1. Describe a human feature that has at least two traits.

What type of chemical reaction involves 2 or more elements combining to form one?

Vikki [24]

Hey there!

I believe the answer is Combination (or Synthesis) Reaction.

6 0

3 years ago

4. A galvanic cell is formed when two metals are immersed in solu- tions differing in concentration 1 when two different metals

Vanyuwa [196]

A galvanic cell is formed when two metals are immersed in solutions differing in concentration, when two different metals are immersed.

<h3>What is a Galvanic cell ?</h3>

In order to provide a pathway for the flow of electrons along that wire, the galvanic cell makes use of the ability to split the flow of electrons during the oxidation and reduction processes.
It forces a half-reaction and connects each to the other with a wire.
A galvanic cell is an electrochemical device that converts chemical redox reaction energy into electrical energy.
Electrically, it has a potential of 1.1 V. Oxidation takes place at the anode, which is a negative plate in galvanic cells. It is a positive plate where the reduction happens.
An electrochemical device called a galvanic cell transforms chemical energy's free energy into electrical energy. A photogalvanic cell produces species that are photochemically reactive.

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5 0

2 years ago

Convert 6.35 grams of aluminum sulfate to moles

vampirchik [111]

Answer:

There are 0.0186 moles of formula units in 6.35 grams of aluminum sulfate $\rm Al_2(SO_4)_3$ .

Explanation:

What's the empirical formula of aluminum sulfate?

Sulfate is an anion with a charge of -2 per ion. When sulfate ions are bonded to metals, the compound is likely ionic.

Aluminum is a group III metal. Its ions tend to carry a charge of +3 per ion.

The empirical formula of an ionic compound shall balance the charge on ions with as few ions as possible.

The least common multiple of 2 and 3 is 6. That is:

Three sulfate ions $\rm {SO_4}^{2-}$ will give a charge of -6.
Two aluminum ions $\rm Al^{3+}$ will give a charge of +6.

Pairing three $\rm {SO_4}^{2-}$ ions with two $\rm Al^{3+}$ will balance the charge. Hence the empirical formula: $\rm Al_2(SO_4)_3$ .

What's the mass of one mole of aluminum sulfate? In other words, what's the formula mass of $\rm Al_2(SO_4)_3$ ?

Refer to a modern periodic table for relative atomic mass data:

Al: 26.982;
S: 32.06;
O: 15.999.

There are

two Al,
three S, and
twelve O

in one formula unit of $\rm Al_2(SO_4)_3$ .

Hence the formula mass of $\rm Al_2(SO_4)_3$ :

$\underbrace{2\times 26.982}_{\rm Al} + \underbrace{3\times 32.06}_{\rm S} + \underbrace{12\times 15.999}_{\rm O} = \rm 342.132\;g\cdot mol^{-1}$ .

How many moles of formula units in 6.35 grams of $\rm Al_2(SO_4)_3$ ?

$\displaystyle n = \frac{m}{M} = \rm \frac{6.35\;g}{342.132\;g\cdot mol^{-1}} = 0.0186\;mol$ .

8 0

4 years ago

ASAP

alexgriva [62]

Answer: C. Some are metals and some are nonmetals.

Explanation:

5 0

4 years ago

Read 2 more answers

Lithium salts are often much less soluble in water than the corresponding salts of other alkali metals. For example, at 18°C, th

serious [3.7K]

Lithium is one of element of group 1 of periodic table.

Lithium has the smallest radius than as compared to the other elements, thus the density of the alkali metal is also less.

Lithium when added to water it floats, because of lower density. It eventually fizzes and becomes smaller.

The reaction on lithium and water is:

2Li + 2H₂O --> 2LiOH + H₂ (g)

The hydrogen gas which is liberated is highly flammable.

Thus, lithium salts are insoluble in water.

Density is defined as the mass of a substance per unit volume.

Density = Mass ÷ Volume.

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8 0

2 years ago