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3 years ago

A national database has been established in order to help identify the source of what plants?

Chemistry

2 answers:

Nostrana [21]3 years ago

8 0

Answer:

poisonous

Explanation:

Naily [24]3 years ago

6 0

Answer:

Poisonous

Explanation:

This database has been established to help idenfity the poisonous plants or their source.

The main objective of this, is to help in the forensic analyis and other crime situations. Never the less, it can also help in other situations like camping.

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Place these hydrocarbons in order of decreasing boiling point. Compound Structure butane CH3CH2CH2CH3 pentane CH3CH2CH2CH2CH3 2,

Svetllana [295]

Answer:

Order of hydrocarbons in decreasing order of boiling point:

Paraffin > Hexadecane > Pentane > Dimethylpropane > Butane

Explanation:

Boiling points of hydrocarbons depend upon:

Mass of the hydrocarbon

Intermolecular forces of interaction

Hydrocarbons of greater mass or greater number of carbons have greater molecular mass.

Molecular formula of paraffin is $CH_3(CH2)_{33}CH3$

Molecular formula of hexadecane is $CH_3(CH2)_{14}CH3$

Among given hydrocarbons, number of carbon is highest in paraffin and hence has highest boiling point.

Boiling point of paraffin is followed by hexadecane having second highest number of carbon.

Mass of dimethylpropane and pentane are comparable. But boiling point of dimethylpropane is less than pentane. This is because branching decreases intermolecular force of attraction (van der Waal's force) which leads to decrease in boiling point.

No. of carbon in butane is least among given. So its boiling point is lowest.

Hence, Order of hydrocarbons in decreasing order of boiling point:

Paraffin > Hexadecane > Pentane > Dimethylpropane > Butane

7 0

3 years ago

Match the scientist to his contribution to the atomic theory - Thomson - Rutherford - Bohr A. Electron energy levels B. Nucleus

N76 [4]

Answer: Thomson - C

Rutherford - B

Bohr - A

Explanation: I just took the quiz

6 0

3 years ago

One year ago, you sold a put option on 100,000 euros with an expiration date of 1 year. you received a premium on the put option

pochemuha

There are two problems for this question:1. What is the total dollar amount of your profit and loss:
Put option premium is equal to 0.04 per unit.
The exercise price is 1.22
One option contract is 100,000
Selling price is 1.20
-Purchase prise is - 1.22
-Premium paid is +0.04
Net profit is = 0.02 x 100,000 = 2,000 – 80 = 1,920

2. Now undertake that as an alternative of taking a position in the put option one year ago, you sold a future's contract on 100,000 euros with a payment date of one year.
Find the total dollar amount of your profit or loss.
Solution: Contract to buy: $1.20 x 100,000 = 120,000 at payment date.
Contract to sell: $1.22 x 100,000 = 122,000 at settlement date
Settle contracts: -2,000 - 80 = -$2,080

5 0

3 years ago

In the reaction, 2H2 + O2 --> 2H2O, how many hydrogen molecules are needed to produce two water molecules?

Natali [406]

2 is the correct answer because with 2O2 molecules it balances the chemical equation.

Hope that helps

5 0

4 years ago

Which unit is not a measurement of volume? cm L ml Cm^3

Mademuasel [1]

Centimeters are units of length.

8 0

4 years ago