CHEMISTRY HIGH SCHOOL

How many atoms are in 36 g of bromine?

Answers

Answer 1
Answer:

Answer:

2.7*10^23

Explanation:

first work out the moles

So do 36g / 80 (80 is bromine's relative Atomic Mass number)

You have 0.45 M

Then, do 0.45 * 6.02*10^23

You get 2.7*10^23, which is your answer

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Calculate the number of moles in a 14.5 gram sample of C4H10.

Answers

Moles= mass divided by molar mass
Molar mass= 12.01(4) + 1.01(10)
                 = 58.14g/mol

Moles=14.5g / 58.14g/mol
         =0.249

Therefore there are approx 0.249 moles in a 14.5g sample of C4H10

What is 1500 in scientific notation

Answers

To form the value of 1500 in scientific notation, it is
1.    By simply moving the period which separates the whole numbers from the decimal numbers between 1 and 5.
2.    Thus, it then becomes 1.5
3.    Next, is you have to count how many moves the period made from its point of origin hence, for this value is 3
4.    Therefore, the scientific notation for the number is 1.5 x 10^3



A substance whose shape can easily change is aa. solid.
b. powder.
c. fluid.
d. metal.

Answers

Answer:

The correct answer is the option:

c. fluid.

Explanation:

Hello!

Let's solve this!

A substance that can change its shape quickly is a fluid. Fluids have the property of adapting to the shape of the container that contains them. So you can easily change shape.

After the explanation, we conclude that the correct answer is the option:

c. fluid.
c. fluid
Fluids, like water for example, can quickly change shape and conform to their surroundings.

The atomic mass of an element is defined as the weighted average mass of that element’sa. naturally occurring isotopes

b. least abundant isotope

c. radioactive isotopes

d. most abundant isotope

Answers

Answer:

I say its A.

But im not EXTREMELY sure

Explanation:

Answer:

A. Naturally ocuring isotopes

Which list includes elements with the most similar chemical properties? 1.Br, Ga, Hg 2. Cr, Pb, Xe 3. O, S, Se 4. N, O, F

Answers

The list which includes elements with the most similar chemical properties is; Choice 3: O, S, Se

First, we must know:

Elements are arranged in 7 Periods and 18 groups in the periodic table.

Additionally, Elements in the same group of the periodic table often have similar chemical characteristics as a result of equal number of Valence electrons.

By considering Choices individually;

For Choice 1: (Br, Ga and Hg)

  • Bromine is a member of Group 17, Gallium is a member of Group 13 and Mercury is a member of Group 12.

  • Bromine is a member of Group 17, Gallium is a member of Group 13 and Mercury is a member of Group 12.All three elements belong to different groups. In essence, they do not show similar chemical properties.

For Choice 2: (Cr, Pb and Xe)

  • The elements belong to different groups of the periodic table and consequently, they do not show similar chemical properties.

For Choice 3: (O, S and Se)

  • Oxygen, Sulfur and Selenium are all members of Group 16(6)

  • Since, all three elements belong to same group. In essence, they will show similar chemical properties.

For choice 4: (N, O and F)

  • The elements belong to different groups of the periodic table and consequently, they do not show similar chemical properties.

Ultimately, the correct answer is Choice 3.

Read more:

brainly.com/question/12001655

Answer: The correct answer is Option 3.

Explanation:

Elements are distributed in 7 Periods and 18 groups in a periodic table.

Elements which belong to same group show similar chemical properties because of the same number of valence electrons.

For the given options:

Option 1: Br, Ga and Hg

Bromine is present in Group 17, Gallium is present in 13 and Mercury is present in Group 12.

As, all the three elements belong to different groups. So, they do not show similar chemical properties.

  • Option 2: Cr, Pb and Xe

Chromium is present in Group 6, Lead is present in Group 14 and Xenon is present in Group 18.

As, all the three elements belong to different groups. So, they do not show similar chemical properties.

  • Option 3: O, S and Se

Oxygen, Sulfur and Selenium are present in Group 16.

As, all the three elements belong to same group. So, they will show similar chemical properties.

  • Option 4: N, O and F

Nitrogen is present in Group 15, Oxygen is present in Group 16 and Fluorine is preset in Group 17.

As, all the three elements belong to different groups. So, they do not show similar chemical properties.

Hence, the correct answer is Option 3.

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.

Learn more about Oxidation State here:

brainly.com/question/35446763

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