Sec2 Diagnostic Test

What is the pH of the ammonia solution at the beginning of Rajiv's experiment before hydrochloric acid is added, according to the graph?

• 1

• 7

• 10

• 5

What type of chemical reaction occurs between ammonia solution and dilute hydrochloric acid?

• Oxidation

• Neutralization

• Precipitation

• Combustion

What observation is made when ammonia solution is added to copper sulfate solution?

• Clear solution

• Pale blue precipitate

• Green gas

• Red liquid

Which of the following is a characteristic of root hair cells?

• Small surface area

• Short and wide shape

• Large surface area

• Round shape

Which statement about gravity is true?

• The force of attraction between two objects is called gravity.

• The strength of gravitational force depends on the volume of each object.

• Gravity only works on objects that are close to the Earth.

• Gravity is a repulsive force.

Is it true that air resistance acts on objects in a vacuum?

• True

• False

Which tissue is found in the organ shown (plant leaf)?

• Muscle

• Neuron

• Palisade layer

• Stem

In the given reaction model, what product is produced from hydrogen and nitrogen?

• Water

• Oxygen

• Ammonia

• Methane

What is the main limitation of using particle models for chemical reactions?

• They perfectly represent all aspects of the reaction.

• They accurately show all energy changes.

• They do not show the actual size of atoms.

• They can represent physical changes but not chemical changes.

According to Lily's research on thermal energy transfer, what is the initial temperature of the water in Beaker 1 at 0 seconds?

• 90 °C

• 81 °C

• 85 °C

• 72 °C