I NEED HELP QUICK PLEASE PLEASE HELP 100 POINTS

Explanation:

Selective breeding involves choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics.

Answer:

C and D

Explanation:

IF CORRECT PLEASE GIVE ME BRAINLLEST!!!!!!!!!!

IF NOT PLEASE TELL ME, AND IF YOU KNOW, WHY!!!!!!

THANKS!!!!!!!!!!!

◑﹏◐:-)O_o(○’ω’○)∩﹏∩↖(^ω^)↗o_O(ToT)^O^囧rzB-)

Answer:

The above answer is right C and D

Explanation:

its not A becuase half the earht is dark at night

its bot b because the poles are cold and light is not directly shning on them

it IS c because the light is on and close to the equator and not the pole.

it IS D because a pole is a high altitude that gets less sunlight

Answer:

DECREASES THIS IS OBVIOUS

Explanation:

The [OH−] of a solution : 0.0052 M

Kb is the base ionization constant  

LOH (aq) ---> L⁺ (aq) + OH⁻ (aq)  

[tex]\rm Kb=\dfrac{[L][OH^-]}{[LOH]}[/tex]

Dissociation of weak base of CO₃²⁻ :

Reaction

CO₃²⁻ + H₂O⇒ HCO₃⁻ + OH⁻

use ICE method :

I : 0.15               0             0

C : x                   x             x

E : 0.15-x            x            x

[tex]\tt Kb=\dfrac{[HCO_3^-][OH^-]}{[CO_3^{2-}]}\\\\1.8\times 10^{-4}=\dfrac{x^2}{0.15-x\approx 0.15}\\\\x^2=1.8\times 10^{-4}\times 0.15\\\\x=0.0052[/tex]

Answer: When converting from Scientific Notation to a standard or normal notation, use the value of the exponent to determine the number of places to move the decimal point. Move the decimal place to the right if the exponent is positive and move the decimal place to the left if the exponent is negative.

Explanation: I got this from a website but I still hope it helps!

Answer: if i were to convert a Scientific notation and it was 5.1³ then i would move the decimal point 3 times making it 5100 but if it were some thing like 5.123² you'd move the decimal 2 pts. making 512.3

Answer:

4.15 M

Explanation:

In order to find the molarity of a stock solution of Z, we use the formula;

Co = 10pd/M

where;

p = percentage by mass of Z

d = density of Z

M= molar mass of Z

Substituting values;

Co= 10 * 35 * 1.4/118

C0= 4.15 M

Answer: Mixture

Explanation:

Element is a pure substance which is composed of atoms of similar elements.

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air which conatins a mixture of [tex]N_2[/tex], [tex]O_2[/tex] , [tex]Ar[/tex] and [tex]CO_2[/tex]

Answer: it ISNT occurs in substances that have discrete molecular structure

Explanation:

I took the test

The characteristics that can be written only in space B is they occur in substances that have at least one non-metal. The correct option is A.

Ionic bonds are formed when two electrically charged elements shred their charged ions.  Covalent bonds are formed when there is a mutual sharing of electrons between the atoms.

One condition that is similar in both is both bonds needed one non-metal to form the bond.

Thus, the correct option is A, which occurs in substances that have at least one non-metal.

Learn more about the ionic and covalent bonds, here:

https://brainly.com/question/12663276

#SPJ2

Answer:

concentration?

Explanation:

solute  = The dissolved substance in a solution.

solvent  = The liquid in which the solute dissolves to form a solution.

Answer:

the only marked thing was in new game for the quiz that link yes to be in a relationship

Explanation:

you followed a 1 or a 1 year of high.

Answer:

1.5 g

Explanation:

Step 1: Given data

Step 2: Calculate the required moles (n) of NaCl

We will use the following expression.

n = C × V

n = 0.10 mol/L × 0.25000 L

n = 0.025 mol

Step 3: Calculate the mass (m) corresponding to 0.025 moles of NaCl

We will use the following expression.

m = n × M

m = 0.025 mol ×58.44 g/mol

m = 1.5 g

Answer:

B. 7 protons, 10 electrons

Explanation:

hope this helps :)

Answer:

Changing states of matter occur when matter loses or absorbs energy. When a substance absorbs energy the atoms and molecules move more rapidly and this increased kinetic energy pushes particles far enough, that they change form. This energy is usually heat or thermal energy.

