOH(aq) → KClO₄(aq) + H₂O(l)
According to the chemical equation, 1 mol of HClO₄ reacts with 1 mol of KOH (1 equivalent of acid with 1 equivalent of base). The moles are calculated from the product of the molar concentration (M) and the volume in liters.
We have the following moles of acid (HClO₄):
40.0 mL x 1 L/1000 mL = 0.04 L
0.200 mol/L x 0.04 L = 8 x 10⁻³ moles HClO₄
Since HClO₄ is a strong acid (completely dissociated into H⁺ and ClO₄⁻ ions), the moles of HClO₄ are equal to the moles of H⁺. Then, we can calculate the initial pH:
[H⁺] = 0.200 M → pH = -log [H⁺] = -log (0.200) = 0.70
Now, we calculate the pH after the addition of KOH. Since KOH is a strong base, the concentration of KOH is equal to the concentration of OH⁻ ions.
a) 0.0 mL
No KOH is added, so the pH is the initial pH: 0.70
b) 80.0 mL KOH
80.0 mL x 1 L/1000 mL = 0.08 L
0.100 mol/L x 0.08 L = 8 x 10⁻³ moles KOH = 8 x 10⁻³ moles OH⁻
After neutralization we have:
8 x 10⁻³ moles H⁺ - 8 x 10⁻³ moles OH⁻ = 0
The neutralization reaction is complete and there is no remaining H⁺ from the acid. The concentration of H⁺ is equal to the concentration of H⁺ of water:
[H⁺] = 1 x 10⁻⁷ M → pH = -log [H⁺] = -log (1 x 10⁻⁷) = 7.0
c) 10.0 mL KOH
10.0 mL x 1 L/1000 mL = 0.01 L
0.100 mol/L x 0.01 L = 1 x 10⁻³ moles KOH = 1 x 10⁻³ moles OH⁻
After neutralization we have:
8 x 10⁻³ moles H⁺ - 1 x 10⁻³ moles OH⁻ = 7 x 10⁻³ moles H⁺
The total volume is: V = 40.0 mL + 10.0 mL = 50 mL = 0.05 L
[H⁺] = 7 x 10⁻³ moles/0.05 L = 0.14 → pH = -log [H⁺] = -log (0.14) = 0.85
d) 100.0 mL KOH
100.0 mL x 1 L/1000 mL = 0.1 L
0.100 mol/L x 0.1 L = 0.01 moles KOH = 1 x 10⁻² moles OH⁻
After neutralization we have:
1 x 10⁻² moles OH⁻ - 8 x 10⁻³ moles H⁺ = 2 x 10⁻³ moles OH⁻
The total volume is: V = 40.0 mL + 100.0 mL = 140 mL = 0.14 L
[OH⁻] = 2 x 10⁻³ moles/0.14 L = 0.014 → pOH = -log [OH⁻] = -log (0.014) = 1.84
pH + pOH = 14 → pH = 14 - pOH = 14 - 1.84 = 12.15
e) 40.0 mL KOH
40.0 mL x 1 L/1000 mL = 0.04 L
0.100 mol/L x 0.04 L = 4 x 10⁻³ moles KOH = 4 x 10⁻³ moles OH⁻
After neutralization we have:
8 x 10⁻³ moles H⁺ - 4 x 10⁻³ moles OH⁻ = 4 x 10⁻³ moles H⁺
The total volume is: V = 40.0 mL + 40.0 mL = 80.0 mL = 0.08 L
[OH⁻] = 4 x 10⁻³ moles/0.08 L = 0.05 M → pH = -log [H⁺] = -log (0.05) = 1.30
A 3.42 gram sample of an unknown gas is found to occupy a volume of 1.90 L at a pressure of 547 mm Hg and a temperature of 33 °C. The molecular weight of the unknown gas is ___ g/mol.
2.0 mole of water at STP would occupy what volume?
a) 22.4
b) 22.7
c) 44.8
d) 45.4
plzzz help me
How many moles of H20 are needed to produce 1 mole of O2 in the following equation?
