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2 years ago

If anyone will do this answer correct I will mark you as Brainliest. Question no. 4 and 5.

Chemistry

2 answers:

sergeinik [125]2 years ago

6 0

<u>Explanation for part 4 :</u>

Compound : It is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

For example : The carbon tetrachloride $(CCl_4)$ is made from atoms of different elements (carbon and chlorine) combined together in a fixed ratio by mass.

The carbon dioxide $(CO_2)$ is made from atoms of different elements (carbon and oxygen) combined together in a fixed ratio by mass.

Element : It is a pure substance which is composed of atoms of similar elements.

For example : The molecule of hydrogen element $(H_2)$ is made from atoms of similar element (hydrogen).

The molecule of nitrogen element $(N_2)$ is made from atoms of similar element (nitrogen).

<u>Explanation for part 5 :</u>

Atom : It is a smallest unit of matter which can not be further divide.

When the atoms have equal number of protons (which is positively charged) and electrons (which is negatively charged) then the atoms are electrically neutral.

When an atom gains or lose one or more electrons then it becomes an ion. The ion can be anion by gaining an electron and can be cation by losing an electron.

Hence, the atoms are electrically neutral when an atom have equal number of protons and electrons.

icang [17]2 years ago

3 0

Ok let's do this, Big brain moment. Hope you ready.

#4. Sulfuric acid (H2SO4) - Molecular Compound

normally are atoms of other atoms from different elements mixed together to make a new compound, in this case we got ( 2 Hydrogen, 1 sulfur, 4 Oxygen)

34. (part 2) Molecule of a element would normally just be the one atom of the one specific element for example Hydrogen again, it has one electron orbiting its center and thats it.

#5. A atom is electrically neutral when it is by its self and has the same number of protons as it does electrons so there is no extra charge existing in the atom

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What is the limiting reactant for the following balanced equation when 9 moles of AlF3 are mixed with 12 miles of O2?

tamaranim1 [39]

<h2>Answer: $AlF_{3}$ </h2>

Explanation:

The chemical equation of the reaction that occurs when $AlF_{3}$ reacts with $O_{2}$ is

$4AlF_{3}+3O_{2}$ → $2Al_{2}O_{3}+6F_{2}$

$4$ moles of $AlF_{3}$ requires $3$ moles of $O_{2}$ .

$1$ mole of $AlF_{3}$ requires $\frac{3}{4}$ moles of $O_{2}$ .

Given that we have $9$ moles of $AlF_{3}$ .

$9$ moles of $AlF_{3}$ requires $\frac{3}{4}\times 9=6.75$ moles of $O_{2}$ .

But we have $12$ moles of $O_{2}$ .

So, $AlF_{3}$ will be consumed first.

So, $AlF_{3}$ is the limiting reagent.

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3 years ago

Define an Arrhenius base and describe properties of bases. Use an example to explain how an Arrhenius base will behave in water.

frozen [14]

An Arrhenius base is a molecule that when dissolved in water will break down to yield an $OH^-$ or hydroxide ion in solution.

<h3>What is Arrhenius base?</h3>

An Arrhenius base is a compound that increases the $OH^-$ ion concentration in aqueous solution.

An Arrhenius base is a substance that, when dissolved in an aqueous solution, increases the concentration of hydroxide, or , $OH^-$ ions in the solution.

Bases Properties

Arrhenius bases that are soluble in water can conduct electricity.

Bases often have a bitter taste and are found in foods less frequently than acids. Many bases, like soaps, are slippery to the touch.

Bases also change the colour of indicators. Red litmus turns blue in the presence of a base (see figure below), while phenolphthalein turns pink.

Some bases react with metals to produce hydrogen gas.

Acids (pH < 7.0) react with bases (pH > 7.0) to produce a salt and water. When equal moles of an acid and a base are combined, the acid is neutralized by the base. The resulting mixture will have a more neutral pH.

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons. In other words, it increases the number of $H^+$ ions in the water. In contrast, an Arrhenius base dissociates in water to form hydroxide ions $OH^-$ .

Example, sodium hydroxide, is added to an aqueous solution. NaOH dissociates into sodium, $Na^+$ , and hydroxide, $OH^-$ ions.

Learn more about the Arrhenius bases here:

https://brainly.in/question/8273595

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2 years ago

The speed of a note created by a flute will increase as the speed of sound increases. When a marching band goes outside on a col

I am Lyosha [343]

Answer:

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3 years ago

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When a 10 mL graduated cylinder is filled to the 10 mL mark, the mass of the water was measured to be 10.085 g at 20ºC. If the d

Tanzania [10]

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3 years ago

__is oxygen less respiration aided by chemical reaction to transfer energy from reactant glucose to the cell

seropon [69]

Answer:

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Thats just a thought though.

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2 years ago