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3 years ago

The continents may not have drifted slowly into their present positions. True False

Chemistry

2 answers:

12345 [234]3 years ago

7 0

True, look up pangea

vichka [17]3 years ago

6 0

Answer:

FALSE

Explanation:

According to the continental drift theory, the continents moved from one place to another with respect to the poles. Although many pieces of evidence had been contributed by Mr. Alfred Wegener, the main mechanism behind this was not able to explain.

Later on, this theory modified into a new one, commonly known as the plate tectonic theory that explains that the continents move over the layer of the asthenosphere due to the formation of convection current in the mantle. This is possible because of the heat radiated from the interior of the earth.

Thus, it was concluded that initially the earth was comprised of a single super-continent named 'Pangea', which got split into Laurasia and Gondwanaland due to the plate tectonic movement. This process further continued at a much slower rate which resulted in the present-day location of the continents.

Thus, the above-given statement is False.

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Laura has 3 beakers. Each contain 200cm3 of colourless liquid. Describe how Laura could determine which beakers contain pure wat

vova2212 [387]

Answer:

Laura can look for a transparent and translucent liquid and hence determine which beaker has water and which has solution

Explanation:

Pure water is a compound that is transparent in color. However, a solution is a liquid mixture comprising of a solvent or a solute. The atoms of solute occupy space between the atoms of solvent and hence are said to dissolve in it. Water can be a solvent.

Thus, if the beaker has a transparent liquid in it, then it would be pure water while a beaker having a translucent liquid, then it would be a solution

6 0

3 years ago

1. Describe the evidence that stress plays a role in the development of schizophrenia.

valentina_108 [34]

Answer:

Research shows that patients with schizophrenia are more affected by stress physically as well as emotionally, for instance they show different changes in heart rate under stress and a greater overall risk of cardiovascular disease.

Explanation:

8 0

3 years ago

Chemistry student needs 15.0 g of painting for an experiment by consulting the CRC handbook of chemistry and physiology the stud

nalin [4]

Answer:

v = 23.96 cm³

Explanation:

Given data:

Mass = 15.0 g

Density = 0.626 g/cm³

Volume = ?

Solution:

Formula:

D=m/v

D= density

m=mass

V=volume

Now we will put the values in formula:

d = m/v

v = m/d

v = 15 g / 0.626 g/cm³

v = 23.96 cm³

8 0

2 years ago

QUESTION 1

Svetlanka [38]

Answer:

Explanation:

Because nothing is left at the end of the reaction.

3 0

2 years ago

A 100.0 g sample of aluminum released 1680 calories when cooled from 100.0c to 20.0 c what is the specific heat of the metal

vovangra [49]

Answer:

The specific heat of aluminium is 0.8792 J/g °C or 0.21 Cal/g °C

Explanation:

Step 1 : Write formule of specific heat

Q=mcΔT

with Q = heat transfer (J)

with m = mass of the substance

with c = specific heat ⇒ depends on material and phase ( J/g °C)

with ΔT = Change in temperature

For this case :

Q = 1680 Calories = 7033.824 J ( 1 calorie = 4.1868 J)

m = 100.0g

c= has to be determined

ΔT = 100 - 20 = 80°C

<u>Step 2: Calculating specific heat</u>

⇒ via the formule Q=mcΔT

7033.824 J = 100g * c * 80

7033.824 = 8000 *c

c = 7033.824 /8000

c = 0,879228 J/g °C

or 0.21 Cal / g°C

The specific heat of aluminium is 0.8792 J/g °C or 0.21 Cal/g °C

6 0

2 years ago