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4 years ago

What is special about the kelvin temperature scale

1 answer:

5 0

Kelvin is a temperature scale designed so that zero degrees K is defined as absolute zero (at absolute zero, a hypothetical temperature, all molecular movement stops - all actual temperatures are above absolute zero) and the size of one unit is the same as the size of one degree Celsius.

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Which of the following is NOT an example of kinetic energy?

fiasKO [112]

Answer: A car rolling down a hill

Explanation: because kinetic energy is the force of some being pulled or pushed

4 0

3 years ago

Read 2 more answers

What types of elements form covalent bonds?

spayn [35]

Covalent bonds form when electrons are shared between two nonmetals.

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3 years ago

How many molecules of sodium oxide will be created if 275 grams of sodium reacts with excess oxygen?

DaniilM [7]

Answer:

<em>1.34 × 10²⁴ molecules</em>

Explanation:

To calculate the <em>number of molecules of sodium oxide that will be created if 275 grams of sodium reacts with excess oxygen</em>, use the chemical equation to calculate the number of moles and then multiply by Avogadro's number.

<u>1) Balanced chemical equation (given):</u>

4Na + O₂ → 2Na₂O

<u>2) Mole ratio:</u>

4 mol Na : 2 mol Na₂O

<u>3) Calculate the number of moles in 275 g of Na:</u>

n = mass in grams / molar mass
mass of Na = 275 g
molar mass of Na₂O = 61.9789 g/mol

n = 275 g / 61.9789 g/mol = 4.437 mol of Na

<u>4) Set a proportion to find the number of moles of product (Na₂O):</u>

2 mol Na₂O / 4 mol Na = x / 4.437 mol Na

x = 4.437 / 2 mol Na₂O = 2.2185 mol Na₂O

<u>5) Convert the number of moles to number of molecules:</u>

# molecules = n × 6.022 × 10²³ molecules/mol = 2.2185 mol × 6.022 × 10²³ molecules/mol = 1.34 × 10²⁴ molecules (rounded to 3 significant figures).

6 0

4 years ago

In witch step did a chemical change most likely occur

11Alexandr11 [23.1K]

Answer:

step 2

hope this helps!

please mark as brainiest<3

6 0

3 years ago

Draw structures from the following names, and determine which compounds are optically active:(b) 3-chloro-2,2,5-trimethylhexane

inn [45]

The given compound 3-chloro-2,2,5-trimethylhexane is an optically active compound .

Because this compound does not have plane of symmetry (POS) and center of symmetry (COS) i.e. does not have di-symmetry . And also forms non superimposable mirror image . the compound is optically active .

It has chiral center.

Here the chiral carbon has 4 distinct groups such as : chlorine , hydrogen , 2-methylpropyl , tertbutyl .

<h3>What is di-symmetry?</h3>

Di-symmetry is that which have no center of symmetry and plane of symmetry and alternate axis of symmetry .

<h3>Chiral center :</h3>

Have Sp3 hybridized center (4sigma bond ) .

4 distinct group is attached to the chiral atom. form non -superimposable mirror image .

<h3>What is optical isomerism ?</h3>

Same molecular formula and same structural formula . also have same physical and chemical properties .

They differ in their behavior towards plane polarized light (ppl) .

Learn more about chiral center here:

brainly.com/question/9522537

#SPJ4

7 0

2 years ago