Химия для вступительных экзаменов на сестринские программы: лист заданий с ответами

According to the Arrhenius definition, what does a base produce in water?

1. ACarbonate ions (CO₃²⁻)
2. BHydroxide ions (OH⁻)
3. CChloride ions (Cl⁻)
4. DHydrogen ions (H⁺)

Какая частица атома имеет положительный заряд?

1. AФотон
2. BЭлектрон
3. CНейтрон
4. DПротон

What is an unsaturated solution?

1. AA solution with no solute at all
2. BA solution that holds the maximum possible solute
3. CA solution with undissolved solid at the bottom
4. DA solution that can still dissolve more solute

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

A solution has a pH of 10. What is its pOH at 25 °C?

1. A24
2. B4
3. C14
4. D10

A student tests how temperature affects the rate of a reaction. What is the independent variable?

1. AThe temperature
2. BThe type of beaker used
3. CThe reaction rate
4. DThe volume of acid, which is kept the same

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

1. AC₄H₆
2. BC₄H₈
3. CC₄H₁₀
4. DC₄H₁₂

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

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