Answer:
Samira's model is incorrect because not all atoms are accounted for
Explanation:
The image of Samira's model has been attached to this answer to enhance the explanation.
What is depicted in that model is rightly regarded as a chemical change. In a chemical change atoms of substances are rearranged as new substances are formed.
However, all atoms in the products must also be found in at least one of the reactants. In this case we have an atom in one of the products that is not accounted for. Hence the model is incorrect.
Cytosine is a building block of DNA,
(brainliest would be appreciated)
<u>Explanation:</u>
Glycolysis is the metabolic pathway or cycle that transforms glucose (C6H12O6) into pyruvate, CH3COCOO−, and H+ by producing free energy, this supports in high-energy molecules like ATP (Adenosine triphosphate) and NADH (Nicotinamide adenine di-nucleotide) formation.
The presence of oxygen affect the chemical pathways which is used to extract energy from glucose in glycolysis process as in the presence of oxygen gas all hydrogens stripped off Acetyl CoA, two by two, to remove the electrons for the generation of ATP, until no hydrogen is left and all that remains of sugar is carbon-di-oxide, a waste product and water.
Answer : The number of grams of oxygen react must be, 170.4 grams.
Solution : Given,
Mass of 
= 46.85 g
Molar mass of = 44 g/mole
Molar mass of 
= 32 g/mole
First we have to calculate the moles of .
Now we have to calculate the moles of
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 1 mole of react with 5 mole of
So, 1.065 moles of react with 
moles of
Now we have to calculate the mass of
Therefore, the number of grams of oxygen react must be, 170.4 grams.
The acid yields H+ ions while the base yields OH- ions
