100points and BRAINEST awnser PLEASEEEE HELP


I need help with 2 and three

Answer:

It would take 12 minutes.

Answer:

8 minutes

Explanation:

G(g)                 T(min)

100 --------------- 0

50-------------------2

25 -------------------4

12.5  ---------------  6

6.25 ----------------8

     another    way:

100/6.25 = 16

  16 = 2⁴       ( 4 half lives)    

Each half life is 2 minutes

so 4 half lives will be 8 minutes

I can only tell you that when a atomic level is hig it as more electro around the electron cloud and it means that it is harder to be unstable

Currents are made by wind blowing over the water.

Currents created by wind are formed through the use of warm and cold air. The warm air becomes lighter through expansion, causing it to rise and transform into a warm air current. Cool air is heavier than the warm air, which makes it move to replace the warm air, thus forming a cool air current.

In short, currents are not made by wind blowing over water, but by the characteristics of warm and cool air acting on one another.

Additionally, the rest of the answers can easily be proven true.

Cold currents do cause nearby coastlines to become colder. This is because these winds blow into the coast and affect the temperature. The process also applies to warm air. Warm air can blow into the coastline and warm the area. (With this, both "Cold currents cause nearby coastlines to be colder," and "Warm currents cause nearby coastlines to be warmer," have been shown to be truthful.)

Oceans more more slowly than wind is also correct. The ocean is an uninterrupted surface which winds can peacefully blow across. This lack of disruption causes the winds to move quickly - much faster than even the ocean itself. The ocean('s) currents move slower than the winds. (Therefore, "Oceans move more slowly than wind," had been proven true.)

Oceans hold more heat than atmosphere on land has a simple explanation: the Sun. As we know, this humongous, fiery star we depend on for survival spreads its sunlight all over Earth. The oceans are no exception. The ocean(s) absorb(s) this sunlight and transform(s) it to heat and energy. Since water has a higher capacity for heat compared to air, it can store larger amounts of heat with less of a change in temperature (than air). (For that reason, "Oceans hold more heat than atmosphere on land," is indeed a factual statement.)

All of the options, apart from Currents are made by wind blowing over the water, have been proven true. With that being said, our answer is clear. (Hope this helps - have a lovely week!)

Answer:

currents are made by wind blowing over the water

Explanation:

In which direction does weather typically move? a. from east to west c. from north to south b. from west to east d. from south to north *this is the next question on the test and the answer is FROM WEST TO EAST*

Which of these describe a warm front?

Warm and cool air mass that are not strong enough to move one another

Cold air meets warm air, fast moving and stormy. Severe weather is likely.

Warm air meets cold air. Slow moving with less severe weather.

Ocean surface temperature is greater than 80F.

*these are the third question answers and there are no brainly answers online, so the answer to this one is, WARM AIR MEETS COLD AIR. SLOW MOVING WITH LESS SEVERE WEATHER.*

hope this helps :)

Answer:

6 moles of O2

Explanation:

2KClO3 -> 2KCl + 3O2

How many moles of O2 are produced when 4.0 moles of KCl are produced?

For every 2 moles of KCl 3 moles of O2 are produced

so for 4 moles of KCl, 6 moles of O2 are produced

Answer:

a synthesis reaction occured when the liquids were mixed

Answer:

A nucleophile view the full answer Question 3 (1 point) What is the first step in nucleophilic addition under acidic conditions? Protonation of the nucleophile Addition of the nucleophile Loss of water Protonation of the carbonyl

Explanation:

Answer:

the first step, which is rate-determining, an electrophilic reagent adds to the pi bond. In the second step a nucleophilic reagent adds to the electron deficient intermediate that was formed in the first step.

Explanation:

A part of our body that protect the heart and lungs is known as The rib cage

Answer:

Sodium Phosphide + Fluorite --------- Sodium Fluoride + Calcium Phosphide

Answer:

a Pure substance contains of only one element or 1 compound

Explanation:

Substances such as Nitrogen, water, and oxygen,

are pure substances because they have a secure chemical composition throughout it's molecules. So basically they are substances or compounds with distinct chemical properties and a constant composition.

Hope this helps have a great night/day!

Answer:

2Na + Br2 = 2NaBr

Explanation:

In order to balance a chemical equation you make the make sure both sides have the same number of atoms on each side, you do this by multiplying on both sides as if it was a algebraic equation.

Na+ Br2 = NaBr

Na × 2 = Na2

Na × 2 = Na2

Br × 2 = Br2

2Na + Br2 = 2NaBr

Hope this helps.

Answer:

The element phosporus is located to the right of the element magnesium along the same period in the periodic table. Which best describes the relationship of the elements? Magnesium has a larger atomic number.

Answer:

When NaCl is dissolved in water, it dissociates into Na+ and Cl− . These ions can be attracted strongly to the partial negative end and partial positive end of the water molecule.

Explanation:

Hence, the major intermolecular forces that contribute to the dissolution of NaCl in water are ion-dipole forces.

