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3 years ago

14

Plante si animale pe cale de disparitie din tara noastra

1 answer:

Leno4ka [110]3 years ago

4 0

Oui, les animaux meurent plus souvent à cause des humains

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Ancient Greek civilization was located on one contiguous body of land, north of the Aegean Sea.

lyudmila [28]

This is false!

An important part of the Greek civilization was the island of Crete, which is not contiguous with the rest of the Peloponnese. Additionally there were other important sites of the Greek culture on other Islands in the Aegean Sea and in Turkey - we still find their ruins and remains today.

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3 years ago

Three disadvantages of outsourcing

FinnZ [79.3K]

<span>Risk of exposing confidential data:
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2 years ago

11. The doubling time is the time it takes for the

Vanyuwa [196]

It’s number 3 or C that is you’re answer

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2 years ago

1) Calculate mean yearly temperature using the data in the chart below. Give the answer to two decimal places.

Tatiana [17]

Answer:

(a) Mean yearly temperature = 10.58

(b) $July = 24^\circ C$

Explanation:

Given:

The attached chart

Solving (a): The mean yearly temperature.

This is calculated as:

$\bar x = \frac{\sum x}{n}$

$\bar x = \frac{-5 + 2 + 6 + 10+15 + 22+24+21+17+12+6-3}{12}$

$\bar x = \frac{127}{12}$

$\bar x = 10.58$

Solving (b): The mean July temperature.

From the chart:

$July = 24^\circ C$

6 0

2 years ago

What is the Wt% of SiO2 in augite?<br><br> (Ca, Fe, Mg, Na)(Mg,Fe,Al) (Si,Al)2 O6

vaieri [72.5K]

Answer:

The weight% of $SiO_2$ in augite is 13.16 %.

Explanation:

Atomic mass of calcium = 40 g/mol

Atomic mass of iron = 56 g/mol

Atomic mass of magnesium = 24 g/mol

Atomic mass of sodium = 23 g/mol

Atomic mass of aluminum = 27 g/mol

Atomic mass of silicon = 28 g/mol

Atomic mass of oxygen = 16 g/mol

Mass of $SiO_2=28 g/mol+ 2\time 16 g/mol=60 g/mol$

Molar mass of the augite $(Ca, Fe, Mg, Na)(Mg,Fe,Al)(Si,Al)_2 O_6$ = M

$M=40 g/mol+2\times 56 g/mol+2\times 24 g/mol+23 g/mol+3\times 27 g/mol+2\times 28 g/mol+6\times 16 g/mol=456 g/mol$

Weight% of $SiO_2$ in augite:

$w\%=\frac{60 g/mol}{456 g/mol}\times 100=13.16\%$

3 0

3 years ago