Which subatomic particle has a negative charge?

1.Explain why the reactivity of group 7 decreases as you move down the group. Try to use the sentence starters here: When group

Kruka [31]

Answer: The reactivity of group 7 decreases as we move down the group because:

Explanation:

The elements of group 7 that is fluorine to iodine. The halogens are non metals and they react with metals to gain electrons. The metals loose electrons and the non metal gains it.

As we move down the group the atomic radius gets bigger( more electron and more proton) and as a result the outer shells move further away from the nucleus.

There is more distance between the negatively charged electrons and positively charged nucleus.

Therefore the force of attraction between the shells and nucleus is lesser or weaker.

This makes attracting an extra electron from metals very difficult which results in weaker reaction.

Consequently, the reactivity decreases as we move down the group 7

5 0

2 years ago

What purpose did the chemical water serve at the time

elena-14-01-66 [18.8K]

Answer:

At What time?

Explanation:

6 0

3 years ago

What does h20 mean on the periodic elements chart

Paladinen [302]

Answer:

The compound, H₂O, will not be found on the periodic table. This is because the periodic table only consists of individual elements. That being said, the elements found within H₂O are located on the periodic table. H₂O consists of hydrogen, denoted by the symbol "H", and oxygen, denoted by the symbol "O". The subscript (the 2) tells us that there are 2 hydrogen atoms located in the H₂O molecule.

Hydrogen is the first element listed on the periodic table and can be found in the top leftmost position. Oxygen is the eighth element on the periodic able and is located in the second row at the top right.

3 0

1 year ago

HELP<br> How can you tell if mass is being conserved

Murljashka [212]

I can help say like gas is steaming from a pot like you cooking on the gas is being conserved after it evaporates and liquid if you drink water it’s going into your body so it’s being conserved and solid said like i have a brick and you throw it and it breaks it had been conserved because it’s broken

8 0

2 years ago

GO FAST / WILL MARK BRAINLIEST / WILL GIVE THANKS / WILL GIVE 5 STARS

Nikitich [7]

<h2>question 1</h2>

Mg + 2HCl→ MgCl2 + H2

after balancing the coefficient for H2 is 1

<em><u>explanation </u></em>

since 1 is in front of H2 it is the coefficient for H2

question 2

the reaction is single replacement

<u><em>explanation</em></u>

because single replacement occurs when one element replaces another.
for the reaction of Mg + 2HCl→MgCl2 +H2 Chlorine

<h2> Question 3</h2>

The coefficient of H2 is 3

<em><u>explanation</u></em>

from the balanced chemical reaction
that is N2 +3H2 →2NH3 the coefficient in front of H2 is 3

<h2 /><h2> question 4</h2>

N2 + 3H2 → 2NH3 is a synthesis reaction

<u><em>explanation; </em></u>

Synthesis reaction occurs when two or more reactants combine to form a single product.

N2 reacted with H2 to form NH3 (ammonia) hence it is an example of synthesis reaction.

<h2>question 5</h2>

The sign that shows that a chemical reaction has occurred is color change, change in temperature and formation of a gas (bubble)

color change change in temperature, formation of precipitate and formation of a gas(bubble) is always an indicator of an occurrence of a chemical change.

<h2>Question 6</h2>

H2S is not a strong acid

<u><em>explanation</em></u>

strong acid undergo a complete electrolysis when dissociate in water for example HNO3
weak acid undergo a partial electrolysis when dissociate in water for example H2S

<h2>question 7</h2>

feels slippery is not a property of an acid

<u><em>explanation</em></u>

feel slippery is an example of a base
The properties of an acid are

sour taste
changes the color of an indicator
usually react with metal among others

<h2> Question 8</h2>

detergent with a PH of about 10 is a <u><em>basic</em></u>

<em><u>explanation</u></em>

Base has a Ph which range from 7.1 to 14
since the detergent has a PH of 10 is a basic

<h2>Question 9</h2>

The balanced chemical equation for the synthesis of NaBr is

2Na + Br2 →2 NaBr

<u><em>explanation</em></u>

This is because the equation obey the law of mas conversation

for example it has 2 atoms of Na in both reactant and product side

<h2>Question 10</h2>

reacts with metals is not a common property of a base

<u><em>Explanation</em></u>

base has

bitter taste,
feels slippery
turn red litmus paper blue among others

<h2> question 11</h2>

Hydrochloric acid have a PH in 0-6 range

<u><em>explanation</em></u>

HCl is a strong acid

acid has a PH which are below PH of 7 hence HCl has a PH which range from 0-6

<h2>Question 12</h2>

A brand shampoo which has a PH between 5 -6 is a weak acid

generally acid has a PH below 7
weak acid has a PH of between 5 -6 therefore brand shampoo is a weak acid

<h2>question 13</h2>

The PH that indicate a solution of a base is a PH of 12

<em><u>Explanation</u></em>

base has a PH which range between 7-14, hence a PH of 12 indicate that it is a Base

7 0

2 years ago