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September 2, 2014

Search: chemitry--- physical & chemical change---

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chemitry--- physical & chemical change---
describe a physical change that appears to change chemically???
September 25, 2012 by Maria

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 chlorine gas—chemical property ...
April 23, 2010 by Help1001

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 (...
September 12, 2012 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 ...
September 9, 2006 by Joe

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 I ...
September 9, 2006 by George

9th grade
how can a egg be a chemical change? How can an antacid tablet be a physical and a chemical change?
September 23, 2010 by Nichole

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?
September 17, 2012 by Reed

CHEM
is breaking an egg a chemical or physical change? is cooking an egg a chemical or physical change?
October 17, 2010 by Elizabeth

science
Is melting ice a physical or chemical change? I think it is a physical change. Am I correct?
December 8, 2011 by Bob

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
March 22, 2010 by Sara

science
what is a chemical and physical change? http://www.onelook.com/ Type in chemical change, then physical change.
November 19, 2006 by physical change

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. ...
September 12, 2012 by Reed

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
March 22, 2010 by Sara

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 ...
April 17, 2012 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
February 20, 2008 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.
April 19, 2007 by Anonymous

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 one ...
September 11, 2008 by Moira

Physical Science 9
when an electric current is passed through water 2 gasses are formed is this a chemical or physical change
March 16, 2014 by Steve

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 zinc ...
October 7, 2009 by Emily

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 = ...
March 22, 2010 by Sara

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?
April 19, 2012 by Jess

Science
Is wood cut in boards is it a physical change or chemical change, explain
September 22, 2008 by Taylor

science
how can you tell the easiest way if something is a chemical change or physical change.
September 20, 2010 by layth

science
Give an example of a physical change and a chemical change for iron
April 21, 2010 by rhon

Chemistry
Would you expect a chemical change to be always accompanied by a physical change? Explain?
October 3, 2012 by shay

chemistry
Would you expect a chemical change to be always accompanied by a physical change?Pls. Explain
October 5, 2012 by Amanda

integrated physics and chem
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 ...
January 10, 2014 by Anonymous

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?
October 7, 2008 by eao

math
What vocabulary term causes iron to rust (Evaporation, condensation, chemical change or physical change)?
January 22, 2013 by Anonymous

chemistry
I want to make sure I am correct in classifying whether the following properties of hydrogen are chemical or physical. thanks 1. hydrogen will burN in in oxygen to form water. CHEMICAL 2. hydrogen does not support combustion. CHEMICAL 3.hydrogen is usually found combined with ...
April 8, 2014 by david

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?
October 4, 2009 by John

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.
September 4, 2012 by completeidiot

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.
September 25, 2006 by diego

Chemistry
The phrase “the heat absorbed or released by a system undergoing a physical or chemical change at constant pressure” is a. the change in enthalpy of the system. b. the change in internal energy of the system. c. the definition of a state function. d. the temperature change of ...
July 2, 2013 by Jessica

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 ...
November 4, 2010 by Kaitlin

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. Include ...
October 21, 2006 by liverpool

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
February 5, 2008 by jika

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.
September 25, 2009 by Kenia

science
ok, so i saw somebody already put this question here a few min ago but the answer wuz confusing... 25. When an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of –183°C and the other has a boiling ...
March 12, 2014 by jessiej

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 additives...
September 17, 2006 by helly

Chemistry
Is crystallization a chemical or physical change?
November 14, 2010 by Lucy X

science
Please check these! Physical or Chemical properties? 1. solubility = physical 2. melting point = physical 3. reacts with water to form a gas = physical
September 12, 2012 by Reed

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 ...
December 15, 2010 by m

Science
What did Antoine Lavoisier’s experiments demonstrate? a- Atoms always split into pairs during a chemical change. b- Mass is neither lost nor gained during a chemical change. c- Matter can be created during a chemical change. d- Energy is neither lost nor gained during a ...
February 9, 2014 by Steve

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 ...
March 22, 2010 by Sara

chemistry
write three physical change and three chemical change and their similarity and give examples
January 19, 2011 by Mohamed shiko

chemistry
write three physical change and three chemical change and their similarity and give an examples
January 19, 2011 by Mohamed shiko

science
what are the differences between a physical and a chemical change.
November 30, 2007 by magda

chemistry
When Kl and Pb (NO3)2 is combined, is this a chemical or physical change?
October 5, 2009 by kate

scince
What is the difference between chemical and physical change?
January 3, 2013 by eduarda

College Chemistry
A plant grows. Is that a chemical or physical change?
September 10, 2010 by Becky

science
what is the difference between a physical change and a chemical reaction
March 10, 2011 by hi

science chemical changes
What is the only way that a chemical change can be undone? With another chemical change?
November 6, 2006 by bob

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. ...
October 5, 2012 by chemdummy

Chemistry
IS glass etching by Hydrofluoric acid a physical or chemical change? Thanks you
February 16, 2008 by ss

