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3 years ago

Which of these is an example of a physical change?

Chemistry

2 answers:

VLD [36.1K]3 years ago

6 0

I would say A due to it needing physical streangth.

Goryan [66]3 years ago

4 0

Is it a multiple choice?

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How much lead(II) chromate (PbCrO4) is precipitated by mixing 100 mL of aqueous 3 M

ICE Princess25 [194]

Answer:

38.8 g of PbCrO₄ are precipitated from the reaction

Explanation:

We have the following chemical reaction:

K₂CrO₄ (aq) + Pb(NO₃)₂ (aq) → 2 KNO₃ (aq) + PbCrO₄ (s)

where:

(aq) - aqueous

(s) - solid

Now we use the following formula to calculate the number of moles:

molar concentration = number of moles / volume (L)

number of moles = molar concentration × volume (L)

number of moles of K₂CrO₄ = 3 × 0.1 = 0.3 moles

number of moles of Pb(NO₃)₂ = 2 × 0.1 = 0.2 moles

We see from the chemical reaction that 1 mole of K₂CrO₄ will react with 1 mole of Pb(NO₃)₂ so 0.3 moles of K₂CrO₄ will react with 0.3 moles of Pb(NO₃)₂ but we have only 0.2 moles of Pb(NO₃)₂ available, so the limiting reactant is Pb(NO₃)₂. Taking this in account we devise the following reasoning:

if 1 moles of Pb(NO₃)₂ produces 1 mole of PbCrO₄

then 0.2 moles of Pb(NO₃)₂ produces X moles of PbCrO₄

X = 0.2 moles of PbCrO₄

number of moles = mass / molar weight

mass = number of moles × molar weight

mass of PbCrO₄ = 0.2 × 194 = 38.8 g

Learn more about:

molar concentration

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4 0

3 years ago

During which time interval does the substance exist as both a liquid and a solid

Inessa [10]

The Chemistry Regents is one of the four science Regents exams. The other three are Earth Science, Living Environment, and Physics. You'll need to pass at least one of these four exams to graduate high school.

8 0

2 years ago

Chemical bonds are likely to form when

shusha [124]

<span>b. an atom’s outer energy level doesn't have the maximum number of electrons.</span>

6 0

2 years ago

Read 2 more answers

Determine the approximate amount of potassium hydrogen phthalate, KHP, that you will need to neutralize 6.00 ml of 0.100 M NaOH.

Sveta_85 [38]

Answer:

potassium hydrogen phthalate KHP MOLAR MASS = 204.233 glmol

to get 1000 ml

Molar concentration = Mass concentration/Molar Mass

mass concentration = molar concentration x molar mass

mass concentration=0.1 M,

molar mass= 204.233 g/mol

so to get 1L

mass conc = 204.233 x 0.1

= 20.4233g for 1L or 1000 ml

to get 6.00 ml

if 20.4233g is for 1000ml

then to 6.00 ml

= 20.4233 x 6 / 1000

= 0.123g for 6.00 ml

according to the equation below

NaOH(aq) + KHC8H4O4(aq) --> KNaC8H4O4(aq) + H2O(l)

number of moles of NaOH is equal to that of KHP

so the same amount will be needed too, which is

= 0.123g

6 0

2 years ago

You find a compound composed only of element X and chlorine and you know that the compound is 13.10% X by mass. Each molecule of

8_murik_8 [283]

Answer:

Explanation:

So, the formula for the compound should be:

$XCl_{6}$

Now we assume that we have 1 mol of substance, so we can make calculations to know the molar mass of element X, as follows:

$M_{Cl}=35.45g/mol\\$

So we have that 6 moles weight 212.7g, and we can make a rule of three to know the weight of compound X:

$212.7g\rightarrow 86.9\%\\x\rightarrow 13.1\%\\\\x=\frac{212.7g*13.1}{86.9} =32.06g$

As we used 1 mol, we know that the molar mass is 32.06g/mol

So the element has a molar mass of 32.06 g/mol and an oxidation state of +6, with this information, we can assure that the element X is sulfur, so the compound is $SCl_{6}$

8 0

3 years ago