in which group and period of the periodic table is element y placed?​

Answer:

molar mass

Explanation:

Answer:

Is there a picture for it

Explanation:

because it would be a hard

Answer:

I think 11.1 degrees Celsuis

Explanation:

Let me know if i'm right coz im not too sure.

Answer:

The value of N would be 4.

Explanation:

The equation would be 2n^x = 32 and therefore, 4.

Answer:

28.16 g/mol

Explanation:

From Graham's law;

Let the rate of diffusion of gas X be 1.25

Let the rate of diffusion of CO2 be 1

Molecular mass of gas X= M

Molecular mass of CO2 = 44g/mol

1.25/1=√44/M

(1.25/1)^2 = 44/M

1.5625 = 44/M

M= 44/1.5625

M= 28.16 g/mol

Answer:

6

Explanation:

Electrons are floating around, and protons are outside of the nucleus center. The ones in the center are neutrons. I hope this helps.

Explanation:

just use the molar ratios to figure it out. Notice, you have to balance the chemical equation.

Answer:

[tex]1 \: mole \: of \: sulphurdioxide \: weighs \: 64 \: g \\ 0.850 \: moles \: will \: weigh \: (0.850 \times 64) \: g \\ = 544 \: g[/tex]

The mass of 0.85 mol of sulfur dioxide has been 54.4 grams.

Moles can be calculated as the ratio of the mass to the compound to the molecular mass. The moles can be expressed as:

Moles = [tex]\rm \dfrac{mass}{molecular\;mass}[/tex]

Mass = moles [tex]\times[/tex] molecular mass

The molecular mass of sulfur dioxide = Mass of sulfur + 2 [tex]\times[/tex] mass of oxygen

= 32 + 2 [tex]\times[/tex] 16

= 32 + 32

= 64 g/mol

The given moles of sulfur dioxide = 0.850 mol

The mass of sulfur dioxide = 0.850 [tex]\times[/tex] 64

The mass of sulfur dioxide = 54.4 grams.

The mass of 0.85 mol of sulfur dioxide has been 54.4 grams.

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Answer:

d sguro

Explanation:

I'm not sure kung ayan ba

ahí esta la respuesta espero que te sirva

Answer:

alloy,copper,gold, silver,cobalt

Explanation:

Answer:

A

Explanation:

Alkanes undergo substitution reaction with halogen molecules in the presence of light. This reaction occurs by free radical mechanism and the initiation step is the formation of the halogen radical.

The propagation steps involves the abstraction of a hydrogen from the alkane by the halogen radicals.

The termination steps involves the coupling of alky radicals.

Thus for the reaction of ethane and chlorine;

C2H6 + Cl2 -------> C2H5Cl + HCl

Answer: The correct options are A, C and D.

Explanation:

Enthalpy of formation is defined as the change in the enthalpy when 1 mole of a chemical substance is formed from its pure element at standard conditions. It is represented by the symbol [tex]\Delta H_{f}[/tex]

Enthalpy of formation for elemental atoms is always equal to 0.

We know:

Bromine (Br) exists in a liquid state.

Helium (He) exists in a gaseous state.

Mercury (Hg) exists in a liquid state.

Chlorine (Cl) exists in a gaseous state.

Nitrogen (N) exists in a gaseous state.

For the given options:

The [tex]\Delta H_{f}[/tex] for [tex]Br_2(l), Hg(l)\text{ and }Cl_2(g)[/tex] will be equal to 0 because they are formed by the natural states of their elemental atoms.

Hence, the correct options are A, C and D.

A substance in its standard state has an enthalpy of formation of 0 kJ/mol.

The enthalpy of formation of a substance in its standard state is 0 kJ/mol.

The standard state of a substance refers to its state at 1 atm and at a temperature of 298 K. Bearing this in mind, we can now identify the true and false statements.

So,

ΔHf for Br2(I) is 0 kJ/mol - True

ΔHf for He(I) is 0 kJ/mol - False

ΔHf for Hg(I) is 0 kJ/mol - True

ΔHf for Cl2(g) is 0 kJ/mol - True

ΔHf for  N2(I) is 0 kJ/mol - False

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Answer:

it would be option A

Explanation:

This is becuase if you look at the chart you can see tyhat the group of rats that got feed to vitamans did gain more wati then the ones on the normal diet.

Explanation:

so for this one you know 92.24 is the mass of C so to work out the mass of hydrogen u so 100-92.24=7.76

so

C : H

92.24/12 : 7.76 /1

7.68 : 7.76

so 7.76÷7.68=1.01

so CH

12+1=13

78.12÷13=6.009

so CH×6= C6H6

hope this helps:)

Answer:

(2) Ammonia I hope you good luck

(1) aluminum

Let's look at all the options first:

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Answer:

C. The weak nuclear force is greater than the strong nuclear force

Answer: The chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]

Explanation:

An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).

The element losing electron (metal) forms a positive ion known as a cation while the element gaining electron (non-metal) forms a negative ion known as an anion.

