Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

Ion là gì?

1. AMột nguyên tử hoặc nhóm nguyên tử mang điện tích
2. BMột hạt không có electron nào
3. CMột nguyên tử có thêm neutron trong hạt nhân so với các nguyên tử khác
4. DMột phân tử gồm hai nguyên tử giống nhau

What is a molecule?

1. AA mixture of two different elements
2. BThe nucleus of an atom
3. CTwo or more atoms held together by covalent bonds
4. DA single atom with a positive charge

What is a precipitate?

1. AA gas that bubbles out when two solutions are mixed
2. BA substance that speeds up a reaction
3. CAn insoluble solid that forms when two solutions react
4. DA liquid that forms when a solid melts

What is the formula of the hydroxide ion?

1. AOH⁺
2. BH₃O⁺
3. COH⁻
4. DO²⁻

When mercury(II) oxide is heated, it reacts as 2HgO → 2Hg + O₂. What type of reaction is this?

1. ASynthesis
2. BCombustion
3. CDecomposition
4. DSingle replacement

88 g carbon dioxide (khối lượng mol 44 g/mol) có bao nhiêu mol?

1. A3872 mol
2. B0,5 mol
3. C44 mol
4. D2 mol

Element A has 1 valence electron and element B has 7 valence electrons, both in period 3. Which statement best compares them?

1. AA is a nonmetal and B is a metal
2. BBoth are metalloids
3. CA is a reactive metal and B is a reactive nonmetal
4. DBoth are unreactive because they are in the same period

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. ASand, because it has a lower specific heat capacity than water
2. BSand, because it has a higher specific heat capacity than water
3. CBoth warm equally, because they absorbed the same heat
4. DWater, because it has a higher specific heat capacity than sand