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Answer:

Nickel atoms have 28 electrons and the shell structure is 2.8. 16.2. The ground state electron configuration of ground state gaseous neutral nickel is [Ar]. 3d8.

Explanation:

Answer:

Carbon dioxide, or CO2, is a naturally occurring linear compound composed of two oxygen atoms covalently bonded to a carbon atom. The two C=O. Carbon DioxideA central carbon atom is connected to two oxygen atoms via double bonds in a linear structure.

Explanation:

Answer : 3.53x10⁻³ ml

Density : the ratio between mass and volume

Can be formulated :

[tex]\tt \boxed{\bold{\rho=\dfrac{m}{V}}}[/tex]

ρ = density, kg/m³ or g/ml

m = mass, kg or g

V = volume = m³ or ml

While mol : dividing mass with molar mass(MW=molecular weight)

[tex]\tt n=\dfrac{mass}{MW}[/tex]

n= mol

mass = grams

MW = molecular weight ,g/mol

moles : 0.00024 moles of Mercury(Hg)

MW of Hg = 200,59 g/mol

so the mass of Mercury :

[tex]\tt mass=moles\times MW\\\\mass=0.00024\times 200,59\\\\mass=0.048~g[/tex]

Because the density of Mercury is 13.6 g/mL, then the volume :

[tex]\tt V=\dfrac{mass}{density}\\\\V=\dfrac{0.048~g}{13.6~g/ml}\\\\V=\boxed{\bold{3.53\times 10^{-3}ml}}[/tex]

answer:

d) algae will grow, causing algae blooms

explanation:

changes in the environment create algae blooms. (ie. excessive use of fertilizer)

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i hope this helps

have a great day!

Extra fertilizer runs off the farms, into the rivers, and out into the oceans. Algae will grow, causing algae blooms. Therefore, the correct option is option D.

Any substance of either synthetic or natural origin applied to soil or plant tissues to provide plant nutrients is referred to as a fertilizer or fertiliser. It's possible to distinguish fertilizers from liming agents and other non-nutrient soil additives. There are numerous natural and man-made sources of fertilizer.

With the exception of the sporadic inclusion of supplements such rock flour for micronutrients, fertilization for the majority of modern agricultural techniques concentrates on the three basic macronutrients of nitrogen (N), phosphorous (P), plus potassium (K). Farmers recently have started to use a lot of fertilizer on farms. Extra fertilizer runs off the farms, into the rivers, and out into the oceans. Algae will grow, causing algae blooms.

Therefore, the correct option is option D.

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Answer:

its 90

Explanation:

because you add the mass together

Answer:

matter is anything that has mass and takes up space

Explanation:

Answer:sodium

Explanation:

Sodium is the element that has the fewest valence electrons. The correct option is B.

A valence electron is an electron associated with an atom in the outer shell that can take part in the formation of a chemical bond if the surface layer is not closed.

Both atoms in a single covalent bond contribute one valence electron to form a shared pair.

Valence electrons are electrons in an atom's outermost shell, or energy level. For example, oxygen has six electron, two of which are in the 2s subshell and four of which are in the 2p subshell.

Because the highest energy 3s orbital has one electron, neutral sodium atoms have one valence electron.

Thus, the correct option is B.

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Answer:

fission

Explanation:

Answer:

A

Explanation:

The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection. Tight cell junctions in these tissues prevent microbes from passing through.

Hope this helps:)

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 2.34 g

density = 4.78 g/mL

We have

[tex]volume = \frac{2.34}{4.78} \\ = 0.4895397...[/tex]

We have the final answer as

Hope this helps you

Answer:

1. 4.75

2. 5.50

Explanation:

Answer:

Ionic

Explanation:

Ionic compounds generally form between elements that are metals and elements that are nonmetals. For example, the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl2).

