Question 1

When planning a scientific investigation, which step comes first?

Accepted Answer

Define the problem using reference materials

Answer

Collect and organize data

Answer

Interpret data in charts and tables

Answer

Make predictions based on results

Question 2

Which phrase is most appropriate when discussing scientific results?

Accepted Answer

“Results support the hypothesis"

Answer

“The hypothesis is absolutely true"

Answer

“The experiment guarantees the conclusion"

Answer

“This proves the hypothesis is correct"

Question 3

What is essential in a scientific investigation?

Accepted Answer

Collecting relevant empirical evidence

Answer

Using imagination instead of data

Answer

Avoiding logical reasoning to prevent bias

Answer

Ignoring evidence that does not fit predictions

Question 4

Why are models useful in science?

Accepted Answer

They help relate results and explain phenomena

Answer

They eliminate the need for data collection

Answer

They replace the need for experiments

Answer

They provide conclusive proof of theories

Question 5

Which of the following is an example of a compound?

Accepted Answer

Sodium chloride (NaCl)

Answer

Nitrogen (N₂)

Answer

Gold (Au)

Answer

Oxygen (O₂)

Question 6

What property distinguishes acids from bases?

Accepted Answer

Acids have a pH less than 7

Answer

Acids produce hydroxide ions in water

Answer

Acids turn litmus paper blue

Answer

Acids feel slippery

Question 7

Which statement correctly relates pH to ion concentration?

Accepted Answer

A solution with high hydronium ion concentration has a low pH

Answer

A solution with equal hydronium and hydroxide ions has a pH of 1

Answer

A solution with high hydroxide ion concentration has a low pH

Answer

A solution with high hydronium ion concentration has a high pH

Question 8

Which of the following is a salt?

Accepted Answer

Sodium chloride (NaCl)

Answer

Ammonia (NH₃)

Answer

Hydrochloric acid (HCl)

Answer

Sodium hydroxide (NaOH)

Question 9

When designing a scientific investigation, which step is essential?

Accepted Answer

Use repeated trials for reliability

Answer

Collect data without organizing it

Answer

Make predictions without evidence

Answer

Avoid identifying variables

Question 10

Why are scientific theories rarely discarded?

Accepted Answer

They are supported by evidence and can be modified

Answer

They are based on opinions

Answer

They never change

Answer

They provide absolute proof

Question 11

Which of the following is a physical property that can be used to classify substances?

Accepted Answer

Density

Answer

Reactivity with acid

Answer

Ability to rust

Answer

Ability to burn in oxygen

Question 12

What happens to the density of a substance when the amount of the sample changes?

Accepted Answer

It stays the same

Answer

It decreases

Answer

It increases

Answer

It doubles

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