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The following chemical equation represents the decomposition of ammonia. 2NH3 -- 3H2 + N2 Which of the following is true in all chemical reactions that result in decomposition?
oxygen
The water molecules began physically changing to another phase.
glass prism
coil
The mass of the products is equal to the mass of the reactants.
coiled
a base
CH4
object could not be used to test an electromagnet to find out if it is working?
oxygen
The water molecules began physically changing to another phase.
glass prism
coil
The mass of the products is equal to the mass of the reactants.
coiled
a base
CH4
Heat was applied to 500 milliliters of water until the temperature of the water reached 100 °C. What change happened to the water when it reached 100 °C?
oxygen
The water molecules began physically changing to another phase.
glass prism
coil
The mass of the products is equal to the mass of the reactants.
coiled
a base
CH4
Samantha is building an electric motor using a magnet and a length of thick wire. What shape must the wire have in order for her motor to work?
oxygen
The water molecules began physically changing to another phase.
glass prism
coil
The mass of the products is equal to the mass of the reactants.
coiled
a base
CH4
Which gas makes up about 20% of Earth's atmosphere?
oxygen
The water molecules began physically changing to another phase.
glass prism
coil
The mass of the products is equal to the mass of the reactants.
coiled
a base
CH4
Mr. Parsons is helping his science class build a device that will produce electricity with a rotating magnet. What else must be included in the device in order for it to produce electricity?
oxygen
The water molecules began physically changing to another phase.
glass prism
coil
The mass of the products is equal to the mass of the reactants.
coiled
a base
CH4
A substance with a pH of 9.2 is ________.
oxygen
The water molecules began physically changing to another phase.
glass prism
coil
The mass of the products is equal to the mass of the reactants.
coiled
a base
CH4
Which substance is a compound?
oxygen
The water molecules began physically changing to another phase.
glass prism
coil
The mass of the products is equal to the mass of the reactants.
coiled
a base
CH4
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