Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

Which property is typical of bases?

1. AThey taste sour
2. BThey have a pH below 7
3. CThey turn blue litmus red
4. DThey feel slippery

What is the half-life of a radioactive isotope?

1. AHalf the time it takes for all the atoms to decay
2. BThe time taken for half of the radioactive atoms in a sample to decay
3. CThe time taken for the mass of a sample to double in size
4. DHalf the number of protons in the nucleus

What is plasma, as a state of matter?

1. AA solid that conducts electricity
2. BThe liquid part of blood
3. CA very hot gas in which atoms have lost electrons and become ions
4. DA liquid that has been cooled below its freezing point

2H₂ + O₂ → 2H₂O tepkimesinde 3 mol oksijenden kaç mol su oluşur?

1. A2 mol
2. B3 mol
3. C6 mol
4. D1,5 mol

Why does keeping food in a refrigerator slow down spoilage?

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

What are London dispersion forces?

1. AStrong bonds formed by transferring electrons
2. BAttractions between a hydrogen atom and a metal ion
3. CForces that hold protons together in the nucleus
4. DWeak, temporary attractions caused by shifting electrons in molecules

Hangi örnek en çok sayıda atom içerir?

1. A1 mol He
2. B1 mol CH₄
3. C1 mol O₂
4. D1 mol H₂O

Bir madde 801 °C'de eriyor, katı hâlde iletmiyor ama erimiş hâlde iletiyor. En olası olarak ne tür bir maddedir?

1. ABir metal
2. Bİyonik bir bileşik
3. CBasit kovalent (moleküler) bir madde
4. DBir soy gaz