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3 years ago

Convection is a mode of heat transfer for which types of objects?

Chemistry

2 answers:

Goshia [24]3 years ago

3 0

Liquids and gases :)))))

cestrela7 [59]3 years ago

3 0

Answer:

liquids and gases

Explanation:

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How does the arrangement of atoms in a crystalline substance differ from the arrangement in a noncrystalline (amorphous) substan

Lady bird [3.3K]

Answer:

4. Atoms in crystals are in an ordered array. In amorphous materials, they are randomly distributed.

Explanation:

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3 years ago

What impact did political parties in Africa have on the African desire for independence?

Anvisha [2.4K]

They were important to help unify the Africans in their independence. How exactly were these political parties improved? Well, they were better organized, more unified in demands, had broad support, unwilling to compromise, willing to use any means necessary.

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3 years ago

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Which is true about each element in a period or horizontal row of the periodic table?

Ber [7]

The true about element in period or horizontal row of periodic table is

Each element has one more outer electron than the element before it. (answer B)

<u><em> Explanation</em></u>

In periodic table there are four horizontal rows(periods) that is period 1,2,3 and 4.

Across the period each element has one more electron than element before it.

For example Na and Mg which are in periodic 3.

Na has 2.8.1 or [Ne] 3s¹ electron configuration while Mg has 2.8.2 or [Ne] 3S² electron configuration.

Since Mg has 2 outer electrons while Na has 1 outer electron, Mg has more electron than Na.

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3 years ago

A gas is formed in the reaction shown below. The gas laws can help determine the volume of gas produced.

Tasya [4]

Considering the definition of molar mass, the number of moles of Zn reactant used is 2 moles.

<h3>Definition of molar mass</h3>

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

<h3>Number of moles of Zn used</h3>

The balanced reaction is:

Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)

Assume that 130.8 grams of Zn was used in this reaction.

To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used.

So to determine the number of moles used you know that the molar mass of Zn is 65.37 $\frac{g}{moles}$ . Then:

$molar mass=\frac{mass}{number of moles}$

$65.37\frac{g}{moles} =\frac{130.8 g}{number of moles}$

Solving:

number of moles× 65.37 $\frac{g}{moles}$ = 130.8 g

$number of moles=\frac{130.8 g}{65.37\frac{g}{moles}}$

<u><em>number of moles≅ 2 moles</em></u>

Finally, the number of moles of Zn reactant used is 2 moles.

Learn more about molar mass:

<u>brainly.com/question/5216907</u>

<u>brainly.com/question/11209783</u>

<u>brainly.com/question/7132033</u>

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2 years ago

Which group in the periodic table contains the three elements with the highest

Andreas93 [3]

Answer:

Group 12

Explanation:

Group 12 is also called a transition metal group. This group in the periodic table lies in between the groups or tables. These metals are classified as the transition metal in the table.

These metals are found from the group number 3 to 12. In the periodic table, These transition elements are ductile and malleable. These metal conduct heat and electricity.

These elements are generally called dense and less to react to the alkaline metal. Iron, copper-silver, gold is the most important transition metal.

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3 years ago