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Maru [420]
3 years ago
12

Plz help me I Am timed plz

Chemistry
1 answer:
nexus9112 [7]3 years ago
3 0

Answer:

D) Trees

Explanation:

I'm sure its trees, because once you cut all trees you cant regenerate, or replenish them. hope im right, sorry of its wrong!!

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Consider the reaction below:
IRINA_888 [86]
What are <span>stoichiometry equations?</span>
5 0
3 years ago
If an element has more than one ionic charge, how is that piece of information represented in a chemical name?
Lostsunrise [7]
Usually with roman numerals, like iron (II) chromate
iron has a charge of 2
or manganese (IV) oxide, manganese has a charge of 4
(these are ionic compounds just to let you know)

3 0
3 years ago
Using complete subshell notation (1s22s22p6, and so forth), predict the electron configuration of each of the following atoms: a
masha68 [24]

Answer: a) C:6:1s^22s^22p^2

b) P:15:P:1s^22s^22p^63s^23p^3

c) Sb:1s^22s^22p^63s^23p^64s^23d^{10}4p^64d^{10}5s^25p^3

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration:

a) C:6:1s^22s^22p^2

b) P:15:P:1s^22s^22p^63s^23p^3

c) Sb:1s^22s^22p^63s^23p^64s^23d^{10}4p^64d^{10}5s^25p^3

4 0
4 years ago
Is water a element or compond <br> and is it a homogeneous or heterogeneous
crimeas [40]

Answer:

Water is a compound. It contains more than one element

water is homogeneous

8 0
3 years ago
Read 2 more answers
The mean for a set of measurements is 4.17 and the standard deviation is 0.14. To show 95% confidence limits, we can write the r
Black_prince [1.1K]

Answer:

The 95% confidence level is

4.17 \pm 0.2744

Explanation:

If we can apply the central limit theorem, we can approximate this distribution to a normal distribution.

The confidence level (for n=1) is defined as

X\pm \frac{z*\sigma}{\sqrt{n}}=X\pm z*\sigma

For a 95% confidence interval, according to the normal distribution, z=1.96.

Then we have:

X\pm z*\sigma=4.17 \pm 1.96*0.14=4.17 \pm 0.2744

6 0
3 years ago
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