Answer:

yes he forced up then avoid it

Answer:

A gasss

Explanation:

they have enough kinetic energy that the effect of the intermolecular forces is small and they are spaced very apart from each other

Answer:

The answer is 4778.4 cm (cubed)

Explanation:

V = (πr(squared)) x (h/3)

V = (π x 13(squared)) x (27/3)

V = 530.9291585 x 9

V = 4778.4

Answer:

Explanation:

There are two 250 mL aq solutions. The first solution is potassium chromate and the second is silver nitrate. The masses of the solute in each of the solutions are the same. After the reaction was completed, the precipitate was found to have a mass of 167 g. Calculate the concentration of potassium ions in the original potassium chromate solution.

K2CrO4  + AgNO3-----> Ag2CrO4 + KNO3

Ag2CrO4 HAS A MOLECULAR WEIGHT OF 2(108x2) + 52 + (4X16) =

216 + 52 + 64 =332

167gm/332= 0.51 moles which has 0.51 moles of CrO4 and required

2X0.51 moles K=1.02 moles of K

the original solution was 250 ml or 0.250L and had 1.02 moles/0.250L=

4.1 moles/L of K or 4.1 M of K

Answer:

Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen? The two systems must be the same temperature. The two systems must not be touching each another.

Taking into account the definition of calorimetry, sensible heat and latent heat,  the heat of fusion of water is 335.091 [tex]\frac{J}{g}[/tex] .

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

In this case:

In firts place, you know that the melting point of water is 0°C. So, first of all you must increase the temperature from -25° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).

The amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

Q1= 2.03[tex]\frac{J}{gC}[/tex] × 49.3 g× 25 °C

Solving:

Q1=2501.975 J=2.501975 kJ≅ 2.50 kJ

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing:

Q2= 49.3 g× ΔHfus

Similar to sensible heat previously calculated, you know:

Replacing:

Q3= 4.18[tex]\frac{J}{gC}[/tex] × 49.3 g× 44.7 °C

Solving:

Q3= 9211.5078 J=9.2115078 kJ≅ 9.21 kJ

The total heat required is calculated as:

Total heat required= Q1 + Q2 + Q3

Total heat required= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ

Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. This is, the total heat required is 28.23 kJ. Then:

28.23 kJ= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ

Solving:

28.23 kJ= 11.71 kJ + 49.3 g× ΔHfus

28.23 kJ- 11.71 kJ = 49.3 g× ΔHfus

16.52 kJ = 49.3 g× ΔHfus

16.52 kJ ÷ 49.3 g= ΔHfus

0.335091[tex]\frac{kJ}{g}[/tex]= 335.091 [tex]\frac{J}{g}[/tex] =ΔHfus

In summary, the heat of fusion of water is 335.091 [tex]\frac{J}{g}[/tex] .

Learn more:

Answer: Reactants-Products

Answer:

34 grams of carbon is approx. 2.833 moles

Explanation:

Let's try to understand. Hope this picture can help you:D

Answer:

B

Explanation:

Covalent bonding involves the sharing of electrons between two non-metal elements

Answer:

precipitation reaction.

Explanation:

an insoluble substance is called a precipitate, so the reaction is a precipitation reaction.

Answer:

you need to move one of the dots from Ca to the one at Cl like the arrows show

Explanation:

Considering the ideal gas law, the ratio of the final to the initial number of moles in the container is 4.

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P× V = n× R× T

Then ,the number of moles can be expressed as:

[tex]n=\frac{PxV}{RxT}[/tex]

In this case, a container filled with an ideal gas is connected to a reservoir of the same gas so that the number of moles in the container can change. You want to know the ratio of the final to the initial number of moles in the container, this is, [tex]\frac{n_{final} }{n_{initial} }[/tex].

The number of moles [tex]n_{initial}[/tex] can be expressed as:

[tex]n_{initial} =\frac{P_{initial} xV_{initial} }{RxT_{inital} }[/tex]

and the number of moles [tex]n_{final}[/tex] can be expressed as:

[tex]n_{final} =\frac{P_{final} xV_{final} }{RxT_{final} }[/tex]

Then:

[tex]\frac{n_{final} }{n_{initial} } =\frac{\frac{P_{final} xV_{final} }{RxT_{final} }}{\frac{P_{initial} xV_{initial} }{RxT_{initial} }}[/tex]

Being R is a constant number:

[tex]\frac{n_{final} }{n_{initial} } =\frac{P_{final} xV_{final} }{T_{final} }x\frac{T_{initial} }{P_{initial} xV_{initial} }[/tex]

The pressure and volume of the container are each doubled while the temperature is held constant, then you know:

Replacing in the the ratio of the final to the initial number of moles:

[tex]\frac{n_{final} }{n_{initial} } =\frac{2xP_{initial} x2xV_{initial} }{T_{initial} }x\frac{T_{initial} }{P_{initial} xV_{initial} }[/tex]

[tex]\frac{n_{final} }{n_{initial} } =\frac{4xP_{initial} xV_{initial} }{T_{initial} }x\frac{T_{initial} }{P_{initial} xV_{initial} }[/tex]

[tex]\frac{n_{final} }{n_{initial} } =4}[/tex]

Finally, the ratio of the final to the initial number of moles in the container is 4.

Learn more:

Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid. HoPe iT doSe WhaT EvEr U nEed IT foR hUmAn