What occurs when NaCl(s) is added to water?(1) The boiling point of the solution increases, and the freezing pointof the solution decreases.(2) The boiling point of the solution increases, and the freezing pointof the solution increases.(3) The boiling point of the solution decreases, and the freezing pointof the solution decreases.(4) The boiling point of the solution decreases, and the freezing pointof the solution increases.

Answers

Answer 1

Answer: The answer is (1) Boiling point increases and freezing point decreases. This is a colligative property of solutions. When you add a solvent to a solution, the effect is twofold: boiling point elevation and freezing point depression. In effect, you broaden the range of temperatures over which the solution remains liquid. This is why you might see people putting antifreeze in their cars during the summer. While antifreeze does depress the freezing point of the engine oil, it also raises its boiling point, so it doesn't boil as easily during the summer when the engine may become especially hot.

Answer 2

Answer:

The vapour pressure of the solution is decreased by sodium chloride. With a drop in vapour pressure, the boiling point rises. When sodium chloride is added to boiling water, the resultant solution's boiling point rises relative to that of pure water. Here the correct option is 1.

NaCl solution is created when NaCl is added to water. The solution exerts less vapour pressure than pure water because there are comparatively fewer water molecules at the liquid's surface. A decrease in the freezing point of water is seen as a result of this drop in vapour pressure.

When you add a solvent to a solution, the effect is two-fold: boiling point elevation and freezing point depression. The Boiling point increases and the freezing point decreases. This is a colligative property of solutions.

Thus the correct option is 1.

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What is the oxidation state of nitrogen in NaNO2?
(1) +1 (3) +3
(2) +2 (4) +4

Answers

The answer is (3) +3. The Na ion usually has oxidation state of +1. The O ion usually has oxidation state of -2. And the total of oxidation state needs to be zero. Then we can calculate the oxidation state of nitrogen.

Final answer:

The oxidation state of nitrogen in NaNO2 is +3. This figure is calculated by balancing the charges in the molecule to zero, with sodium assigned +1 and oxygen assigned -2 as their oxidation states.

Explanation:

The oxidation state of an element in a compound refers to the hypothetical charge that an atom would have if all bonds to atoms of different elements were 100% ionic. For NaNO2, the sodium (Na) has an oxidation state of +1, and the oxygen (O) has an oxidation state of -2 each. The molecule is neutral, with charge of zero. Thus, if we let x represent the oxidation state of nitrogen (N), we set up the equation:

+1 + x + 2(-2) = 0

Solving for x gives us:

x = +1 - 2*(-2) = +3.

So, the oxidation state of nitrogen in NaNO2 is +3.

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What is an ionic bond

Answers

Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

Answer:

Ionic bond is formed by the cations and anions and their attractive forces.

What is the maximum mass of glucose (C6H12O6) that can be burned in 10 g of oxygen?

Answers

$C_6H_(12)O_6 + 6 \ O_2 \to 6 \ CO_2 + 6 \ H_2O$
1 mole of glucose : 6 moles of oxygen

First calculate the number of moles of oxygen in 10 g:
$M=32 \ (g)/(mol) \nm=10 \ g \nn=(10 \ g)/(32 \ (g)/(mol))=0.3125 \ mol$

1 mole of glucose reacts with 6 moles of oxygen
x moles of glucose reacts with 0.3125 moles of oxygen
$x=(1 \ mol \cdot 0.3125 \ mol)/(6 \ mol) = (3125)/(60000) \ mol= (5)/(96) \ mol$

Now calculate the mass of 5/96 moles of glucose.
$M=180 \ (g)/(mol) \nn=(5)/(96) \ mol \nm=180 \ (g)/(mol) \cdot (5)/(96) \ mol=(900)/(96) \ g=9.375 \ g$

The maximum mass of glucose that can be burned in 10 g of oxygen is 9.375 g.

A physical change is a change

Answers

What are your Choices? What kind of change do you think it is?

The ionization energy of an element is a. a measure of its mass
b. the energy required to remove an electron from the element in its gaseous state
c. the energy released by the element in forming an ionic bond
d. the energy released by the element upon receiving an additional electron
e. none of the above

Answers

The ionization energy is energy required to remove an electron from element in it's gaseous state.

What is ionization energy?

Ionization energy is defined as the minimum energy required to remove an electron from its valence shell of an isolated gaseous atom,positive ion or molecule.Ionization energy is positive for neutral atoms from which it can be concluded that ionization is an endothermic process.

Closer are the valence electrons to nucleus ,higher is the ionization energy.It is usually expressed in electron volts or joules.Ionization energy increases from left to right in a period as more energy is required to remove electrons with small atomic size.

Ionization energy decreases down the group as atomic size increases due to which electrons are easily lost from the valence shell.

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The ionization energy or ionization potential is - the energy required to remove an electron from an element in its gaseous state.

How does thermal energy transfer when a room is heated by a furnace? a
Hot air is absorbed by the objects in the room; cold air expands and rises.

b
Hot air is circulated through the room; the hot air rises, and cold air falls.

c
Hot air makes direct physical contact with the objects in the room and rises.

d
Hot air is transmitted by electromagnetic waves; the hot air rises and falls.

Answers

Answer: D is the right answer pls make me brainliest

Explanation:

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