Number of results: 27,358
chemitry--- physical & chemical change---
describe a physical change that appears to change chemically???
Tuesday, September 25, 2012 at 11:25pm by Maria
Physical Science
A chemical change is a change in which something new is formed Physical change is a change in which the substance changes form but keeps its same chemical composition In ice, each of the molecules is connected to the molecules next to it, making it hard. Freezing is a change ...
Thursday, April 19, 2012 at 7:22pm by Rezu
Chem Lab
Am I right? Classify the following properties of sodium metal as physical or chemical: •Silver metallic color—physical property •Turns gray in air—physical property •Melts at 98º C-melting point is physical property •Reacts explosively with ...
Friday, April 23, 2010 at 5:59pm by Help1001
science
A physical change is the wax melting and a chemical change is when it lets out heat and light energy - I think.... The difference between a physical and a chemical change is that you can see the physical changes but but you can't really see the chemical changes. The ...
Saturday, October 21, 2006 at 10:00am by duckwithnoname
chemistry
Those involving a chemical change are chemical; a physical change is physical. For example, it is a gas; that is a physical property.
Tuesday, February 19, 2008 at 7:35pm by DrBob222
Physical Science
Can you change it back to what you started with just by physical means? If so it is a physical change/property. If you need chemical means then it was a chemical change.
Tuesday, September 9, 2008 at 3:16am by Dr Russ
science
Will you please check a few more? Physical change, chemical change or both kinds of change? 1. Sodium hydroxide dissolves in water (both) 2. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water and heat (chemical) 3. A pellet of sodium is sliced in two (...
Wednesday, September 12, 2012 at 9:58pm by Reed
Chemistry
Are the following physical or chemical: a. dew is dried by the sun a dark cloth is faded by the sunlight c. grape juice is converted to wine d. soap is dissolved in water a.physical b.physical c.chemical d.chemical Physical changes are those in which the substance is not ...
Saturday, September 9, 2006 at 9:53pm by Joe
chemistry
Water vapor cooling is a physical change, not a chemical change. Does combusting gas to CO2 and H2O count as a chemical change although it isn't part of the paper clip. Did the paper clip change color upon heating? Isn't that a chemical change? What do you think the ...
Monday, October 26, 2009 at 8:05pm by DrBob222
Science =____= ASAP!!!
It is difficult to apply 'physical' or 'chemical' change descriptions to biological systems. Of the two choices I would agree with Ms. Sue in that a chemical change is the better description. I am not sure the pH you are starting from. The drop in pH may ...
Wednesday, November 24, 2010 at 8:19pm by Dr Russ
science
what is a chemical and physical change? http://www.onelook.com/ Type in chemical change, then physical change.
Sunday, November 19, 2006 at 7:47am by physical change
science
a physical change-the wax starts to melt A chemical change - light and heat energy is produced the difference between chemical and physical changes are that you can measure and seephysical changes wheres you cant or a chemical change. for the reachts its hydrogen+oxygen equals...
Friday, October 20, 2006 at 2:34pm by not going to say it
CHEM
is breaking an egg a chemical or physical change? is cooking an egg a chemical or physical change?
Sunday, October 17, 2010 at 8:39pm by Elizabeth
CHM
I would agree that burnt toast is an example of a chemical change. I suppose if one wanted to get picky, "leaving" the toast somewhere is a physical change but burning it is a chemical change.
Sunday, January 27, 2013 at 11:24pm by DrBob222
9th grade
how can a egg be a chemical change? How can an antacid tablet be a physical and a chemical change?
Thursday, September 23, 2010 at 4:50pm by Nichole
Chemistry
Is the following a physical or chemical separations: salt water --> water+ sodium chloride Do you change the composition of the water? Do you change the composition of the salt. I can't say which because you don't tell me how you separated them. For example, if ...
Saturday, September 9, 2006 at 10:38pm by George
science
The staement is correct. A new chemical compound is formed in a chemical reaction, and all chemical and physical properties change
Saturday, October 6, 2007 at 11:19pm by drwls
science
Is melting ice a physical or chemical change? I think it is a physical change. Am I correct?
Thursday, December 8, 2011 at 1:08pm by Bob
science
Is distillation a chemical or physical change? My answer is a physical change. Is this Correct? My Mom wrote to ask you guys to check her checking my answers. Who is right?
Monday, September 17, 2012 at 11:11pm by Reed
year 7 science
Just remember that with a PHYSICAL change the chemical make up of the item remains the same; it changes it's looks but is the same chemically. When CHEMICAL changes occur, then the make up changes as well. For example when ice melts, the ice is now water but the chemical ...
