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Answer:

a) When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. A compound is a material in which atoms of different elements are bonded to one another. Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide.

b) Metals react with oxygen in the air to produce metal oxides. For example, magnesium reacts with oxygen to produce magnesium oxide when it is heated in air: magnesium + oxygen → magnesium oxide 2Mg + O2 → 2MgO

Explanation:

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Answer:

2 ka A. nitrogen, oxygen, Carbon dioxide

Answer:

no 1 Ans gas

hope it works

Answer:

Firms produce goods and services,which they sell to households in return for revenue.

Answer: Goods and Services

Explanation:

According to forces of attraction and as boiling point is 100°C pure water cannot exist as a liquid at 110° C.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

density =  7.02 g/mL

Explanation:

density is mass over volume, just divide

d = 625 g/89 mL = 7.02 g/mL

To be in the path of totality means that

The path of totality is the track the Moon's umbral shadow leaves across the surface of the Earth. Its width measures up to 200 miles and its length measures up to 10,000 miles.

When the moon covers the earth's surface, a total solar eclipse has occurred.

An individual who is on the path of totality can observe the occurrence of a total solar eclipse within a short while.

Summarily, a person who is on the path of totality can see a total lunar eclipse.

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Answer:

blue white green and brownn

Explanation:

seen one

Chemical change cuz you are adding another substance to your water which changes the molecular structure of the water.

Answer:

B

Explanation:

A photon is an elementary particle that has zero invariant mass and travels in a vacuum with a constant velocity. It is capable of generating electromagnetic phenomena since it carries all forms of electromagnetic radiation:

The photon presents wave and corpuscular properties, this means that it behaves as a wave in certain phenomena, such as refraction in a lens; and as a particle when it interacts with matter to transfer energy. The latter is expressed as follows:

[tex]E=\frac{hc}{lambda} = hv[/tex]

This means that each photon has energy that is proportional to the frequency of light.  In this case, the energy is quantized, which means that the energy of the photons is restricted to certain values. The energy at subatomic levels occurs in packets that refer to the photon, which are the packages of energy and each one correspond to different types of radiation.

This differs from classical waves, which can gain or lose arbitrary amounts of energy.

If we apply the equation and replace the information, we have:

[tex]E=\frac{6.63 x 10^{-34} J/s x 3 x 10^{8} m/s }{498 nm} = 3.99 x 10^{-28} J[/tex]

So 3.99 x 10^-28 J is the amount of energy of the photon of 498 nm emmited from a silicon atom.

Now we will show that the atomic levels are quantized. An atom has ground state (n=1) energy of 13.6 eV. Higher states means the atom is at an excited state. When this happens, an electron from an atom loses energy and makes a transition to a lower state. To avoid this and conserve energy, the atom emits a photon with an amount of energy that equals the difference of energy between a ground state and another state. So we can calculate the energy of the electron in different states.

[tex]E_{n} = \frac{-13.6 ev}{n^{2} }[/tex]

[tex]E_{1} = \frac{-13.6 ev}{1^{2} }=-13.6 ev[/tex]

[tex]E_{2} = \frac{-13.6 ev}{2^{2} }=-3.4 ev[/tex]

[tex]E_{3} = \frac{-13.6 ev}{3^{2} }=-1.511 ev[/tex]

N represents the principal quantum number, which is the overall energy of each orbital. This energy increases as its distance from the nucleus increases. Here we can se that the value of energy of n=1 is higher than energy of n=2, and this one is higher from the energy of n=3. This means each level has a specific energy and it is quantized according to the value of n.

So, a photon is an elementary particle which carries radiation and presents a wave-corpuscle duality, where particles may exhibit wave-like behavior in some experiments while appearing as particles in others. A photon is emmited when an atom loses energy, to conserve this energy and avoid a transition to a lower state.  The electron energy is quantized because it is restricted to characteristic values, only taking non-continuous values. In this question, the amount of energy of the photon emmited is 3.99 x 10^-28 J. And the atomic levels are quantized according to the principal quantum number.

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Answer: Covalent

Explanation: By definition, covalent bonds are those in which the shared electrons are shared greater than 50% of the time between two atoms.

