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MatroZZZ [7]
3 years ago
7

Two changes are described below. a. Ice melts to form water. b. Sugar cubes dissolve in hot coffee. Which statement is true abou

t the two changes?a. Both are chemical changes because there is a change in the composition of ice and sugar.b. Both are physical changes because there is a change in the physical states of ice and sugar.c. A is a physical change due to a change of state, but B is a chemical change because new molecules are formed.d. A is a chemical change due to a change of state, but B is a physical change because new molecules are formed.
Chemistry
1 answer:
-Dominant- [34]3 years ago
3 0

Answer: Option (b) is the correct answer.

Explanation:

A change that does not lead to any difference in chemical composition of a substance is known as a physical change.

For example, shape, size, mass, volume, density, boiling point, etc of a substance are all physical properties.

As ice melts to form water shows that only the state of matter is changing. Hence, it is a physical change. Similarly, sugar cubes dissolve in hot coffee is also a physical change as no new compound has formed.

On the other hand, changes that lead to bring change in chemical composition of a substance is known as a chemical change.

For example, exploding dynamite, rotting cheese etc are all chemical changes.

Thus, we can conclude that both are physical changes because there is a change in the physical states of ice and sugar.

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Some instruments differentiate individual quanta of electromagnetic radiation based on their energies. assume such an instrument
bulgar [2K]

Answer:

5.68×10¯¹⁰ m

Explanation:

From the question given above, the following data were obtained:

Energy (E) = 3.50×10¯¹⁶ J

Wavelength (λ) =?

Energy (E) and wavelength (λ) are related according to the following formula:

E = hv/λ

Where

E => is the energy

h => is the Planck's constant

v => is the velocity of electromagnetic radiation

λ => is the wavelength of the radiation.

With the above formula, we can obtain the wavelength of the radiation as follow:

Energy (E) = 3.50×10¯¹⁶ J

Planck's constant (h) = 6.63×10¯³⁴ Js

Velocity (v) = 3×10⁸ m/s

Wavelength (λ) =?

E = hv/λ

3.50×10¯¹⁶ = 6.63×10¯³⁴ × 3×10⁸ / λ

3.50×10¯¹⁶ = 1.989×10¯²⁵/ λ

Cross multiply

3.50×10¯¹⁶ × λ = 1.989×10¯²⁵

Divide both side by 3.50×10¯¹⁶

λ = 1.989×10¯²⁵ / 3.50×10¯¹⁶

λ = 5.68×10¯¹⁰ m

Thus, the wavelength of the radiation is

5.68×10¯¹⁰ m

7 0
3 years ago
Balance the following equation. What is the coefficient for hydrogen fluoride?
NeTakaya

Answer:

ans .4

Explanation:

SiO2 +HF ⇒ SiF4 +H2O

reactant side                          product side

Si = 1                                    Si = 1      its balanced

O = 2                    O = 1    (× WITH 2 ) we got O =2 And H = 4

H = 1                                     H = 2  NOW H =4

F= 1   (×4)                                   F   = 4

now we get SiO2 +4 HF ⇒SiF4 +2 H2O

After multiply with number again check it. Si = 1, O = 2 ,H=4 ,F=4

5 0
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