Answer:
The safety button doesn't click before the jar has been opened because it shows a sign of freshness. Once you have opened it there is no way to make it click again.
If bacteria gets stored in the jar they will produce gas. If the button does not pop or click after opened that is a sign that it may not be so safe to eat. Clicking shows that there is still vacuum to the jar.
Explanation:
Answer:
It reacts explosively with oxygen.
Explanation:
Reactivity is a chemical property.
Taste, temperature, and density are all chemical properties.
Answer:
The nucleus has an overall positive charge as it contains the protons. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
Explanation:
Answer:
Mercury
Chemical element
Symbol: Hg
Explanation:
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