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
November 28, 2012 by kimberly

College Chemistry
When you bake cake batter it solidifies. Is this a physical or chemical change?
September 10, 2010 by Becky

Cemistry
Can an object experience both a physical and chemical change at the same time?
September 14, 2010 by Jim

Science =____= ASAP!!!
Is Adding Vinegar to Yeast A Physical or a Chemical Change????
November 24, 2010 by Sumaiya

Science
What has a physical and chemical change at the same time, apart from a candle burning wood.
December 5, 2006 by mark

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 ...
October 20, 2006 by liverpool

Chemistry
I need someone to check these True or False questions for me please: 3. Dissolving salt in water is a physical change- F 14. Burning newspaper is a physical change- F 19. The liter is a measure of volume- T 20. The amount of heat and temperature of a substance are the same- F ...
October 19, 2010 by mysterychicken

physics
Under what conditions is mass conserved? A. Whenever the system is isolated or closed. B. Only when the change is a chemical one. C. Always. D. Only when the change is a physical one. I was thinking A.
March 11, 2014 by anonymous

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 changes ...
April 7, 2010 by Sara

science
Which of the following in NOT a physical or chemical change? A)crushing B)weighing C)melting D)passing electric current
November 10, 2009 by Katherine

College Chemistry
When two solutions are mixed, small bubbles are formed. Is that a chemical or physical change?
September 10, 2010 by Becky

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...
April 19, 2013 by Tamer

Chemistry
Suppose you place a kettle on the stove and boil some water.Is the steam that forms physical of chemical change?
April 16, 2010 by Emily

science
Johnny left a glass of milk on his bedside table for a week, and it spoiled. at the end of the week, the glass contained a yellow liquid with lumpy white chunks, and there was a terrible order. what can be concluded? A. the milk has undergone a physical change. B. the mass of ...
May 1, 2014 by ms.sue help please

10th grade
i neeed help determining whether the following changes are chemical or physical and why. i have some guesses but i wanted to have them verified. thanks. =) 1) mixing chalk and vinegar: chem. b/c it bubbles 2) mixing starch and iodine: physical b/c the iodine dissoles and the ...
August 16, 2009 by anonymous

Chemistry
Could I plese have an example of a everday experience of a chemical process for which a rate increases with temperature? I thought of ice melting but its a physical change...
February 19, 2008 by Matt

chemistry
Which of the following is an example of a chemical change (change in chemical composition) that involves starting with a liquid and ending up with a gas? Burning gasoline (combustion). Boiling acetone. A pond evaporating. Condensation of steam.
January 29, 2012 by k

Science ~CHECK MY WORK PLEASE~
Both carbon dioxide and water are pure substances. How are they similar to each other? A.) both substances have a set ratio of atoms that cannot be separated by physical means. B.) both substances have a set ratio of atoms that can be separated by physical means. C.) both ...
January 28, 2014 by Wendy

science
I need a little assistance. Can you help? The question which seems to be simple enough is What is a physical change? My son answered - A physical change is any change that alters the form or appearance of matter into a different substance. I do not agree. He is missing ...
September 17, 2012 by From a Mom

chemistry
Which best describes the physical change of an aluminum soda can after its crushed? A change in the mass of can B change in weight of can C change of volume of can D change in the specific heat of can
August 18, 2011 by Chriese

science
is this a chemical or physical change 1. a glowing splint placed in a test tube causes a loud pop 2. food coloring is added to cake icing to make it pink
October 6, 2007 by bella

Chemistry - physical, chemical and nuclear process
A healthy human body maintains a temperature of about 37.00C. Explain how physical, chemical and nuclear processes all contribute, directly or indirectly, to keeping the human body at a constant temperature.
February 25, 2011 by Farah

Chemistry - physical, chemical and nuclear process
A healthy human body maintains a temperature of about 37.00C. Explain how physical, chemical and nuclear processes all contribute, directly or indirectly, to keeping the human body at a constant temperature.
February 27, 2011 by Farah

Science
Both carbon dioxide and water are pure substances. How are they similar to each other? A.) both substances have a set ratio of atoms that cannot be separated by physical means. B.) both substances have a set ratio of atoms that can be separated by physical means. C.) both ...
April 15, 2014 by Naomi

year 7 science
Chemical and physical changes. please could someone help me i need to say whether the following are chemical or physical changes and explain why. I`ve looked myself but i can`t find anything that helps. grateful for any help .thanks Frying an egg , burning paper , mixing a ...
April 29, 2008 by choccy

Science
1. Density is the relationship between ____. (1 point) mass and volume cubic centimeters and pounds weight and volume grams and mass 2. Which of the following is NOT a possible sign of a chemical change? (1 point) a change in state a change in color the release of a gas the ...
April 16, 2013 by HELPMEASAP!

