Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

Which is a sign that a chemical reaction may have taken place?

1. AA gas is produced when two liquids are mixed
2. BA block of wax melts when it is heated
3. CWater freezes into ice when put in a freezer
4. DSugar dissolves completely when stirred into water

İyon nedir?

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

Which mixture is a suspension?

1. ASugar dissolved in water
2. BOxygen dissolved in water
3. CSand stirred into water
4. DSalt dissolved in water

A solution has a pH of 2. What is its hydrogen ion concentration?

1. A2 mol/L
2. B1 × 10⁻² mol/L
3. C1 × 10² mol/L
4. D1 × 10⁻¹² mol/L

Which measurement has three significant figures?

1. A0,00560
2. B56
3. C0,0056
4. D5,0006

Water has a high specific heat capacity. How does this help the human body?

1. AIt makes water a poor solvent for salts
2. BIt helps keep body temperature stable
3. CIt makes the blood more acidic
4. DIt allows oxygen to dissolve in water more easily

Magnesium burns as 2Mg + O₂ → 2MgO. What mass of MgO (40 g/mol) forms from 48 g of Mg (24 g/mol)?

1. A80 g
2. B48 g
3. C160 g
4. D40 g

Starch and cellulose are both made entirely of glucose units, yet humans can digest starch but not cellulose. Why?

1. AStarch contains nitrogen, which makes it easier to digest
2. BCellulose is really made of amino acids, not glucose, so stomach acid cannot break it
3. CThe glucose units are linked differently, and humans lack an enzyme to break cellulose's links
4. DCellulose dissolves in water, so it is lost from the gut