تغيرات المادة

لماذا يُعتَبر تمزيق قطعة من الورق تغيرًا فيزيائيًا؟

• بسبب تغير لون الورقة.

• لأن التركيب الداخلي للورقة يبقى كما هو دون تغيير.

• لا يمكن إعادة الورقة إلى حالتها الأصلية.

• لأنها تُنتج حرارة وضوءًا.

What are the two primary categories of changes that matter can undergo?

• Thermal and electrical changes.

• Physical and chemical changes.

• Biological and mechanical changes.

• Magnetic and gravitational changes.

What defines a physical change in matter?

• It results in a new substance with different properties.

• It alters the internal composition of the substance.

• It changes the external appearance without altering the internal composition.

• It is always an irreversible process.

Which of these is an example of a physical change?

• Burning a candle.

• Baking a cake.

• Melting a block of ice.

• Digesting food.

What is a physical change?

• A change that results in new substances.

• A change in the external appearance of a substance without changing its internal composition.

• A change that involves the formation of a precipitate.

• A change that produces heat or light.

Which of the following is an example of a physical change?

• Burning wood

• Rusting of iron

• Melting ice

• Digestion of food

What defines a chemical change?

• A change in the state of matter.

• A change in the external shape of a substance.

• A change that involves one or more substances transforming into new substances.

• A change that can be easily reversed.

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Which of the following is an indicator of a chemical reaction?

• Change in shape

• Change in volume

• Formation of a precipitate

• Change in density

Which of the following is an indicator of a chemical reaction?

• Change in shape

• Emission of gas

• Change in state

• Dissolving