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3 years ago

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In preparation for a blizzard, a city dispatches a crew to spread salt on the street surface of the bridges around town. The sal

t is spread on the streets because it will likely change the freezing point of water from ____ to ____.

1 answer:

Ilia_Sergeevich [38]3 years ago

3 0

0 degrees to -6 or -16 degrees Celsius

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Form a bond: Each electron has a charge of 1–, and each proton has a charge of 1+. You can calculate the charge of an atom by su

Shtirlitz [24]

Explanation:

Bond forming:

Given species:

Na - Sodium Cl - Chlorine

Na has a valence electron

Cl has 7 valence electron

To form a bond of this nature, there must be a transfer of electrons.

Here, the bond is between a metal and non-metal

The metal is sodium and the non-metal is chlorine;

Na → Na⁺ + e⁻ loss of 1 electron

2,8,1 2,8

isoelectronic with Neon

Cl + e → Cl⁻ gain of one electron

isoelectronic with Argon

Na⁺ + Cl⁻ → Na⁺.Cl⁻

This bond type is an ionic bond

5 0

2 years ago

Read 2 more answers

The atomic number is determined only by the number of ________ in the nucleus of an atom. But, in a neutral atom it also represe

sveticcg [70]

Hello!

The atomic number is determined only by the number of protons in the nucleus of an atom. But, in a neutral atom it also represents the number of electrons in the electron cloud.

Neutrons are only important in the nucleus for helping us find atomic weight, which varies as we move along the perodic table and does not always equal the same amount of it's atomic number. Which is why it would not be a suitable answer for the first blank space. Electrons do not work either as they do not exist inside the nucleus but rather outside the atom.

The second space, since it states is in the electron cloud, we can deduct that electrons would be an appropriate answer there.

If you need anymore help feel free to ask, but I hope this answers your question.

5 0

3 years ago

When you have analyzed your data and you form a _____________ ?

MAVERICK [17]

Hypothesis or outline

8 0

3 years ago

what is the inferred pressure, in million of atmospheres, in Earth's interior at a depth of 2900 kilometers?

NemiM [27]

Answer:

1.4 millions atmospheres

Explanation:

8 0

3 years ago

Suppose that 0.1000 mole each of H2and I2are placed in a 1.000-L flask, stoppered, and the mixture is heated to 425oC. At equili

Katen [24]

<u>Answer:</u> The value of equilibrium constant for the given reaction is 56.61

<u>Explanation:</u>

We are given:

Initial moles of iodine gas = 0.100 moles

Initial moles of hydrogen gas = 0.100 moles

Volume of container = 1.00 L

Molarity of the solution is calculated by the equation:

$\text{Molarity of solution}=\frac{\text{Number of moles}}{\text{Volume}}$

$\text{Molarity of iodine gas}=\frac{0.1mol}{1L}=0.1M$

$\text{Molarity of hydrogen gas}=\frac{0.1mol}{1L}=0.1M$

Equilibrium concentration of iodine gas = 0.0210 M

The chemical equation for the reaction of iodine gas and hydrogen gas follows:

$H_2+I_2\rightleftharpoons 2HI$

<u>Initial:</u> 0.1 0.1

<u>At eqllm:</u> 0.1-x 0.1-x 2x

Evaluating the value of 'x'

$\Rightarrow (0.1-x)=0.0210\\\\\Rightarrow x=0.079M$

The expression of $K_c$ for above equation follows:

$K_c=\frac{[HI]^2}{[H_2][I_2]}$

$[HI]_{eq}=2x=(2\times 0.079)=0.158M$

$[H_2]_{eq}=(0.1-x)=(0.1-0.079)=0.0210M$

$[I_2]_{eq}=0.0210M$

Putting values in above expression, we get:

$K_c=\frac{(0.158)^2}{0.0210\times 0.0210}\\\\K_c=56.61$

Hence, the value of equilibrium constant for the given reaction is 56.61

6 0

3 years ago