CHEMISTRY HIGH SCHOOL

What happens during chemical reactions?

Answers

Answer 1

Answer:

Answer:

Energy is given off or absorbed.

Explanation:

A P E X

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Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HF 3. HCl 4. HI

Answers

You can compare the strength of the hydrogen bonding by comparing the electronegativities of the other elements. All the four elements, Br, F, Cl and I belong to the same group in the periodic table: group 17 named halogens. Then the kind of bonding they form is similar: polar covalent. You must know the trend of the electronegativities in the periodic table. Electronegativity decrease when you down across a group. Then the electronegativity of F is the higher of the group (indeed, it is the highest of all the 118 elements) . The higher the electronegativity the stronger the attraction that the halogen attracts the electrons and the stronger the hydorgen bonding. Then, the conclusion is that HF has the strongest hydrogen bonding.

The correct answer is HF

For every Pb+2 ion that is formed, how many Cl- ions are formed? (Refer to the reaction in the lesson above.) answer choices
1
3
2
4

Answers

2 is the right choice
hope it helps

Answer:

2 Works on OW 2021

Explanation:

What are energy sublevels? (A)multiple energy levels of any magnitude within an energy level
(B)multiple orbitals of specific magnitude within an energy level
(C)only those energy levels that overlap others
(D)electrons whose energy has dropped to a lower state

Answers

Answer:

Option B

Explanation:

First, we need to know what is an energy level.

An energy level corresponds to the row of the periodic table of element. So, if you see the attached picture, you can see that we have 7 rows where the elements are distributed, so, we have 7 energy levels for all those elements.

Knowing that, the sub levels are the caps where the electrons of the atoms are carried. These sublevels or caps, are called orbitals, these can be of several types

s orbytal: can hold 2 electrons

p orbytal: can hold up to 6 electrons.

d orbytal: can hold up to 10 electrons

f orbytal: can hold up to 14 electrons

g orbytal: can hold up to 18 electrons.

Depending on the row (or energy level) and the atom, we can know how many electrons can carry an element, in which period or row is, and the sub levels. For example, the Chlorine, with an atomic number of 17, can carry up to 7 electrons in it's outer level and it's on the third row (two energy levels). This can be known with it's electronic configuration:

[Cl] = 1s^2 2s^2 2p^6 3s^2 3p^5

The last energy level is 3, so it's the third period, and the electrons of those sub level are 2 and 5, 7 electrons.

Hope this can help better

The answer is B: multiple orbitals of specific magnitude within an energy level

Need help with this equation! Can anybody lay out an answer please?Use this equation; 4Fe + 3O2 -> 2Fe2O3.
If 96.0 grams of oxygen react, what mass of iron was oxidized?

A.) 32.0 g
B.) 96.0 g
C.) 167 g
D.) 223 g

Thanks!

Answers

As you can see in the reaction, for each $3O_2$ that reacts, two $Fe_2O_3$ are created.

There are $(96.0)/(16)=6mol$ of oxygens reacting, hence $2*6/3=4$ mols of iron will be oxidized, which represents $24*55.8=\boxed{223g}$

Calculate the molarity (M) of 1.5 L solution of todium nitrate (NaNO3) containing 61.2 g of NaNO3

Answers

Answer:

$\huge\boxed{\sf Molarity = 0.48\ M}$

Explanation:

Given data:

Volume of solution = 1.5 L

Mass of solute = 61.2 g

Molar mass of solute:

= 23 + 14 + (16 × 3)

= 23 + 14 + 48

= 85 g/mol

Required:

Molarity = ?

Formula:

Molarity = no. of moles of solute / volume

Solution:

First, we have to find moles of solute.

We know that,

Moles = mass / molar mass

Moles = 61.2 / 85

Moles = 0.72 moles

Now, finding molarity:

Molarity = 0.72 / 1.5

Molarity = 0.48 M

$\rule[225]{225}{2}$

The molarity of the 1.5 L solution of sodium nitrate containing 61.2 g of NaNO3 is approximately **0.480 M**

To calculate the molarity (M) of a solution, you can use the formula:

$\text{Molarity (M)} = \frac{\text{moles of solute}}{\text{volume of solution (L)}}$

- Volume of solution ($ V $) = 1.5 L

- Mass of sodium nitrate = 61.2 g

- Molar mass of sodium nitrate = 85 g/mol (Na: 23 g/mol, N: 14 g/mol, O: 16 g/mol)

First, calculate the moles of sodium nitrate using its molar mass:

$\text{Moles of } \text{NaNO}_3 = \frac{\text{Mass}}{\text{Molar mass}} = \frac{61.2 \, \text{g}}{85 \, \text{g/mol}} \approx 0.720 \, \text{mol}$

Now, substitute the values into the molarity formula:

$\text{Molarity (M)} = \frac{0.720 \, \text{mol}}{1.5 \, \text{L}} \]Calculate:\[ \text{Molarity (M)} \approx 0.480 \, \text{M}$

So, the molarity of the 1.5 L solution of sodium nitrate containing 61.2 g of NaNO3 is approximately **0.480 M**.

To know more about molarity refer here:
brainly.com/question/31545539#

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Which substance is a binary acid

Answers

It is knownthat acids compounds contains hydrogen and produces hydrogen ion in water. A binaryacid however is an acid that have two elements, one of the element has ahydrogen attached to it. Examples of binary acids are hydrogen fluoride (HF),hydrogen bromide (HBr) and hydrogen sulfide (H2S). In naming a binary acid, ithas two rules; one, as pure compounds and two, as acid solutions. For purecompounds, start with the name ‘hydrogen’ and end the anion name with ‘-ide’. Foracidic compounds, start with ‘hydro-‘, end the anion with ‘-ic’ and add ‘acid’.

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