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Answer:

electrons get transfered from metals to non metals in the formation of ionic bond.

metals have the tendency to lose electrons whereas non metals tend to stabilize by gaining electrons.

Answer:

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Explanation:

Hope you have a great day

Answer:

scientists say the country has many home advantages for good research,but it desperately needs more government interest

Answer:

6.8g of solute are needed

Explanation:

Percent by mass, (w/w%) is defined as the mass of solute in 100g of solution. A solution that is 3.4% contains 3.4g of solute in 100g of solution. That means to make 200g of solution are required:

200g solution * (3.4g solute / 100g solution) = 6.8g of solute are needed

Answer:

0.111

Explanation:

Step 1: Calculate the moles corresponding to 23.2 g of ethanol

The molar mass of C₂H₅OH is 46 g/mol.

23.2 g × 1 mol/46 g = 0.504 mol

Step 2: Calculate the moles corresponding to 73.1 g of water

The molar mass of H₂O is 18 g/mol.

73.1 g × 1 mol/18 g = 4.06 mol

Step 3: Calculate the total number of moles

n = nC₂H₅OH + nH₂O = 0.504 mol + 4.06 mol = 4.56 mol

Step 4: Calculate the mole fraction of ethanol

We will use the following expression.

Χ(C₂H₅OH) = nC₂H₅OH / n

Χ(C₂H₅OH) = 0.504 mol / 4.56 mol = 0.111

Answer:

0.015382279644614 mole.

Answer:

yes this is the answer for that quaz

Answer:

During separation of substances with different boiling points, fractional distillation is used.

During separation of substances in an eutectic mixture or azeotropic mixture, steam distillation is used.

Answer:

255mL

Explanation:

(250.0 + 5.00)mL = 255.00mL

255mL

Answer:

The producer is the grass, and energy flows from the mouse to both the snake and the owl.

Explanation:

The producer is usually defined as a "Producers, also known as autotrophs, make their own food.". Thus, the grass is the producer of the food web provided.

The energy also flows from the mouse to the snake and the owl, as the mouse has two arrows that lead away from it, leading both to the snake and the owl.

Hope this helps.

Answer:

I think it will be the answer

2.5 x 10-2 mol

I hope it help you

Similarly, for one gram atomic weight of silicon with atomic weight of 28 grams, one mole of silicon still contains 6.022 × 1023 silicon atoms.Answer:

Explanation:

hope it helps

Answer:

the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.

Explanation:

Hope it helps

[tex]\bf{\underline{\underline{PHOTOSYNTHESIS }} }[/tex]

Explanation:

Lithium

Sodium

group one elements are highly reactive

Answer:

Number of atoms =1.806×10²⁴

Explanation:

You have the number of moles of Carbon tetrachloride which is n=3

And you are looking for number of atoms that are in the sample, which are represented by the letter "N"

The formula that has both number of moles(n) and number of atoms(N) is written as n=N/Na

Na is called the Avogadros number and it is equal to 6.08×10²³, it never changes(it is a constant)

So you will substitute the number of moles and the avogadros number to you formula, and the only unknown will be the number of atoms which you are looking for

NB: N does not represent the number of atoms only. It may also represent the number of particles or molecules...

Answer:

C: Carbon monoxide - Acidic nature

Explanation:

A) Beryllium is not soluble in water but yet it reacts with an acid and a base. Therefore, since it exhibits both basic and acidic nature, we say it is Amphoteric in nature. Thus it is correct

B)potassium super oxide has the formula KO2. It reacts with acid to form salt called potassium chloride. Thus, it is basic in nature.

C) Carbon monoxide does not react with acids or bases. Thus, it doesn't show either an acidic or basic property and we say it is a neutral oxide. This option is incorrect

D) Bismuth oxide is a basic oxide because it displays properties of a base. This options is correct

Answer:

Empirical formula: CO₂

Explanation:

The empirical formula is defined as the simplest ratio of atoms present in a molecule. We must convert the mass of carbon and oxygen to moles as follows:

Carbon -Molar mass: 12.01g/mol-

3.0g * (1mol / 12.01g) = 0.250 moles C

Oxygen -Molar mass: 16g/mol-

8.0g * (1mol / 16g) = 0.50 moles O

The ratio of O:C is:

0.50mol / 0.250mol = 2

That means the empirical formula is:

Answer:

See explanation

Explanation:

Period 3 elements include; Na, Mg, Al, Si, P,S,Cl and Ar

Across the period, the chlorides of the elements change from solid to gas. The chlorides of metals are solid while the chlorides of non metals are gaseous.

