Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

What is a precipitate?

1. AAn insoluble solid that forms when two solutions react
2. BA gas that bubbles out when two solutions are mixed
3. CA liquid that forms when a solid melts
4. DA substance that speeds up a reaction

İyon nedir?

1. AHiç elektronu olmayan bir parçacık
2. BElektrik yükü taşıyan bir atom veya atom grubu
3. CÇekirdeğinde diğer atomlara göre fazladan nötron bulunan bir atom
4. Dİki özdeş atomdan oluşan bir molekül

Where are the metalloids found on the periodic table?

1. AIn group 1, at the far left edge of the table
2. BIn the two separate rows at the bottom of the table
3. CAlong the staircase line between the metals and the nonmetals
4. DIn group 18, at the far right edge of the table

What are London dispersion forces?

1. AWeak, temporary attractions caused by shifting electrons in molecules
2. BStrong bonds formed by transferring electrons
3. CAttractions between a hydrogen atom and a metal ion
4. DForces that hold protons together in the nucleus

Why does keeping food in a refrigerator slow down spoilage?

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

Why does water boil at a lower temperature at the top of a high mountain?

1. AGravity is weaker, so the molecules escape more easily
2. BThe air is colder, so the water loses heat and boils sooner
3. CThere is less oxygen dissolved in the water up there
4. DThe air pressure is lower, so less vapour pressure is needed to boil

Water is split as 2H₂O → 2H₂ + O₂. What volume of O₂ at STP (0 °C and 1 atm) forms from 2 mol of water?

1. A11,2 L
2. B44,8 L
3. C22,4 L
4. D67,2 L

An unknown element is shiny, conducts electricity, and reacts vigorously with water to form a basic solution and hydrogen gas. In which group is it most likely?

1. AGroup 1 (alkali metals)
2. BGroup 18 (noble gases)
3. CGroup 14 (carbon group)
4. DGroup 17 (halogens)