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Fofino [41]
3 years ago
10

How many periods does the modern periodic table have?

Chemistry
1 answer:
dusya [7]3 years ago
8 0
There are 7 periods in the modern periodic table

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Starting with magnesium and oxygen atoms, use Lewis diagrams to show the formation of the
satela [25.4K]

Answer:

The electronic configuration of the magnesium atom shows that it has two unpaired outermost shell electrons while that of oxygen shows that it has six outermost shell electrons with two of them unpaired.

By means of elecron transfer, magnesium atom donates its two electrons to the oxygen atom to now have a charge of +2 while the oxygen then has a charge of -2. This results in an ionic bonding between the two atoms.

Explanation:

The structure is found in the attachment below

4 0
3 years ago
What is not represented by a balanced chemical equation?
KengaRu [80]

Answer:

A balanced chemical equation follows law of conservation of mass. This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This means that total mass on the reactant side is equal to the total mass on the product side.

6 0
3 years ago
Read 2 more answers
A 25 mL sample of 0.100 M HNO3 completely reacts with NaOH according to this equation:
Anastasy [175]
It is a good thing that you already have answered the first question. Now, moving on to the second question, there exist an equation for the neutralization of acid by a base that is shown below,
                                          M₁V₁ = M₂V₂
Now, all the variables in the equation are given except for our unknown which is the V₂. Substituting the known values from the given above,
                                       (0.1 M)(25 mL) = (0.05 M)(V₂)
The value of V₂ from the equation above is 50 mL. Therefore, 50 mL of 0.05 M NaOH solution will be needed to completely react with HNO3. 
6 0
3 years ago
Read 2 more answers
In order to be a chemical reaction matter must be used up or destroyed
mariarad [96]
The atoms are rearranged...
atoms AREN'T created or destroyed
4 0
3 years ago
One gram of glass will rise 20° C when------------calories of heat are applied
astra-53 [7]

Answer:

3.2 Calories

Explanation:

Here we will use a formula

Heat added in calories = Mass of glass x Increase in temperature x specific heat of glass  

As we know that, specific heat is the amount of energy required to raise the temperature of one gram of any substance by 1°C. It has a constant value for every substance and for glass the specific heat  is .16 calories/gm

Incorporating the values of mass (m), temperature(T) and  specific heat (c) in formula.

     calories (small calories) = l.0 g x 20 degrees x .16 calories/gm/°C

                                                      = 3.2 calories


Hope it helps:)

6 0
3 years ago
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