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3 years ago

Which of these is an element?

Chemistry

2 answers:

Drupady [299]3 years ago

8 0

Carbon I hope you are right :3

gulaghasi [49]3 years ago

3 0

Answer;

Carbon

Explanation;

-An element or a chemical element refers to a substance that cannot be broken down by chemical means. Elements are pure substances and consists of one type of atom.

-Each atom of an element has an atomic number, which represents the number of protons in the nucleus of the atom of that element.

-In this case, the only element in the above choices is carbon. Carbon is an element in the periodic table with an atomic number of 6.

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If an atom has 6 valence electrons, how many electrons does it need to gain to achieve a stable electron configuration?

shusha [124]

it would need to gain 2 more for it to achieve a stable configuration

the best way to remember this is the noble gasses all have 8 valence electrons and that they are the most stable elements on the periodic table

4 0

3 years ago

Read 2 more answers

A 50.0 mL graduated cylinder has a mass of 65.1 g. When it is filled with an unknown liquid to the 49.3 mL mark, the cylinder an

Delvig [45]

<u>Answer:</u> The density of liquid is $1.12g/cm^3$

<u>Explanation:</u>

We are given:

Mass of cylinder, $m_1$ = 65.1 g

Mass of liquid and cylinder combined, M = 120.5 g

Mass of liquid, $m_2$ = $(M-m_1)=(120.5-65.1)g=55.4g$

To calculate density of a substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

We are given:

Mass of liquid = 55.4 g

Volume of liquid = 49.3 mL = $49.3 cm^3$ (Conversion factor: $1mL=1cm^3$ )

Putting values in above equation, we get:

$\text{Density of liquid}=\frac{55.4g}{49.3cm^3}\\\\\text{Density of liquid}=1.12g/cm^3$

Hence, the density of liquid is $1.12g/cm^3$

3 0

3 years ago

4AI+30 2 > 2AI2O3 What id the chemical reaction?

vesna_86 [32]

This is a combination reaction. Look at the 2 elements on left and a compound on the right.

7 0

3 years ago

0.17 M KCHO2 Find the pH

SashulF [63]

I believe the pH is 7. If you would like me to explain comment.

6 0

3 years ago

Consider dissolving sugar in water and magnesium sulfate in water. is any new substance being produced? what happens after sodiu

Olenka [21]

Answer:

Here's what I get

Explanation:

1. Sugar

(a) Dissolving in water

The white solid dissolves in water to give a colourless solution. There is no evidence that a new substance is being produced.

(b) Addition of sodium hydroxide

Adding the colourless solution of sodium hydroxide to the colourless sugar solution gives a colourless solution. There is no evidence that a new substance is being produced.

2. Magnesium sulfate

(a) Dissolving in water

The colourless crystals dissolve in water to give a colourless solution. There is no evidence that a new substance is being produced.

(b) Addition of sodium hydroxide

Adding the colourless solution of sodium hydroxide to the colourless solution of magnesium sulfate gives a white precipitate (see image). This is evidence that a new substance is being produced.

8 0

3 years ago