Question

h₂o₂ (hidrógeno y oxígeno) *
2 puntos
tu respuesta
sulfuro de calcio (ca y s) *
2 puntos
tu respuesta
tetraóxido de pentacarbono *
1 punto
c₅o₉
c₅o₄
c₇o₉
c₂o₉

Explanation:

First Sub - Question: $\boldsymbol{H_2O_2}$ (hidrógeno y oxígeno)

Step 1: Identify the elements and their prefixes/suffixes

Hydrogen is "hidrógeno" and oxygen is "oxígeno". In the formula for hydrogen peroxide, we use the chemical symbols and the appropriate subscripts. The formula for hydrogen peroxide is determined by the valency of hydrogen ( + 1) and oxygen in peroxide form ( - 1). So, for every 2 hydrogens (each + 1) and 2 oxygens (each - 1), the formula is $H_2O_2$.

Step 1: Determine the chemical formula from the name and elements

Calcium (Ca) has a valency of + 2 and sulfur (S) in sulfide form has a valency of - 2. To form a neutral compound, the ratio of Ca to S is 1:1. So the chemical formula is $CaS$.

Step 1: Analyze the prefixes in the name

"Pentacarbono" means 5 carbon atoms (penta - = 5) and "tetraóxido" means 4 oxygen atoms (tetra - = 4). So the chemical formula should have 5 C atoms and 4 O atoms, which is $C_5O_4$.

Answer:

$H_2O_2$ (This is the chemical formula for hydrogen peroxide, formed from hydrogen and oxygen. The subscripts 2 for H and 2 for O are based on the oxidation states and the structure of the peroxide ion.)

Second Sub - Question: sulfuro de calcio (Ca y S)