Enter a balanced chemical equation for the reaction of solid rubidium with liquid water.

Models can show us specifically how atoms of a substance are arranged and connected on the atomic level.

Atomic models is defined as a graphic representation of the structure of an atom which shows that it contains a nucleus made up of proton and neutrons and has an electron revolving round around it.

The first scientist that proposed the description of the inner structures of an atom is William Thomson in 1900.

Other scientist that carries out works on the atomic structure to produce a model include the following:

Therefore, Models are important in makeup of substances on the atomic level because it can show us specifically how atoms of a substance are arranged and connected on the atomic level.

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The statement that explains what must be done the observe the chemical property of a substance is as follows: Change it into a different substance (option A)

The chemical property of a substance is any of a material's properties that only becomes evident during a chemical reaction.

Chemical reaction is a reaction that typically involves the breaking or making of interatomic bonds, in which one or more substances are changed into others.

This suggests that chemical properties cannot be observed via change of state or phase but can only be observed when the substance changes into a different substance i.e. undergo a chemical reaction.

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Answer:

Option 3

Explanation:

Because electrons have the same charge, they repel. So, if possible, the electrons should be in different orbitals.

Correct option is 3 for the arrangement for a 2p sublevel with only 3 electrons.

Atomic orbitals unite to generate an equal number of hybrid orbitals during the formation of certain compounds, a process known as orbital hybridization. In terms of both atomic theory and quantum physics, an atomic orbital is a function that explains the location and wave-like activity of an electron in an atom.

The probability of finding an electron in any atom in any region around the nucleus may be calculated using this function. A mathematical function known as a molecular orbital can be used to describe the location and wave-like activity of an electron inside a molecule.

This function may be used to determine chemical and physical attributes such as the probability of finding an electron in a specific region. In addition to being entirely destroyed, orbital bombardment also does damage to any army.

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Ammonia (NH3) and hydrogen peroxide (H2O2) can react to form Nitrogen (N2), water (H2O), nitric oxide (NO), and some amount hydrogen (H2) and oxygen (O2). Overall, the reactions involved are exothermic. Ammonium is a cation (NH4+), the conjugate weak acid from ammonia (NH3)

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The formulae of the metal according to the law of multiple proportions are XCl₂ and XCl₃, and X is Fe so FeCl₂ and FeCl₃

We have the two chlorides that are XyClw and XyClz. We have to show that the ratios w to z are in small whole numbers.

Compound A = 12.7 g X and 7.1 g Cl, then X must be 5.56 g

Compound B = 16.3 g X and 10.7 g Cl, then X must be 5.56 g.

7.1 x (12.7/16.3) = 5.53 g Cl for each gram of X

10.7 x (12/7/16.3) = 8.34 g Cl for each gram of X. Then what is the ratio of the two Cl numbers: Now, divide both numbers by the smaller one. That is

5.53/5.53 = 1.00

8.34/5.53 = 1.508.

Rounding off 1.508 to 1.50, then you can see that 1.0 to 1.5 is actually 2 to 3 and those are small whole numbers. Within experimental error, the law of multiple proportions is proved to be true.

The compounds must be XCl₂ and XCl₃, and X is Fe so FeCl₂ and FeCl₃ are the compounds.

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According to Avogadro, one mole of a material consists :

6.022x10∧23 atoms. Avogadro's number is this. Use dimensional analysis to determine the number of atoms present in two moles of sodium.

Na x 2.0 moles

6.022⋅10

23g1

mol=1.20

10.24 Na atoms.

The mass of 6.022 10 23 atoms, molecules, or formula units make up one mole of a material, which is known as the molar mass. This value is given in grammes per mole.

The SI unit for calculating a material's amount is the mole. It is symbolised by the letter mol. The volume of material that includes the same number of distinct things is another name for it. The molar mass of a substance is its mass expressed in grammes per mole.

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At 1 atmosphere and 20 degrees Celsius, all samples of H₂0(l) must have the same density.

The correct option is B.

The atmosphere of a globe or other celestial body refers to the layers of gases that surround it. Nitrogen makes up around 78% of the chemicals in the Earth's atmosphere, followed by oxygen at 21% and other gases at 1%.

It not only shields us from harmful UV solar radiation but also gives us the oxygen we need to survive. Without it, our planet could not sustain the pressure required for liquid water to exist on its surface. It also maintains the planet's temperature and the conditions necessary for life to exist.

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Answer:

Probably because there is more helium to burn. After billions of years there's only gonna be helium so no more of that firey energy.

I think....

