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Dimas [21]
2 years ago
13

A group of students performed a human demonstration of a chemical reaction. Jack and Emily sat on a bench. Kevin asked Jack to l

eave the bench and sat in his place. Which type of chemical reaction did the students demonstrate? Acid-base reaction Single replacement Double replacement Decomposition reaction
Chemistry
1 answer:
aleksley [76]2 years ago
6 0

Answer:

Single replacement reaction

Explanation:

  • Chemical reactions may be classified as replacement reactions, decomposition reactions, synthesis reactions, neutralization reactions, and precipitation reactions among others.
  • Replacement reactions are types of reactions in which a more reaction ion or element takes the place of the least reactive element in a compound.
  • A Single replacement reaction involves a single element taking the place of the least reactive element in a compound.
  • A double replacement reaction involves an exchange of cations and ions taking the place of each other in the initial compound.
  • In the above analogy, Kevin takes the place of Jack on the bench which shows how a single replacement reaction works.
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Which of the following describes a scenario in which the molecular geometry would have the smallest bond angle(s)? (A) four bond
maw [93]

Answer: The correct answer is "B" two bonding domains(or bonding pairs) or two non bonding domains(or lone pairs)

Explanation:

Molecular geometry/structure is a three dimensional shape of a molecule. It is basically an arrangement of atoms in a molecule.It is determined by the central atom, its surrounding atoms and electron pairs.According to VSEPR theory, there are 5 basic shapes of a molecule: linear, trigonal planar, tetrahedral, trigonal bipyramidal and octahedral.

A)Four bonding domains and zero non bonding domains: shape is tetrahedral and bond angle is 109.5°

B)Two bonding domains and two non bonding domains(lone pairs): shape is bent and bond angle is 104.5°

C)Three bonding domains and one non bonding domain: shape is trigonal pyramidal and bond angle is 107°

D)Two bonding domain and zero non bonding domain: shape is linear and bond angle is 107°

E)Two bonding domain and one non bonding domain: bent shape and bond angle is 120°

F)Three bonding domains and zero nonbonding domain: shape is trigonal planar and bond angle is 120°

Hence Two bonding domains and two non bonding domains have the smallest bond angle.

6 0
2 years ago
A 0.500 g sample of C7H5N2O6 is burned in a calorimeter containing 600. g of water at 20.0∘C. If the heat capacity of the bomb c
Nata [24]

Answer:

22.7

Explanation:

First, find the energy released by the mass of the sample. The heat of combustion is the heat per mole of the fuel:

ΔHC=qrxnn

We can rearrange the equation to solve for qrxn, remembering to convert the mass of sample into moles:

qrxn=ΔHrxn×n=−3374 kJ/mol×(0.500 g×1 mol213.125 g)=−7.916 kJ=−7916 J

The heat released by the reaction must be equal to the sum of the heat absorbed by the water and the calorimeter itself:

qrxn=−(qwater+qbomb)

The heat absorbed by the water can be calculated using the specific heat of water:

qwater=mcΔT

The heat absorbed by the calorimeter can be calculated from the heat capacity of the calorimeter:

qbomb=CΔT

Combine both equations into the first equation and substitute the known values, with ΔT=Tfinal−20.0∘C:

−7916 J=−[(4.184 Jg ∘C)(600. g)(Tfinal–20.0∘C)+(420. J∘C)(Tfinal–20.0∘C)]

Distribute the terms of each multiplication and simplify:

−7916 J=−[(2510.4 J∘C×Tfinal)–(2510.4 J∘C×20.0∘C)+(420. J∘C×Tfinal)–(420. J∘C×20.0∘C)]=−[(2510.4 J∘C×Tfinal)–50208 J+(420. J∘C×Tfinal)–8400 J]

Add the like terms and simplify:

−7916 J=−2930.4 J∘C×Tfinal+58608 J

Finally, solve for Tfinal:

−66524 J=−2930.4 J∘C×Tfinal

Tfinal=22.701∘C

The answer should have three significant figures, so round to 22.7∘C.

8 0
2 years ago
Activity 7: Crossword Puzzle
Ivenika [448]

Answer:

Across

2. Conduction.

3. Plates

4. Convection

5. Subduction

7. Earthquake

Down

1. Radioactive

6. Radiation

8. Sink

9. Slabpull

The clues are;

Across:

2. air molecules come in contact with warmer molecules

3. crust are made up of puzzle - like landmass called_____

4. rising and falling movement of material in the mantle

5. when tectonic plates push with each other

7. it is the result of movement of earth's plate

Down:

1. elements that play a vital role in Earth's internal heat

6. least important mode of heat transport

8. warm material rise; cool material______

9. heats build up underneath the crust

4 0
1 year ago
In which 1.0 gram sample are particles arranged in a rystal structure?
lilavasa [31]
The Options are as follow,

<span>                               (1) CaCl</span>₂<span> (s)     (3) CH</span>₃<span>OH (l)</span>

<span>                               (2) C</span>₂<span>H</span>₆<span> (g)      (4) Cal</span>₂<span> (aq)</span>

Answer:

            Option-1 is the correct answer.

Explanation:

                  As we know crystal formation is the property of solids. Therefore, in given options we are given with four different states of matter. 

                  Option A, CaCl₂ is in a solid state , so it can exist in crystal form.

                  Option 2, C₂H₆ (Ethane) is in gas form, so it cannot form crystals.

                  Option 3, CH₃OH (Methanol) is present in liquid form, so it fails to form crystals.

                  Option 4, CaI₂, it is dissolved in water, Hence, it is in aqueous state, Therefore it also lacks crystal structure.

5 0
2 years ago
Explain why you hear a “whoosh” sound when you open a can containing a carbonated drink. Which gas law applies?
Lana71 [14]

Carbonated drinks have the air under pressure so that carbon bubbles are forced into the drink, keeping it carbonated. So when you open a can, the air under pressure in the can comes out of the can at a high speed, making a "whooshing" sound. The gas law that applies to this concept is the Boyle's Law (PV=k or P1V1=P2V2).

6 0
2 years ago
Read 2 more answers
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