Which of the following elements is the least electronegative?
A. NA
B. Al
C. Cl
D. Si

Answer:hope it helps

Explanation:

Answer:

Formal charge = valance electron - nonbonding electron - (1/2)bonded electron

For nitrogen atom,

Formal charge = 5 - 2 - (1/2)×6

= 5-2-3

= 0

So, the formal charge on nitrogen atom in HCN is "0".​​​

Explanation:

The formal charge on the N atom of hydrogen cyanide, HCN molecule is 0. Option B is correct.

Formal charge is defined as the individual charge of an atom. It is represented as:

Formal charge = valance electron - nonbonding electron - (1/2)bonded electron

The valence electrons in nitrogen atom is 5, there are 2 non bonding electrons and 6 bonded electrons on N atom in HCN,

Thus, For Hydrogen cyanide molecule, the formal charge on nitrogen atom is calculated as:

Formal charge

= 5 - 2 - (1/2)×6

= 5-2-3

= 0

So, the formal charge on nitrogen atom in HCN is "0".​​​

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Answer:

B. 0.7%

Explanation:

Given data:

Actual boiling point = 82.5°C

Experimental boiling point = 83.1°C

Percent error = ?

Solution:

Formula:

Percent error = ( actual value - experimental value / actual value )×100

by putting values,

Percent error = (82.5°C - 83.1 °C /82.5°C) × 100

Percent error = 0.007 × 100

Percent error = 0.7 %

Negative sign shows that experimental value is greater than accepted value. It can not written in result.

Answer:

Mass = 23.36 g

Explanation:

Given data:

Number of particles of CO₂ = 3.20 ×10²³

Mass of  CO₂ = ?

Solution:

1 mole contain 6.022×`10²³ particles,

3.20 ×10²³ particles  × 1 mol / 6.022×`10²³ particles

0.531 mol

Mass of CO₂:

Mass = number of moles × molar mass

Molar mass = 44 g/mol

Mass =  0.531 mol× 44 g/mol

Mass = 23.36 g

Explanation:

The two ways that energy can be transferred are by doing work and by heat transfer.

Answer:

The mass of an atom is equal to the protons plus the neutrons

C) volume

Explanation:

hope it helps !

Answer:

Volume. "How much the box can hold" means how much matter can fit into the box

Answer:

Percent composition tells you which types of atoms (elements) are present in a molecule and their levels. Percent composition can also tell you about the different elements present in an ionic compound as well.ion:

Answer:

Explanation:hey

Answer:

200 m

Explanation:

Given data:

Speed of larry = 2 m/s

Time taken = 100 s

Distance travelled = ?

Solution:

Formula:

d = st

d = distance

s = speed

t = time

by putting values,

d = 2 m/s× 100 s

d = 200 m

I am going to put them in order

R r

R RR rR

r rR rr

Answer: V₂ = 37.71mL

Explanation: To determine the new volume of Helium gas, use the Combined Gas Law, which states the following relationship among pressure, volume and temperature:

[tex]\frac{P_{1}V_{1}}{T_{1}} =\frac{P_{2}V_{2}}{T_{2}}[/tex]

where index 1 relates to the initial state of the gas and index 2 to the final state of the gas.

Temperature is in Kelvin, so:

T = °C + 273

For this situation, standard pressure is 1 atm. Temperatures will be:

T₁ = 20 + 273 = 293 K

T₂ = 91 + 273 = 364 K

Solving:

[tex]V_{2}=\frac{T_{2}P_{1}V_{1}}{P_{2}T_{1}}[/tex]

[tex]V_{2}=\frac{364*1*85}{2.8*293}[/tex]

[tex]V_{2}=\frac{30940}{820.4}[/tex]

[tex]V_{2}=[/tex] 37.71

The new volume of He gas is 37.71 mL.

Answer:

B. Opposite

Explanation:

When one electron is transferred from sodium to chlorine, a pair of ions with oppositely charged ions is formed.

The electrostatic attraction between the ions forms a covalent bond between them.

Answer:

the energy used to heat Cu is 27.6 Cal

Explanation:

given data

mass m = 5 g

Specific heat capacity of Cu =  0.092 cal/g

temperature T2 = 80 Celsius

temperature T1 = 20 Celsius

solution

we get here energy used to heat Cu that is express as

Q = m × c × ΔT         ....................1

so here m = mass and c = specific heat capacity

and ΔT = T2 - T1

so put value in eq 1

Q = 5 × 0.092 × (80 - 20)

Q = 27.6 Cal

so that the energy used to heat Cu is 27.6 Cal

Answer: (F) chemical energy

Explanation:

Answer:

Percent composition of O is 48g80g×100%=60%

Answer:

A= producers have the greatest amount of available energy

Answer:

c ) 8

Explanation:

Given data:

Number of moles of water produced = ?