2H2O + 2H2 + 102
6. How have dolphins adapted to undenvater lite
HELP!!!
Answer:
Dolphins have streamlined body shapes that are very hydrodynamic, allowing them to swim fast. Additionally, dolphins have very tight skin and adults have no body hair, both of which help to reduce drag on the marine mammals as they move through the water. Incidentally, dolphins have mated and gone in pairs, and then got more protection.
In which of the following options can competition occur?
b
с
Between two
organisms that are
attempting to use
different resources
that are in short
supply
Between two
organisms that are
attempting to use
the same resource
that is in short
supply
Between two
organisms that are
attempting to use
the same resource
that is in limitless
supply
Answer: no answer
Explanation:
no anwser
define carbon and itz state in which it is found
Answer:
Carbon is a nonmetal which has two mains; diamond and graphite.
Carbon is found in a solid state.
Explanation:
What is the molarity of 2.5 mol of H2SO4 dissolved in 1.00 L of solution?
Need FAST!
Answer:
2.5 M H2SO4
Explanation:
2.5 mol / 1.00 L = molarity of 2.5
Calculate the formula weight or molecular for the following:
a. LiCI
b. SO2 (The 2 is in subscript)
Answer:
42.39, 64.06
Explanation:
Formula Weight can be calculated by adding the atomic mass of the elements in the formula.
LiCl
AM for Li is 6.94 amu, AM for Cl is 35.45 amu
[tex](6.94)+(35.45)=42.39[/tex]
SO₂
AM for S is 32.06 amu, AM for O is 16 amu
[tex](32.06)+2(16.00)=64.06[/tex]
Select the statements that are tru about the role light plays in
this system model.
The half of Earth and the half of the Moon that face the Sun are lit.
Half of the Earth is always it, but the amount of Moon lit changes throughout the month.
Both the Sun and Moon are light sources in this system
The Moon shines as a result of light reflected from the Sun,
Answer:
1st 4 th 5th
Explanation:
what metric unit would be most appropriate to use when measuring the length of a paperclip?
A. millimeter
B. kilometer
C. decimeter
D. centimeter
centimetres
Explanation:
centimetres
Answer:
D. Centimeter is used when measuring the length of a paperclip
which of the following is not a mixture
A. air
B. blood
C. orange juice
D. salt
Energy from the Sun hits Earth
A. everywhere at once, creating uniform temperatures.
B. in only a few places, creating spots of high pressure.
C. evenly, creating layers of uniform climate zones.
D. unevenly, creating areas of high and low pressure.
24. Explain what happens at the particle level when a solid melts.
Answer:
When a solid is heated the particles gain energy and start to vibrate faster and faster. ... At this point the solid is melting to form a liquid. The particles in the liquid are the same as in the solid but they have more energy.
Explanation:
sana maka help
What is the formula for Heptaphosphorous pentoxide?
Answer:
P7F8
Explanation:
correct formula isP7F8
Now run this simulation that demonstrates the properties of gases. The simulation shows a container with a lid on top. The lid can be opened and closed by dragging it left and right. On the left side of the container is a yellow handle. Drag this handle right or left to decrease or increase the volume of the container. On the top right of the container are a thermometer and a pressure gauge. Follow these steps to use the simulation, and then answer the question that follows. 1. Reduce the container to its least volume by dragging the yellow handle as far right as you can. 2. In the Gas in Chamber menu, add 80 molecules of heavy species to the container. 3. In the Constant Parameter menu, select Pressure. 4. Increase the number of heavy species molecules to 200. What do you observe when the molecules are increased from 80 to 200 at constant pressure?
link http://contentstore.ple.platoweb.com/content/sharedmedia/phet_sims_batch2/gas-properties/gas-properties_en.html
Answer:
The pressure will increase linearly if you increase the moles/molecules of gas
Explanation:
A gas occupies 5.31 liters at a pressure of 0.55 atm. Determine the volume at standard pressure.
