Which is an example of kinetic energy?

A. A stretched rubber band
B. Wind
C. Water in a reservoir
D. Natural gas
E. An object suspended above the ground

Answer:

5000mm

Explanation:

10mm makes 1 cm

so if we compare them:

10mm-->1cm

x -->500cm

now cross multiply:

1x-->5000

divide both sides by 1 for x to be alone

therefore we get x=5000

Answer:

distance decreases and force increases

Explanation:

When we use a simple machine to do work, the distance decreases, the force increases. Hence, option D is correct. Because, these parameters are in inverse proportion.

Force is an external agent acting on a body to change its motion. There are various kinds of force such as frictional force, magnetic force, gravitational force etc.

Work done is the effectiveness of the machine to use the force to make the maximum displacement. Work done is the product of force and distance.

W = F.ds

As per this relation, the force acting on large distance makes greater work done. However,

F = W/ds.

Hence, as the distance increases, the force is decreasing. Therefore, option D is correct.

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Answer:

An equal force acts in the opposite direction.

Explanation:

Answer:

Metallic character increases down each Group of the Table as the outer electrons are further from the nucleus and require less energy for their removal. (a) metallic character decreases from left to right in each Period.

Explanation:

The metallic character increases down each Group on the periodic table.

The metallic character decreases from left to right in each Period.

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Answer:

Selenium

adadadadad

Explanation:

if u ask which group

so it is halogen

or u ask which type of matter

then liquid

A. putting a piece of soft iron in an outlet

Answer:

protons: 8

neutrons: 9

Explanation:

the atomic number tells you how many protons are in a element. The mass is the number of protons + neutrons.

17 - 8 = 9 neutrons

There are 8 protons and 9 neutrons in the nucleus of the oxygen atom.

The atomic number of an atom is the number of protons in atom of an element.

It can also be defined as the number of electrons in a neutral atom of an element.

The mass number is the number of protons and neutrons in the nucleus of an atom of an element.

The proton number of the oxygen atom is 8

The neutron number is 17 - 8 = 9

Therefore, in the nucleus of the oxygen atom, there are 8 protons and 9 neutrons.

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Answer:

Transition Metal

Explanation:

Hey there is a really easy tool called PTable that is an interactive periodic table that does all kind of things. needed in Chem

Answer:

158 grams

Explanation:

The relationship between an hydrogen atom's energy levels, sublevels and atomic orbitals lies in the fact that hydrogen atom has a shell with energy level of 1 and the energy sublevels are similar as there's only one and have the same energy, and lastly, only one atomic orbital exists in a hydrogen atom

Ultimately, the hydrogen atom has only one electron In the energy level 1, sublevels with equal energy as there are no sublevels in the energy level 1 and only the 1s atomic orbital.

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Answer:

Its C

Explanation:

The law of conservation of mass says no atoms can be created or destroyed just rearranged so the mass at the beginning before the reaction would stay the same after it

Considering the Law of Conservation of Matter, the correct answer is the third option: the total mass of the products will be the same and has a value of 58.44 amu.

The Law of Conservation of Matter is also called the law of conservation of mass or the Law of Lomonósov-Lavoisier. This law postulates that "the mass is not created or destroyed, only transformed."

This means that the reagents interact with each other and form new products with physical and chemical properties different from those of the reagents because the atoms of the substances are ordered differently. But the amount of matter or mass before and after a transformation (chemical reaction) is always the same, that is, the quantities of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends.

In other words, then the mass before the chemical reaction is equal to the mass after the reaction.

So, in this case, if the total mass of the reactants is 58.44 amu, the total mass of the products will be the same and has a value of 58.44 amu.

Finally, the correct answer is the third option: the total mass of the products will be the same and has a value of 58.44 amu.

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Answer:

D. Communication of results

Answer:

b.

conclusion

because it gives the overall information about the experiment

Answer:

1223.08632 I think....

Answer:

53

Explanation:

it is easy divide 100 by 200 and get 100

Answer:

to the right of the steps

Explanation:

the metals stop at the stair step

Explanation:

beryllium must loss 2 electrons to form a stable octet to its nearest noble gas Helium.

It can loss electron because it is a metal and is placed in 2group and 2 period in group of alkaline earth metals.

hope this helps you to.

Answer:

Most of the atom is empty space. The rest consists of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. The nucleus is small and dense compared with the electrons, which are the lightest charged particles in nature..

Explanation:

Hope it helps you..

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Answer:

In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.

In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling at a speed v is 1/2*mv^2. In relativistic mechanics, this is a good approximation only when v is much less than the speed of light.

The standard unit of kinetic energy is the joule, while the English unit of kinetic energy is the foot-pound.

