whoever answers this first gets brainly

Answer:

4.06×10^23

Explanation:

1 mole has 6.023×10^23 molecules

0.675 moles have (6.023×10^23×0.675) molecules

Answer:

3.67 L

Explanation:

From the question given above, the following data were obtained:

Initial temperature (T1) = 300 K

Initial volume (V1) = 4 L

Final temperature (T2) = 275 K

Final volume (V2) =?

Thus, we can obtain the final volume (i.e the new volume) of the balloon by using the Charles law equation as shown below:

V1 /T1 = V2 /T2

4/300 = V2/275

Cross multiply

300 × V2 = 4 × 275

300 × V2 = 1100

Divide both side by 300

V2 = 1100 / 300

V2 = 3.67 L

Therefore, the new volume of the balloon is 3.67 L

Answer:

Catalyse

Note that I'M NOT A SCIENCE TEACHER! I MIGHT BE INCORRECT, DOUBLE CHECK YOUR ANSWER!

Stay safe and Merry Christmas! :)

Answer:

Catalyse

Explanation:

Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst.

Top answer is most likely true

Answer:

5 hours is 300 minutes so it goes 1 mile per minute. So 82 minutes = 1 hour and 22 minutes.

Explanation:

So if the car goes 1 mile every minute to reach 82 miles you have to

1 x 82 = 82 minutes converted into hourse = 1 hour and 22 minutes :)

Answer:

Explanation:

The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties. This is because they have the same number of outer electrons and the same valency.

C

Pure water is at 7, and the bases are above 7 and the acids are below 7.

The pH of the solution that is classified as a weak base is 10. Details about weak bases can be found below.

pH of a solution refers to the degree of acidity or alkalinity of that solution.

The pH scale reads from 1 - 14 where the following applies:

A weak base will have a pH close to neutral, therefore, the pH of the solution that is classified as a weak base is 10.

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Answer:

Yeast is used for the leavening of bread. Yeast uses the sugars and oxygen in dough to produce more yeast cells and carbon dioxide gas. The carbon dioxide makes the dough rise which gives the bread a light and spongy texture. Yeast also works on the gluten network.

Explanation:

Answer:

I think 20

Explanation:

Becu of science

Answer:

its cold

Explanation:

Answer:

Noble games are the least reactive because their outer shells are already full with 8 electrons.

Answer:

B: Mercury

Explanation:

Yuh

Answer:

I believe it's an example of velocity

Explanation:

This is because 85miles/hour south is giving both magnitude (85miles/hour) and direction (south)

Answer:

B-After the 3s sublevel is filled with two electrons, each additional electron goes into the 3p sublevel.

Explanation:

Edmentum

Answer:

Mass = 331.17 g

Explanation:

Given data:

Mass in gram = ?

Number of atoms of K₂SO₄ = 1.18 × 10²⁴ atoms

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

1.18 × 10²⁴ atoms × 1 mol / 6.022 × 10²³ atoms

0.19× 10¹ mol

1.9 mol

Mass of K₂SO₄:

Mass = number of moles × molar mass

Mass = 1.9 mol × 174.3 g/mol

Mass = 331.17 g

The graph (A) best represents the relationship between the volume and the pressure of a gas.

The force was applied perpendicular to an object's surface per unit area across which that force is spread is known as pressure. The relationship between pressure and volume can be understand with the aid of ideal gas law.

PV=nRT.

where, P is pressure, V is volume.

It can be seen that when temperature will kept constant then pressure will be inversely proportional to the volume. It can be shown as:

P ∝ 1/V.

Therefore, graph A represent relationship between pressure (P) and volume (V).

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Mercury is in a liquid state

Mercury's melting point is somewhere around -34 Degrees Celcius. Thus it should be assumed it will be a liquid at this temperature. Not a gas however as mercury's boiling point is somewhere in the 600 Degree range

Answer:

Magnesium and barium

Explanation:

They are both Alkaline earth metals. All the alkaline earth metals react with water to produce hydrogen gas and the metal hydroxide, although somewhat less vigorously than the alkali metals.

The organization and colors in the periodic table magnesium and barium are the two element with most of the similar properties because they both belongs to alkaline earth metals.

Periodic table are defined as an arrangement of all the elements known to man in accordance with their increasing atomic properties and recurring chemical properties. 118 elements are arranged in periodic table.

Alkaline earth metals are defined as any of the divalent strongly basic metal of group 2 of a periodic table comprising beryllium, magnesium, calcium, barium and radium.  

Thus, the organization and colors in the periodic table magnesium and barium are the two element with most of the similar properties because they both belongs to alkaline earth metals.

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Answer:

It is newtons First Law:)

Explanation:

Answer:

Did you put that in right because i've never heard of a compound called that nor is there a compound called that on the internet

Explanation:

You must of put that in wrong

Answer:

B. Which type of teeth are most important in crushing food?

Explanation:

According to the question physical changes ought to be entered into column A while chemical changes ought to be entered into column B.

The crushing of food is a physical change. It does not involve any chemical transformation of the food material.The other options involve some sort of chemical transformation taking place on the food material being digested.

Answer:

does friction talks ? friction is a oppossing force tho

Answer: Be, Ca, Ra

Explanation:

Elements are distributed in groups and periods in a periodic table.

Elements that belong to same groups will show similar chemical properties because they have same number of valence electrons.

Berrylium (Be) , Calcium (Ca) and radon (Rn) are elements which  belong to Group 2. They have 4, 20 and 88 electrons respectively and contain 2 valence electrons each and thus can lose two electrons to complete their octet. Thus they will show similar chemical properties.

The chemical reactivity of elements is governed by the valence electrons present in the element.

it would be A ,inorganic Compound

Answer:

hope it helps...

Explanation:

Atomic Number as the Basis for the Periodic Law

Assuming there were errors in atomic masses, Mendeleev placed certain elements not in order of increasing atomic mass so that they could fit into the proper groups (similar elements have similar properties) of his periodic table.

Answer:

yes I can find a pic of the iodine planetary model

Explanation:

U my friend OMG ^-^