I need help classifying these as physical or chemical changes! 1. sodium metal exposed to air turns dark gray. 2. steam in a test tube condenses to moisture. 3. baking soda in vinegar releases bubbles. 4. water dissolves in vinegar

26,192 results
  1. chemistry

    sodium reacts completely with 0.142kg of chlorine, forming 234g of sodium chloride. What mass of sodium reacted? I know that for chemical changes the amounts should end up being equal, but I don't know how to set up the problem.

  2. 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

  3. Science/Chemistry

    Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model of a cobalt atom. Which statement about the model is correct? The model should show 27 protons and 32 neutrons. The model should show 27 protons and 27 neutrons.

  4. 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

  5. Science

    A banana turning brown when exposed to air is an example of. And the options for me are. A heterogeneous mixture, vaporization, a chemical change, an amorphous solid.

  6. Science

    Which of the following statements describes the difference between physical and chemical weathering? A.Physical weathering affects rocks, while chemical weathering affects only minerals. B.Physical weathering is caused by ice, while chemical weathering is

  7. Science

    1. Which of the following is an example of matter A.Leaves B.Shadows C.Light from the sun D.Sound

  8. chemistry

    Sodium (Na) metal undergoes a chemical reaction with chlorine (Cl) gas to yield sodium Cl, or common table salt. If 1.00 g of sodium reacts with 1.54 g of chlorine, 2.54 g of sodium chloride is formed and 17.9 kJ of heat is released. How much sodium and

  9. 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

  10. 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

  11. chemistry

    sodium metal reacts with hydrogen gas to yield solid sodium hydride ( NaH ). A reaction mixture contains 10.00 g sodium metal and 0.235 g of hydrogen gas. write a balanced chemical equation for this reaction? what is your limiting reactant? what is your

  12. 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 =

  13. Science 8th grade

    A scientist bends wires made of different metals to check their flexibility. Which of the following best justifies the type of change taking place? Physical change because shape is a physical property. Chemical change because shape is a physical property.

  14. Chemistry

    Automobile air bags employ a chemical reaction involving the rapid decomposition of sodium azide (NaN3) into sodium metal and nitrogen gas to inflate in a collision. How much sodium azide is required to decompose to inflate a 20.0 L air bag? Assume that

  15. Science

    When you measure the boiling point of mercury, you are investigating a ____? 1)chemical change 2)chemical property 3)physical change 4)physical property I think #3. This is a practice but want to make sure. Thanks,

  16. Science

    Use the words to fill in the blanks of the paragraphs. 1.plants 2.pieces 3.moisture 4.ice wedging 5.acids 6.carbon acid 7.freezing 8.chemical 9.oxidation 10.temperatures 11.minerals 12.climate 13.desert 14. mechanical 15.cracks 16 reacting Weathering is

  17. 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

  18. 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"

  19. 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

  20. 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

  21. chemistry

    All of the lanthanide metals react with HCl to form compounds having the formula MCl2,MCl3,or MCl4 (where M represents the metallic element). Each metal forms a single compound. A chemist has .250g sample of a transition metal, and wishes to identify the

  22. Mechanical engineering

    Sodium metal is immersed into a graduated cylinder that holds exactly 32.5ml.The sodium metal used to fill the cylinder weighs 405.5 grams.Calculate the density of sodium based on the given data.

  23. biology

    Black walnut trees produce a nontoxic chemical that becomes highly toxic when it is exposed to air or soil. How does this chemical help black walnut trees compete with plants growing nearby?

  24. 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,

  25. chemistry

    Based on the chemical formula, what type of compound is sodium fluoride (NaF)? Why? Sodium fluoride is an ionic compound because it is composed of a positive and negative ion (metal and nonmetal). A metallic compound would have multiple metal atoms bonded

  26. 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

  27. Chemistry

    Which of the following procedures involves a physical change in one of the substances? separating an oil from solution by cooling it

  28. chem.

    sodium metal is insoluble in ether. sodium metal dissolves in water to produce a gas. The copper bottom on a frying pan turns black after several heatings. Are these physical or chemical changes..

  29. 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

  30. 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

  31. 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 =

  32. Chemistry Balancing Equations

    I really need help with balancing these equations: PLEASE HELP!! 1. Sodium Hydrogen Sulfite reacts with hydrochloric acid to produce sulfur dioxide gas, water and sodium chloride 2. Sodium nitrate reacts with hydrochloric acid to produce nitrogen monoxide

  33. Chemistry

    A mass of aluminium metal is heated in a such in a such a way that is was exposed to air.(1.751g Al) A compound containing aluminium and oxygen is formed. It has a mass of 3.311 g. What is the empirical formula of aluminum oxide according to this

  34. Chemistry please check

    1. Which of the following would occur as saturated hydrocarbons? alkanes alkenes alkynes cycloalkynes ans: alkanes 2. There are millions of organic compounds but only thousands of inorganic compounds because atoms of elements other than carbon never

  35. Chemistry

    How do you do the question: react 3.50 g of solid sodium metal with water to produce hydrogen gas and sodium hydroxide. If,at the end of the reaction there is 6.8 L of solution, what is the concentration of sodium hydroxide? This is realy quite urgent. I

