Someone plz help me ;-;

Answer:

I'm sorry, you didn't post the pictures.

Solution: Change in state of matter is a physical change because of the physical condition and appearance changes but not the chemical composition.

Answer:

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. ... The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.

Answer:

Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number.

Explanation:

Answer:

Sometimes, fires occur naturally, ignited by heat from the sun or a lightning strike. However, most wildfires are because of human carelessness such as arson, campfires, discarding lit cigarettes, not burning debris properly, playing with matches or fireworks.

Answer:

If you increase the mass at a given force the rate of acceleration slows. Therefore, mass is inversely proportional to acceleration. ... Force is directly proportional to acceleration (force ~ acceleration) As force increases acceleration increases.

acceleration slows down .

Explanation:

if we increase the mass at a given force the rate of acceleration slows

Answer:

21.09 g of AgCl

Explanation:

Hopefully the picture is clear and the method is understandable.

For more information go to

https://socratic.org/questions/5631d10b11ef6b4609a78ee2

Answer:

becoz vvv is always with you

Answer:

Alkali metals have one valence electron on their outer shell. They are more stable when they have eight valence electrons so they tend to loose that one electron and obtain a full octet, therefore become stable

Answer:

This bag has been made from introduced materials, but before foreign fibres were used dilly bags were made from bark, leaves, stems, roots, human hair, animal fur and animal sinew.

Answer:

b

Explanation:

because I had that on my homework and got it correct

b

Explanation:

because I had that on my homework and got it correct

Answer:

Ammonia

Explanation:

I believe that ammonia is the correct answer to this question.

Answer:

the number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge

Explanation:

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Explanation:

Four importances :

1. Solution of tea leaves, water and sugar is used to make tea

2. Solutions of the chemicals are used in labrotary

3. The drinks that we take are also a kind of solution

4. The air is also a solution of different gases

Answer:

A

Explanation:

Explanation:

what you have to do is to multiply the given grams with the ratio of grams of that certain element in it's full compound in order to isolate the compound and get the element.

because the question did not specify how many grams of NO2 is formed, we can assume that the mass is neglegible, thus 1 mole was assigned to Nitrogen.

Since we know that 1.245g of Cu(OH)2 was obtained after the solid precipitated in water, it means that the remaining has to be CuSO4. Thus, we can take the difference between the two masses to get the mass for CuSO4.

After that, divide the mass of CuSO4 by the overall mass of the impure substance, multiply it by 100, and you will get the percentage of purity.

Answer:

4 ans is 3,5ans is iv i know only this much

Answer:

see picture for answer

Explanation:

independent and dependent variables.

1)

Now it's time to state your hypothesis. ...

2) The hypothesis is often written using the words "IF" and "THEN." For example, "If I do not study, then I will fail the test." The "if' and "then" statements reflect your independent and dependent variables.

Hydrogen: 1

Helium: 2

Lithium: 2•1

Beryllium:2•2

Boron: 2•3

Carbon: 2•4

Nitrogen:2•5

Oxygen:2•6

Fluorine: 2•7

Neon:2•8

Sodium: 2•8•1

Magnesium: 2•8•2

Aluminium: 2•8•3

Silicon: 2•8•4

Phosphorus: 2•8•5

Sulfur: 2•8•6

Chlorine: 2•8•7

Argon: 2•8•8

Potassium: 2•8•8•1

Calcium: 2•8•8•2

Please give me brainliest, I spent a lot of time doing this

Advantages

Chemistry helps you to understand the world around you.

Basic knowledge of chemistry helps you to read and understand product labels.

Chemistry can help you make informed decisions.

Chemistry is at the heart of cooking.

A command of chemistry can help keep you safe!

Disadvantages

It isn't a sustainable form of energy.

It can be expensive.

Some forms of chemical energy are quite rare.

It can produce harmful waste.

It can be used to create devastating weapons.

It offers short-term benefits for long-term consequences.

