CHEMISTRY
MIDDLE SCHOOL

Answer: - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - -

➷ Fluorine. Carbon needs to gain 4 electrons to get a full outer shell whereas fluorine only needs to gain 1, making it much more reactive.

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MIDDLE SCHOOL

To successfully live in a tide pool, organisms must have adaptations that allow it to:

Survive in deep waters and have lungs so it can breathe because of the tide waves.

MIDDLE SCHOOL

What is the definition of economic value

Answer:

Economic value can be described as a measure of the benefit from a good or service to an economic agent. It is typically measured in units of currency. Another interpretation is that economic value represents the maximum amount of money an agent is willing and able to pay for a good or service.

Explanation:

HIGH SCHOOL

Properties of charcoal

It's a black residue consisting of carbon and any remaining ash that's obtained by removing water from animal substances (hope that helped)

COLLEGE

The age of fossils can sometimes be determined by radiometric dating, which is based on the constant rate of decay of radioactive isotopes. the time required for half of a radioactive isotope to decay is called the half-life of that isotope. for example, the isotope carbon-14 has a half-life of 5,730 years. suppose it is determined that a fossilized leaf contains 12.5% of the carbon-14 that was present when the fossil formed. how old is the fossil? express your answer numerically.

The age of the fossil given the present amount of Carbon-14 is given in the equation,

A(t) = A(o)(0.5)^t/h

where A(t) is the current amount, A(o) is the initial amount, t is time and h is the half-life. Substituting the known values to the equation,

A(t) / A(o) = 0.125 = (0.5)^(t/5730)

The value of t from the equation is 17190.

Thus, the age of the fossil is mostly likely to be 17190 years old.

A(t) = A(o)(0.5)^t/h

where A(t) is the current amount, A(o) is the initial amount, t is time and h is the half-life. Substituting the known values to the equation,

A(t) / A(o) = 0.125 = (0.5)^(t/5730)

The value of t from the equation is 17190.

Thus, the age of the fossil is mostly likely to be 17190 years old.

HIGH SCHOOL

An isotope of cesium has 55 protons and 78 neutrons. What is the mass number of this isotope?

The only stable caesium isotope is 133Cs, with 78 neutrons.

Hope this answers your Q

HIGH SCHOOL

The following question appears on a quiz: ""You fill a tank with gas at 60Â°C to 100 kPa and seal it. You decrease the temperature to 10Â°C but keep the volume constant. What happens to the pressure?

Answer: The final pressure will decrease ad the value is 85 kPa

Explanation:

To calculate the final pressure of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

where,

are the initial pressure and temperature of the gas.

are the final pressure and temperature of the gas.

We are given:

Putting values in above equation, we get:

Hence, the final pressure will decrease ad the value is 85 kPa

COLLEGE

`Silver salts have antimicrobial properties--they can kill bacteria by interfering with certain proteins. Silver nitrate used to be given in drop form to newborns to prevent them from contracting gonorrhea from infected mothers. How many oxygen atoms would be in 2.0 moles of silver nitrate?

Answer:

3.6 × 10²⁴ atoms of O

Explanation:

Let's consider the molecular formula of silver nitrate: AgNO₃.

We can establish the following relations:

- 1 mol of AgNO₃ has 6.02 × 10²³ molecules of AgNO₃ (Avogadro's number).
- 1 molecule of AgNO₃ has 3 atoms of oxygen.

The atoms of oxygen in 2.0 moles of silver nitrate are:

HIGH SCHOOL

Sublimation can occur because solids and liquids have what in common?

They both have a vapor pressure.

COLLEGE

What is the difference between mitosis and meiosis

In mitosis, cells are divided to make 2 cells, while in meiosis, cells are divided to make 4 cells.

Meiosis has two rounds of genetic separation while Mitosis only has one.

Hope this helps:)

Hope this helps:)