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timofeeve [1]
3 years ago
10

True or false acids have ph level below 7

Chemistry
2 answers:
coldgirl [10]3 years ago
5 0
True, if it is a pH below 7 its an acid but if the pH is above 7 its an alkaline and if its 7 its neutral
schepotkina [342]3 years ago
4 0
True , cause 7 would be neutral and above seven isnt
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An archaeologist graduate student found a leg bone of a large animal during the building of a new science building. The bone had
Vlad [161]

Answer : The time passed in years is 2.74\times 10^2\text{ years}

Explanation :

Half-life of carbon-14 = 5730 years

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{5730\text{ years}}

k=1.21\times 10^{-4}\text{ years}^{-1}

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 1.21\times 10^{-4}\text{ years}^{-1}

t = time passed by the sample  = ?

a = initial amount of the reactant disintegrate = 15.3

a - x = amount left after decay process = 14.8

Now put all the given values in above equation, we get

t=\frac{2.303}{1.21\times 10^{-4}}\log\frac{15.3}{14.8}

t=274.64\text{ years}=2.74\times 10^2\text{ years}

Therefore, the time passed in years is 2.74\times 10^2\text{ years}

4 0
3 years ago
What would you call the following chemical reaction, Zn(s) + H2O(g) – Zno (s) + H2(g)
egoroff_w [7]

I'd say it's single replacement/displacement

5 0
3 years ago
14 POINTS!! What is the atomic number of the first element to start filling an "f" sub-level?
emmasim [6.3K]
<span>What is the atomic number of the first element to start filling an "f" sub-level?
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7 0
3 years ago
Read 2 more answers
What are the isomers of butanol​
Juliette [100K]

There are three other structural isomers of 1-butanol: 2-butanol (sec-butyl alcohol), 2-methyl-1-propanol (isobutyl alcohol), and 2-methyl-2-propanol (tert-butyl alcohol). 2-Butanol, or sec-butanol, or sec-butyl alcohol, or s-butyl alcohol, is a four-carbon chain, with the OH group on the second carbon.

Chemicals of this type: Ethanol

Hope this helps

7 0
3 years ago
Which substance has a nonpolar covalent bonds? <br><br> Cl2<br> SO3<br> SiO2<br> CCl4
Nikolay [14]

Answer:

Substance with a nonpolar covalent bonds is Cl_2.

Explanation:

Polar covalent compound: This compound is formed when difference in electronegativity between the atoms is present. When atoms of different elements combine, it results in the formation of polar covalent bond. For Example: CO_2,NO_2 etc..

Non-polar covalent compound: This compound is formed when there is no difference in electronegativity between the atoms. When atoms of the same element combine, it results in the formation of non-polar covalent bond. For Example: N_2,O_2 etc.

Substance with a nonpolar covalent bonds is Cl_2.

7 0
3 years ago
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