CHEMISTRY HIGH SCHOOL

Which pair of atoms can form an ionic bond?* Na, K (Sodium, Potassium)
* K, F (Potassium, Fluorine)
* F, Cl (Fluorine, Chlorine)
* Na, Ne (Sodium, Neon)

Answers

Answer 1
Answer:

Answer: K, F (Potassium, Fluorine)

Explanation: Ionic bonds are formed by transfer of electrons between metal and non metals.

Covalent bonds are formed by sharing of electrons between non metals.

Electronic configuration of potassium:

[K]:19:1s^22s^22p^63s^23p^64s^1

Potassium atom will lose one electron to gain noble gas configuration and form K^+.

[K^(+)]:18:1s^22s^22p^63s^23p^6

Electronic configuration of fluorine:

[F]:9:1s^22s^22p^5

Fluorine atom will gain one electron to gain noble gas configuration and form F^-.

[F^-]:10:1s^22s^22p^6

In potassium fluoride the one electron from potassium metal gets transferred to fluorine atom and thus form an ionic bond to give KF
Answer 2
Answer:

The pair of atoms that can form an ionic bond is \rm K\ , F (Potassium, Fluorine).

An atom is the basic unit of matter that consists of a nucleus, which contains positively charged protons and uncharged neutrons, surrounded by a cloud of negatively charged electrons.

In the given pair of atoms potassium and fluorine can form ionic bonds. This is because potassium has one valence electron, which it can easily lose to form a positively charged ion, while fluorine has seven valence electrons and needs one more electron to complete its outer shell. Therefore, it has a strong tendency to gain one electron to form a negatively charged ion.

  • When potassium and fluorine combine, the potassium atom loses one electron to become a positively charged ion, while the fluorine atom gains one electron to become a negatively charged ion.

The resulting oppositely charged ions are attracted to each other, forming an ionic bond.

In conclusion, \rm K (potassium) and \rm F (fluorine) are the atoms can form ionic bonds.

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Which substance is NOT a compound?a. salt
b. sodium
c. pure water
d. carbon monoxide

Answers

Among the given ones, sodium is not a compound. The correct option is b.

What is a compound?

The substance that is formed by union of different elements is referred to as a compound.

For instance, salt is made up of sodium and chloride, water have hydrogen and oxygen, etc.

Thus, the correct option is b.

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b, sodium because if you look at your periodic table it is the only element not compounded with another 

Calculate the heat energy for this scenario: You are repeating the food experiment we did in class with a different food snack. At the beginning of this experiment, you started with 25 grams of water at 22 deg * C At the end of the experiment, the final temperature of the water is 45°C. The specific heat of water is 4.18J / (deg) * CSub and solve

Answers

Answer:

Mass of water (m) = 25 grams = 0.025 kg (since 1 g = 0.001 kg)

Specific heat of water (c) = 4.18 J/(g°C) = 4.18 J/(kg°C)

Initial temperature (T_ {initial}) = 22°C

Final temperature (T_(final) )= 45°C

Change in temperature (ΔT):

ΔT=T_(final)-T_ {initial}=45°−22°=23°

Now, calculate the heat energy (Q)

Q=mass×specific heat×ΔT

Q=0.025kg×4.18J/(kg°C)×23°C

Q≈2.44kJ

So, the heat energy for this scenario is approximately 2.44 kilojoules (kJ).

Why does sodium form a 1+ ion but magnesium forms a 2+ ion

Answers

because Na has one too many electron to be stable, while Mg has 2. once they loose those electrons, they will be come ion. loosing one electron will give the ion a 1+ charge, and loosing 2 will create a 2+ charge

If the atomic weight of nitrogen is 14.01, what is the mass of the nitrogen atoms in one mole of cadmium nitrate, Cd(NOÀ)¿?

Answers

2x14.01 =28.02 
ans is B

What word is not associated with Exothermic? A)absorbs energy B )burning firewood C )freezing water D) releases energy

Answers

Answer:

C

Explanation:

Answer:

D

Explanation:

Not a because the term exo means outward, so exothermic means releasing energy so D.

Not B or C because they have nothing to do with exothermic (exo- outward thermic- energy)

What happens when Ca(NO3)2 and Na2CO3 combine?

Answers

When the two compounds are allowed to be in contact and reacts the product would be sodium nitrate (NaNO3) and calcium carbonate (CaCO3). This reaction is a double displacement reaction. The balanced equation is :

Ca(NO3)2 + Na2CO3 = 2NaNO3 + CaCO3
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