Tuesday, April 29, 2008 at 9:05am by Anonymous
science
Will you please check? Physical or chemical properties 1. bitter taste = physical taste 2. can neutralize a base= physical property 3. boiling point = physical property 4. reacts with a base to form water= physical 5. reacts with acid to form hydrogen = chemical property 6. ...
Wednesday, September 12, 2012 at 9:51pm by Reed
chemistry
Physical changes are those that do not involve a change in chemical composition. Some examples are changing the shape of an object, the size of an object, changing its color, its volume, its mass, freezing or boiling water, changing water from liquid to gas, etc. Chemical ...
Wednesday, January 19, 2011 at 11:39am by DrBob222
Changes in Matter
Which of the following kitchen activities are physical changes, and which are chemical changes? a)cooking bacon-chemical b)making icing-physical c)baking a cake-chemical d)using oven cleaner-chemical e)making whipped cream-physical Please correct me if I'm wrong, thanks
Monday, March 22, 2010 at 7:16pm by Sara
Changes in Matter
Which of the following are examples of a physical change? a)change in physical state b)change in size or shape c)change in properties d)change in texture e)change in physical quantities f)change in substances Answer: a, b, and d Please correct me if I'm wrong, thanks
Monday, March 22, 2010 at 7:28pm by Sara
chem.
Sodium metal is insoluble in ether - No change but technically you can call the sodium in ether an insoluble mixture and therefore a physical change. Sodium metal dissolves in water to produce a gas - You get a chemical change happening here because the sodium reacts with the ...
Wednesday, February 16, 2011 at 5:45pm by Qpee
science
1. The ability of an apple to change color when exposed to air is a ____. (1 point)physical property chemical property physical change chemical change 2. Which of the following is NOT a possible sign of a physical change? (1 point)a change in appearance a change in volume the ...
Tuesday, April 17, 2012 at 1:33pm by NIKE
chemistry
Classify the following properties of ozones as physical or chemical: 1.bluish color 2.pungent odor 3.reactive towards oxygen 4.decomposes to oxygen on exposure to ultraviolet light 5.it is a gas Is this correct? 1.chemical 2.physical 3.chemical 4.chemical 5.phsical
Wednesday, February 20, 2008 at 6:36pm by lizzie
Chemistry
The ripening of a banana in which the skin turns yellow and it tastes sweet is an example of what change??? physical or chemical????? Chemical.
Thursday, April 19, 2007 at 8:40pm by Anonymous
Chemistry
One example of chemical change is lighting a gas stove to cook material. That is the oxidation of methane. CH4 + 2O2 ==> CO2 + 2H2O Cooking is another example of chemical change; for example, baking bread. One example of a physical change is one suggested by Cathrine.
Thursday, June 5, 2008 at 11:55pm by DrBob222
science
You might begin here: http://search.yahoo.com/search?fr=mcafee&p=example+of+a+physical+change+%26+a+chemical+change+for+iron Sra
Wednesday, April 21, 2010 at 11:18pm by SraJMcGin
Changes in Matter
Which of the following geological changes are physical changes and which are chemical changes? a)formation of a limestone cave b)creation of a canyon by a river c)wearing of rocks by wave action d)destruction of lakes by acid rain e)heaving of the ground by ice formation a = ...
Monday, March 22, 2010 at 7:26pm by Sara
Chemistry + possible answers
for question 2c earlier - Would you describe the effect of heat on the white powders as a physical change or a chemical change? give one reason for your answer. - My sister told me the answer would be for whichever one is more difficult to reverse but I don't know which ...
Thursday, September 11, 2008 at 2:46pm by Moira
Honors Chemistry
We did the gold penny lab, where we bathed a copper penny in a hot zinc-NaOH mixture to turn it a silver color, then we heated that in a flame to turn it a gold color. There are two questions that go with this lab that I don't understand, however: 4. Did the copper and ...
Wednesday, October 7, 2009 at 12:01am by Emily
science
im doing exactly the same thing. Chechimal change : Chemical Change: Light and Heat is produced. It will make the atoms move around with the energy. The Hydrocarbon vapours burn to give a Combustion reaction with Oxygen of the air which converts the vapour into CO2, CO, C (...
Saturday, October 21, 2006 at 10:00am by Me bruv
Physical Science
The conversion of water to ice is considered a physical change, whereas the conversion of iron to rust is considered a chemical change. Why?
Thursday, April 19, 2012 at 7:22pm by Jess
Chemistry
Frankly, these are difficult. IF we just look at the number of protons, number of neutrons, number of electrons as just numbers and not what they might or might not do in a reaction, then I would go with physical properties for them. Of course atomic number is a physical ...
