Answer:
I dont get what you need help with
Explanation:
Answer:
i dont get what your supposed to do either
What happens to the air as a stove heats it? This question is about thermal expansion and convection, not “it gets hot”.
20 points for answering
Answer:
When there is heat at the bottom of this air or water, the air or water molecules in contact with the heat start to move, and the molecules spread apart. The heated air or water becomes less dense. It rises up until it gets to air or water with the same density as it has, and when it gets there, it pushes the air or water that was there out of the way. At the same time, new air or water fills the space that was vacated when the heated molecules rose up. The air or water that gets pushed out of the way falls down. This sets up a circular motion. Air or water is heated at the bottom, travels to the top, cools, gets denser, falls, is heated again and the whole cycle starts again. Convection does not occur in space because there is no gravity. Ovens work by convection. The heating coils at the bottom of the oven heat the air which climbs to the top, cools slightly, and falls down again.
Explanation:
Why does lowering the pressure cause a liquid to boil?
A. It becomes easier for molecules to escape.
B. It pushes molecules out of the liquid.
C. It causes the temperature to rise.
D. It changes the volume of the liquid.
Lowering the pressure in a container will cause the liquid in the container to boil faster because it becomes easier for the molecules to escape.
What causes boiling?Boiling happens when the vapor pressure of a liquid equals the atmospheric pressure.
By lowering the atmospheric pressure, the vapor pressure of a liquid takes a lower time to equal the atmospheric pressure.
Thus, it becomes easier for the molecules of the liquid to escape from each other.
More on boiling and pressure can be found here: https://brainly.com/question/2510654
Explain why the elements in group 7 have 7
valence electrons.
Answer:
The periodic table was made that way by the scientists who created it
Explanation:
to make things easier for the users.
Which of the following is not a part of the digestive system
A. Mouth
B.Esophagus
C.Intestines
D.Kidneys
Answer:
Kidneys •_•
Hope this helped <3
Convert 8.00 x 1020 molecules of H2 to moles.
Answer:
1.33 x 10^-3 mol H2
Explanation:
? mol H2 = 8.00 x 1020^20 molecules H2 x 1 mol H2/6.02 ! 1023 molecules H2 = 1.33 x 10^-3 mol H2
Hope that helps!
8.00 x 10²⁰ molecules of H₂ present in 1.33 x 10⁻³ mole of H₂.
What is mole?Mole is used to define the amount of quantity of any substance and 1 mole equals to the 6.023 × 10²³ elementary entities or atoms in it.
According to the question:
1 mole of H₂ = 6.023 × 10²³ molecules of H₂
or 1 molecules of H₂ = 1 mole of H₂ / 6.023 × 10²³ molecules of H₂
To convert 8.00 x 10²⁰ molecules into mole we calculate as follow:
x mole of H₂ = (8.00 x 10²⁰ molecules x 1 mole of H₂) / 6.023 × 10²³ molecules
x mole = 1.33 x 10⁻³ mole
Hence, 1.33 x 10⁻³ mole of H₂ consist 8.00 x 10²⁰ molecules.
To know more about moles, visit the below link:
https://brainly.com/question/15356425
How do you know when a redox equation is balanced?
An initial mixture of nitrogen gas and hydrogen gas is reacted in a rigid container at a certain temperature as follows:
Answer:
The concentration of nitrogen gas and hydrogen gas that reacted initially are 10.0 M and 11.0 M respectively.
Note: The question is incomplete. The complete question is as follows:
An initial mixture of nitrogen gas and hydrogen gas is reacted in a rigid container at a certain temperature as follows:
3H2(g)+N2(g)⇌2NH3(g)
At equilibrium, the concentrations are
[H2] = 5.0 M, [N2] = 8.0 M, and [NH3] = 4.0 M.
What were the concentrations of nitrogen gas and hydrogen gas that were reacted initially?
