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

Which type of radiation is the most penetrating?

1. AAlpha particles
2. BBeta particles
3. CGamma rays
4. DThey are all equally penetrating

What is an acid–base indicator?

1. AA substance that neutralises every acid
2. BA substance that changes colour depending on pH
3. CA gas given off by acids
4. DA device that measures temperature

What does the coefficient 3 in "3H₂O" mean?

1. AEach water molecule has three oxygen atoms
2. BEach molecule of water contains three hydrogen atoms
3. CThere are three molecules (or moles) of water
4. DWater has a charge of 3

Dung dịch có pH 3 so với dung dịch có pH 5 thì thế nào?

1. ACó số ion hydrogen bằng nhau
2. BCó nhiều ion hydrogen hơn 100 lần
3. CCó ít ion hydrogen hơn 100 lần
4. DCó nhiều ion hydrogen hơn 2 lần

Why does the vapour pressure of a liquid increase as it is heated?

1. AThe molecules become heavier and press harder on the surface
2. BThe attractions between the molecules become stronger
3. CThe liquid's volume decreases and squeezes out vapour
4. DMore molecules have enough energy to escape into the gas phase

Why does keeping food in a refrigerator slow down spoilage?

1. ALower temperatures raise the activation energy of every reaction
2. BCold air contains no oxygen
3. CCold temperatures add preservatives to the food
4. DLower temperatures slow down chemical and microbial reactions

In the fission reaction ²³⁵U + ¹n → ¹⁴¹Ba + ⁹²Kr + ? ¹n, how many neutrons are released?

1. A3
2. B4
3. C1
4. D2

A liquid has a density of 1,2 g/mL. What is the mass of 250 mL of this liquid?

1. A208 g
2. B251,2 g
3. C300 g
4. D30 g