<span>It rises confidence for the reason that the more times you conduct the similar experiment over and over should either demonstrate your hypothesis right and wrong and remove any random incidences that might touch your results. Meaning it permits to have a more accurate measure or conclusion.</span>
Answer:
They are all alkali earth metals.
Explanation:
Their valence shell each has 2 electrons. Also, they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure. They form alkaline solutions, hydroxides, when reacting with water and their oxides are found in the earth’s crust.
The strategy for balancing the equations is by looking at the number of atoms on each side of the equation and adding coefficients to the molecules.
<h3>What is a balanced equation?</h3>
A balanced equation is an equation for a chemical reaction where the number of atoms for each element in the reaction and the total charge is the same for the reactants and the products,
A strategy that will help balance equations more quickly is balancing by inspection. Here, you look at how many atoms you have on each side of the equation and add coefficients to the molecules to balance out the number of atoms.
Learn more about atoms on:
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Answer: C.X2Y4
Explanation:
Given that :
Compound has the empirical formula :
Empirical formula : CY2
The empirical formula expresses in Lowest term the whole ratio of the compound.
.
Empirical. Formula is usually written as :
XnYn+1
For instance, the ratio of the compound is :
n : n+1
Therefore, in the question:
XY2
Ratio :
X = 1 ; Y = 2 ; 1 /2 ;hence, the possible molecular number :
The possible moleculars are those whose XY mole ratio is 1 : 2
Comparing the ratios :
X2Y8 = 2/8 = 1 :4
ХЗҮЗ = 3/3 = 1 : 1
X2Y4 = 2 /4 = 1: 2
ХЗҮ9 = 3/9 = 1 :3
Hence, the only possible molecular formula is X2Y4