Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

What is an empirical formula?

1. AThe mass of one mole of a compound
2. BThe simplest whole-number ratio of atoms in a compound
3. CThe actual number of each atom in one molecule
4. DA drawing of how the atoms are bonded

What is a horizontal row of the periodic table called?

1. AA group
2. BA period
3. CA family
4. DA block

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

1. ASlowly in fixed positions
2. BAlways in a single direction, set by the pull of gravity
3. CConstantly, randomly and in straight lines between collisions
4. DOnly when heated, and then in neat lines between the walls

How can you get solid salt back from salt water?

1. AEvaporate the water
2. BFilter the solution
3. CUse a magnet
4. DFreeze the solution and lift out the salt

A patient's arterial blood pH is 7,25. How is this described?

1. ANormal
2. BNeutral
3. CAlkalosis
4. DAcidosis

Why is a carbon dioxide extinguisher effective on many fires?

1. ACO₂ adds oxygen to cool the flames
2. BCO₂ is a liquid that soaks into the fuel
3. CCO₂ reacts chemically with the fuel to make it non-flammable
4. DCO₂ is denser than air and pushes oxygen away from the fire

2 mol H₂ ir 2 mol O₂ sumaišomi ir reaguoja pagal 2H₂ + O₂ → 2H₂O. Kuris reagentas yra ribojantis?

1. ADeguonis, nes deguonies yra mažiau nei vandenilio
2. BNė vienas, nes kiekiai vienodi
3. CVandenilis, nes 2 mol H₂ sunaudoja tik 1 mol O₂
4. DVanduo, nes tai produktas

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

1. ANa⁺
2. BCl₂
3. CNa
4. DNaCl