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5} The important ingredients of a toothpaste are abrasives, water and fluoride. Abrasives such as calcium carbonate and calcium hydrogen phosphates help to remove the dirt on teeth and also helps to polish them. Fluoride is the most common active ingredients used to prevent decay of our teeth. It helps in strenghtening of bones and the enamel which covers the teeth
6}1) dissolving - physical change
2) a meteor streaking across the sky - chemical change
When a substance is dissolved in liquid, then the state of matter of the substance undergoes change. No chemical reaction is involved and the chemical properties do not change. Hence, dissolving is a type of physical change.
When a meteor strikes across the sky, at that time meteor starts burning. Burning a substance induces chemical change as the chemical properties are changed.
7)There are two groups of muscle sets which are involved in lifting, the biceps and triceps muscles when triceps muscle contract then biceps muscles relaxes that cause the straightens the arms when biceps muscle contract and triceps muscles relax then hand lift.
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