CHEMISTRY MIDDLE SCHOOL

What are all structures that make up the immune system?

Answers

Answer 1
Answer: The bone marrow is the one which makes the immune system.

Related Questions

Which of the following is an example of a chemical change? A. melting solid gold B. burning hydrogen gas C. breaking a sheet of glass D. dissolving sugar in water
What kind of changes cause iron to rust ?
Which of the following is the best name for a compound made from calcium and bromine? (CaBr2) calcium bromide calcium dibromide monocalcium dibromide calcium bromine II
Explain difference in appearance between a pure substance and a mixture.
Plants don't move around, so why do they need energy?

Why does methane have a low boiling pint?

Answers

Methane is an alkane. Alkanes are composed of a number of carbons (denoted by the prefix on the chemical name, e.g. meth-ane, eth-ane, prop-ane, but-ane...) which are saturated with hydrogen atoms (the largest number of hydrogens possible are bound to them). Methane has one carbon, which is saturated with 4 hydrogen atoms - this means that the chemical formula is CH4 (where the 4 should be subscript, but I can't work it out in this text field).

The boiling point depends on the strength of the intermolecular forces between each molecule - as the length of the molecule increases, so does the force of attraction between them because there are more points to attract together. Methane has a very short chain length of only 1 carbon, so the intermolecular forces are very weak. Because the forces are weak, very little energy is required to overcome them to allow the substance to become gaseous (gas molecules spread out to fill any space, requiring a negligible strength of intermolecular forces).

Consequently the boiling point of methane is so low that it is found in gaseous form almost all of the time on Earth - however Titan, one of the moons of Saturn, has seas of methane on its surface, because it is so cold there that it is possible for methane gas to condense into liquid.
In order to consider the boiling point of a substance, we need to think about the forces holding the molecules together. Because methane (CH4) is a non-polar molecule the molecules are held together only by London Dispersion Forces which are very weak and easy to break. These bonds break when methane boils and because they are weak, it boils at a low temperature.

Identify the terms,like terms,coefficients and constants


2+3a+9a

Answers

Like terms :  3a and 9a

Terms: All of them

Coefficients:  3 and 9

Constant : 2
Like terms in algebra are terms that have the same variables and power. Constants contain only numbers, we call them constants because their values don't change. Coefficients are the numbers in front of the variable ex: 5y in that expression 5 is the coefficient. So in the expression 2+3a+9a there is one constant which is 2 the likes terms are 3a and 9a because they have the same variable. And the coefficients are 3 and 9 because they are in front of the variable.

How to I find the number of electrons in and Atom?

Answers

Look at the atomic number of an element on the periodic table which is the smaller number.
The atomic number shows the number of protons/electrons so the number of protons and electrons are the same.
Whereas the mass number of an element (the other number) is the number of protons + neutrons.

Please helpRadiocontrast dyes are considered safe because the isotopes have short half-lives and the isotopes coat the gastrointestinal tract and are not absorbed by normal tissue. If a patient ingests 10.0 mg of iodine, how long until the iodine-134 is 99% out of the patient's system if the half-life of iodine-134 is 52.6 minutes?

Answers

In 52.6 mins the 10 mg of iodine will be divided by its half-life which is 2 it will become 5 mg  (in 52.6 minutes ) and same procedure will be followed until it reach 99% out of the patient's system.

The answer is 368 minutes will it takes the iodine to be absorbed in one's system.

Which do all groups of plants have these are the choices A.chloroplasts B.roots C.spores D.tubes

Answers

A.chloroplasts every plant needs it
Chloroplast, Needed to turn light into energy.

What is the formula for vandium oxide

Answers

V2O5 hope this helped!!!!
Other Questions
1.00 L of gas at a standard temperature and pressure is compressed to 473mL. What is the new pressure of the gas?
To test a hypothesis,a scientist designs a (n)------
What is the collection of protons and neutrons in the center of an atom called
What is the potential energy when you roll a object down a ramp