help for this practice work

Answer:

20,000 centigrams

Explanation:

Answer:

1.The electonic configuration of elements and their position in the periodic table are related to each other, From the electronic configuration of the elements, we can determine the period and the group to which the element belongs

Let's consider, sodium with atomic number 11 and k, l, and M shells have 2,8,and 1 electrons. since, there are 3 principal energy levels so we concluded sodium belongs to third period M Shell(valance shell) has only 1 electrons. so sodium belongs to group 1.

2. Entire D-block elements are known as Transition Elements.

3. Group 17 is the halogen group.

4. Main group of elements are...... 1,2, and 13 through 18.

5. Group 18 are the noble gas elements .

12. a). Smaller

b). Increases

c). More reactive

d). Softer

7. a). k › Ca › Ge › Br › Kr

b). Ra › Ba › Sr › Ca › Mg › Be

9. a). Ca(calcium) ion is smaller.

b). Cl(chlorine) atom is smaller.

c). Mg(magnesium) atom is smaller.

10. a). F(fluorine)

b). Sr(strontium)

c). Pb(lead)

d). At(Astatine)

Answer:

Water is weird because in solid state The molecules are combine then in liquid state they are wide apart.

Answer:

compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.

Explanation:

hope this helps

can u please give me and Brainlist

Answer:

Beta

Explanation:

Cause it emits in and become platinum so I believe  its beta

If Iridium (element 77) emits radiation and becomes platinum (element 78) gamma rays of radiation is emitted by the element.

Radiation in the  chemistry is a branch of nuclear chemistry which deals with the study of the chemical effects of radiation of alpha beta and gamma rays  on matter or any radioactive atom of periodic table.

This is very different from radio-chemistry as no radioactivity or radioactive rays needs to be present in the material which is being chemically changed by the radiation by removing proton from the nucleus.

Therefore, Iridium (element 77) emits radiation and becomes platinum (element 78) gamma rays of radiation is emitted by the element.

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Answer: Molecules gain or lose energy during any temperature change, not just phase changes.

Explanation:

If you think of a  heating or cooling curve, even when there isn't a phase change, the kinetic energy of the particles is still changing.

Explanation:

Word Equation

Barium Chloride + Sodium Chromate = Sodium Chloride + Barium Chromate

1 mole of aqueous Barium Chloride [BaCl2] reacts with 1 mole of aqueous Sodium Chromate [Na2CrO4] to form 2 moles of aqueous Sodium Chloride [NaCl] and 1 mole of solid Barium Chromate [BaCrO4]

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C. the forward reaction rate is equal to the reverse reaction rate

Chemical equilibrium is dynamic in nature and it can be attained only if the system is a closed one. At equilibrium the forward reaction rate is equal to the reverse reaction rate. The correct option is C.

The state of a system in which the measurable properties of the system do not undergo any further noticeable change under a particular set of conditions is called the state of equilibrium. The properties like pressure, concentration, etc. is constant at equilibrium and remain unchanged thereafter.

An equilibrium can be attained from either direction, i.e., from the direction of the reactants as well as from the direction of the products. At equilibrium the rate of forward reaction is equal to that of the backward direction.

In forward reaction, the reactants are converted into products and in backward reaction, the products are changed into the reactants.

Thus the correct option is C.

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Answer:

= 9.6125M

Explanation:

data:

volume = 800ml

              800/ 1000 = 0.8dm^3

molar mass of NaCl = 23 + 35.5

                                  = 58.5g

mass of NaCl = 450 g

moles= ?

molarity = ?

solution:

no. of moles = [tex]\frac{given mass}{molar mass}[/tex]

                      = 450 / 58.5

                     = 7.69 moles

now, molarity = [tex]\frac{moles}{volume in dm^3}[/tex]

                       = 7.69 / 0.8

         molarity= 9.6125 M

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Arrow head shows the direction of products formed in a reaction. so we can say that it denotes the direction of the chemical reaction. I.e From Reactant to Product.

so, the correct choice is B

Answer:

Rubber is an insulator.

Remaining three are metals and hence conductors.

The hydrogen ion concentration is  [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .

The pH scale is used to rank solutions in terms of how acidic or how basic they are.

It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution.

These ion concentrations are equal in pure water, which has a pH of 7.