Explanation:

Don't directly copy and paste this because you will get flagged for plagiarism. Just type this out in your own words and change a few of the words to their synonyms.

the only report that will fool the teachers

Melting points of enantiomers will not compare to each other as they have same M.P. and Diastereoisomers are compared on the basis of melting point.

Stereoisomers are those isomers which are having the same molecular formula but different spatial arrangemet of atoms within the molecule.

Hence, only diastereoisomers are compared on the basis of melting point.

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Answer:

false

Explanation:

they dont spontaneoulsy form water

Answer:

It's from the quation:

[tex] \boxed{ \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }}[/tex]

(How did I know?)

I learnt it while studying the elements of group 1.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

K, here, is Potassium. It's position in the periodic table is Group 1, Period 4.

Valance electrons of elements of this group contribute to the valency of the group's elements I.e.,

valency of Alkali metals is 1!

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

What are hydroxides?

Hydroxides of an element comprises one atom each of oxygen and Hydrogen bonded together, acting as an anion, the hydorxide anion — OH-.

Example:

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

In the question, The reactants are missing but the products are known, that are, Potassium Hydroxide and water.

Keeping the above mentioned property in mind, the reactants come clear as Potassium(K) and Cold water(H2O).

that makes the equation:

[tex] \mathsf{K + H_2O \rightarrow \: KOH + H_2 }[/tex]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

For an equation to be balanced, the number of atoms of each elements on both side of the equation must be equal.

Number of atoms of each element on the LHS:

(subscript in front of an atom represents its number of atoms in the compund)

Number of atoms of each element on the LHS:

The number of Hydrogen atoms on boths sides is NOT balanced!

Hit and trial method:

If we add a "2" in front of K, H2O and KOH

[tex] \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }[/tex]

Number of atoms on both the sides become equal.

(TIP: This comes thru practice:/. but main point is even out the oxygen and Hydrogen atoms first. like if it's 3 multiply it by 2 and you get an even number, I.e., 6)

Number of atoms of each element on the LHS:

Number of atoms of each element on the LHS:

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Hence, the balanced form of the equation is:

[tex] \boxed{ \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }}[/tex]

Here is your answer look at your image below

Answer:

A mineral has to be naturally occurring, inorganic, solid, have a crystal structure, and have a definite chemical composition.

Explanation:

Since we are starting from the number of atoms of Nickel, we need to know two sets of formulas:

mass = moles × molar mass

moles = atoms ÷ Avogadro's Number

⇒ mass = (atoms ÷ Avogadro's Number) ×  molar mass

   mass = [(7.4 × 10¹⁵ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (58.69 g/mol)

             = 7.21 × 10⁻⁷ g

Answer:

31: 1366.82

32: 6.45062

33: 12.50400

34: 210.42700

35: 63.88200 cm

36: -970.8772

Explanation:

4.550 x 300.4 = 1366.82

2.45002 + 4.0006 = 6.45062

26.004 - 13.5 = 12.50400

2.667 + (5.6 x 37.1) = 210.42700

2.34 x 4.55 x 6.0 = 63.88200

4.60 x 5.16 x 1.05 + 6.2 - 1002 = -970.8772

Answer:

It allows the traveler to justify questionable expense items.

hope that helped <3

Arranging the pairs from strongest to weakest attraction :

Covalent bonds are the strongest bonds because it involves the sharing of electrons between two binding atoms therefore the atoms are not dissociated easily. Also covalent bonds are divided into ;

While Ionic bonds involves the transfer of electrons from a donor atom to another atom and such bonds are easily broken and it is a weaker bond when compared to Polar and Nonpolar bonds. therefore polar molecule and ion bond pair is stronger than ion and ion pair.

Hence we can conclude that ranking  the pairs from strongest to weakest attraction is as follows;  Nonpolar molecule and Nonpolar molecule,  Polar molecule and Polar molecule,  Polar molecule and Ion,  Ion and Ion.

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Answer:

yes because its nuetrins notation

Answer: Scientists work independently to form theories about the Earth without sharing d

Scientists work independently to form theories about the Earth without sharing data.

Solar system is defined as the grouping of the eight planets and their moons in orbit around the sun, as well as other smaller bodies like comets, asteroids, and meteoroids.

It can also be defined as the Sun's orbiting objects are confined by gravity to one system.

An orbiting collection of planets, meteors, or other celestial bodies is referred to as a star system.
The Sun, an ordinary star, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto make up our solar system.

Our solar system is referred to as the "solar system" because our Sun is called Sol after the Latin word for Sun, "solis," and because anything related to the Sun is termed "solar."

Thus, scientists work independently to form theories about the Earth without sharing data.

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