Answer:
3.75 g.
Explanation:
<em>mass percent is the ratio of the mass of the solute to the mass of the solution multiplied by 100.</em>
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<em>mass % = (mass of solute/mass of solution) x 100.</em>
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mass of calcium nitrite = ??? g,
mass of the solution = 25.0 g.
∴ mass % = (mass of solute/mass of solution) x 100
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<em>∴ mass of solute (calcium nitrite) = (mass %)(mass of solution)/100</em> = (15.0 %)(25.0 g)/100 = <em>3.75 g.</em>
francium , in the Periodic table the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. making helium is the smallest element, and francium the largest.
Answer The earth is not flat
Explanation:cuz
Valence electrons are located in the outermost shell of the atom.
<u>Answer:</u>
<em>Burning gas on a stove top transforms chemical energy into thermal energy.</em>
<u>Explanation:</u>
Cooking food involves in two types of energies. <em>They are chemical energy and thermal energy.
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We use gas for a gas stove.Here gas is chemical energy.when we light the stove the fire lits up and here the <em>chemical energy energy is converted into thermal energy.</em>
Breaking and combining of bonds during combustion gives heat and light.This thermal energy heats the vessels and cooks the food through the <em>process of conduction, convection and radiation.
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