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

What does the law of conservation of mass state?

1. AMass is neither created nor destroyed in a chemical reaction
2. BThe mass of products is always greater than the mass of reactants
3. CMass is lost as heat in every reaction
4. DGases have no mass

What is an empirical formula?

1. AA drawing of how the atoms are bonded
2. BThe actual number of each atom in one molecule
3. CThe mass of one mole of a compound
4. DThe simplest whole-number ratio of atoms in a compound

A food Calorie (written with a capital C) equals which amount of energy?

1. A1 joule
2. B1 kilojoule (1000 J)
3. C1 kilocalorie
4. D1 calorie

What is the shape of a water molecule?

1. ABent
2. BLinear
3. CTetrahedral
4. DFlat triangle

Theo thuyết động học phân tử, nhiệt độ đo đại lượng nào?

1. ATổng số hạt
2. BĐộng năng trung bình của các hạt
3. CKích thước của bình chứa
4. DKhối lượng của mỗi hạt

How does ionisation energy (the energy needed to remove an outer electron) generally change from left to right across a period?

1. AIt increases
2. BIt decreases
3. CIt first falls, then rises sharply
4. DIt stays the same

Many ethene (C₂H₄) molecules join together to form poly(ethene), a plastic. What type of reaction is this?

1. AHydrolysis, in which water breaks each monomer apart
2. BCondensation polymerisation, in which a water molecule is released at each new link
3. CCombustion, in which ethene reacts with oxygen
4. DAddition polymerisation, in which the C=C double bonds open up to link the monomers

An element has the electron arrangement 2, 8, 8, 2. Where is it on the periodic table?

1. AGroup 2, period 2
2. BGroup 2, period 4
3. CGroup 4, period 2
4. DGroup 8, period 2