In a molecule of calcium sulfide, calcium has two valence electron bonds, and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium sulfide? Also, state why.
A. one
B. two
C. three
D. four
E. none

Answer:

PLEASE MARK AS BRAINLIEST!!

Explanation:

Calcium has an atomic number of 20 and an atomic mass of 40

The mass number of an isotope is the sum of the number of protons and neutrons in the atomic nucleus. The atomic number is the number of protons. The calcium-40 isotope has a mass number of 40 , and an atomic number of 20 , therefore it has 20 protons.

Answer:

D

Explanation:

Electrons are being filled according to the increasing other of their sublevel energy

Answer:

B. kinetic energy

Explanation:

The sum of kinetic energy and potential energy of an object is its total mechanical energy.

Answer:

23.33%

Explanation:

from

percent yield=(mass÷total mass )×100%

Answer:

1. Are Metals

2. Are Solids

3. Are Un-reactive

4. Have 18 valence electrons

Explanation:

In a color coded periodic table of the components, the crate for every component is colored. This tone speaks to the classes of components, which incorporate metals, metalloids and non-metals. All in all, the color blue is used for metals, orange for metalloids and green for non-metals. The periodic table might be further tone coded to incorporate different gatherings, for example, transition metals, rare earths, alkali metals, alkaline earths, halogens and noble gases.

The modern periodic table coordinates components by their nuclear number, which is extraordinary to every component. The nuclear number speaks to the quantity of protons in a particle of the component. In the cutting edge occasional table, the nuclear number increments from left to right and through and through. The occasional table is likewise coordinated into periods and groups. Periods are the rows and groups are the columns. The components in every period start with metals on the left side, at that point move to metalloids and afterward to non-metals on the right. The components contained in each group have comparative actual properties.

Answer:

Compounds are made of two or more atoms of different elements,

Explanation:

Answer:

6.022×1023 atoms —1.00 mol of atoms.

Explanation:

19.4 mol Kr

Chemistry

Stoichiometry

Gas Laws

Math

Pre-Algebra

Order of Operations: BPEMDAS

Step 1: Define

435 L Kr at STP

Step 2: Identify Conversions

[STP]   22.4 L = 1 mol

Step 3: Convert

[tex]435 \ L \ Kr(\frac{1 \ mol \ Kr}{22.4 \ L \ Kr} )[/tex] = 19.4196 mol Kr

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

19.4196 mol Kr ≈ 19.4 mol Kr

Answer:

Calculate the mass of silver phosphate produced if 30.0 grams of silver acetate completely reacts with sodium phosphate.

According to stoichiometry of the balanced chemical reaction between silver phosphate and silver acetate 8.359 g silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.In the given reaction 500.73 g of silver acetate produces 418.58 g silver phosphate, thus 10 g  silver acetate is produced when 10×418.58/500.73 =8.359 g.

Thus,  8.359 g silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate.

Learn more about stoichiometry,here:

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Explanation:

use the term electron sheilding, the more electrons between the valence el3ctron and nucleus the easier to lose the valence electron (more sheilding = easier to lose)

Answer:

it is molecular of an elements that consists two atoms

Answer:

Insects, bacteria and fungi

Explanation:

Answer with Explanation:

Water is a compound because it consists of two types of atoms (Hydrogen and Oxygen) that are chemically bonded. An "element" only consists of one type of atom, therefore, water is not an element but a compound. Its chemical formula is: [tex]H_{2} O[/tex]. This means that water consists of 2 atoms of Hydrogen that are bonded to an atom of Oxygen. Take note that a compound is different compared to the elements that it is made of. For example, water is essentially liquid in its form but it is different from the atoms of Hydrogen and Oxygen, which are gas in form.

Answer:

Water is a compound. It contains more than one element: hydrogen and oxygen atoms are joined together; as illustrated in the video clip Elements and Compounds, above. ... Water is not simply a mixture of hydrogen and oxygen; it contains hydrogen and oxygen atoms linked together in an ordered way.

Answer:

2180 g Cu(OH)₂

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

22.3 mol Cu(OH)₂

Step 2: Identify Conversions

Molar Mass of Cu - 63.55 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of Cu(OH)₂ - 63.55 + 2(16.00) + 2(1.01) = 97.57 g/mol

Step 3: Convert

[tex]22.3 \ mol \ Cu(OH)_2(\frac{97.57 \ g \ Cu(OH)_2}{1 \ mol \ Cu(OH)_2} )[/tex] = 2175.81 g Cu(OH)₂

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

2175.81 g Cu(OH)₂ ≈ 2180 g Cu(OH)₂

Answer:

Heres a very LONG answer-

The real answer:

Its in the kinetic-molecular theory, the temperature of a substance is related to the average kinetic energy of the particles of that substance. When a substance is heated, some of the absorbed energy is stored within the particles, while some of the energy increases the motion of the particles.

