Science
What is a scientific theory?
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and confirmed through observation and experimentation.
What is an independent variable?
An independent variable is the factor that is manipulated or changed in an experiment to test its effects on the dependent variable.
What is a synthesis reaction?
A synthesis reaction is a chemical reaction in which two or more substances combine to form a new compound (e.g., A+B→AB).
What is an element's atomic number?
An element's atomic number is the number of protons in the nucleus of an atom of that element.
What is a homogeneous mixture?
A homogeneous mixture is a mixture in which the components are uniformly distributed and cannot be distinguished (e.g., saltwater).
All of them
What is a pure substance?
A pure substance is a material with a consistent composition and distinct properties, such as water or sodium chloride.
What is a scientific model?
A scientific model is a representation of an object, system, or concept that helps to explain and predict phenomena.
What are indicators of a chemical change?
Indicators of a chemical change include color change, gas production, precipitate formation, and temperature change.
Where are the metals located?
Metals are located on the left side and the center of the periodic table.
What is a colloid?
A colloid is a heterogeneous mixture in which fine particles are suspended in a medium and do not settle out (e.g., milk).They exhibit the Tyndall effect.
Where was The Lord of the Rings filmed?
New Zealand
What is an atom?
An atom is the smallest unit of an element, consisting of protons, neutrons, and electrons.
What is a conversion factor?
A conversion factor is a ratio used to convert from one unit to another.
Describe a neutralization reaction.
A neutralization reaction occurs when an acid reacts with a base to produce water and a salt (e.g., HCl+NaOH→NaCl+H2O)
What is an ionic bond?
An ionic bond is a chemical bond formed between two ions with opposite charges, typically between metals and nonmetals.
How do you separate a solution?
Solutions can be separated by processes like evaporation or distillation, while suspensions can be separated through filtration.
Who was the most listened to artist, globally, on Spotify in 2024?
Taylor Swift
What is the difference between a gas, liquid, and solid?
The difference between a gas, liquid, and solid is in their particle arrangement and energy: solids have closely packed particles, liquids have more space allowing flow, and gases have widely spaced particles that fill the container.
What is scientific notation?
Scientific notation is a way of expressing numbers that are too large or too small in the form of a number between 1 and 10 multiplied by a power of ten.
What is the difference between endothermic and exothermic reactions?
Endothermic reactions absorb heat from the surroundings, while exothermic reactions release heat.
Compare and contrast periods and groups.
Periods are horizontal rows on the periodic table, while groups (or families) are vertical columns. Elements in the same group have similar chemical properties.
What is viscosity?
Viscosity is a measure of a fluid's resistance to flow; honey is an example of a substance with high viscosity.
What mission first took humans to the moon?
Apollo
What are the 6 phase changes?
The 6 phase changes are melting, freezing, condensation, vaporization, sublimation, and deposition.
What is the scientific law?
A scientific law is a statement based on repeated experimental observations that describes some aspects of the universe.
What is a combustion reaction?
A combustion reaction is a chemical reaction that involves the burning of a substance in the presence of oxygen, producing heat and light (e.g., CxHy+O2→CO2+H2O)
What is average atomic mass?
Average atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).
What are some of the properties of an acid?
The properties of an acid include tasting sour, reacting with metals, turning blue litmus paper red, and reacting with bases to form salts and water.
Put these events in chronological order: the cellphone is invented, Twitter goes online, the Great Pyramids of Giza are built, the Declaration of Independence is signed, the first railroad is built across America
Pyramids (2500 BCE)
Declaration (1776 CE)
Railroad (1869 CE)
Cellphone (1973 CE)
Twitter (2006 CE)