Semester Flashcards
(25 cards)
The mass
True
CFC
False
It is advisable
False
Earth attracts
False
Crystallization
True
Orange juice
True
The periodic table
False
Milk
False
Mendeleev’s
True
Greek philosophers
True
In the notation
False
A proton
True
Seawater
False
Which of the following about chlorofluorocarbons is true?
It is made by humans
A bottle contains 3.100 mL of a liquid. The total mass of the bottle and the liquid together is 6.300g. The mass of the empty bottle is 4.240g. What is the density of the liquid?
0.665 g/mL
The graph represents the sales data for a particular product. In which week were 8 units sold?
4th week
The product of 2 x 10^4 cm and 4 x 10^-12 cm can be expressed in scientific notation as
8 x 10^-8
Matter that has a uniform and unchanging composition is known as an
Substance
The law of conservation of mass states that drying a chemical reaction, total mass is
The same
Which technique used a porous barrier to separate a solid from a liquid?
Filtration
Which of he following substances is an element?
Iron
A chemical composition of two or more different elements joined together in fixed proportions is known as an
Compound
An 8.00-g sample of aluminum reacts with oxygen to form 15.20 g of aluminum oxide. How many grams of oxygen are used in the reaction?
7.20
A 76.00-g sample of an unknown compound contains 12.90 g of sulfur. What is the percentage by mass of sulphur in the compound?
16.97%
