CHEMISTRY MIDDLE SCHOOL

| Solve
-15 =5m/7 find m​

Answers

Answer 1
Answer:

Answer:

m= −21

Explanation:

Solve for m by simplifying both sides of the equation, then isolating the variable. m=−21

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How did each of the scientists below contribute to the scientific understanding of the atom?Aristotle, Democritus, Dalton, Thompson, Rutherford, Chadwick, Bohr, and Becquerel and the Curies

Due to the length of the question I am giving 25 points per person

Answers

Aristotle (322 BCE) was a Greek philosopher and scientist born in the Macedonian city of Stagirus.
He had many good ideas about science but his ideas about atomic theory were not and unfortunately they were accepted for over two thousand years. His predecessors, Democritus and Leucippus more correct ideas on atomic theory were forgotten.
He believed that there were only five elements: air which was light, earth which was cool and heavy, water which was wet, fire which was hot, and Aether which he viewed as a divine substance which made up the stars and planets. Aristotle believed that all matter was made up either of one of the elements of water air earth and fire or combinations of these four elements, with the exception of stars and planets which were made of aether. He thought that no matter how many times you split matter, it always goes into a smaller piece of that matter.
Aristotle’s theory of matter has been proven wrong. Many more elements have been discovered. Just Looking at the periodic table proves this. The only thing Aristotle discovered that carries on to the modern atomic theory is the fact that there are elements, which is implied in Aristotle’s theory. A negative point about his theories it that they were accepted until the seventeenth century until physicists (then termed natural philosophers) such Isaac Newton and Gottfried Leibniz began work that would ultimately disprove them.

How many electrons can be held in the second orbital (closest to the nucleus)

Answers

The number of electrons that can be held in the second orbital (closest to the nucleus) is 8 electrons

How to determine the number of electrons in the 2nd orbital?

The arrangementof electrons in various energy levels or orbital follows a well defined order. This can be determined by using the following formula:

Number of electrons = 2n²

Where

  • n is the number of orbital/shell

Now, we shall obtain the number of electrons in the second orbital. Details below:

  • Number of shell = 2
  • Number of electrons =?

Number of electrons = 2n²

= 2 × 2²

= 2 × 4

= 8 electrons

Thus, the number of electrons in the second orbital is 8 electrons

Learn more about number electrons in energy levels:

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the orbital is called an energy level and they follow an 2/8/8 rule.
2 in the first
8 in the second
and
8 in the third.
so 8 would be the answer.

1. The reaction below describes cellular respiration. Which compounds are the reactants and which are theproducts? (10 points)
C6 H12 O6 + 6 O2 + 6 CO2 + 6 H2O

Answers

Answer:

C₆H₁₂O₆ and O₂ are reactant.

CO₂ and H₂O are products.

C₆H₁₂O₆ + 6O₂  →  6CO₂ + 6H₂O + ATP

Explanation:

There are two types of respiration:

1. Aerobic respiration  

2. Anaerobic respiration

Aerobic respiration

It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.

Glucose + oxygen → carbon dioxide + water + 38ATP

Anaerobic Respiration

It is the breakdown of glucose molecule in the absence of oxygen and produce small amount of energy. Alcohol or lactic acid and carbon dioxide are also produced as byproducts.  

Glucose→ lactic acid/alcohol + 2ATP + carbon dioxide

This process use respiratory electron transport chain as electron acceptor instead of oxygen. It is mostly occur in prokaryotes. Its main advantage is that it produce energy (ATP) very quickly as compared to aerobic respiration.

Steps involve in anaerobic respiration are:

Glycolysis

Glycolysis is the first step of both aerobic and anaerobic respiration. It involve the breakdown of one glucose molecule into pyruvate and 2ATP.

Fermentation

The second step of anaerobic respiration is fermentation. It involve the fermentation of pyruvate into lactic acid or alcohol depending upon the organism in which it is taking place. There is no ATP produced, however carbon dioxide is released in this step.

Where can you find hydrochloric acid in your body? What does it do?

Answers

stomach
digest your food
Its found in your stomach and breaks down proteins

How can an organism have the same phenotype, but different genotypes?

Answers

Yes, an organism can have the same phenotype but different genotypes.
Genotype is the genetic makeup.
Phenotype is physical appearance.

Alleles are forms of a gene. ex. Brown eyes are dominant over blue eyes. Blue eyes are recessive.

What scientists do that is the basis for their investigations

Answers

Scientists conduct investigations based on systematic observations, research questions, and the development of testable hypotheses.

What isd the wprk of scientists

They design experiments, collect data, and analyze it using statistical methods. Peer review and replication are important for ensuring the validity of findings.

Scientists collaborate, communicate their results, and develop theories to explain natural phenomena. The scientific method and critical thinking are central to their work.

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Scientists use curiosity, imagination, and previous scientific study to create research questions and hypotheses to begin their investigations into natural phenomenon. They use this process which formally is called the scientific method to carefully construct experiments to guide investigations of the world around them. 
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