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Flashcards in Semester Deck (25)
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0

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

An industrially important element contains 26 electrons and rusts in the presence of air and moisture. Identify the element

Iron