Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?

Answer:

1) Darkness

2)Blocks

3)Eclipse

5)Solar Eclipse

6) Moon, Earth, Sun

7)Total

8)Partial

9)Moves

10)Umbra, Penumbra

Answer:

The answer of this question is molecule

Answer:

B A plant cell can contain both chlorophyll and a nucleus.

Explanation:

All plants are eukaryotic organisms i.e the cells of all plants possess a membrane-bound nucleus that houses their genetic material (DNA). In addition to this, most plant cells also contain a unique organelle called CHLOROPLAST, which they use to capture the energy from sunlight in order to perform a process called PHOTOSYNTHESIS.

According to this question, plant cells can contain both chlorophyll and a nucleus. They can possess chlorophyll because chlorophyll is a pigment in their chloroplast that captures the light energy.

Answer:

atoms should be the correct answer

Answer:

Matter is made up of tiny particles called atoms.

Explanation:

Atoms are made up of protons, neutrons and electrons. Atoms come together to form molecules which are building blocks for all types of matter.

Answer:

-34¨F

Explanation:

Answer:

b) sharpening a pencil

Explanation:

If you melt lead, boil water, or dissolve sugar in water, you can return all of them back to their original state. If you sharpen a pencil, you can't reattach the shavings as they were originally.

You may put all of them back to their original states by melting lead, heating water to a boil, or dissolving sugar in water. You cannot rejoin the shavings from a sharpened pencil in their original position. Thus, option B is correct.

When something changes physically but not chemically, it has undergone an irreversible physical alteration that cannot be reversed.

Sharpening a pencil is a perfect example of an irreversible physical change. The wood turns to dust when you sharpen it. Just in a different shape, it is still wood. That wood dust cannot be transformed back into a pencil.

You cannot put a piece of paper back together the same way it was before you tore it if you tear it into tiny pieces.

An irreversible alteration is one that cannot be undone or that cannot be returned to its original state, such as when milk turns into curd, iron turns rusty, paper burns, food is cooked, etc.

Therefore, sharpening a pencil is an irreversible physical change

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Answer:

Many atoms consist of a positively charged nucleus composed of protons and neutrons surrounded by a negatively charged cloud of electrons. At its most basic level, an atom is any particle of matter that contains at least one proton. ... Here are some examples of atoms: Neon (Ne) Hydrogen (H)

Explanation:

Answer:

calcium

Explanation:

Answer:

Q = -627.6 J

Explanation:

Mass, m = 15 grams

Initial temperature, [tex]T_i=40^{\circ} C[/tex]

Final temperature, [tex]T_f=30^{\circ} C[/tex]

We need to find the amount of heat released by this much of sample of water. We know that heat released is given by the below formula :

[tex]Q=mc\Delta T[/tex]

c is specific heat of water, [tex]c=4.184\ J/g-K[/tex]

[tex]\Delta T=T_f-T_i\\\\=(30^{\circ}-40^{\circ} )\ C\\\\=-10^{\circ} C\\\\=-10\ K[/tex]

So,

[tex]Q=15\times 4.184\times -10\\\\Q=-627.6\ J[/tex]

Hence, 627.6 J of heat is released and negative sign shows that energy is being given off.

Answer:

Ocean

Explanation:

Answer:

1. Mass of the blue ball is 5 kg.

2. Mass of the red ball is 3.75 kg.

Explanation:

The following data were obtained from the question:

For the blue ball:

Force (F) = 15 N

Acceleration (a) = 3 m/s²

Mass (m) =.?

Force the red ball:

Force (F) = the same with that of the blue ball = 15 N

Acceleration (a) = 4 m/s²

Mass (m) =.?

1. Determination of the mass of the blue ball.

Force (F) = 15 N

Acceleration (a) = 3 m/s²

Mass (m) =.?

Force (F) = mass (m) × acceleration (a)

F = ma

15 = m × 3

Divide both side by 3

m = 15/3

m = 5 kg

Therefore, the mass of the blue ball is 5 kg

2. Determination of the mass of the red ball.

Force (F) = 15 N

Acceleration (a) = 4 m/s²

Mass (m) =.?

Force (F) = mass (m) × acceleration (a)

F = ma

15 = m × 4

Divide both side by 4

m = 15/4

m = 3.75 kg

Therefore, the mass of the blue ball is 3.75 kg

Answer:

Mgl2 is your answer. Can I get brainliest

Answer:

The further away electrons are from the nucleus the easier it is for atoms to use electrons.

Explanation:

Answer herbert

Explanation:

cause he did not do any of the safety precautions and he was prob not listening to the teacher  

The type of reaction is Mg + S → MgS is of synthesis reaction. Therefore, the correct option is option B among all the given options.

A synthesis reaction occurs when multiple chemical species unite to create a more complex product. One of the most typical chemical reactions, it is also known as a direct reaction.

A bigger compound is created when two or maybe more reactants mix. A deconstruction reaction, which occurs when the bonds in a complex product are broken and it separates the product in with its individual components or elements, is the reverse of a synthesis process.  The type of reaction is Mg + S → MgS is of synthesis reaction.

Therefore, the correct option is option B among all the given options.

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Answer:

The heat is transferred from your hand to the ice, this is because, as we know, heat gets transferred from a hot object to a colder object.

