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3 years ago

Which plate is the South American plate? Web D O A D B. A C. B В D C

Chemistry

1 answer:

Nimfa-mama [501]3 years ago

5 0

Answer:

C. B

Explanation:

The correct plate is showing n the green color that is of South America and is a major tectonic plate. The plate belongs to the south American continent and forms the southernmost part of the mid-Atlantic ridge.

According to the plate movement, it's still moving to the west away from the Atlantic ridges due to the seafloor spreading. Has The plate has an approx area of 43,600,000 km square.

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Draw the Lewis structure, including unshared pairs, of the following molecules. Carbon has four bonds in the compound.

Galina-37 [17]

Explanation:

Refer to attachment.

Propane
Methanol (methyl alcohol)
methyl fluoride
ethyl fluoride

6 0

3 years ago

The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0 × 10−17 J of energy to trigg

AveGali [126]

Number of photons can be calculated by dividing the needed energy by the energy per photon.

The minimum energy needed is given as 2 x 10^-17 joules
Energy per photon = hc / lambda where h is planck's constant, c is the speed of light and lambda is the wavelength
Energy per photon = (<span>6.626 x 10^-34 x 3 x 10^8) / (475 x 10^-9)
= 4.18 x 10^-19 J

number of photons = (2 x 10^-17) / (4.18 x 10^-19)
= 47.79 photons which is approximately 48 photons</span>

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3 years ago

Which is the most important question for deciding if a chemical reaction has occurred?

777dan777 [17]

Answer:

all these are physical properties except release of heat so it's probably heat energy given off

7 0

3 years ago

Read 2 more answers

The metallic bond is the attraction between _____.

belka [17]

The answer is: a metal cation and the shared electrons that surround it.

Metallic bond is a type of chemical bond.

Metallic bond is formed between electrons and positively charged metal ions.

Metallic radius is defined as one-half of the distance between the two adjacent metal ions.

Metallic bond increace electrical and thermal conductivity.

Metals conduct heat, because when free moving electrons gain energy (heat) they vibrate more quickly and can move around.

3 0

3 years ago

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Describe in detail how to prepare 500.0 mL of a 2.5 M calcium chloride solution. Calcium chloride is purchased as a solid. TO pi

antoniya [11.8K]

Answer:

In a volumetric flask of marking 500.0 mL add 138.75 grams of calcium chloride and add small amount of water to dissolve solute completely. After the solute gets completely soluble add more water up till the mark of 500 ml.

Explanation:

Concentration of calcium chloride = 2.5 M

Volume of the solution = 500.0 ml = 0.5000 L

Moles of calcium chloride = n

$c=\frac{n}{V(L)}$

n = moles of solute

c = concentration of solution

V = volume of the solution in L

$2.5 M=\frac{n}{0.5000 L}$

$n=2.5 M\times 0.5000 L = 1.2500 mol$

$n=\frac{\text{Mass of calcium chloride}}{\text{Molar mass of calcium chloride}}$

$1.2500 mol=\frac{\text{Mass of calcium chloride}}{111 g/mol}$

Mass of calcium chloride = 111 g/mol × 1.2500 mol = 138.75 g

In a volumetric flask of marking 500.0 mL add 138.75 grams of calcium chloride and add small amount of water to dissolve solute completely. After the the solute gets completely soluble add more water up till the mark of 500 ml.

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3 years ago