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Annette [7]
3 years ago
12

Which of the following human activities could have an irreversible effect on an ecosystem? I. introducing a new species II. urba

n sprawl III. introducing a new chemical IV. over-hunting
Chemistry
2 answers:
pav-90 [236]3 years ago
6 0
Introducimg a new chemicsl to the enviormrnt snd posssibly a new hunting techniquie 
Ulleksa [173]3 years ago
4 0

Answer: It is all of them

Explanation:I just had the question

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Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO?
Llana [10]
A mole is a rather unusual unit of measurement. It is defined by a specific number of particles, molecules, atoms, or any other unit. 
That number happens to be 6.022×10²³. 
When we talk about a mole of water, then, we refer to 6.022×10²³ molecules of water. 

Comparing 1 mole of 02 with 1 mole of CO:
This means means that both quantities will have the same number of molecules. The answer is C.

It may be tempting to select D, since it relates to the number of atoms rather than mass or volume, and moles are related to this idea. However, keep in mind that one mole of O2 will actually have twice as much oxygen atoms as one mole of CO, since there are two oxygen atoms per O2 molecule and only 1 oxygen atom per CO molecule.
5 0
3 years ago
Read 2 more answers
Classify the following sets of measurements as accurate, precise, both, or neither.
azamat

Answer:

Explanation:

Accuracy is defined is as the ability to perfectly repeat results in an experiment. It is simply reproducing the same set of result with little to no altercation.

Precision is nearness of the result to the true value.

(a) Checking for consistency in the weight of chocolate chip cookies: 17.27 g, 13.05 g, 19.46 g, 16.92 g

The result above is neither accurate nor precise. We can see a lot of inconsistencies in the readings shown and no repeatability whatsoever.

(b) Testing the volume of a batch of 25- mL pipettes: 27.02mL, 26.99 mL, 26.97 mL, 27.01 mL

The results here are accurate but not precise. They are a little bit off the 25mL mark but the experiment was able to reproduce nearly the same result.

(c)Determining the purity of gold: 99.9999%, 99.9998%, 99.9999%

This result is both precise and accurate. Pure Gold should be 100% and our values are very close. The experiment also was able to generate very accurate results.

3 0
3 years ago
A radioactive element having and atomic number 82 and atomic mass 214 emits a beta particle. The resulting element is:______.
aalyn [17]

Answer:

\frac{214}{83} Bi

Explanation:

In beta emission, a neutron is converted into a proton thereby reducing the neutron:proton (N/P) ratio.

When a beta emission occurs, the mass number remains the same while the nuclear charge increases by one unit. The daughter nucleus is found one place to the right of its parent in the periodic table.

5 0
3 years ago
Volcanoes and earthquakes are similar because they can occur from which of the following events?
KIM [24]

Answer:

A, Plate boundary movements.

Add-on:

hope this helped at all.

6 0
2 years ago
Read 2 more answers
A gas at 65°C occupies 4.0 L. At what temperature will the volume be 3.0 L?
Serjik [45]

Answer:

253.5 K

Explanation:

Charles law equation, which is as follows is used to solve this question:

V1/T1 = V2/T2

Where;

V1 = initial volume (Litres)

V2 = final volume (Litres)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the numerical information provided in this question:

V1 = 4.0 L

V2 = 3.0 L

T1 = 65°C = 65 + 273 = 338K

T2 = ?

Using V1/T1 = V2/T2

V1T2 = V2T1

T2 = V2 × T1/V1

T2 = 3 × 338/4

T2 = 1014/4

T2 = 253.5 K

4 0
3 years ago
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