Mixture
What is the mixture?
a blend of two or more components.
Substance can be classified as _________ or ________.
element / compound
Give two examples of physical properties.
Hardness/conductivity/texture/boiling point......
Element.
What are included in a chemical reaction or chemical equation?
reactants and products
Which one is a mixture?
Copper Coffee Oil
coffee
Give examples of element and compound.
Answer can very.
H/water
Give two examples of chemical properties.
Flammability/ toxicity/ rusty ...
In the periodic table, what is called of the horizontal line? What is called for the vertical line?
period/ group.
After chemical reaction, there must be new substance produced. (True/ False)
True.
Give an example of heterogeneous mixture.
bubble tea/ 麻辣香锅/answer will vary.
a. Table salt (NaCl)
b. salt water
c. sodium (Na)
a. compound
b. mixture
c. element
Give two examples of physical changes. ( One is reversible, another is irreversible.)
Melt/ cut
Answer can vary.
(which period, which group.)
Third period, 15 group or 5A group.
a. Oil water—Oil + Water.
b. Water—Hydrogen + Oxygen
b.
Because there are new substance produced.
Classify each of the following as a homogeneous mixture.
granite rock/green ink/chocolate-chip ice cream/salt water
green ink and salt water
Write the chemical symbol for each of the following elements.
Sodium
silver
Aluminum
Na
Ag
Al
Give two examples of chemical changes.
Burn/rust/form precipitate...
Answer can vary
All the elements in the same group gave similar chemical and physical properties. (False/True)
True.
In a chemical reaction, how does the mass of the reactants compare with the mass of the products?
What's the goal of distillation?
The goal is to separate the components of a solution. The solution is boiled to produce a vapor, which is condensed to liquid. Dissolved solids are left behind.
(Close answer is also correct.)
How to distinguish the compound and mixture?
Compounds have definite composition.
Mixtures have variable composition.
How to distinguish the chemical change and physical change?
Weather if have new substance be produced or not.
Name two elements that have properties similar to those of the element calcium (Ca).
Be/Mg/Sr/Ba..
Hydrogen and oxygen react chemically to form water. How much water would form if 4.8g of hydrogen reacted with 38.4g of oxygen?
43.2g