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telo118 [61]
3 years ago
13

Help me please quick!

Chemistry
2 answers:
neonofarm [45]3 years ago
6 0

Answer:

last one

they can contain mercury that is Very harmful to humans

kirill [66]3 years ago
6 0
C is the right anger
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How many moles of KOH are required to produce 4.79 g K3PO4 according to the following reaction? 3KOH + H3PO4 -----> K3PO4 + 3
8_murik_8 [283]

Answer:

0.677 moles

Explanation:

Take the atomic mass of K = 39.1, O =16.0, P = 31.0

no. of moles = mass / molar mass

no. of moles of K3PO4 used = 4.79 / (39.1x3 + 31 + 16x4)

= 0.02256 mol

From the equation, the mole ratio of KOH : K3PO4 = 3 :1,

meaning every 3 moles of KOH used, produces 1 mole of K3PO4.

So, using this ratio, let the no. of moles of KOH required to be y.

\frac{3}{1} =\frac{y}{0.02256} \\

y = 0.02256 x3

y = 0.0677 mol

If you don't find exactly 0.677 moles as one of the options, go for the closest one. A very slight error may occur because of taking different significant figures of atomic masses when calculating.

5 0
3 years ago
What do you think the scientific question is for the<br> boiling water experiment
Mila [183]

Answer:

Scientific Question: ... I will boil water and add a substance like salt to see if the boiling point increases.

4 0
2 years ago
How does Arizona's climate relate to the air and ocean currents?
harkovskaia [24]

Answer: In Arizona, climate change is already making deadly heat waves, droughts and wildfires across the state worse. These impacts have real costs on Arizonans' health and economy, including heat-related deaths, higher electricity bills, crop losses and more.

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https://www.edf.org/climate/costofinaction- this is where I gathered this info.  Not mine.  But I hope it helps!

6 0
2 years ago
Among the alkali earth metals, the tendency to react with other substances
tatyana61 [14]
Answer: option <span>A) increases from bottom to top within the group.

Explanation:

</span>It is a known trend that the metallic character of the elements increase from let to right and from top to bottom.

The greater the metallic character the greater the reactivity of the metal.

So, the elements of the columns 1 and 2 are the most reactive metals and among them the elements at the bottom are yet more reactive.

<span>The higher reactivity of the metals that are lower in the periodic table is attributed to the greater total number of electrons.

The greater the total number of electrons the more reactive the metals as their outermost electrons (the valence electrons which are those that react) are located further from the nucleus and therefore they are held less strongly, which makes them react more easily.</span>
5 0
2 years ago
Read 2 more answers
ASAP in middle of test will mark brainLIEST Which family in the periodic table has metals that are usually harder than other met
GREYUIT [131]
The correct answer is alkaline metals
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