Can some please answer these two questions?

Answer:

yes

Explanation:

Answer:

im pretty sure! good job :))

Explanation:

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

Answer:

d

Explanation:

i think its d but im not sure.

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:

0.052636002587839 moles

Explanation:

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

Answer:

it is the one below that. NO, because it debt net the octet rule

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

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:

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.

Best regards!

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:

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

Answer:

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

liquid are equal in number.

Explanation:

A P E X

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.

Find more information about Covalent bonding here:

brainly.com/question/11674395

Answer:

Explanation:

N₂ (g ) + 4H⁺( aq ) + 4e⁻ = N₂H₄ ( aq )

H⁺ ion comes from acidic medium . 4 positive charge on proton is balanced by 4 electron to make left hand side neutral because right hand side is neutral .

How does the environment play an important role in creating petrified fossils?

The right conditions need to be present in order for fossilization to occur.

Drier environments, such as land, are more susceptible to the effects of erosion and so it is more difficult to preserve the organism before it decays.

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:

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

Answer:

A dam: 3

solar cells: 2

food: 1

a rocket: 1

Answer:

1: yes

Explanation:

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.

Learn more about mole here:https://brainly.com/question/1427235

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:

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:

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

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:

[tex]\rm C_4 H_8[/tex].

Explanation:

Look up the relative atomic mass of [tex]\rm C[/tex], [tex]\rm H[/tex], and [tex]\rm O[/tex] on a modern periodic table:

Calculate the molecular mass of [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex]:

[tex]M(\mathrm{CO_2}) = 12.011 + 2 \times 15.999 = 44.009\; \rm g \cdot mol^{-1}[/tex];

[tex]M(\mathrm{H_2O}) = 2 \times 1.008 + 15.999 = 18.015\; \rm g \cdot mol^{-1}[/tex].

Given the mass [tex]m[/tex] of [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] produced, calculate the number of moles of molecules that were produced:

[tex]\displaystyle n(\mathrm{CO_2}) = \frac{m(\mathrm{CO_2})}{M(\mathrm{CO_2})} \approx 0.80\; \rm mol[/tex];

[tex]\displaystyle n(\mathrm{H_2O}) = \frac{m(\mathrm{H_2O})}{M(\mathrm{H_2O})} \approx 0.80\; \rm mol[/tex].

Calculate the number of moles of [tex]\rm C[/tex] atoms and [tex]\rm H[/tex] atoms in these [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] molecules.

The combustion reaction here include two reactants: the hydrocarbon and [tex]\rm O_2[/tex].

As the name suggests, hydrocarbons contain only [tex]\rm C[/tex] atoms and [tex]\rm H[/tex] atoms. On the other hand, [tex]\rm O_2[/tex] contains only [tex]\rm O[/tex] atoms.

Therefore, all the [tex]\rm C[/tex] and [tex]\rm H[/tex] atoms in those [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] molecules are from the unknown hydrocarbon. (With a similar logic, all the [tex]\rm O[/tex] atoms in those combustion products are from [tex]\rm O_2[/tex].)

In other words, that [tex]0.20\; \rm mol[/tex] of this unknown hydrocarbon molecules contains:

Hence, each of these hydrocarbon molecules would contain [tex](0.80\; \rm mol) / (0.20\; \rm mol) = 4[/tex] carbon atoms and [tex](1.60\; \rm mol) / (0.20\; \rm mol) = 8[/tex] hydrogen atoms.

The molecular formula of this hydrocarbon would be [tex]\rm C_{4} H_{8}[/tex].

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:

[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]

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.