plz someone help me i dont get this and i need to finish this

Answer:

C

Explanation:

energy cannot be created or destroyed like solar energy for instance. it is already energy because it comes from the sun and for other reason.

Hope this helps!

Answer:

oxygen is the correct answer

Explanation:

you need oxygen in order to breath, eat, drink, and many other stuf! hope i helped!

Answer:

1.25 M

Explanation:

Step 1: Given data

Mass of KI (solute): 20.68 g

Volume of the solution: 100 mL (0.100 L)

Step 2: Calculate the moles of solute

The molar mass of KI is 166.00 g/mol.

20.68 g × 1 mol/166.00 g = 0.1246 mol

Step 3: Calculate the molar concentration of KI

Molarity is equal to the moles of solute divided by the liters of solution.

M = 0.1246 mol/0.100 L= 1.25 M

Answer:

The answer is 3

C2H5OH + O2 CO2 +H2O (unbalanced)

C2H5OH +3O2(g). 2CO2(g)+3H2O(balanced)

According to the balanced chemical equation, C₂H₅OH + 3 O₂[tex]\rightarrow[/tex] 2 CO₂ + 3 H₂O the coefficient of oxygen is three.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

Learn more about chemical equation,here:

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Answer:

[tex]V_{solution}=6.25mL[/tex]

Explanation:

Hello there!

In this case, given the by-volume percent and the volume of isopropyl alcohol as the solute, we can compute the volume of the solution via:

[tex]\% v/v=\frac{V_{solute}}{V_{solution}} *100\%\\\\V_{solution}=\frac{V_{solute}}{\% v/v} *100\%[/tex]

Now, we plug in the given data to obtain:

[tex]V_{solution}=\frac{2.5mL}{40\%} *100\%\\\\V_{solution}=6.25mL[/tex]

Best regards!

Explanation:

Yw ❤

Shorter people have a lower center of gravity. Taller people have a higher center of gravity. A lot of skateboarding tricks depend on the center of gravity.

Kinetic energy is a form of energy it possess when any object or person is in motion . It can be defined as the work needed to be done to produce a motion in a object from rest position.

If we want to acceleration in an object then we must apply a force on a object to give  motion so we can say that we required to do work for acceleration and then we can say that required is equal to kinetic energy.

Mathematically

Kinetic energy =1/2mv^2

Where

m = mass of object.

v = velocity of object

Kinetic energy is vector quantity it means that it have both i.e magnitude and vector.

S.I unit of Kinetic energy is Joule.

Therefore, Shorter people have a lower center of gravity. Taller people have a higher center of gravity. A lot of skateboarding tricks depend on the center of gravity.

Learn more about kinetic energy here:

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Answer:

[tex]250 \times \frac{1}{63.5} \times \frac{2}{1} = 7.874mol \: ag[/tex]

Answer:

a solid in a gas

Explaination:

because soild will take a long while to dissolve into liquid by heating the soild with gas it will disslove quicker

Answer:

the first element on the table is Hydrogen

Answer:

c

Explanation:

I am not sure but this is the answer I can provide now

Answer:

Cold air will push up the warm air, resulting in heavy rainfall in the region.

Answer:

I agree with Omar because it depends on what the charge of the object and magnet is. If the magnet is negative and the object is positive, they will pull together. If the magnet is negative and the object is negative then they will pull apart.

Explanation:

Answer: The correct answer is 5.00 moles

Explanation:

Answer:

heat is the movement from areas of high temperature to areas of low temperature

Answer:

7

Explanation:

There are seven major levels of classification: Kingdom, Phylum, Class, Order, Family, Genus, and Species.

So, the answer is option A.

Answer:

Molecules from food and molecules of oxygen move from the mouth and the nose to cells of the body through a series of blood vessels, including veins, arteries, and microscopically small blood vessels (capillaries), that extend throughout the body.

Explanation: This is right

Answer:

4.255 J/ K

Explanation:

Given data :

mass of Gallium = 16 gm

molar mass = 69.723 g/mol

hence no of moles = 16 / 69.723 = 0.23 moles --------- ( 1 )

Δh ( heat fusion ) = 5.59 KJ/mol

Temperature = 29.8°C = 302.8 k

Determine the entropy change of gallium

Δs ( entropy change ) =  heat fusion / temperature

     = ( 5.59 * 1000) J/mol / 302.8 = 18.46 J/k*mol

Hence entropy change of gallium

= Δs * no of Gallium moles

= 18.46 * 0.23 = 4.255 J/ K

Answer:

2.54 molMJ-1

Explanation:

The formation of CO2 is according to the equation;

C(s) + O2(g) -------> CO2

ΔHreaction = ΔHCO2 - [ΔHO2 + ΔHC]

ΔHO2 and ΔHC = 0 KJ

ΔHCO2 = -393.5 KJ

Hence;

ΔHreaction = -393.5 KJ - 0 KJ

ΔHreaction = -393.5 KJ

1 mol of CO2 yields -393.5 KJ/mol

The negative sign only means that heat was evolved in the process.

nCO2 = 1 mol CO2/393.5 KJ * 1 * 10^3 KJ/1MJ

nCO2 = 2.54 molMJ-1

Answer: 1. Complete Nuclear Symbol : [tex]_{22}^{48}{Ti^{4+}}[/tex]

2. Atomic number : 22

3. Mass number : 48  

4. Charge : 4 +

Explanation:

Atomic number is equal to the number of protons.

Mass number is the sum of number of neelectrons. utrons and number of protons.

Given : no of protons = 22 , thus atomic number = 22

Mass number =  number of neutrons + number of protons

Mass number =  26 + 22 = 48

Also for a neutral atom , the number of protons is equal to the number of electrons. But here electrons are 4 less than protons, which means the atom has lost 4 electrons and thus will have a charge of 4+.

The atomic number is specific to an element, and the element with atomic number 22 is Titanium (Ti). The representation is [tex]_{22}^{48}{Ti^{4+}}[/tex]

Answer:

4.65 moles

Explanation:

To calculate this, we can use Avogradro's Number: 6.022*10^23

[tex]2.8*10^2^4*\frac{1mole}{6.022*10^2^3} =4.65mol[/tex]

So, there are 4.65 moles in 2.8*10^24 atoms of Ti

Answer:

2.77×2= 5.4 mol Ag can be obtained

Answer:

chemistry wow

Explanation:

Answer:

mook passes between the earth and sun