Užduočių lapas tema Chemija slaugos stojamiesiems egzaminams su atsakymais

Which process is exothermic (releases heat)?

1. AEvaporating water
2. BPhotosynthesis
3. CMelting a block of ice
4. DBurning methane gas

Kuri medžiaga yra bazė?

1. ACitrinų sultys (citrinų rūgštis)
2. BDruskos rūgštis (HCl)
3. CNatrio hidroksidas (NaOH)
4. DActas (acto rūgštis)

What is the molar mass of oxygen gas, O₂ (O = 16 g/mol)?

1. A8 g/mol
2. B32 g/mol
3. C16 g/mol
4. D48 g/mol

How should the volume of water in a graduated cylinder be read?

1. AFrom above the cylinder, at the top edge of the curved surface
2. BFrom below, at the highest point the water touches the glass
3. CAt eye level, from the bottom of the curved surface (meniscus)
4. DAt any angle, from the middle of the cylinder

What are London dispersion forces?

1. AStrong bonds formed by transferring electrons
2. BWeak, temporary attractions caused by shifting electrons in molecules
3. CAttractions between a hydrogen atom and a metal ion
4. DForces that hold protons together in the nucleus

Kaip temperatūros didinimas paprastai veikia reakcijos greitį?

1. AVisiškai sustabdo reakciją
2. BSumažina greitį
3. CPadidina greitį
4. DGreičiui įtakos neturi

A carboxylic acid reacts with an alcohol in the presence of an acid catalyst. What are the products?

1. AAn alkane and oxygen
2. BA salt and hydrogen
3. CAn ester and water
4. DAn amino acid and carbon dioxide

A solution of a strong acid has pH 2. It is diluted with water to 10 times its original volume. What is the new pH?

1. A20
2. B1
3. C0,2
4. D3