Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

Where do the mole ratios used in stoichiometry come from?

1. AThe subscripts in each formula
2. BThe coefficients of the balanced equation
3. CThe physical states of the substances
4. DThe molar masses of the reactants

What does the coefficient 3 in "3H₂O" mean?

1. AThere are three molecules (or moles) of water
2. BEach water molecule has three oxygen atoms
3. CEach molecule of water contains three hydrogen atoms
4. DWater has a charge of 3

According to the kinetic molecular theory, how do gas particles move?

1. AOnly when heated, and then in neat lines between the walls
2. BConstantly, randomly and in straight lines between collisions
3. CSlowly in fixed positions
4. DAlways in a single direction, set by the pull of gravity

A solution has a pH of 10. What is its pOH at 25 °C?

1. A14
2. B10
3. C4
4. D24

Which halogen is the most reactive?

1. ABromine
2. BIodine
3. CFluorine
4. DChlorine

When diluting a concentrated acid, which method is safe?

1. AAdd the water slowly to the acid
2. BMix them in any order, as long as it is fast
3. CAdd the water quickly to the acid
4. DAdd the acid slowly to the water

Zinc reacts as Zn + 2HCl → ZnCl₂ + H₂. What mass of zinc (65 g/mol) reacts completely with 50 mL of 2 M HCl?

1. A3,25 g
2. B6,5 g
3. C1,63 g
4. D65 g

2090 J of heat is added to 50 g of water (specific heat 4,18 J/g·°C). By how much does its temperature rise?

1. A5 °C
2. B10 °C
3. C20 °C
4. D41,8 °C