In what ways is a sodium atom different from a sodium ion? *

Answers

Answer 1

Answer: sodium atom is neutral where sodium ion is a charged specie with a charge of +1. The number of protons and electrons in sodium atom is same 11 where the number of protons in sodium ion (11) is more than number of electrons (10). The size of sodium ion is smaller than sodium atom.

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If a solution is made by mixing 50.0 moles of KOH to 3.4 kilograms of water then what is the solutions molality?
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Which of the following has a positive enthalpy without a temperature change? condensing gas

evaporating a liquid

cooling a solid

cooling a liquid

Answers

A cooling solid because a cooling liquid would turn into a solid

i think the answer is cooling a liquid

Decomposition of potassium chlorate (KClO3) produces potassium chloride (KCl) and pure oxygen (O2). The balanced equation for the reaction is as follows.mc017-1.jpg
What volume of oxygen gas is released at STP if 10.0 g of potassium chlorate is decomposed? (The molar mass of KClO3 is 122.55 g/mol.)

Answers

Molar mass :

KClO₃ = 122.55 g/mol
O₂ = 32 g/mol

2 KClO₃ = 2 KCl + 3 O₂

2 x 122.55 g KClO₃ ----------> 3 x 32 g O₂
10.0 g KClO₃ ------------------> ?

Mass of O₂ = ( 10.0 x 3 x 32 ) / ( 2 x 122.55 )

Mass of O₂ = 960 / 245.1

Mass of O₂ = 3.9167 g

number of moles O₂ => 3.9167 / 32 = 0.1223 moles

1 mol -------------- 22.4 L ( at STP)
0.1223 moles ---- ?

V = 0.1223 x 22.4 / 1

V = 2.739 L

hope this helps!

Your answer is 2.74.

Which of these elements is the most reactive?potassium
calcium
titanium
scandium

Answers

Answer:

Scandium

Explanation:

Calculate the mass of 25,000 molecules of nitrogen gas. (1 mole = 6.02 x 1023 molecules)

Answers

Answer: $116.2* 10^(-26)$ grams

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number $6.023* 10^(23)$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text {Given molecules}}{\text {Avogadros number}}$

$\text{Number of moles}=(25000)/(6.023* 10^(23))=4.15* 10^(-26)moles$

Now 1 mole of $N_2$ gas weighs = 28 grams

$4.15* 10^(-26)moles$ of $N_2$ gas weighs = $(28)/(1)* 4.15* 10^(-26)=116.2* 10^(-26)$ grams

Thus the mass will be $116.2* 10^(-26)$ grams.

Hey there!

Molar mass N2 = 28.01 g/mol

Therefore:

28.01 g N2 -------------- 6.02*10²² molecules N2

( mass N2 ?? ) ----------- 25,000 molecules N2

mass N2 = ( 25,000 * 28.01 ) / ( 6.02*10²³ )

mass N2 = 700250 / 6.02*10²³

mass N2 = 1.163*10⁻¹⁸ g

Hope that helps!

How does bohrs model agree with Thomson model

Answers

Bohr's Model agree with Thompson's model because Bohr concluded that packets of energy are absorbed or emitted by the atoms when an electron changes shell. Thompson's conclusion states that atoms have small, negatively charged particles (referring to Electrons) as part of their internal structure.

Answers:

Bohr's model agrees with Thompson's model as both hold the fact that there are three sub=atomic particles which makes up an atom and there are equal number of protons and electron in a neutral atom

Explanation:

Bohr's model describes an atom as a planetary like shape in which the electrons revolve round the nucleus which is composed of protons and neutrons.

Thompson's model states an atom as a sphere which is composed of electrons surrounded by positively charged ions.

Which of the following has the greatest effect on colligative properties?A. Epsom salt (MgSO4)
B. Calcium chloride (CaCl2)
C. Potassium Iodide (KI)
D. Glucose (C6H12O6)

Answers

Answer:

Option B. Calcium chloride (CaCl₂)

Explanation:

The colligative properties depend on the concentration of particles (molecules or ions) of solute dissolved and not on the identity of the solute.

For your reference the colligative properties are: i) boiling point increase, ii) freezing point depression, iii) vapor pressure lowering, and iv) osmotic pressure.

When the solute is a ionic compound the ionization yields several ions, so for ionic solutes you must predict first the number or ions formed per unit of compound and then predict the effect on the colligative properties: the greater the number of ions per unit of compound the greater the effect on colligative properties.

So, just set the ionization equations for each compound:

MgSO₄ (aq) → Mg²⁺ (aq) + SO₄²⁻ (aq): 2 ions

CaCl₂ (aq) → Ca²⁺ (aq) + 2Cl⁻ (aq) : 3 ions

KI (aq) → K⁺ (aq) + I⁻ (aq): 2 ions

C₆H₁₂O₆ is a molecular compound, not a ionic one, so it remains s 1 molecule.

Then, since calcium chloride, CaCl₂, produces the greater number of ions it is the solute that productes the greatest effect on colligative properties.

Answer:

D. Calcium chloride (CaCl2)

Explanation:

Founder's Education/ Educere Answer

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