Science 1
Atoms are the _____ particles of an element.
smallest
A _____ is when different elements join together to make a new substance.
compound
An element has only one type of atom. True / False
True
Which of these substances is a mixture? (Gold, Dirt, Oxygen, or Helium)
Dirt
Name a substance that does not dissolve in water?
Oil, Flour, Dirt, chocolate, coffee, tea
A ______ has a positive charge and is inside the nucleus of an atom.
proton
A ______ has no charge and is inside the nucleus of an atom.
neutron
An electron has a ______ charge and circles very fast outside the nucleus.
negative
Which element has the symbol C?
Carbon
Cu is the symbol for what element?
copper
What happens to sugar when you mix it in a glass of water?
It dissolves
A mixture is a substance where you mix the same element together. True / False
False
A sieve is good for removing which of the following:
a) sugar from water
b) baking soda from water
c) rocks from sugar
c) rocks from sugar
What is the element that has the symbol Au?
Gold
What is the symbol for the element Sulphur?
S
Describe the process to separate substances using distillation.
Distillation involves heating a substance in water so that the water evaporates. As the water evaporates it is collected and cooled. Then the water goes to another container and is collected. This water is pure.
Describe how to use a sieve.
You can place small and large particles in the sieve. When you gently shake the sieve, the small particles will go through while the large particles will stay in the sieve.
What is the difference between an element and a compound?
An element has only one type of atom. A compound is when two or more elements chemically join together to make a new substance.
Give an example of two different kinds of mixtures.
Salad, trail mix, cereal, dirt, air
Describe the filtration process.
Filtration uses a thin paper where you can pour a mixture into it. The water will pass through because the paper has small holes while the solid substance like coffee will not pass through.
Describe evaporation.
Evaporation is when you heat a substance in water and the water turns into a gas. The remaining substance is left in the container while the water evaporates into the air.
Describe the Bohr model.
This is when electrons gain energy and jump to an outside ring circling the nucleus. As the electrons get more energy they move farther away. When they get too much energy, they fall back to the nucleus and lose energy. When this happens they give off light
If I pour flour into water and stir in a cup, what do we call the resulting mixture? Is is a solution or suspension?
Suspension
If I pour baking soda into water and stir in a cup, what do we call the resulting mixture? Is is a solution or suspension?
solution
If I pour coffee into water and stir in a cup, what do we call the resulting mixture? Is is a solution or suspension?
Suspension