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2 years ago

What element is represented in this model of the atomic number is 3 This is science

Chemistry

1 answer:

Amanda [17]2 years ago

6 0

Answer:

lithium because it has an atomic number of three(you could have just googled which element has the atomic number 3)

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Suppose that for the same 10.0 ml sample described in q3, the mass of the crucible with precipitate was 17.550 g, and the mass o

marusya05 [52]

The weight of the precipitate was 17.550g - 17.410g = 0.140g. From a 10ml sample, this means the concentration was 0.140g / 10ml, which is equal to 0.014g/ml.

6 0

3 years ago

What is the Law of Octaves?

kicyunya [14]

i believe the answer would be D. When ordered by atomics mass every eighth element has similar properties.

4 0

3 years ago

[H3O+] [OH−] pH Acidic or Basic 3.5×10−3 _____ _____ _____ _____ 3.8×10−7 _____ _____ 1.8×10−9 _____ _____ _____ _____ _____ 7.1

ankoles [38]

Answer:

See explanation below

Explanation:

I'm assuming this is a table you need to complete, so, you are not putting this in order, but I already found it in another place. let's do a little summary of the expressions we need to use in order to complete the chart.

To calculate pH we need the following expression:

pH = -log[H3O+] (1)

From this expression we can solve for [H3O+] in case we need it:

[H3O+] = 10^(-pH) (2)

When we have [OH-] we calculate the pOH and from there, the pH:

pOH = -log[OH-] (3)

and [OH-]:

[OH-] = 10^(-pOH) (4)

Finally to get the pH from pOH:

14 = pH + pOH

pH = 14 - pOH (5)

With these 5 expressions we can complete the chart. In picture 1, you have the actual chart.

To know if it's acidic or basic, that depends on the value of pH.

If pH <7 it's acidic

If pH >7 it's basic

If pH = 7 it's neutral

First case:

[H3O+] = 3.5x10^-3

pH = -log(3.5x10^-3) = 2.46 (acidic)

pOH = 14 - 2.46 = 11.54

[OH-] = 10^(-11.54) = 2.88x10^-12 M

Second case:

pOH = -log(3.8x10^-7) = 6.42

pH = 14 - 6.42 = 7.58 (it's basic)

[H3O+] = 10^(-7.58) = 2.63x10^-8 M

Third case:

pH = -log(1.8x10^-9) = 8.74 (it's basic)

pOH = 14 - 8.74 = 5.26

[OH-] = 10^(-5.26) = 5.5x10^-6 M

Fourth case:

[H3O+] = 10^(-7.15) =7.08x10^-8 M (Basic)

pOH = 14 - 7.15 = 6.85

[OH-] = 10^(-6.85) = 1.41x10^-7 M

Hope this can help you

7 0

3 years ago

A reaction between solid sulphur and oxygen produces sulfur dioxide. What is the percent yield for a reaction if you predicted t

Oduvanchick [21]

Answer:

56.47%

Explanation:

In this question, we are given;

Theoretical yield of sulfur dioxide as 680 g
Actual yield of sulfur dioxide as 384 g

We are required to calculate the percent yield for the reaction;

We need to know how percent yield is calculated;

% yield = (Actual yield ÷ Theoretical yield) × 100%

Therefore;

In this case;

% yield = (384 g ÷ 680 g) × 100%

= 56.47%

Thus, the percent yield for the reaction is 56.47%

3 0

3 years ago

Which of the following statements describe hydrogen bonding between water molecules or describe properties of water that lead to

egoroff_w [7]

Answer:

1) The slightly negative oxygen atom of one water molecule is attracted to the slightly positive hydrogen atom of another water molecule.

3) Water is polar due to its bent structure and an unequal sharing of electrons.

Explanation:

Water is a polar molecule, where there is a separation of electric charges in the same molecule. This uneven division of electrons gives the water molecule a slightly negative charge near its oxygen atom and a slightly positive charge near its hydrogen atoms.

Water molecules attract each other forming hydrogen bonds when an attraction occurs between the positive end of a water molecule and the negative end of another water molecule.

6 0

3 years ago