Some calcifiers can use bicarbonate (HCO3-) to make their shells. How will they be affected by the decrease in pH

Answer:

It is already balanced

Explanation:

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

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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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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:

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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Answer:

galvanic cell or electrochemical cell

Explanation:

the electrolytic cell needs electric supply to make charges flow from anode to cathode while the galvanic cell doesn't.

The electrolytic cell needs electric supply to make charges flow from anode to cathode while the galvanic cell doesn't.

A device that can produce electrical energy from the chemical reactions taking place inside it is called an electrochemical cell. Electrochemical cells include a common 1.5V cell seen in TV remotes and clocks as well as lithium-ion batteries found in smart phones.

Galvanic cells, often referred to as Voltaic cells, and electrolytic cells are the two forms of electrochemical cells.

"In galvanic cells, spontaneous redox reactions take place, converting chemical energy into electrical energy. As opposed to electrolytic cells, which use an external power source to drive internal chemical reactions, which transform electrical energy into chemical energy.

Therefore, The electrolytic cell needs electric supply to make charges flow from anode to cathode while the galvanic cell doesn't.

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Answer:

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

Explanation:

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Answer:

A mature leafy tree produces as much oxygen in a season as 10 people inhale in a year." "A 100-foot tree, 18 inches diameter at its base, produces 6,000 pounds of oxygen." "On average, one tree produces nearly 260 pounds of oxygen each year. Two mature trees can provide enough oxygen for a family of four.

Explanation:

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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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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:

Organic compounds

Explanations:

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

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Europeans wanted to trade things for rubber and oil with Africa

Answer:

1. Venus

471°C

2. Mercury

(430°C) during the day,  (-180°C) at night

3. Earth

16°C

4. Mars

-28°C

5. Jupiter

-108°C

6. Saturn

-138°C

7. Uranus

-195°C

8. Neptune

-201°C

Explanation:

.

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:

B

Explanation:

Copper is lower on the activity series, so it can't replace nickel in this reaction. Therefore, no reaction will occur.

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

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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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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Answer: 4

Explanation:

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.

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:

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

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:

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.

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:

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.

0.14

Explanation:

I just needed to finish setting up my account

The indirect result of contaminants from commercial farming is algae.

Contaminant is a substance either chemical, physical that is very toxic or harmful to living organisms, when it is released into air, water, soil or food.

Contaminant are poisionus substance that are not deliberately or are deliberately introduced to space . This contaminants make things impure and they are highly poisionus.

Therefore, The indirect result of contaminants from commercial farming is algae.

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