Which statement accurately describes the movement of Earth’s plates due to convection currents?

Answer:

Number of energy levels that the element has.

Explanation:

The period number (n) is the outer energy level that is occupied by electrons. The period number that an element is in, is the number of energy levels that the element has.

Answer:

1st answer choice

P4O6 + 2 O2 -> P4O10

Explanation:

You need to cancel out reactants and products that are the same.

P4 cancels out because it appears in both reactants and products

We get 2 O2 in the reactants because 5-3= 2

Thus, answer choice 1 is correct.

Answer:

d. 0.9 mol

Explanation:

On this case we have to start with the formula of acetylene:

[tex]C_2H_2[/tex]

Now we can write the chemical reaction of combustion:

[tex]C_2H_2~+~O_2~->~CO_2~+~H_2O[/tex]

The next step is to balance the reaction:

[tex]2C_2H_2~+~5O_2~->~4CO_2~+~2H_2O[/tex]

The molar ratio between [tex]C_2H_2[/tex] and [tex]CO_2[/tex] is 2:4, so:

[tex]0.3~mol~C_2_H_2\frac{4~mol~CO_2}{2~mol~C_2H_2}=0.6~mol~CO_2[/tex]

The molar ratio between [tex]C_2H_2[/tex] and [tex]H_2O[/tex] is 2:2, so:

[tex]0.3~mol~C_2_H_2\frac{2~mol~H_2O}{2~mol~C_2H_2}=0.3~mol~H_2O[/tex]

The total moles would 0.6 + 0.3=0.9 moles.

I hope it helps!

Answer:

kinetic energy. (General Physics) the energy of motion of a body, equal to the work it would do if it were brought to rest. The translational kinetic energy depends on motion through space, and for a rigid body of constant mass is equal to the product of half the mass times the square of the speed.

Answer:it is the simplest one

the energy possessed by a body due to its motion is called kinetic energy

K.E.=[tex]\frac{1}{2}[/tex]mv²

Answer:

Explanation:

B.) Saturated

A saturated solution is when the maximum amount of solute that could be dissolved in that solvent volume at that temperature and pressure has been dissolved, adding more solute beyond this point would lead to the additional solute not dissolving in the solvent. When the maximum solute concentration in the solution that can be dissolved has been reached the solution is said to be saturated.

Hope This Helps??

Answer: 1. There are [tex]0.20\times 10^{23}[/tex] molecules of sulfuric acid  in the solution.

2.  0.093 moles of baking soda have been used.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

1. [tex]\text{Number of moles of sulpfuric acid}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{3.2g}{98g/mol}=0.033moles[/tex]

1 mole of [tex]H_2SO_4[/tex] contains = [tex]6.023\times 10^{23}[/tex] molecules of sulfuric acid

Thus mole of [tex]H_2SO_4[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.033=0.20\times 10^{23}[/tex] molecules of sulfuric acid

There are [tex]0.20\times 10^{23}[/tex] molecules of sulfuric acid  in the solution.

2.  [tex]\text{Number of moles of baking soda}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{7.8g}{84g/mol}=0.093moles[/tex]

0.093 moles of baking soda have been used.

Answer:

The Healthcare system should be a welcome place to the different tiers of people in the society. There should be zero form of discriminations and everyone should be should be treated in the same way. Defaulters should be frowned at and adequate punishments should be meted out. There should be strict accountability of the funds made available to the healthcare centers to prevent diversion and any corrupt practices. These systems need to be in place to ensure fairness in healthcare.

alkali metals

a.pex

yes

Answer:

Your question is somewhat poorly worded, even so what I can contribute is the statement is false, since the salt is sodium chloride, where its severe chemical formula NaCl, is a SALT not an acid and if it dissolves in water, seriously the solute of a solution, where water plays the role of the solvent

Explanation:

Sodium chloride is a binary salt, very easy to dissolve in water, it is also called the famous table salt, since it can be ingested in food even though it is not so recommended against high blood pressure conditions.

Answer:

i just answered this and its a

Explanation:

Answer:

In order to take steps by humans for controlling the change in climate.

Explanation:

It is important that scientist find out the change which occurs in the climate with the passage of time by performing experiments and also repeat the experiments in order to verify their findings. Due to these experiments, scientists also find out the reasons behind of climate change which enable us to take steps in preventing the change that occurs in the environment. it is also important for scientists to be able to explain how they know that climate has changed over time in order to explain that he is not assuming or making predictions, he has to provide evidence for his statement which is only be possible through experiments.

Answer:

c

Explanation:

the mitochodria is the protien power house of the cell

Answer:

calculate grams and use mole ratio lol

Explanation:

Answer:

Explanation:

23

Answer:

first answer

Explanation:

atomic number of bromine is 35

[tex]1{s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 3 {d}^{10} 4 {s}^{2} 4 {p}^{5} [/tex]

Answer:

1s22s22p63s23p64s23d104p5

Explanation:

;)

Answer:

To separate an insoluble solid from a soluble solid: Mixing the mixture with water, filtering out the insoluble solid, and then evaporating the water to isolate the soluble solid.

