First of all to correct your spelling. It is 'Concrete', not 'concrerte'.
As concrete it is an heterogeneous mixture of cement, sand, gravel and water.
Ammonia (NH3) is a compound, not an element. It is a homogeneous mixture when dissolved in water, but a pure sample of ammonia gas is considered a compound.
Sodium metal is an element, not a compound. It is a pure substance made up of only sodium atoms arranged in a lattice structure, making it a homogeneous material.
NO!!! Elements and compoounds exists as separate entities. Heterogeneous means a mixture of substances that are in different physical states. Compare to Homogeneous which means a mixture of substances that are in the SAME physical state. However, The element bromine(Br) is liquid at STP. The compound water(H2O) is also a liquid at STP. When mixed together to form bromin water, it is an homogeneous mixture.
Arsenic is a chemical element with the symbol As, atomic number 33.
Sand in water is a heterogeneous mixture. The sand does not dissolve in the water, and the two components can be visibly distinguished.
heterogeneous
compound and element
compound
It is an element.
it is a heterogeneous
Concrete is a heterogeneous mixture.
heterogeneous
Homogeneous mixture
Vinegar is a homogeneous mixture.
heterogeneous
This is a heterogeneous mixture.
Cheerios is a heterogeneous mixture.