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Andrej [43]
3 years ago
8

Express in scientific notation. Choose the answer with the proper number of significant figures.

Chemistry
1 answer:
mojhsa [17]3 years ago
4 0
A&B YOU CAN SAY 69000000000=6.9x10^10&69x10^10
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Why are the transition metals able to show different properties like varying color and paramagnetism ?
Naya [18.7K]

Answer:

Colors of transition metal compounds are due to two types of electronic transitions. Due to the presence of unpaired d electrons, transition metals can form paramagnetic compounds. Transition metals are conductors of electricity, possess high density and high melting and boiling points.

Explanation:

4 0
2 years ago
Find [H+] of a 0.056 M hydrofluoric acid solution. Ka = 1.45 x 10-7
brilliants [131]

Answer:  [H^+] of 0.056 M HF solution is 8.96\times 10^{-5}

Explanation:

HF\rightarrow H^+F^-

 cM              0             0

c-c\alpha        c\alpha          c\alpha  

So dissociation constant will be:

K_a=\frac{(c\alpha)^{2}}{c-c\alpha}

Give c= 0.056 M and \alpha = ?

K_a=1.45\times 10^{-7}

Putting in the values we get:

1.45\times 10^{-7}=\frac{(0.056\times \alpha)^2}{(0.056-0.056\times \alpha)}

(\alpha)=0.0016

[H^+]=c\times \alpha

[H^+]=0.056\times 0.0016=8.96\times 10^{-5}  

Thus [H^+] of 0.056 M HF solution is 8.96\times 10^{-5}

8 0
3 years ago
Match these items with their examples.
kiruha [24]
Here you go! Feel free to ask questions!

7 0
3 years ago
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20 POINTS!!!
nasty-shy [4]

Answer:

300g of water because its a larger amount

Explanation:

3 0
3 years ago
An Olympic swimming pool is 50 meters long. You swim from one end to the other four times.How many meters do you swim?
barxatty [35]

Answer:

200 meters

Explanation:

if u swim for each end 4 times, and its 50 meters long, 50 x 4 = 200 meters

4 0
3 years ago
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