Answer:

newtons 2nd law is the answer

The percentage by mass of oxygen in the 25.3 g sample of the unknown compound is 3.16%

From the question given above, the following data were obtained:

Mass of compound = 25.3 g

Mass of oxygen = 0.8 g

The percentage of oxygen in the compound can be obtained as follow:

[tex]Percentage = \frac{mass of element}{mass of compound } *100[/tex]

Percentage of oxygen = [tex]\frac{0.8}{25.3} * 100[/tex]

Thus, the percentage of oxygen in the compound is 3.16%

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Answer:

2 and 4

Explanation:

The rest of the changes are chemical. 1 has a chemical reaction happen which makes light sticks glow. 3 is because browning the meat actually causes some new compounds to form and cause caramelization.

For 2, the oxygen is simply heating up and expanding which pops the balloon. 4 is just a phase change of water vapor to liquid water.

Answer:

This is how

Explanation:

Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron). The positive charge on a proton is equal in magnitude to the negative charge on an electron.

Answer: They are all subatomic particles that make up an atom.

Answer:

It would be an isotope.

Background Information:

Isotopes are typically elements that have a different number of protons than neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.

Explanation:

If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then we can simply take away the amount of protons from that number, 18 - 8 = 10. If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons we know that this particular atom is an isotope.

It would be an isotope.

Isotopes are elements that have the same number of electrons and protons but different numbers of neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.

If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then protons

18 - 8 = 10

If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons. So, the particular atom is an isotope.

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Answer:

You subtract the given atomic mass by the atomic number

Explanation:

The answer is the explanation

Answer: The answer is C! Convection.

Explanation:

Apex!! Convection is thermal energy through water, and vapor is still a form of water.

Answer:

c. convection

Explanation:

AP-EX

Answer:

oxygen

Explanation:

Putting the jar over the candle keeps oxygen from outside the jar from getting in. The reaction can only use the oxygen that is already in the jar. So, when that oxygen is used up, the reaction can't keep going. Running out of oxygen makes the flame go out.

​

The heat of the flame vaporizes the liquid wax (turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon. These vaporized molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapour (H2O) and carbon dioxide (CO2).

Combustion

And when you light a candle you use the candle's wax as fuel for a chemical reaction called combustion which involves reacting hydrocarbons with oxygen, breaking them down into carbon dioxide and water.

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Answer:

A

Explanation:

The list of celestial bodies from smallest to largest are asteroids, moons, planets, and Stars.

A celestial body is an occurrence that naturally takes place in space. The terms object and body can be used interchangeably when referring to space and galaxies. Celestial bodies are firmly bound things with intricate shapes and structures that contain hundreds of smaller items.

The sun, moon, stars, and planets are examples of celestial bodies, sometimes known as heavenly bodies. The cosmos contains celestial objects, which are cosmic bodies that are visible in space and are positioned distant from the earth. We can only see the majority of the celestial groupings with a telescope.

They are usually seen at night and are invisible to the unaided eye. The size of certain celestial bodies is considerably greater than that of the planet. They are located outside of the atmosphere of the earth. There are millions of celestial bodies in the Kuiper belt.

Therefore, the list of celestial bodies, from smallest to largest are asteroids, moons, planets, and stars.

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Answer:

Explanation:

In a similar way charged particles such as electrons need to have work done to move them from one point to another. The amount of work per unit of charge is called is called the electric potential difference between the two points. The unit of potential difference is called the volt.

Answer: When in a magnetic field, the two electrons in a particular orbital differ very slightly in energy because of a property called electron spin. The theory of electron spin states that the two electrons in a single orbital spin in opposite directions on their axes, causing an energy difference between them

Explanation: I hope this helps!

Answer:

Explanation:

In order to find the volume be at 101.3 kPa we use Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\ [/tex]

From the question

P1 = 112 kPa = 112000 Pa

V1 = 259 cm³

P2 = 101.3 kPa = 101300 Pa

We have

[tex]V_2 = \frac{112000 \times 259}{101300} = \frac{29008000}{101300} \\ = 286.3573543...[/tex]

We have the final answer as

Hope this helps you

Oxygen

Oxygen is considered an element because it cannot be broken down any farther.