1, Read the entire lab procedure through and make sure it is understandable. 2, Put on safety goggles and an apron. 3, Check the flask for chips and cracks. 4, <span> Use heat-resistant gloves or tongs to swirl the flask.</span>
Heat given out to the surroundings by the system = 225 J
Work done by the system on the surroundings = 645 J
According to the energy conservation, the energy can neither be created nor it can be destroyed, it can transform from one form to another. Hence, the energy which is lost to the surrounding as a work done and heat came from the internal energy of the system.
Hence, the change in the internal energy = - 225 - 645 = - 870 Joules
Negative sign means that the internal energy of the system is decreased by 870 Joules
Ionic charge for metals are always positive while the nonmetals have negative charges. The magnitude of charges in the periodic table increases from left to right.
The periodic table is a classification of elements according to their periodic properties.
Metals form positive ions while nonmetals form negative ions. However, the magnitude of ionic charge (positive or negative) increases from left to right in the periodic table.
For instance, group 1 elements form a charge of +1, group 2 elements form a charge of +2, group 3 elements have a charge of +3 and so on. The magnitude of charge continues to increases likewise across a period.
Learn more; brainly.com/question/81085
Answer:
im pretty sure its A or C im leaning more toward A tho
Explanation:
First we need to find the number of moles of both K and O reacted
K - 0.779 g / 39 g/mol
= 0.02 mol
the mass of O₂ reacted = 1.417 g - 0.779 g = 0.638 g
O₂ moles = 0.638 g / 32 g/mol
= 0.02 mol
the number of both K and O₂ moles reacted are equal
therefore stoichiometry of K to O₂ reacted are 1:1
then the formula of potassium superoxide is KO₂
