whoever answers this first gets brainly

Answer:

His speed was 2 m/s, and his velocity was 0

Explanation:

In physics, speed of an object is defined as the change in position with the change in its time. While velocity may be defined as the change in the position of the body with respect to the time taken.

Speed in a scalar quantity which means it has only magnitude while velocity has both magnitude and direction.

To determine change in velocity both direction as well as magnitude has to be changed.

In the context, Kai was 200 m of the library in the north direction. Now for the round trip to the library and back to his position, Kai took 200 seconds time to cover the distance.

So for the round trip, the speed of Kai would be 2 m/s abut the velocity of Kai is 0 as the displacement of Kai is 0.

Answer:

speed  2 m/s, his velocity  0

: B

Answer:

There are 20 atoms in hydrogen.

Explanation:

Multiply Coefficient with Hydrogens subscript. In this case the coefficient is a 4 so you multiply that with Hydrogens subscript which is 5. So it would be (4)(5)=20

Answer:

i think it is b im not sure

Explanation:

Answer: According to the electromagnetic theory of the 19th century,

it had become clear that electricity and magnetism were related, and their theories were unified: wherever charges are in motion electric current results, and magnetism is due to electric current! Hope this Helps!

Answer:

the case of a wave, the speed is the distance traveled by a given point on the wave (such as a crest) in a given interval of time. In equation form, If the crest of an ocean wave moves a distance of 20 meters in 10 seconds, then the speed of the ocean wave is 2.0 m/s.

Explanation:

Answer:

The volume of CO₂ produced is 8.4 L

Explanation:

The mass of propane in the reaction C₃H₈ = 20 grams

The mass of, oxygen, O₂ in the reaction = 20 grams

The produce of the reaction are carbon dioxide, CO₂ and water, H₂O

The balanced equation of the (combustion) reaction can be presented as follows;

C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)

Therefore, one mole of propane, C₃H₈, reacts with five moles of oxygen, O₂, to produce three moles of carbon dioxide, CO₂, and four moles of water molecules, H₂O, as steam

The number of moles = Mass/(Molar mass)

The molar mass of propane, C₃H₈ = 44.1 g/mol

The number of moles of propane in 16 grams of propane = 16/44.1 ≈ 0.3628 moles

The molar mass of oxygen, O₂ = 32.0 g/mol

The number of moles of oxygen in 20 grams of propane = 20/32 ≈ 0.625 moles

Therefore;

Given that 1 mole of C₃H₈ reacts with 5 moles of O₂

1 mole of O₂ will react with 1/5 moles of C₃H₈

0.625 moles of O₂ will react with 0.625/5 = 0.125 moles of C₃H₈ to produce 3 × 0.125 = 0.375 moles of CO₂

1 mole of an ideal gas occupies 22.4 L at standard temperature and pressure

Taking CO₂ as an ideal gas, we have;

0.375 mole of CO₂ will occupy 0.375 × 22.4 L = 8.4 L

Therefore, the volume of CO₂ produced = The volume occupied by the 0.375 moles of CO₂ = 8.4 L.

Answer: Diagram 4

Explanation: Diagram 1 represents a state in which particles are closely packed , thus cannot be a representation of gas.

Diagram 2 represents  a state in which particles are loosely packed , thus can be a representation of gas.

Diagram 3 represents  a state in which particles are closely packed , thus can be a representation of a solid.

Diagram 4 represents  a state in which particles are loosely packed , thus can be a representation of gas. It also represents the particles in ionized form. Particles are existing as ions bearing positive and negative charges.

Explanation:

Answer:

D

Explanation:

Answer:

got to be salt in warm water as for the bread it produces mold and also bleach is a chemical

The given question is incomplete. The complete question is :

Welding is an industrial process that is used to join pieces of metal. A certain mixture of gases used in welding is composed of carbon dioxide and argon. The partial pressure of carbon dioxide is 0.080 atm and the partial pressure of argon is 0.24 atm. What is the total pressure of the mixture.

Answer:  0.32 atm

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

[tex]p_{total}=p_{CO_2}+p_{Ar}[/tex]

Given : [tex]p_{total}[/tex] =total pressure of gases = ?

[tex]p_{CO_2}[/tex] = partial pressure of carbon dioxide = 0.080 atm

[tex]p_{Ar}[/tex] = partial pressure of argon = 0.24 atm    

putting in the values we get:

[tex]p_{total}=0.080atm+0.24atm[/tex]  

[tex]p_{total}=0.32atm[/tex]

Thus the total pressure of the gases is 0.32 atm

Answer:

C. Magnesium

Explanation:

Zinc sulphate (ZnSO4) will react fastest with Magnesium (Mg) because magnesium is more reactive than Zinc and other given elements.

Zinc sulphate (ZnSO4) reacts with Magnesium (Mg) and undergo displacement reaction. Zinc is displaced by magnesium and form Magnesium Suphate (ZnSO4).

                 ZnSO4 + Mg => MgSO4 + Zn

Rate of reaction will decrease if there is an increase in product concentration.

If one (or more) of the reactants or products concentrations are raised, the equilibrium will change to lower the concentration. Alternately, if the temperature is lowered, the equilibrium will change to favor the exothermic process, which will raise the temperature.

Hence, there is decrease in rate of reaction as the product concentration increases.

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Answer:

C. A long chain of carbon atoms with hydrogen atoms attached to them

Explanation:

For example, the main component of flour is starch and starch is a polymer.

