Chemistry, 22.08.2019 23:00 myapawesomeox22sq

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

Answers: 2

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Answer from: hurie98

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:

2. Which law states the direct relationship between volume and absolute temperature at constant pressure?

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 from: Quest

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

Answer from: Quest

The answer is b metal denting

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One atom of silicon can properly be combined in a compound with
a. three atoms of hydrogen.

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