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3 years ago

Explain the difference between chemical properties and physical properties. Give an example if each

1 answer:

8 0

Chemical property is when it's observed during a reaction in which the chemical composition or identity of the substance is changed. physical properties is when properties that do change the chemical nature of matter.
example for this is smell, color, freezing point, etc.

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An iron block of mass 18 kg is heated from 285 K to 318 K. If 267.3 kJ is required, what is the specific heat of iron? A. 450.00

valkas [14]

Answer:

Option A. 450.00

Explanation:

1) Data:

a) m = 18 kg

b) T₁ = 285 K

c) T₂ = 318 K

d) Q = 267.3 kJ

e) S = ?

2) Principles and equations

The specific heat of a substance is the amount of heat energy absorbed to increase the temperature of certain amount (gram, kg, or moles, depending on the definition or units) of the substance in 1 ° C or 1 K.

The mathematical relation between the specific heat and the heat energy absorbed is:

Q = m × S × ΔT

Where,

Q is the heat absorbed,
S is the specific heat, and
ΔT is the temperature increase (T₂ - T₁)

3) Solution:

a) Substitute the data into the equation:

267.3 kJ = 18 kg × S × (318 K - 285 K)

b) Solve for S and compute:

S = 267.3 kJ / (18 kg × 33 K) = 0.45 kJ / (Kg . K)

The options have not units, but I notice that the first answer is 1,000 times the answer I obtained, so I will make a conversion of units.

c) Convert to J /( kg . k):

0.45 kJ / (Kg . K) × 1,000 J / kJ = 450 J / (kg . K)

Now we can see that the option A is is the answer, assuming the units.

6 0

3 years ago

Complex molecules are formed by the bond formation between monomers . Which process is being referred to in this statement? A.)

Vesnalui [34]

I think the correct answer from the choices listed above is option B. Polymerization is the process of forming complex molecules by the bond formation between monomers. There are two types of this process which are the addition and condensation polymerization.

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3 years ago

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Draw the products of the complete hydrolysis of an acetal. Draw all products of the reaction.

jolli1 [7]

Answer: the product is ketone or aldehyde

Explanation:

The first step is the conversion of acetal to hemiacetal in the presence of H3O+/ ROH, and then the final conversion of hemiacetal to ketone/aldehyde using

H3O+/ ROH...

Attached is the structural conversion

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3 years ago

The volcano in the image is called Ol Doinyo Lengai. This volcano formed as a result of two plates separating. Which other type

creativ13 [48]

Answer:

Convergent

Explanation:

I did the test

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3 years ago

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How many grams of KBr are contained in 150. mL of a 0.154 M solution of potassium bromide?

Lostsunrise [7]

Answer:

I think it is B

Explanation:

because the others don't look right

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3 years ago