We can consider a chemical to be safe if it does not contain any harmful substances such as nitrogen, harmful acids, or even excessive heat. Other chemicals such as the chemicals used in food products like, for example, citric acid, is not so harmful.
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False-- most of the time not enough energy is put into the system, so the compounds or whatever cant break down fully into their elements
Answer: Helianthus L. Sunflower
Explanation:
Answer:
It is a physical change because this change is reversible and no chemical reaction occurs.
Explanation:
Halogens is defined as the group of 7 periodic table. As, every periodic table contains 7 valence electrons and they only need 1 more to complete an outer shell, that is why they are extremely reactive. And according to the law that recurring patterns of the properties of elements arise when they are arranged in order of increasing atomic number. As the halogen all act very similarly with each other in chemical reaction, it is true.
