Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in definite proportions, by chemical means. Compounds may be formed by combining atoms of their constituent elements by ionic bonds or by covalent bonds.
Answer:
30g
Explanation:
According to this question, a sulfur-containing compound is said to contain 15 percent by mass of sulfur. This means that 15% of the total mass of the compound is the mass of sulfur in the compound.
The question further states that there is a total of 200g of the compound containing sulfur, this means that the mass of sulfur can be calculated this:
Mass of sulfur = 15% of 200g
15/100 × 200g
15 × 2
30g
Hence, there are 30g of sulfur in 200g of the sulfur containing compound.
Answer:
For every three turns of the Calvin cycle, three atoms of carbon are fixed from three molecules of carbon dioxide.
Explanation:
In the carbon fixation reactions that occur in the stroma, NADPH and ATP, produced in the energy capture reactions, are used to reduce a three-carbon compound, glyceraldehyde phosphate. This route in which carbon is fixed by means of glyceraldehyde phosphate is called the three-carbon route or C3. In this case, carbon fixation is carried out through the Calvin cycle, in which the ribulose bisphosphate (RuBP) carboxylase enzyme combines a carbon dioxide molecule with the starting material, a five-carbon sugar called ribulose bisphosphate.
In each complete cycle, enter a molecule of carbon dioxide. The number required to make two glyceraldehyde phosphate molecules, equivalent to a six-carbon sugar, is six turns. Six molecules of RuBP, a compound of five carbons, are combined with six molecules of carbon dioxide, producing six molecules of an unstable intermediate that is soon cleaved into twelve molecules of phosphoglycerate, a compound of three carbons. The latter are reduced to twelve molecules of glyceraldehyde phosphate. Ten of these three-carbon molecules combine and regenerate to form six five-carbon RuBP molecules. The two "extra" molecules of glyceraldehyde phosphate represent the net gain of the Calvin cycle. These molecules are the starting point of numerous reactions that can involve, for example, the synthesis of carbohydrates, amino acids and fatty acids.
The energy that drives the Calvin cycle is the ATP and NADPH produced by the energy capture reactions in the first stage of photosynthesis.
Gliceraldehyde phosphate can also be used as a starting material for other organic compounds necessary for the cell. Other plants that live in dry and warm environments have mechanisms that allow them to initially fix CO2 in one of two ways, and thus minimize water loss. These pathways are known as the four-carbon pathway, or C4 and the CAM plant pathway, and precede the Calvin cycle.
Answer:
Lemon juice has lowest pH.
Explanation:
pH is the negative log of hydrogen ion concentration. By increasing the Hydrogen ion concentration pH will decrease.
pH = -log [H⁺]
According to pH scale,
The pH of 7 is consider neutral. The pH below the 7 is consider acidic and above the 7 is basic.
The sodium hydroxide is strongest base because it fully dissociate into ions.
It dissociate to gives the sodium and hydroxyl ions and solution became more basic.
NaOH → Na⁺(aq) + OH⁻(aq)
Its pH is 12. It is also known as caustic soda.
The pH of blood is vary from 7.35 - 7.45. it is slightly alkaline.
The pH of lemon juice is ranging between 2-3.
The pH of tap water is ranging between 6-8.5.
From above given information it can be noticed that lemon juice have lowest pH i.e 2-3. It is acidic, because its pH is less than 7.
Hi, your answer is correct.