The physicals properties of a substance can be used to identify the substance, because. Select all that apply.

1. at any given location, the physical properties of a substance do not change
2. when the substances are chemically reacted the physical properties remain the same
3. each substance has a unique set of physical properties
4. no two substances have any of the same properties

1. at any given location, the physical properties of a substance do not change.

2. Each substance has a unique set of physical properties

Explanation:

The physical property of a substance is a feature of a substance that can be noticed or measured without changing the key identity of the substance. Physical properties include density, hardness, melting point, colour etc...

1. at any given location, the physical properties of a substance do not change

3. each substance has a unique set of physical properties

Explanation:

1. The physical properties of a substance do not change provided that the physical conditions in the niche environment remain same.

3. Every substance on Earth has a unique set and arrangement of atoms and molecules that give them their own unique properties.

answer; protein;

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms