One atom of silicon can properly be combined in a compound witha. three atoms of hydrogen.
b. four atoms of calcium.
c. two atoms of oxygen.
d. one atom of chlorine.

Answers

Answer 1

Answer:

One atom of silicon is perfectly combined with the $\boxed{{\text{two atoms of oxygen}}}$ and forms silicon dioxide.

Further explanation:

Law of multiple proportions:

This law states that the molecule is a particle that is made up of two or more element. The elements are always combined in a ratio of fixed whole number.

Silicon has electron configuration $\left[{{\text{Ne}}}\right]3{s^2}3{p^2}$ so it can form 4 covalent bonds with other atoms.

One atom of silicon is combined with hydrogen in 1:4 ratio and form ${\text{Si}}{{\text{H}}_4}$ . This compound is known as silane. Thus silicon is not able to combine with three hydrogen atoms.

One atom of silicon is combined with calcium as calcium silicate $\left({{\text{C}}{{\text{a}}_{\text{2}}}{\text{Si}}{{\text{O}}_{\text{4}}}}\right)$ and Calcium silicon $\left({{\text{Ca}}{{\text{H}}_{\text{4}}}{\text{Si}}}\right)$ . Therefore, silicon would not be able to combine with 4 calcium simultaneously.

One atom of silicon is combined with oxygen in 1:2 ratio and form ${\text{Si}}{{\text{O}}_2}$ . This compound is known as silicon dioxide. Thus silicon can combine with two oxygen atoms.

One atom of silicon is combined with chlorine in 1:4 ratio and form ${\text{SiC}}{{\text{l}}_4}$ . This compound is known as silicon tetrachloride. Thus silicon is not able to combine with one chlorine.

Learn more:

1. Calculate the moles of chlorine in 8 moles of carbon tetrachloride: brainly.com/question/3064603

2. Which law states the direct relationship between volume and absolute temperature at constant pressure? brainly.com/question/1403211

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Mole concept

Keywords: One atom of silicon, properly combined, three atom of calcium, one atom of chlorine and two atom of oxygen.

Answer 2

Answer:

your answer is c. two atoms of oxygen.

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How many joules are needed to warm 45.0 grams of water from 30.0 degrees C to 75.0 degrees C?

Answers

Answer : The amount of heat needed are, 8464.5 J

Explanation :

Formula used :

$q=m* c* (T_(final)-T_(initial))$

where,

q = heat gained = ?

m = mass of water = 45.0 g

c = specific heat of water = $4.18J/g^oC$

$T_(final)$ = final temperature = $75.0^oC$

$T_(initial)$ = initial temperature = $30.0^oC$

Now put all the given values in the above formula, we get:

$q=45.0g* 4.18J/g^oC* (75.0-30.0)^oC$

$q=8464.5J$

Thus, the amount of heat needed are, 8464.5 J

q=m x Cp x ∆T

m is the mass of the water, Cp is the specific heat of water and ∆T is the change in temperature of the water (final-initial temperature). q is the energy involved in the reaction, measured in joules.

q=(45.0) x (4.184 Jg^-1/°C^-1) x (45°C)
q=8472.6 Joules

Highlight the basic points in Lewis and Langmuir theory of electrovalency

Answers

The correct answer for the question that is being presented above is this one: "Electrovalency is characterized with the transferring of one or more electrons from one atom to another together with the formation of ions and as well as the number of positive and negative charges.

The Lewis and Langmuir theory of electrovalency (and as well as Kossel's) is dealing with Ionic bonds.

Lewis: electron-pair sharing, octet rule, Lewis Symbols or StructureLangmuir: introduced term "covalent" bond, and popularized Lewis's ideas

The Lewis-Langmuir electron-pair or covalent bond is referred as the homopolar bond, where the complete transfer of electrons give rise to ionic, or electrovalent bond (1) through attraction of opposite charges.

Ionic bonds result from high electronegativity differences.
a. True
b. False

Answers

Answer: True

Explanation: An ionic bond is formed when an element completely transfers its valence electron to another element.

Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.

The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element.

This bond is formed between a electropositive metal $M^+$ and a electronegative non-metal $X^-$ .

Final answer:

Ionic bonds result from high electronegativity differences. True.

Explanation:

Ionic bonds result from high electronegativity differences. True. An ionic bond is formed when one atom, usually a metal, transfers one or more electrons to another atom, typically a nonmetal, resulting in the formation of ions with opposite charges. Electronegativity is the tendency of an atom to attract a shared pair of electrons in a covalent bond. When there is a high electronegativity difference between two atoms, one atom will strip electrons away from the other, leading to the formation of ionic bonds.

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Which is a substance that is made up of only one type of atom? compound element solution mixture

Answers

Element is a pure substance that is made up of only one type of atom.

An element cannot be broken down by any chemical means. However, nuclear reactions can lead to the generation of new elements.
Examples of elements include: copper, neon and iron.
Currently, there are 115 known elements in nature.

Final answer:

An element is a substance made up of only one type of atom. It is the simplest form of matter and examples include hydrogen, oxygen, gold, and silver.

Explanation:

A substance that is made up of only one type of atom is an element. Elements are the simplest form of matter that cannot be broken down into simpler substances by ordinary chemical means. Examples of elements include hydrogen, oxygen, gold, and silver, each comprising only one type of atom. On the other hand, compounds, mixtures, and solutions can be comprised of more than one type of atom, molecule, or substance.

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how many milliliters of 1.50 m hno3 contain enough nitric acid to dissolve an old copper penny with a mass of 3.94 g?

Answers

Molar mass HNO₃ = 63.0 g/mol

number of moles = 3.94 / 63.0 => 0.0625 moles

Volume = moles / molarity

V = 0.0625 / 1.50

V = 0.04166 L x 1000 = 41.66 mL

hope this helps!

Final answer:

To dissolve a 3.94g copper penny, we would need approximately 331 milliliters of 1.50 M HNO3, taking into consideration the stoichiometry of the copper-nitric acid reaction.

Explanation:

Stoichiometry is required to solve this chemistry problem. The balanced equation for the reaction between copper and nitric acid is: 3Cu(s) + 8HNO3(aq) → 2NO(g) + 3Cu(NO3)2(aq) + 4H2O(l)

From this, we can conclude that every mole of copper reacts with eight moles of nitric acid. The molecular weight of copper is approximately 63.546 g/mole, so the moles of copper in an old penny can be calculated by mass (3.94 g) divided by the molar mass (63.546 g/mol).

This calculation shows that there are approximately 0.062 moles of copper in a penny. Since we determined that eight moles of nitric acid are required to react with one mole of copper, eight times the moles of copper gives the moles of nitric acid required, which is 0.496 moles.

Since molarity (M) = moles/liters, we can find out the volume of 1.50 M HNO3 required by rearranging the formula to be Liters= moles/Molarity. So, 0.496 moles divided by 1.50 M gives roughly 0.331 liters, which can be converted to approximately 331 milliliters.

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What property of an atom determines its general reactivity?

Answers

The Chemical reactivity of metals varies with your eletropositividade, so the more eletropositivo is the most reactive element is metal. The most reactive metals are those that have great tendency to lose electrons and therefore form positive ions with more ease.

hope this helps!

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