Science skils
What should you do first if glass breaks during a lab?
Tell the teacher.
What is matter?
Anything that has mass and takes up space.
What is the center of an atom called?
The nucleus
What does an element's atomic number tell you?
Number of protons
What is an ion?
An atom or group of atoms with an electric charge
What do we call a testable prediction about what will happen in an experiment?
A hypothesis
Which state of matter has a definite shape and definite volume?
Solid
Which particle has a positive charge?
A proton
What do we call a vertical column on the periodic table?
A group or family
If neutral atom loses an electron, does it become positive or negative?
Positive. It loses a negative charge.
You change a paper airplane's wing shape and measure its flight distance. What is the independent variable
Wing shape (the thing/factor you changed)
Ice melts into liquid water. Is this a physical or chemical change?
A physical change. Its still water.
Which TWO types of particles are in the nucleus?
Protons and neutrons
A sample is shiny, bends easily, and conducts electricity well. Is it most likely a meta, nonmetal, or metalloid?
A metal
What happens to electrons in a covalent bond?
Atoms share electrons
In the airplane experiment, what is the dependent variable?
Flight distance; The result measured
Name two physical properties you could use to describe an unknown object.
Color, mass, volume, texture, hardness, or conductivity
A neutral atom has 8 protons. How many electrons does it have? Explain
8 electrons. A neutral atom has equal numbers of protons and electrons.
What makes a metalloid different from a typical metal or nonmetal?
It has some properties of metal and some properties of nonmetals.
An atom has 11 protons and 10 electrons. What is its charge? Explain.
+1. Has one more proton than electron
In a CER, which part gives observations or measurements, and which part explains how the science supports the claim?
Evidence gives observations or measurements. Reasoning explains the science connections.
A student says cutting paper creates a new substance, Explain why the student is incorrect.
Cutting changes the paper's size or shape. It remains paper, so this is a physical change
An atom has an electron arrangement of 2, 8, 1. How many total electrons and valence electrons does it have?
11 total electrons and 1 valence electron
Magnesium's atomic number is 12. Its neutral electron arrangement is 2, 8, 2. Give its number of protons. total electrons. and valence electrons.
12 protons, 12 total electrons, and 2 valence electrons
Sodium transfers an electron to chlorine. What bond forms, and why do the resulting ions attract?
An ionic bond. Sodium becomes positive and chlorine becomes negative. Opposite charges attract.