I need help plz help me

Answer:

Neutral carbon-14 contains six protons, eight neutrons, and six electrons; its mass number is 14 (six protons plus eight neutrons). These two alternate forms of carbon are isotopes.

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Answer:

2 and 5

Explanation:

Answer:

-371 degrees f

Explanation:

-371 degrees F.

speeds on Uranus range from 90 to 360 mph and the planet's average temperature is a frigid -353 degrees F. The coldest temperature found in Uranus' lower atmosphere so far is -371 degrees F., which rivals Neptune's frigid temperatures.

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Answer:

I believe it would be C or B

Answer:

going down the periodic table atomic size increases,electronegativity and ionization decreases going down

Answer:

Queso es yummy. If you give me below 5 stars u like sucking on rocks.

Explanation:

Answer:

0.77018342688495

Explanation:

I did this

Answer:

the solid is so hard

Explanation:

yan na po sana makatulong po heheheh

Metals such as Gallium and mercury are different from that of other metals like aluminium because they are liquid at room temperature. This is because of valence electrons which are relatively free in these metals.

All the metals except mercury and gallium are solids at room temperature. These metals are liquids because of both the high electrical conductivity and the thermal conductivity which come from the fact that one or more valence electrons is relatively free in these atoms to travel throughout the solid metal. This has been formalized in the Wiedemann-Franz law.

Both Gallium and mercury are unique elements (metals) which occur in the liquid state at near the room temperature. It is important here to note that mercury is essentially a liquid at room temperature while gallium becomes liquid at temperature near to room temperature. They both melt very easily due to the low melting temperature values.

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Answer:

About 36%

Explanation:

Answer: B, breaking bonds of the reactant.

Explanation:

This reaction is taking in energy and we know this because it says it 'becomes warm'.

Endothermic reactions take in heat/energy from the surroundings and bond breaking occurs during an endothermic reaction.

B. breaking bonds of the reactants which emits heat energy.

The test tube in which the reaction occur is warm because the heat energy is released due to the making of new bonds. When the new bonds are formed, energy is released in the form of heat.

Energy is needed to break bonds so it absorbed the bonds so we can say that bond-breaking is an endothermic process while on the other hand, energy is released when new bonds form so we can say that bond-making is an exothermic process.

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Answer:

C. Feeling the heat from holding the cup

Explanation:

Conduction is the process by which heat or electricity is directly transmitted through a substance to another substance that has different levels of heat or electricity.

Therefore, the only logical answer is C. Feeling heat from holding the cup.

This is because the heat from the cup is being directly transmitted to the hand of the person.

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- Kay :)

Answer:

The volume of solution in liters required to make a 0.250 M solution from 3.52 moles of solute is 14.08 liters of solution

Explanation:

The question relates to the definition of the concentration of a solution which is the number of moles per liter (1 liter = 1 dm³) of solution

Therefore we have;

The concentration of the intended solution = 0.250 M

Therefore, the number of moles per liter of the required resolution = 0.250 moles

Therefore, the concentration of the required solution = 0.250 moles/liter

The volume in liters of the required solution that will have 3.52 moles of the solute is given as follows;

The required volume of solution = The number of moles of the solute/(The concentration of the solution)

∴ The required volume of solution = 3.52 moles/(0.250 moles/liter) = 14.08 liters

The required volume of solution to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.

Therefore the number of liters required to make a 0.250 M solution from 3.52 moles of solute = 14.08 liters.

Answer:

MgCl2 (s) + Li2CO3 (s) ==> MgCO3 (s) + 2LiCl (aq)

Double Replacement

Explanation:

MgCl2 (s) + Li2CO3 (s) ==> MgCO3 (s) + 2LiCl (aq)

Double Replacement

Halogens are Soluble

Carbonates are Insoluble

This reaction DOES take place.

Answer:

3) Some fibres are called synthetic because they are not made from natural fibres. Instead, they are made by chemical processing of petrochemicals. The synthetic fibres are made up of very large units called polymers. Some of the synthetic fibres are - nylon, rayon, acrylon

4) is used for making parachutes, rock climbing ropes, fishing nets, seat belts. A nylon thread is actually stronger than steel wire.

5) for the following reasons:

1. Plastic containers do not react with food

2. Plastic containers are light weight so they are easy to handle.

3. The price of plastic containers is very less as compared to other containers.

4. They have strong strength.

5.. Plastic containers are durable

6) (thermosetting plastic)  have primary bonds between molecular chains and held together by strong cross-links

(Thermoplastics)  have secondary bonds between molecular chains

Answer:

Question 2: Because the elements could be unstable, forming elemental compounds.

Question 1: Water is made up of Hydrogen and oxygen, which is namely called H2^o What makes it a pure substance is the little mass and molecules it's made up of.

Answer:23.976

Explanation:830j = 197.6 cal. 197.6/100g=1.976 degrees. plus 22 degrees =23.976

Answer:

false

Explanation:

This is not a chemical reaction.

Answer:

In order to find the molecular formula from an empirical formula you must find the ratio of their molecular masses.

We know that the molecular mass of the molecule is 70

gmol-1

. We can calculate the molar mass of

CH2

from the periodic table:

C=12.01

gmol−1

H=1.01

gmol−1

CH2 =14.03

gmol−1

Hence we can find the ratio:

14.03

70

≈

0.2

Answer:

Ammonia doesn't contain any hydroxide ions to begin, but it's dissolved in water acquires hydrogen ion from the water to produce hydroxide as well as ammonium ions. However ammonia doesn't fully convert into hydroxide and ammonium ions in solution that's why ammonia is a weak base.

Answer: The arrangement of electrons in atoms is responsible for the shape of the periodic table.

Explanation: Electron configurations can be predicted by the position of an atom on the periodic table.

                  O_O                               O_O                              O_O

                                        Add me as a freind!!! <3

The periodic table has the shape it has because the elements are arranged according to their atomic number, which is the number of protons in the nucleus of an atom.

The chemical elements are arranged in a periodic table in ascending order of atomic number, allowing one to observe trends in the elements' properties.

Here are some of the reasons why the periodic table has the shape it has:

The periodic table is a valuable tool for understanding the chemical properties of the elements.

Therefore, above mentioned are some of the reasons why periodic table has the shape it has.

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Answer:

It will be : (in simple terms)

Condensation of hot steam or hot vapor on the cooler skin releases the water's latent heat of vaporization, rapidly raising the temperature of the skin which will result in steam burns.

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All the best!!

Answer: [tex]F(g)+e^-\rightarrow F^-(g)[/tex]

Explanation:

Electron gain enthalpy is defined as energy released on addition of electron to an isolated gaseous atom.  

The amount of energy released will be maximum when the tendency to attract electrons is maximum. As flourine has atomic number of 9 and has electronic configuration of 2,7. It can readily gain 1 electron to attain stable noble gas configuration and hence liberates maximum energy.

[tex]F(g)+e^-\rightarrow F^-(g)[/tex]

Answer:

bromine,mercury ,caesium,gallium,rubidium and francium

Explanation:

Answer:

Mercury

Bromine

Caesium

Rubidium

Francium

Gallium

These all are liquid elements

Answer:

1. condensation

2. Temperature

3. evaporization

4. kinetic energy

5. sub limation

6. thermal energy

7. deposition

8. vaporization

Answer:

Explanation:

The light is on the right side of the moon from Earth's perspective. The light will never be on the bottom or top. Its either waxing or waning; left or right

Answer:

Explanation:

Kindly answer the way I have written.