  36. 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

  37. 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

  38. Chemistry

    what mass in grams of sodium hydroxide is produced if 20.0g of sodium metal reacts with excess water according ro the chemical equation, Na(s)+H2O4->naoh(aq)+h2(g)

  39. Chemistry

    1. Which of the following will result in a chemical change? A. Melting ice to obtain water B. Evaporating alcohol into vapor C. Drying wood in a shed D. Burning coal in a furnace(My answer) 2. A salt is obtained as a reaction between A. a nonmetal and a

  40. chemistry

    Sodium metal is immersed into graduated cylinder that holds exactly 32.5 ml. The sodium metal used to fill the cylinder weighs 405.5 grams. Calculate the density of sodium based on the given data.

  41. science

    Please check these! Physical or Chemical properties? 1. solubility = physical 2. melting point = physical 3. reacts with water to form a gas = physical

  42. chemistry

    Sodium metal adopts a body-centered cubic structure with a density of 0.97g/cm3. A. Use this information and Avogadro's number to estimate the atomic radius of sodium. B. If it didn't react so vigorously, sodium could float on water. Use the answer from

  43. Chemistry

    The most abundant cation in seawater is the sodium ion. The evaporation of seawater gives a mixture of ionic compounds containing sodium combined with chloride, sulfate, carbonate, bicarbonate, bromide, fluoride, and tetrahydroxybrate.

  44. chemistry

    . Which of the following will result in a chemical change? A. Melting ice to obtain water B. Evaporating alcohol into vapor C. Drying wood in a shed D. Burning coal in a furnace 2. A salt is obtained as a reaction between A. a nonmetal and a metal. B. a

  45. chemistry

    is the formation of an aqueous solution with water, a physical or chemical property? physical..... because the substance doesn't change.....

  46. Chemistry

    I need help classifying these as physical and chemical properties! 1. sodium metal in chlorine gas releases luster. 2. sodium metal has a metallic silver luster. 3. sodium metal in water porduces hydrogen gas. 4. sodium metal melts to a liquid at 98

  47. 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

  48. science

    dr. halite combined sodium metal with chlorine gas to make sodium chlorine (table salt). The chemical reaction used up all of the metal and sll of the gas. If dr halite made 116 g of table salt and started with 68 g of chlorine gas, then how many grams of

  49. 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

  50. Chemistry

    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

  51. chemistry

    What mass in grams of sodium hydroxide is produced if 20.0 g of sodium metal reacts with excess water according to the chemical equation 2Na(s)+2H20(l)=2NaOH(aq)+H2(g)? Please show me step by step how to do this because I have 5 other questions like this

  52. Science

    Mr. Belvedere designs an experiment to test the effect of different colored light on the rate of photosynthesis. He sets up his experiment using elodea, 25watt bulbs, 30mL of distilled water, and 5g of sodium bicarbonate. Plant 1 is exposed to no light.

  53. science

    the list below shows three ways in which metals can react. a) strongly heat the metal in the air. b)add small pieces of the metal to cold water. c)add small pieces of the metal to dilute acid. in each case choose a b or c calcium oxide hydrogen (using

  54. chemistry

    Are these physical property's of a pure compound? What are physical properts off this list???? molar weight reactivity with halogens volatility melting and boiling points hardness, brittleness odor density air sensitivity flammability radioactivity colour

  55. 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

  56. chemistry(rusting)

    i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right? however ,i have a problem.When i put the metal in the test

  57. chemistry(rusting)

    i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right? however ,i have a problem.When i put the metal in the test

  58. Chemistry

    Propose a method for determining the specific heat, Cp, for a metal like sodium which reacts with water. Allow the sodium to equilibrate in a metal calorimeter filled with inert gas. Measure the equilibrium temperature

  59. Chemistry

    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

  60. 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

  61. chemistry

    sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than hydrogen then hydrogen is produced instead of the metal at the positive electrode.

  62. Chemistry

    Describe what hard water is and how a water softening unit works. Provide balanced chemical equations to show how sodium sulphate can remove these ions (Magnesium and Calcium). The first was no problem, but I am having trouble trying to get through the

  63. science

    1. Which of the following is an example of matter? A. leaves

  64. chemistry

    Sodium metal adopts a body-centered cubic structure with a density of 0.97g/cm3. A. Use this information and Avogadro's number to estimate the atomic radius of sodium. B. If it didn't react so vigorously, sodium could float on water. Use the answer from

  65. Science

    1.Which of the following is an example of matter? Leaves*** Shadows Light from the sun Sound 2.Which of the following is an example of a chemical property of matter? Ability to melt**** Ability to freeze Ability to react Ability to break 3. The physical

  66. general physics

    A piece of metal, when weighed in air, has a weight of 20.7 N. When completely submerged in blood (ĉ = 1060 kg/m3), the metal has a weight of 12.7 N. Based on the values from table 11.1 in the text, what is the most likely metal? Here is the answer but

  67. Chemistry check and help

    what is ... Sodium bisulphate hydroiodic acid ammonium dihydrogen phosphate Zn(HCrO4)2 Calcium metal ferrous bromide sodium carbide phosphate radical Check... sodium bicarbonate NaHCO3

  68. chem

    I need help classifying these as physical or chemical changes! 1. sodium metal exposed to air turns dark gray. 2. steam in a test tube condenses to moisture. 3. baking soda in vinegar releases bubbles. 4. water dissolves in vinegar to give a solution. 5.

