PLSSS help with this question ​

Answer:

The answer is true

Explanation:

Answer:

bla bla bla bla hahahhaa jokers

Answer:

false

salt water does the oppsotie

Explanation:

Answer:

pee

Explanation:

ppppppppppppppppppppppppppppppppppppp

Surely, when there is a decrease in temperature accompanying a chemical reaction, this indicates that: energy was absorbed.

The correct answer choice is option d.

In happens that in a chemical reaction which leads to the absorption of energy due to decrease in temperature, this results as a result of the fact that bonds in the reactants of the reaction are broken than it is released

So therefore, we can now deduce and confirm from the explanation given above that it is an endothermic reaction when energy is absorbed by the system.

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Answer:

The heat that was used to melt the 15.0 grams of ice at 0°C is 4,950 Joules

Explanation:

The mass of ice in the beaker = 15.0 grams

The initial temperature of the ice = 0°C

The final temperature of the ice = 0°C

The latent heat of fusion of ice = 330 J/g

The heat required to melt a given mass of ice = The mass of the ice to be melted × The latent heat of fusion of ice

Therefore, the heat, Q, required to melt 15.0 g of ice = 15.0 g × 330 J/g = 4,950 J

The heat that was used to melt the 15.0 grams of ice = 4,950 Joules.

Answer:

put them 205 centimeters apart

Explanation: i just know

Answer:

1 Meter is equal to 100 centimeters

Determine the ratio to use 100cm/1m

Multiply the given value by the ratio: 0.2m * 100cm/1m

Tanya should plant the saplings 20 centimeters apart

Explanation:

The volume of NO₂=6.25 L

Avogadro's stated :

In the same T,P and V, the gas contains the same number of molecules  

So the ratio of gas volume = the ratio of gas moles  

[tex]\tt \dfrac{V_1}{V_2}=\dfrac{n_1}{n_2}[/tex]

the volume of each gas (in a container of volume 10L) :

Total mol=10+10+20=40 mol

[tex]\tt \dfrac{10}{40}\times 10=2.5~L[/tex]

[tex]\tt \dfrac{10}{40}\times 10=2.5~L[/tex]

[tex]\tt \dfrac{20}{40}\times 10=5~L[/tex]

NO₂ (has increased by 25%) :

[tex]\tt 0.25\times 5~L=1.25\\\\new~volume=5+1.25=6.25[/tex]

[tex]\tt \dfrac{10}{20}\times 6.25=3.125[/tex]

[tex]\tt \dfrac{10}{20}\times 6.25=3.125[/tex]

Answer:

C.A list of metals arranged in order of reactivity

The activity series of the metal is the orderly arrangement of the metals based on the reactivities that show the power of one metal to displace another in a reaction. Thus, option C is correct.

A reactivity series is the arrangement of the metals that shows the analytical progression and the decreasing order of the reactivity. The reactivity series is also called the activity series.

The chart depicts the vigorous nature of the metal that allows them to displace another in a displacement reaction. The reactivity is based on the element that loses its electron more easily.

The reactivity series is based on the element's ability to displace the hydrogen from the acidic solutions and hence, makes them more reactive than the others.

Therefore, the activity series depicts the reactivity.

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Answer:

D

Explanation:

Answer:

reduce the heat

Explanation:

the heat should be reduced to prevent the water to reach it's boiling point(70°).

Answer:

Examples of solids that sublime are dry ice (solid carbon dioxide), iodine, arsenic, and naphthalene (the stuff mothballs are made of).

Explanation:

Answer:

YoungBoy Never Broke Again. Explanation: He is the goat

Answer:

what do u need help with

Explanation:

I can help uu

Answer:

their outer electron shell is full

Explanation:

they are named noble because they are non-reactive

The noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.

Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. Electrons are fundamental to many physical processes, including gravity, electromagnetic interactions, weak interactions, electricity, magnetism, chemistry, and thermal conductivity.

Noble gases are defined as any of a class of extremely stable, very slow-reacting rare gases, such as helium, neon, argon, krypton, xenon, and typically radon. In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. They are known as noble gases because of how beautiful they are and how little they generally react with anything. For this reason, they are also referred to as inert gases. The outer shell of the noble gas are completely filled.

