CHEMISTRY MIDDLE SCHOOL

An atomic nucleus is composed ofA)protons.
B)protons and neutrons.
C)protons and electrons.
D)protons, neutrons, and electrons.

Answers

Answer 1
Answer:

Answer:

B)protons and neutrons.

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Everybody kept debating about is water wet so what you think?

The accepted value for the percent by mass of water in a hydrate is 36.0%. In a laboratory activity, a student determined the percent by mass of water in the hydrate to be 37.8%. What is the percent error for the student's measured value?(1) 5.0% (3) 1.8%

(2) 4.8% (4) 0.05%

Answers

The original or accepted value for the percent by mass of water in a hydrate = 36%
Percen by mass of water in the hydrate determined by the student
in the laboratory = 37.8%
So the difference between the actual and the percent by mass in water determined by student = (37.8 - 36.0)%
             = 1.8%
So the percentage of error made by the student = (1.8/36) * 100 percent
                                                                             = (18/360) * 100 percent
                                                                             = ( 1/20) * 100 percent
                                                                              = 5 percent
So the student makes an error of 5%. Option "1" is the correct option.

Answer:

5%

Explanation:

Which of the following could cause a habitat change?a introduction of an invasive species
b. a wildfire
a mudslide
d. all of the above
Please select the best answer from the choices provided

Answers

A habitat change can be caused by introduction of an invasive species, wildlife and mudslides. Therefore, option (d) is correct.

What is habitat change?

Habitat change can take place naturally through disease, droughts, fire, hurricanes, mudslides, volcanoes, earthquakes, or precipitation, etc.

However, it is commonly induced by human activities like land use change and physical modification of rivers.

Habitats can change over time due to natural and manmade effects. Natural influences involve seasonal changes, drought, flooding, and natural succession. Manmade effects include conversion of land from forests to farms, and pollution.

Habitat destruction through natural processes like volcanism, wildfire, and climate change. Habitat fragmentation of tropical rainforests led to a great loss of amphibian diversity, but at same time the drier climate spurred on a burst of diversity among reptiles.

An invasive species are an introduced organism that gets overpopulated and harms new environment.

Therefore, mudslides, wildlife and invasive species can cause habitat change.

Learn more about habitat change, here:

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I believe it is all of the above

What is a particle found in the nucleus with a natural no electrical charge

Answers

The answer is neutrons.

How many steps to complete mitosis and meiosis??

Answers

mitosis has 4 steps and meiosis has 5 steps so its 9 steps total here's a photo to help you if you need it
Mitosis: Prophase, Metaphase, Anaphase, Telophase 

Meiosis: Prophase I, Metaphase I, Anaphase I, Telophase I, Prophase II, Metaphase II, Anaphase II, Telophase II

What should we do to increase energy efficiency ?

Answers

Answer:

Insulate your loft.

Upgrade your boiler

Hang thick curtains and insulate your doors.

Watch your energy consumption.

Switch to a cheaper energy tariff.

Use a water-saving showerhead.

Fit double glazing.

Explanation:

Some Help

What is the purpose of a catalyst in the production of hydrogen?

Answers

Answer:To speed up the rate of hydrogen production

Explanation:

In the preparation of Hydrogen from the action of dilute acid on zinc metal, few drops of Copper(II)tetraoxosulphate(VI) solution is added to speed up the rate of production.

The hydrogen produced is shown in the equation below

Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)

Thus, Copper(II)tetraoxosulphate(VI) solution, a catalyst is used to speed up hydrogen production.
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