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3 years ago

Describe the composition of the Earth’s atmosphere.

Biology

2 answers:

NemiM [27]3 years ago

5 0

Answer:

this is your answer

alexandr1967 [171]3 years ago

3 0

There are different layer leading into space and each layer has its own gravitational pull

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Which statement about bones is

Over [174]

I believe the answer is: C

3 0

2 years ago

What is the formula for this compound?

Delicious77 [7]

Answer:

Symbols: Each capitol letter means that there is a new element

Li2

Cl3

is made of lithium and chlorine

Na2

SO4 is made of sodium, sulfur and oxygen

Chemical Formulas are used to describe a chemical compound, when two or more atoms

combine to form a new substance.

A combination of chemical symbols shows the elements that make up a chemical compound.

The chemical formula for water is H2O

H stands for HYDROGEN.

O stands for OXYGEN.

Subscripts are numbers that come after a symbol and below. Subscripts tell you the number of

atoms of that element. If an element does not have a subscript, then it is understood that the

subscript is 1.

Li2Cl3 has two lithium atoms and three chlorine atoms

Na2SO4 has two atoms of sodium, one atom of sulfur, and four atoms of oxygen

A subscript outside a parenthesis affects all the elements inside the parenthesis. Multiply the

subscript on the outside by the subscript of the atoms on the inside.

Al (SO4)3 has 1 atom of aluminum, 3 atoms of sulfur, and 12 atoms of oxygen.

Coefficients are full size numbers in front of chemical formula. The coefficient multiplies everything

in the formula. It also represents the number of molecules of that compound.

2Na2

SO4 has 4 sodium atoms, 2 sulphur atoms, and 8 oxygen atoms.

2Al (SO4)

3 has 2 aluminum atoms, 6 sulfur atoms, and 24 oxygen atoms

When you count atoms, remember to multiply the coefficient number and the subscript number to find

the number of atoms of that element.

Explanation:

8 0

2 years ago

Read 2 more answers

Atoms with a low ionization energy give up their outer valence electrons with ease true or false

umka2103 [35]

Answer: The given statement is true.

Explanation: Ionization energy is defined as the amount of energy required to remove an electron from the outermost shell of an isolated gaseous atom.

General equation of ionization energy is given by:

$X(g)\rightarrow X^+(g)+e^-$

If the outermost electron is loosely bound to the nucleus which means that the electron can be easily removed form an atom, it will require less amount of ionization energy.

And if the outermost electron is tightly bound to the nucleus which means that the electron cannot be removed easily from an atom. And hence, it will require more ionization energy.

Hence, the given statement is true.

6 0

3 years ago

As the total cross-sectional area of blood vessels increases to the maximum area, the velocity is the?

xz_007 [3.2K]

Most appropriate answer is D !As vessels dialates the velocity of the blood flow decreases !

So both C and D is appropriate! But I will suggest D !

7 0

3 years ago

Which part of the nervous system is outside the brain and spinal cord?<br> nervous system

dedylja [7]

Answer: The peripheral nervous system.

Explanation: We have two parts to our nervous system. The central nervous system and the peripheral nervous system. The CNS is located in the brain and spinal cord the PNS is the nerves and ganglia outside of those.

5 0

3 years ago

Read 2 more answers