Which contributes to the dissolution of sugar in water? a. the dissociation of an ionic compound in water b. a strong pull of water molecules on an ionic compound c. the dissociation of a polar covalent compound in water d. a strong pull of water molecules on a polar covalent compound
Option C: The dissociation of a polar covalent compound in water.
Sugar is made up of sucrose molecules containing polar covalent bonds. They have same type of oxygen-hydrogen covalent bonds that are present in water.
Since, sugar is not an ionic compound, option a and option b are incorrect. Also, due to same type of bonding in water and sugar molecules there will be no such force of attraction between them, this will opt out the option d.
Thus, dissolution of sugar in water is the dissociation of a polar covalent compound in water and option c is correct.
The molecular formula is Fe₂O₃
The molar mass of the compound is 199.55 g/mol; this means that if we have 1 mol of the compound, we'd have 199.55 g, we'd also have:
- 199.55 * 69.96/100 = 139.57 g of iron
- 199.55 * 30.06/100 = 59.98 g of oxygen
Now we calculate the moles of each element present in the given masses, using their atomic masses:
- 139.57 g Fe ÷ 55.84 g/mol = 2.50 mol Fe
- 59.98 g O ÷ 16 g/mol = 3.75 mol O
Then in 1 mol of the compound, there's 2.50 mol Fe and 3.75 mol O:
We convert the coefficients into integers (Divide them by the lowest number among them and multiply them by two):
An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOz). Combustion of 2.50g of this compound produced 3.67g of carbon dioxide and 1.50g of water. How many moles of carbon, C, were in the original sample?
C + O2 = CO2
Molar mass CO2 = 44 g/mol
3.67 g CO2 * 1 mol / 44 g =
=0.0834 mol CO2 = 0.0834 mol C
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2. Distilled water does not have H+ & OH- ions, hence only H-bonds exist between the water molecules.
3. There are covalent bonds between the individual sugar molecules.
4. There are ionic bonds between the Na+ & Cl- ions in NaCl.
5. There are p.d.-p.d. forces of attraction between the Na+ ions and the O2- partial ions of the water molecules as well as between the Cl- ions and the H+ partial ions of the water molecules. There are also H-bonds between the individual water molecules and ionic bonds between the Na+ & Cl- ions (although these are in much lower abundance than in unsolvated solid NaCl).
6. There are i.d.-i.d. as well as p.d.-p.d. forces of attraction between the sugar molecules and the water molecules. There are also H-bonds between the individual water molecules and covalent bonds within the sugar molecules.
Water has high heat specific capacity. Heat specific capacity is the amount of heat that is needed to raise the temperature of one gram of particular substance by one degree Celsius. The high specific heat capacity of water is due to the hydrogen bond that exist among the molecules of water. The hydrogen bond is quite strong and it will take a lot of heat to break the bonds. Thus, it takes a lot of heating to increased the temperature of water by one degree Celsius. This is also the reason why water has high boiling point.
Which of these is a property of a substance that is composed of atoms that are held together by ionic bonds? It can be shaped into wires. It has a low melting point. It conducts electricity when in solid form. It conducts electricity when it is dissolved in water.
Answer: Option (D) is the correct answer.
A ionic compound will have opposite charges on the 2 atoms attached to each other.
When ionic compound is in solid state then atoms will be more closer to each other and also due to the opposite charges the molecules will have strong force of attraction between them.
In order to conduct electricity, free movement of ions is required. So, a solid with ionic bonds is not able to conduct electricity as molecules or ions are closely held together.
Whereas when a substance that is composed of atoms that are held together by ionic bonds is dissolved in water then its ions will start to move freely from one point to another. Thus, this solution will be able to conduct electricity.
Thus, we can conclude that out of the given options, conducts electricity when it is dissolved in water displays a property of a substance that is composed of atoms that are held together by ionic bonds.
Sing pure water, set the room temperature to -10.0 °C and observe. What do you notice about the water temperature as the water is freezing? The water temperature stays constant at 0.0 °C as the water is freezing. The water temperature stays constant at 10.0 °C as the water is freezing. The water temperature continues to decrease as the water is freezing. The water temperature continues to increase as the water is freezing.
This is the fourth macro-molecule being described.
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All the three phases coexist at triple point.
The triple point of water is 0.01°C (273.16K) and 4.58 mmHg. At this temperature and pressure the water exist in all the three forms or phases.
The three phases are solid, liquid and gas.
It is like water is boiling and freezing at the same time.
If we change temperature or pressure, even slightly, one of the phases of water will disappear (based on changes made).
