Kate has a sample of an unknown solid. She performed a series of experiments to determine some of its properties. Her experiments are described in the chart.
Experiment Procedure
1 Place the sample over heat and determine at which temperature it changes state.
2 Expose the sample to an acid, a base, and water and observe the result.
3 Measure the volume and mass of the sample and divide them.
4 Place the sample in contact with oxygen gas and flame and observe the result.
Which of the following is correct about Kate's experiments?
A.
Experiments 1 and 3 were to find chemical properties.
B.
Experiments 1 and 2 were to find physical properties
C.
Experiments 3 and 4 were to find physical properties.
D.
Experiments 2 and 4 were to find chemical properties.
B. Experiments 1 and 2 were to find physical properties.
Are you sure explain
Yes, I am sure.
Experiment 1, where Kate placed the sample over heat to determine at which temperature it changes state, is a physical property because it involves a change in physical state (solid to liquid or gas) without changing the chemical composition of the substance.
Experiment 2, where Kate exposed the sample to an acid, a base, and water and observed the result, is also to find physical properties. This is because the reaction with acid, base, and water would help determine how the sample reacts physically without changing its chemical composition.
Therefore, experiments 1 and 2 were to find physical properties of the unknown solid.
Which investigation could demonstrate a chemical property of iron? (1 point)
•Performing an investigation to show how iron can be flattened into sheets.
• Performing an investigation to show how iron can be drawn into a wire.
•Performing an investigation to show how iron reacts with oxygen to form rust.
• Performing an investigation to show how iron can conduct electricity and heat.
Performing an investigation to show how iron reacts with oxygen to form rust would demonstrate a chemical property of iron. Rust formation involves a chemical reaction between iron and oxygen, resulting in the formation of iron oxide. This chemical change demonstrates a chemical property of iron.
are you sure explain and include the answer please
Yes, I am sure.
When iron reacts with oxygen to form rust, a chemical reaction takes place between the iron metal and the oxygen in the air to produce iron oxide (rust). This process involves a change in the chemical composition of the iron as it combines with oxygen to form a new substance. Therefore, the formation of rust demonstrates a chemical property of iron.
The investigation that demonstrates a chemical property of iron is:
Performing an investigation to show how iron reacts with oxygen to form rust.