Explanation:

B)

FeO = 56, 16, 0

FeCO3 = 56, 48, 12

Fe2O3 = 112, 48, 0

Fe3O4 = 168, 64, 0

Answer:

acid and rain

Explanation:

acid rain

Answer:

acid rain is checimal reaction to sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain. Bascalliy it's because of sulfur dioxide and nitrogen

Explanation:

Answer:

1st box:4

2nd box:2

3rd box:3

4th box:1

Explanation:

I am not 100% sure on this, but i am pretty confident that this is the answer! BUT If this is somehow wrong, please tell me so i can comment a better answer! :)

Due to property of conduction, conductor allows electrons and electric current to move easily,insulators prevent electric current from moving, electric current is the  flow of an electrical charge in a circuit and electric circuit provides a path for electrons to flow​.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

Learn more about conduction,here:

https://brainly.com/question/12136944

#SPJ5

Answer:

pH = 2.87

Explanation:

When NaOH reacts with HF NaF and H2O are produced:

NaOH + HF → NaF + H2O

That means after the reaction moles of NaF are equal to moles of NaOH added and moles of HF are initial moles of HF - moles of NaOH added:

Moles NaOH = Moles NaF:

0.050L * (0.20mol/L) = 0.01 moles of NaF

Moles HF:

0.050L * (0.60mol/L) = 0.03 moles HF = Initial moles

0.03 moles - 0.01 moles = 0.02 moles HF

To find pH we need to use H-H equation to determine pH of the buffer:

pH = pKa + log [NaF] / [HF]

Where pH is pH of the buffer

pKa is pKa of HF-NaF buffer: 3.17

And [] could be taken as moles of each species.

That is:

pH = 3.17 + log [0.01] / [0.02]

Answer:

b

Explanation:

Answer: I think its (B) Humans mine more oil and coal to produce energy.

Explanation: Hope this helps!

Answer:

NCl₃ + 2 H₂O = HNO₂ + 3 HCl

Explanation:

Let's consider the unbalanced equation showing the reaction between nitrogen trichloride and water to form nitrous acid and hydrochloric acid.

NCl₃ + H₂O = HNO₂ + HCl

We start balancing Cl atoms by multiplying HCl by 3.

NCl₃ + H₂O = HNO₂ + 3 HCl

Then, we balance O atoms by multiplying H₂O by 2.

NCl₃ + 2 H₂O = HNO₂ + 3 HCl

The equation is now balanced.

Answer:

They have the same number of valence electrons (5) so the body assumes they are the same element.

Answer:

a. 3.79e5 J

b. Decrease.

Explanation:

Hello!

a. In this case, since the heat involved during a compression-expansion isothermal process is computed via:

[tex]Q=nRTln(\frac{V_2}{V_1} )[/tex]

Now, since the final volume is one third of the initial one:

[tex]V_2=\frac{V_1}{3}[/tex]

So we can plug in now:

[tex]Q=139mol*8.3145\frac{J}{mol*K}*298.15K*ln(\frac{\frac{V_1}{3} }{V_1} )\\\\Q=-3.79x10^5J[/tex]

b. In this case, the relationship between initial and final volume is:

[tex]V_2=2.2V_1[/tex]

So the heat interaction is now:

[tex]Q=139mol*8.3145\frac{J}{mol*K}*298.15K*ln(\frac{2.2V_1 }{V_1} )\\\\Q=2.72x10^5J[/tex]

It means that the heat interaction decrease on the contrary process, it means that in a. heat was released by 3.79e5 J and in b heat is absorbed by 2.72e5 J.

Best regards!

Answer:

i think its b but i could be wrong

Explanation:

Answer: the answer is B it remains constant

Explanation:

The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.

Answer: the answer would be A

Explanation:

Answer:

A

Explanation:

Answer:

c. N, P, and As can sometimes share more than 8 e-

Explanation:

Lewis structures are diagrams that show the valence electrons of atoms within a molecule. Valence electrons play a major role while drawing Lewis structures as only valence electrons can be shared with another molecule to form a bond.

N, P, and As can not share more than 8 e- because they have less valence electrons in their outer shell. N has only one valence electron, P and As has only 5 valence electrons so they can not share more than their valence electrons.

Hence, the correct answer is "c. N, P, and As can sometimes share more than 8 e-".

Answer:

the emission or transmission of energy in the form of waves or particles through space or through a material medium.

Answer:

Perrous magnets

Explanation:

Answer:

The volume of NaOH used

Explanation:

The tip of the buret is part of its calibration. If this tip is not filled before taking the initial reading, the volume of NaOH used at the end of the titration would be inaccurate.

In order to avoid this, the valve of the buret should be opened and the NaOH allowed to displace whatever air that might have been trapped at the tip before the initial buret reading is taken and the titration is carried out.