The total solids is 300 mg/L, volatile solids is 80 mg/L, total suspended solids is 224 mg/L, total dissolved solids is 76 mg/L and the volatile suspended solids is 26.66 mg/L

The data we have is

Mass of evaporating dish, Mtare = 24.1520 g

sample volume V = 150 ml

As per the question

a) Total solids = All the solids present whether suspended or dissolved

= [(Mtare+solids - Mtare) x 1000mg x 1000ml ] / V

= [24.1970 - 24.1520] x 10^(6) / 150

= 300 mg/L

b) Volatile solids = portion of solids which are volatized at 550 C

= [(Mtare+solids - Mtare+ash)] x 10^(6) / V

= 24.1970-24.1850 x 10^(6) / 150

= 80 mg/L

c) Total suspended solids = solids that are non-filterable with specified filters and are not volatilized at 105 C

= [Msus solids+ tare +filter - Mtare+filter x 10^(6)] / V

= 1.4939 - 1.4603 x 10^6 / 150

= 224 mg/L

d) Volatile suspended solids = portion of suspended solids which are volatilized at 550C

= Mss+Tare+filter - Mresidue+Tare+filter x 10^(6) / V

= [1.4939 - 1.4899 x 10^(6)] / 150

= 26.66 mg/L

e) Total dissolved solids = solids which are present in solution and filterable

=(Total solids - total suspended solids)

= (300 - 224)

= 76 mg/L

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The order of decreasing rate of effusion of gases is as follows :Hydrogen, Neon, Oxygen, and Argon.

Rate of Effusion :

The rate of effusion is inversely proportional to the square root of the molecular mass and the rate of effusion of a gas is directly proportional to the speed of the movement of gas.

It can be mathematically expressed as

         rate of effusion ∝   1  

                                       √M  

This means that if two gases are at same pressure and temperature, the ratio of their rate of effusion is inversely proportional to ratio of square roots of mass. So, lighter gases will diffuse more quickly. The molecular masses of the gases are,

molecular mass of H₂= 2 g

molecular mass of O₂ =32 g

molecular mass of Ar = 39.94 g

molecular mass of Ne = 20.17 g

If we take ratios of these, for example between hydrogen and oxygen -

rate of effusion of hydrogen = √32 = 4

rate of diffusion of oxygen        √2       1

Hydrogen effuses four times more rapidly than oxygen.

The rate of effusion is highest in Hydrogen and lowest in Argon.

The order of decreasing rate of effusion of gases is as follows:

Hydrogen, Neon, Oxygen, and Argon.

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The correct answer is MgH2.

In most cases, a metal reacting with a non-metal results in the formation of ionic compounds. As is common knowledge, metals always contain extra electrons on their outermost shells while non-metals never do. Metals thus transfer their electrons to non-metals, allowing both to reach the required octave.

Mg, a metal, contains two electrons in its outermost valence shell (E.C-2, 8, 2), while hydrogen, a gas, only has one electron in its outermost shell in the compound MgH2 (E.C- 1). As a result, Mg receives two electrons, achieving its stable state and satisfying the octet rule. On the other side, hydrogen gets one electron per atom, achieving the electrical structure of helium and becoming stable.

MgH2 is an ionic compound as a result.

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Acids i think... because I know for sure H3PO4 is a acid and so is Hbr...

Answer:

B. Acids

Explanation:

All of them are acids because H3PO4 is phosphoric acid, HBr is hydrobromic acid, H2SO4 is sulfuric acid, and HNO3 is nitric acid.

Pls. give me a lot of points I took a lot of time to help you. :)

Answer:

1g/

Explanation:

density=mass÷volume

5g÷5ml

1g/m

Answer:

This question is to vague. PS: what are you talking about?

Explanation:

This question is to vague. PS: what are you talking about?

Solution would be 0.88mol/l.

Solution is a homogeneous mixture of a one or more solutes dissolved in a solvent.

solvent: substance in which solute dissolves to produce a homogeneous mixture

solute: substance that dissolves in solvent to produce a homogeneous mixture

Note that solvent is the substance that is present in greatest amount.

Many different kinds of the solutions exist, for example, a solute can be a gas, a liquid or a solid. Solvents can also be the gases, liquids or solids.

Life processes depend in the large part on solutions. Oxygen from lungs goes into solution in blood plasma, unites chemically with the hemoglobin in the red blood cells, and is released to the body tissues. The products of digestion also are carried in the solution to the different parts of the body.

The ability of liquids to dissolve the other fluids or solids has many practical applications. Chemists take the advantage of differences in solubility to separate and purify materials and to carry out chemical analysis. Most chemical reactions occur in the solution and are influenced by the solubilities of the reagents. Materials for chemical manufacturing equipment are selected to resist solvent action of their contents.

Solution would contain 30g h2o2 per 1000g of solution. Since the molecule of h2o2 is 34g/mol then 30g would be,

30g/(30g/mol) = 0.88mol

So the solution would be 0.88mol/l.

