What is the atomic mass
of an atom of calcium,
Ca?

Answer:

E. ^51 V

Atomic number (number of protons in the nucleus): 23

Atomic symbol (on the periodic table of the elements): V

Atomic weight (average mass of the atom): 50.9415

Density: grams per cubic centimeter

Phase at room temperature: Solid

Melting point: 3,470 degrees Fahrenheit (1,910 degrees Celsius)

Boiling point: 6,165 F (3,407 C)

Number of isotopes (atoms of the same element with a different number of neutrons): 2; one stable V-51; one radioactive V-50

Most common isotopes: V-51 (99.75 percent natural abundance)

Answer:

Water has less compressibility. When you squeeze it, it has no place to escape.

Explanation:

Answer:

3

Explanation:

The reaction is given as:

           H₂S   +   O₂   →  SO₂    +    H₂O

Let us balance the chemical equation.

 We take some letters and we use them as the coefficient to balance the equation;

          aH₂S   +   bO₂   →  cSO₂    +    dH₂O

Now,

  Conserving H;

         2a  = 2d

 Conserving S;

         a = c

 Conserving O;

        2b  = 2c + d  

Let a  = 1, d  = 1, c  = 1, b  = [tex]\frac{3}{2}[/tex]  and multiply through by 2;

    a = 2, b  = 3, c  = 2 and d = 2

So, the balanced reaction equation is given as;

    2H₂S   +   3O₂   →  2SO₂    +    2H₂O

Answer:

Wavelength, distance between corresponding points of two consecutive waves. ... Wavelength is usually denoted by the Greek letter lambda (λ); it is equal to the speed (v) of a wave train in a medium divided by its frequency (f): λ = v/f.

Explanation:

Answer:

1.08 x 10^2 gm of H2O

Explanation:

number of moles of O2 = 97g /32 g/moles = 3.03 moles

3.03 moles of O2 produces 6.06 moles of H2O

amount of water produced = 6.06 mol x 18 g /mol = 109.08 g = 1.08 x 10^2 g

2Mg(s)+O₂(g)⇒2MgO(s)

Equalization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Reaction(syntesis / combination)

Mg(s)+O₂(g)⇒MgO(s)

give coefficient

aMg(s)+bO₂(g)⇒MgO(s)

Mg, left=a, right 1⇒a=1

O,left=2b,right 1⇒2b=1,b=0.5

Mg(s)+0.5O₂(g)⇒MgO(s) x 2

2Mg(s)+O₂(g)⇒2MgO(s)

Answer:

Na2O

explanation.

Ionic bonds refers to complete transfer of electrons from one atom to another

Answer: It is a

Explanation:

Answer:B

Explanation:

Answer:

A. It is made up of only one substance

Explanation:

Answer:

101.4pKa

Explanation:

Given parameters:

Initial Volume of helium  = 3.20L

Final pressure of helium  = 59kPa

Final volume on helium gas = 5.5L

Unknown:

Initial pressure exerted on the balloon = ?

Solution;

To solve this pressure - volume problem, we simply apply the Boyle's law.

It states that "the volume of a fixed mass gas varies inversely as the pressure changes if the temperature is constant".

  Mathematically;

         P1 V1  = P2 V2

Now, insert parameters and solve;

         P1 x 3.2 = 59 x 5.5

          P1  = 101.4pKa

Answer:

Matter cannot be created or destroyed.

Explanation:

According to law of conservation of matter, Matter can neither be created nor destroyed. It just gets converted into other forms.

So, It's important to equalize the no. of moles on either side of the chemical reaction.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

Answer: 227.5 grams

Explanation:

Answer:

227.5

Explanation:

Acellus

The owls in the certain area located in the picture represent a population, they are formed up as a small group of animals representing a small species.

The level of ecological organization that all owls in a given area represent is the population of owls in a given area.

In ecology, the organism, population, community, ecosystem, and biosphere are among the levels of organization. A population is a collection of creatures from the same species that coexist in one location and communicate with one another.

Researchers in the field of ecology focus on five major levels: organism, population, community, ecosystem, and biosphere. These levels are sometimes studied separately and other times they overlap. Let's examine each stage one by one.

The owls in the particular location shown in the image are a population; they are made up of a few individuals representing a single small species.

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Answer:

A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.

Explanation:

Answer:

I did not understand

i donot know it is correct

(i think 2 one is the best)

Explanation:

Answer:

This happened because of evaporation, the sun evaporated the water.

Answer:

Because if you place the plate filled with water in the sun then a small amount of water will be dried up by the sun's heat.

Answer:

The climate was very hot and became colder in later time periods.

Answer:

The climate was very hot in earlier time periods and became colder in later time periods.

Answer:planting more trees

Explanation:

Trees go through photosynthesis and uses carbon dioxide (CO2) and changes it to oxygen

Answer:

B. Xenon

Explanation:

A.P.E.X

According to the electronic configuration,the element which rarely reacts is xenon as it has 8 electrons in it's valence shell.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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Answer:

D

Explanation:

Explanation:

A single covalent bond is made up of 2 electrons (one from each atom). It is represented with a single line.

Each line is represented as one dot and one cross (. x)

A double covalent bond is made up of 4 electrons (2 from each atom). It is represented using 2 lines. As dot and cross, it will be represented with 2 dots and 2 crosses.

A triple covalent bond is made up of 6 electrons (3 from each atom). It is represented using 3 lines. As dot and cross, it will be represented with 3 dots and 3 crosses.

Know the number of electron (s) needed by the atom to have noble gas configuration / stable (Key: You should know your electron arrangement / group number / Refer to table provided)*.

Groups and the number of electrons needed for atoms to have noble gas configuration or have full outer shell(s).

Group 4: Four (4) electrons needed for the outer shell to become full / noble gas configuration;

Group 5: Three (3) electrons needed by the atom to have a full outer shell / noble gas configuration;

Group 6: Two (2) electrons needed

Group 7: One (1) electron needed

Answer:Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest. So the asnwer is helium

Explanation:

Answer:

b. close to 0 degree celsius

Explanation:

100 g * ( x-0)= 500 g * ( 25-x) , where x is the new temperature reached

if we solve for x , we get 20 degree celsius

i.e. the temperature of ice increases to 5 degree celsius and the temperature of water drops to 5 degree celsius

hope it helps.

Answer:. that contains the same number of entities as there are atoms in 12 g of carbon-12. ... the same as the mass of one mole of the compound in grams. • Skill 3-1 Calculate the ... Molar mass has units of grams per mole (g/mol). Concept 3. ... of moles to mass: •We can do the reverse with 1/M, and convert any mass in grams to.

Explanation:

The number of atoms in a mole of boron and carbon is required.

A mole of carbon and a mole of boron have the same number of atoms.

The unit of amount of substance is called mole.

[tex]1\ \text{mole}=6.022\times 10^{23}\ \text{atoms, molecules, ions, or electrons}[/tex]

So, 1 mole of any element, whether it be carbon or boron has the same number of atoms which is [tex]6.022\times 10^{23}[/tex].

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Answer:

B

Explanation:

There can be no reaction because Au is above H on the activity series and cannot react.

Answer: B is correct

Explanation: I took the quiz

Answer:

Bb

Explanation:

Answer:

how will water affect the force of friction

90% sure