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

Read More
education

FeO+H₂SO₄=FeSO₄+H₂O Fe(OH)₂+H₂SO₄=FeSO₄+H₂O Fe+H₂SO₄=FeSO₄+H₂↑

Read More
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

Read More
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

Read More
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

Read More
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

Read More
education

Given: m tech. (Ca) = 8 g ω approx. = 30% Find: n (CaO) -? Solution: 1) 2Ca + O2 => 2CaO; 2) ω (Ca) = 100% –

Read More
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

Read More
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

Read More
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

Read More