Answer:
d) He, Ar, Kr
Explanation:
To have similar chemical properties, elements must belong to the same period on the periodic table.
As a generally periodic trend, elements within the same group, have the same chemical properties.
So, the correct answer choice will draft elements from the same group.
- He, Ar and Kr belongs to the group of elements called the noble gases.
- They are an unreactive group of elements.
- They are found in the last group on the periodic table.
- These elements do not readily combine with other elements.
2. High tempertaure and low pressure
3. HCL,NH3,H20
4. higher collisions ieThe greater the number of gas molecules, higher will be the collision rate and hence the greater the pressure.
Explanation:
Expansion:
1. Suppose gas particles are moving in a linear fashion but if they collide with some thing they will fil that. This explains expansion theory of gases.
Fluidity: The gas molecules are in dependent of each other and have low density, they are in constant motion hence have fluidity.
low density: The gas molecules are far apart as compared to solid and liquid hence have low density.
compressibility: Due to the large distance between the gas molecules they collide with each other and vessel wall and when the space is constricted they start moving faster. They are elastic in nature.
Diffusion: Yes, because when gas is mixed it starts moving in the mixture randomly.
2. The molecules in real gas are at large distance. The high temperature and low pressure real gas would behave ideally. Because increase temperature would cause higher movement of gas particles.
3. HCL, NH3 and H2O are polar gases they will have relatively different attractive forces between them.
4. The greater the number of gas molecules, higher will be the collision rate and hence the greater the pressure.
5. The gas particles get closer, enough pressure not provided. It increases the kinetic energy as heat is produced due to compaction of molecules. The particles would not move and will become liquid causing volume to increase.
6. The gas molecules start moving rapidly, move farther apart .Volume and pressure also increases.
6 L of oxygen (O₂)
Explanation:
We have the following chemical reaction:
2 Mg + O₂ → 2 MgO
Now we calculate the number of moles of magnesium:
number of moles = mass / molar weight
number of moles of Mg = 12 / 24 = 0.5 moles
Taking in account the chemical reaction we devise the following reasoning:
if 2 moles of Mg react with 1 mole of O₂
then 0.5 moles of Mg react with X moles of O₂
X = (0.5 × 1) / 2 = 0.25 mole of O₂
mass = number of moles × molar weight
mass of O₂ = 0.25 × 32 = 8 g
Knowing the information given by the problem that 32 g of O₂ takes up 24 liters of space, we devise the following reasoning:
if 32 g of O₂ takes up 24 liters of space
then 8 g of O₂ takes up Y liters of space
Y = (8 × 24) / 32 = 6 L of O₂
Learn more about:
balancing chemical reactions
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Answer:
Lower the pH slightly
Explanation:
A buffer is defined as the mixture between weak acid and conjugate base. In the problem, acetic acid is the weak acid and sodium acetate the conjugate base.
When a strong acid as perchloric acid is added to a buffer, <em>the pH decreases slightly</em> because the acid reacts with conjugate base producing weak acid and not affecting directly the concentration of H⁺ ions.
