Atom by Atom — 7.PS1.1
These tiny building blocks make up all matter.
What are atoms?
Color, density, solubility, and melting point belong to this type of property.
What are physical properties?
Particles generally do this when the temperature of a substance increases.
What is move faster?
This law states that matter cannot be created or destroyed during a chemical reaction.
What is the Law of Conservation of Matter?
This term describes a new solid that forms when two liquids react.
What is a precipitate?
This is a pure substance made of only one type of atom.
What is an element?
A substance’s ability to burn belongs to this type of property.
What is a chemical property?
Particles that remain close together but can slide past one another represent this state of matter.
What is a liquid?
In a sealed container, 18 grams of one substance react with 27 grams of another. This is the total product mass.
What is 45 grams?
Two colorless liquids are combined, and a bright yellow solid appears. This type of change most likely occurred.
What is a chemical change?
A reaction causes the temperature to decrease from 24°C to 17°C. This term describes the reaction’s energy transfer.
What is an endothermic reaction?
Sugar completely dissolved in water forms this type of mixture.
What is a homogeneous mixture?
Particles in a solid remain in fixed positions but continue to move in this way.
What is vibrating?
The expression 3H₂O contains this many hydrogen atoms.
What are 6 hydrogen atoms?
A reaction causes the temperature to decrease from 24°C to 17°C. This term describes the reaction’s energy transfer.
What is an endothermic reaction?
A particle model shows one blue atom joined to two red atoms. This is the total number of atoms in the particle.
What are three atoms?
A bowl containing rice, black beans, and corn belongs to this type of mixture because its parts remain visible.
What is a heterogeneous mixture?
A soccer ball left outside on a cold day becomes softer because the gas particles inside undergo these two changes.
What are moving slower and colliding with less force?
This coefficient balances the equation N₂ + ___H₂ → 2NH₃.
What is 3?
Daily Double:
A student tests whether crushed or whole sugar cubes dissolve faster. The student uses 20°C water for the crushed cube and 60°C water for the whole cube. This is the problem with the investigation.
What is changing more than one variable?
A particle model contains both M–M particles and M–N particles. This is the most complete classification of the sample.
What is a mixture of an element and a compound?
Iron can still be removed from a sand-and-iron mixture with a magnet. This demonstrates what happens to the properties of substances in a mixture.
What is that each substance keeps its original physical properties?
Energy continues entering a substance, but its temperature remains constant while its particles leave fixed positions. This phase change is occurring.
What is melting?
In a sealed system, 28.0 grams of A react with 12.0 grams of B. The reaction produces 34.5 grams of solid C and this mass of gas D.
What is 5.5 grams?
Three sealed trials begin with 40.0 grams.
Trial A ends with 40.0 grams and no observable changes.
Trial B ends with 40.0 grams, forms a new solid, and increases in temperature. Trial C ends with 37.0 grams and shows no other changes.
This trial provides the strongest evidence of a reaction while also supporting conservation of matter.
What is Trial B?