The hydrogen ion and hydroxide ion are related as

[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[OH^{-}] }[/tex]

[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[5.42\times10^{-5} ] }[/tex]

[tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M

The hydrogen ion concentration is  [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .

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Answer: 0.02595 is your answer I looked it up

Answer:

.03

Explanation:

Answer:

The answer is Erosion, Weathering,

Explanation:

These all seem to be correct but i know for a fact those two are correct.

Answer:

Products are the species formed from chemical reactions. During a chemical reaction reactants are transformed into products after passing through a high energy transition state. This process results in the consumption of the reactants.

Explanation:

hope this helps if not let me know have a great day

Answer:

DNA sequence

Explanation:

When we say our DNA is different , we mean the sequence, or coding,  of DNA is different

Molarity is the molar concentration of the solution with respect to the moles and the volume. The molarity of the magnesium ion will be 0.339 M, and the Bromium ion will be 0.678M.

Molarity is the proportion of the moles of the solute to the volume in liters of the solution present. The compound magnesium bromide completely dissociates as:

MgBr² ⇆  Mg⁺² + 2Br⁻

The molarity of the magnesium ion will be equal to the M of the magnesium bromide and hence, will be 0.339 M.

The molarity of the bromide ions will be equal to two times the M of the magnesium bromide species and hence is 0.678 M.

Therefore, the molarity of the magnesium ion will be 0.339 M, and the Bromium ion will be 0.678M.

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Answer:

25 080 j    ( Rounded to 25100 j)

Explanation:

 FROM THE EQUATION

??  = 4.18  * 2000 * (3)  = 25 080 j

Answer:

increase

Explanation:

The Ideal Gas Equation

The volume of a gas is directly proportional to the number of moles it contains. Hence, if the number of particles is increased, then the volume inside the container will increase

Answer:

Structure 1:
The longest chain is made up of 4 carbons (butane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylbutane.

Structure 2:

The longest chain is made up of 7 carbons (heptane). There is a 2-carbon branch (ethyl). The lowest possible position of the branch is on the 4th carbon. This makes the alkane: 4-ethylheptane.

Structure 3:
The longest chain is made up of 4 carbons (butane). There are 2, 1-carbon branches (dimethyl). The lowest possible position of both branches is on the 2nd carbon. This makes the alkane: 2,2-dimethylbutane.

Structure 4:
The longest chain is made up of 3 carbons (propane). There are 2, 1-carbon branches (dimethyl). The lowest possible position of both branches is on the 2nd carbon. This makes the alkane: 2,2-dimethylpropane.

Structure 5:
The longest chain is made up of 6 carbons (hexane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylhexane.

Structure 6:
The longest chain is made up of 3 carbons (propane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylpropane.

The isomers are structures 1 and 4 because they contain the same amount of carbons (5) and hydrogens (12) while assuming different structures.

Answer:

B. Single replacement.

Explanation:

The A in compound AB was replaced by C to make CB. Since there was only one instance of replacement, it is a single replacement reaction.

So

Moles of Potassium

See molar ratio is same for K,KOH,H_2O i.e 4 .

Mass of Water

Mass of KOH

#2

Balanced already

3 mols of S form 3 mol SO_2

At STP 1mol=22.4L

Answer: As the substance changes from a liquid to a gas, bonds within its molecules almost dissapear and the average distance between them.

Explanation:

The number of moles of sodium chloride in (4.2 x 10⁻⁴¹) molecules of sodium chloride is 6.973 × 10⁻⁶⁵

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

1 mole is 6.022 × 10²³

[tex]1\; molecule = \dfrac{1}{6.023 \times 10^2^3}[/tex]

The given number of moles are 4.2 x 10⁻⁴¹

[tex]Moles = 4.2 \times 10^-^4^1 \times \dfrac{1}{6.023 \times 10^2^3} = 6.973 \times 10^{-65}[/tex]

Thus, the number of moles of sodium chloride in (4.2 x 10⁻⁴¹) molecules of sodium chloride is 6.973 × 10⁻⁶⁵

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Answer:

KCl+H2O

Na3PO+H2O

CaCO3+H2O

Answer:

3.711 L

Explanation:

The formula you need to use is the following:

[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\[/tex]

3.4L / 298 K = V2 / 273 K

V2 = 3.711 L