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The conversion of density of a red solution is 1.31 g/ml  to [tex]pound/inch^{3}[/tex] is 0.0473 [tex]pound/inch^{3}[/tex].

The density of red solution = 1.31 g/ml = 0.00131 kg / [tex]cm^{3}[/tex]

1ml = 1[tex]cm^{3}[/tex]

2.205 pounds = 1kg

so, 0.00131 kg / cm3 = 0.00131 × 2.205 pounds / cm3

2.54 cm = 1 inch

1 l = 1.056 quarts.

now, from the above values,

1.31 g/ml = ( 0.00131 × 2.205) pounds /[tex]cm^{3}[/tex] × (2.54 cm / inch )3

              =   0.0473 pound / [tex]cm^{3}[/tex]

thus, we get the required conversion from g/ml to pounds / inch3.

Therefore,The conversion of density of a red solution is 1.31 g/ml  to [tex]pound/inch^{3}[/tex] is 0.0473 [tex]pound/inch^{3}[/tex].

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Carbon is very useful in molecules for living things because:  Carbon is produced in photosynthesis and carries the energy needed for life.

Photosynthesis is the process of synthesizing one's own food using the inorganic raw materials like sunlight energy, water and carbon dioxide to form food in the form of sugars and releasing oxygen as a by-product. The food synthesized by photosynthesis of an organic carbon compound which is then transferred to further species of the food chain.

Energy is the most essential requirement for living organism's to perform all the life processes inside the body. This energy is derived by the ingested food which is formed of carbon atom. This demonstrates the usefulness of carbon for living things.

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The cake should weigh 265 grams ordinarily. However, it could weigh less.

According to the law of conservation of mass, masses can neither be created nor destroyed during the course of chemical reactions. However, masses can be converted from one form to another.

Going by this law, the mass of the resulting cake from the illustration should be the cumulative mass of the ingredients of the cake.

However, during the process of baking, some mass might have been converted to gas and escaped into the atmosphere. Thus, the final cake may weigh less than the cumulative mass of the ingredients.

In the absence of conversion of mass to gas and no ingredient spillage during the entire process, the mass of the cake should be the cumulative mass of the ingredients.

Thus:

Mass of the cake = 150 + 70 + 45

                            = 265 grams

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The surface area of a square piece of paper has an edge measuring 7.06cm is 49.84 cm2

The surface area of an object is the total area of the object that it occupies. It can be measured by adding all the sides of the object.

The surface area of a square is

side x side

Given the sides of the square is 7.06 cm.

This is a square, so all squares have the same size sides. So by putting the values in the equation, we can occupy the surface area of the square.

7.06 x 7.06 = 49.84

Therefore, the surface area of a square piece of paper is 49.84 cm2

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20 ml of peroxide will be used if an order calls for a wound irrigation with 100 ml of a mixture of hydrogen peroxide and normal solution at 1:4 ratio.

Simple maths

100 ml of a mixture of hydrogen peroxide and normal solution at 1:4

add 1 + 4 gives 5

hydrogen peroxide = 1/5 of the 100ml solution

                                 = 20 ml

Hydrogen peroxide is a mild antimicrobial that can be used straight to the skin for small burns, scrapes, and wounds. Additionally, it can be used as a mouthwash to ease minor mouth irritation (induced, for instance, by canker/cold sores, gingivitis) or to help remove mucus.

This product works by releasing oxygen into the affected region when it is applied. The oxygen is produced, which causes foaming, which aids in cleaning the area by removing dead skin. Animal bites, severe burns, and deep wounds shouldn't be treated with this drug.

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Yes,  the pelvic bone support the intestines.

The pelvis, also known as the bony pelvis or the pelvic girdle, is a complex of bones that connects the trunk to the legs, supports and balances the trunk, and houses and supports the intestines, urinary bladder, and internal sex organs. It is also known as the "basin" or "bony pelvis" in human anatomy.

Major organs are located in the pelvic region, hidden by layers of muscles. The primary digestive organs, the intestines, are some of the most crucial. Bloating, constipation, or diarrhea, which are IBS symptoms, can cause pressure and pain in the pelvic area.

Therefore, yes the pelvic bone support the intestines.

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Based on measurements, the following statements are described as True or False:

1. Weight is a measure of the pull of gravity on an object is True.

2. Scientists use English units of measurement is False.

3. The prefix centi- stands for one hundredth (1/100) is True.

4. A graduate is used to measure mass is False.

5. The basic unit of length in the metric system is the meter is True.

6. Volume is a measure of the amount of matter in an object is False.

7. One kilogram is less than one gram is False.

8. A measurement has two parts is True.

9. A unit is an amount used to measure something is True.

10. Most countries use the metric system. is True.

The weight of a substance is the pull of the gravity on the body.

