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Fact Crossword Puzzle 24 (Facts 1-280)

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Across
1.the new substances formed in a chemical reaction are called __________ (Fact 269)
3._______ is the study of the physical structure of Earth, its history, and the forces that shape it (Fact 79)
5.A/an ________ is a pure substance (made of identical particles) made of two or more elements chemically combined (Fact 262)
8.there are seven __________ (rows) and 18 columns or groups of elements on the Periodic Table (Fact 259)
10.__________ are organic compounds that make up parts of cell membranes and other organelles (Fact 279)
13.______________ are organic compounds made by living things (Fact 275)
14._________ is the hereditary material in humans and in almost all other organisms (Fact 171)
15.compounds can be broken down into the elements that for them through _______ ___________ (Fact 264)
18.______________ or life science is the study of living things (Fact 154)
19.elements can be classified into three categories, metals, __________, or metalloids (semi-metals) (Fact 255)
22._________ is the study of the properties and interactions of matter (Fact 219)
23.a _______ ________ is a force of attraction that holds two or more atoms together due to the rearrangement of electrons between them (Fact 266)
24.___________ is the study of matter, energy, motion, and forces (Fact 219)
25.the law of __________ of mass (matter) states that mass is not created or destroyed during ordinary physical or chemical changes (Fact 270)
Down
2.human beings have _____ ______ pairs of chromosomes (Fact 183)
4.all chemical reactions involve thermal energy being absorbed (___________) or released (exothermic) (Fact 271)
5.almost all organic compounds contain the element ________ (Fact 272)
6.the main organ of the excretory system is the ________; it functions to eliminate wastes from the bloodstream and the body (Fact197)
7.carbon is the backbone of organic compounds because it can form four _____ _______ with itself and with atoms of other elements (Fact 273)
9.living things are made of the elements carbon, hydrogen, nitrogen, phosphorus, and _______ (Fact 274)
11.the starting substances in a chemical reaction are called __________ (Fact 268)
12.___________ is the study of Earth's atmosphere (Fact 81)
16.____________ are organic compounds used by organisms as an energy source and energy storage (Fact 277)
17.proteins re made of smaller particles called ______ ______ (Fact 280)
20.A/an ___________ is a pure substance (made of identical particles) tht cannot be broken down into simpler substances by physical or chemical means (Fact 253)
21.the two types of carbohydrates are __________and and sugars (Fact 278)

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