Moles of hydrogen react = 8 mol

Solution:

Chemical equation:

2H₂ + O₂     →     2H₂O

Now we will compare the moles of hydrogen and water.

         H₂          :         H₂O

          2          :            2

         8           :           8

Thus, 8 moles of water will produced.

Answer:

loss of mass

Explanation:

your welcome :)

Answer:

The possible valances can be determined by electron configuration and electron negativity

Good Luck even though this was asked 2 weeks ago

Explanation:

All atoms strive for stability. The optima electron configuration is the electron configuration of the VIII A family or inert gases.

Look at the electron configuration of the nonmetal and how many more electrons the nonmetal needs to achieve the stable electron configuration of the inert gases. Non metals tend to be negative in nature and gain electrons. ( They are oxidizing agents)

For example Florine atomic number 9 needs one more electron to reach a valance number of 8 electrons to equal Neon atomic number 10. Hence Flowrine has a valance of -1

Oxygen atomic number 8 needs two more electrons to reach a valance number of 8 electrons to equal Neon atomic number 10. Hence Oxygen has a valance charge of -2.

Non metals with a low electron negativity will lose electrons when reacting with another non metal that has a higher electron negativity. When the non metal forms an ion it is necessary to look at the electron structure to determine how many electrons the element can lose to gain stability.

For example Chlorine which is normally -1 like Florine when it combines with oxygen can be +1, +3, + 5 or +7. It can lose its one unpaired electron, or combinations of the unpaired electron and sets of the three pairs of electrons.

Answer:

No experiment is a failure, because anytime you mess up, you learn from your mistakes and when you try the experiment again you can fix what you messed up on last time.

Answer:

920mL of water

Explanation:

To solve this question we need to find as first the mass that must be added of water to make 1000mL of syrup using specific gravity. Thus, we can know the volume of water that mus be added:

1.31 is 1.31g/mL. In 1000mL = 1310g/1000mL. As the mass added of sucrose is 850g, the mass of water = Volume of water is:

1310g - 850g = 460g of water = 460mL to make 1L, To make 2L the amount of water that must be added is:

460mL * 2  =

The number of milliliters of water are used to prepare two liters of syrup is 920 mL of water.

Given that,

Based on the above information, the calculation is as follows:

1.31 is = 1.31g/mL.

Now

In 1000mL = [tex]1310g \div 1000mL[/tex].

Now if the mass is added so the mass of water should be equivalent to the volume of the water.

= 1310g - 850g

= 460g of water

Now

= 460mL for 1L,

To make 2L the water should be  

= 460mL (2)

= 920mL of water

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Answer:

0.38 mol

Explanation:

Given data:

Number of formula units = 2.3×10²³

Number of moles = ?

Solution:

According to Avogadro number ,

1 mole contain 6.022×10²³ formula units.

2.3×10²³ formula units × 1 mol / 6.022×10²³ formula units

0.38 mol

Thus, 2.3×10²³ formula units of NaCl contain 0.38 moles of NaCl.

Answer:

one material is probably a conductor of heat, which means it absorbs it much better and faster while the other material isn't a conductor and it's taking time to heat up

Answer:

I give u three in explanation

Explanation:

Crushing the can, stomping on the can, and squishing the can

Answer:

See explanation

Explanation:

A word equation tries to depict a chemical reaction in words. Letters rather than only chemical formulas are used to show the reaction equation.

Now we want to write a word equation that shows the reaction of sodium hydroxide solution and aluminium sulphate solution:

Alumunium sulphate + sodium hydroxide ------>Aluminium hydroxide + sodium sulphate

Answer:

Explanation:

Rutherford gold experiment gave the explanation to some observations made on atoms.

When he shot the gold foil, most of the [tex]\alpha[/tex]-particles passes through the foil undeflected nor absorbed. This faction of the particles propagated the foil as if there was nothing placed on their path.

The surprising behavior of a few of the [tex]\alpha[/tex]-particles was that they were deflected from their initial path on hitting the gold foil.

This implies that there is a part of the gold foil which has the same charge as the [tex]\alpha[/tex]-particles, and more massive than the particles. Thus, he was able to determine the nucleus of an atom.

Answer:

b bitter

Explanation: can i have brainlist please

Answer:

the answer would be B

Explanation:

The move vigorously it is the higher the reactivity so if you put it in order the answer would be B

Answer:

Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution. A concentrated solution of sodium oxide in water will have pH 14. ... For example, it reacts with dilute hydrochloric acid to produce sodium chloride solution.