ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

According to collision theory, what must happen for particles to react?

1. AThey must both be in the solid state at the same time
2. BThey must have the same mass
3. CThey must collide with enough energy and the right orientation
4. DThey must stay completely still next to each other

What is gamma radiation?

1. AA stream of helium nuclei with a positive charge
2. BHigh-energy electromagnetic radiation with no mass or charge
3. CA slow-moving electron
4. DA fast stream of protons from the nucleus

A cleaning solution has a pH of 12. How is it described?

1. ANeutral
2. BStrongly basic
3. CWeakly acidic
4. DStrongly acidic

The amino acid glycine has an –NH₂ group and a –COOH group. What are these two groups called?

1. AA phosphate group and a hydroxyl group
2. BA hydroxyl group and a methyl group
3. CA carbonyl group and an ester group
4. DAn amino group and a carboxyl group

Nitrogen is in group 15 of the periodic table. How many valence electrons does a nitrogen atom have?

1. A7
2. B5
3. C3
4. D15

In a reaction at equilibrium, a product is continuously removed. What happens?

1. AMore product keeps forming as the equilibrium shifts to the right
2. BThe reactants run out immediately
3. CThe reaction rate drops to zero
4. DThe equilibrium shifts to the left to form more reactants

Orange bromine water is shaken with two hydrocarbons. With hexene it turns colourless; with hexane it stays orange. What does this show?

1. AHexane contains a C=C double bond; hexene does not
2. BHexene contains a C=C double bond; hexane does not
3. CHexene is an alcohol and hexane is an acid
4. DBoth contain double bonds, but hexane reacts more slowly

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A11
2. B7
3. C14
4. D3