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3 years ago

All atoms of the same element must have the same number of what?

Chemistry

2 answers:

Pavel [41]3 years ago

6 0

Answer:

Explanation:

i just took the test and chose A.protons. lily~chan hopes she helps

torisob [31]3 years ago

3 0

Answer:

A. protons

I hope this helps!

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C6H1206 +602 → 6002 + 6H20 AH = -2,799 kJ

trapecia [35]

Answer:

C^6 H^1206, 602,6002, 6H ^20, 2799 AHkJ, 100g C^6 H^1206

Explanation:

4 0

3 years ago

The reason your classmate cannot find the compound in a chemical reference manual is that 2,4-diethyl-4-ethoxyhexane is the inco

Georgia [21]

Answer:

3-ethoxy-3-ethyl-5-methylheptane

Explanation:

In this case, we have to identify the longest chain of carbon in this case the longest chain is made with 7 carbons. Then we have to assign carbon 1. In this case, carbon 1 is the one nearest to the ethoxy group. With this in mind, we will have a methyl on carbon 5, a methyl on carbon 3 and an ethoxy group in carbon 3, so the name would be 3-ethoxy-3-ethyl-5-methylheptane.

See figure 1

I hope it helps!

8 0

2 years ago

Calcium levels in people are normally distributed with a mean of 9.5 mg/dL and a standard deviation of 0.3 mg/dL. Individuals wi

34kurt

Answer:

9.1 mg/dL

Explanation:

A normal distribution is symmetrical, the area below the curve of negative Z-scores is equal to the area below the curve of positive Z-scores, Z measures the statistic observed and the parameter of the population.

And it is:

Z = (x - μ)/σ

where μ is the mean (9.5 mg/dL), x is the borderline, and σ is the standard deviation, which is 0.3 mg/dL.

The Z-score can be calculated in excel by the function =NORMSINV, and the factor will be the percente considered (10% = 0.1)

NORMSINV(0.1) = -1.28155

So,

-1.28155 = (x - 9.5)/0.3

x - 9.5 = -0.384465

x = 9.1 mg/dL

6 0

3 years ago

Which part of the ocean has the lowest temperatures and highest salinity?

KatRina [158]

Answer:

The north atlantic contains the warmest and saltiest water of the major oceans, the southern ocean is the coldest, the north pacific has the lowest average salinity. This density signature is locked into the water parcel when it sinks

Explanation:

i think

8 0

3 years ago

How many moles of helium gas are contained in a 4.0 L flask at STP

Ratling [72]

First, you convert liters to moles.
Usually you have to go to grams but this is STP.

Get moles directly by dividing the 4 by STP (22.4)
$\frac{4}{22.4} =0.17857142857$
About $1.8*10^{-1}$ or 0.18 moles whichever your teacher prefers

3 0

3 years ago