Explanation:
Given the following data:
Concentration of H2 at equilibrium = 5.0 M
Concentration of N2 at equilibrium = 8.0 M
Concentration of NH3 at equilibrium = 4.0 M
The given equilibrium reaction is,
Initial a b c
Change -3x -x +2x
Equilibrium (a-3x) (b-x) +2x
The value of x is calculated from the equilibrium of NH3
Concentration of NH3 at equilibrium = 4.0 M = 2x
x = 2.0 M
Substituting the value of x above
Initial Concentration of H2:
a - 3 × 2.0 M = 5.0 M
a = 6.0 M + 5 = 11.0 M
Initial Concentration of N2:
b - 2.0 M = 8 M
b = 8.0 M + 2.0 M
b = 10.0 M
Therefore, the concentration of nitrogen gas and hydrogen gas that reacted initially are 10.0 M and 11.0 M respectively.
Why do surface waves break along the shore?
Answer:
because the global sea level rises while the poles temperature increases
Explanation:
To prepare 800mL of 1M phosphate buffer of pH 7.2 (PKa=7.1), by using salt = K2HPO4 and acid = KH2PO4, the quantity of salt required is
Answer:
78.04g of 0.448 moles must be added
Explanation:
Using H-H equation we can find the pH of the buffer:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer = 7.2
pKa = 7.1
[A⁻] = [K₂HPO₄]
[HA] = [KH₂PO₄]
Replacing:
7.2 = 7.1 + log [K₂HPO₄] / [KH₂PO₄]
0.1 = log [K₂HPO₄] / [KH₂PO₄]
1.2589 = [K₂HPO₄] / [KH₂PO₄] (1)
And as the concentration of the buffer is:
1M = [K₂HPO₄] + [KH₂PO₄] (2)
Replacing (2) in (1):
1.2589 = 1M - [KH₂PO₄] / [KH₂PO₄]
1.2589 [KH₂PO₄] = 1M - [KH₂PO₄]
2.2589 [KH₂PO₄] = 1M
[KH₂PO₄] = 0.44M
And [K₂HPO₄] = 0.56M
In 800mL = 0.8L:
0.8L * (0.56mol / L) = 0.448 moles K₂HPO₄. The mass is -Molar mass K₂HPO₄: 174.2g/mol-:
0.448 moles * (174.2g / mol) =
78.04g of 0.448 moles must be addedHow many atoms of tin are found in 3.50 moles of tin?
Answer:
2.11x10²⁴ atoms
How much energy is needed to heat 9.3 grams of silver metal from 21 °C to 52 °C, if the
specific heat of silver metal is 0.240 J/g °C?
Question 5
4 pts
How much heat must be added if 160 grams of water is heated from 24 °C to 85 °C?
(The specific heat of water is 4.184 J/g °C)
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
question 4. 69.19J
question 5. 40835.84J
Explanation:
question4.
heat needed = mass × specific heat capacity × change in temperature
= 9.3× 0.240×(52-21)
=69.192J
question 5.
heat added = 160× 4.184×(85-24)
= 40835.84J
HELP ASAP I will mark brainliest
Answer: The last one I think
Explanation:
Answer:
10623.0
Explanation:
Because 3541 is speed per hour
You need to find 3 hours
so multiply 3541 x 3
3541 x 3 = 10623
10623.0When energy is released by the pack, what happens to the energy of the surroundings (outside the pack)?
a. The energy increases
b. The energy decreases
c. The energy stays the same
Answer:
a
Explanation:
i hope that's correct
The energy of the surroundings (outside the pack) will:
a. The energy increases, when energy is released.
Energy in the surroundings:Energy is delivered to create bonds, which is the reason the enthalpy change for it is positive to break bonds. Energy is expected to break bonds. Particles are a lot more joyful when they are "wedded" and discharge energy since it is simpler and more steady to be seeing someone.
When energy is released, the energy in the surroundings will increase.
Thus, option a is correct.
