7.1 Chemical Reactions and Matter
What evidence shows a chemical reaction has occurred?
Color change, gas production, temperature change, or a new substance forms.
During a chemical reaction, atoms are not created or destroyed. What happens to them instead?
They are rearranged into new substances.
What process releases energy from food?
Cellular respiration
What do plants need to make food?
Sunlight, water, and carbon dioxide.
What is biodiversity?
The variety of living things in an ecosystem.
What gas is produced when a bath bomb reacts in water?
Carbon dioxide.
What is the Law of Conservation of Matter?
Matter cannot be created or destroyed.
What is the order of the organs in the digestive system?
1. Mouth 2. Esophagus 3. Stomach 4. Small intestine 5. Large intestine
What process allows plants to make glucose?
Photosynthesis
How can removing one species affect an ecosystem?
It can disrupt food webs and ecosystem balance.
Why might the total mass appear to decrease during a reaction in an open container?
Some matter, such as gas, may escape into the air.
What happens to energy during an endothermic reaction?
Energy is absorbed from the surroundings.
Where are villi found and what is their role?
They line the small intestines and absorb nutrients
Where does photosynthesis take place?
the leaves
Why are orangutans affected by palm oil production?
Their habitat is destroyed when forests are cleared to grow palm oil.
A student notices bubbles forming during a reaction. Why is this evidence of a chemical reaction?
A NEW gas is being produced.
Compare the energy changes that occur in exothermic and endothermic reactions.
Exothermic reactions release energy, while endothermic reactions absorb energy.
What is the term that matches the description "An enzyme that helps break starch into glucose"?
amylase
Is glucose a reactant or product of photosynthesis?
Product
Why are producers important to an ecosystem?
They provide energy for all other organisms
Explain how scientists use particle models to show that matter is conserved during chemical reactions.
The same atoms are present before and after the reaction, but they are arranged differently.
If a reaction releases energy to its surroundings, it is:
Exothermic
What is the term that matches the description "A carbohydrate your body cannot digest"?
fiber
Where does most of a tree's mass come from?
Carbon dioxide from the air.
In the desert, scientists have studied lizards, foxes, insects, and cacti and how energy flows within this ecosystem. How would scientists model a food chain using these organisms?
Sun - cacti - insects - lizards - foxes