Answer:

A weak acid is an acid which dissociates partially to release few hydrogen protons or ions

Explanation:

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Answer:

The value of gravitational constant on the surface of the moon is 1.625 m/s²

Answer:

I think copper

Explanation:

Material IACS % Conductivity

Silver                105

Copper            100

Gold               70

Aluminum         61

Nickel              22

Zinc                          27

Brass                  28

Iron                        17

Tin                      15

Phosphor Bronze  15

Lead                      7

Nickel Aluminum Bronze 7

Steel                   3 to 15

the table might help- your indian brother

Answer:

Because to them it was just a little bit of fiction. so they don't really think it's necessary to do experiments or make detailed observation

Explanation:

it's just like how we presently today discuss about robot talking to us like humans but it's not yet come to pass .

Answer:

Explanation:

Hello there, I think this is a limiting agent question.

When 3 moles of Mg is reacted with 2 moles of Br2, because of ratio, we just need 1.5 moles of Br2, so Mg is a limiting agent.

So 3 moles of Mg will make 3 moles of MgBr

Answer:

Use the given functions to set up and simplify

Mg+Br2→MgBr⋅2.

3=

2=

Mg+Br2→gBr⋅2=r2B+gM→MgBr⋅2

Explanation:

SORRY IF I AM WRONG HAVE A BLESS DAY :D

Answer:

So why hasn't it changed? The biggest reasons the U.S. hasn't adopted the metric system are simply time and money. When the Industrial Revolution began in the country, expensive manufacturing plants became a main source of American jobs and consumer products.

Answer:

the answer is b

Explanation:

Physical changes affect a substance's physical properties but do not alter its chemical structure. Types of physical changes include boiling, clouding, dissolution, freezing, freeze-drying, frost, liquefaction, melting, smoke and vaporization.

Answer:

Thanks!!!

Explanation:

Answer:

true

Explanation:

Answer:

Hey mate.....

Explanation:

This is ur answer....

Charts, tables, and graphs help communicators organize that data in a way that helps their audiences understand the story the data tells and, hopefully, interpret it correctly.

Hope it helps!

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Answer:

Further scientific studies showed that an atom can further be divided into subatomic particles electrons, neutrons, and protons. Thus the idea of the indivisibility of an atom changed when new evidence was discovered.

Answer:  an element with a high electronegativity and an element with a single valence electron  

is the correct answer

_______________________________________________________

Answer:

_______________________________________________________

"Why?"

For instance, fluorine is the most reactive non-metal element on the periodic table. Due to it's small size, as well as it's strong electronegativity, fluorine has a strong tendency to accept electrons from other atoms and ions. But when Fluorine comes in contact with Hydrogen (a single valence electron element), for instance, it immediately reacts, resulting in an explosion.

_______________________________________________________

Hope this helps!

Answer:

The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.

so simple question.

Answer:

Potential energy is stored energy that an object has because of its position.

Explanation:

Consider an example where a ball is thrown from a tall building. The point at which the ball is at its maximum height is said to have the maximum potential energy. As the ball gradually falls down, the potential energy decreases and turns into another form of energy, kinetic energy (energy in the form of motion). The ball at its peak position had stored energy, however, as soon as it begins moving, the stored energy will become less.  

You can think of it this way where the ball has less and less distance to cover when falling downwards from the building. This shorter distance covered by the ball is proportional to the potential energy, so when the ball is about to hit the ground, the potential energy will be close to 0.

I hope this makes more sense!

Answer:

option B is the right answer it helps in transfer of food.

The parts of the text on the page that use examples of how the flow of matter through a system is energy driven and has the capacity to do work are;

1) The flow of water down rivers passing through hydro power dams to perform the following works;

2) The flow of electrons that corresponds to the flow of electricity (in the reverse direction) to perform the following works;

3) The lifting of the hammer by the cam which gains gravitational potential energy that is converted to kinetic energy as the hammer drops

The hammer is repeatedly lifted and dropped by the cam to do the following work

4) The chemical potential energy stored in bonds by virtue of the relative atomic distances which produces kinetic energy from the chemical potential energy

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