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Norma-Jean [14]
4 years ago
5

We use the periodic table to determine a mineral’s hardness true or false

Chemistry
2 answers:
Ray Of Light [21]4 years ago
6 0
False we use it to determine what type of element it is as well as the atomic mass and number
Bas_tet [7]4 years ago
3 0
False we use it to detirmine the reactivitys and what groups they are in
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This is due at 2:00 am today. I only have a few points. No links please I need a real answer.
GuDViN [60]

Answer:

7.5 g of AlCl3

Explanation:

The given equation is;

NaOH + AlCl3 --> Al(OH)3 + NaCI.

By inspection, it is not balanced because OH and Clare not equal on both sides of the equation.

Thus, let's make them equal by balancing the equation.

Cl has 3 on the left, so we will make it to have 3 on the right. Same thing with OH on the right and we will make it to have 3 on the left. Thus:

3NaOH + AlCl3 --> Al(OH)3 + 3NaCI

We can see that;

NaOH has 3 moles

While AlCl3 has 1 mole

Thus, to find how many grams of AlCl3 will be required to completely react with 2.25g of NaOH ;

2.25g of NaOH × (3 moles NaOH/39.997 g/mol of NaOH) × (1 mole of AlCl3/3 moles of NaOH) × (133.34 g/mol of AlCl3/1 mol AlCl3) = 7.5 g of AlCl3

5 0
3 years ago
Two students are given different samples of a substance and are instructed to determine the properties of the substance.
Hunter-Best [27]

The complete question is given below:

Two students are given different samples of a substance and are instructed to determine the properties of the substance.  

Which statement describes a property that will be the same for both students?

A. color because it is an extensive property

B. mass because it is an extensive property

C. boiling point because it is an intensive property

D. volume because it is an intensive property .

ANSWER

The correct option is C.

The physical properties of substances are divided into two, intensive and extensive properties.

Intensive properties refers to those features of a substance that do not depend on the quantity of the material that is available. Whether the sample available is big or small, the intensive properties remain the same. Examples of intensive properties are:  melting point, boiling point, refractive index, hardness, density color, etc. This question is asking us to look for an intensive property.

Extensive properties refers to those characteristics of a substance that depend on the amount of substance present. Examples of these properties are: mass, volume, size, weight, length, etc.

From the options given, option A is wrong because color is not an extensive property, it is intensive. Option B is wrong because the mass depend on the amount of sample given and the same thing apply to option D.

The correct option is C,  because no matter the quantity of that substance that you have, the boiling point will always remains the same.  

6 0
4 years ago
A sample of helium gas has a pressure of 1.5 atm at 23 C. At what Celsius
Nina [5.8K]

Answer:

180.87 °C

Explanation:

Applying pressure law,

P/T = P'/T'..................... Equation 1

Where P = Initial pressure of helium gas, T = Initial Temperature of helium gas, P' = Final Pressure of helium gas, T' = Final Temperature of helium gas

Make T' the subject of equation 1

T' = P'T/P......................... Equation 2

From the question,

Given: P = 1.5 atm, P' = 2.3 atm, T = 23°C = (23+273)K = 296 K

Substitute these values into equation 2

T' = (2.3×296/1.5)

T' = 680.8/1.5

T' = 453.87 K

T' = 453.87-273

T' = 180.87°C

3 0
3 years ago
The mother of a child has a cleft chin while the father of a child has a smooth chin. The child also has a cleft chin
timurjin [86]
The mother has stronger genetics
5 0
3 years ago
2. The table below shows the atomic numbers of elements of the periodic table represented by letters I to Q The letters are not
Komok [63]

Explanation:

cudhdbsieehe eirbruwnee8ebeuw eodjsuww8

4 0
2 years ago
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