Find more information about Energy here:
brainly.com/question/25959744
How many grams of Sn will be created when 114 grams of SnO2 react with excess H2? SnO2 + H2 ->Sn + H2O
I
Explanation:
CNN vfbtgnynynynynyuybunujy
Given the reaction: 2 H2 + O2 => O2 = 2 H2O.
What is the total mass of water formed when 497.80 g of oxygen reacts with hydrogen?
Describe the behavior of water molecules during each stage of the water cycle.
Hurry pls this is due by the end of the class period so like 10 MINUTES HELP
Answer:
chupapi muano goagaag djdu
The ion which forms from element 36 is known as
A. Krypton ion
B. Kryptonite
C. kryptonide ion
D. this ion does not exist
Water can exist in all three states of matter.
Describe the arrangement and movement of particles in each of the three states of matter. Explain what happens to the particles in a liquid during boiling.
I'll give someone brainly and thanks if they answered the question correctly. 30 points!!
Answer:
The particles in a liquid move very quickly due to heat while it is boiling and gradually turns to gas
PLEASE HELP ASAP I'LL MARK BRAINLIEST
Thank you :)
8. A meteor moving 468 km per minute traveling in a south-to-north direction passed near Earth in 2013.
Does this statement describe the meteor’s speed or velocity? 1pt
9. Why did you choose the answer above (explain why)? 1pt
Answer:
Its velocity was 7.8 km/s northward.
Explanation:
Because the meteor was only 45 m wide and was 27,700 km above Earth's surface it was not visible with the aid of a telescope.
Which expressions are equal to 675? 700 – 25 O 700 – 75 O 600 + 75 O 634 + 31 500 275
Answer:
30
Explanation:
Answer:
The first one, The third one.
700-25, 600+75!
Explanation:
Which statement best explains a way in which a cell gets rid of wastes?
Answer:
I would say B but you don't have to take my word for it
Answer:
D
Explanation:
I WILL GIVE BRAINLIST!!!!!!!!!!!!!!!!!!!!!! PLZZZZZZZZZ HELPPPPPPPPPPPPPP
Explain how proper motion will affect the constellation as seen from the earth.
what type of bond holds different water molecules together
HELP NEEDED
How many nanoliters are in 1 liter. Show work
1 000 000 000 nanoliters
Which nitrogen base sequence is the partner of C-A-T-C-G-A?
C-A-T-C-G-A
G-T-A-G-C-T
T-G-C-T-A-G
G-C-A-T-G-T
Answer:
The answer should be B. G-T-A-G-C-T
A pairs with T and G pairs with C.
Answer:
It's B, GTAGCT.
Explanation:
In the cycle, after a new moon, _______________ means light appears on the _____________ side of the moon and continues to ________________.
Answer:
Explanation:
In the cycle, after a new moon, waxing means light appears on the right side of the moon and continues to increase.
The diagram represents liquid water in a pan on a hot plate. The liquid water is boiling and changing into water vapor. The process of boiling water is considered to be a.
Answer:
Sorry i might be wrong but I believe the answer is evaporation
Explanation:
Its says the diagram So is there a diagram u can show us?
Answer:
physical change, because a new substance is formed
Explanation:
Which molecule is Polar
HF
SiBr4
CO2
CH20
Answer:
Polar molecules have a non-zero net dipole moment. Both CO2 and H2O have two polar bonds. However the dipoles in the linear CO2 molecule cancel each other out, meaning that the CO2 molecule is non-polar. The polar bonds in the bent H2O molecule result in a net dipole moment, so H2O is polar.
Explanation:
Which layer over time due to chemical and physical weathering leads to the other layers?
Answer:
chemical weathering occurs on the surface of minerals, the water and acids that control chemical weathering require access to the surface. Physical weathering breaks the rock to provide that surface
The amount of matter in an object is ___ and a common unit is the ___.
A. mass, mL
B. volume, mL
C. volume, gram
D. mass, gram
Answer:
The answer is D
Explanation:
Mass is the amount of matter in an object and gram is the common unit of measurement of mass