All categories

3 years ago

Which theory belongs in place of the question mark in Tran’s timeline?

1 answer:

5 0

Assuming that the timeline that you're referring to is in the year of 1803, the theory is probably belong to Dalton
In 1803, John Dalton proposed a theory that would change the field of chemistry for the rest of the time, which is the discovery of atom

hope this helps

You might be interested in

The mass of a diamond that has a volume of 0.35cm3

MAXImum [283]

Answer:

1.225g

Explanation:

From the question given,

Volume of diamond = 0.35cm^3

Density of diamond = 3.5g/cm^3

Mass of diamond =?

Density = Mass /volume

Mass = Density x volume

Mass = 3.5 x 0.35

Mass of diamond = 1.225g

3 0

2 years ago

Write an equation that shows the reaction between acetic acid and triethylamine (CH3CH2)3N. Draw all non-bonding lone electron p

Anni [7]

Answer:

-) Acid-base reaction

-) Carboxylic acid, alcohol, alkene and ketone

Explanation:

For the reaction between acetic acid and triethylamine, we will have an acid-base reaction. Therefore a salt would be produced in this case an "ammonium quaternary salt". Also, we have to remember that on this reaction the acid is the acetic acid and the base is the triethylamine. See figure 1

For the second question, we have to check the structure of Prostaglandin E1 in which we have the functional groups:

1) Carboxylic acid

2) Alcohol

3) Alkene

4) Ketone

See figure 2.

I hope it helps!

8 0

3 years ago

Which of the following statements is TRUE? Which of the following statements is TRUE? Electrons placed in antibonding orbitals s

marusya05 [52]

Answer:

When two atomic orbitals come together to form two molecular orbitals, one molecular orbital will be lower in energy than the two separate atomic orbitals and one molecular orbital will be higher in energy than the separate atomic orbitals.

Explanation:

Which of the following statements is TRUE?

Electrons placed in antibonding orbitals stabilize the ion/molecule. FALSE. Electrons in the antibonding orbitals destabilize the ion/molecule.

The total number of molecular orbitals formed doesn't always equal the number of atomic orbitals in the set. FALSE. The total number of molecular orbitals is always equal to the number of atomic orbitals in the set.

When two atomic orbitals come together to form two molecular orbitals, one molecular orbital will be lower in energy than the two separate atomic orbitals and one molecular orbital will be higher in energy than the separate atomic orbitals. TRUE. The orbital with lower energy will be the bonding orbital and the one with higher energy will be the antibonding orbital.

A bond order of 0 represents a stable chemical bond. FALSE. A chemical bond is stable if the bond order is higher than zero.

5 0

3 years ago

Consider this reaction: →2NH3g+N2g3H2g At a certain temperature it obeys this rate law: rate =2.11·M−1s−1NH32 Suppose a vessel c

enot [183]

Answer: It takes 5.89 s for the concentration of $NH_3$ to decrease by 88.0%.

Explanation:

$2NH_3(g)\rightarrow N_2(g)+3H_2(g)$

As the units of rate constant is $M^{-1}s^{-1}$ , the kinetics must be second order.

Integrated rate law for second order kinetics is given by:

$\frac{1}{a}=kt+\frac{1}{a_0}$

$a_0$ = initiaal concentration = 0.590 M

a= concentration left after time t = $0.590-\frac{88}{100}\times 0.590=0.0708M$

$\frac{1}{0.0708}=2.11\times t+\frac{1}{0.590}$

$t=5.89s$

Thus it takes 5.89 seconds for the concentration of $NH_3$ to decrease by 88.0%.

6 0

3 years ago

PLEASE ANSWERRRRRRRRR

Inessa [10]

C. An electromagnet is temporary and is magnetic when a current flows through a wire wrapped around the core.

It is because electromagnet are the solenoid that behave like a magnet during the flow of an electric current through it. They are temporary.

7 0

3 years ago