Explanation:

Answer:

Mixing the mixture with water, filtering out the insoluble solid, and then evaporating the water to isolate the soluble solid

Answer:

yh you are correct. the pattern is correct! :)

Answer:

Yep! :)

Explanation:

Answer:

C7H16 + 11O2 = 7CO2 + 8H2O

Explanation:

Start by balancing the C and H in C7H16 by adding the coefficient of 7 for CO2 because there are 7 C's in C7H16. Similarly, since there are 16 H's in C7H16, balance it by adding the coefficient of 8 to the H2O, which will result in 16 H's.

Finally, add up the O's on the right side and balance it by adding the appropriate coefficient on the O2. On the right, there are 22 O's, so balance the equation by adding the coefficient of 11 on the left for the O2.

Answer:

Minerals

Explanation:

I looked it up on google. Thanks.

Answer: 211.2 grams

Explanation:

To calculate the number of moles for given molarity, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution in L)}}[/tex]     .....(1)

Molarity of [tex]KBr[/tex] solution = 1.7 M

Volume of solution = 3.5 L

Putting values in equation 1, we get:

[tex]1.7M=\frac{\text{Moles of}KBr}{3.5L}\\\\\text{Moles of }KBr=\{1.7mol/L\times 3.5L}=5.95moles[/tex]

The balanced chemical reaction is:

[tex]Cl_2+2KBr\rightarrow 2KCl+Br_2[/tex]

According to stoichiometry:

2 mole of KBr requires = 1 mole of [tex]Cl_2[/tex]

5.95 moles of KBr requires = [tex]\frac{1}{2}\times 5.95=2.975[/tex] moles of [tex]Cl_2[/tex]

Mass of [tex]Cl_2=moles\times {\text {Molar mass}}=2.975mol\times 71g/mol=211.2g[/tex]

Thus 211.2 grams of chlorine gas are needed to react with 3.5 liters of a 1.7 molar potassium bromide solution

Answer:

Every species is made of different elements.

Explanation:

Living organisms are classified by their species. Species refer to a group of closely related individual organisms which are callable of interbreeding with each other and exchanging genetic material.

Member of a species have similar genetic make up and often look alike, it is the lowest taxonomic rank of closely related organisms.

Members of of different species are often composed of different elements. Since individual organisms are members of a given species, we can say that every species of organisms are made up of different elements.

______________________________

Solution,

Mass=500g =500/1000=0.5 kg

gravity(g)=9.8m/s^2

Now,

Weight= m*g

= 0.5*9.8

=4.9 N

So the weight of the block is 4.9 Newton

hope it helps...

Good luck on your assignment

_______________________

Answer:

3.34x10¹⁶ molecules of aspirin are in a drop of blood

Explanation:

The recomended dose of aspirin in blood is 100.0μg/mL =

1x10⁻⁴g aspirin / mL of blood.

In a drop (0.100mL) there are:

0.100mL ₓ (1x10⁻⁴g aspirin / mL of blood) = 1x10⁻⁵g aspirin.

Molecular mass of aspirin is:

9C = 12.01g/mol ₓ 9 = 108.09g/mol

8H = 1.01g/mol ₓ 8 = 8.08g/mol

4O = 16g/mol ₓ 4 = 64g/mol

108.09 + 8.08 + 64 = 180.17g/mol

Thus, moles of aspirin in 1x10⁻⁵g are:

1x10⁻⁵g ₓ (1mol / 180.17g) = 5.55x10⁻⁸ moles of aspirin

In 1 mole, you have 6.022x10²³ molecules, thus:

5.55x10⁻⁸ moles of aspirin ₓ (6.022x10²³ molecules / 1 mole ) =

Answer:

Purple flowers are dominant

Explanation:

Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the way the particles inside them differ.

In a gas, the molecules are spread wide apart and moves freely at high speeds

In a liquid, the more closer to each other and will vibrate or slip past each other

In a solid, the molecules are tightly packed, making no room for each other and harder to move. These molecules vibrate and jiggle but, don't move

Answer:

D

Explanation:

Scientists always perform tests and observe and measure in the physical world to prove their points or answer their questions.

Answer:

D. Thermal conduction is blocked by the flip-flops.

Explanation:

Convection is a process of heat transfer which involves fluids( liquid or gas). This however rules convection out of the answer.

Radiation involves heat transfer from the sun to bodies on earth.

Conduction involves heat transfer between two solid bodies. Hot beach sand and flip-flops are solid bodies which validates thermal(heat) conduction.

Answer:

Solute

Explanation: