Question

(choose 2) si is which of the following: *
pure substance
mixture
compound
element
homogenous
heterogenous

(choose 2) nacl + h20 is which of the following: *
pure substance
mixture
compound
element
homogenous
heterogenous

(choose 2) c6h1206 + h20 is which of the following: *
pure substance
mixture
compound
element
homogenous
heterogenous

Explanation:

• For Si:
• A pure substance has a definite and constant composition. Silicon (\(Si\)) is a pure substance as it has a fixed composition.
• An element is a pure substance that cannot be broken down into simpler substances by chemical means. Silicon is an element as it consists of only one type of atom (\(Si\) atoms).
• For \(NaCl + H_2O\):
• A mixture is a combination of two or more substances where each substance retains its own chemical properties. \(NaCl + H_2O\) is a mixture because \(NaCl\) (sodium chloride) and \(H_2O\) (water) are two different substances combined together.
• A homogeneous mixture has a uniform composition throughout. When \(NaCl\) is dissolved in \(H_2O\), it forms a solution (a type of homogeneous mixture) as the \(NaCl\) particles are evenly distributed in the \(H_2O\).
• For \(C_6H_{12}O_6+H_2O\):
• Similar to \(NaCl + H_2O\), \(C_6H_{12}O_6\) (glucose) and \(H_2O\) are two different substances combined, so it is a mixture.
• When glucose (\(C_6H_{12}O_6\)) is dissolved in water (\(H_2O\)), it forms a solution (a homogeneous mixture) as the glucose molecules are evenly distributed in the water.

Answer:

• For \(Si\): Pure Substance, Element
• For \(NaCl + H_2O\): Mixture, Homogenous
• For \(C_6H_{12}O_6 + H_2O\): Mixture, Homogenous