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Answer:

B. a characteristic of a substance that can be measured or observed without changing the chemical identity of the substance

Explanation:

The definition of a physical property is " a property (as color, hardness, boiling point) of matter not involving in its manifestation a chemical change."

The only choice that matches this description fully is the second one, or B, so that is the answer.

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Answer:

It is already balanced

Explanation:

hbr     +    khco3  ===>  h20 + kbr + co2     IS BALANCED

The name of the compound by using the IUPAC nomenclature of organic compounds is 1 -octene. The correct option is the last option - 1-octene.

From the question, we are to determine the name of the given molecule.

To name the compound, we will follow the IUPAC rules.

Some of IUPAC rules are

The given compound has 8 carbons and a double bond. The root name of the compound is octane.

By IUPAC rules, the compound is an Octene.

Since the double bond is between carbon-1 and carbon-2. The compound becomes 1-octene.

Hence, the name of the compound by using the IUPAC nomenclature of organic compounds is 1 -octene. The correct option is the last option - 1-octene.

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The diagram for the compound is attached below.

Answer:

see below

Explanation:

400 gm = 1000 gm (1/2)^n

.4 = (1/2)^n

n = 1.322  half lives = 7574.6 yrs

According to half life, 7574.6 years  would it take a 1000 gram sample to decay to only 400 grams.

Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.

400 gm = 1000 gm (1/2)[tex]^n[/tex]

.4 = (1/2)[tex]^n[/tex]

n = 1.322  half lives = 7574.6 yrs.

Thus, 7574.6 years  would it take a 1000 gram sample to decay to only 400 grams.

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Europeans wanted to trade things for rubber and oil with Africa

The equations obey the law of conservation of mass in that the number of moles of each component atom is balanced on both sides.

It states that mass is conserved during chemical reactions.

For the first equation: [tex]N_2(g) + 3H_2(g) --- > 2NH_3(g)[/tex], there are 2 nitrogen and 6 hydrogen atoms on the reactant and product's side respectively. Thus, the number of atoms is conserved.

For the second equation: [tex]HCI(aq) + KOH(aq) -- > KCI(aq) + H_2O (l)[/tex], there are an equal number of H, Cl, K, and O atoms at the reactant and product's sides. The number of atoms is also conserved.

Lastly in the equation: [tex]2Mg(s) + O_2(g) - 2MgO(s)[/tex], the number of each atom is also balanced on both sides.

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Some voltaic cells are called dry because they do not have liquids in them.

They are called dry because their electrolytes are usually in paste forms instead of aqueous form in which the electrolytes of wet cells are usually are.

The pastes in dry cells are made moist enough for the electric current to be able to flow through them.

Dry cells are advantageous because they are less heavy and one does not have to worry about the electrolyte spilling, unlike wet cells.

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Answer:

58.6934

Explanation:

periodic table

Answer:

58.6934 u

Explanation:

You can find this from the atomic mass number on a Periodic Table, Nickel is 58.6934, therefore the mass of one atom of nickel is 58.6934 u.

Answer:

many atoms are in 6.5 moles of zinc? 6.5 moles. 6.02 x 10. 23 atoms =.

3 pages

Explanation:

The number of atoms in the 6.5 moles of zinc is equal to 39.15 × 10²³ atoms of zinc.

A mole is a scientific unit that is used to measure a large number of quantities of molecules, ions, atoms, or other particular particles. The number of particles or atoms in a mole is the same for almost all substances.

The number of entities present in one mole was experimentally found to be equal to 6.023 × 10 ²³, which is a constant. This number is termed as Avogadro’s number or Avogadro’s constant.

Given, the number of moles of zinc = 6.5 moles

The number of atoms of zinc in one mole = 6.023 × 10 ²³

Then 6.5 moles of zinc will have atoms of zinc = 6.023 × 10 ²³ × 6.5

                                                                             =  39.15 × 10 ²³ atoms.

Therefore, the 39.15 × 10 ²³ Zinc atoms are in 6.5 moles of zinc.

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Answer:

D = melting and vaporization

Explanation:

Pretend this is very cold ICE

A   heat the ice up to melting point

B  melt the ice to waterheat the water to boiling

D  change water to steam

E   heat the steam up (superheat the steam)

Answer:

How do you think plants would grow in space? Which tropism(s) would be affected and why?

In the absence of gravity, plants use other environmental factors, such as light, to orient and guide growth. A bank of light emitting diodes (LEDs) above the plants produces a spectrum of light suited for the plants' growth. Enjoy don't  fail :)

Explanation:

In an ecosystem like space where there is no gravity, geotropism would be affected .

