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dangina [55]
3 years ago
6

How many valence electrons do the alkaline earth metals have?

Chemistry
1 answer:
sergeinik [125]3 years ago
6 0
The alkaline earth metals have two valence electrons , hope this helps <3 .
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An element has a half-life of 30 years. if 1.0 mg of this element decays over a period of 90 years, how many mg of this element
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Answer:

144.6

Explanation:

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3 years ago
The point on a magnet Where magnet effect is strongest is called ​
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Pole

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5 0
4 years ago
During a titration, the pH of an analyte solution containing HA(aq) is 3.92 and the ratio of [A–]/[HA] is 0.41. What is the Ka o
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Answer:

Ka=4.71x10^{-4}

Explanation:

Hello there!

In this case, according to the Henderson-Hasselbach equation, it is possible to write:

pH=pKa+log(\frac{[A^-]}{[HA]} )

Next, since we are given the pH and the [A–]/[HA] ratio, we can solve for the pKa as shown below:

pKa=pH-log(\frac{[A^-]}{[HA]} )

Now, we plug in the values to obtain:

pKa=3.92-log(0.41 )\\\\pKa=3.33

Next, Ka is:

Ka=10^{-pKa}=10^{-3.33}\\\\Ka=4.71x10^{-4}

Best regards!

3 0
3 years ago
A reddish layer of rust can form on old iron nails and bikes. In this chemical reaction, iron reacts slowly with oxygen in the a
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Answer:

Iron slowly reacts with oxygen and forms rust. In this case, the reactants are iron and oxygen. The product is rust, or iron oxide. The chemical equation looks like this:

Explanation:

iron + oxygen → iron oxide

5 0
4 years ago
Read 2 more answers
What is the importnace of every reaction opposite reaction
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Answer:

Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. ... Forces always come in pairs - equal and opposite action-reaction force pairs.

Explanation:

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