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julia-pushkina [17]

3 years ago

15

In 1687, ___ explained that gravitational forces hold the solar system together.

2 answers:

elena55 [62]3 years ago

5 0

The answer is A. Newton

Nimfa-mama [501]3 years ago

3 0

Newton ,perhaps as many other originations use it as a gravitational law

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Imagine you find a bowl filled with clear liquid

mash [69]

Answer:

nice

Explanation:

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3 years ago

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Sound travels in waves. Sound waves are compression waves. Pick the place where it is impossible to hear sounds.

Arturiano [62]

You can not hear sound in vacuumed places like space. Wherever there is a high altitude, it makes it harder to hear sound and harder to breathe. Sound travels best in solids. Hope that helps a little bit.

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4 years ago

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Question: Multicellular organisms have five levels of organization ranging from simplest to most complex. The simplest level is

lapo4ka [179]

From Simplest to Most Complex, it follows this order.

Cells
Tissue
Organs
Organ Systems
Organisms

Given a sentence and an exmaple about them:

Cells: They are the fundamentals in all living things. They have a nucleus, cytoplasm, and organelles which is all surrounded by a cell membrane. Example: Skin Cells, Blood Cells.

Tissue: It is close to Cells, it consists of the material that animals and plants are made, but it also consists specialized cells and their product. Example: Muscle Tissue, Epithelial Tissue.

Organs: Pretty much a part of the body that specializes in a specific function. Example: Liver, Stomach.

Organ System: This is kind of like Organs, however they are a system of organs that rely on each other, whether it is directly or indirectly. Examples: Muscular System, Circulatory System.

Organelles: These are the parts that makes up what a cell is. Exmaple: Golgi Body, Lysosomes.

8 0

4 years ago

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Determine the oxidation states of the elements in the compounds listed. None of the oxygen-containing compounds are peroxides or

choli [55]

Explanation:

a) $H_2SO_4$

oxidation state of H = +1

Oxidation state of O = -2

Let the oxidation no. of S be x.

$2\times1+ x+2\times -4 =0$

$2 +x-8 = 0\\x=+6$

Oxidation state of S in $H_2SO_4$ = +6

b) $Ca(OH)_2$

oxidation state of H = +1

Oxidation state of O = -2

Let the oxidation no. of Ca be x.

$x+2\times-2+2\times+1 =0\\x=4 -2\\x=+2$

Oxidation state of Ca in $Ca(OH)_2$ = +2

c) BrOH

oxidation state of H = +1

Oxidation state of O = -2

Let the oxidation no. of Br be x.

$x+1\times-2+1\times+1 =+1$

Oxidation no. of Br in BrOH is +1

d) $ClNO_2$

oxidation state of Cl = -1

Oxidation state of O = -2

Let the oxidation no. of N be x.

$-1+x+2\times-2\\x = 4+1 =+5$

Oxidation state of N in $ClNO_2$ = +3

e) $TiCl_4$

oxidation state of Cl = -1

Let the oxidation no. of Ti be x.

$x+4\times -1 = 0\\x=+4$

Oxidation state of Ti in $TiCl_4$ = +4

f) NaH

Na is more electropositive than H.

Therefore, oxidation state of Na = +1

Oxidation state of H = -1

6 0

3 years ago

In a chemical equation, if 2 atoms of chlorine are used in the reactants to form calcium chloride, how many formula units of cal

elena-s [515]

Explanation:

The given reaction is as follows.

$Ca + Cl_{2} \rightarrow CaCl_{2}$

The number of elements on reactant side are as follows.

Ca = 1
Cl = 2

The number of elements on product side are as follows.

Ca = 1
Cl = 2

Therefore, the equation is completely balanced.

Thus, we can conclude that only one formula units of calcium chloride must be part of the products.

5 0

3 years ago