Law of Conservation of Matter
What are the four states of matter? Describe how the molecules move in each.
solid - vibrate in a fixed shape
liquid - slide past eachother
gas- fast, freely moving
plasma - electrically charged (ionized), move with extremely high energy
What is density?
How much mass in a given volume
Which symbolizes a molecule? A. Ne B. Fe C. H2 D. H20
What is D. H20
Which statement is true about the molecules in ice compared to the molecules in water vapor? A. molecules in ice have more energy than molecules in gas. B. The molecules in ice contain different atoms than the molecules in water vapor. C The molecules in ice are less free to move than the molecules in water vapor.
What is C.
What are the 5 signs of a chemical change?
1. Change in color · 2. Change in odor · 3. Production of a gas · 4. Formation of a precipitate · 5. Change in energy.
If reaction starts with 20g of reactants it should produce...
What is 20 g of products.
What is responsible for the difference in molecule speed?
What is heat
If a diet coke is floating on water what can you say about its density compared to the water its in?
What is the diet coke is less dense than the water it is in.
Name one characteristic of each... metal, nonmetal, and metalloid.
Metal- conductor
nonmetal- poor conductor
metalloid- semiconductor
Which of the following are PRODUCTS?
H2O + CO2 → HCO + HO
What is HCO and HO .
Heat causes liquid to change to water vapor by? A. filling the spaces between molecules B. causing molecules to move faster and farther apart C. increasing attraction between molecules.
What is B.
Vinegar reacts with baking soda to produce bubbles of gas. What does this tell us about the change?
What is it’s a chemical change because a new substance (carbon dioxide gas) forms?
The element Argon has an atomic number of 18 and an atomic mass of 40 . The element phosphorous has an atomic number of 15 and an atomic mass of 31 . How many more electrons does Argon have than Phosphorous.
What is 3 electrons
Kool-Aid is a ____ mixture and trailmix is a _____ mixture.
What is homogeneous and heterogeneous
Bob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher?
What is 1100 g.
Which statement below is true? A. Heat causes liquids to contract B. Heat causes liquids to expand C Heat causes air to leave gast tanks D. Heat causes air to flow into gas tanks
What is B
Is density a physical or chemical property?
What is a physical property.
How many protons, neutrons, and electrons does Na have. Na has an atomic number of 11 and atomic mass of 23.
What is 11 protons, 11 neutrons, and 12 neutrons
Why are all substance on the periodic table classified as elements?
What is because they can not be broken down into other substances.