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2 years ago

8

Atoms of which two elements have a combined total of 23 protons?

1 answer:

Alik [6]2 years ago

6 0

Answer:

A

Explanation:

Sodium has 11 electrons and Magnesium has 12 electrons. Since here you need to consider atoms, they must have equal amount of protons as electrons to be considered neutral, and so an atom.

So simply 11+12 =23

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Which of the following molecules has a bent shape?

Yuri [45]

The answer is C good luck

4 0

2 years ago

How many moles are in 2.98x10^23 particles?

Novosadov [1.4K]

Answer:

$\boxed {\boxed {\sf 0.495 \ mol}}$

Explanation:

We are given a number of particles and asked to convert to moles.

<h3>1. Convert Particles to Moles </h3>

1 mole of any substance contains the same number of particles (atoms, molecules, formula units) : 6.022 *10²³ or Avogadro's Number. For this question, the particles are not specified.

So, we know that 1 mole of this substance contains 6.022 *10²³ particles. Let's set up a ratio.

$\frac { 1 \ mol }{6.022*10^{23 } \ particles}}$

We are converting 2.98*10²³ particles to moles, so we multiply the ratio by that value.

$2.98*10^{23} \ particles *\frac { 1 \ mol }{6.022*10^{23 } \ particles}}$

The units of particles cancel.

$2.98*10^{23} *\frac { 1 \ mol }{6.022*10^{23 } }}$

$\frac { 2.98*10^{23}}{6.022*10^{23 } }} \ mol$

$0.4948522086 \ mol$

<h3>2. Round</h3>

The original measurement of particles (2.98*10²³) has 3 significant figures, so our answer must have the same.

For the number we found, 3 sig figs is the thousandth place.

The 8 in the ten-thousandth place (0.4948522086) tells us to round the 4 up to a 5 in the thousandth place.

$0.495 \ mol$

2.98*10²³ particles are equal to approximately <u>0.495 moles.</u>

3 0

2 years ago

The "particles" of gases are actually atoms, or molecules. truefalse

kirill [66]

They are atoms. a molecule is made up of atoms.

8 0

3 years ago

exis [7]

Answer: False

Explanation: adding heat to matter results in thermal energy.

4 0

3 years ago

Other questions:

vlabodo [156]

Answer:

The functional group present in Cinnamon are : Aromatic , alkene , aldehyde

The functional group present in Almonds : Aromatic , aldehyde

The functional group present in DHA : Ketone , alcohol

Explanation:

<u>Almond :</u>

Chemical formula : $C_{7}H_{6}O$

It contain : A benzene ring (Aromatic) , a -CHO group (aldehyde)

<u>Cinnamon Sticks</u> :

Chemical Formula : $C_{9}H_{8}O$

It contain : A benzene ring (Aromatic) ,an alkene group (C=C) , a -CHO group (aldehyde)

<u> </u><u>DHA:</u>

Chemical Formula : $C_{3}H_{6}O_{3}$

It contain : Alcohol group (-OH) , ketone group (C=O)

8 0

2 years ago