Cevaplı Hemşirelik giriş sınavları için kimya çalışma kâğıdı

Elements in the same period of the periodic table have the same number of what?

1. AProtons
2. BNeutrons
3. CValence electrons
4. DOccupied electron shells

İzotoplar nedir?

1. AAynı elementin nötron sayıları farklı atomları
2. BAynı elementin proton sayıları farklı atomları
3. CFarklı elementlerin nötron sayıları aynı atomları
4. DElektron kazanmış iyonlar

What colour does blue litmus paper turn in an acid?

1. ABlue (no change)
2. BRed
3. CGreen
4. DPurple

When a nucleus emits a beta particle, how do its mass number and atomic number change?

1. AMass number stays the same and atomic number rises by 1
2. BMass number rises by 1 and atomic number stays the same
3. CBoth fall by 1
4. DMass number falls by 4 and atomic number falls by 2

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

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

What is the formula of sodium sulfate, made from Na⁺ and SO₄²⁻ ions?

1. ANa(SO₄)₂
2. BNa₂SO₄
3. CNaSO₄
4. DNa₄SO₂

A strip of magnesium is burned in air and the white ash weighs more than the original strip. Why?

1. AMass was created during the reaction
2. BThe ash absorbed water from the flame
3. CMagnesium atoms became heavier when heated
4. DOxygen from the air has combined with the magnesium

In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?

1. ANa
2. BNaCl
3. CNa⁺
4. DCl₂