Element X has the atomic number 11 which is sodium. The electronic configuration of it is [tex]1s^22s^22p^63s^1[/tex]

This element will lose 1 electron to form [tex]X^+[/tex] ion of [tex]Na^+[/tex]

Chlorine has the atomic number 17. The electronic configuration of it is [tex]1s^22s^22p^63s^23p^5[/tex]

This element will gain 1 electron to form [tex]Cl^-[/tex] ion

When these two ions combine, they lead to the formation of an ionic compound having a chemical formula of [tex]XCl[/tex] or [tex]NaCl[/tex]

Hence, the chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]

Answer:

D. Point into Leaf: water(H₂O), carbon dioxide (CO₂) sunlight, Point away from leaf: Sugars, oxygen (O₂)

Explanation:

Photosynthesis is the process used in the production of chemical energy in the form of energy containing organic compounds and oxygen from atmospheric carbon dioxide and liquid water enabled with the energy captured from light (mainly Sunlight) by the chlorophyll in green plants and other organisms

The basic chemical reaction involved in a photosynthesis reaction is presented as follows;

[tex]{}[/tex]                                    Sunlight

[tex]{}[/tex]                                          ↓

[tex]{}[/tex]       CO₂           +  H₂O (l)  →   C₆H₁₂O₆   +    O₂

Carbon dioxide [tex]{}[/tex]  Water        Glucose       Oxygen    

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The amount of water is the independent variable in this experiment.

Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria). By one definition, plants form the clade Viridiplantae (Latin name for "green plants") which is sister of the Glaucophyta, and consists of the green algae and Embryophyta (land plants). The latter includes the flowering plants, conifers and other gymnosperms, ferns and their allies, hornworts, liverworts, and mosses.

Most plants are multicellular organisms. Green plants obtain most of their energy from sunlight via photosynthesis by primary chloroplasts that are derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic or mycotrophic and have lost the ability to produce normal amounts of chlorophyll or to photosynthesize, but still have flowers, fruits, and seeds. Plants are characterized by sexual reproduction and alternation of generations, although asexual reproduction is also common.

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water is to gas as liquid is to solid

Answer: The balanced nuclear equation for the alpha decay of Sr-90 is [tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\alpha[/tex]

Explanation:

A nuclear reaction is defined as the reaction in which the changes in the nucleus of an atom take place and usually form a different element. The types of decay processes are:

Alpha decay is the process in which a heavy nucleus decays into a light nucleus with the release of an alpha particle. This alpha particle carries a charge of +2 units and has a mass of 4 units. It is also known as the helium nucleus. The general equation for this decay process is:

[tex]X_Z^A\rightarrow Y_{Z-2}^{A-4}+\alpha _2^4[/tex]

The nuclear equation for the alpha decay of strontium-90 isotope follows:

[tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\alpha[/tex]

Answer: The correct net ionic equation for the reaction is [tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]

Explanation:

Net ionic equation is defined as the equations in which spectator ions are not included.

Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.  

The balanced molecular equation is:

[tex]Ca(OH)_2(aq)+H_2SO_4(aq)\rightarrow CaSO_4(aq)+2H_2O(l)[/tex]

The complete ionic equation follows:

[tex]Ca^{2+}(aq)+2OH^-(aq)+2H^+(aq)+SO_4^{2-}(aq)\rightarrow 2Ca^{2+}(aq)+SO_4^{2-}(aq)+H_2O(l)[/tex]

As calcium and sulfate ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

[tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]

Hence, the correct net ionic equation for the reaction is [tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]

Answer:

B. no reaction     

Explanation:

Answer:

Intermolecular bonds become weaker

Melting

Temperature increases

Molecules vibrate faster

Explanation:

In the solid phase, intermolecular forces are found to be strongest. However, as the temperature is increased, the molecules of the solid begin to vibrate faster and intermolecular forces between them begin to weaken.

As intermolecular forces of a substance become weaker, the substance melts. The molecules in the liquid state possesses greater kinetic energy than the molecules in the solid state.

Hence the the answer above.

Answer:

B, C, F, and H

Explanation:

These are all things that happen in the increase of the kinetic energy of particles in a solid.

B. Intermolecular bonds become weaker

C. Melting

F. Temperature increases

H. Molecules vibrate faster

Also, just took the test and got it right.

Answer: The correct answer is heat will flow from the boiling water into the frozen metal.

Explanation:

According to the law of conservation of energy, energy cannot be destroyed nor created but it can be transformed from 1 form to another form.

There are 3 processes of heat transfer:

The heat moves from a hot surface to a cold surface to maintain equilibrium.

We are given:

A metal is placed in a freezer (cold object) and another metal is placed in an oven (hot object) and then both the metals are placed in boiling water.

Initially, the heat will flow from the boiling water (hot object) into the frozen metal (cold object) to maintain equilibrium

Hence, the correct answer is heat will flow from the boiling water into the frozen metal.

Answer:A

Explanation:

Option D. They all have extremely long half-lives makes radioisotopes useful for dating objects.

Radioisotopes exist as radioactive isotopes of an element. They can also be described as atoms that include an unstable combination of neutrons and protons, or surplus energy in their nucleus.

A radionuclide exists as a nuclide that contains excess nuclear energy, causing it unstable. This excess energy can be utilized in one of three methods: emitted from the nucleus as gamma radiation; assigned to one of its electrons to terminate it as a conversion electron; or utilized to create and emit a unique particle from the nucleus.

Radioactive isotopes of radium, thorium, and uranium, for example, exist found naturally in rocks and soil. Uranium and thorium also happen in trace amounts in water. Radon, induced by the radioactive decay of radium, stands present in the air.

Hence, Option D. They all have extremely long half-lives makes radioisotopes useful for dating objects.

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