Science

• Nitrogen makes up about 78% of the air we breathe.
• The yellow flame is also known as the safety flame
• The blue flame is also known as the roaring blue flame.
• a solution is formed when we mix a solid with a liquid.
• The more dense something is, the heavier it is.
• The less dense something is, the lighter it is.
• A dependant variable is a factor that is measured
• An Independent variable is the factor that is being changed or manipulated.
• A controlled variable is a factor that remains the same throughout the experiment.
• When writing a method, never use pronouns
• The hypothesis is the prediction of the experiment and is tested by the researcher.
• use a pencil when drawing a diagram
• Elements are a pure substance
• Elements can't be broken down into simpler substances.
• Compounds are made of two elements that are chemically bonded together.
• Mixtures are a mix of substances
• Mixtures can usually be separated
• The periodic table was invented by Dmitri Mendeleev.
• The periodic table is a system that arranges all chemical elements in order of their increasing atomic number
• Separation techniques are ways to seperate mixtures
• A structure of an atom is called atomic structure
• Chemical bonding is an attraction between atoms that form a chemical
• When drawing a graph, the independent variable goes on the x axis and the dependant variable goes on the y axis
• diffuse means to spread out
• extrapolation is the predicting of data from certain trends or patterns
• interpolation is the process of determine unknown values in between known data points
• A homogeneous mixture have evenly distributed particles that are all the same composition
• A heterogeneous mix have randomly distributed particles and a varying composition