Electrons move in what is called an atoms electron _______. Plz help me

Answers

Answer 1

Answer: Electrons move in what is called an electron cloud. Each atom has its own electron cloud associated with it. This region simply represents an area or likelihood within that an electron of corresponding energy can be found within.

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To test a hypothesis,a scientist designs a (n)------

Cohesion describes water's

Answers

Cohesion describes the 'sticking together of water molecules'

Answer:

Attraction to other water molecules

Explanation:

Hope it helped!

Name an object that the magnet would repel

Answers

the negative side of another magnet

How many grams of H20 is formed with 0.75 moles of NaOH

Answers

Answer: 13.5g

Explanation:

Moles = mass/molar mass

Molar mass of water= 18gmol-1

0.75=m/18

m= 17*0.75= 13.5g

A construction company recently filled in a local pond to build new houses. Duringthe following weeks, a local scientist noticed a decline in the mosquito population in
the area. The scientist wants to conduct a study that will measure the change in the
local mosquito population over a period of three months. Which research method
would give the scientist the best data for conducting his study?
A. a three-month case study observing the behavior of animals that depend on
mosquitoes for food
B. a survey asking residents about their observations of the local mosquito
population
C. a collection device in the area that counts the number of mosquitoes caught
weekly
D. a controlled lab experiment with mosquitoes that limits watercolor the
experimental group

Answers

Answer: (C.) a collection device in the area that counts the number of mosquitoes caught

weekly

Explanation: I took the test :D

Final answer:

The most suitable research method for measuring a change in the mosquito population due to construction would be 'a collection device in the area that counts the number of mosquitoes caught weekly'. This method provides quantifiable, reliable data over the three-month study period.

Explanation:

To thoroughly study the change in the local mosquito population due to the construction, the most suitable research method for the scientist would be to use 'a collection device in the area that counts the number of mosquitoes caught weekly' (option C). This method would provide direct, quantifiable data about the mosquito population, showing changes on a weekly basis over the three-month study period.

A case study (option A) would not provide direct data about the mosquito population. Instead, it would provide indirect observations through the behavior changes of animals that prey on mosquitoes. Similarly, a survey (option B) relies on residents' subjective observations, which may not be reliable or accurate. Finally, a controlled lab experiment (option D) does not account for the plethora of variables present in a natural environment, thus limiting its effectiveness in this situation.

Learn more about Research Method here:

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Identify the spectator ions in this reaction. Check all that apply. 2H+ + CrO4– + Ba2+ + 2OH– Ba2+ + CrO4– + 2H2O H+ CrO4– Ba2+ OH– 2H2O

Answers

Answer: CrO₄⁻ and Ba²⁺

Explanation:

1) Chemical equation given:

2H⁺ + CrO₄⁻ + Ba²⁺ + 2OH⁻ → Ba²⁺ + CrO₄⁻ + 2H₂O

2) Analysis

That is an oxidation-reduction equation (some species are been oxidized and others are being reduced).

The given equation is known as total ionic equation, because it shows all the species as ions that are part of the reaction.

2) Specator ions

Spectator ions are the ions that do not change their oxidation state and are easily identified as they are the same in the reactant and product sides.

Here the ions that are the same in the reactant and product sides are:

CrO₄⁻ and Ba²⁺

3) Addtitional explanation.

Once you identify the spectator ions you can delete them from the equation to obtain the net ionic equation , which in this case turns to be:

2H⁺ + 2OH⁻ → 2H₂O

But this is not part of the question; it is some context to help you understand the use of the spectator ions concept.

Answer: B and C on the tenth question of the assignment

How do everyday activities like driving a car and using electricity lead to global warming ?

Answers

Both driving a car and using electricity produce several greenhouse gases which can lead to global warming.Greenhouse gases are gases that, when released into the atmosphere, trap the heat from the sun's energy. Every day the energy from the sun reaches the earth. Some of the energy is reflected back into space and some of the energy is trapped by the earth's atmosphere. Most of the time the energy being trapped by the atmosphere serves to warm up the earth, so that the temperature does not fluctuate dramatically. In this way the atmosphere acts like a greenhouse - trapping the warmth in. One of the ways that electricity is made is by burning fossil fuels, like coal or fuel. When a fuel is burnt, some of the products are: carbon dioxide, carbon monoxide, and water - all of these gases are greenhouse gases. In a similar way driving a car also burns fossil fuels, and this will produce the same gases.Before lots of fossil fuels were burnt the greenhouse gases in the atmosphere would have been moderated by the carbon cycle. However, if we burn excess fossil fuels we are producing excess greenhouse gases. This can cause more heat to be trapped by the atmosphere and therefore the global temperature will start to rise - global warming. hope i helped

The emission of carbon due to excessive burning of fossil fuels for making electricity, driving cars and other things

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