Chemistry test

Ice always floats on liquid water.

• Theory

• Hypothesis

• Observation

• Law

Birds evolved from dinosaurs?

• Hypothesis

• Theory

• Observation

• Law

Hot air is less dense than cold air because the component of hot air moving more?

• Theory

• Observation/Experminets

• Law

• Hypothesis

Yesterday high tide in San Francisco Bay occurred at 2:43 AM and 3:07 PM?

• Observation

• Theory

• Law

• Hypothesis

Gas mixture that contains more than 4% hydrogen in air are potentially explosives

• Observation/ Experiment

• law

• Hypothesis

• Theory

When 10 g of ice were added to 100mL of water at 25 the temperature of the water decreased to 15.5 C after the ice melted

• Observation/ Experiment

• Theory

• Law

• Hypothesis

The ingredients of Ivory soap were analyzed to see whether it really is 94.44% pure as advertised?

• Thoery

• Hypothesis

• Observation/ Experiment

• Law

Heat always flows from hot objects to cooler ones. not in the opposite direction?

• Hypothsis

• Observation/ Experiment

• Law

• Theory

What is the difference between a hypothesis and a theory? How are the two similar?

Which of the following item are examples of matter?

• Clouds

• Time

• stars

• the atmosphere

• car exhaust fums