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3 years ago

Which of the following is an example of a chemical change? (Select all that apply).

Chemistry

2 answers:

Irina18 [472]3 years ago

6 0

Answer:

Baking soda and vinegar combine and bubbles (a gas) are produced

Two liquids combine to form a solid substance

A match burns

Explanation:

mario62 [17]3 years ago

6 0

Answer:

Baking soda and vinegar combine and bubbles (a gas) are produced.

Water evaporates from a pot of boiling water.

A match burns.

Two liquids combine to form a solid substance.

Explanation:

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Iron and sulfur react to yield iron sulfide. Balance this reaction.

mariarad [96]

Answer:

8Fe + S8 -> 8FeS

Explanation:

7 0

4 years ago

Read 2 more answers

The solid-state transition of Sn(gray) to Sn(white) is in equilibrium at 18.0 ˚C and 1.00 atm, with an entropy change of 8.8 J K

Vika [28.1K]

Answer:

Transition temperature = 13 C

Explanation:

ΔS(transition) = 8.8 J/K.mol

ρ(gray) = 5.75 g/cm³ = 5750 kg/m³

ρ(white) = 7.28 g/cm³ = 7280 kg/m³

ΔP = 100 atm = 100 x 101325 = 10132500 Pa

M(Sn) = 118.71g/mol = 118.71 x 10⁻³ kg/mol

T(i) = 18 C, T(f) = ?

We know that

G = H - TS, where G is the gibbs free energy, H is the enthalpy, T is the temperature and S is the entropy

H = V(m) x P, hence the equation becomes

G = V(m) x P - TS

The change in Gibbs free energy going from G(gray) to G(white) = 0 as no change of state takes place hence it can be said that

ΔG(gray) - ΔG(white) = 0

replacing the G with it formula shown above we can arrange the equation such as

0 = V(m)(gray) - V(m)(white) x ΔP - (ΔS(gray) - ΔS(white)) x ΔT

solving for ΔT we get

ΔT = {V(m)(gray) - V(m)(white) x ΔP}/(ΔS(gray) - ΔS(white))

ΔT = {M(Sn)(1/ρ(gray) - 1/ρ(white) x ΔP}/(ΔS(gray) - ΔS(white))

ΔT = {118.71 x 10⁻³ x {(1/5750) - (1/7280)} x 10132500}/(8.8)) = 5.0 C

ΔT = T(initial) - T(transition)

T(transition) = T(initial) - ΔT = 18 - 5 = 13 C

5 0

3 years ago

In what form does the sun's energy arrive on Earth?The physical characteristics of two large predatory animal species are shown

eimsori [14]

Answer:

radiation B species x because short canines are less likely to break.

6 0

2 years ago

Compound W, C6H11Cl, undergoes base-promoted E2 elimination to form a single alkene Y. Under similar reaction conditions X, C6H1

alexgriva [62]

Answer:

; The structures of both compounds are shown in the attached image.

Explanation:

First, compound W has the molecular formula C6H11Cl, it is observed that it does not have double bonds. removal of E2 produces compound Y, which is an alkene, which is hydrogenated and produces a methylcyclopentane.

Compound W is an alkyl halide that undergoes an SN1 reaction with sodium iodide in the presence of acetone forming the corresponding iodine compound.

while compound X is a tertiary alkyl halide, it is sterically restricted to undergo SN2 reactions.

4 0

4 years ago

The average osmotic pressure of ocean water is 28 atm corresponding to a concentration of 0.50m solutes. what is the approximate

RideAnS [48]

Answer : 0.125 M

Explanation : The definition of osmotic pressure is "<span><em>the pressure can be applied on a pure solvent to prevent it passing into a given solution by osmosis</em>".
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So according to this definition, osmotic pressure can be called as directly proportional to the concentration of the solution and hence the pressure can also be directly proportional to the concentration.

Hence, if pressure is getting decreased from 28 to 7 it means it got decreased by 4 times;
28 / 7 = 4 that means;

So the concentration will be also decreased by 4 times so, 0.50 / 4 = 0.125 M

6 0

3 years ago