20 Which statement is a scientific law?
O Scientists use genes to explain why evolution happens.
O Genes are long patterns that are similar to computer codes.
O A person's traits are controlled by different forms of a gene.
O The discovery of genes changed how scientists think about life.
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What type of reaction is zn + cucl2 → cu + zncl2?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.