CHEMISTRY MIDDLE SCHOOL

238,2U --> 234Th +
90

Answers

Answer 1
Answer:

Answer:

\n_(2)^(4) \alpha

Explanation:

In this question, we wish to find the missing nuclei for the equation:

\n_(92)^(238) U\rightarrow _(90)^(234) Th + _(Z)^(A) X

In order to find the missing species, we need to use the charge and mass balance law. That is, the mass should be conserved: the total mass on the left-hand side with respect to the arrow should be equal to the total mass on the right-hand side with respect to the arrow:

238 = 234 + A

Notice from here that:

A = 238 - 234 = 4

So far we know that the mass of X is 4. Similarly, we apply the law of charge conservation. The total charge should be conserved:

92=90+Z

From here:

Z = 92-90=2

We have a particle:

\n_(2)^(4) X

Looking at the periodic table, an atom with Z = 2 corresponds to helium. This can also be written as an alpha particle:

\n_(2)^(4) \alpha

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What type of allele masks the expression of the recessive allele?

Answers

The Dominant trait or allele masks the recessive because it is dominant. an easy way to remember this is how the lead wolf (dominant alleles) shows it's dominance over the rest of the pack (the recessive alleles)

Could a mixture be made up of only elements and no compounds? explain.

Answers

yes , because all elements are made of atoms and elements are the building blocks of the universe because everything is made of elements, therefore all matter is made up of atoms and compounds are made of elements, which are made up of atoms sooooo yes you can only make a mixture with elements and compounds

How fast do you think the air particles in this room are moving compared to a car going 50 mph (about 22m/s)? Put your answer is in the form, 'a molecule travels ___ as fast as a car"

Answers

Based on the calculations, a molecule travels 22.73 as fast as a car.

Given the following data:

  • Speed of car = 50 mph (22 m/s)

Under standard temperature and pressure (room conditions), the speed of an average molecule is equal to 500 meter per seconds. Thus, the speed of air particle is 500 m/s.

To determine how fast (rate) the air particles in a room are moving compared to a car, we would use this formula:

Rate = (Speed \;of\;air\;particles)/(Speed \;of\;car)

Substituting the given parameters into the formula, we have;

Rate =(500)/(22)

Rate = 22.73

Read more on speed here: brainly.com/question/10545161

The average molecule of air is moving at speed of 500 m /s and thus

speed of air particle = 500 m /s

speed of car = 22 m /s

Whereas, the speed of molecule /speed of car = 500 /22 = 22.72

Thus, molecule travel at 22.72 times faster than speed of car.

Which term identifies a type of organic reaction?(1) deposition (3) esterification
(2) distillation (4) sublimation

Answers

The answer is (3) esterification. Note that deposition, distillation and sublimation are not chemical changes, they are physical changes, so you can solve this question by elimination if you know that. Regarding sterification it is a well known chemical reaction that consists on the formation of esters from carboxilic acids.

Answer:

(3) esterification

Explanation:

1) Deposition is a process in which a vapor directly condenses into a solid. It is the reverse of sublimation and therefore a process which involves a physical/phase change.

2) Distillation is a process in which a liquid mixture is separated based on the differences in their boiling points. This is a physical separation and not any form of a chemical change.

3)Esterification is an organic reaction in which a carboxylic acid is treated with an alcohol to form an ester.

4) Sublimation is again a physical/phase change process in which a solid gets converted into a gas.

What is an object with a very high resistance classified as?

Answers

If the resistance is electrical, then that substance is an 'insulator'.

The Center of the Adam is called

Answers

Answer:

The center of an Atom is called the Nucleus.

Explanation:

Answer: the center of an atom is called the nucleus and is made of protons and neutrons

Explanation:
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