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They come in differing sizes.
bullentin board is 3 feet, chalk board is 4 feet,
For his work in theoretical physics, the primary took that Albert Einstein used was his brain. No doubt he also used pen or pencil and paper, and occasionally chalk and a chalk board.
For his work in theoretical physics, the primary took that Albert Einstein used was his brain. No doubt he also used pen or pencil and paper, and occasionally chalk and a chalk board.
supposedly came from the practice of writing what you owed at a pub on a chalkboard; later game scores (e.g., for darts) were also chalked up on a board.
Chalk is a mixture, not a solution. It is composed of various compounds including calcium carbonate, but these compounds do not dissolve into one another to form a uniform solution.
near a chalk board
Chalk
The Luhya translation of the English words 'chalk board' is "lisisi lie ichoka".
A compound word with chalk is chalkboard.
The number of moles in a teaspoon of chalk would depend on the mass of the chalk and its molar mass. You would need to know the molar mass of chalk and the mass of the teaspoon of chalk to calculate the number of moles using the formula: moles = mass (g) / molar mass (g/mol).
5x2x1.5
a chalk board
maybe it might be near the chalk on the board
You can use it in homemade toothpaste recipes in place of baking soda. Also used in the construction trade when 'snapping' a chalk line on a board, etc.
A chemical reaction is nothing but the conversion of the reactant molecules into product molecules. By increasing the surface area of the reactants more number of reactant molecules are exposed which eventually increases the rate of the reaction...for example, powdered chalk piece dissolves faster in water than a piece of chalk.
A chalk board eraser is an insulator. The foam or felt material used in erasers does not conduct electricity. This insulating property allows the eraser to effectively remove chalk marks without transferring any electrical charges.