EASE 1 Grade 11 22-23 (number 41-75 is A level)

An ideal gas obeys the gas laws under all conditions of temperature and pressure

Which of the following are true for an ideal gas?

1.The molecules have negligible volume.

1. 2.There are no forces of attraction between molecules.

2. 3.The molecules have an average kinetic energy which is proportional to its absolute temperature.

• 1, 2 and 3

• 1 and 2

• 2 and 3

• 1 only

Answer explanation

Asumsi Untuk gas ideal

2. Molekul memiliki volume yang dapat diabaikan:

4. Tidak ada gaya tarik menarik antara molekul:

6. Molekul memiliki energi kinetik rata-rata yang sebanding dengan suhu absolutnya:

What is the electronic configuration of Mg²⁺?

• 1s² 2s² 2p⁶

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s²

Answer explanation

sesuai tujuan Mg menjadi ion untuk mempunyai elektron yg sama dengan gas mulia terdekat yaitu Ne

In acidic conditions, ammonia, NH₃, reacts with a proton, H⁺, to form ammonium NH₄⁺.

Which of the following dot-and-cross diagram correctly illustrate electron movement in this reaction?

• 
• 
• 
• 

Which dot-and-cross diagram represents the outer-shell electron arrangement in a nitrogen molecule?

• 
• 
• 
• 

Phosphine, PH₃, can react with a hydrogen ion, H⁺, to form the phosphonium ion.

Which type of bond is formed in this reaction?

• dipole-dipole forces

• dative covalent bond

• ionic bond

• hydrogen bond

Which dot-and-cross diagram shows the arrangement of outer shell electrons in a molecule of hydrogen chloride?

• 
• 
• 
• 

Answer explanation

H duplet

Cl oktet

Which of the following influence the value of the ionisation energy of an atom?

1.the amount of shielding by the inner electrons

2.the charge on the nucleus

3.the distance between the outer electrons and the nucleus

• 1,2 and 3

• 1 and 2

• 2 and 3

• 1 only

Which of the following statements describes first ionisation energy?

• the energy required to remove one mole of electrons from one mole of gaseous atoms

• the energy required to remove outermost electron from each atom in one mole of gaseous atoms

• the energy required to remove outermost electron from each atom in one mole atoms

• the energy required to produce one mole of ions from one mole of gaseous atoms

Which equation represents the second ionisation energy of an element X?

• X(g) → X⁺(g) + 2e^-

• X⁺(g) → X²⁺(g) + e^-

• X(g) + 2e^- → X^2-(g)

• X+(g) + e^- → X(g)

What is the electronic configuration of an isolated Ni²⁺ ion?

(Atomic number of Ni=28)

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s¹

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s²

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