Types of Matter
What is the smallest unit of an element
What is an Atom
Which subatomic particle has a negative charge
What is the electron?
Is density a physical or chemical property?
What is physical
Melting ice is what kind of change?
What is a physical change?
What does the law of conservation of matter state?
Matter is not created or destroyed in a chemical reaction; mass of reactants = mass of products.
What type of mixture is a salad--Heterogeneous of homogeneous
What is Heterogeneous
What two subatomic particles are located in the nucleus?
What are Protons and Neutrons?
Which is a chemical property: color, melting point, or combustibility
What is combustibility?
Burning wood is what kind of change?
What is a chemical change?
Which type of heat transfer is sunlight warming the ground?
What is Radiation
Salt water is what type of mixture?
What is Homogenous?
What is the difference between and atom and a molecule?
An atom is the smallest unit of matter and a molecule is made of two or more atoms bonded together
Define Malleability
What is the ability to be hammered into sheets?
What are two clues that a chemical change has occurred?
Color change, gas production, energy released/absorbed, formation of a precipitate
Explain how convection currents transfer heat.
Warm fluids rise, cooler fluids sink, creating circular flow.
What is the difference between a compound and a mixture?
Compounds are chemically combined in fixed ratios; mixtures are physically combined in variable ratios
What is the charges of a proton?
What is positive?
What is the difference between reactivity and conductivity
Reactivity is how a substance chemically reacts; conductivity is how well it transfers heat/electricity.
When water boils, what happens to the arrangement of molecules?
They move freely and spread apart as a gas.
In a chemical reaction, why does the mass of products equal the mass of reactants?
Because atoms are rearranged, not lost or created
Classify H₂O, NaCl, and CO₂ (What are they)
What are compounds?
Which element has the greatest number of electrons: Na, Se, Po, or U?
What is uranium (U)?
Give two examples of chemical properties
Reactivity, combustibility, ability to rust, flammability, etc
Fireworks show color changes and release energy. Is this physical or chemical? Explain.
Chemical – color/energy release means a new substance is formed
A student reacts baking soda and water. If the original mass of baking soda is 50 g, the gas released weighs 5 g, and the liquid left is 220 g, what was the mass of water?
175g