help me, please, i need it

Answer:

The correct answer is C.

Explanation:

To solve this problem, we should first recall possible units for mass and volume.  Mass can be represented with units of grams, kilograms, etc.  Volume has units of cubic meters, cubic centimeters, etc.

Therefore, since we know that density is mass divided by volume, the only answer that makes sense here is C. grams per cubic centimeter (where per signifies that grams are being divided by cubic centimeters).

Hope this helps!

Answer:

noble gases are very high because they have the maxium amount of electrons in their outer shell

Explanation:

Given parameters:

Density of the rock = 2.2g/cm³

Volume of rock = 66.5mL

Unknown:

Mass of the rock = ?

Solution:

Density is the mass per unit volume of a body. It is mathematically expressed as shown below;

          Density  = [tex]\frac{mass}{volume}[/tex]

So;

         Mass = Density x Volume

We need to take the given parameters to the same unit before we solve;

              convert mL to cm³

                 1mL  = 1cm³;  66.5mL is the same as 66.5cm³

Now solve;

          Mass  = 2.2 x 66.5  = 146.3g

The mass of the rock is 146.3g

Answer:

Diagram of the nuclear composition and electron configuration of an atom of barium-138 (atomic number: 56), the most common isotope of this element. The nucleus consists of 56 protons (red) and 82 neutrons (blue).

Answer:

A photon of green light has a higher energy since it has a higher frequency than the yellow photon. And we can see that on the picture representation of the light spectre.

Answer:

9.11 x 10 -28 grams

Explanation:

Answer:

Should be Mercury.

Explanation:

The atmospheres of the terrestrial planets range from thin to thick. Mercury has almost no atmosphere.

Answer:

Find It Myself, Ask the Community, Get Live Help

Explanation:

The three main options for Microsoft users are Find It Myself, Ask the Community, Get Live Help. The first of which is finding it yourself through the search menu or help guidelines provided by Microsoft in all of their operating systems. Secondly, would be asking the community through search engines such as Google or through Microsoft help forums. Lastly, would be getting live help since Microsoft opertaing systems have a remote desktop feature that allows you to connect to another IT professional from a distance, or you can simply contact an IT professional to visit you in person for technical assistance.

Answer:

D.

Explanation:

I looked it up and said increases, i'm taking a test today in chemistry and had the same question lol.

Answer:

ca +n2 is impossible to get trough a ca3 +n2 so you have to try to find a reasnable question like ca+n2 = ca3n2 then you need witch is the same but the chimacl blanice is off so when mixing the chimcals try to reduce the can2

but also try to make it be a better salution

Explanation:

hope that helps also good luck

Answer:

it s not on periodic table this is not real element

Explanation:

Explanation:

B and C they are the pure substances

Elements are considered as  pure substances . Elements are mostly metals, non - metals and metalloids , so option C is right.

An element is a substance that cannot be broken down by non - nuclear reaction. Elements considered as a pure substance . All elements are mostly pure substances. A few of them include gold, copper, oxygen, chlorine, diamond, etc. Compounds such as water, salt or crystals, baking soda amongst others are also grouped as pure substances.

An element is a fundamental item that cannot be easily broken in smaller pieces. There are about 100 elements ,each with it's own types of atom. Everything in universe contain an atom of at least on or more than one elements.

Elements are pure substances ,hence option C is correct.

To learn more about elements refer the following  link;

https://brainly.com/question/14347616

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Answer:

3 g/cm3

Explanation:

d=m/v

=45/15

= 3 g/cm3

Answer:

2.46621 cm

Explanation:

i used the formula p = m/V

Answer:

2.7 moles of neon contain 16.3 × 10²³ atoms of neon.

Explanation:

Given data:

Number of moles of neon = 2.7 mol

Number of atoms of neon = ?

Solution:

We will use using Avogadro number to solve given problem.

"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 of neon = 6.022 × 10²³ atoms of neon

2.7 mole of neon × 6.022 × 10²³ atoms of neon / 1 mole of neon

16.3 × 10²³ atoms of neon

Thus, 2.7 moles of neon contain 16.3 × 10²³ atoms of neon.

Answer:Option D

Explanation:i took the test

Answer:

Chlorine can be found in abundance in both the Earth's crust and in ocean water. In the ocean, chlorine is found as part of the compound sodium chloride (NaCl), (table salt). In the Earth's crust, the most common minerals containing chlorine include halite (NaCl), carnallite, and sylvite (KCl).

Chlorine can be found in abundance in both the Earth's crust and in ocean water

Answer:

igneous rocks

Explanation:

igneus rocks are sometimes considered primary rocks because they crystallize from a liquid

Answer:A

Explanation: because it represents a salt which is a nonmetal

Answer:

-3

Explanation:

The charge of the ion is determined by the number of protons and the number of electrons.

Protons are a positive + charge.

Electrons are a negative - charge.

We have 7 protons and 10 electrons.

+7 charge

-10 charge

-10 + 7 = -3 charge

Answer:

Nitrogen

Explanation:

Answer:

It A(Ba3P2)

Explanation:

I took the test

Answer:

It A(Ba3P2)

Explanation:

Answer:

just the second

Explanation:

Answer:

both are changes in state, and both conserve mass. Hope it helps and please have a good day or night

Answer: energy

Explanation:hope this helps.

Answer:

Temperature

Explanation:

Answer:

Liquid

Explanation:

The substance had appears to have a fixed volume but took the shape of the bottle it was transferred to.

If the substance doesn't have the same volume, the answer would be gas.

Answer:

h2s

Explanation:

The closest chemical analogue for water is hydrogen sulphide or H₂S. Because, both oxygen and sulfur are same group elements and shows similar properties.

Hydrogen sulphide or  H₂S is a covalent compound formed by the combination of two hydrogens and one sulphur atoms. In this compound, each hydrogen shares one electron to sulfur and sulfur shares its two valence electrons to each hydrogen.

Water is  H₂O, which is formed by the strong hydrogen bonding between hydrogen and oxygen and it exists as liquid mostly. Most of the compounds can be dissolved in water.

Lithium oxide Li₂O is a covalent compound with partial ionic character and it does not exhibit any similarity with water in any case.

Bothe sulfur and oxygen are in 16th group. They are gases with high electronegativity. Hence, both H₂O, H₂S are polar compounds. Both sulfur and oxygen have affinity towards hydrogen. Both have similar shape and bond angle.

Moreover, H₂S can dissolve some minerals and acts as a good solvent like water.

Hence, the better substitute for water is H₂S.

To find more about H₂S, refer the link :

https://brainly.com/question/20365774

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Answer: Neutrons

Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

Answer:

neutrons

Explanation:

isotopes has the same proton number but different nucleon number because there's different numbers of neutrons in isotopes

Answer:

B. A net positive charge

Explanation:

a p e x 2021!