Agroup of students measured the density, the state of matter at 25 degrees celsius, reactions with water, and reactions to a flame and recorded the data in the table below: based on the results, what can be determined about the substances? options: a. all substances experienced a chemical change. b. argon did not experience a chemical change. c. only sodium experienced a chemical change. d. only hydrogen gas and sodium experienced a chemical change

I would say that the answer is C.Only sodium experienced a chemical change because, sodium is the only element that reacted to the water. hope this helps :)

tell me if is right or wrong :)

B... I took the test

- 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