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3 years ago

Balance this chemical equation

Chemistry

1 answer:

irina [24]3 years ago

3 0

Answer:

Explanation:

On the left side we have 3 Calcium atoms and 6 fluorine atoms

that means there need to be the same number on the right side

in the CaF2 molecules we already have 2 fluorine atoms so by multiplying with 3 we get 3 Ca and 6F

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In a heat engine, 500 J of heat enters the system, and the piston does 300 J of work. What is the final internal (thermal) energ

mylen [45]

Answer:

200J

Explanation:

This is because 500J - 300J = 200J

I hope this helps!!!

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3 years ago

What is a mixture ? How do homogeneous & heterogeneous mixtures differ ?

Stella [2.4K]

1st question: A mixture is when the components of a mixture can be easily separated and that the components each keep their original properties.

2nd question:A phase is any part of a sample that has a uniform composition and properties.By definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers.

Heterogeneous mixtures are not uniform in composition. Examples would be wood or blood. Homogeneous mixtures are uniform through out. Typically you can see through them.

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2 years ago

What is the period of a wave with a frequancy of 3 Hz and an amplitude off 0.01

lara31 [8.8K]

0.33 seconds is the period of a wave with a frequency of 3 Hz and an amplitude off 0.01 .

Explanation:

We have , period of a wave with a frequency of 3 Hz and an amplitude off 0.01 . We know that period of a wave is amount of time needed to complete one oscillation . In order to calculate period of wave we use frequency and the formula use is $period = \frac{1}{frequency}$ . We are given that frequency = 3 Hz:

$period = \frac{1}{frequency}$

⇒ $period = \frac{1}{frequency}$

⇒ $period = \frac{1}{3 Hz}$

⇒ $period = 0.33 seconds$

Therefore, 0.33 seconds is the period of a wave with a frequency of 3 Hz and an amplitude off 0.01 .

4 0

3 years ago

Rank the following bonds in order of decreasing bond length, based on periodic trends, starting with the longest bond at the top

sattari [20]

Answer:

H-BI,H-Se,H-S,H-I,H-Br

Explanation:

One thing that must be kept in mind is that atomic size increases down the group and decreases across the period. The bond lengths of species are influenced by the relative sizes of atoms or ions present in the bond.

The bonds in the answer have been arranged on basis of their decreasing atomic size because the greater the atomic size of the atoms, the greater the bond length and vice versa.

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3 years ago

P-fluoroanisole reacts with sulfur trioxide and sulfuric acid. Draw the major product of this substitution reaction; if applicab

Ipatiy [6.2K]

Answer: (Structure attached).

Explanation:

This type of reaction is an aromatic electrophilic substitution. The overall reaction is the replacement of a proton (H +) with an electrophile (E +) in the aromatic ring.

The aromatic ring in p-fluoroanisole has two sustituents, an halogen and a methoxy group, which are ortho-para directing substituents.

Aryl sulfonic acids are easily synthesized by an electrophilic substitution reaction aromatic using sulfur trioxide as an electrophile (very reactive).

The reaction occurs in three steps:

The attack on the electrophile forms the sigma complex.
The loss of a proton regenerates an aromatic ring.
The sulfonate group can be protonated in the presence of a strong acid (H₂SO₄).

Normally, a mixture of ortho-para substituted products would be obtained. However, since both para positions are occupied, only the ortho substituted product is obtained here.

8 0

3 years ago