Thus, the noble gases include helium, neon, argon, and xenon. The electron configurations have in common is that there outer shell i.e. p orbital is full of electrons.

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Answer:

They have to be decreased to a lower kinetic energy by lowering the temperature

Explanation:

Solute affects the freezing point of a solvent because, When a substance starts to freeze, the molecules slow down due to the decreases in temperature, and the intermolecular forces start to take over. Therefore, they have to be decreased to a lower kinetic energy by lowering the temperature

Answer:

La presión de un gas en un recipiente cerrado es inversamente proporcional al volumen del recipiente, cuando la temperatura es constante.LÑÑ

Explanation:

El volumen es inversamente proporcional a la presión: Si la presión aumenta, el volumen disminuye. Si la presión disminuye, el volumen aumenta.

Answer:

c) disaccharides have more chemical bonds

Explanation:

disaccharides are made from the condensation of two monosaccharides.

This means there are more bonds in disaccharides. More bonds mean greater energy and vice versa .

The answer mass of copper sulphate is

46g

Answer:

Frost action involves the ~weathering~ processes caused by repeated cycles of freezing and thawing.

Explanation:

Answer: Physical weathering is caused by the effects of changing temperature on rocks, causing the rock to break apart. The process is sometimes assisted by water. Freeze-thaw occurs when water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.

Explanation:

Answer:

A

Explanation:

The correct answer would be that the wire is a conductor and the cover is an insulator.

The wire inside an electrical cord is made up of metals and metals are generally considered to be good conductors of heat and electricity. The cover which is made of plastic or rubber, however, are known to be poor conductor of electricity. Hence, the wire are considered to be conductors of electricity while the rubber covers act as insulators to protect users from getting electrocuted.

The correct option is A.

Answer:

No, because oxygen wants two electrons to become stable and lithium will only give up 1 electron.

Answer:

B. Coffee

Explanation:

Coffee, because every portion of the matter is the same, and its components can only be separated chemically.

The matter is present everywhere. The matter can be a pure substance, mixture, etc. Coffee is a pure substance that is characterized by constant composition. Thus, option B is correct.

A pure substance is defined by the elements and molecules that have the same composition and definite properties and characteristics. All elements and molecules are pure substances.

Coffee is a pure substance that by any physical method cannot be separated into its constituents. They have characteristic chemical and physical properties with a definite composition.

Milk is a colloidal mixture and not a pure substance made of more than combinations. Salt-water is a mixture made of various salts dissolved in water. Similarly, carbon dioxide is a compound made of molecules.

Therefore, option B. coffee is a pure substance.

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Answer:

i think it was lll,lV ㄸㄸㅇㅊㅎㅍㅋ

Answer:

Your answer is D

Explanation: Have a nice day or night

(❁´◡`❁)

Answer:

A plant becomes inactive and stops growing!!!

(aka D)

I got it right if you got it right leave a like

Explanation:

Answer:

3.4g

Explanation:

Given parameters:

Mass of ethanol  = 2.911g

Unknown:

Mass of water vapor = ?

Solution:

To solve this problem, let us write the balanced reaction equation first;

             C₂H₅OH  + 3O₂  → 2CO₂  + 3H₂O

Now find the number of moles of ethanol;

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

    Molar mass of ethanol = 2(12) + 5(1) + 16 + 1 = 46g/mol

  Number of moles  = [tex]\frac{2.911}{46}[/tex]   = 0.06mole

  So;

       1 mole of ethanol will produce 3 moles of water vapor

      0.06mole of ethanol will produce 0.06 x 3  = 0.19moles of water vapor

 Mass of water vapor  = number of moles x molar mass

   Molar mass of H₂O  = 2(1) + 16  = 18g/mol

  Mass of water vapor  = 0.19 x 18  = 3.4g

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

So we have

[tex]V_2 = \frac{500000 \times 200}{250000} = \frac{100000000}{250000} = \frac{10000}{25} \\ [/tex]

We have the final answer as

Hope this helps you