Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

İzotoplar nedir?

1. AFarklı elementlerin nötron sayıları aynı atomları
2. BElektron kazanmış iyonlar
3. CAynı elementin proton sayıları farklı atomları
4. DAynı elementin nötron sayıları farklı atomları

What is the smallest particle of an element that still has the chemical properties of that element?

1. AA proton
2. BA nucleus
3. CAn electron
4. DAn atom

Which of these is a chemical property?

1. AFlammability
2. BColour
3. CBoiling point
4. DDensity

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction needs a catalyst
2. BThe reaction is exothermic
3. CThe reaction is at equilibrium
4. DThe reaction is endothermic

What percentage of the mass of water (H₂O, 18 g/mol) is hydrogen (H = 1 g/mol)?

1. AAbout 89%
2. BAbout 11%
3. CAbout 67%
4. DAbout 5,6%

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

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

Why does food cook faster in a pressure cooker?

1. APressure itself breaks down the food, regardless of temperature
2. BSteam is trapped, so the water boils at a lower temperature
3. CThe higher pressure lowers the boiling point
4. DThe higher pressure raises the boiling point, so the water is hotter

An isotope has a half-life of 8 days. How long does it take for 100 g to decay to 12,5 g?

1. A32 days
2. B24 days
3. C64 days
4. D16 days