What can a chemical change be speeded up by?
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What is the limiting reactant if 4.0 g of Nh3 react with 8.0 g of oxygen?
1)What is not true of a scientific law?A) It must be verified by scientists around the world. B) It attempts to explain why things happen. C) It describes what happens in the world around us. D) It must be supported by many independent scientific investigations. 2)Observation and experimentation have led many scientists to accept a theory about the origin of the universe. This theory is called the Big Bang Theory. Scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. What makes this a scientific theory? A)It has been proven by several scientists independently, resulting in its being accepted as truth. B)It is based on the beliefs and opinions of the majority of the scientific community. C)It is an observation of the natural world that has been proven as fact. D)It is the best explanation that scientists can offer, based on many scientific investigations. 3)A scientist in Italy published his findings from a scientific investigation that he conducted. Other scientists from around the world conducted similar investigations to test the results. All of the investigations result in similar findings. What does this say about the findings of these investigations? A)They have been proven to be scientific fact because all the investigations gave similar findings. B)The findings are automatically promoted to a law because they were proven by so many scientists. C)They are ready to be published in the media and in text books as a new scientific theory. D)The results are considered more reliable because they were documented by separate investigations. 4)Which of the following is not an example of kinetic energy? A)mechanical energy B)nuclear energy C)electrical energy D)thermal energy
B.incomplete.
C.accurate.
D.unchangeable.
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Answer: The correct answer is-
C.accurate.
As per the information in the question, a group of scientists has proposed a new theory on Adaptation, which is accepted by majority of scientists worldwide. This indicates that the proposed theory is most likely to be accurate.
A scientific theory is an explanation of certain aspects of nature that is based on some facts as well as evidences. It is tested, observed, and proven right on the basis of repeated experimentation.
As the theory on Adaptation is accepted by majority of the scientists, it means that it is most likely to be accurate.
Thus, option C) is the right answer.
O2 only
MgO only
Mg and O2
Mg only
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Answer:
Explanation:
The volume of KBr required can be found by using the formula;
c is the concentration in M , mol/dm³ or mol/L
v is the volume in L or dm³
m is the mass in grams
M is the molar mass in g/mol
From the question;
m = 25.5 g
c = 0.716
Molar mass (M) of KBr = 39 + 79.9 = 118.9 g/mol
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Three ways to change the rate of a reaction are by increasing the concentration of reactants, changing the temperature, and adding a catalyst.
Three ways to change the rate of a reaction:
- Increasing the concentration of reactants: This increases the collision frequency between particles, leading to a higher reaction rate. For example, in the reaction between hydrogen and iodine to form hydrogen iodide, increasing the concentration of hydrogen and iodine will speed up the reaction.
- Changing the temperature: Higher temperatures increase the kinetic energy of particles, making them move faster and collide more frequently. This results in a faster reaction rate. Using an example, raising the temperature of the reaction between magnesium and hydrochloric acid will speed up the rate of reaction.
- Adding a catalyst: Catalysts are substances that speed up reactions by providing an alternative reaction pathway with lower activation energy. For instance, adding an enzyme catalyst like amylase to the reaction between starch and iodine will increase the reaction rate.
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The three main ways to change the rate of reaction based on principles that affect rates of reactions are concentration, temperature, and catalysts .let us describe them one by one further.
Three ways to change the rate of a chemical reaction are:
- Concentration Change: Increasing the concentration of reactants usually speeds up the reaction. This is due to more frequent collisions between particles, increasing the likelihood of successful collisions leading to product formation.
- Temperature Change: Raising the temperature accelerates reactions by providing more energy to reactant particles, increasing their kinetic energy, and promoting successful collisions.
- Catalysts: Adding a catalyst lowers the activation energy required for the reaction, making it easier for reactants to transform into products. Catalysts provide an alternate reaction pathway, allowing reactions to occur at lower energy levels and faster rates.
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Chemical digestion of carbohydrates and lipids begins in the mouth while chemical digestion of proteins begins in the stomach. That is option C.
Digestion of different nutrients in the body
Digestion of food ingested by an individual begins from the mouth and ends at the anus. It involves series of mechanical (mastication and peristaltic movements) and chemical process that helps in the breaking down of the food nutrients into the composition it can be assimilated.
Carbohydrate digestion starts from the mouth because the salivary amylase acts on starch and breaks it down to simple sugars.
Also in the mouth, the lingual lipase acts on lipids making them become tiny droplets and separate from the watery components.
At the stomach, the enzyme pepsin acts on protein and converts it to polypeptide.
Therefore, chemical digestion of carbohydrates and lipids begins in the mouth while chemical digestion of proteins begins in the stomach.
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Answer:
The answer is "c"
Chemical digestion of carbohydrates and lipids begins in the mouth, while chemical digestion of proteins begins in the stomach.
Explanation:
The chemical digestion is a catabolism process where enzymes hydrolyze the large macronutrients (lipids, carbohydrates, proteins) breaking them down into small molecules.
The metabolism of carbohydrates begins at the mouth, where the salivar amylases break the glucose bonds down of the amylose (vegetal source) into disaccharides and the ones of the glycogen (animal source) into polysaccharides. Then in the stomach the HCl hydrolyze disaccharides and in the small intestine the pancreas amylase enables the breakdown of the disaccharides into monosaccharides to be absorb.
The chemical metabolism of the lipids (short-chain) starts in the mouth when they are hydrolize by the action of lipase in saliva, breaking the glycerol fatty acid bonds down, forming diglycerides. Then the bile salts emulsify the lipids allowing that the fats are solubilized in the chyme, and after that the pancreas lipase breaks fats into fatty acids in the small intestine.
The digestion of protein initiates in the stomach through the action of the pepsin and then at the duodenum, the trypsin and chymiotrypsin secreted by the pancreas continue with the hydrolyzation of the peptidic bonds (carbon-nitrogen).