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The Polish and Czech states arose on the territory of Eastern Europe at about the same time (late 9-10 centuries). Poland and the Czech Republic were inhabited mainly
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Using the electronic balance method, create an equation for the reaction proceeding according to the scheme: P + HNO3 + H2O – H3PO4 + NO ↑ 1.Write the
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2Р + 3Mg → Mg3P2 Mg3P2 – magnesium phosphide; Mg3P2 + 6H2O → 2PH3 ↑ + 3Mg (OH) 2 PH3 – phosphine; 2РН3 +
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A point on the plane has two coordinates x – abscissa, and y – ordinate. First, let’s determine whether the graphs of the functions y = 4 –
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Given: m (Al) = 1 kg = 1000 g To find: V (H2) -? Decision: 1) Write the equation of a chemical reaction: 2Al + 6HCl => 2AlCl3
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We know the value of the number π = 3.14, as well as the radius of the circle R = 3.3 cm. In order to determine the circumference
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The battery has an EMF of 12 V. The current in the circuit is 5A, and the voltage at the terminals is 10 V. Determine the short-circuit current.
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The reduction reaction of copper oxide is described by the following chemical reaction equation: CuO + H2 = Cu + H2O; One mole of hydrogen reacts with one
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Given: m (the mass of the taken spring pendulum) = 40 g (0.04 kg); k (value of the spring stiffness of the pendulum) = 2 N / m.
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education
From the reaction equation: 4P + 5O2 = 2P2O5, it can be seen that the formation of 1 mol of phosphorus (V) oxide requires 2 mol of phosphorus
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