Need help ASAP... The diagram shows a box in the periodic table.. what is the atomic number of the element??​

Answer:

Freedom is when everyone tells you to wear your mask, but if you dont feel like it, you choose to not wear your mask. Even though you have the choice between getting the infection or not, you can still choose to get the virus.

Explanation:

Answer:

Igneous

Explanation:

the distance traveled and the time it took to travel that distance

Answer:

may be mp3 player......

Answer:

mp3 player

Explanation:

Neon sign contains Neon

Flash camera contains Xenon

Helium balloon contains Helium

Answer:

Mass = 24.52 g

Explanation:

Given data:

Mass of sulfuric acid = ?

Number of moles of sulfuric acid = 0.25 mol

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of sulfuric acid is 98.07 g/mol

Now we will put the values in given formula.

0.25 mol = mass/ 98.07 g/mol

Mass = 24.52 g

Answer:

B

Explanation:

The reaction will occur naturally

Answer:

B. A pE x

Explanation:

Trust

Answer:

Chemical

Explanation:

The rotting of fruit is a chemical reaction. This is because when fruit spoils, an enzymatic reaction occurs. Because an enzymatic reaction causes molecules to change when rotting, rotting is a chemical reaction.

well,It is a chemical change because once an apple rots, it cannot go back to its original form as a new, clean, and fresh apple. and that is a chemical change. making it be different on a chemical level.

Answer:

chemical change

Explanation:

the reason for a fruit to rot is the enzyme reactions in it we can take that as a solid reason and on the other hand if it is a physical change we can reverse the change that means we should be able to take a rotten fruit and make it to its original position so that we can have it. but we can never do that so we can prove that rotting of fruits is a chemical change.

hope this helps

Answer:

where is the question please send question I will give don't worry

equal to its atomic number

Answer:

The number of protons id equal to the atomic number on the periodic table.

Explanation:

All the heat needed to raise the temp of something at a given degree.

Q=mc△T

Q= heat energy

m= mass

c= specific heat capacity

△T= change in temperature

Answer: hope this helps if so mark me brainlest

Explanation:

The four quantum numbers determine the state of the electron, and are

n

is the distance of the orbital from the nucleus (

1

,

2

,

3

,

4

etc),

l

is the shape of the orbital (

0

→

n

−

1

)

m

l

is the orientation of the orbital in space (

−

l

→

+

l

), and

m

s

is the spin of the electrons inside the orbital (

−

1

2

or

+

1

2

).

The electronic configuration for magnesium is

1

s

2

2

s

2

2

p

6

3

s

2

. The outermost electron is one in the

3

s

orbital, which means that

n

=

3

.

It also means that

l

=

0

, since

s

is basically shorthand for the orbital shape of

l

=

0

.

m

l

can range from

−

l

to

+

l

, but since

l

=

0

, then

m

l

must also be

0

.

Finally,

m

s

can be either one since there are two electrons in the

3

s

orbital and it doesn't really matter which spin you choose.

Putting all of these together, the final quantum numbers of a magnesium atom are

3

,

0

,

0

,

±

1

2

Answer:

С. After evaporating a liquid, there is nothing left behind

Explanation:

In chemistry, a pure substance is that substance that has a definite chemical composition. It cannot be separated using physical means as the chemical bonds that forms it have to be broken. Pure substances include elements and compounds.

According to this question, a good evidence that an unknown sample is a pure substance would be that: After evaporating a liquid, there is nothing left behind. This means that after using physical separation technique, THE PURE SUBSTANCE COULD NOT BE SEPARATED, hence, nothing is left behind.

Answer:

Hydrogen atoms

Answer:

Final Volume = 0.31L

Explanation:

Initial volume V1 = 1L

Initial pressure P1 = 150kPa

Initial temperature, T1 = 25'C + 273 = 298K

Final Pressure P2 = 600kPa

Final Temperature T2 = 100'C + 273 = 373K

Final Volume V2 = ?

The combined gas law is given as;

P1V1 / T1  = V2P2 / T2

150 * 1 / 298 = V2 * 600 / 373

V2 = 55950 / 178800 = 0.31L

Answer:

physical change

Explanation:

it has to be 20 charchters long

Answer:

I don't think so

Explanation:

The equation doesn't look balanced

Answer:Lavoisier is known as the “Father of Modern Chemistry” or the “Father of Chemistry”.

Explanation:

Bases are the chemical opposite of acids. Acids are defined as compounds that donate a hydrogen ion (H+) to another compound.

Definition of Acids - An acid is any chemical compound which when dissolved in water gives a solution with a hydrogen ion activity greater than in pure water. Bronstead Lowry

Definition of Base - A base is an aqueous substance that can accept hydrogen ions. Bronstead Lowry Definition: A base is any substance which accepts a proton.

Physical Characteristics of Acids - Depending on the temperature, acids can occur in solid, liquid or gaseous form. Taste sour.

Physical Characteristics of Base - Bases feel slippery because of the reaction of the base with the oils of your hand. Frequently solids except ammonia which is a gas. Taste bitter.

Properties of Acids - Electrolytes, conduct electricity (because electrolytes), react with many metals.

Properties of Base - Electrolytes, conduct electricity, ranges from insoluble to so soluble that they can react with water vapor.

Acids are often used to remove rust from metals, as an electrolyte in batteries, for mineral processing, to produce fertilizers and gasoline and as additives in food and beverages. Bases are used primarily in cleaning as dishwashing and laundry detergents, oven cleaners and stain removers.

Here are some differences! Hope this helps, sorry I couldn't think of anything else. ;(

Answer:

where is the answer options because it sounds like I need some

Answer:

Sodium Hydride=NaH which has 1 sodium atom, and 1 hydrogen atom, i know this because  there are no added numbers meaning theres one of each element.

Explanation:

Answer:

yes it is

Explanation:

Answer:

huh

Explanation:

Answer:

the bread rising shows that it’s baking which is a chemical reaction

Explanation:

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{5.67 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 9.418604...[/tex]

We have the final answer as

Hope this helps you

Answer:

Look at your periodic table

Explanation:

It tells you everything like Potasium 1 and 1 ox and 1 hydrogen

Answer:

cellular respiration

Answer:

the answer is A. cellular respiration

Answer: A

Explanation: A is the answer

Gravity, friction, and balance keeps people able to not fall off a skateboard.