Lesson 3 & 4
Which of the following is a way in which elements and compounds are similar?
Elements and compounds are both pure substances.
Which of the following is a way in which elements and compounds are different?
Elements are made of identical atoms, whereas compounds are made of identical molecules.
(true or false) A proton is a negatively-charged subatomic particle.
False
In the image above, substance A and substance B combine to form substance C.
a compound
Which of the following describes an element?
a substance that cannot be broken down into simpler materials
What is an element?
A substance that cannot be broken down into simpler materials by ordinary
Every atom has a nucleus and an electron cloud. The diagram above is a model of an atom. Which label points to a neutron?
B
The diagram above shows a portion of the periodic table. Which of the following elements have similar physical and chemical properties?
Li, Na, K
David found that water can be created in a lab by burning hydrogen gas in air. He concluded that water is not a compound because only hydrogen was used to form the water. What is wrong with David's conclusion?
The hydrogen combined with oxygen from the air to form water.
Above is a picture of a magnet near a pile of particles of iron and sulfur. The magnet attracts the iron, separating it from the mixture. Which statement is true?
The parts of a mixture keep their own properties.
Sucrose is another name for table sugar. Sucrose is a compound made from the elements carbon, hydrogen, and oxygen. Which statement best describes the properties of sucrose?
They are different from the properties of the elements in sucrose
How is the element carbon different from the element nitrogen according to the image above?
They have different numbers of protons.
(true or false) Each element is a pure substance that cannot be broken down into simpler materials by ordinary means and is represented by a unique chemical symbol.
True
What do protons and electrons have that neutrons do not?
charge
What type of substance is always made up of two or more different types of elements joined by chemical bonds?
compound
Which atom particle has the smallest mass?
electron
Which atom particle is outside the nucleus?
electron
What type of substance is always made up of a single type of atom?
element
Metals all share certain physical properties. Which property do most metals share?
malleable
Which of these common substances is a homogeneous mixture?
maple syrup
What electric charge does an electron have?
negative
What electric charge does a neutron have?
neutral
Atoms are made up of smaller particles. Identify the three particles within an atom: proton, electron, and __________.
neutron
What electric charge does a proton have?
positive
Which two atom particles have about the same mass?
proton, neutron
Which atom particles are inside the nucleus?
protons, neutrons
which physical properties are associated with most metals?
shiny, good conductors, malleable
Which of these substances is a compound?
water
