Question

1 multiple choice 1 point which of these is an element? oxygen salt oil and water salt water 2 multiple choice 1 point which of these is a homogeneous mixture? copper tea sio₂ sand and water

Explanation:

1. An element is a pure substance made of only one type of atom. Oxygen is an element, while salt is a compound, oil - water and salt - water are mixtures.
2. A homogeneous mixture has a uniform composition throughout. Tea is a homogeneous mixture as its components are uniformly distributed. Copper is an element, SiO₂ is a compound, and sand - water is a heterogeneous mixture.

Answer:

1. oxygen
2. tea