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Select the element from the choices below.(1 point)

Responses

NaCl
NaCl

HCl
HCl

O
O

MgBr
MgBr

There are 3 unknown substances A, B, and C that need to be classified as element, mixture or compound.. Substance A can be broken down by a physical change. Substance B cannot be broken down by a chemical or physical change. Substance C can only be broken down by a chemical change. How would you classify these substances based on the given information?(1 point)
Responses

Substance A is a compound, substance B is an element, and substance C is a mixture.
Substance A is a compound, substance B is an element, and substance C is a mixture.

Substance A is a compound, substance B is a mixture, and substance C is an element.
Substance A is a compound, substance B is a mixture, and substance C is an element.

Substance A is a mixture, substance B is an element, and substance C is a compound.
Substance A is a mixture, substance B is an element, and substance C is a compound.

Substance A is an element, substance B is a compound, and substance C is a mixture.

Which statement is true?(1 point)
Responses

An object melts as the particles slow down.
An object melts as the particles slow down.

Particles move faster when they melt than when they evaporate.
Particles move faster when they melt than when they evaporate.

Particles speed up when an object solidifies.
Particles speed up when an object solidifies.

Particles in an object move faster at 50°C than at 20°C.
Particles in an object move faster at 50°C than at 20°C

This graph shows the phase change for water.



Which statement best describes what is happening at portion C?

(1 point)
Responses

Both Energy and temperature remain the same.
Both Energy and temperature remain the same.

The energy is increasing, and temperature is also increasing.
The energy is increasing, and temperature is also increasing.

The energy is increasing, but the temperature stays the same.
The energy is increasing, but the temperature stays the same.

The temperature is increasing, but the energy stays the same.

1 answer

  1. Select the element from the choices below.

    • Response: O

  2. How would you classify these substances based on the given information?

    • Substance A as a mixture (since it can be broken down by a physical change), Substance B as an element (since it cannot be broken down by chemical or physical change), and Substance C as a compound (since it can only be broken down by a chemical change).
    • Response: Substance A is a mixture, substance B is an element, and substance C is a compound.

  3. Which statement is true?

    • Response: Particles in an object move faster at 50°C than at 20°C.

  4. Which statement best describes what is happening at portion C?

    • Response: The energy is increasing, but the temperature stays the same.