Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

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

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

Co mówi liczba atomowa pierwiastka?

1. ALiczbę protonów w każdym atomie
2. BLiczbę neutronów w każdym atomie
3. CLiczbę atomów w jednym molu pierwiastka
4. DŁączną liczbę protonów i neutronów w jądrze

What is the half-life of a radioactive isotope?

1. AThe time taken for the mass of a sample to double in size
2. BThe time taken for half of the radioactive atoms in a sample to decay
3. CHalf the time it takes for all the atoms to decay
4. DHalf the number of protons in the nucleus

How is 0,00045 written in scientific notation?

1. A4,5 × 10⁴
2. B4,5 × 10⁻⁴
3. C4,5 × 10⁻³
4. D4,5 × 10⁻⁵

Why do group 1 metals such as sodium react so easily?

1. ATheir nuclei contain no neutrons
2. BThey have a full outer shell of electrons
3. CThey easily gain one extra electron
4. DThey have one outer electron that is easily lost

Which list is in order from smallest to largest mass?

1. AMilligram, kilogram, gram
2. BKilogram, gram, milligram
3. CGram, milligram, kilogram
4. DMilligram, gram, kilogram

Metal reaguje z kwasem i wydziela się gaz, który pali się z charakterystycznym szczeknięciem. Jaki to gaz?

1. AAzot
2. BWodór
3. CTlen
4. DDwutlenek węgla

Methane (CH₄) has four bonding pairs and no lone pairs on carbon. What is its shape?

1. ABent
2. BTetrahedral
3. CSquare planar
4. DTrigonal pyramidal