Which statement best relates the strength and concentration of a base? At high enough concentrations, a weak base becomes strong. Even at low concentrations, a strong base is strong. A weak base always has a low concentration. The stronger the base, the higher its concentration.
Answer: Option (b) is the correct answer.
When there are more number of hydroxide ions in a solution then there will be high concentration of or hydroxide ions. As a result, more will be the strength of base in that particular solution.
A base is strong when it readily dissociate into its ions in the solution. When a base is strong, then it does not matter at what concentration it is dissolved in the solution because despite of its low concentration it will remain a strong base.
Thus, we can conclude that out of the given options, the statement even at low concentrations, a strong base is strong best relates the strength and concentration of a base.
A trisubstituted cyclohexane compound is given below in its chair conformation. Draw the corresponding planar (overhead) representation, using wedge-and-dash bonds to indicate the substituent positions. To be graded properly, include the hydrogen atoms on the chirality centers (asymmetric carbons). Be sure that both wedge/dash bonds are drawn on the outside of the ring, or else the stereochemistry may be interpreted as square planar.
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Answer: Chlorine has the strongest attraction for electrons in bond formation.
Chlorine is highly electronegative as compared to iodine and has high electron gain enthalpy. So, it will readily accept an electron in order to complete its octet. The electronegativity decreases down the group from Cl to I, and hence the tendency to gain an electron decreases.
In case of Barium, and Strontium there are completely filled sub shells and therefore the tendency to gain an electron is the least.
Thus, it can be concluded that chlorine has the strongest attraction for electrons in bond formation.
How can you tell if an object has elastic properties? A.)If two people pulls on it in opposite directions it falls apart B)If two people pull on it ,it maintains its original size and shape C)if two people pull on it in opposite directions ,it stretches and remains in a new shape D.)if two people pull on it in opposite direction,it stretches.Then when they let it go, it turns to its original size and shape
your answer is hydrogen bond.
Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the water tastes salty. What kind of change has occurred? a) It’s a chemical reaction because a new substance has formed. b) It’s a physical change because the water and the salt kept their original properties. c) It’s an example of synthesis because two substances reacted to give one substance. d) It’s a chemical reaction because the water now tastes salty but originally did not
Answer: Option (b) is the correct answer.
When a teaspoon of salt is dissolved in water then it will completely dissociate into ions forming a homogeneous solution.
This is because particles of salt will evenly distribute into ions in the water.
This is a physical change as salt has dissociated into its ions and it has not chemically combined to the water molecules.
Hence, both salt and water will retain their chemical; properties.
Thus, we can conclude that in the given situation it’s a physical change because the water and the salt kept their original properties.
Two new planets with equal masses are discovered. Planet A is twice as far from the sun as Planet B. Which of the following is true? A. The gravitational pull between Planet A and the sun is smaller than the gravitational pull between Planet B and the sun. B. The sun's gravitational pull on Planet A is equal to its gravitational pull on Planet B because distance does not affect gravity. C. The gravitational pulls between the sun and each of the planets are the same because the masses of the planets are the same. D. The sun will attract Planet B and repel Planet A.
Answer: The products formed are potassium nitrate and silver bromide ( AgBr ).
Explanation: Double replacement or double displacement reactions are the reactions in which the positive ions and negative ions of the two reactants interchange to form the products. These reactions are carried out on the basis of their position in reactivity series.
The elements lying above in the reactivity series will be able to displace the elements that lie below in the reactivity series.
For the reaction of potassium bromide and silver nitrate, the reaction follows:
The resulting products are potassium nitrate and silver bromide ( AgBr ).
uneven distribution ------> polar
even distribution -------> non-polar
What is the relationship between the atomic numbers and ionic radii of the elements in the group 2A? What is the relationship between atomic numbers and first ionization energies? (2A group) Why do these relationships exist? Propose an explanation for each of these relationships. (2A group) Are these relationships consistent with the periodic trends that you have been studying? (2A group)
As the atomic number increases, the first ionization energy decreases.
These trends both exists because as we proceed down the group, the size of the atom increases due to addition of an electron shell. The increased number of electrons increase the shielding effect, meaning the ion is not held together as tightly, increasing its size, and the outer most electrons are not pulled towards the nucleus as strongly, making it easier to remove them.
3Ba + N2 ------> Ba3N2
Water is a very unique substance because it can exist in all three phases of matter (solid, liquid, gas) within the normal temperature ranges found on Earth. When one observes the phase of matter of water, one observes a ________ property of matter.
Physical Because changing phases such as solid, liquid, gas are physical forms.