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rosijanka [135]
2 years ago
7

Sidney is experimenting with two charged objects. She holds the objects close to each other, but she makes sure they never touch

.
Which is the only hypothesis about the two objects that Sidney would find to be true?
Chemistry
1 answer:
Fed [463]2 years ago
5 0

Answer:

they are opisitly charged

Explanation:

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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 are some examples of chemical weathering(select all that apply):
ASHA 777 [7]

Answer:

reactions between air, water and minerals, chemicals in rain water

4 0
2 years ago
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.What threatens the newly hatched chicks?
marysya [2.9K]

Answer:

rats. that's all i know of Just about everything except the mother hen if they are natural hatch. Even when you incubate them there are threats. The healthy chicks will mob the weak ones, the older chicks (even by a day) will pick on the younger ones. Temperature extremes will threaten them as they need warm, humid conditions with gradual drops in surrounding temps in the brooder box. Early disease is sometimes a problem and all chicks should be started on medicated chick feed for the first few weeks to prevent several digestive diseases. Even the water dispenser can be a threat as newly hatched chicks will immerse themselves in an open water container so care should be taken to supply water in a self feeding covered dish.

Explanation:

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Express the chemical reaction between hydrogen and oxygen elements for the formation of water in word equation and chemical equa
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Answer:

Two moles of hydrogen gas combine with one mole of oxygen gas to produce two moles of water.

2H_{2} O + O_{2}  -> 2H_{2}O

Explanation:

This is the required amount of each element to synthesize water. The equation has been balanced using coefficients.

7 0
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In the Lewis structure of the iodate ion, IO3 – , that satisfies the octet rule, the formal charge on the central iodine atom is
vitfil [10]

Answer:

- 1 is the correct option

Explanation:

In determining the oxidation state or formal charge on element in an ionic specie, the whole ion need to be equated to the value of charge on the ion.

For example in this case, the charge on the ion is -3. Thus; representing iodine with X and putting -2 for the oxidation state of O (oxygen)

X + -2 = -3 (adding 2 to both side)

X = -3 + 2

X = - 1

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