Химия для вступительных экзаменов на сестринские программы: лист заданий с ответами

Where are the transition metals located on the periodic table?

1. AIn group 18 on the far right
2. BIn group 1 on the far left
3. CIn the central block, groups 3 to 12
4. DAbove the noble gases

What is a solution?

1. AA mixture that is the same throughout (homogeneous)
2. BA pure compound made of two elements
3. CA solid that has been melted
4. DA mixture in which particles settle out on standing

What is the maximum number of electrons the first electron shell can hold?

1. A1
2. B8
3. C18
4. D2

What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?

1. AIt equals the group number
2. B−1
3. C+1
4. D0

Каковы продукты полного сгорания углеводорода, например метана?

1. AКислород и вода
2. BУгарный газ и водород
3. CУглерод и газообразный водород
4. DУглекислый газ и вода

Вы разбавляете 100 мл 2 М раствора до общего объёма 400 мл. Какова новая концентрация?

1. A2 М
2. B1 М
3. C0,5 М
4. D8 М

Burning a match is strongly exothermic, so why does it not catch fire until it is struck?

1. AThe match must first absorb all its energy from the air
2. BStriking makes the reaction endothermic
3. CStriking supplies the activation energy to start the reaction
4. DStriking pushes extra oxygen into the chemicals of the match head

Какой объём 6 М исходного раствора нужен для приготовления 300 мл 2 М раствора?

1. A150 мл
2. B900 мл
3. C100 мл
4. D50 мл