Chemistry High School

Help ASAP I will mark brainliest for the correct answer !!!⚡️

Answers

Answer 1

the 2nd one i believe, position

Answer 2

Answer:

motion

Explanation:

Related Questions

How many atoms of tin are found in 3.50 moles of tin?

Answers

Answer:

2.11x10²⁴ atoms

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

Answers

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:

When 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

Answers

Answer:

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

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.

Answers

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.

Answers

Answer:

The periodic table was made that way by the scientists who created it

Explanation:

to make things easier for the users.

Which layer over time due to chemical and physical weathering leads to the other layers?

Answers

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 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.

Answers

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

Answers

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 statement best explains a way in which a cell gets rid of wastes?

Answers

Answer:

I would say B but you don't have to take my word for it

Answer:

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

Answers

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 added

What human actions contributed to the nutrient pollution of Lake Okeechobee?
PLZ HELP MEEEEEEEEEEEEEEEE I BEG YOU

Answers

Answer:

These trends were attributed to both the increased external loads and to a reduction in the lake sediment's ability to assimilate nutrients from the water column. The main sources of external nutrient inputs are animal waste and fertilizers applied to food and forage crops.

Which of the following is not a part of the digestive system

A. Mouth
B.Esophagus
C.Intestines
D.Kidneys

Answers

Answer:

Kidneys •_•

Hope this helped <3

D. Kidneys
The rest of the choices are in the digestive tract

Why do surface waves break along the shore?

Answers

As waves reach the shore, the energy in front of the wave slows down due to friction with the shallow bottom. ... The wave breaks, and it usually does so in water depth that is 1.3 times the wave height.

Answer:

because the global sea level rises while the poles temperature increases

Explanation:

How many grams of Sn will be created when 114 grams of SnO2 react with excess H2? SnO2 + H2 ->Sn + H2O
I

Answers

Explanation:

CNN vfbtgnynynynynyuybunujy

In the cycle, after a new moon, _______________ means light appears on the _____________ side of the moon and continues to ________________.

Answers

Answer:

Explanation:

In the cycle, after a new moon, waxing means light appears on the right side of the moon and continues to increase.

I WILL GIVE BRAINLIST!!!!!!!!!!!!!!!!!!!!!! PLZZZZZZZZZ HELPPPPPPPPPPPPPP

Explain how proper motion will affect the constellation as seen from the earth.

Answers

Proper motion describes how stars slowly drift in space and change their position in relation to the sun. Since stars have proper motion, over time, the patterns we see now in constellations will not be the same.

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

Answers

Answer:

chupapi muano goagaag djdu

HELP NEEDED
How many nanoliters are in 1 liter. Show work

Answers

1 000 000 000 nanoliters

1000000 ur welcomeeee

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

Answers

The answer would be B.

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

An initial mixture of nitrogen gas and hydrogen gas is reacted in a rigid container at a certain temperature as follows:

Answers

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.

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

Answers

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

The ion which forms from element 36 is known as
A. Krypton ion
B. Kryptonite
C. kryptonide ion
D. this ion does not exist

Answers

Answer: A
Krypton is a chemical element with the symbol Kr and atomic number 36.

HELP ASAP I will mark brainliest

Answers

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

10623.0

How do you know when a redox equation is balanced?

Answers

Like to check? Just add up the charges on both sides and see if they equal each other:)

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?

Answers

Mol of oxygen = mass / Mr = 15.556
1:2 mol ratio so multiple by 2
= 31.1125 mol of water
Mass = mol x Mr
= 31.1125 x 18 = 560.025g

Which of the 3 molecules: Methane, Propane, Butane would release the most energy when combusted?

Answers

Answer:

butane

Explanation:

what type of bond holds different water molecules together

Answers

Polar covalent bonds

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

Answers

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.

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!!

Answers

Answer:

The particles in a liquid move very quickly due to heat while it is boiling and gradually turns to gas

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

Answers

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:

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The imagery of fire shapes the mood of love he wants in his life. Of course his head is not literally on fire, fire represents his desire that takes him into the hazel wood. Aengus shapes a wand, or a stick for fishing. He uses a berry as the bait to catch fish. The moth-like stars were flickering out, so you know that the time of the day is dawn. When Aengus dropped a berry in the stream, he caught a small silver fish.In the second stanza, Aengus describes laying the fish on the floor, and starting the fire. He was starting to cook something and something rustles on the floor and someone calls his name. When he turns around and expects to see the trout he sees a glimmering girl, who had apple blossom hair and she called him by his name again and then ran faded through the brightening air.The third stanza jumps forward until Aengus is an old man, and spends his whole life looking for the glimmering girl. 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