CHEMISTRY!! Please help!!

Particles in a metal are held together by Covalent attractions. These are the strongest attraction or types of bonding

The bonds that hold atoms together to form molecules are called covalent bonds. They are pretty tough and not easily made or broken apart. It takes energy to make the bonds and energy is released when the bonds are broken.

For example, there is a covalent bonding between a Chlorine molecule. the two chlorine atoms are held strongly via covalent bonds.

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Answer:

10 m/s

Explanation:

100 meters covered in 10 seconds, so:

100 m / 10 s = 10 m/s

Answer:

Neither

Explanation:

None of the answer choices is the correct definition of erosion. Erosion is actually the removal of weathered materials and particle from the surface of rocks and soils.

Erosion is a serious problem in Agriculture as it removes rich and fertile soil cover. This therefore renders the soil barren and stripped of available nutrients.

Answer:

The process of breaking down rock and soil.

Explanation:

Answer:

Yes, it does have an important role in humanity!

Explanation:

In human life, refraction of light plays an important role. It has many applications in optics and imaging technology. Some of the applications are: Refraction concave and convex glasses are used to correct the refractive errors of human eyes.

its use full to humanity if you stay back jk

As you know, the stoichiometric coefficients attributed to each compound in the balanced chemical equation can be thought of as moles of reactants needed or moles of products formed in the reaction. Notice that the reaction requires 2 moles of hydrogen gas and 1 mole of oxygen gas to produce 2 moles of water.

I'm not exactly sure if this is right, but I still hope this helps none the less ^^

6 moles of H2O are produced from 3 moles of oxygen.

We know that one mole of water is formed from a half mole quantity of oxygen gas so in this way 3 moles of water is produced from using 1.5 moles of oxygen atom so we can conclude that 6 moles of H2O are produced from 3 moles of oxygen.

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Answer:

4P + 5O₂ —> P₄O₁₀

Explanation:

From the question given above, we obtained:

P + O₂ —> P₄O₁₀

The above equation can be balance as illustrated below:

P + O₂ —> P₄O₁₀

There are 4 atoms of P on the right side and 1 atom on the left side. It can be balance by 4 in front of P as shown below:

4P + O₂ —> P₄O₁₀

There are 10 atoms of O on the right side and 2 atoms on the left side. It can be balance by putting 5 in front of O₂ as shown below:

4P + 5O₂ —> P₄O₁₀

Now the equation is balanced.

Answer:

sperm cell

Explanation:

The male portion of a zygote is called the sperm cell. The sperm cell are produced by the male organism and they fertilize the eggs.

Answer:

[tex]\mathbf{C_4 H_{8}O_{4}}[/tex]

Explanation:

From the given information:

Assume the molecular formula to be: [tex]C_a H_{2a} O_{a}[/tex]

Then, the molecular mass will be = 12a + 2a + 16a = 30a  (since the C = 12, H = 2 & O = 16) respectively.

Thus;

30a = 120

a = 120/30

a = 4

Thus, the molecular formula:

[tex]=C_4 H_{2*4} O_{4}[/tex]

[tex]= \mathbf{C_4 H_{8}O_{4}}[/tex]

Heating a gas increases the kinetic energy of the particles, causing the gas to expand. In order to keep the pressure constant, the volume of the container must be increased when a gas is heated.

Answer:

the answer is c I tink good luck

Answer:

C. Warm surface water is reduced, causing colder conditions than normal.

Explanation:

During El Niño, trade winds are weak. During La Niña, it's the opposite. The surface winds across the entire tropical Pacific are stronger than usual, and most of the tropical Pacific Ocean is cooler than average. Rainfall increases over Indonesia (where waters remain warm) and decreases over the central tropical Pacific

Answer:

If the material is opaque, light is reflected or absorbed. If the material is transparent, all light is transmitted. If the material is translucent, the light is scattered. The higher the frequency, the more energy the light waves have. The lower the frequency, the less energy the light waves have.

Explanation:

I'm literally learning about it right now and I got it right.

Answer:

C = 107.97 mol/L

Explanation:

Given data:

Volume of solution = 1.38 mL (1.38 mL× 1 L /1000 mL = 0.00138 L)

Mass of ammonium sulfite = 17.36 g

Concentration of solution =?

Solution:

We will calculate the number of moles of ammonium sulfite.

Number of moles = mass/molar mass

Number of moles = 17.36 g / 116.15 g/mol

Number of moles = 0.149 mol

Concentration/molarity:

C = n/V

C = 0.149 mol / 0.00138 L

C = 107.97 mol/L

Answer:

0.39 moles

Explanation:

Given mass of calcium nitrate =64gram

Molar mass of calcium nitrate = 164 gram

No of moles = given mass/ molar mass

No of moles = 64/164

= 0.39 moles

Answer:

d

Explanation:

i think its d but im not sure.

Answer:

D.

