CHEMISTRY HIGH SCHOOL

Water is moving across a membrane from solution a into solutionb. What can be inferred? Solution a must be pure water. Solution a must have a lower solute concentration than solution
b. Solution a must have a higher solute concentration than solution
b. Solution a and solution b must have the same concentration of solutes. Solution b must be pure water.

Answers

Answer 1
Answer:

The answer is solution a must have a lower solute concentration than solution  b.

That is when water is moving across a membrane from solution a into solution b, then solution a must have a lower solute concentration than solution  b.

When solution a have a lower solute concentration than solution  b, then water moves across a membrane from solution a into solution b.

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What is the percent by mass of water in Na2SO4 • 10H2O?

A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?

Answers

The overall total would be (3-) charge. Hope I helped./ 

The overall total would be (3-) charge

Explain why a solution can have many solutes, but only one solvent.

Answers

A solution is a homogenous mixture of substances with variable composition. The substance present in the major proportion is called the solvent, whereas the substance present in the minor proportion is called the solute. It is possible to have solutions composed of several solutes. The process of a solute dissolving in a solute is called dissolution. 

          Many common mixtures (like concrete) are heterogeneous —the components and properties of such mixtures are not distributed uniformly throughout their structures. Conversely, solutions are said to be homogeneous because they have uniform composition and properties. Solutions are intimate and random homogeneous mixtures of atomic-size chemical species, ions, or molecules.
The solvent is the most abundant substance in a solution. In a 51/49 mixture of water and alcohol, water is the solvent whereas in a 49/51 mixture, alcohol is the solvent.

Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter. Use 3 - 4 sentences in your explanation.

Answers

The model of the atom is crucial because without it we wouldn't know how the protons, neutrons, and electrons are connected. Essentially, the protons and neutrons are seen with their bonds while electrons are rotating waves of energy that go around the atom. This model helps us differentiate different elements and isotopes based on the number of components and the way they are connected.

Understanding the model of the atom helps predict how elements will react with each other.

For example, the ball-and-stick model is a molecular model of a chemical substance which is to display both the three-dimensional position of the atoms and the bonds between them.

The atoms are represented by spheres, connected by rods which represent the bonds.

Every ball represent one atom in one molecule and they have different colors for different atoms (for example, carbon is black, hydrogen is white, nitrogen is blue).

There also other models: skeletal models, polyhedral models, composite models, computer-based models.

Which of the following is true of group 6A?Includes Chlorine

Includes Sulfur

Gain 2 electrons

Tend to form +2 ions

Have 5 valence electrons

Answers

Answer:

The answer to your question is: Includes sulfur and gain two electrons

Explanation:

Includes Chlorine  This option is wrong, Chlorine belongs to group VII.

Includes Sulfur  This option is true, Group VI includes Oxygen, Sulfur, Selenium, Tellurium.

Gain 2 electrons. This option is true, Elements in group VI have six valence electrons so they gain to electrons to become estable.

Tend to form +2 ions  This option is wrong, this elements form -2 ions

Have 5 valence electrons This option is wrong, this elements have 6 valence electrons.

A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state.This emitted energy can be used to determine theA) mass of the sample
B) volume of the sample
C) identity of the element
D) number of moles of the element

Answers

The answer is C. The specific amount of energy emitted when electrons jump from excited states to the ground state refers to emission spectrum. The energy is emitted in the form of photons, and the photons have very specific wavelengths (energy) that correspond to the energy gaps between the excited states and the ground state. The specific wavelengths of light emitted are referred to as the "emission spectrum," and each element produces a different emission spectrum. Thus, this emitted energy can be used to identify the element from which your sample was taken.

Answer:

C.

Explanation:

Primaries, the secret ballot, and the use ofreferendum and recall were efforts made during
the Progressive Era to
(1) preserve the power of political machines
(2) provide equal political rights for Native
American Indians
(3) protect States rights against federal power
(4) increase citizen participation in government

Answers

(4) Increase citizen participation in government

Primary: a way for citizens to vote for new government officials, not too influenced by party leaders
Secret Ballot: keeping a voter's votes private from others
Recall: a way for citizens to remove a government official from office
Referendum: a way for citizens to vote for or against something proposed by the legislature

During the Progressive Era, many local governments were lead by corrupt political machines. They would rig elections in their favor as well as threaten those who voted against them. Many would appoint their supporters who weren't usually qualified to government positions as incentive to vote for them (I don't know if you care but that's called the spoils system).

It's not (1) because the whole point of primaries, secret ballots, recalls, and referendums was so political machines were not dominating
It's not (2) because none of this has a lot to do with Native Americans
It's not (3) because the political machines were a local government problem, not federal
It IS (4) because by getting more people involved in the government, they can elect qualified officials, vote on laws that best benefit the people, and minimize corruption.
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