Semester Flashcards

(25 cards)

0
Q

The mass

A

True

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1
Q

CFC

A

False

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2
Q

It is advisable

A

False

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3
Q

Earth attracts

A

False

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4
Q

Crystallization

A

True

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5
Q

Orange juice

A

True

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6
Q

The periodic table

A

False

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7
Q

Milk

A

False

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8
Q

Mendeleev’s

A

True

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9
Q

Greek philosophers

A

True

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10
Q

In the notation

A

False

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11
Q

A proton

A

True

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12
Q

Seawater

A

False

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13
Q

Which of the following about chlorofluorocarbons is true?

A

It is made by humans

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14
Q

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?

A

0.665 g/mL

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15
Q

The graph represents the sales data for a particular product. In which week were 8 units sold?

16
Q

The product of 2 x 10^4 cm and 4 x 10^-12 cm can be expressed in scientific notation as

17
Q

Matter that has a uniform and unchanging composition is known as an

18
Q

The law of conservation of mass states that drying a chemical reaction, total mass is

19
Q

Which technique used a porous barrier to separate a solid from a liquid?

20
Q

Which of he following substances is an element?

21
Q

A chemical composition of two or more different elements joined together in fixed proportions is known as an

22
Q

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?

23
Q

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?

24
An industrially important element contains 26 electrons and rusts in the presence of air and moisture. Identify the element
Iron