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2 years ago

6

Which of these is an indication that a chemical reaction has occurred? A.Melting of a substance B.Boiling of a substance C.Forma

tion of a gas D.Freezing of a substance

1 answer:

podryga [215]2 years ago

7 0

The answer is formation of gas because melting, boiling, and freezing are only property changes

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Definition empirical evidence

Mkey [24]

Answer:

Empirical evidence for a proposition is evidence, i.e. what supports or counters this proposition, that is constituted by or accessible to sense experience or experimental procedure. Empirical evidence is of central importance to the sciences and plays a role in various other fields, like epistemology and law

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2 years ago

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If you created a food chain using the following items. which item would follow the corn?

liq [111]

1. chicken
2. corn
3. human
4. A food chain shows the flow of energy from one item to the next but a food web does not.
a food chain is a small piece of a larger food web. Is true

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3 years ago

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In a student experiment, the empirical formula of a copper halide was found by adding aluminum metal to an aqueous solution of t

Radda [10]

<u>Answer:</u> The empirical formula for the given compound is $CuCl_3$

<u>Explanation:</u>

We are given:

Mass of copper chloride in 1 L or 1000 mL of solution = 42.62 grams

<u>Taking Trial A:</u>

Volume of solution = 49.6 mL

Applying unitary method:

In 1000 mL of solution, the mass of copper chloride present is 42.62 grams

So, in 49.6 mL of solution, the mass of copper chloride will be = $\frac{42.62}{1000}\times 49.6=2.114g$

We are given:

Mass of filter paper = 0.908 g

Mass of filter paper + copper = 1.694 g

Mass of copper = [1.694 - 0.908] g = 0.786 g

Mass of chlorine in the sample = [2.114 - 0.786]g = 1.328 g

To formulate the empirical formula, we need to follow some steps:

<u>Step 1:</u> Converting the given masses into moles.

Moles of Copper = $\frac{\text{Given mass of Copper}}{\text{Molar mass of Copper}}=\frac{0.786g}{63.5g/mole}=0.0124moles$

Moles of Chlorine = $\frac{\text{Given mass of Chlorine}}{\text{Molar mass of Chlorine}}=\frac{1.328g}{35.5g/mole}=0.0374moles$

<u>Step 2:</u> Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.0124 moles.

For Copper = $\frac{0.0124}{0.0124}=1$

For Chlorine = $\frac{0.0374}{0.0124}=3.02\approx 3$

<u>Step 3:</u> Taking the mole ratio as their subscripts.

The ratio of Cu : Cl = 1 : 3

Hence, the empirical formula for the given compound is $CuCl_3$

3 0

2 years ago

Determine the molecular geometry about the left carbon atom in ch3co2ch3.

Elanso [62]

Molecular geometry about the left carbon atom in CH₃CO₂CH₃ is tetrahedral.

The geometry around left carbon that is CH₃ is tetrahedral.

As the hybridization around left carbon is sp³ that shows its geometry should be tetrahedral and as there are 4 ligands around carbon and there is no lone pair present so the geometry is tetrahedral. So, the molecular geometry about the left carbon atom in CH₃CO₂CH₃ is tetrahedral.

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2 years ago

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Hydrochloric acid reacts with calcium to form hydrogen and calcium chloride. If 100 grams of hydrochloric acid reacts with 100 g

LenaWriter [7]

Answer is hydrochloric acid

Hope this helps!

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2 years ago

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