In this case, our hand is clearly hotter than the ice cube.

Therefore, the heat is transferred from your hand to the ice cube.

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Thank You!!

Answer:

In units of measurement of length we use centimeter (cm) to measure. We can use this unit for measuring the length of a pencil, the width of a book etc. but this unit is too big to measure the thicken of a pencil. So we use another unit called millimeter (mm).

Explanation:

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{5.25 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 87.2093023...[/tex]

We have the final answer as

Hope this helps you

Answer:

2°C

Explanation:

The answer is D because cooler air holds less water vapor than warmer air, and 2°C is the coldest choice, so there's your answer!

At 2°C (36°F) temperature would air hold the LEAST water vapour. Hence, option D is correct.

Temperature expresses hotness and coldness or a measure of the average kinetic energy of the atoms or molecules in the system.

At 2°C (36°F) temperature would air hold the LEAST water vapour because cooler air holds less water vapour than warmer air, and 2°C is the coldest choice.

Hence, option D is correct.

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Answer: Qualitative

Explanation: It isn't talking about the amount, it is talking about the quality so it would be qualitative and not quantitative.

Answer:

Explanation:

As relative molecular mass of molecule increases its rate of diffusion decreases . Mr of HCl is 1+35.5=36.5 which is greater than Mr of NH3 which is only 14+3=17. As HCl is heavier it'll diffuse at a lower rate so travel less distance whilst NH3 will cross a greater distance as it diffuses faster so white solid appears closer to HCl that is approximately B.

Answer:

.

Answer: 5 All of the molecules have the same kinetic energy

since the temperature is kept constant at 298 K

Explanation:

The AVERAGE kinetic energy is directly proportional to the absolute temperature.

All the molecules have the same average kinetic energy as average kinetic energy is directly proportional to the absolute temperature. So, the correct option is 5.

The average kinetic energy (K) is equal to one-half of the mass (m) of each gas molecule times the root mean square speed (Vrms) squared.

We know that the average kinetic energy is directly proportional to the absolute temperature.

All of the molecules have the same kinetic energy since the temperature is kept constant at 298 K.

Therefore, All the molecules have the same average kinetic energy as average kinetic energy is directly proportional to the absolute temperature.

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Answer:

The right answer is C. The molecules of solid CO2 are much closer together than the molecules of CO2 gas.

The molecules of CO2 gas are much closer together than the molecules in dry ice. So CO2 gas is easily compressible but solid CO2 is incompressible. The correct option is A.

Carbon dioxide in its solid form is known as dry ice. Because CO2 does not have a liquid state at normal atmospheric pressure and sublimates directly from the solid to the gas state, it is commonly used for temporary refrigeration.

Dry ice can be a serious hazard in a small, poorly ventilated space. When dry ice melts, it emits carbon dioxide gas.

This gas can accumulate in a small space. A person can become unconscious and, in some cases, die if there is enough carbon dioxide gas present.

CO2 gas molecules are much closer together than dry ice molecules. As a result, CO2 gas is easily compressible, but solid CO2 is not.

Thus, the correct option is A.

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Answer:

14 elements.

Explanation:

B

boron

C

carbon

F

fluorine

H

hydrogen

I

iodine

N

nitrogen

O

oxygen

P

phosphorus

K

potassium

S

sulfur

W

tungsten

U

uranium

V

vanadium

Y

yttrium

Answer:

The uneven heating causes temperature differences, which in turn cause air currents (wind) to develop, which then move heat from where there is more heat (higher temperatures) to where there is less heat (lower temperatures).

Explanation:

Answer:

N> As> Ga

Explanation:

There are two important factors that come into play when we are discussing the strength of attraction between protons and valence electrons;

1) distance of the valence electrons from the nucleus

2) size of the nuclear charge

If we consider the elements; nitrogen, arsenic and gallium, nitrogen is in period 2. This implies that it has only two shells. The valence electrons are closer to the nucleus and are more strongly attracted to the protons in the nucleus.

Arsenic and gallium are both in period 4. This implies that they both contain a total of 4 electron shells. However, arsenic has a nuclear charge of 33 protons while gallium has a nuclear charge of 31 protons. Hence arsenic has a greater size of nuclear charge than gallium. The attraction between protons and valence electrons in arsenic is therefore greater than it is in gallium.

Answer:

Explanation:

The average speed in the question can be found by using the formula

[tex]v = \frac{d}{t} \\ [/tex]

where

d is the distance

t is the time taken

We have

[tex]v = \frac{2000}{3.5} \\ = 571.428571...[/tex]

We have the final answer as

Hope this helps you

Answer:

it gets cold or warm

Explanation:

pleas get me 53 likes

Answer:

ocean temp

Explanation:

If air temperature decreases, then wave height will decrease and ocean temperature will also decrease, but not as much.

The water's temperature at the surface is known as the ocean surface temperature. Depending on the measuring technique, the term "surface" might signify anything from 1 millimeter to 20 meters below the sea's surface.

Due to changes in solar radiation and the physical characteristics of water, the temperature of ocean water fluctuates depending on location, both in terms of latitude and depth.

Water contracts and gets denser as it cools. The density of water is influenced by temperature and salinity, and as a result, water moves up or down through the ocean's strata and circulates as currents.

Thus, option B is correct.

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