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2 years ago

Do pure substances have the same chemical and physical properties

1 answer:

4 0

No, some impurities may alter the observed effects of a chemical reaction.. during a reaction other products may be produced, they may alter the MP or BP of the pure substance.

You might be interested in

Which type of hybridization is observed when central atom is located at the centre of regular tetrahedron

Ann [662]

Answer:

sp3 hybridization

Explanation:

Hybridization means the mixing of atomic orbitals to yield hybrid orbitals with characteristics that are different from that of the isolated atomic orbitals before the combination.

sp3 hybridization occurs when one s orbital is mixed with three p orbitals to yield four sp3 hybrid orbitals which can be used to bond to a central atom.

The central atom is then located at the center of a regular tetrahedron at a bond angle of 109°.

3 0

2 years ago

Amino acids are the building blocks of proteins. The simplest amino acid is glycine . Draw a Lewis structure for glycine. (Hint:

madam [21]

Answer:

Sorry for the lack of precision, if you have any questions you can consult me again.

Explanation:

Glycine is an amino acid, forms proteins and is also called in its molecular chemical formula as C2H5NO2

5 0

2 years ago

One of the chair conformers of cis-1,3-dimethylcyclohexane is 5.4 kcal/mol less stable than the other. How much steric strain do

Karolina [17]

Answer:

See explanation

Explanation:

the Cis structure, we can have two possibilities. The methyl groups can go both in axial positions or both in equatorial positions. We have to remember that cis it means "same orientation", so in the axial positions, both methyl groups go up. (Both have the same orientation). In the equatorial positions, both groups go down.

In the axial positions, we will have more steric hindrance because the groups are close to each other. Therefore, we will have more energy and the structure will be less stable. In the equatorial positions, we dont have any steric hindrances, so we will have less energy and more stability.

See figure 1

I hope it helps!

7 0

3 years ago

according to the law of conservation of energy, when a lawn mower uses 750 J of chemical energy from gasoline, how much of this

statuscvo [17]

Conservation of energy
all of it should be transformed since the energy is convserved (neither destroyed nor created)
so answer is B

7 0

3 years ago

You go fishing and obtain some less weights for your trip. Lead’s density is 11.34 g/mL. If there are 50 weights in a 250 mL box

jekas [21]

Answer:

Mass of each weight = 56.7 gram per piece

Explanation:

Given:

Lead’s density = 11.34 g/mL

Number of weights = 50

Volume of box = 250 mL

Find:

Mass of each weight

Computation:

Mass = volume x density

Mass = 250 x 11.34

Mass = 2,835 gram

Mass of each weight = Total Mass / Number of weights

Mass of each weight = 2,835 / 50

Mass of each weight = 56.7 gram per piece

6 0

2 years ago