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3 years ago

PLZ HELP 2 mins left

Chemistry

1 answer:

mrs_skeptik [129]3 years ago

5 0

Answer:

No matter how many times you cut it, its chemical properties won't change and it'll still be paper.

Explanation:

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a student is holding a model of the human brain whht are two benefits of this model? side note: HELP IT'S A TEST AND I ONLY HAVE

mojhsa [17]

Answer:

One, It can help children to easily learn or recognize the structure of the brain.

Second, It can help children to learn about the ridges and groves, blood vessels in the brain which will grow curiosity in them to do more research about the stucture and function of the brain.

Explanation:

I hope this helps :)

6 0

3 years ago

What mass of silver chloride precipitate will be produced if 25 cm3 of 0.1M silver nitrate is added to excess sodium chloride so

ehidna [41]

We have 25cm^3 of 0.1mol AgNO3.

25cm^3 = 0.025L, so we have 0.025 x 0.1 = 0.0025mol AgNO3, so

0.0025AgNO3 + 0.0025NaCl = 0.0025AgCl + 0.0025NaNO3

Change in Free Energy: ΔG(20C) = -0.064kJ (negative, so the reaction runs)

Change in Enthalpy: ΔH(20C) = -0.110kJ (negative, so the reaction is exothermic)

This reaction produces 0.358g of AgCl and 0.213g of NaNO3

Les Mclean PhD

6 0

2 years ago

The molar heat of fusion of platinum (Pt) is 4.700 kcal/mol. How much heat must be added to 85.5 g of

zvonat [6]

Answer:

2.07 Kcal heat must be added to completely melt the platinum.

Explanation:

Given data:

Molar heat of fusion = 4.700 Kcal / mol

Mass of platinum = 85.5 g

Heat of fusion = ?

Solution:

Formula:

ΔH = n × molar heat of fusion

n = number of moles

Now we will calculate the number of moles:

Number of moles = mass / molar mass

Number of moles = 85.5 g /195.08 g/mol

Number of moles = 0.44 mole

ΔH = n × molar heat of fusion

ΔH = 0.44 mol × 4.700 Kcal / mol

ΔH = 2.07 Kcal

3 0

3 years ago

Read 2 more answers

a 100.0 g sample of a metal m is burned in air to produce 103.7 g of its oxide with the formula m2o. what is the atomic mass of

Ahat [919]

The molar mass should be 14.898g/mol. I used the equation 100gx(1/xg/mol)x(1mol/2mol)x(16g/mol+x)/1)=103.7 and solve for x. I found that equation using stoichiometry and the equation 2m+1/2O2-->m2O The molar mass of the metal I set to x and the molar mass of the metal oxide is 16+x.

6 0

4 years ago

Two common methods to generate an aldehyde is by oxidation of an alcohol and through ozonolysis.

kotykmax [81]

Answer:

a. True.

Explanation:

Only primary and secondary alcohols can oxidise to give an aldehyde. But a weak oxidizing agent must be used to prevent formation of a carboxylic acid or ketone.

weak oxidizing agents: Chromyl chloride, silver/oxygen/500°C

take an example of ethanol:

 ${ \bf{CH _{3} CH_{2}OH \: \: \frac{Ag/O_{2} }{500 \degree C} > \: \:CH _{3} CHO}}$ 

 ${ \sf{CH _{3} CHO \: \: is \: ethanal}}$ 

By ozonolysis:

Here, reactants are Ozone gas, Carbon tetrachloride at a temperature (<20°C), ethanoic acid, zinc and water.

take an example of propanol:

if it undergoes ozonolysis, it gives ethanal and methanal.

5 0

3 years ago

Read 2 more answers