Can someone help me please. This is the last day

Answer:

false

Explanation:

According to the law of conservation of energy, energy can neither be created nor destroyed but can be converted from one form to another. Hence, the given statement is true.

According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of energy is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.

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they are not created or destroyed

Answer:

B

Explanation:

Answer:

C) B AND C

Explanation:

points

Answer:

A, option is the correct answer of this question

Answer:

The atoms of chlorine are held together by non-polar covalent bonds. Covalent bonds are formed between two or more atoms having zero or very small electronegativity difference. For homonuclear molecules where the two bonding atom are of the same kind, the electronegativity difference is zero.

C. Atoms of chlorine (CI)

A covalent bond is created when the electrons from the two involved atoms are shared equally.The pair of electrons involved in this kind of bonding is referred to as the shared pair or bonding pair. Here the atoms of chlorine have non-polar covalent bonds. The correct option is C.

A non-polar covalent connection is created when atoms with an equal amount of electrons share one another. The electronegativity of the two atoms is equivalent. When two atoms with similar electron affinities join together, like in the case of diatomic elements, it happens.

Non-polar covalent compounds are those in which there is no variation in electronegativity. In these compounds, the electronegativity does not change, preventing the motion of the bond pair's electrons in the direction of the linked atoms.

As a result, a molecule is non-polar and non-conducting since there is no bond or dipole moment between its atoms and no buildup of charges on the atoms.

Thus the correct option is C.

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The wavelength of the wave in brass medium, given that the wave has a frequency of 300 Hz is 16 m (Option D)

The wavelength of a wave is defined according to the following formula:

Velocity (v) = wavelength (λ) × frequency (f)

Divide both sides by frequency

Wavelength (λ = Velocity (v) / frequency (f)

With the above formula, we can obtain the wavelength of the wave in the brass medium. Details below:

Wavelength (λ = Velocity (v) / frequency (f)

Wavelength in brass = 4700 m/s / 300 Hz

Wavelength in brass= 16 m

Thus, we can conclude that the wavelength is 16 m (Option D)

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Answer:

D. The cup reflects yellow light but absorbs all other colors of light.

Explanation:

The cup in the shop appears yellow because the cup reflects yellow light but absorbs all colors of light.

Due to the materials the cup is made of, it is able to specifically reflect yellow and absorb other radiation types.

The color we see are products of the part of visible radiations they reflect.

The cup in this instance reflects yellow and absorbs other color.

Answer:

Mass

Explanation:

Answer:

Yes

Explanation:

The rate at which a solute dissolves depends upon the size of the solute particles. Dissolving is a surface phenomenon since it depends on solvent molecules colliding with the outer surface of the solute.

Brainliest?

Answer:

the remains of an animal or plant preserved within a layer of rock otherwise A.

A fossil is the remains of an animal or plant preserved within a layer of rock. The correct option is A.

Fossils are the preserved form of animals or plants that are preserved on rocks or deep in the earth's crust and did not get damaged. They are discovered in the digs that are done by paleontologists.

The bones and sometimes dry skins and hairs, and teeth are also found that are preserved. These fossils help in studying animals and plants that were present in former times.

They do not get destroyed because they are preserved in rocks and stones. We got to know about dinosaurs by their fossils. There are different types of fossils are found.

Thus, the correct option is A. The remains of an animal or plant are preserved within a layer of rock.

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Answer:

the answer to this problem is before

Explanation:

Answer:

double displacement (metathesis) hope that helps!(^_^メ)

Explanation:

meh.

Answer:

ok, whats the question

Explanation:

Answer:

C)95.2

Explanation:

Given parameters:

Expected yield  = 5000kg

Experimental  yield  = 4760kg

Unknown:

Percentage yield  = ?

Solution:

The percentage yield of the substance is determined by find the ratio of the true experimental yield to the expect yield and multiply by 100;

  Percentage yield  = [tex]\frac{4760}{5000}[/tex] x 100 = 95.2%

Answer: Mantle and core are the two layers of the earth that have convection currents.

Explanation:

The mantle and outer core are the two layers that are associated with the convection currents. In the mantle the convection currents occur due to the heat emerging out of the core also mantle region releases heat. If the transfer of heat or convection currents stop then the mantle will not flow and the core will not produce magnetic field at all. This will lead to coldness in earth and earth will lose the protection from harmful radiations.

Answer:

I think it's alkali metals

Answer:

[tex]its \: fluorine \: and \: it \: belongs \: to \ : \\ 17th \: family \: noble \: gases[/tex]

Answer:

false it removes carbon dioxide                         ......The heart pumps blood to all parts of the body. Blood provides oxygen and nutrients to the body and removes carbon dioxide and wastes. As blood travels through the body, oxygen is used up,

Explanation:

Oxygenated blood travels from the lungs through the pulmonary veins and into the left side of the heart, which pumps the blood to the rest of the body (see Function of the Heart). ... Then the blood is pumped through the pulmonary artery to the lungs, where it picks up oxygen and releases carbon dioxide.

Answer:

true because your heart contains blood that flows through you body system

Answer:

yes mass conservation is in 2Na+2H2O=2NaOH+H2​

Explanation:

it tells how many atoms or molecules of a reactant or a product take part in the reaction

Answer:

B. Sun

Explanation:

While what exactly qualifies as "living" can be contested when talking about viruses, bacteria, etc. It is commonly accepted that Bacteria, Fungi and Animals (Cows) are all organisms. The Sun, however is no organism.

Answer:

Man-made resources

Explanation:

Humanized resources are items or substances that have value to human lives that do not occur in the natural world. Examples of man-made resources include plastic, paper, soda, sheet metal, rubber and brass. These contrast with natural resources, such as water, crops, sunlight, crude oil, wood and gold.

Answer:  1 mol of Zn is 65.38g

Explanation: To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn. Hence, 1.34 g of Zn contains 0.020 moles of Zinc.

0.34 mole of atoms in 22.5 g Zn.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

To find the number of moles of Zn, we divide the given amount of Zn by the molar mass of Zn.

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]Moles = \frac{22.5}{65.38 u}[/tex]

Moles = 0.34 mole

Hence, 0.34 mole of atoms in 22.5 g Zn.

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Answer:

d

Explanation:

atoms join together to produce elements

Answer:

An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element's atoms have the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical reactions.

Explanation:

Answer:

Try everything

1. How many moles of nitrogen gas are in 1.54x10^26 molecules? How many atoms?

2. How many molecules of water are in 3.45 moles of water?

3. How many atoms of C are in 2.00 moles of Cv6Hv12Ov6? (v means the number is below)

Explanation:

Answer:

Conduction

Explanation:

Answer: The answer would be A conduction

Answer:

It is position 3

Explanation:

Because the further the magnets are the higher the potential energy, and in position 3 the globe is the furthest from the base meaning that in base 3 the magnetic potential energy is the highest or greatest there.

Answer:

ok, maybe draw like a few plants and dear, you know and draw them out of cells, like the shape. so like a bunch of cells together making the shape of a deer or plant and stuff. i hope this helps

Explanation:

Answer:

c

Explanation: