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Alja [10]
3 years ago
6

Select the true statements.

Chemistry
1 answer:
Natasha2012 [34]3 years ago
8 0

Answer:

A) and D)

Explanation:

A) BF 3 has a trigonal planar shape

TRUE.

BF₃ has three bonding pairs and no lone pairs. According to VSEPR theory, it is an AX₃ molecule with trigonal planar geometry.

B) Molecules with three outer atoms always have a trigonal planar shape.

False

NH₃ has three outer atoms but a trigonal pyramidal shape.  

C) NH₃ has a trigonal planar shape

False.

NH₃ has three bonding pairs and one lone pair. According to VSEPR theory, it is an AX₃E molecule with trigonal bipyramidal geometry.

D) Trigonal planar molecules have three regions of high-electron density around the central atom

TRUE

The regions of high-electron density are the three bonding pairs.

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Would you expect the carbonyl carbon of benzaldehyde to be more or less electrophilic than that of acetaldehyde? Explain using r
Slav-nsk [51]

Answer:

Benzaldehyde is less electrophilic than acetaldehyde

Explanation:

Electrophilicity of carbonyl carbon depends on it's positive charge density.

In benzaldehyde, phenyl group can act as an electron donating group towards carbonyl group due to it's electron donating resonating effect.

In acetaldehyde, methyl group can act as an electron donating group towards carbonyl group due to it's electron donating inductive effect.

We know that resonating effect are more stronger than inductive effect.

Henece, it is expected that positive charge density on carbonyl carbon is much lower in benzaldehyde than acetaldehyde.

So, benzaldehyde is less electrophilic than acetaldehyde.

Resonating effect of phenyl group has been shown below.

4 0
3 years ago
How can high-altitude training help athletes get more oxygen to their cells
mixas84 [53]

Answer:

the altitude in witch the athlete is running candy help them run faster useing less energy

8 0
3 years ago
Ty for anyone helping!
sp2606 [1]
23. Enzyme A, as the temperature increases, the rate of reaction goes down. However, Enzyme B as the temperature goes up the reaction goes up.

24. Enzyme B is more active in a human cell, the reaction is what you want and everytime the temperature goes up in enzyme B the reaction goes up.
6 0
4 years ago
Identify which two compounds below are constitutional isomers
Romashka [77]

Answer:

(CH₃)₃COCH3₃ and (CH₃)₂CHOCH₂CH₃

Explanation:

Isomers are compounds which have the same molecular formula. Constitutional isomers have different connectivity; the atoms are connected in different ways.

1. (CH₃)₃COCH₃

2. (CH₃)₂CHOCH3₃

3. (CH₃)₂CHOCH₂CH₃

Molecules 1 and 3 have the same formula (C₅H₁₂O) and are isomers. Molecule 2 is not an isomer. From the structural formula, it is clear that Molecules 1 and 3 have different connectivity.

4 0
3 years ago
an irregularly shaped solid is dropped into a graduated cylinder filled with 45.00 mL of water. the water level with the object
posledela

The density of the object is 1.96 g/cm³.

Mass = 73.5 g

Volume = 82.5 mL – 45.00 mL = 37.5mL = 37.5 cm³

Density = mass/volume = 73.5 g/37.5 cm³ = 1.96 g/cm³

8 0
3 years ago
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