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arsen [322]
3 years ago
9

20 points to whoever can answer these 3 questions correctly

Chemistry
1 answer:
vazorg [7]3 years ago
5 0

Answer:

1.true

2.2

3. false

Explanation:

.........

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MgO + H2O = Mg(OH)2 is an example of a _____ chemical reaction.
algol [13]

a) synthesis- or combination- reaction

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The size of the chosen symbols on a graph may be used to indicate the:
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Uncertainty of the data  hope its help you

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How much water has to be evacuated from 250ml of 1M Ca(OH)2 to make it 3M​
lorasvet [3.4K]

Answer:

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Explanation:

Answer could not be show due to technical difficulties

6 0
3 years ago
How are elements labeled on the periodic table that have the same number of<br> valence electrons?
aksik [14]

Answer:

Explanation:

Elements that have most similar properties were placed in the same group on the periodic table and this is done based on the number of valence electron each of the element posses which allow them reach in a similar manner as a member of the same family. A group of element is placed on a a vertical column of the periodic table.

For all element with one valence electron they are labelled with 1A on the group, and are usually the first column followed by 2A until group 8.

1A element are known to be very reactive and form compounds with similar properties with other elements.

8 0
3 years ago
What is this balanced?<br> Al2O3---&gt; Al+O2
saveliy_v [14]

The balanced equation :

<em>2Al₂O₃⇒ 4Al+3O₂</em>

<h3>Further explanation</h3>

Given

Reaction

Al₂O₃⇒ Al+O₂

Required

Balanced equation

Solution

A chemical reaction is said to be balanced if the number of elements involved in the reaction is the same (either the reactants or the products)

The reaction above is said to be unbalanced because the number of elements Al and O in the reactants and products is not the same.

The balancing step

1. Give a coefficient

Al₂O₃⇒ aAl+bO₂

2. Make an equation

Al, left = 2, right = a⇒a=2

O, left = 3, right = 2b⇒2b=3⇒b=3/2

The equation becomes :

Al₂O₃⇒ 2Al+3/2O₂ x2

<em>2Al₂O₃⇒ 4Al+3O₂</em>

6 0
3 years ago
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