The weight of a body is the product of the mass of the body and the acceleration due to gravity.

In measurements of the the properties of objects, the universally accepted unit used by scientists is the SI Units of measurement.

The prefix centi-  used in measurements such  as centimeter stands for one hundredth (1/100).

When measuring the mass of an object, a balance is used to measure the mass.

The basic unit of length in the metric system is the meter.

Mass is a measure of the amount of matter in an object whereas volume is the amount of space a given mass of the object occupies.

The unit of measuring mass is kilogram. One kilogram is equal to 1000 grams.

A measurement has two parts; a number and the unit. For example, mass of 2 kg.

A unit is an amount or value used to measure something.

Most countries use the metric system with some few exceptions such as the US.

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Elements in the same group share many chemical and physical properties, such as the follows:

Elements are the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.

Elements are arranged in order of their atomic number on the periodic table. The periodic table is arranged in groups (vertical columns) and periods (horizontal rows).

Elements in the same group possess the same chemical properties, which include;

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The components of substances that are ionically bonded separate when the substance is placed in water.

Water is an excellent solvent due to its polarity and its ability to for the hydrogen bonds. Because of this property, different substances dissolves and get separated in the water which are ionically bonded.

Ionically bonded compounds separates in the water because the molecules of water hydrate the ions. To separate an ionically bonded compound, the water molecules should be able to stabilize the ions. This stability results from breaking the ionic bonds. They do this by hydrating the ions.

Water is a polar molecule and has a permanent dipole moment. The oxygen atom has a partial negative charge and the hydrogen atoms have a partial positive charge. The water molecules attracts the positive and negative ions, when an ionic substance is placed in water.

The positive ions have several water molecules around them, and oxygen atoms are close to the positive ion. The negative ions have several water molecules around them, and hydrogen atoms are close to the negative ion.

The water molecules reduces attractions between the ions resulting in the weakening of ionic bond which results in the hydration of ions.

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a)Elements that form hydrides by electrovalent binding are Sodium(Na), and Magnesium (Mg).

b)None of the elements is used to catalyze a chemical reaction and the elements that catalyze the reaction are platinum, cobalt, and iron.

c)Elements used in are radioactive dating  [tex]C^{14}[/tex]

d)The element which forms acid anhydride is phosphorous (P).

e)The element that exhibits both metallic and non-metallic behavior is Metalloids.

The tabular display of chemical elements is the periodic table, Which contains 18 periods and 7 groups.

All the elements are configurable in the S, P, D, and F blocks.

S and D block elements mostly contain metals, and P- block contains non-metals and Metalloids.

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One isotope of a metallic element has the mass number 64 and 34 neutrons in the nucleus. the cation derived from the isotope has 28 electrons. So the atomic number will be 30.

Mass number of isotope = 64

Number of neutrons = 34

So number of protons = 64 - 34 = 30

Hence atomic number of metal = 30

Thus metal is = zinc

Now as it is forming cation with 28 electrons it means it has lost two electrons so it must have a dipositive charge.

The symbol of metal ion will be Zn^+2

The number of protons in an atom's nucleus or the number of electrons in an electrically neutral atom is the atomic number of that atom. An atom of sodium, for instance, has 11 protons and 11 electrons. Therefore, the atomic number of the Na atom is equal to the sum of its protons and electrons, or 11.

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The mole fraction of hydrogen is 0.55.

The volume of oxygen = 5 litres

The pressure of oxygen = 2 atm

The volume of hydrogen = 3 litres

The pressure of hydrogen = 4 atm

The universal gas constant is R.

R = 8.31 J mol—¹ K—¹

The ideal gas equation is,

PV = nR T

The number of moles of oxygen is,

PV = nRT

[tex]n = \frac{ PV }{RT }[/tex]

[tex]n = \frac{2 \times 5}{8.31 \times 273} [/tex]

n = 0.004 moles

The number of moles of oxygen is 0.004 moles.

The number of moles of hydrogen is,

PV = nRT

[tex]n = \frac{ PV }{RT }[/tex]

[tex]n = \frac{4 \times 3}{8.31 \times 273} [/tex]

n = 0.005 moles

The number of moles of hydrogen is 0.005 moles.

The mole fraction of hydrogen is,

[tex]Mole \: fraction = \frac{ Moles \: of \: solute }{Total \: number \: of \: moles \: of \: solute \: and \: solvent}[/tex]

[tex]Mole \: fraction = \frac{0.005}{0.009}[/tex]

= 0.55

Therefore, the mole fraction of hydrogen is 0.55.

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Answer:

What represents the average kinetic energy of the molecules of any gas? Choose the correct answer.

=Temperature

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