  69. Physical Science

    When sodium metal combines with chlorine gas, solid sodium chloride forms. is this a physical or chemical change?

  70. 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

  71. Science

    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

  72. chem

    which metal has sililar properties (chemical/physical) to platinum metal?

  73. Chemistry

    The ¡°air¡± that fills the air-bags installed in automobiles is actually nitrogen gas produced by the decomposition of sodium azide, NaN3. Assuming that the decomposition of sodium azide produces both nitrogen and sodium metal (Na), what volume, in

  74. Analytical Chem

    If a solution of NaOH is left exposed to room air, what will happen to its pH? What chemical equilibrium is responsible for this effect?

  75. chemistry

    We did this in a lab and nothing happened, but I'm pretty sure something was supposed to happen, so my question is: What happens when you put a pellet of sodiumhydroxide on a watch glass and observe it for 5-10 minutes? If there were hudidity in the air,

  76. Criminal Justice/Terrorism

    Medical decontamination is far less common than technical decontamination because it: A. only involves the process of cleaning injured or exposed individuals. B. applies only to medical personnel and first responders. C. is used only for decontamination of

  77. 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

  78. Chemestry form two

    Balance chemical equations to show the reactions that occur when apice of sodium metal is ex posed to atmosphere

  79. chemistry(rusting)

    i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right? however ,i have a problem.When i put the metal in the test

  80. chemistry(rusting)

    i know that metal placed in more acidic solution will produce rust faster.but why metal placed near the sea shore will easily have rust?the wind with moisture which contains salt solution,right? however ,i have a problem.When i put the metal in the test

  81. Chemistry

    When sodium Metal is dropped into water, all the metal reacts in the equation shown below. What mass of hydrogen is liberated from a 46.0 gram piece of sodium? 2Na(s)+2H2O(I) > 2NaOH(aq)+H2(g)

  82. science

    Technetium is a transition metal similar to manganese. what chemical and physical properties would you expect technetium to have?

  83. 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.

  84. AP Chemistry

    What mass in grams of sodium hydroxide is produced if 20.0 g of sodium metal reacts with excess water according to the chemical equation? 2Na(s)+2H20(l)=2NaOH(aq)+Hs(g) How many moles of Ag can be produced if 350. g of Cu are reacted with excess AgNO3

  85. Science

    1.what chemical properties of nail polish remover makes it dangerous? 2.Surgeons sometimes use metal plates and screws to hold broken bones together. What chemical properties do you think the metal should have?

  86. science again last question

    Can a chemical characteristic for the element Neon be that it is toxic to the air? thanks agian and that's the last question!! thank you!!! I'd say not. Try the chemical or physical properties listed here:

  87. Chemistry

    Does sodium metal react with potassium hydroxide solution? No. It would be a displacement reaction and this only works if the metal is higher in the activity series than the one it wants to displace. Given that potassium is the highest ranked metal (sodium

  88. chemistry

    What is formed at the anode and cathode when the following solutions are electrolysed? sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than

  89. chemistry

    What is formed at the anode and cathode when the following solutions are electrolysed? sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than

  90. chemisrty

    Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt). 2Na(s) + Cl2(g) 2NaCl(s) If 3.6 moles of chlorine react with sufficient sodium, how many grams of sodium chloride will be formed?

  91. Chemistry

    You have a badly tarnished silver teapot. The tarnish is a result of the silver metal reacting with the oxygen in the air according to 4Ag(s) + O2(g) = 2Ag2O(s), Delta H = -62.2 kJ/mol You carefully clean the teapot and then, out of curiosity, you weigh

  92. 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

  93. Science

    What is a Chemical property? What is a Physical property? -thanks Usher and im not the singer..... http://www.onelook.com/ Type in chemical property, then, do it again with physical property.

  94. Photography

    Suppose you have three negatives: an over-exposed one, an under exposed one, and a correctly exposed one. Which would require the longest exposure during contact printing?

  95. chemistry

    If 9.20 g of sodium metal reacts with chlorine gas to make sodium chloride, how mnay grams of chlorine are required to react completely with the sodium?

  96. science

    what is a chemical and physical change? http://www.onelook.com/ Type in chemical change, then physical change.

  97. science

    I dissolved two different white solids into water. One solid dissolved and gave off heat and the other became cold. Reading various texts online, I was not sure if these were physical or chemical changes. Some texts say if these solids are salts then these

  98. chemistry

    Would Conducting electricity be considered a physical or chemical property of zinc i got physical but just want to make sure.

  99. Science

    true or False in a physical change some of the physical properties of substance may be altered and the chemical composition remains the same

  100. chemistry

    If iron is exposed to air, it begins to rust. What conclusion can you make about air, based on this observation?

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