CHEMISTRY HIGH SCHOOL

Which of the following elements has the greatest atomic radius?A. potassium (K)
B. arsenic (As)
C. bromine (Br)
D. calcium (Ca)

Answers

Answer 1
Answer:

Answer:

A. Potassium (K)

Explanation:

The trend of atomic radius goes:

As group number increases, radius decreases

As period number increases, radius increases

Answer 2
Answer:

Answer:

francium

Explanation:

Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.

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In the following reaction 2C6H6 + 15O2 12CO2 + 6H2O how many grams of oxygen will react with 10.47 grams of benzene (C6H6)?
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The pressure the gas exert the walls of the container will decrease because the gas particles hit the wall of the container

Answers

The statement is false. The pressure of a gas do not decrease as the gas molecules hit the walls of the container. According to the Kinetic Molecular Theory, collisions of the gas molecules or with the walls of the container are perfectly elastic. This means that energy is not lost as the molecules collide with each other or with the walls of the container.

Butane mol A sample of an alcohol is tested and found to contain 52% carbon, 35% oxygen, and 13% hydrogen by mass. Tests indicate that the molecular weight of the molecule is between 30 and 80.
What is the molecular formula of the alcohol?

Answers

Answer:

C_(2)H_(6)O

Explanation:

For a compound as:

C_(a)H_(b)O_(c)

Let say your sample weighs 100 g, then you have

52 g of C

35 g of O

13 g of H

Now you need to calculate the  moles in the sample:

moles of C = 52 / 12 = 4.3333

moles of O = 35 / 16 = 2.1875

moles of H = 13 / 1 = 13

Now you divide the moles by the least to have a proportion (2.1875):

moles of C = 4.3333 / 2.1875 = 2

moles of O = 2.1875 / 2.1875 = 1

moles of H = 13 / 2.1875 = 6

So the molecule proportion of atoms is C:H:O = 2:6:1

C_(2x)H_(6x)O_(x)

Now to find x you have to calculate the MM:

MM C_(2x)H_(6x)O_(x) = 12 * 2x + 1 * 6x + 16 * x = 46x

For x = 1 => MM = 46(1) = 46

For x = 2 => MM = 46(2) = 92

Since the MM is between 30 and 80, x = 1

C_(2)H_(6)O

Which statement best summarizes the importance of Ernest Rutherford’s gold foil experiment?

Answers

Which statement best summarizes the importance of Ernest Rutherford’s gold foil experiment?
Ernest Rutherford discovered the half – life of an atom and the plum pudding model of an atom. 

Dalton's experiments advanced our understanding of the atom withoutA.carefully observing and measuring events.B.discovering the internal structure of the atom.C.examining the ratios of elements involved in chemical reactions.D.testing a hypothesis.

Answers

Answer:

B: Discovering the internal structure of the atom.

Explanation:

Dalton’s experiments with gases marked the beginning of the modern era of chemistry. The hypotheses about the nature of matter on which Dalton’s atomic theory is based can be

summarized as follows:

  1. Elements are composed of extremely small particles called atoms.
  2. All atoms of a given element are identical, having the same size, mass, and  chemical properties. The atoms of one element are different from the atoms of  all other elements.
  3. Compounds are composed of atoms of more than one element. In any compound,  the ratio of the numbers of atoms of any two of the elements present is either an  integer or a simple fraction.
  4. A chemical reaction involves only the separation, combination, or rearrangement  of atoms; it does not result in their creation or destruction.

Dalton made no attempt to describe the structure or composition  of atom —he had no idea what an atom is really like. But he did realize that the  different properties shown by elements such as hydrogen and oxygen can be explained  by assuming that hydrogen atoms are not the same as oxygen atoms.

What is combustion and how does it affect the carbon cycle?

Answers

combustion is burning and that usually produces carbon in the reaction adding it to the atmosphere

A national convention occurs every four years. Who is responsible for organizing this event? A. national party chairperson B. speaker of the house C. majority leader D. vice president

Answers

A national convention occurs every four years, so political parties can nominate their presidential bet for the coming elections. This signifies the end of a presidential primary season. It is convened by the political party's national committee, and is headed by the A. national party chairperson.
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