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3 years ago

What is the correct answer and why?

Chemistry

1 answer:

MariettaO [177]3 years ago

7 0

A) number of neutrons in the nucleus... all isotopes of an element contain the same number of protons which is equal to that elements atomic number...
hope this helps!

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The pH of saliva is normally in the range of 6.4 to 7.0. However, when a person is ill, the person's saliva becomes more acidic.

Firlakuza [10]

Answer: The hydrogen ion concentration of his saliva is $7.94\times 10^{-7}M$

Explanation:

pH is defined as the negative logarithm of hydrogen ion concentration present in the solution.

To calculate the pH of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

pH of the saliva = 6.1

Putting values in above equation, we get:

$6.1=-\log[H^+]$

$[H^+]=10^{-6.1}=7.94\times 10^{-7}M$

Hence, the hydrogen ion concentration of his saliva is $7.94\times 10^{-7}M$

5 0

3 years ago

3. All the following steps need to be followed when naming alkanes, except A. locating the longest carbon chain. B. using prefix

gulaghasi [49]

Answer:

D. beginning numbering at the end farther from the first branch.

Explanation:

In naming alkanes, the longest continuous chain in the compound is first considered and this gives the name of the compound intended. The name of the substituent on the compound are also arranged in alphabetical order when naming the compound.

The carbon atoms are numbered in the parent chain or ring to indicate where branching or substitution takes place. The direction of numbering is chosen such that the lowest numbers possible is given to the branches or substituents. If we begin the numbering at the end farther from the first branch, we won't give the lowest numbers possible to the branches.

8 0

4 years ago

Using the phase diagram for CO2, what phase is carbon dioxide in at -20°C

djyliett [7]

Answer:

A. It is in the gas phase.

Explanation:

it was correct on ap3x :)

5 0

3 years ago

Consider these compounds:

Gnom [1K]

Explanation:

If we compare its solubility products without any calculation then, Magnesium hydroxide is more soluble than compound A and C. Magnesium hydroxide is less soluble than compound D.

- The solubility product of magnesium hydroxide and zinc carbonate is same so it is not possible to determine whether it is more or less soluble than compound B

6 0

3 years ago

Electrons are always shared evenly during covalent bonding. O True False

neonofarm [45]

Answer:

False

Explanation:

There are two types of covalent bonding: polar covalent boding and nonpolar covalent bonding. During polar covalent bonding, the electrons are not shared evenly. This is due to the electronegativity differences between the two atoms. During nonpolar covalent bonding, the electrons are shared evenly.

8 0

2 years ago