Physical Science
A sample of copper can be drawn into thin wire. Is this chemical or physical property?
September 9, 2008 by Mari

science
What are two chemical and two physical properties of water? Please help me. Thank you. physical properties: boiling point, freezing point,density, color, electrical conductivity chemical properties: reactivity with sodium. Reactivity and decomposition with electrictiy.
June 10, 2007 by Jj

science/chemistry
we did a lab on chemical change, where we had to see how a chemical change affcts mass. so we measure the mass of 20ml of copper solution, and 2cm(cubed) of steel wool, and then we mixed them into a flask. soon the steel wool turned rusy, and broke apart. and the duofilm(which...
October 15, 2007 by rachel

SCIENCE HELP! SOMEONE!
A student compared some chemical and physical properties of three pure substances. Her data are recorded in the chart above. What is a logical conclusion the student can draw about pure substances? A student compared some chemical and physical properties of three pure ...
April 24, 2014 by A.J

chemistry
Would Conducting electricity be considered a physical or chemical property of zinc i got physical but just want to make sure.
September 9, 2010 by Jack

science, pls explain this!
25. When an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of –183°C and the other has a boiling point of –253°C. Has a physical change or a chemical change occurred? Explain. (6 points) ok, can u ...
March 12, 2014 by ravenrothroxy !jinx!

Science. plz help!!
What is the physical and chemical characteristics of the element neon? p.s- a really need help i'm not joking. oh yeah and thank you for your time! I think I answered this last night but it may not have been your question. Anyway, go to www.webelements.com and click on element...
November 13, 2006 by Vicky

SCIENCE --- CHECK MY WORK PLS
help pls, check my work asap!?? 1) Which of the following is a chemical change? (1 point) Boiling of water*** Melting a cube of ice Dissolving 10 grams of salt in water Splitting water into hydrogen and oxygen 2) What is the mass of water that results from combining 2.0g of ...
February 3, 2014 by TTR+S<3

chemistry
Consider the following equations. For each, decide whether it represents a chemical reaction or a physical change. a. SnCl4(aq) + 4H2O(l)  Sn(OH)4(s) + 4HCl(aq) b. 4K(s) + O2(g)  2K2O(s) c. NaCl(s)  Na+(aq) + Cl-(aq)
July 3, 2011 by ABCD

science-plz help, this is urgent!plz!
we did a lab on chemical change, where we had to see how a chemical change affcts mass. so we measure the mass of 20ml of copper solution, and 2cm(cubed) of steel wool, and then we mixed them into a flask. soon the steel wool turned rusy, and broke apart. and the duofilm(which...
October 15, 2007 by haya

science-plz help, this is urgent!plz!
we did a lab on chemical change, where we had to see how a chemical change affcts mass. so we measure the mass of 20ml of copper solution, and 2cm(cubed) of steel wool, and then we mixed them into a flask. soon the steel wool turned rusy, and broke apart. and the duofilm(which...
October 15, 2007 by haya

i reallry need help plz-science
we did a lab on chemical change, where we had to see how a chemical change affcts mass. so we measure the mass of 20ml of copper solution, and 2cm(cubed) of steel wool, and then we mixed them into a flask. soon the steel wool turned rusy, and broke apart. and the duofilm(which...
October 15, 2007 by haya

Science
We did a experiment in class to recognize chemical change. I don't really get this question: Identify the combinations of chemicals in which chemical changes occurred. If the chemical changes occured in all of the combinations, then what would be a good answer? I get the ...
March 23, 2010 by Sara

Chemistry
Name four factors that can affect the rate of a chemical reaction. How does the rate of a chemical reaction change in response to a change in each factor? My answer: Four factors that can affect the rate of a chemical reaction are concentration, surface area, temperature, and ...
October 11, 2010 by Anonymous

Biology
Which of the following statements about the compound HCl is true? *The physical and chemical properties of HCl are different from those of H2 and Cl2. *Only the physical properties of HCl are different from those of H2 and Cl2. *Only the chemical properties of HCl are ...
August 15, 2013 by Cassie

College Chemistry
If you leave a glass of tap water out long enough, the water will evaporate and leave behind a white solid. Is this a chemical or physical change?
September 10, 2010 by Becky

Science
Water and gasoline are both clear liquids at room temperature. Describe one physical property and one chemical property that might be used to distinguish between them. Plz help physical:smell chemical: pH value What about density? The density of water is 1.00 g/cc and the ...
September 13, 2006 by Pam

SCIENCE
Is decomposition a natural chemical change? Is photosynthesis a natural chemical change? thanks!
November 11, 2010 by Pratigya

Read Y9 chemistry (then anwer this)
2a) Someone finds teo bottles without labels. Both are white solids. One of the white solids turns directly from a solid to a gas on heating. What is this type of change called? b) The other solid turns yellow on heating. On cooling it turns white again. What might this solid ...
September 10, 2008 by Moira

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