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3 years ago

What is the octet rule? What is it based on?

1 answer:

8 0

Answer: The octet rule is a chemical rule of thumb that reflects the observation that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

Explanation:

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If a wave is traveling at a steady speed and its frequency is

Nataly [62]

Answer:

If the frequency is doubled, the wavelength is only half as long.

Explanation:

Wave speed equals frequency*wavelength. So doubling the frequency must halve the wavelength in order for wave speed to remain the same.

4 0

3 years ago

Which tool can be used to measure the volume of a liquid to one decimal place?

pentagon [3]

The tool to measure the liquid is a measuring cylinder.

3 0

3 years ago

Read 2 more answers

Write a balanced half-reaction for the reduction of dichromate ion to chromium ion in acidic aqueous solution. Be sure to add ph

Serhud [2]

Answer:

The balanced half-reaction for the reduction of dichromate ion to chromium ion in acidic aqueous solution:

$Cr_2O_7^{2-}(aq)+14H^+(aq)+6e^-\rightarrow 2Cr^{3+}(aq)+7H_2O(l)$

Explanation:

The reaction :

$Cr_2O_7^{2-}\rightarrow Cr^{3+}$

Balancing of reaction in an acidic medium:

Step 1: Balance the atoms in the reaction:

$Cr_2O_7^{2-}(aq)\rightarrow 2Cr^{3+}(aq)$

Step 2: Balance oxygen atom by adding water on the side where no oxygen or less oxygen atom is present;

$Cr_2O_7^{2-}(aq)\rightarrow 2Cr^{3+}(aq)+7H_2O(l)$

Step 3: Balance the hydrogen atom by adding hydrogen ions on the side where water is absent:

$Cr_2O_7^{2-}(aq)+14H^+(aq)\rightarrow 2Cr^{3+}(aq)+7H_2O(l)$

Step 4: Now balance charge by adding electrons on the side where more positive charge is present

$Cr_2O_7^{2-}(aq)+14H^+(aq)+6e^-\rightarrow 2Cr^{3+}(aq)+7H_2O(l)$

The balanced half-reaction for the reduction of dichromate ion to chromium ion in acidic aqueous solution:

$Cr_2O_7^{2-}(aq)+14H^+(aq)+6e^-\rightarrow 2Cr^{3+}(aq)+7H_2O(l)$

6 0

3 years ago

Need help guys!!!!

Serhud [2]

A. When two chemicals mix their temperature rise: Exothermic
b. A solid burns brightly and releases heat, light and sound: Exothermic
c. When two chemicals are mixed their temperature drops: Endothermic
d. Two chemicals will only react if you heat them continually: Endothermic
e. Plants take in light energy for photosynthesis: Endothermic

I hope this helps :)

4 0

3 years ago

How many moles are in 153’pp grams of KClO3

katen-ka-za [31]

Answer:

n = 1.24 moles

Explanation:

Given that,

Mass = 153 grams

Molar mass of KClO₃ = 122.55 g/mol

We need to find the number of moles.

We know that,

No. of moles = given mass/molar mass

So,

$n=\dfrac{153}{122.55 }\\\\n=1.24$

So, there are 1.24 moles in 153 g of KClO₃.

4 0

3 years ago