What role do acids and bases play in our digestion

Answers

Answer 1

Answer: Acids and bases have imortant role to play in our digestion.

When food is moved into the stomach hydrochloric acid reacts with it to make the food medium acidic so that enzyme pepsin can act on it.

When food is moved into intestine, the acidic food medium is converted into an alkali (base) so that enzymes from pancreas and liver can act on it.

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Which substance can not be broken down by a chemical change?A) methane B) propanal C) tungsten D) water

Compared to H2S, the higher boiling point of H2O is due to the1.
greater molecular size of water
2.
stronger hydrogen bonding in water
3.
higher molarity of water
4.
larger gram-formula mass of water

Answers

$\rm H_2O$ has higher boiling point than $\rm H_2S$ , as there has been stronger hydrogen bonding in $\rm H_2O$ . Thus, option 2 is correct.

The boiling point has been the temperature at which the liquid has been converted to the gaseous form. The boiling point has been based on the intemolecular attractions between the atoms.

Higher boiling point

Based on the intermolecular interactions, the compound with higher intermolecular force required more energy to break the bond and change the state, and thus have high boiling point.

The hydrogen sulfide and water has hydrogen bonding. The hydrogen bonding has been based on the electronegativity of the atom involved. The more electronegative atom, stronger will be hydrogen bonding and thereby higher boiling point.

In $\rm H_2S$ and $\rm H_2O$ , the oxygen has been more electronegative than sulfur and thus results in stronger hydrogen bonding.

Thus, $\rm H_2O$ has higher boiling point than $\rm H_2S$ , as there has been stronger hydrogen bonding in $\rm H_2O$ . Thus, option 2 is correct.

Learn more about boiling point here:

brainly.com/question/2153588

Answer:

2, stronger hydrogen bonding

Explanation:

Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium?1.)oxygen + lithium oxide to lithium

2.)lithium + oxygen to lithium oxide

3.)oxygen + lithium to lithium + oxide

4.)lithium oxide to lithium + oxygen

Answers

The correct answer is the second option. The wordequation that would represent the formation of lithium oxide from lithium metal and oxygen is:

lithium + oxygen to lithium oxide

Inchemical symbols, the balanced chemical equation is expressed as:

Li + O2 = Li2O

Answer : The correct option is, (2) lithium + oxygen to lithium oxide

Explanation :

When the lithium react with the oxygen to give lithium oxide as a product.

The balanced chemical reaction will be,

$2Li+O_2\rightarrow Li_2O$

This reaction can be represented in words as,

Lithium react with oxygen to give lithium oxide.

or,

lithium + oxygen to lithium oxide

Hence, the correct option is, (2) lithium + oxygen to lithium oxide

at standard pressure how do the boiling point and the freezing point of NaCl compare to the boiling point and freezing point of H2O

Answers

Usually in this context you would be referring to the boiling and freezing point of a NaCl solution (saltwater) compared to pure H_{2}O. Sematics would be different for NaCl compound itself, you would say melting and boiling point for a solid substance- and the temperatures would be very, very radical (high).
The boiling point of pure water is 100 degrees C (212 F), and the freezing/melting point is below 0 degrees C (32 F). For a salt water solution, the boiling point is raised and the melting point is lowered. This means that water will stay liquid for an increased range of temperature. Depending on the amount of NaCl solute in the water, the boiling and melting points may change a few degrees.

Which has should only be produced in a fume hood?a. Cl2
b. CO2
c. H2
d. H2O

Answers

The gas that should only be produced in a fume hood is a. Cl2.
Chlorine gas is toxic gas. Upon inhalation, it irritates the pulmonary tract and damages the respiratory tract. Both short term and long term exposure to Cl2 gas are known to have destructive effects.

Persamaan kimia bagi magnesium

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English please ..I don't understand this.

Which of these observations are not explained by kinetic-molecular theory?

Answers

Answer:

At very low temperatures, gases expand less for a given pressure change than they do at high temperatures

The question's incomplete unfortunately, which observations?

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1-Propanol is combusted to provide heat. The equation and the enthalpy change for the process are shown below. C₃H₇OH(l)+4.5O₂( g)→3CO₂( g)+4H₂O(l)ΔH=−2,021 kJ Below is a list of sentences that describe a chemical process. Choose all of the sentences that apply to the above rea Check all that apply. a This process is exothermic. b The enthalpy change for 2C₃H₇OH(l)+9O₂( g)→6CO₂( g)+8H₂O(l) is 2,021 kJ c The enthalpy change for 2C₃H₇OH(l)+9O₂( g)→6CO₂( g)+8H₂O(l) is −4,042 kJ d The enthalpy change for 2C₃H₇OH(l)+9O₂( g)→6CO₂( g)+8H₂O(l) is −2,021 kJ e This chemical process transfers heat from the surroundings to the system. f The enthalpy change for 2C₃H₇OH(l)+9O₂( g)→6CO₂( g)+8H₂O(l) is 4,042 kJ g This process is endothermic. h This chemical process transfers heat from the system to the surroundings.

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