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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The number of chlorine atoms present on the product side of the reaction is 6

Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

2Al + 6HCl → 2AlCl₃ + 3H₂

Products => AlCl₃ and H₂

Number of Cl atoms = 2 × 3

Number of Cl atoms = 6 atoms

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Answer: 3. 6

Explanation: To put it simply

Answer:

Organic compounds

Explanations:

Organic compounds usually have carbon bonded with one or more of the following: hydrogen, nitrogen, or oxygen

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The mass in grams of the given beryllium sulfide is 99.2 g. The correct option is the second option - 99.2 g BeS

From the question, we are to determine the mass of the given beryllium sulfide.

From the given information,

Number of moles of beryllium sulfide (BeS) given = 2.42 moles

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of BeS = 41 g/mol

Then,

Mass of BeS = 2.42 × 41

Mass of BeS = 99.22

Mass of BeS ≅ 99.2 g

Hence, the mass in grams of the given beryllium sulfide is 99.2 g. The correct option is the second option - 99.2 g BeS

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0.14

Explanation:

I just needed to finish setting up my account

Answer:

an acid is a proton (H⁺) donor, and a base is a proton acceptor.

Explanation:

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Answer:

Mixture

Explanation:

Air is a mixture, meaning it can be separated into its components without a chemical reaction taking place. In this case, it is a mixture of gases.

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[tex]\\ \rm\Rrightarrow pOH=-log[OH-][/tex]

[tex]\\ \rm\Rrightarrow pOH=-logx[/tex]

[tex]\\ \rm\Rrightarrow 4.86=-logx[/tex]

[tex]\\ \rm\Rrightarrow logx=-4.86[/tex]

[tex]\\ \rm\Rrightarrow x=10^{-4.86}[/tex]

[tex]\\ \rm\Rrightarrow x=1.38M[/tex]

Human activities such as fracking might lead to problems such as sinkholes

Sinkholes are openings that form on the surface ofb the earth when water washes away the surface rock or soil layer exposing caverns that have formed within the earth.

Fracking involves using superheated water underground in order to drill natural gas and petroleum from underground.

Human activities such as fracking has been proven to increase the incidence of sinkholes.

Therefore, it can be concluded that fracking might lead to problems such as sinkholes.

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Answer:

1. D. fracking

2. A. algae

3. B. Pollution from the mines makes its way into water sources for Native American tribes and other people in the state.

4. C. during the Industrial Revolution

5. C. pollution of waters from open-pit mining

Unit 8 Lesson 8: Impact of Chemical Processes Quick Check

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For a radioactive isotope has an activity of 9.60 mCi.  , the half-life of the isotope is mathematically given as

t0.5 = 23893 s

Generally, the equation for the half-life  is mathematically given as

t0.5=T*0.693

Where

A = A0 e^(-t/T)

t/T = lnA0/A

3.75 hours/T=ln 9.60/7.39

T = 34478.5 s

Therefore

t1/2 = TX0.693

t0.5 = 23893 s

In conclusion, the half life

t0.5 = 23893 s

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Answer: 4

Explanation:

Answer:

If you ask for water and water immediately appears that very second, this is an example of something instantaneous.

Then double displacement will happen

The reaction given by

[tex]\\ \rm\Rrightarrow Li_3AsO_4+Fe(NO_3)_3\longrightarrow LiNO_3+FeAsO_4[/tex]

Remember that nitrate ions and compounds are highly soluble in water like HNO_3 ,KNO_3.

So LiNO_3 remains dissolved in water or aqueous.

FeAsO_4 will be in solute form i.e precipitate

Answer:

Strong Alkali – Is an alkali which dissociates – almost completely in aqueous solution thereby producing a – high concentration of hydroxyl [OH– ] ions.

Weak alkali – Is an alkali which dissociates – only partially in aqueous solution thereby producing a – low concentration of hydroxyl [OH–] ions.

Explanation:

Molarity = mol/L or g/L

Data:

Mass>80.0g

Mr of CaCl2>111.1g/mol

V>500mL

Convert mL to Litres;. mole=g/Mr

1L=1000mL. =80g/111.1g/mol

x=500mL. =0.720072007mol

x=0.5L

Molarity= mole/volume

=0.720072007mol/0.5L

=1.440144014mol/L

=1.4401mol/L

Hope this helps. Depending on the question you can also find it in g/L but mol/L is safer.

If a spoon of copper metal is placed in a solution of ferrous sulfate then no reaction will take place.

Electrochemical series of metals is the series which gives idea about the reactivity of the metals if present in any solution of another metal.

Iron metal is placed at the top position with respect to the copper metal, means iron is more reactive than copper. So when a spoon of copper metal is placed in a solution of ferrous sulfate, copper will not able to displace the iron metals from its solution.

Hence no reaction will occur.

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Answer:

damming rivers for hydroelectricity, using water for farming, deforestation and the burning of fossil fuels.

Explanation: