Metric vs Imperial System
the two main ways to measure things people use worldwide
What is The metric system and the imperial system.
an independent variable in an experiment.
An independent variable is what you change in an experiment to see how it affects something else. For example, if you want to see how different amounts of sunlight affect plant growth, the amount of sunlight is the independent variable.
The three main states of matter
what is gas, liquid, solid
an element's atomic number means
What is the number of protons in the nucleus of an atom
A chemical reaction?
What is: A chemical reaction is a process where substances (reactants) are transformed into different substances (products) with new chemical properties?
the countries still using the imperial system for measurements
What is the United States, Liberia, and Myanmar..
a dependent variable
What is a dependent variable is what you measure in an experiment. It changes based on the independent variable. In the plant growth example, the growth of the plants is the dependent variable because it changes when you change the sunlight?
What distinguishes the volume and shape of a liquid from that of a solid?
What is: A liquid has a fixed volume but takes the shape of its container, while a solid has a fixed shape and volume.
the mass of an atom tells us
What is the total number of protons and neutrons in the atom
Reactants and products?
What is: Reactants are starting substances in a chemical reaction; products are the new substances formed as a result of the reaction?
one meter in yards
What is approximately 1.09 yards.
an example of a control in a science experiment
What is: A control group is a special part of an experiment that helps you compare results. It doesn’t get the treatment being tested. For example, if you’re testing a new fertilizer, the control group would get no fertilizer. This helps to see if the fertilizer makes a difference?
When a solid transforms straight into a gas, what phase change takes place?
What is sublimation?
the periodic table's rows (periods) represent
What is the amount of electron shells in an atom?
In the reaction 2H2 + O2 → 2H2O, how many molecules of water are produced?
2 water molecules
the most common imperial unit used for measuring land area
What is acre
the purpose of constants in an experiment
What is: Constants in an experiment are factors that remain the same throughout. This is important because it ensures that the test is fair. For example, if you’re testing how sunlight affects plant growth, you would keep the type of plant, soil, and water amount the same so that only sunlight is affecting the growth?
What distinguishes chemical changes from physical changes?
Chemical changes happen when a substance turns into something new, like burning wood turning into ash. Physical changes are when a substance changes form but stays the same, like ice melting into water.
Describe the similarities in chemical characteristics among elements in the same group.
What is: They have the same number of valence electrons, so they react similarly in chemical reactions?
The law of conservation of mass in the context of balancing chemical equations is.
What is: The law states that mass is neither created nor destroyed in a chemical reaction, so the number of atoms of each element must be the same on both sides of the equation.
United States keep using the imperial system instead of switching completely to the metric system because.
What is It's simpler to convert (based on 10s), and it's used almost universally.
In a study testing the effect of light on plant growth, identify the independent and dependent variables.
What is: In a study looking at how light affects plant growth, the independent variable is the amount of light and the dependent variable is the growth of the plants. You change the light levels to see how it influences how well the plants grow?
Why does the temperature stay constant throughout a phase change?
The temperature stays constant during a phase change because all the energy goes into changing the state rather than raising the temperature. This means that while the substance changes, it doesn't get hotter or colder until the change is complete.
The meaning of the periodic table's "chemical families" or groups.
What is: columns of elements with similar chemical properties and the same number of valence electrons?
Balance this equation: C2H6 + O2 → CO2 + H2O.
Balanced: 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O