It's an old recipe for putty, especially glazing putty.
chalk is a compound
No, a mixture of sugar and chalk is considered heterogeneous. This is because sugar and chalk do not dissolve in each other, so they would have visible differences and not form a uniform composition throughout the mixture.
chalk is a compound
No, a mixture of chalk and water is not a colloid. A colloid is a mixture where one substance is evenly dispersed in another substance, forming a homogeneous mixture. Since chalk does not form a homogeneous mixture with water, it is not considered a colloid.
it is a mixture of white paint and white chalk
Chalk is a mechanical mixture, which means it is a combination of different substances that are physically mixed together but not chemically bonded. It is composed mainly of calcium carbonate and other minerals.
This is a suspension.
To separate salt from chalk, you can dissolve the mixture in water. Salt is soluble in water while chalk is not. After dissolving, you can filter the mixture to separate the insoluble chalk from the salt solution. By evaporating the water from the salt solution, you can obtain the salt crystals.
Chalk is Calcium Carbonate, aka CaCO3, so it's only one substance.
compound
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A ground is a coating used to pepare a surface on which the paint is applied. In oil painting, it can typically be gesso (chalk or whitening in hide glue), white lead suspended in linseed oil or the more modern "acrylic gesso", which is not actually gesso but acrylic primer.