Now, Starch is a polymeric carbohydrate that consists of a large number of glucose units which are bonded by chemical bonds known as glycosidic bond. It's also known that Starch is a white, tasteless and odorless powder that is not soluble in alcohol or even cold water.

Thus, we can say that polymer is a long chain of carbon atoms with hydrogen atoms attached to them.

Option C is correct.

Answer:

C. A long chain of carbon atoms with hydrogen atoms attached to them

Explanation:

For example, the main component of flour is starch and starch is a polymer.

Now, Starch is a polymeric carbohydrate that consists of a large number of glucose units which are bonded by chemical bonds known as glycosidic bond. It's also known that Starch is a white, tasteless and odorless powder that is not soluble in alcohol or even cold water.

Thus, we can say that polymer is a long chain of carbon atoms with hydrogen atoms attached to them.

Answer:2...concentration of Hydrogen ions is 10 times more

Explanation:

Answer:

Decomposition

Explanation:

One reactant has formed two products

It was  important to decide between the lunar orbit Rendezvous method and the earth orbit rendezvous method near the beginning of project Apollo because Engineers could not decide which method to use until they had built and tested the lunar miss vehicle and is therefore denoted as option A.

This was a scientific exploration of the Moon in which instruments were deployed to measure the distance from the Moon to the Earth.

This was also set up in other to measure the Moon's seismic activity and involved the use of spacecraft but there was difficulty in selecting between the lunar orbit Rendezvous method and the earth orbit rendezvous method near the beginning of project Apollo.

This was because if the earth orbit rendezvous failed, the threatened astronauts could be brought back home easily while if a rendezvous around the moon failed, the astronauts would be too far away to be saved which is therefore the reason why option A was chosen as the correct choice.

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Answer:

The type of bonding that occurs between metals and non metals is ionic bonding,so the type of bond between Na and Br is an ionic bond

AnswU GOT THIS!!!!!!!!!!!!!

Explanation:

Answer:

protein??

Explanation:

im not sure, but I could be wrong!!

Answer:

110.7 kpa or 1.097 atm your choice of pressure units

Explanation:

We can assume the Volume is constant since we are not told other wise and it is indeed a car. We can Use P1/T1= P2/T2

So (T2xP1 )/ T1 = P2

(318Kx101.3kpa)/291k = 110.7 kpa or 1.097 atm your choice of pressure units

if your wondering why i used Kelvin gas laws are always in units of Kelvin

Answer:

D

Explanation:

tropical areas receives the most solar radiation because the sun's rays are nearly perpendicular to the earths surface

Answer:Chemical reaction

Explanation:

The main concept that must be applied to determine the coefficients (amount of each item) is that there must be equal amounts of each element on each side of the equation. We are not destroying or creating new atoms. In this case, the unbalanced reaction formula is:

B

r

2

+

K

I

=

K

B

r

+

I

2

There are a two problems we need to solve before it will be balanced:

There are two moles of Iodine atoms (

I

) on the right side of the equation, while there is only one mole on the right side.

There are two moles of bromine (

B

r

) atoms on the left side, while there is only one on the right.

Since there are two moles of bromine atoms on the left side, we need two moles on the right as well. We can do this by adding a coefficient of two to the

'

K

B

r

'

term in the equation. Our now modified equation looks like this:

B

r

2

+

K

I

=

2

K

B

r

+

I

2

There is one mole of Iodine atoms on the left, and two on the right. To fix this, we add a coefficient of two to the

'

K

I

'

term. The resulting equation is below.

B

r

2

+

2

K

I

=

2

K

B

r

+

I

2

Bonus step: We can also put ones in front of the coefficient-less species. This is like changing a phrase from "an apple" to "1 apple". It is the exact same thing, but makes it a little more clear sometimes. This would like like this:

1

B

r

2

+

2

K

I

=

2

K

B

r

+

1

I

2

Can you see that there is now an equal amount of each element on each side of the equation? That means that it is balanced.

Answer: its a reduction and an oxidation reaction

Explanation:

Answer:

Cuando uno monta en bicicleta, el cuerpo convierte la energía química de los músculos para producir energía mecánica.

Explanation:

Answer:

The answer is c radio --> infrared --> ultraviolet --> gamma

Explanation:

I just did it

Answer:

C

Explanation:

just did it

Answer:

Plate tectonics...Plate comes first

Tectonic Plates... Tectonic comes first...

Answer:

plate tectonics is a scientific theory that describes the large-scale motion of Earth's lithosphere

tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust

Explanation:

Answer:

Mass = 99.875 g

Explanation:

Given data:

Number of atoms of Ar = 1.506× 10²⁴

Mass in gram = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

1.506× 10²⁴ atoms  × 1 mol / 6.022 × 10²³ atoms

0.25× 10¹ mol

2.5 mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 2.5 mol × 39.95 g/mol

Mass = 99.875 g

Answer: its D

Explanation: i just got the question right

In scientific notation, often known as power-of-10 notation, extremely big and small numbers are written. Scientists write very large numbers by express the numbers using scientific notation.

Numbers that are either too large or too little to be readily stated in decimal form can be expressed using scientific notation. It is also known as standard form in the UK and scientific form, standard index form, and standard form.

The main goal of scientific notation is to simplify computations using numbers that are abnormally big or tiny. The following examples demonstrate how all the digits in a number in scientific notation are relevant, since zeros are no longer utilized to set the decimal point.

When working with very big or very small numbers, scientists, mathematicians, and engineers employ scientific notation. Large and tiny numbers can be represented in a form that is simpler to read using exponential notation.

Thus, option D is correct.

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Answer:

Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.

Explanation: