Pure sugar is a substance (compound).
a mixture
pure substance
Neither. Oxygen is an element, which is a pure substance and not a mixture.
Aluminum is an element, a pure substance.
Copper metal is an element and thus a pure substance.
Chocolate pudding would be considered a pure substance.
It's an element. So, yes, it's a substance, not a mixture.
quarts is a solid it is a pure substance and it is a element
Calcium is an element and therefore a pure substance.
Pure sugar is a compound, which is a pure substance. If you dissolve sugar in water, you will have a homogeneous mixture, which is a solution.
Oxygen is an element and a pure substance.
There are many types of sugar but, if you are describing one type of sugar and not a mixture of many sugars it would be a pure substance.