Saturday, November 29, 2008 at 9:12pm by DrBob222
science
Give an example of a physical change and a chemical change for iron
Wednesday, April 21, 2010 at 11:18pm by rhon
science
how can you tell the easiest way if something is a chemical change or physical change.
Monday, September 20, 2010 at 4:41pm by layth
Science
Is wood cut in boards is it a physical change or chemical change, explain
Monday, September 22, 2008 at 6:38pm by Taylor
science
We're all doing the same hw! lmao. Okay guys, I'm gunna help :) The chemical change is the wax, as it heats the flame vaporises and this vapour travels up the wick. The phsical change is the wick, when flame is applied to wick this wax is melted and vaporised... -A ...
Friday, October 20, 2006 at 2:34pm by Lucy
Chemistry
Would you expect a chemical change to be always accompanied by a physical change? Explain?
Wednesday, October 3, 2012 at 4:22pm by shay
chemistry
If the products are different from the reactants you have a chemical change; otherwise it's a physical change.
Sunday, July 3, 2011 at 1:31pm by DrBob222
chemistry
can you correct me if I am wronge 1.chemical 2.physical 3.chemical 4.chemical 5.physical
Tuesday, February 19, 2008 at 7:35pm by lizzie
chemistry
Would you expect a chemical change to be always accompanied by a physical change?Pls. Explain
Friday, October 5, 2012 at 4:42pm by Amanda
science
WHAT IS A PHYSICAL CHANGE AND A CHEMICAL CHANGE?? BY THE WAY IM DOING THE SAME PROJECT!! HELP MEE!!!
Saturday, October 21, 2006 at 10:00am by i hate this HOMEWORK!
science
WHAT IS A PHYSICAL CHANGE AND A CHEMICAL CHANGE?? BY THE WAY IM DOING THE SAME PROJECT!! HELP MEE!!!
Saturday, October 21, 2006 at 10:00am by i hate this HOMEWORK!
math
What vocabulary term causes iron to rust (Evaporation, condensation, chemical change or physical change)?
Tuesday, January 22, 2013 at 7:37pm by Anonymous
College Chemistry
Changing the SIZE of a plant is a physical change but the process that produces energy for this is a chemical change.
Friday, September 10, 2010 at 8:00pm by DrBob222
science
1. Something must have reacted with the glowing splint to make the pop; therefore, that must be a chemical change. 2. This probably is a physical change. Probably there is no reaction. (I say probably because a change in color does, at times, denote a chemical change. For ...
Saturday, October 6, 2007 at 11:28pm by DrBob222
Science
When you boil an egg, the egg "white" changes from clear to white. The egg also becomes "hard boiled." What type of changes are occurring in the egg? A.Chemical B.Neither physical nor chemical C.Physical D.Physical and Chemical
Tuesday, February 5, 2008 at 6:09pm by jika
gen chem
How do you change U-238 to Pb-206 without a chemical change occurring. And some physical changes, too.
Sunday, August 8, 2010 at 7:53am by DrBob222
science
What kind of change does a cake that is cooking undergo as it bakes? I would think it was a chemical and physical change. Am I correct?
Sunday, October 4, 2009 at 5:26pm by John
science
what are the characteristics of a chemical change? New substances are formed. This is often accompanied by heat, light, change in appearance (though physical changes also can change in appearance)or color.
Monday, September 25, 2006 at 7:36pm by diego
7th Grade Science
what physical force can cause a change in the state of matter what is the difference between chemical and physical changes what occurs during Bose-Einstein condensation Please help me.
Tuesday, September 4, 2012 at 10:00pm by completeidiot
Chemistry
I'm thinking maybe the sparked it made would be a chemical change when it was being burned. Is that another a example of a chemical change? I need one more chemical change. So far I got: 1. Changed from Mg to MgO 2. Made spark when burning 3.
Thursday, January 29, 2009 at 4:45pm by Chopsticks
science
What happens when a candle is alight (on one side we had to show physical change and on other side the chemical change). The question sheet says 'Explained both changes using the Big Idea of Energy.' The physical changes are what you can see, and what you can measure. ...
Saturday, October 21, 2006 at 10:00am by liverpool
science
im stuck im 11 i have a twin she is more cleaver she told me that Their is a phisical change the phisical change is the wax starts to melt.The chemical change is the light and heat energy is produced .thier is a diffeence beetween a phisical and a chemical the difference is ...
