Someone pls help me I will make you brain


Match them pls

Answer:

50 metres per second.

Explanation:

Speed is the total distance covered divided by the time taken to cover that distance. Therefore, the plane's speed is obtained by dividing 450,000 metres by 9000 seconds, resulting in a speed of 50m/s.

The source of gases for the secondary atmosphere of the earth was Volcanic Eruptions.

The scientist think that the atmosphere today is completely different from what it used to be originally and therefore they call it secondary atmosphere.

Internal volcanic activity or the deposit of debris from comet collisions produce a secondary atmosphere. 

The secondary atmosphere is thought to have formed as a result of the numerous volcanic eruptions that occurred from the start of Earth's early periods.

Although each volcano is unique, they all emit gases such as H₂O, CO₂, SO₂, H₂S, HCl, N₂, NO₂, and others.

These gases are formed due to melting of the Earth's crust.

Volcanic activity  renew the atmosphere's molecules.

These molecules are not the Nitrogen and Oxygen that make up the atmosphere today.

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C)

Only valence electrons are involved in forming chemical bonds betwen two atoms.

Hope this helped you- have a good day bro cya)

The scientific principle was surmised by Werner Heisenberg and it is called Heisenberg's uncertainty principle.

In 1927 German scientist Werner Heisenberg propounded the uncertainty principle which states that both the position and momentum of a particle cannot be measured simultaneously with certainty.

That is, the more accurate we measure the position of the particle, the less accurate we would measure its momentum.

Heisenberg's uncertainty principle is stated mathematically as ΔpΔx ≥ h/4π where p is the momentum, x is the position and h is Planck's constant.

So, the scientific principle was surmised by Werner Heisenberg and it is called Heisenberg's uncertainty principle.

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Answer:

The answer is A.) leaving a copper penny in vinegar until it turns green.

All the other options are physical changes, as you can separate the two mixtures.

I hope this helps you! :)

laboratory safety rules:

~Avoid wye contact with all chemics

~ Avoid skin contact with all chemicals

~Always wear safety glasses

~Don't eat in the lab

~Don't drink anything in the lab

~Avoid wearing jewellery

~Don't taste or sniff any chemicals

~Kn0w emergency exit routes

~Never leave containers of chemicals open

~Avoid distracting anyone else working in the lab

Hope this helped you- have a good day bro cya)

Answer:

4chlorine;12thousand ;17zinc;2grams;three 8carbon;15aluminium

Answer:

plusses give me brainliest after this

The answer is: 1. periodic table

Answer:

Gold is chemically stable and conducts electricity.

Small pockets of gold are used to make mobile phone circuit board.

The plastic is lined to act as antenna gate. It's what makes a phone not a calculator but a communication point, since it allows the data flow, Bluetooth connection, Wi-Fi. Mainly, it allows radio waves to flow.

Answer:

That would be ATP, hope this helps! :)

Answer:

D

Explanation:

Its D

Answer:

Its d for edge

Explanation:

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Why it is important to have balanced charges when forming ionic compounds?

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Answer:

Combustion

Explanation:

The process of adding oxygen to anything is called combustion

Answer:

true/ correct

Explanation:

Answer:

the first one

Explanation:

hope this helps

Answer:

The lower the pressure, the lower a liquid's boiling point is. That's why water boils much faster at the top of a mountain than it does at the bottom. In space, there is no pressure. So the boiling point could easily drop to your body temperature.

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Answer:

a

Explanation:

a

Answer:

more drought is not a global warming

Answer:

i think it is human migration

because when drought becomes more its one sign of global warming and when land becomes less there wont be place for people to plant trees

Answer: The elements that have the lowest electronegativity are the VIII A elements or noble gases. These elements have a theoretical electronegativity of zero. These elements are stable in their electron configuration there is not force moving the noble gases to gain any electrons.

Explanation:

Answer:

Prokaryotic / Eukaryotic

Answer:

The answer is unsaturated

Answer:

supersaturated

Explanation:

Answer:

Lung function decreses at a faster rate for young people (last answer choice)

Explanation:

Answer:

i would test it and get real honey to see if the ingredients are the same

Explanation:

Explanation:

Water Test: In a glass of water, put a spoon of honey, if your honey is dissolving in water then it's impure. Pure honey has a thick texture that will settle at the bottom of a cup or a glass. –Vinegar Test: Mix a few drops of honey into vinegar water, if the mixture starts to foam, then your honey is impure.

Answer:

The answer is true. ozone in the stratosphere is a toxic pollutant that can cause tightness or shortness of breath.

Answer:

QP

Explanation:

P has 9 electrons.

Electronic Configuration : 2, 7

Valence electrons : 7

P needs 1 electron to get stable electronic configuration.

Q has 3 electrons.

Electronic Configuration : 2, 1

Valence electrons : 1

P needs to loose 1 electron to get stable electronic configuration.

Q donates 1 electron,

Q -----> Q+ + 1 e-

P gains 1 electron,

P + 1 e- -----> P-

Q+ + P- -----> QP

This is an ionic compound.

When the cell potential is positive then the electrochemical reaction is spontaneous. The Ecell is positive when Zn serves as cathode and Mg serves as anode hence the reaction is spontaneous.

An electrochemical cell is any type of cell in which energy is produced by a spontaneous chemical reaction. Redox reactions that occur in an electrochemical cell produce energy.

An electrochemical cell becomes spontaneous only when Ecell is positive. Ecell is positive when a metal that has a more negative electrode potential serves as the anode.

Since Mg has a more negative electrode potential that Zn, it follows that a cell in which Mg is the anode and Zn is the cathode will have a positive Ecell and the reaction will be spontaneous.

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Answer:

Pure substances made of more than one element are called. compounds. The chemical formula for a molecule of nitrogen is. N2. The balanced equation for the formation of water from the elements hydrogen and oxygen is.

Answer:

A compund

Explanation:

Did test got 100

The atomic radius of Argon is smaller than the atomic radius of sodium because the effective nuclear charge increases as we move left to right in a period.

The atomic radius can be described as the shortest distance between the center of the nucleus of the atom and the outermost shell of the atom. An atomic radius can also be defined as half the distance between two atoms of the same element bonded together.

In general, the atomic radius of an atom reduces as we move from left to right in a period on the periodic table because while moving from left to right in a period, there is an increase in the effective nuclear charge. In periods, the valence electrons enter in the same outermost shell.

The atomic radius of atom increases when we move down a group because of the addition of a new principle shell.

Sodium is present at beginning of the third period and the Argon is present at the end of the same period. Therefore, Argon experiences a more effective nuclear charge than sodium so it has a smaller atomic radius.

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