Name the gas evolved when Zn reacts with dil.HCI (choose the answer from the following)
1. O2 2. H2 3. CO2 4. Cl2

Answer:

Excited state of an electron is the state attained by an electron after it has absorbed energy and it moves further from the nucleus.

an electron is at higher energy when excited and at lower energy when at ground state.

an excited electron is less stable due to the decrease in the nuclear force of attraction and the grounded electron is more stable due to it's close distance to the nucleus.

An electron in excited state has its electron present in higher energy level while an electron in ground state is present in lower energy level.

Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.

Energy of the stationary state is given as E= -R

1/n² where R

is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.

They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.

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Answer:

it is b because its releases heat in to all directions and not b because it staying inside and not releasing anything :)

Explanation:

Answer:

In ice cube heat is taken in absorbed it's an endothermic reaction

In fire heat is given out it is an exothermic reaction

Explanation:

Wanna give you one advice

Exit of heat means exothermic and you can memorize it by

The first word of both word exit ;exo

Hope it helps you

Answer:

3.40% corrected to 1dp

Explanation:

78.4-75.7=2.7

percentage error = error/original value× 100

= 2.7/78.40×100

= 3.44387755102040

= 3.40% corrected to 1dp

Answer:

i think it is C

Explanation:

sorry if wrong

Answer:

Key Points

Viral replication involves six steps: attachment, penetration, uncoating, replication, assembly, and release.

During attachment and penetration, the virus attaches itself to a host cell and injects its genetic material into it.

Answer: 3:2

Explanation: (10.14÷3.38)÷(8.42÷4.21)=1.5=3/2

Answer:

Which indicates that thermal energy is no longer being transferred from boiling water to a mug?

The mug and the water lose all thermal energy.

The water is hotter than the mug.

The mug is hotter than the water.

•The water and the mug are the same temperature.

Explanation:

answer #D is correct

When the water and the mug are at the same temperature then thermal energy will no longer be transferred from the boiling water to the mug. Therefore, option (D) is correct.

Thermal energy is generated in a substance when an increase in temperature causes atoms and molecules to move at a faster speed and result in the molecules colliding with each other. The energy generated from the temperature of the heated material is called thermal energy.

Thermal Energy or internal kinetic energy is because of the random motion of molecules in the system. The thermal energy of any system is directly proportional to its temperature.

The more the temperature of the system, the more the movement of molecules within a given system, and the more the thermal energy of the system.

The thermal energy will be transferred from the boiling water to the mug when the water is hotter than the mug. When both have the same temperature then the thermal energy is no longer being transferred from boiling water to a mug.

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Answer:

The statement that is true is:

II. Scientific explanations should be based on evidence or data.

                                                                                     ~Lylliara Jackson~

Answer:

answer questions brain

Answer:

c

Explanation:

Answer:

A. a best guess explanation

Explanation:

A scientific theory explains why something behaves the way it does and is usually backed up by different sources. They are not speculations and can be proven. Those which are speculations and are not proven are called hypothesis. A scientific theory can also be replaced, if it is found that it does not produce valid results, or if a better theory is proposed which is made of one or more old theories.

Answer:

3.5: Ionic Compounds- Formulas and Names

Last updatedAug 25, 2020

3.4: An Atomic-Level Perspective of Elements and Compounds

3.6: Molecular Compounds- Formulas and Names

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6.9: Binary Ionic Compounds and Their Properties

6.18: Ionic Compounds Containing Polyatomic Ions

Learning Objectives

Derive names for common types of inorganic compounds using a systematic approach

Nomenclature, a collection of rules for naming things, is important in science and in many other situations. This module describes an approach that is used to name simple ionic and molecular compounds, such as NaCl, CaCO3, and N2O4. The simplest of these are binary compounds, those containing only two elements, but we will also consider how to name ionic compounds containing polyatomic ions, and one specific, very important class of compounds known as acids (subsequent chapters in this text will focus on these compounds in great detail). We will limit our attention here to inorganic compounds, compounds that are composed principally of elements other than carbon, and will follow the nomenclature guidelines proposed by IUPAC. The rules for organic compounds, in which carbon is the principle element, will be treated in a later chapter on organic chemistry.

Ionic Compounds

To name an inorganic compound, we need to consider the answers to several questions. First, is the compound ionic or molecular? If the compound is ionic, does the metal form ions of only one type (fixed charge) or more than one type (variable charge)? Are the ions monatomic or polyatomic? If the compound is molecular, does it contain hydrogen? If so, does it also contain oxygen? From the answers we derive, we place the compound in an appropriate category and then name it accordingly.

Compounds Containing Only Monatomic Ions

The name of a binary compound containing monatomic ions consists of the name of the cation (the name of the metal) followed by the name of the anion (the name of the nonmetallic element with its ending replaced by the suffix –ide). Some examples are given in Table  3.5.2 .

