Inputs/Outputs
What are three possible inputs and outputs of Earth as a system?
Earth receives solar energy, water, gases, heat, and minerals while emitting heat, gases, and reflecting sunlight.
What happens to the matter that makes up wood when it is burned?
When wood is burned, its matter turns into gases and ash.
Whats a difference between Pyrite and Gold?
Pyrite has a higher Density and lower Malleability than gold.
The real gold sample has the density of gold, about 19.3 g/cm³, which can be used to identify it.
What happens to the identity of a substance during a physical change?
A substance retains its identity during a physical change, like melting or freezing.
Ductility is considered a
physical property
Classify the inputs or outputs of a forest
Inputs: nutrients, air, sunlight; Outputs: oxygen, wood.
False - Mass does not change after a chemical reaction, it follows the law of conservation of mass
What are physical properties of a substance? Give three examples.
Physical properties include density, melting point, color, malleability, and ductility
Give an example of a chemical change and explain why it is classified as such.
Burning wood is a chemical change because new substances like ash and gases are formed.
How do you know when a chemical reaction has occurred? Name at least two signs.
You know a chemical reaction has occurred if there’s gas production, an odor present, a temperature change, or if a precipitate forms.
Draw a diagram showing the inputs, outputs, and internal components of your classroom as a system.
A classroom system has inputs like students, books, and supplies, and outputs like homework, learning, and waste.
Provide an example of how oxygen atoms are involved in chemical changes. Hint - Your doing it right now
Oxygen atoms combine with carbon in burning to form carbon dioxide.
If a nail rust, is it the same substance? Explain your answer
If the two nails have the same density and other properties, they are likely made of the same substance.
What are some signs that a chemical reaction may have taken place?
Signs of a chemical reaction include color change, gas production, and temperature change.
What changes indicate a physical change only?
Change in volume, shape, appearance
As related to chemical reactions, outputs are also named?
Products
State the law of conservation of matter
Matter cannot be created or destroyed; it can only transform.
What is the significance of comparing multiple properties when identifying substances?
Comparing multiple properties helps ensure accurate identification of substances, reducing errors.
How do reactants and products differ in a chemical reaction?
Reactants are the starting materials, and products are the new substances formed in a chemical reaction.
Describe the changes that occur when baking soda is added to vinegar and why the balloon inflates.
When baking soda reacts with vinegar, carbon dioxide gas forms, inflating the balloon.
Identify and describe two examples of how matter moves through a cycle on Earth.
Matter moves through cycles in processes like the water cycle (evaporation, condensation) and the carbon cycle (photosynthesis, respiration).
Describe how energy is transformed when wood is burned in terms of thermal energy and light.
When wood burns, chemical energy transforms into thermal energy (heat) and light.
How can you determine whether two samples are the same substance using boiling point and freezing point?
If two samples have the same boiling and freezing points, they are likely the same substance.
Explain the difference between a chemical reaction and a physical change with examples.
A chemical reaction creates new substances (rust forming), while a physical change doesn't (ice melting).
Explain the difference between a chemical reaction and a physical change? Provide an example for each
A chemical reaction creates new substances (rust forming), while a physical change doesn't (ice melting).