Answer:
Density
Explanation:
Density is defined as the mass per unit volume. It is the ratio between the mass and the volume of a substance. It does not matter how large or small a sample of matter is, the same substance will always have the same density, because of this. The ratio between the mass and volume remains the same.
Answer:
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A chemical change refers to a process by which a substance becomes a new and different substance. The fizzing of the tablet (also called effervescence) indicates that a gas is being produced. The gas being produced is an indication of a chemical reaction. A chemical reaction is a process in which substances undergo physical and chemical changes that result in the formation of new substances that have different properties.
Answer:
C
Explanation:
Atoms undergoing alpha decay lose 2 protons and two neutrons to become a different atom. Those two protons and neutrons are represented by an α (the symbol for alpha) particle which also represents a helium nucleus (2 neutrons and 2 protons).
