Answer:
Explanation:
a) for 1.000 g X: 0.1621 g Y
ratio of mass of element Y = 2.100g : 0.1621g
= 1 : 0.07
b) 1.000 g X: 0.7391 g Y
ratio of mass of element Y = 2.100g : 0.7391g
= 1: 0.35 , = 20:7
c) 1.000 g X: 0.2579 g Y
ratio of mass of element Y = 2.100g : 0.2579g
= 1 : 0.12
d) 1.000 g X: 0.2376 g Y
ratio of mass of element Y = 2.100g : 0.2376g
= 1: 0.11
e) 1.000 g X: 0.2733 g Y
ratio of mass of element Y = 2.100g : 0.2733g
= 1 : 0.13
From the values obtained , the closest that is in compliance with the law f multiple proportions is option B
Chemical reaction can be reversed if the energy of the reactants is less than the activation energy threshold.
<h3>
What is a reversible reaction?</h3>
A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously.
<h3>Conditions for reversible reaction</h3>
In equilibrium reaction, the activation energy of the forward reaction is more than that of backward reaction which causes bond breakage of the reactants.
Activation energy = (Threshold energy) - (Internal energy of the reactants)
Thus, a chemical reaction can be reversed if the energy of the reactants is less than the activation energy threshold.
Learn more about reversible reaction here: brainly.com/question/16614855
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<u>Answer:</u> The concentration of 
ions are 2.797 ppm and 0.212 ppm respectively.
<u>Explanation:</u>
To calculate the mass of solution, we use the equation:
Volume of gold = 100 L = 100000 mL (Conversion factor: 1 L = 1000 mL)
Density of gold = 1.001 g/mL
Putting values in above equation, we get:
To calculate the concentration in ppm (by mass), we use the equation:
- <u>Calculating the concentration of calcium ions:</u>
Mass of 
ions = 0.280 g
Putting values in above equation, we get:
- <u>Calculating the concentration of magnesium ions:</u>
Mass of 
ions = 0.0220 g
Putting values in above equation, we get:
Hence, the concentration of ions are 2.797 ppm and 0.212 ppm respectively.
Answer:
C
Explanation:
The elements that will most likely lose an electron are those that are in Group 1. This is because they only have one valence electron in their outer shell. Atoms want to have 8 electrons in their outer shell and in order for the elements of Group 1 to do so, they could either lose one electron or gain 7 but losing one is easier to do. Out of these answer choices, the only one that belongs to Group 1 is potassium.