Table  3.5.1 : Names of Some Ionic Compounds

NaCl, sodium chloride Na2O, sodium oxide

KBr, potassium bromide CdS, cadmium sulfide

CaI2, calcium iodide Mg3N2, magnesium nitride

CsF, cesium fluoride Ca3P2, calcium phosphide

LiCl, lithium chloride Al4C3, aluminum carbide

Compounds Containing Polyatomic Ions

Compounds containing polyatomic ions are named similarly to those containing only monatomic ions, except there is no need to change to an –ide ending, since the suffix is already present in the name of the anion. Examples are shown in Table  3.5.2 .

Table  3.5.2 : Names of Some Polyatomic Ionic Compounds

KC2H3O2, potassium acetate (NH4)Cl, ammonium chloride

NaHCO3, sodium bicarbonate CaSO4, calcium sulfate

Al2(CO3)3, aluminum carbonate Mg3(PO4)2, magnesium phosphate

Ionic Compounds in Your Cabinets

Ionic Compound Use

NaCl, sodium chloride ordinary table salt

KI, potassium iodide added to “iodized” salt for thyroid health

NaF, sodium fluoride ingredient in toothpaste

NaHCO3, sodium bicarbonate baking soda; used in cooking (and as antacid)

Na2CO3, sodium carbonate washing soda; used in cleaning agents

NaOCl, sodium hypochlorite active ingredient in household bleach

CaCO3 calcium carbonate ingredient in antacids

Mg(OH)2, magnesium hydroxide ingredient in antacids

Al(OH)3, aluminum hydroxide ingredient in antacids

NaOH, sodium hydroxide lye; used as drain cleaner

K3PO4, potassium phosphate food additive (many purposes)

MgSO4, magnesium sulfate added to purified water

Na2HPO4, sodium hydrogen phosphate anti-caking agent; used in powdered products

Na2SO3, sodium sulfite preservative

Table  3.5.3 : Names of Some Transition Metal Ionic Compounds

Transition Metal Ionic Compound Name

FeCl3 iron(III) chloride

Hg2O mercury(I) oxide

HgO mercury(II) oxide

Cu3(PO4)2 copper(II) phosphate

Naming Ionic Compounds

Name the following ionic compounds, which contain a metal that can have more than one ionic charge:

Fe2S3

CuSe

GaN

CrCl3

Ti2(SO4)3

Solution

The anions in these compounds have a fixed negative charge (S2−, Se2− , N3−, Cl−, and  SO2−4 ), and the compounds must be neutral. Because the total number of positive charges in each compound must equal the total number of negative charges, the positive ions must be Fe3+, Cu2+, Ga3+, Cr4+, and Ti3+. These charges are used in the names of the metal ions:

iron(III) sulfide

copper(II) selenide

gallium(III) nitride

chromium(III) chloride

titanium(III) sulfate

Exercise  3.5.1  

Write the formulas of the following ionic compounds:

(a) chromium(III) phosphide

(b) mercury(II) sulfide

(c) manganese(II) phosphate

(d) copper(I) oxide

(e) chromium(VI) fluoride

Answer

(a) CrP; (b) HgS; (c) Mn3(PO4)2; (d) Cu2O; (e) CrF6

Explanation:

The given compound is francium sulfate.

Explanation:

While naming ionic compounds :

Given

The molecule formula of a compound[tex]Fr_2SO_4[/tex]:

To find:

The name of the given compound formula

Solution:

Cation in formula = [tex]Fr^+[/tex] = Francium cation

Anion in the formula= [tex]SO_4^{-2}[/tex] = Sulfate anion

So, the name of the given compound is francium sulfate.

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Answer:

Inner space

Explanation:

I hope this helps

Answer:

A) In aldehydes, the carbon is always joined to at least one hydrogen atom.

Explanation:

Aldehydes and Ketones are organic compounds.

The main difference between them is that aldehydes have the carbon atom attached to at least one hydrogen atom.

In ketones, the carbon is attached to another carbon.

To reiterate, the striking difference between the two families is that in alkanals, a hydrogen atom is directly attached to the carbonyl group while in alkanones, no hydrogen atoms is attached to the carbonyl group but two bulky alkyl groups.

Answer:

Biogas is a type of biofuel that is naturally produced from the decomposition of organic waste. When organic matter, such as food scraps and animal waste, break down in an anaerobic environment (an environment absent of oxygen) they release a blend of gases, primarily methane and carbon dioxide.