A. 2.92
B. 8.28L
C. 3.54 L
D. 9.65L
Answer:
Option A; V = 2.92 L
Explanation:
If we assume a lot of things, like:
The gas is an ideal gas.
The temperature is constant.
The gas does not interchange mass with the environment.
Then we have the relation:
P*V = n*R*T = constant.
Where:
P = pressure
V = volume
n = number of moles
R = constant of the ideal gas
T = temperature.
We know that when P = 0.55 atm, the volume is 5.31 L
Then:
(0.55 atm)*(5.31 L) = constant
Now, when the gas is at standard pressure ( P = 1 atm)
We still have the relation:
P*V = constant = (0.55 atm)*(5.31 L)
(1 atm)*V = (0.55 atm)*(5.31 L)
Now we only need to solve this for V.
V = (0.55 atm/ 1 atm)*(5.31 L) = 2.92 L
V = 2.92 L
Then the correct option is A.
If only 15 moles oxygen are available, how many moles of methane will burn?
Answer: 15mol O2 x 1mol CH4 / 2mol O2 = 7.5 mol CH4
Answer: 7.5 mol
Explanation:
What do these two changes have in common? Shaking up salad dressing. Adding dish soap to water in a sink
Match it, I’m not sure which category they go in
Answer:
Endothermic is something that needs heat added into it, while exoteric gives heat off
Explanation:
1. Endo(Melting ice)
2. Endo(heat enters the system)
3. Exothermic(making ice)
4. Endothermic( liquid to gas)
5. Exothermic(campfire)
6. exothermic(gas to a liquid)
7. Exothermic (the flame of a candle)
8. Exothermic (heat leaves the system)
9. I don’t know if photosynthesis is exo or endothermic
Write the electron configuration for . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.)
The given question is incomplete. The complete question is:
Write the electron configuration for [tex]Ca^+[/tex] . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for [tex]Ca^{2+}[/tex] . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for [tex]Se^{2-}[/tex] . (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.) Write the electron configuration for [tex]S^{2-}[/tex]. (Express your answer as a series of orbitals, in order of increasing orbital energy. For example, the electron configuration of Li would be entered as 1s22s1 or [He]2s1.)
Answer:
[tex]Ca^+:19:[Ar]4s^1[/tex]
[tex]Ca^{2+}:18:[Ar][/tex]
[tex]Se^{2-}:32:[Ar]3d^{10}4s^24p^2[/tex]
[tex]S^{2-}:18:[Ar][/tex]
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The electrons are filled according to Afbau's rule in order of increasing energies. The positively charged species are formed by loss of electrons and negatively charged species are formed by gain of electrons.
[tex]Ca:20:[Ar]4s^2[/tex]
[tex]Ca^+:19:[Ar]4s^1[/tex]
[tex]Ca^{2+}:18:[Ar][/tex]
[tex]Se:34:[Ar]3d^{10}4s^24p^4[/tex]
[tex]Se^{2-}:36:[Ar]3d^{10}4s^24p^6[/tex] or [tex]Se^{2-}:36:[Kr][/tex]
[tex]S:16:[Ne]3s^23p^4[/tex]
[tex]S^{2-}:18:[Ne]3s^23p^6[/tex] or [tex]S^{2-}:18:[Ar][/tex]
thats ridiculously ridiculous
Answer: beautiful
Explanation:
AIDS is one disease caused by a virus infection. The virus attacks immune system cells known as T cells.
Based on your observations from the Gizmo, how would you explain the data shown on this graph?
Answer:
yes,its true
Explanation:
I just want to say first off
the immune cell known as T cell also known as white blood cells
Since the first main attack from the bodies response against a virus is deploying T cells to attack
CD4 cells are the basic T cells and HIV virus which is AIDS will start to "Eat itself inside" Ofc not they will use protein spikes to form their way in
they start to create copies of themselves inside the T cell itself and creating a new protein called Env to form their ways in ofc
They are able to bypass CD4 cells is because its a basic cellular receptor for T cells making them really deadly
They now will start to attack other white cells and deploying more and more of their virus cells