Also, the chlorides become more volatile across the period. The formulas of the chlorides change from MCl to MCl2 to MCl3 to MCl4, MCl5 and MCl6 respectively across the period where M is a period 3 element.

The pH of the solutions of chlorides of period 3 elements change from neutral to acidic across the period. The pH of the chlorides of metals are neutral while the chlorides of the nonmetals usually yield acid solutions.

Answer:

162.4g of CO2 are produced

Explanation:

The combustion of ethanol, C2H5OH, occurs as follows:

2C2H5OH + 7O2 → 4CO2 + 6H2O

Where 2 moles of C2H5OH produce 4 moles of CO2.

To solve this question we need to convert the mass of ethanol to moles. Then, the moles of ethanol to moles of CO2 using the balanced reaction and to mass:

Moles C2H5OH -Molar mass: 46.07g/mol-

85.0g * (1mol / 46.07g) = 1.845 moles C2H5OH

Moles CO2:

1.845 moles C2H5OH * (4mol CO2 / 2mol C2H5OH) = 3.69 moles CO2

Mass CO2-Molar mass: 44.01g/mol-:

3.69 moles CO2 * (44.01g/mol) =

Answer: Van't Hoff factor, i is less than expected from the formula of the compound and this decreases the effective concentration of particles.

Explanation:

Strong electrolytes are defined as the solutions which completely dissociate into their ions.

But, most of the strong electrolytes do not dissociate completely (act ideally) but remain partially undissociated into the ions. Thus, giving a lesser number of ions in the solution than expected.

This means that the Van't Hoff factor, i which denotes the number of ions is less than expected.

As fewer ions are released in the solution, the concentration of the solution is expected to decrease.

Hence, van't Hoff factor, i is less than expected from the formula of the compound and this decreases the effective concentration of particles.

Answer:

4,5

Explanation:

-log(H+)=-log(3,2x10^-5)=4,49

The pH of the solution will be 4.49

A solution's acidity or alkalinity is determined by the concentration of hydrogen ions in the solution. Typically, the pH scale ranges from 0 to 14. Acidic aqueous solutions with a pH will be less than 7 at 25°C are acidic, while basic or alkaline aqueous solutions with a pH  will be more than 7 considered basic or alkaline.

The pH formula can be represented as:

pH = -log[[tex]H_{3}O[/tex]]

Calculation of pH is shown as:

It is given that the , [tex][H_{3}O^{+} ][/tex] = 3.2 × [tex]10^{-5} M[/tex].

Now, put the value of given data in pH formula.

pH = -log[3.2 × [tex]10^{-5} M[/tex]]

pH = -log[3.2] -log[[tex]10^{-5} M[/tex]]

pH = -0.5051b+5 log 10     (log 10 = 1)

pH = 4.49

Therefore, the value of pH will be 4.49.

To know more about pH click here.

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Answer:

300 0.24

600 0.46

900 0.70

1200 0.95

1500 1.20

Explanation: correct on behavior gasses tutorial

Answer:

NaOH

Explanation:

the balance equation is HBr +NaOH----> NaBr+ H2O. The salt formed is NaBr, sodium,Bromide

Answer:

False because pH value below 7 are considered acidic.

Answer:

Any solution that has a pH of less than 7 is considered acidic, and anything above a pH of 7 is basic .

Explanation:

Answer:

7.65 moles of silver are produced

Explanation:

Zinc, Zn, reacts with silver nitrate, AgNO3, as follows:

Zn + 2AgNO3 → Zn(NO3)2 + 2Ag

Where 1 mole of Zn reacts with an excess of AgNO3 to produce 2 moles of Ag

To solve this question we must convert the mass of Zn to moles and, using the chemical equation, we can find the moles of Ag as follows:

Moles Zn (Molar mass: 65.38g/mol):

250g Zn * (1mol / 65.38g) = 3.824 moles Zn

Moles Ag:

3.824 moles Zn * (2mol Ag / 1mol Zn) =