Explanation:

Biomass is renewable organic material that comes from plants and animals. ... Biomass contains stored chemical energy from the sun. Plants produce biomass through photosynthesis. Biomass can be burned directly for heat or converted to renewable liquid and gaseous fuels through various processes.biodigester is like a mechanical stomach. It is fed with organic material, which is broken down (decomposed) by micro-organisms (bacteria) is an oxygen-free (anaerobic) environment to produce a renewable energy called biogas (methane and carbon dioxide) and other material that is mainly used as fertilizer.

Explanation:

Biogas is a type of biofuel that is naturally produced from the decomposition of organic waste.

Biomass is plant or animal material used for energy production, or in various industrial processes as raw substance for a range of products.

A Biodigester simply means a tank which digests organic material biologically. In this sense, the FilterPod is a biodigester. However, many people think of a biodigester as a tank which digests, anaerobically, without air, organic material and produces methane gas for cooking, lighting and heating ect.

Explanation:

The lack of a control group

Answer:

ok whats the question dude just ask :PPPPPPPPPPPPPPPPPPPPPP

OTHERWISE EOEOEEOEOEOOEOEOEOEOEOOEOWOWOWOWOW

wow is mom upide down

Explanation:

Answer:

Atomic number of a chemical element is the number of protons found in the nucleus of every atom of that element.

The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus.

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom.

Answer:

[tex]O^{2-}[/tex] is the symbol for an oxide ion

Explanation:

Claim, Evidence, Reasoning (CER) model, an explanation consists of: A claim that answers the question. Evidence from students' data. Reasoning that involves a rule or scientific principle that describes why the evidence supports the claim.

Answer:

The statement which describes an intensive property of matter is - :

it is the same for every sample of a single substance.

Explanation:

Hence , the correct option is A (it is the same for every sample of a single substance).

Answer:

p =7

e = 7

n = 7

Explanation:

proton = atom number

electron = atom number - muatan

neutron = mass nimber - atomic number

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

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

From the question

mass = 20 g

density = 5 g/cm³

So we have

[tex]volume = \frac{20}{5} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

109.5

Explanation:

It's a tetrahedreal with four bonds

Answer:

From these two values, i.e. mass and volume, density of the copper cylinder can be calculated.

Formula of density is :

Density = Mass / volume.

Now we have mass: 53.76g and volume 6cm³

Density = 53.76 / 6

Density= 8.96 g/cm³

Answer:

1.69×10²⁹ molecules.

Explanation:

The following data were obtained from the question:

Mass of Ammonia (NH3) = 5.25 tons

Molecules of Ammonia (NH3) =.?

Next, we shall convert 5.25 tons to grams (g). This can be obtained as follow:

1 ton = 907184.74 g

Therefore,

5.25 ton = 5.25 ton × 907184.74 g / 1 ton

5.25 ton = 4762719.885 g

Therefore, 5.25 tons is equivalent to 4762719.885 g

Finally, we shall determine the number of molecules of ammonia, NH3 in 4762719.885 g. This can be obtained as follow:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules. This implies that 1 mole of ammonia, NH3 also contains 6.02×10²³ molecules.

1 mole of ammonia, NH3 = 14 + (3x1) = 14 + 3 = 17 g

17 g of ammonia, NH3 contains 6.02×10²³ molecules.

Therefore, 4762719.885 g of ammonia, NH3 will contain = (4762719.885 × 6.02×10²³) / 17 = 1.69×10²⁹ molecules.

From the calculations made above,

5.25 tons (4762719.885 g) of ammonia, NH3 contains 1.69×10²⁹ molecules.

you should

MOL × NA(Avogadro Constant)

Mol = 4

HNO3 = 5 Atome ( 1H + 1N + 3O)

NA = 6.02 × 10* ( * = 23)

[tex]4 \times 5 \times 6.02 \times {10}^{23} = 20 \times 6.02 \times {10}^{23} = 120.4 \times {10}^{23}atom [/tex]

Answer:

2.408 x 10^24

GREETINGS!

One mole of a substance is equal to 6.02 × 10²³ units of that substance. The number 6.022 × 10²³ is known as Avogadro's number.

so if one mole of molecule is equal to that number so,

                              for 4 moles of [tex]HNO_{3}[/tex]= 4 x ([tex]6.02x10^{23}[/tex])

so answer is,

                      2.408 x 10^24

HOPE IT HELPS YOU.

Answer:

1.3 g/cm3

Explanation:

Answer : The volume of kristas rock is 30 mL.

Explanation :

From the given image we conclude that:

Initial volume of liquid = 150 mL

Final volume of liquid = 180 mL

Now we have to determine the volume of kristas rock.

Volume of kristas rock = Final volume of liquid - Initial volume of liquid

Volume of kristas rock = 180 mL - 150 mL

Volume of kristas rock = 30 mL

Therefore, the volume of kristas rock is 30 mL.