Answer:

A: Cellulose

Explanation:

Cellulose in paper and tree

Answer:

0.0001 Tg 100000 kg

0.001 Tg 1000000 kg

0.01 Tg 10000000 kg

0.02 Tg 20000000 kg

Explanation:

Answer:

Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.

Explanation:

Atom refers to the smallest constituent unit of a chemical element. Molecules refer to a group of two or more atoms that are held together due to chemical bonds.

Answer: Atoms are single neutral particles while molecules are neutral particles made of two or more atoms bonded together

Answer:

Convert the rate of 271.7 gallons/min to an equivalent rate of cL/week. Present your answer in scientific notation rounded to the proper number of sig figs.

Explanation:

Explanation:

Actually, the diagram showned in the picture gave you some hints.

Moving every one block to the left indicates 10 times the value of the symbol than the previous one.

For instance,

[tex]1\text{ km}=10^1\text{ hm}=10^2\text{ dam}=10^3\text{ m}[/tex]

Take the first question as example, since "k" is 9 blocks from the left of mu (u),

[tex]1 \text{ kg}=10^9 \text{ }\mu\text{g}[/tex]

[tex]\text{So }.000078\text{ kg}=.000078\times10^9 \text{ }\mu\text{g}=7.8\times10^{-5}\times10^9 \text{ }\mu\text{g}=7.8\times 10^4\text{ }\mu\text{g}[/tex]

Similarly,

[tex]1 \text{ cL}=10^{-2} \text{ L}[/tex]

[tex]\text{So }34800\text{ cL}=34800\times10^{-2} \text{ L}=3.4800\times10^{4}\times10^{-2} \text{ L}=3.48\times 10^2\text{ L}[/tex]

[tex]1 \text{ Mm}=10^{3} \text{ km}[/tex]

[tex]\text{So }.0283\text{ Mm}=.0283\times10^{3} \text{ km}=2.83\times10^{-2}\times10^{3} \text{ km}=2.83\times 10^1\text{ km}[/tex]

The given sample of 10 grams shows the mass of the following compounds.

(LiCl, LiBr, LiF, LiI).

To arrange them in hierarchical order from the least to the greatest, we need to determine their respective number of moles because it is directly proportional to their atomicity.

By using the formula:

[tex]\mathbf{Number \ of \ moles = \dfrac{mass}{ molar \ mass}}[/tex]

For LiCl, its molar mass = (42.39) g/mol

[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{42.39 \ g/mol}}[/tex]

number of mole for LiCl =  0.2359 moles

For LiBr, its molar mass = (86.85) g/mol

[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{86.85 \ g/mol}}[/tex]

number of mole for LiBr =  0.1151 moles

For LiF, its molar mass = (25.94) g/mol

[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{25.94 \ g/mol}}[/tex]

number of mole for LiF = 0.3855 moles

For LiI, its molar mass = (133.85) g/mol

[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{133.85 \ g/mol}}[/tex]

number of mole for LiI = 0.0747 moles

Therefore, we can conclude that the samples in hierarchical order from the least to the greatest is as follows:

LiI < LiBr < LiCl < LiF

Learn more about atomic numbers here:

https://brainly.com/question/17274608?referrer=searchResults

Now lets she s-subshell structure .

Take an element Berylium

[tex]\huge{\overset{1s^2}{\boxed{\uparrow\downarrow}}\overset{2s^2}{\boxed{\uparrow\downarrow}}}[/tex]

You can see the S-orbital has only space for 2electrons .

Come to p-orbital

Take an element Neon

[tex]\huge{\overset{1s^2}{\boxed{\uparrow\downarrow}}\overset{2s^2}{\boxed{\uparrow\downarrow}}\overset{2p^6}{\boxed{\uparrow\downarrow}\boxed{\uparrow\downarrow}\boxed{\uparrow\downarrow} }}[/tex]

The 2 means its L shell .

It has 8 electrons only and full filled .