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

What do the letters STP stand for in gas chemistry?

1. AStandard temperature and pressure
2. BStandard time and pressure
3. CStable temperature point
4. DSpecific temperature and particles

Một phương trình hóa học đã cân bằng cho biết điều gì?

1. ACó nhiều sản phẩm hơn chất phản ứng
2. BSố nguyên tử của mỗi loại là như nhau ở hai vế
3. CChỉ có các chất phản ứng của phản ứng
4. DSố phân tử là như nhau ở hai bên mũi tên, trước và sau phản ứng

What does the rate of a reaction measure?

1. AHow much product forms in total by the end
2. BHow hot the reaction gets
3. CHow much energy the final products contain
4. DHow quickly reactants are used up or products are formed

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

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

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAbout 14 g dissolves and about 36 g stays undissolved
2. BNone of the salt dissolves
3. CAll 50 g dissolves
4. DAbout 36 g dissolves and about 14 g stays undissolved

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. AIodine is strongly attracted to the metal ions stored in the neck
2. BIodine-131 is not radioactive inside the body
3. CThe thyroid gland takes up iodine to make its hormones
4. DRadiation is always drawn toward the head

A compound has the empirical formula CH₂ and a molar mass of 42 g/mol (C = 12, H = 1). What is its molecular formula?

1. AC₂H₄
2. BC₄H₈
3. CCH₂
4. DC₃H₆

How many atoms in total are in 0,5 mol of water, H₂O?

1. A9,03 × 10²³
2. B3,01 × 10²³
3. C1,81 × 10²⁴
4. D6,02 × 10²³