CHEMISTRY HIGH SCHOOL

The first periodic table developed by Mendeleev was not completely accurate, but was a great step toward accomplishing the periodic table of elements we use today. Explain how the modern periodic table is credible today because of Mendeleev’s work.

Answers

Answer 1
Answer:

The answer is: elements in the same group of periodic system have similar properties.

Dmitri Mendeleev published a periodic table of the chemical elements in 1869.

Mendeleev noted gaps in the table and predicted then undiscovered elements existed eka-silicon (germanium) and eka-boron (scandium).

For example, germanium discovered in 1886 and it had proporties as Mendeleev predicted.

There are 118 unique substances (elements) arranged on an amazing chart that reveals their hidden secrets to anyone who knows how to read it.  

The first chemical element is hydrogen (atomic number is 1) and the last is oganesson (atomic number is 118).  

Elements are scheduled in periodic table, ordered by their atomic number.  
Answer 2
Answer: His periodic table provided everyone with the idea that elements should be arranged by the increasing order of their fundamental properties. It was later discovered that atomic number IS the fundamental property

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1. What kind of diagram shows how energy flows from one organism to another?a. producer c. consumer
b. ecology d. food chain

Answers

It would be D.the food chain

'why is a slanted paper tube considered a ramp?'

Answers

The incline could help things go up the incline plane therefore you can say it is an inclined plane. Hope this helped

Which best describes is the ∆G, ∆H, ∆S and T of a forest fire?

Answers

Below are the choices and the answer is C. 

A. ∆G=negative, ∆H= positive, ∆S= positive, T = large 
B. ∆G=positive, ∆H= positive, ∆S= positive, T = large 
C. ∆G=negative, ∆H= negative, ∆S= positive, T = large 
D. ∆G=negative, ∆H= positive, ∆S= negative, T = large 
E. ∆G=positive, ∆H= positive, ∆S= negative, T = large

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Which particle makes the atom an unstable isotope?

Answers

The particle that makes the atom an unstable isotope is either excess proton or excess neutron.

What is Unstable isotopes?

Unstable isotopes are isotopes of an element that have an excess of either protons or neutrons in their atomic nucleus, making them prone to undergo radioactive decay.

Radioactive decay is the process by which an unstable atomic nucleus releases energy in the form of radiation to achieve a more stable configuration.

The specific particles that can make an atom an unstable isotope are:

Protons: If an atom has an excessive number of protons in its nucleus, it can become unstable.

Neutrons: Similarly, if an atom has an excessive number of neutrons in its nucleus, it can become unstable.

Thus, the particle that makes the atom an unstable isotope is either excess proton or excess neutron.

Learn more about unstable isotopes here: brainly.com/question/12108854

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Instability of an atoms nucleus can result from an excess of either neutrons or protons . So neutrons and protons .

Which statement would be the most useful for deriving the ideal gas law? Volume is directly proportional to the number of moles. Volume is inversely proportional to the temperature. Pressure is directly proportional to the volume. Pressure is inversely proportional to the number of moles.

Answers

The answer is: Volume is directly proportional to the number of moles.

Given the ideal gas equation: PV = nRT

We can see that pressure (P) and volume (V) are on the left side of the equation, while the number of moles (n), the gas constant (R), and temperature (T) are on the right side.

If you increase/decrease the volume, this results in a direct increase/decrease of the number of moles, which proves the statement true. Volume is also directly proportional to temperature. Pressure is inversely proportional to volume, and directly proportional to the number of moles.

Answer:

A

Explanation:

The rock record indicates that photosynthesis began on Earth about 3.5 million years ago. a. True
b. False

Answers

Answer;

The above statement is false

Explanation;

Photosynthesis is the biological conversion of light or electromagnetic energy from the Sun into chemical energy. It occurs in green plants, algae, and some types of bacteria, and requires a series of biochemical reactions.

In photosynthesis, carbon dioxide and water react with one another in the presence of light and a chemical known as chlorophyll to produce a simple carbohydrate and oxygen.

Fossils of what are thought to be filamentous photosynthetic organisms have been dated at 3.4 billion years old. Geological evidence suggests that oxygenic photosynthesis, such as that in cyanobacteria, became important during the Paleoproterozoic era around 2 billion years ago.

I put true into the answer and it was wrong so it is actually FALSE.

The answer above is incorrect.
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