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3 years ago

What is igneous rock made of

2 answers:

6 0

Igneous rock forms from magma, which is molten rock, cools on the surface of the Earth.
So they are made of magma which has cooled.

Natasha_Volkova [10]3 years ago

5 0

A good example of intrusive igneous rock is granite . Extrusive igneous rocks form when the magma or molten rock pours out onto the earth's surface or erupts at the earth's surface from a volcano . Extrusive rocks are also called volcanic rocks.Basalt , formed from hardened lava , is the most common extrusive rock

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My school question was Describe what the electrons do in each of the following bond types: (explain if electrons are transferred

sleet_krkn [62]

Answer:

Ionic Bonds: Electrons are transferred b/c one atom "steals" electrons from another. The attraction between the resulting cation/anion is known as an ionic bond.

Polar Covalent Bonds: Electrons are shared unequally. This is in the case that the molecule is not symmetric or if the central atom has a lone (electron) pair.

Nonpolar Covalent Bonds: Electrons are shared equally. This is in the case that the molecule is symmetric and the central atom has no lone pairs.

6 0

3 years ago

Scientists have cited gas emission as contributing to global [blank] , which is a general increase in temperatures worldwide.

yanalaym [24]

Answer:

Warming

Explanation: Greenhose gases (CO2, CH4, etc.) trap heat in Earth's atmosphere since they absorb wavelenghts of light associated with heat.

5 0

3 years ago

the osmotic pressure ofa solution containing 5.87 mg of an unknown protein per 10ml of solution is 2.45 torr at 25 degree celsiu

Neko [114]

Answer: The molar mass of the unknown protein is $4.45\times 10^9g/mol$

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

$\pi=iMRT$

Or,

$\pi=i\times \frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}\times RT$

where,

$\pi$ = osmotic pressure of the solution = 2.45 torr

i = Van't hoff factor = 1 (for non-electrolytes)

Mass of solute (protein) = 5.87 mg = 5870 g (Conversion factor: 1 g = 1000 mg)

Volume of solution = 10 mL

R = Gas constant = $62.364\text{ L.torr }mol^{-1}K^{-1}$

T = temperature of the solution = $25^oC=[273+25]=298K$

Putting values in above equation, we get:

$2.45torr=1\times \frac{5870\times 1000}{\text{Molar mass of protein}\times 10}\times 62.364\text{ L.torr}mol^{-1}K^{-1}\times 298K\\\\\text{molar mass of protein}=4.45\times 10^9g/mol$

Hence, the molar mass of the protein is $4.45\times 10^9g/mol$

4 0

3 years ago

1. Write chemical reaction of burning of magnesium

shtirl [24]

Answer:

1.Mg+O2.......MgO2

Explanation:

2.Very reactive towards halogens and reacts with water at room temperature. 3, Magnesium oxide is a simple basic oxide. 4.It will react with water to form magnesium hydroxide which is a base turning red litmus to blue 5.should be white. hope it helped. I help people although when I post a question it is left unanswered and then gets answers after two days when I don't really need it

4 0

3 years ago

A student observed an example in which all of the offspring of an organism have the same

Sphinxa [80]

The answer is C I believe because it makes sense

6 0

3 years ago