Chemistry
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What type of equation is this; NaCl+AgNO3-MgCl2+H2
Double
What type of equation is this; Cl2+NaBr-NaCl+Br2
single replacement
What type of equation is this; H+N-HN
Synthesis
What is a chemical change?
a change on which a reaction between the atoms or molecules must take place
Heat causes an object to __________
expand
SKIP List the labels of the periodic table, left to right.
alkali metals alkaline earth metals transition boron family carbon nitrogen oxygen halogens noble gasses lanthanoid actinoid
What type of equation is this; HgO-Hg+O
decomposition
define exothermic
exothermic is a type of evidence, in the category heat given off or removed, and is characterized by heat being given off.
define endothermic
endothermic is a type of evidence, in the category heat given off or removed, and is characterized by heat being removed
list the different types of evidence for chemical reactions
• heat given off or removed • precipitate • color change • gas production • new substance with different properties
are the following chemical or physical changes: • zinc is added to vinegar • wooden splint is broken in half • benedicts solution is added to corn syrup and heated • seltzer tablet is crushed • crushed seltzer is added to water • hydrochloric acid, baking soda, and phenolphthalein are mixed • new substance appears • digesting a candy bar • dissolving cool-aid in water • dew on grass in the morning • chemical reaction occurs and something bubbles • substance changes state or phase
• chemical • physical • chemical • physical • chemical • chemical • chemical • chemical • physical • physical • chemical • physical
is the carbon cycle a chemical or physical change?
chemical, (photosynthesis and respiration are chemical changes because CO^2 is broken down to make sugar during photosynthesis and during respiration it is released)
define chemical change?
the product is noticeable/visually modified product no new substance is formed
define physical change?
a new substance is formed and can not be reversed
define the law of conservation of matter
no matter how many reactants and products in a chemical reaction, all of atoms present at beginning of the reaction will remain at the end, meaning the total mass stays the same. matter is neither created nor destroyed.
give definition, properties, and examples about mixtures
definition: two or more substances that are together in the same place but not chemically combined. properties: each substance keeps individual properties examples: soil, ocean water, drink mix,
define homogenous
well mixed, can’t see different parts. often called a solution - a solution is the best mixed of all possible mixtures examples: pure and salt water, iron, hydrogen
define heterogenous
can see separate parts, not completely mixed. examples: salad, trail mix, a pencil
compound or mixture: • air • powdered drink mix • paper • sugar • carbon dioxide • calcium carbonate
• mixture • mixture • mixture • compound • compound • compound
you can separate mixtures by using…
magnetism, hand seperation, filtration, sifting, extraction and evaporation, chromatography
what does the indicator of red litmus do?
red litmus and basic substances turn the paper blue
what does the indicator of blue litmus do?
blue litmus and acidic substances turn paper red
what does the indicator of bromthymol do?
acid: orange neutral: blue base: dark blue
what does the indicator of phenolphthalein do?
acid: nothing neutral: pink base: dark pink