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3 years ago

Wegner's theory that the continents slowly moved over Earth's surface became known as _________ .

1 answer:

7 0

Wedners idea that the continents slowly moved over Earth's surface became known as continental drift. According to Wegener, the continents drifted together to form the supercontinent Pangaea (pan jee uh).Pangaea means “all lands.” According toWegener, Pangaea existed about 300 million years ago.

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The half life of thallium 201 is 21.5 hours. We have 98 g of thallium 201 how many grams will be left after 10 half-lives?

Lynna [10]

Answer:

0.0957 g

Explanation:

Half life is the time required by the substance to decay to half of its initial mass. Most often exponential decays of radioactive substances are explained by half life. Half life remains constant throughout the life of decay.

It is given as;

N(t) = N₀ (1/2)^t/t1/2

Where;

N(t) = Amount remaining after certain time

N₀ = The starting initial amount

t1/2 = Half life of given substance

Putting values,

N(t) = 98 × (1/2)^215/21.5

N(t) = 0.0957 g

8 0

3 years ago

Calculate the amount of miles of HCI is needed to make 500.0 mL of a 0.200M solution

frozen [14]

Answer: 0.4 moles

Explanation:

Given that:

Amount of moles of HCI = Z (let unknown value be Z)

Volume of HCl = 500.0 mL

Convert 500.0 mL to liters

If 1000ml = 1L

500.0 mL = (500.0 mL/1000mL) = 0.5L

Molarity of HCl solution = 0.200M

Recall that molarity of a solution is obtained by dividing the amount of moles by volume in liters

i.e Molarity = Amount in moles/volume

0.200M = Z x 0.5L

Z = 0.200M / 0.5L

Z = 0.4 moles

Thus, 0.4 moles of HCl is needed to make the solution

3 0

3 years ago

Which of the following is NOT a reason why chemical bonds are important? *

KengaRu [80]

Answer:

the answer would be B :)

3 0

4 years ago

Define cohesion. Describe how the cohesive property of water is useful for living organisms.

kolbaska11 [484]

Answer:cohesion is the action or fact of forming a united whole.

Water is very cohesive in that it "sticks" to itself. Cohesion is what allows a water droplet to form, for example. When water molecules surround one another, they settle toward a low energy state. ... Adhesion and cohesion are water properties that affect living and non-living things on earth through water molecules.

Explanation:

8 0

4 years ago

Read 2 more answers

How many variance electrons in Aluminium? Is it 3

ololo11 [35]

Answer:

Question #1: How many valence electrons in Aluminum? Is it 3?

------> Yes, aluminum has 3 valence electrons.

Question #2: How many valence electron in Sulfur? Is it 6?

-----> Yes, sulfur has 6 valence electrons.

Question #3: What type of bonds do these form? Is it covalent or ionic?

-----> Covalent bonds generally occur between 2 nonmetals. Ionic bonds generally occur between a metal and a nonmetal. Aluminum is a metal and sulfur is a nonmetal. Therefore, an ionic bond would form.

Question #4: How many aluminum atoms will you need? 1, 2, or 3?

-----> Atoms become ions in order to achieve a full octet of valence electrons (8 valence electrons). Since aluminum atoms have 3 valence electrons, they are likely to donate these electrons during ionization. As such, aluminum ions look like this: Al³⁺. Since sulfur atoms have 6 valence electrons, they are likely to receive 2 electrons during ionization. As such, sulfur ions look like this: S²⁻.

-----> The ionic compound formed will be Al₂S₃. There would be 2 aluminum atoms because this arrangement allows for the ionic compound to have an overall charge of 0.

Aluminum = +3

Sulfur = -2

+3 + 3 + (-2) + (-2) + (-2) = 0

Question #5: How many sulfur atoms will you need? 1, 2, or 3?

-----> As stated previously the resulting ionic compound is Al₂S₃. There would be 3 sulfur atoms to balance the charges.

6 0

2 years ago