Read the passage and answer the next two questions. Scientists created energy diagrams to correspond to various chemical reactions. These
energy diagrams represented the energy changes of various reactants and products as
the reactions take place. These diagrams showed that endothermic reactions absorb
energy from their surroundings while exothermic reactions released energy into their
surroundings. The diagrams also showed the activation energies associated with
various reactions.
14. Observe the graph. Which of the following statements is correct?
Modeling an Endothermic Reaction
I
Energy
Direction of reaction
|
A. The energy of the reactants is lower than the energy of the products.
B. The energy of the reactants is higher than the energy of the products.
C. The energy of the reactants is equal to the energy of the products.
D. There is no energy absorbed during this reaction.

- 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

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im not exactly sure but i think its b!