Chemical Reactions
The definition of a chemical reaction
What is a process where substances change to form new substances?
This causes day and night on Earth
What is the rotation of the Earth?
Materials that let electricity flow through them
What are conductors?
The main problem engineers try to solve when designing a bridge
What is a) length and/or b) stability?
This part of the plant makes food using sunlight
What are the leaves? (through photosynthesis)
Which of these three options is a sign that a chemical change has happened: melting, colours changing, or freezing?
What is colours changing?
The layer of gases that surrounds Earth and helps protect us from the Sun's harmful rays
What is the atmosphere?
This part of a circuit opens and closes to control the flow of electricity
What is a switch?
In the engineering design process, which of these three steps come first?
1. Test the design
2. Build the model
3. Identify the problem
What is Identify the problem?
The job of the skeleton in the human body
What is supporting the body and protecting organs?
The gas that's released when vinegar and baking soda is mixed and it fizzes
What is carbon dioxide?
This is not a type of rock: igneous, sedimentary, magnetic, or metamorphic
What is magnetic?
A battery stores this type of energy
What is chemical energy?
What we call a simple sketch or drawing of an idea before building it
What is a blueprint or design plan?
This body system includes the heart and blood vessels
What is the circulatory system?
True or false: you can always reverse a chemical reaction
FALSE
The process by which water from oceans, lakes, and rivers turns into vapour and rises into the air
What is evaporation?
The best conductor of these options: rubber, copper, or plastic?
What is copper?
True or false: Engineers only work with machines and never use creativity
FALSE
True or false: all living things are made of cells
TRUE
What we call the substances you start with in your chemical reactions
What are reactants?
This layer of the Earth is made of solid metal and is the hottest
What is the inner core?
The name we call the path that electricity travels through
What is a circuit?
The definition of a prototype
An early or first model of something used to test an idea
What we call an animal that eats only plants
What is a herbivore?