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3 years ago

Why is melting a physical property of the wax, but flammability is a chemical property?

1 answer:

8 0

Because when you melt wax it is still wax but the flammanility refers to how the material reacts with fire, when wax meets fire directly it gets charred and that it not wax anymore

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3. How many grams of aluminum can be heated from 90°C to 120°C if 500 J of heat energy are applied?

IgorLugansk [536]

We are given:

Initial Temperature = 90°c

Final Temperature = 120°c

Heat applied(ΔH) = 500 Joules

Specific heat(c) = 0.9 Joules / g°C

Mass of Aluminium(m) = ?

Change in temperature:

ΔT = Final temp. - Inital Temp.

ΔT = 120 - 90

ΔT = 30°c

Calculating the mass:

We know the formula:

ΔH = mcΔT

replacing the values:

500 = m(0.9)(30)

500 = m(27)

m = 500/27

m = 18.52 grams

5 0

3 years ago

Which statement is true of a reversible reaction at equilibrium?'

son4ous [18]

At Equilibrium, The rate of formation of Products is equal to the rate of degradation of Reactants.

Hope this helps!

5 0

3 years ago

Read 2 more answers

What is the empirical formula of an oxide of chromium that is 48% oxygen

AnnyKZ [126]

Answer:

$CrO_3$

Explanation:

Hello,

In this case, considering that the compound is 48% oxygen, we infer it is 52% chromium, therefore, by using their atomic masses we compute the moles by assuming those percentages as masses:

$n_{Cr}=52g*\frac{1mol}{52g}=1mol\\ \\n_O=48g*\frac{1mol}{16g}=3mol$

Next, by dividing by the smallest moles, we find the subscripts in the empirical formula:

$Cr=\frac{1}{1} =1\\\\O=\frac{3}{1} =3$

Which are also expressed in the smallest whole numbers, therefore the empirical formula is:

$CrO_3$

Which corresponds to the chromic oxide or chromium (IV) oxide.

Regards.

6 0

3 years ago

HELP PLZ ITS A TEST.

tensa zangetsu [6.8K]

Answer:

The answer to your question is below

Explanation:

1 ) Which of the following is a chemical property.

A. Ability to become magnetic this is wrong, it's a physical property

B. Ability to conduct electricity this is wrong, it's a physical property

C. Ability to conduct heat this is wrong, it's a physical property

D. Ability to react with acid This is the right answer

2 ) You heat two substances, A and B. Both substances change color. When cooled, substance B returns to its original color, but substance A does not. What most likely happened?.

A. Physical change occurred in both substances This is wrong, a physial change only happens in substance B

B. A physical change occurred in substance A, and a chemical change occured in substance B. This is wrong, a physical change occurred in substance B and a chemical change occurred in substance A.

C. A chemical change occurred in substance A, and a physical change occurred in substance B. This is the right answer is exactly what happens

D. A chemical change occurred in both substances This answer is wrong.

3 ) how many grams are in 2.5 pound sample? Express your answer in scientific notation with three significant figures. ( 1 pound= 453.592 grams).

Rule of three

1 pound ------------------- 453.592 g

2.5 pounds --------------- x

x = 2.5(453.592)/1

x = 1133.98 g = 1.13 x 10³ g letter D

7 0

3 years ago

Read 2 more answers

If I dilute 334.75 mL of 1.28 M lithium acetate solution to a volume of 822.18 ml, what

zlopas [31]

Answer:

C₂ = 0.52 M

Explanation:

Given data:

Initial volume = 334.75 mL

Initial concentration = 1.28 M

Final volume = 822.18 mL

Final concentration = ?

Solution:

C₁V ₁ = C₂V₂

By putting values,

1.28 M×334.75 mL = C₂×822.18 mL

C₂ = 1.28 M×334.75 mL / 822.18 mL

C₂ = 428.48 M.mL / 822.18 mL

C₂ = 0.52 M

3 0

3 years ago