Answer:

Energy enters the biosphere as sunlight. Plants change this energy into chemical energy through the process of photosynthesis. Then, the energy is passed to organisms that eat the plants. Energy and matter are also passed between organisms when they eat one another.

pls give me brianliest and rate me

Explanation:

yes its hard if you don't pay attention.

Yes, the math is harder but chemistry is not it's really fun the math does get harder tho.

Answer:

Find ratio of atoms for empirical formula, divide mass by atomic mass

C=42.87/12 = 3.57

H= 3.598/1 = 3.598

O= 28.55/16 = 1.784

N= 25.00/14 =1.1785

to see ratio, divide by smallest no

Gives C2H2ON for empirical formula

Empirical mass = 24 +2 +16 + 14 = 56

165 to 170 /56 = 3

so molecular formula = empirical formula x 3= C6H6O3N3

1. The empirical formula of the compound is C₂H₂ON

2. The molecular formula of the compound is C₆H₆O₃N₃

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

Carbon (C) = 42.87%

Hydrogen (H) = 3.598%

Oxygen (O) = 28.55%

Nitrogen (N) = 25.00%

C = 42.87%

H = 3.598%

O = 28.55%

N = 25.00%

Divide by their molar mass

C = 42.87 / 12 = 3.5725

H = 3.598 / 1 = 3.598

O = 28.55 / 16 = 1.7844

N = 25.00 / 14 = 1.7857

Divide by the smallest

C = 3.5725 / 1.7844 = 2

H = 3.598 / 1.7844 = 2

O = 1.7844 / 1.7844 = 1

N = 1.7857 / 1.7844 = 1

Therefore, the empirical formula of the compound is C₂H₂ON

Molar mass of compound = (165 + 170)/2

Molar mass of compound = 335/2

Molar mass of compound = 167.5 g/mol

Empirical formula = C₂H₂ON

Molecular formula = Empirical formula × n = molar mass of compound

[C₂H₂ON]n = 167.5

[(12×2) + (2×1) + 16 + 14]n = 167.5

[24 + 2 + 16 + 14]n = 167.5

56n = 167.5

Divide both side by 56

n = 167.5 / 56

n = 3

Molecular formula = [C₂H₂ON]n

Molecular formula = [C₂H₂ON]₃

Therefore, the Molecular formula of the compound is C₆H₆O₃N₃

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Given :

Number of molecules of [tex]C_4H_2F_7I[/tex].

To Find :

How many moles are in given number of molecules.

Solution :

We know, in 1 moles of any element/compound contains [tex]6.022\times 10^{23}[/tex] at atoms/molecules.

So, number of moles in [tex]5.4\times 10^{24}[/tex] molecules are :

[tex]n = \dfrac{5.4\times 10^{24}}{6.022\times 10^{23}}\\\\n = 8.97 \ moles[/tex]

Therefore, number of moles are 8.97 .

Answer:

46.2 moles of NaOH are required.

Explanation:

Given data:

Moles of NaOH required = ?

Moles of H₂SO₄ = 23.1 mol

Solution:

Chemical equation:

H₂SO₄ + 2NaOH         →       2H₂O + Na₂SO₄

Now we will compare the moles of NaOH with H₂SO₄.

              H₂SO₄         :            NaOH

                1                :                2

             23.1              :        2×23.1 = 46.2

Thus, 46.2 moles of NaOH are required.

Answer:

i think it haven't impact because oxygen is very sensitive for our life and from plants there is so many kinds of food sources soo

Answer:

no

Explanation:

In Non-metals

Period - reactivity increases as you go from the left to the right. Group - reactivity decreases as you go down the group

In Metals

Reactivity increases down a group because as nuclear shielding increases and the nucleus' hold on the valence electron weakens, therefore it is easier to remove valence electrons.

Answer:

what r the options??????

Answer:

D the sun

Explanation:

The sun adds heat to make the water evaporate.

Answer:

B)

Explanation:

The sun causes evaporation by heat, the lamps bulb will get hot and be a model of the sun. We know this because heat evaporates water.

Answer:

Akash

Explanation:

it could be a magnet with the same poles facing eachoher

Answer:

1 A

3 main types of bond are

Ionic bond ( formed due to complete transfer of electron between atoms(

Covalent bond ( formed by mutual sharing of electron)

Metalic bond ( present in the metals due to mobile electrons)

1 B bond in CaO is ionic bond formation in attached image

1 C hydrogen bond with nitrogen is covelent NH3 ammonia is formed because a bond between two non metals is expected to be covalent

More their electronegativity difference between hydrogen and nitrogen is less than 1.7 that makes it covalent

Explanation:

Answer: This looks tough

Explanation:

Answer:

9 grams

Explanation:

Hope it can help you.....