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aleksandrvk [35]
3 years ago
13

Question 7 (Essay Worth 5 points)

Chemistry
2 answers:
Leya [2.2K]3 years ago
6 0

Answer:

other person said it!!

Explanation:

Lubov Fominskaja [6]3 years ago
5 0

The periodic table of elements is divided into columns and rows. The vertical columns represent the groups while the horizontal rows represent the periods. A group of elements usually have similar physical and chemical properties. The first column of the periodic table is made up of 7 elements including SODIUM.

1. The name of the element chosen is sodium and its chemical symbol is Na.

2. Sodium is a metal and thus it has metallic properties.

3. Sodium belongs to group one elements whose family name is ALKALI METALS.

4. The neutral atom of sodium is made up of 11 protons, 11 electrons and 12 neutrons.

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Difference between Physical and chemical changes <br> At least six examples for each type of change
Tju [1.3M]
Physical<span> changes involve a new </span>form<span> or shape of matter, 
</span>

Chemical change<span> is any </span>change<span> that results in the formation of new </span>chemical<span> substances.</span>
4 0
3 years ago
Read 2 more answers
What acid and alkali would react to make sodium sulphate
ludmilkaskok [199]

The acid  and alkali  that would react  to make sodium  sulfate is

alkali= sodium  hydroxide  

acid = sulphuric acid


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

Acid react  react with alkali  to form salt  and  water.

For  sodium  sulfate salt to be  formed  a sulfate acid  is required to react  with a  hydroxide  of sodium .

 therefore Sodium hydroxide (alkali)  react with sulphuric acid (an acid)  to form sodium sulfate (salt) and water.


6 0
3 years ago
A 25.00 ml sample of hydrochloric acid solution, hcl, is titrated with 0.0512 m naoh solution. the volume of naoh solution requi
Tresset [83]

A 25.00 ml sample of hydrochloric acid solution, HCl, is titrated with 0.0512 m NaOH solution. the volume of NaOH solution required is 21.68 ml  then the molarity of the HCl solution is 0.044 M .

Calculation ,

Formula used : M_{1} V_{1} =M_{2} V_{2}                            ...( i )

Where M is the molarity or concentration and V is the volume in ml .

concentration of hydrochloric acid solution ( M_{1}    ) = ?

concentration of NaOH ( M_{2} ) = 0.0512 M

volume of hydrochloric acid solution  ( V_{1} ) = 25.00 ml

volume of NaOH ( V_{2} ) =  21.68 ml

Putting the value of concentration , volume of both  in equation ( i ) we get .

M_{1}   × 25.00 ml = 0.0512 × 21.68 ml

M_{1}    = 0.0512 × 21.68 ml / 25.00 ml= 0.044 M

to learn more about hydrochloric acid solution please click here ,

brainly.com/question/24586675

#SPJ4

5 0
1 year ago
Arrange the elements in increasing order of reactivity : iron, gold, zinc, copper​
liq [111]

Answer:

Iron, Copper, Zinc, and Gold

Explanation:

in Table of elements

Iron was no. 26

Copper no. 29

Zinc no. 30

Gold no. 79

8 0
3 years ago
What is the H30* concentration of 0.027 M Ca(OH)2?
Georgia [21]

Answer:

1.9 x 10⁻¹³M

Explanation:

Given 0.027M Ca(OH)₂(aq) => 0.027M Ca⁺²(aq) + 2(0.027M) OH⁻(aq)

2(0.027M) OH⁻(aq) = 0.054M OH⁻(aq).

from [H⁺][OH⁻] = 1 x 10⁻¹⁴ at STP Conditions (0°C, 1Atm)

∴{H⁺] = [H₃O⁺] = (1 x 10⁻¹⁴/0.054)M = 1.85 x 10⁻¹³M or 1.9 x 10⁻¹³at 0°C & 1Atm pressure.

8 0
3 years ago
Read 2 more answers
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