Explanation:

Well waves forming in not an indication of a phase change, neither is splashing water. Water soaking into the sand could be a form of change, from condensation into precipitation but that is not what the example is speaking of. The change from water into vapor can be indicated by the loss of water in liquid form.

Answer:

the answer is : 28.6

1: 8+6+4+3 =21

2: there are 6 brown M&Ms = 6

3: %= 100

6×100÷21 = 28.57

round 1 Dec place = 28.6

Answer:

yes

Explanation:

Answer:

im pretty sure! good job :))

Explanation:

im sorry if it isnt in advance, hope this helped a little!

Answer:

12

Explanation:

The answer is 12 because You are looking for hydrogen which is the big H. you look to the number below it and it is 12. So H stands for hydrogen and there are 12 Hydrogen getting you your answer of 12.

Answer:

unit cells; lattice

Explanation:

Answer:

Remain the same.

Explanation:

The reaction of the temperature of the content of the container will remain the same because no heat energy is transfer from the container to the external environment due to insulating material of the container. Insulators are poor conductor of heat and electricity so the container is unable to absorb the heat energy produced during a chemical reaction and all energy of the product remain the same.

Answer:

False

Explanation:

In every substance, there is a valence band and there is a conduction band. The gap between the valence band and the conduction band determines Whether a substance is a conductor or an insulator.

Conductors have a narrow gap between the valence band and the conduction band while insulators have a large gap between conduction band and insulation band. However, elements with a large number of electrons in the valence band are non conductors.

Answer:

0.052636002587839 moles

Explanation:

im not sure so sorry if u get it wrong...

Answer:

0.0584 M

Explanation:

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

Mass of CaCl₂ = 0.808 g

Volume of water = 250 mL

Concentration of chloride =?

Next, we shall determine the number of mole in 0.808 g of CaCl₂. This can be obtained as follow:

Mass of CaCl₂ = 0.808 g

Molar mass of CaCl₂ = 40 + (35.5 × 2)

= 40 + 71

= 111 g/mol

Mole of CaCl₂ =?

Mole = mass / Molar mass

Mole of CaCl₂ = 0.808 / 111

Mole of CaCl₂ = 0.0073 mole

Next, we shall convert 250 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

250 mL = 250 mL × 1 L / 1000 mL

250 mL = 0.25 L

Next, we shall determine the molarity of CaCl₂. This can be obtained as follow:

Mole of CaCl₂ = 0.0073 mole

Volume of water = 0.25 L

Molarity of CaCl₂ =?

Molarity = mole /Volume

Molarity of CaCl₂ = 0.0073 / 0.25

Molarity of CaCl₂ = 0.0292 M

Finally, we shall determine the concentration of the chloride as illustrated below:

CaCl₂ <=> Ca²⁺ + 2Cl¯

From the equation above,

1 mole of CaCl₂ produced 2 mole of Cl¯.

Therefore, 0.0292 M CaCl₂ will produce = 0.0292 × 2 = 0.0584 M Cl¯.

Thus, the concentration of the chloride ion (Cl¯) in the solution is 0.0584 M

Explanation:

rain, snow, cloud, fog or dry deposition - Dry particles, or gas

Answer:

The elements of group 18 of the periodic table are known as noble gases or inert gases.

Explanation:

The noble gases are placed in group 18 of the periodic table.  These gases have a very low chemical reactivity, that is, little combination with other elements of the periodic table. For that reason they are called inert gases. This behavior is due to its electronic configuration, because its outermost layer or valence layer is always complete, being the stable element by itself, without the need to borrow or share electrons.

As mentioned, noble gases are not very reactive, that is, they do not usually form bonds between atoms. This means that they don't react much with other substances, they don't even react between atoms of the same gas.

In summary, the elements of group 18 are non-reactive elements.

Finally, the elements of group 18 of the periodic table are known as noble gases or inert gases.

Answer:

A - Liquid molecules forming a gas and gas molecules forming a

liquid are equal in number.

Explanation:

A P E X

Answer:

That the isotope H-1 is the most abundant in nature.

Explanation:

Hello!

In this case, since the average atomic mass of an element is computed considering the mass of each isotope and the percent abundance each, for hydrogen we would set up something like this:

[tex]m_H=m_{H_1}*\%abund_{H_1}+m_{H_2}*\%abund_{H_2}[/tex]

Moreover, since the isotope notation H-1 and H-2 means that the atomic mass of H-1 is 1 amu, that of H-2 is 2 amu and the average one is 1.0079 amu, we can infer that the most of the hydrogen in nature is H-1 as the most of it composes the average hydrogen atom.

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Explanation:

Work done = Force * Diatance

By applying this equation,

We have Work Done = (6.0N)(0.3m) = 1.8J.

Answer:

Explanation:

Formula used : Work = Force × Displacement

Work done = 6.0 Newton×0.3 meters = 1.8 joules