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3 years ago

What do we call the rows on the periodic table?A. periodB. familyC. groupD. metals

Chemistry

2 answers:

son4ous [18]3 years ago

8 0

Answer: A

Explanation: Period

TEA [102]3 years ago

3 0

I am pretty sure the answer is periods. Hope it helps. If not what are the answer choices?

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4. Ms. Desabille bought pork meat for P205.00 per kilo , about how much did she pay for 7.5 kilos?

oksian1 [2.3K]

A or C for number 4 and for number 5 it could be C

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3 years ago

lighting a match results in light and heat since energy was not created by the match what transformation took place

Feliz [49]

I think if was chemical energy hope I helped

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3 years ago

explain why iron can displace copper from copper II nitrate solution, but copper cannot displace iron from iron III nitrate solu

mihalych1998 [28]

Answer:

Iron metal is more reactive than copper.

Explanation:

Iron metal is more reactive than copper. ... Cu is less reactive than iron, therefore, cannot replace iron from iron sulphate (FeSO4). we have already seen that iron is more reactive than copper. So that means that in this reaction, copper is less reactive than iron. That means copper cannot displace iron. It cannot kick out iron from a sulfate.

4 0

3 years ago

A solid weak acid is weighed, dissolved in water and diluted to exactly 50.00 ml. 25.00 ml of the solution is taken out and is t

Artist 52 [7]

Answer:

pKa = 3.51

Explanation:

The titration of acid solution with NaOH can be illustrated as:

$AH + NaOH \to NaA + H_2O$

Given that:

Volume of acid solution $(V_1) = 25 \ mL$

Volume of NaOH $(V_2) = 18.8 \ mL$

Molarity of acid solution $(M_1) = ???$

Molarity of NaOH $(M_2) = 0.10 \ M$

For Neutralization reaction:

$M_1V_1 = M_2V_2$

Making $M_1$ the subject of the formula; we have:

$M_1 = \frac{M_2V_2}{V_1}$

$M_1 = \frac{0.10*18.8}{25}$

$M_1 =0.0752 \ M$

However; since the number of moles of NaA formed is equal to the number of moles of NaOH used : Then :

$M_2V_2 = 0.10 *18.8 = 1.88 \ mm$

Total Volume after titration = ( 25 + 18.8 ) m

= 43.8 mL

Molarity of salt (NaA ) solution = $\frac{number \ of \ moles}{Volume \ (mL)}$

= $\frac{1.88}{43.8}$

= 0.0429 M

After mixing the two solution ; the volume of half neutralize solution is = 25 mL + 43.8 mL

= 68.8 mL

Molarity of NaA before mixing $M_1 = 0.0429 \ M$

Volume $(V_1) = 43.8 \ mL$

Molarity of NaA after mixing $M_2 = ???$

Volume $(V_2 ) = 68.8 \ mL$

∴

$M_2 = \frac{M_1*V_1}{V_2} \\ \\ M_2 = \frac{0.0429*43.1}{68.8} \\ \\ M_2 = 0.0273 \ M$

Molarity of acid before mixing = 0.0725 M

Volume = 25 mL

Molarity of acid after mixing = $\frac{0.0752*25}{68.8}$

= 0.0273 M

Since this is a buffer solution ; then using Henderson Hasselbalch Equation

$pH = pKa + log \frac{[salt]}{[acid]}$

$3.51= pKa + log \frac{[0.0273]}{[0.0273]} \\ \\ 3.51= pKa + log \ 1 \\ \\ 3.51= pKa + 0 \\ \\ pKa = 3.51$

4 0

4 years ago

Explain how a hurricane poses a threat to life and the biosphere. Use complete sentences.

Snezhnost [94]

Answer:

A hurricane can cause extreme damage to the biosphere and the geosphere. A hurricane can leave water standing therefore sinking itself into the geosphere. The biosphere can be permanently effected because it can kill, injure, and destroy the biosphere and what the biosphere creates (buildings, parks).

Explanation:

4 0

3 years ago

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