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3 years ago

6. The variable that a scientist changes on purpose to test a hypothesis is the

Chemistry

1 answer:

nirvana33 [79]3 years ago

8 0

Answer:

the amount of water and the growth

Explanation:

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How many moles are in 281 g of Ca(OH)2?

Natasha_Volkova [10]

Answer:

3.79 moles

Explanation:

To convert moles to gams of a substance we need to find the molar mass of the substance. For Ca(OH)₂ th molar mass is:

1Ca = 40.08g/mol

2O = 2*16g/mol = 32g/mol

2H = 2*1.01g/mol = 2.02g/mol

The molar mass is:

40.08g/mol + 32g/mol + 2.02g/mol = <em>74.1g/mol</em>

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And moles are:

281g * (1mol / 74.1g) =

<h3>3.79 moles</h3>

5 0

2 years ago

If you were to place the black probe of the voltmeter on the silver electrode and the red probe on the Zinc electrode: What volt

podryga [215]

Answer:

When the red test lead is positive (+) and the black test lead negative (-), the meter will register voltage in the normal direction.

Explanation

5 0

2 years ago

If you take a 15.0-mL portion of the stock solution and dilute it to a total volume of 0.600 L , what will be the concentration

alexira [117]

$15 \div .6$

6 0

3 years ago

On the periodic table, the majority of elements are classified as

Roman55 [17]

<span>On the periodic table, the majority of elements are classified as "Metals"

In short, Your Answer would be Option A

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8 0

2 years ago

Read 2 more answers

How many moles of calcium chloride would react with 5. 99 moles of aluminum oxide?

slega [8]

There are 17.97 moles of calcium chloride would react with 5. 99 moles of aluminum oxide .

The balanced chemical equation between reaction between calcium chloride and aluminum oxide is given as,

$3CaCl_{2} (aq)+Al_{2} O_{3} (s)$ → $3CaO_{2} (s)+2Al Cl_{3} (aq)$

The molar ratio of above reaction is 3:1

It means 3 moles of calcium chloride is require to react one mole of aluminum oxide.

The number of moles of calcium chloride requires to react with 5. 99 moles of aluminum oxide = 3 × 5. 99 = 17.97 moles

The equation in which number of atoms of elements in reactant side is equal to the number of atoms of elements in product side is called balanced chemical equation .

learn more about calcium chloride

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6 0

1 year ago