Flashcards in Semester Deck (25)
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CFC
False
1
The mass
True
2
It is advisable
False
3
Earth attracts
False
4
Crystallization
True
5
Orange juice
True
6
The periodic table
False
7
Milk
False
8
Mendeleev's
True
9
Greek philosophers
True
10
In the notation
False
11
A proton
True
12
Seawater
False
13
Which of the following about chlorofluorocarbons is true?
It is made by humans
14
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
15
The graph represents the sales data for a particular product. In which week were 8 units sold?
4th week
16
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
17
Matter that has a uniform and unchanging composition is known as an
Substance
18
The law of conservation of mass states that drying a chemical reaction, total mass is
The same
19
Which technique used a porous barrier to separate a solid from a liquid?
Filtration
20
Which of he following substances is an element?
Iron
21
A chemical composition of two or more different elements joined together in fixed proportions is known as an
Compound
22
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
23
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%
24