Friday, October 20, 2006 at 2:34pm by Tia
geology
Apart from the composition of the rock itself, what climate do you imagine is more conducive to physical weathering? and Chemical weathering? I know physical weathering is from wind and water transporting the eroded rocks and particles. Chemical weathering is water ...
Wednesday, December 15, 2010 at 2:02pm by m
chem
The question you must answer is, does the change form a new chemical compound or is it the same material after the change as before the change? For example, 1. The sodium is oxidized to Na2O because it reacts with oxygen in the air. Something new has been formed; therefore, ...
Tuesday, March 1, 2011 at 9:44pm by DrBob222
7th grade
After taking a shower, you notice taht small droplets on the mirror. Explain how this happens and what change its going through. physical and chemical change.
Friday, September 25, 2009 at 12:58pm by Kenia
IPC
Element A and element B have bonded and formed compound AB. Which of the following statements is true? A) Compound AB has chemical and physical properties that are completely different from those of A and B. B) Compound AB has chemical and physical properties that are a blend ...
Thursday, November 4, 2010 at 4:46pm by Kaitlin
science chemical changes
Two examples of helpful chemical changes and 2 examples of harmful chemical change. For each chemical change, an example of a "tell-tale" sign.
Monday, November 6, 2006 at 6:59pm by denean
chemistry
ok so im learning about physical and chemical change and im just lost. like for instance, if u are cooking an egg would it be physical cuz it changs from a liquid to a solid?
Tuesday, October 7, 2008 at 6:53pm by eao
Changes in Matter
Which of the following everyday activities are physical changes, and which are chemical changes? a)salting ice on a driveway b)burning leaves c)mixing sand with soil d)composting cut vegetation e)using a glue gun a = physical b = chemical c = ? d = ? e = chemical Please ...
Monday, March 22, 2010 at 7:21pm by Sara
science
Please check these! Physical or Chemical properties? 1. solubility = physical 2. melting point = physical 3. reacts with water to form a gas = physical
Wednesday, September 12, 2012 at 10:54pm by Reed
chemistry
write three physical change and three chemical change and their similarity and give examples
Wednesday, January 19, 2011 at 11:39am by Mohamed shiko
chemistry
write three physical change and three chemical change and their similarity and give an examples
Wednesday, January 19, 2011 at 11:36am by Mohamed shiko
science
wax burning of a candle is actually a physical reaction/change not a chemical reaction/change
Friday, October 20, 2006 at 2:34pm by kate
Chemistry
Is crystallization a chemical or physical change?
Sunday, November 14, 2010 at 8:28pm by Lucy X
College Chemistry
Is this a physical or chemical change?
Friday, September 10, 2010 at 7:59pm by Becky
chemistry
is motor oil a homogeneous mixture or a compound? why? is iron smelting a chemical or physical process? I call oil a homogeneous mixture. Look up the definition of a mixture and the definition of a compound. Motor oil contains a number of different "oils" as well as ...
Sunday, September 17, 2006 at 10:03pm by helly
science
when the candle is heated it melts (physical change) and when it burns it is a chemical change. candle wax is made from hydrogen and carbon. im doing this homework too!!!!!
Saturday, October 21, 2006 at 10:00am by ME!
scince
What is the difference between chemical and physical change?
Thursday, January 3, 2013 at 3:37pm by eduarda
science
what is the difference between a physical change and a chemical reaction
Thursday, March 10, 2011 at 5:16pm by hi
science
what are the differences between a physical and a chemical change.
Friday, November 30, 2007 at 1:13pm by magda
chemistry
When two solutions are mixed and a new color is observed, is this color change an indication that a chemical reaction has occurred? Explain. It is not possible to directly observe chemical bonds breaking and forming during a reaction, molecules and atoms are way too small. ...
Friday, October 5, 2012 at 5:26pm by chemdummy
Chem Lab
Na turns gray in air. The gray color is physical, the reaction of Na to the oxide is chemical. Baking soda loses weight on heating due to NaHCO3 ==> Na2CO3 + H2O which is a chemical change.
Friday, April 23, 2010 at 5:59pm by DrBob222
College Chemistry
A plant grows. Is that a chemical or physical change?
Friday, September 10, 2010 at 8:00pm by Becky
9th grade
1. Try here: http://search.yahoo.com/search?fr=mcafee&p=how+can+an+egg+be+a+chemical+change%3F 2. try here: http://search.yahoo.com/search?fr=mcafee&p=how+can+an+antacid+tablet+be+a+physical+and+a+chemical+change%3F Sra
Thursday, September 23, 2010 at 4:50pm by SraJMcGin
chemistry
When Kl and Pb (NO3)2 is combined, is this a chemical or physical change?
