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3 years ago

8. How is the crystal size different for extrusive and intrusive igneous rocks?

1 answer:

eduard3 years ago

7 0

<span>Igneous rocks which form by the crystallization of magma at a depth within the Earth are called intrusive rocks. Intrusive rocks are characterized by large crystal sizes, i.e., their visual appearance shows individual crystals interlocked together to form the rock mass. hope that helped</span>

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If 250 g of calcium chlorate decomposes into calcium chloride and oxygen, what mass of oxygen would be produced?

sineoko [7]

115.94g of O₂ are produced by 250g of Ca(ClO₃)₂

<u>Explanation:</u>

Ca(ClO₃)₂ -->CaCl₂ + 3O₂

One mole of calcium chlorate give three moles of oxygen.

Molar mass of calcium chlorate is

40+(35.5+16*3)*2 = 207g/mol

Molar mass of Oxygen = 32g

1 mole of calcium chlorate decomposes to form 3 moles of oxygen.

So,

207g of Ca(ClO₃)₂ produces 3 X 32g of O₂

250g of Ca(ClO₃)₂ will produce = $\frac{3 X 32}{207} X 250$

= 115.94g of O₂

Therefore, 115.94g of O₂ are produced by 250g of Ca(ClO₃)₂

7 0

3 years ago

12080 gallons per month into liters per hour

Alex

62 liters or 62.640 if you need decimal.

6 0

3 years ago

The rear window of a van is coated with a layer of ice at 0°C. The density of ice is 917 kg/m3, and the latent heat of fusion of

lara [203]

Answer:

thickness of ice melted = 1.242*10^{-3} m

Explanation:

power delivered = V*I = 12 * 28 = 336 Watts

heat delivered = power * time = 336 W * 300 seconds = 168000 Joules

mass of ice melted $= \frac{heat}{latent heat dffusion}$

mass of ice melted = 97200 J / 335000 J/kg = 0.5014 kg

volume of ice melted = mass / density = 0.5014 / 917 = 5.46*10{-4} m3

thickness of ice melted = volume / area = 5.46*10{-4} / 0.44 = 1.242*10^{-3} m

6 0

3 years ago

A cord is wrapped around the rim of a wheel 0.235 m in radius, and a steady pull of 43.0 N is exerted on the cord. The wheel is

MakcuM [25]

Answer:

$\alpha = 1.96\ rad/s^2$

Explanation:

given,

radius of wheel = 0.235 m

steady pull = 43 N

moment of inertia of wheel = 5.15 Kg.m²

angular acceleration = ?

torque = Force x distance

τ = F r

and torque is also known as

τ = I α

computing both the torque expression

I α = F r

$\alpha = \dfrac{Fr}{I}$

$\alpha = \dfrac{43 \times 0.235}{5.15}$

$\alpha = 1.96\ rad/s^2$

hence, the angular acceleration of wheel is equal to $\alpha = 1.96\ rad/s^2$

6 0

3 years ago

PLEASE HURRY I GIVE BRAINLIEST AND EXTRA POINTS !!!

Murljashka [212]

Answer:

Melanin is a protective pigment in skin, blocking UV radiation from damaging DNA and potentially causing skin cancer. Melanin does protect us, but this research shows it can also do us harm.

Definition:

UVA radiation causes lesions or DNA damage to melanocytes, which are the skin cells that produce the skin pigment known as melanin.

Explanation:

Melanin is a pigment that is produced by cells known as melanocytes in the skin of most animals, including humans. This pigment comes in different shades, depending on the genetic makeup of the individual. Melanin comes in two basic forms and can range from yellowish-red to dark brown. Eumelanin is the most common form of melanin and is brownish in color. The other basic form is called pheomelanin, which produces reddish-brown color that is often associated with freckles and red hair. The production of melanin in the individual is determined by several factors.

Genetically speaking, every individual on Earth has approximately the same number of melanocytes. The difference, then, in the production of melanin is affected by:

Exposure to UV radiation: Melanin is produced as a response to UV radiation in order to prevent damage to the DNA in the integument. Individuals, who are exposed to UV light, such as the sun, will produce more melanin for protection.

Genetic makeup: Different ethnicities and cultures are genetically pre-disposed to producing particular shades and amounts of melanin due to inheritance. This is, essentially, one of the primary indicators used in determining race in the human population. It is important to note that this is, and has historically been, a controversial form of human identification.

Size of melanocytes: Melanocyte size varies in different individuals and may lead to a difference in the amount of melanin produced per cell.

Disease conditions: Several diseases may affect melanin production, including albinism, a genetic inability to produce melanin, and vitiligo, a progressive loss of melanocytes.

7 0

3 years ago