Question

1. which statement describes a chemical property of silicon? 1) silicon has a blue - gray color. 2) silicon is a brittle solid at 20.°c. 3) silicon melts at 1414°c. 4) silicon reacts with fluorine. 2) which statement describes a chemical property of aluminum? 1) aluminum is malleable. 2) aluminum reacts with sulfuric acid. 3) aluminum conducts an electric current. 4) aluminum has a density of 2.698 g/cm³ at stp. 3) any substance composed of two or more elements that are chemically combined in a fixed proportion is 1) an isomer 2) an isotope 3) a solution 4) a compound 4) a mixture of crystals of salt and sugar is added to water and stirred until all solids have dissolved. which statement best describes the resulting mixture? 1) the mixture is homogeneous and soluble. 5) at stp, which physical property of aluminum always remains the same from sample to sample? 1) mass 2) density 3) length 4) volume 6) which of these terms refers to matter that could be heterogeneous? 1) element 2) mixture 3) compound 4) solution 7) one similarity between all mixtures and compounds is that both 1) are heterogeneous 2) are homogeneous 3) combine in a definite ratio 4) consist of two or more substances 8) which statement is an identifying characteristic of a mixture? 1) a mixture can consist of a single element. 2) a mixture can be separated by physical means. 3) a mixture must have a definite composition by weight. 4) a mixture must be homogeneous.

Explanation:

Answer:

(1) 4) Silicon reacts with fluorine.
(2) 2) Aluminum reacts with sulfuric acid.
(3) 4) a compound
(4) 1) The mixture is homogeneous and
(5) 2) density
(6) 2) mixture
(7) 4) consist of two or more substances
(8) 2) A mixture can be separated by physical means.