Number of results: 21,484
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...
April 23, 2010 by Help1001
AP Chemistry Help!!
When you light a candle, the paraffin wax soon begins to melt. Paraffin wax is a covalent compound. Can you classify the melting of the wax as a chemical change or a physical change? If so, which is it? If you cannot classify it as chemical or physical, explain why not. ...
January 22, 2017 by Heather
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
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
When an electric current passes 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 chemical change occurred? Explain. I think it is a chemical ...
October 3, 2016 by Sami
Fat reacting with sodium hydroxide Is this a chemical or physical change My answer is chemical is this right answer Chemical A originally is buoyant in water; after it mixed with HCI, the new substance now sinks in water. My answer is physical change. Is this right?
January 12, 2017 by PLEASE CHECK MY ANSWER!!!!!!
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
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
What is anything that has mass and takes up space? 1) Weight 2) Volume 3) Density 4) Matter When you measure the boiling point of mercury, you are investigating a ____. 1) Chemical change 2) Chemical property 3) Physical change 4) Physical property An object weighing 90 N has ...
May 2, 2016 by jai
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
What is anything that has mass and takes up space? 1) Weight 2) Volume 3) Density 4) Matter When you measure the boiling point of mercury, you are investigating a ____. 1) Chemical change 2) Chemical property 3) Physical change 4) Physical property Ab object weighing 90 N has ...
April 6, 2016 by Lulu
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
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
when a current is passed through water during the process of electrolysis,two gases are formed. One gas has formed has a boiling point of -256 degrees celsius.Has a chemical or physical change occurred? Explain. ok i've already answered just need a few more sentences. This is ...
September 27, 2016 by Senpai onii-chan
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 + 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
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
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
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
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
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
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
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...
July 2, 2013 by Jessica
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
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
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
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. My answer: I would say ...
March 25, 2015 by Karen
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 ...
March 12, 2014 by jessiej
Label the following changes as CHEMICAL or PHYSICAL change 1. Fat reacting with sodium hydroxide 2. Chemical A originally is buoyant in water; after it mixed with HCI, the new substance now sinks in water Label the following reactions as exothermic or endothermic 1. Ammonium ...
January 13, 2017 by Megan
What is the difference between a chemical change and a chemical reaction?? My answer: A chemical change leads to a solidifed chemical reaction but more or less they are the same thing because it's a change in which one or more pure substances are converted into diffeent pure ...
September 6, 2015 by Sam
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
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
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
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
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
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
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
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
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
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
Johnny left a glass of milk on his bedside table for week, and it spoiled. At the end of the weel, the glass contained a yellow liquid with lumpy white chunks, and there was a terrible odor. What can be concluded? A. The milk has undergone a physical change B. The mass of the ...
February 25, 2016 by Anonymous
when an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has the 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.
October 15, 2015 by Myla
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
Johhny 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 white chunks, and there was a terrible odor. What can be concluded? A. The milk has undergone a physical change. B. The mass of the ...
November 14, 2014 by Callie
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
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 odor. What can be concluded? a) The milk has undergone a physical change. b) The mass of ...
April 16, 2015 by Ann
Could I please 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
A pure white solid material that looks like table salt releases gas when heated under certain conditions. There is no change in the appearance of the solid, but the reactivity of the material changes. Did a chemical or physical change occur? How do you know? Was the original ...
October 7, 2014 by Kelley
After being heated, an enzyme loses its ability to catalyze a reaction. What change occurred to the enzyme? A. A physical change, because cooling will restore the enzyme's function C. A physical change, because intermolecular forces were overcome
March 19, 2015 by Cortney
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
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
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
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 hydrogen with 16.0g of oxygen? (1 ...
January 28, 2015 by Skylar
How does a change in one nucleotide in one triplet code can change the nature of a protein and therefore the form of the trait ? I believe this has something to do with mutations. I know that mutation may result from errors in DNA replication or recombination, or physical or ...
April 7, 2016 by Jamie
Multiple Choice 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 2.0 g of hydrogen with 16.0...
April 17, 2015 by Pauly