education
Scientists suggest that more than 10 million species of living organisms currently live on the planet. Therefore, it is very important to classify them, that is, to distribute
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education
FeO+H₂SO₄=FeSO₄+H₂O Fe(OH)₂+H₂SO₄=FeSO₄+H₂O Fe+H₂SO₄=FeSO₄+H₂↑
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education
Let’s designate the sides of the triangle (a and b) as x, then the base (c) will be equal to x – 3. Through the perimeter, we find
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education
Let a parallelogram ABCD be given. Pairs of sides AB and CD, AD and BC are parallel to each other and equal to each other. Pairs of angles
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education
How much gasoline is consumed in an internal combustion engine that drives a pump that draws 4 tons of oil from a depth of 1,500 meters? Motor efficiency
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education
How much heat must be imparted to a piece of ice with a mass of 50 g at 0 ℃ in order to melt it and heat the
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education
Given: m tech. (Ca) = 8 g ω approx. = 30% Find: n (CaO) -? Solution: 1) 2Ca + O2 => 2CaO; 2) ω (Ca) = 100% –
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education
What volume of hydrogen will be released during the interaction of 2.7 g of 25% hydrochloric acid with the amount of aluminum substance required for the reaction? How
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education
Let’s compose the equation of the calcium combustion reaction: 2Ca + O2 = 2CaO; The molecular weight of calcium is 40 g / mol. Let’s find the amount
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education
Two lamps with a resistance of 240 ohms are connected in series and connected to a mains voltage of 220 V. What is the current strength in each
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