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Which element is a metalloid?

1. ASulfur
2. BSodium
3. CSilicon
4. DArgon

In a chemical reaction, what is the limiting reactant?

1. AThe reactant that is left over at the end
2. BThe catalyst that controls the speed
3. CThe reactant that runs out first and stops the reaction
4. DThe reactant with the largest mass

แถวแนวตั้งของตารางธาตุเรียกว่าอะไร

1. Aหมู่
2. Bคาบ
3. Cอนุกรม
4. Dชั้น

What is the mass of 0.5 mol of NaCl (molar mass 58.5 g/mol)?

1. A0.5 g
2. B117 g
3. C58.5 g
4. D29.25 g

When a nucleus emits a beta particle, how do its mass number and atomic number change?

1. ABoth fall by 1
2. BMass number stays the same and atomic number rises by 1
3. CMass number falls by 4 and atomic number falls by 2
4. DMass number rises by 1 and atomic number stays the same

What does Avogadro's law state?

1. AOne mole of any gas has a mass of 22.4 g
2. BEqual volumes of gases at the same temperature and pressure contain equal numbers of molecules
3. CThe pressure of a gas doubles when its temperature is halved
4. DEqual masses of all gases contain equal numbers of molecules under any conditions

What is the net ionic equation for the neutralisation of any strong acid by any strong base?

1. ANa⁺ + Cl⁻ → NaCl
2. BH₂ + O₂ → H₂O₂
3. CH⁺ + Cl⁻ → HCl
4. DH⁺ + OH⁻ → H₂O

Alkanes follow the general formula CₙH₂ₙ₊₂. What is the formula of the alkane with 4 carbon atoms?

1. AC₄H₁₀
2. BC₄H₁₂
3. CC₄H₈
4. DC₄H₆