Monday, October 5, 2009 at 6:15pm by kate
Chemistry
IS glass etching by Hydrofluoric acid a physical or chemical change? Thanks you
Saturday, February 16, 2008 at 2:07pm by ss
science
sweet is a chemical property,as all taste is chemical in nature. solid, liquid, are physical properties None of the choices are clear physical properties, however, sweet is definitely a chemical property. Water is not a property at all, so I dont know what was meant. sugar, ...
Wednesday, February 18, 2009 at 10:54pm by bobpursley
science
can you please tell me which catergory these belong in chemical or physical property? 1. arrangement of particles have changed 2. absorb or release. energy(endothermic/exothermic reactions) 3. change in appearance only. 4. cant be undone. 5. size and shape may change
Wednesday, November 28, 2012 at 6:16pm by kimberly
Science =____= ASAP!!!
Is Adding Vinegar to Yeast A Physical or a Chemical Change????
Wednesday, November 24, 2010 at 8:19pm by Sumaiya
Cemistry
Can an object experience both a physical and chemical change at the same time?
Tuesday, September 14, 2010 at 11:24pm by Jim
College Chemistry
When you bake cake batter it solidifies. Is this a physical or chemical change?
Friday, September 10, 2010 at 7:58pm by Becky
Chemistry
3. Dissolving salt in water is a physical change- F It was Na ions and Cl ions in the solid form; it's Na ions and Cl ions in the dissolved form. physical change 14. Burning newspaper is a physical change- F I suppose the ACT of burning a newspaper is a physical change but...
Tuesday, October 19, 2010 at 12:18pm by DrBob222
science chemical changes
What is the only way that a chemical change can be undone? With another chemical change? Hi! Very nice site! Thanks you very much! vkzZGKAAHUo Hello! Good Site! Thanks you! nungqxjmcbau
Monday, November 6, 2006 at 6:59pm by bob
science
What happens when a candle is alight is the subject. Explained both changes using the Big Idea of Energy? Can anyone help please or explain? I don't understand the question. Can you repost and clarify please? What happens when a candle is alight (on one side we had to show...
Friday, October 20, 2006 at 2:34pm by liverpool
science
When a candle burns the wax melts ( a physical change). Some of the melted wax changes into gas which burns with the flame. This is a chemical change.
Saturday, October 21, 2006 at 10:00am by claire
To: Bobpursely
You helped me with my observations yesterday, but I need help with my questions as well. I tried to answer as many as I could by myself, but I'm having difficulties understanding some. Pointing me towards the right direction would be helpful, thanks. Questions: Which ...
Wednesday, April 7, 2010 at 7:46pm by Sara
science
no. i dont now how to draw the particle diagrams to show the chemical and physical change
Friday, October 20, 2006 at 2:34pm by Lisa
Science
What has a physical and chemical change at the same time, apart from a candle burning wood.
Tuesday, December 5, 2006 at 3:06pm by mark
physics/chemistry
Electrical conductivity is a physical property. A chemical property involves a change that occurs. However, when electricity passes through an object or substance, no change occurs.
Tuesday, February 21, 2012 at 10:04am by Raf
Changes in Matter
a is right. b is right. e is wrong. c. mixing sand with soil. What different substance was formed? None, therefore, this a physical change. Same as adding water to a glass from the faucet. d.This can be viewed two ways. If you are talking about the composting itself (that is, ...
Monday, March 22, 2010 at 7:21pm by DrBob222
College Chemistry
When two solutions are mixed, small bubbles are formed. Is that a chemical or physical change?
Friday, September 10, 2010 at 7:57pm by Becky
science
Which of the following in NOT a physical or chemical change? A)crushing B)weighing C)melting D)passing electric current
Tuesday, November 10, 2009 at 5:42pm by Katherine
Chemistry
Also, is the white powder a chemical change? since color changing is a chemical change.
Thursday, January 29, 2009 at 7:06pm by Chopsticks
Science
There may be many indicators of a chemical change. Here are a few although not all can categorically indicate a chemical change: •Gas or bubbles are formed •Heat, light, or sound is given off •Change in color •Different taste or smell (never taste or smell ...
Wednesday, January 18, 2012 at 8:25pm by Laruen
Please help me
Suppose a customer brings a gold bracelet to a jeweler and asks for it to be changed into a gold ring. Which of the following is true? (1 point) The physical property of color will be changed. The bracelet will go through a chemical change. The composition of the bracelet will...
Friday, April 19, 2013 at 6:49pm by Tamer
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