Data
Record your data either in your lab notebook or in the space below.
Step
Material...
Data
Record your data either in your lab notebook or in the space below.
Step
Material
Change(s) Observed
Type of Change (Physical/Chemical)
Reasoning
2
Calcium carbonate
Particle size changed (it was pulverized and became a powder)
Physical Change
It did not change its identity, only the particle size.
3
Calcium carbonate and hydrochloric acid
Color changed; created a gas; bubbles
Chemical
Indicated by the production of bubbles the calcium carbonate was transformed into a different substance
4
Water
Bubbles; gas
Physical
It underwent a phase change but it retained its original properties
5
Copper sulfate pentahydrate
Gas; color change
Chemical
Gas is given off and color changed – these are indicators of a color change
6
Iron filings and sulfur
Color Change; iron is removed
Physical
The color change occurred but each solid kept its original properties.
7
Lead nitrate and potassium iodide
Color change; created a solid substance
Chemical
When the color change and solid formation occurred, its strong evidence that the two made a new substance
8
Magnesium and hydrochloric acid
Bubbling; increased temp by 33 degrees; strip dissolved
Chemical
The temp changes; the magnesium disappears, and a gas is produced, this indicates a chemical change
9
Candle
Wax melts (drips); wick is burned ‘disappears’; light is produced
Chemical and physical
The wax changes shape (physical change); heat and light is produced (chemical change)
can you analysis and write a conclusion for it?
Answers: 3
Chemistry, 22.06.2019 00:40
1) in saturated limewater, [h+ ]=3.98x10-13 m. a) find [oh]-/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 2) in butter, [h+ ]=6.0x10-7 m. a) find [oh]-/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 3) in peaches, [oh]=3.16x10-11 m a) find [h+ ]/ b) what is the ph? / c) is the solution acidic, basic, or neutral? / 4) during the course of the day, human saliva varies between being acidic and basic. if [oh]=3.16x10-8 m, a) find [h+ ]/ b) what is the ph? / c) is the solution acidic, basic, or neutral? /
Answers: 3
Chemistry, 22.06.2019 09:30
1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle
Answers: 1
Chemistry, 23.06.2019 07:00
Achemist who studies water samples did a demonstration of how to test for lead in water. she added a clear solution of potassium iodide to a clear solution of lead nitrate. then a yellow swirling solid formed in the liquid. what is most likely true about the yellow solid?
Answers: 3
Chemistry, 23.06.2019 08:30
Sand is more likely than shale to preserve fossils. true false
Answers: 2
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