CHEMISTRY HIGH SCHOOL

Why do you think Robert Hooke used the term "cell" to describe what he saw

Answers

Answer 1
Answer:

Answer:

prison cells

Explanation:

Robert hook thought of prison cells when he first was the cells
Answer 2
Answer:

Answer:

Robert Hooke called what he saw a cell because it reminded him of the cells in a monastery.

I hope this helps you

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How do the products and reactants of a chemical change compare? The mass of the products is greater than the mass of the reactants because energy is absorbed by the reaction.

The mass of the products equals the mass of the reactants because energy is not absorbed or given off by the reaction.

The mass of the products is less than the mass of the reactants because energy is given off by the reaction.

The mass of the products equals the mass of the reactants because the same atoms are present throughout the reaction

Answers

The right answer for the question that is being asked and shown above is that: "The mass of the products equals the mass of the reactants because the same atoms are present throughout the reaction." -- The products and reactants of a chemical change should be compared

Which of the following units is a derived unit?
Second
Meter
Density
Ampere

Answers

Answer : The correct option is, Density

Explanation :

S.I : It is known as the international System of Units. It is defined as a scientific method to express the magnitude of the several basics units.

There are seven basic units in the system from which the other units are derived.

The seven base unit are, meter for length, kilogram for mass, second for time, ampere for current, kelvin for temperature, mole for amount of substance and candela for intensity.

As per question, second, meter and ampere are the S.I units but the density is the derived unit.

Density : It is defined as the mass of a substance contained per unit volume.

The unit of mass is kilogram (kg) and the unit of volume is m^3. So, the unit of density will be:

Formula used :

Density=(Mass)/(Volume)=(kg)/(m^3)=kg/m^3

The unit of density is, kg/m^3

Hence, the derived unit is density.
Density because you have to use volume and mass to get it. (Density=mass/volume)

How are gamma rays made? Also, how are they important?

Answers

How are they made-
Gamma rays are given off by stars, and by some radioactive substances.
They are extremely high frequency waves, and carry a large amount of energy.USES-Because Gamma rays can kill living cells, they are used to kill cancer cells without having to resort to difficult surgery.This is called "Radiotherapy", and works because healthy cells can repair themselves fairly well when damaged by gamma rays - but cancer cells can't. Getting the dose right is very important!There's also targeted radiotherapy, where a radioactive substance is used to kill cancer cells - but it's a substance that'll be taken up by a specific part of the body, so the rest of the body only gets a low dose. An example would be using radioactive iodine to treat cancer in the thyroid gland.
Gamma rays are generated by radioactive atoms and in nuclear explosions. gamma rays are used to kill cancerous cells which is why it is used in medicine.

What property of an atom determines its general reactivity?

Answers

The Chemical reactivity of metals varies with your eletropositividade, so the more eletropositivo is the most reactive element is metal. The most reactive metals are those that have great tendency to lose electrons and  therefore form positive ions with more ease.

hope this helps!

How many (s) sublevels are present in calcium atom (Ca)?

Answers

Answer:

nineteen atoms

Explanation:

nineteen atoms

How much CaCl2, in grams, is needed to make 2.0 L of a 3.5M solution?

Answers

find the number of moles: 2•3.5=7 moles

and do dimensional analysis. to convert moles of solution to moles of cacl2 and moles of cacl2 to grams of cacl2 (molar mass)
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Gaseous methane (CH₄) reacts with gaseous oxygen gas (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O) If 0.391 g of carbon dioxide is produced from the reaction of 0.16 g of methane and 0.84 g of oxygen gas, calculate the percent yield of carbon dioxide.