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Chemistry Puzzle

Across
More than one substances turning into other substances.
number of representative particles in a mole, 6.02 X 10²³
matter with a definite shape, volume, and not easily compressed.
Elements that conduct under circumstances.
One element replaces another to make a product.
Substance reacts with oxygen to make heat and light.
A chart that organizes all known elements into a grid of horizontal rows and vertical columns arranged by increasing atomic number.
The pressure required to support 760 mm of mercury in a mercury barometer at 25°C
Homogeneous mixture with particles so small that they cannot be seen with a microscope.
The temperature at which a solid changes into a liquid
Down
Particles in a atom with a positive charge.
An empty space with no particles and no pressure
One substance breaks down, into 2 more.
Force of attraction between opposite charges.
a nonmetal in group 7A of the periodic table
Two elements replace another to make a product.
Composed of two elements.
Has properties of both nonmetals and metals.
2 or more substances that combine to make another.
The whole name of the symbol of atomic number 16 in periodic table.
A device that is used to measure atmospheric pressure
The center of a atom.
Particles in a atom with a negative charge.
A substance in which the atoms of 2 or more elements are combined.
Atoms of the same element with different numbers of neutrons.