Which of the following observations is/are examples of chemical change? 1. Iron (Fe) rusts,...
Question:
Which of the following observations is/are examples of chemical change?
1. Iron (Fe) rusts, forming Fe2O3.
2. The density of water increases when it changes from a solid to a liquid.
3. Sodium chloride melts at 801 {eq}^o {/eq}C.
Choose :
- 2 and 3
- 1 only
- 3 only
- 2 only
- 1 and 2
Chemical Change:
A chemical change is a change where the substance in question becomes another substance after the process is done. One example of a chemical change is a chemical reaction. The resulting substance has different properties compared to the substance before the change as a result of its atoms or molecules being rearranged due to the process.
Answer and Explanation: 1
Become a Study.com member to unlock this answer! Create your account
View this answer
The correct answer here is 1 only.
The reason here is that for a chemical change, the identity of the substance changes. That is, the identity of...
See full answer below.
Ask a question
Our experts can answer your tough homework and study questions.
Ask a question Ask a questionSearch Answers
Learn more about this topic:
Get access to this video and our entire Q&A library
Chemical Change Lesson for Kids: Definition & Examples
from
Chapter 7 / Lesson 7
58K
A chemical change occurs due to a chemical reaction in which substances combine or decompose to form one or more different substances. Learn about the definition and examples of chemical change, and explore the properties of a chemical change.
Related to this Question
- Which of the following are physical changes and which are chemical changes? a) melting of sodium chloride b) pulverizing of rock salt c) burning of sulfur d) dissolving of salt in water
- What is a chemical change that involves water and oxygen and iron? Explain
- What are the observable changes that can indicate that a chemical change has occurred?
- Which of the following are examples of chemical changes? Check all that apply. A. The nail heads in your deck rust B. A cheese sandwich is toasted C. Milk turns sour in the refrigerator baking soda
- List four examples of chemical changes and four examples of physical changes.
- Describe the physical change that takes place when potassium chloride salt substitute dissolves in water. Why is this not a chemical change?
- Which of the following is a physical change? a. the condensation of water vapor b. the rusting of iron c. the baking of a potato d. the explosion of nitroglycerin
- Classify each of the following as a physical or chemical change: a. Iron rusting b. Boiling water c. Burning a candle d. Silver tarnishing
- Define physical change and chemical change. State which type of change occur in each of the following statement: yellow-green chloride gas attacks silvery sodium metal to form white crystals of sodium chloride(table salt).
- Which of the following describes a chemical change? a. The color of copper sulfate is blue. b. The density of mercury metal is 13.534 g/ml. c. The melting point of sodium chloride is 801 degrees C. d. Water evaporates from a beaker. e. Oxygen reacts with
- The statement "the iron rusted in water" describes a: a. chemical property b. physical property c. chemical change d. physical change
- What is evidence that shows a chemical change has occurred?
- Decide whether a physical or a chemical change is involved. Rusting of iron
- Which property of matter changes during a chemical change but not during a physical change?
- Which change is a physical change? (a) Wood burning (b) Iron rusting (c) Dynamite exploding (d) Gasoline evaporating.
- Sodium and potassium react violently with water. Is this a physical change or a chemical change? Explain.
- When heated, iron and sulfur form an iron sulfide that has different properties from either iron or sulfur. Is the formation of iron sulfide an example of a physical or chemical change? Explain.
- List two chemical changes and two physical changes that you could experience in everyday life. Explain how you know each is a chemical or physical change.
- How can you tell the difference between a physical change and a chemical change? Give examples of each.
- Which of the following is an example of a chemical change? A)Copper building materials develop a green patina over time. B)A match burns. C)Ethanol evaporates. D)Both A and B are examples of chemical change. E)All of the above are examples of chemical cha
- 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? a) Burning gasoline (combustion). b) Boiling a
- What type of change is melting iron chloride? Explain.
- What are physical changes and chemical changes? Explain the difference between them.
- What is a composition change? Is it a physical change or a chemical change?
- Which one of the following is an example of a chemical change? a. breaking a stick b. milk spoiling c. snow melting d. chopping wood
- Two changes are described below. 1. Water vapor condenses. 2. Liquid water separates into hydrogen and oxygen. Which statement is true about the two changes? A. Both are chemical changes because new substances are formed. B. Both are physical chang
- An example of a chemical change is.
- Is iron rusting a chemical or physical change? A) Chemical B) Physical C) Both A and B D) None of the above
- Which of the following is an example of a change of state? 1. Snow blows to form snowdrifts 2. Sodium metal and chlorine gas from salt crystals 3. Dry ice disappears 4. Grilling a steak turns it bro
- What is a physical change? a. a change of state b. a change that can be measured without reference to other substances c. a change in reactivity d. a change of atomic structure
- Which of the changes are chemical changes? a. A candle is burned. b. A silver teapot turns black. c. Sugar crystals are ground to a fine powder. d. Candle wax is melted. e. Two clear colorless sa
- Which of the following is not usually evidence of a chemical change? a. a color change b. a temperature decrease c. a new smell d. a change in appearance only
- Which of the following can be considered evidence of a chemical change? (Choose the four that apply) A. Production of Bubbles B. Color Change C. Heat is released D. Freezing E. Melting F. Evaporation
- Describe the differences between physical change and chemical change in a material. Use examples related to the fire service to illustrate physical change and chemical change.
- Eight observations are listed below. What observations identify chemical properties? (a) Sugar is soluble in water. (b) Water boils at 100 degrees Celsius. (c) Ultraviolet light converts O_3 (ozone) to O_2 (oxygen). (d) Ice is less dense than water.
- Which of the following represent physical properties or changes, and which represent chemical properties or changes? a. You curl your hair with a curling iron. b. You curl your hair by getting a [{MathJax fullWidth='false' `` }]permanent wave" at the hair
- Which of the following is an example of a physical change? (a) grinding coffee beans (b) converting water to hydrogen and oxygen (c) digesting a cheeseburger (d) burning coal.
- Which is a physical change? a. Steam is condensed to water. b. Water is decomposed by an electric current. c. Iron rusts in air. d. A piece of paper is burned.
- What are properties that describe how matter reacts to change into other chemically different substances having different properties called?
- Which of the following is a physical change? a. Steam is condensed to water. b. Water is decomposed by an electric current. c. Iron rusts in air. d. A piece of paper is burned.
- Explain changes that occur when the following substances are separated heated in oven crucible: a. copper metal b. copper nitrate
- Which of the following is an example of a chemical change? (a) Water boiling (b) Ice melting (c) Rusting of a nail (d) Alcohol evaporating (e) Iodine vaporizing.
- Which of the following describe chemical properties? Check all that apply. - Iodine (a purple solid) becomes a purple gas. - Titanium is less dense that iron. - Water freezes at 0 degrees C. - Sugar burns in air to form water and carbon dioxide.
- Distinguish between chemical changes and physical changes, and give two specific examples of each.
- Which statement best describes what happens when ice melts? a. This is a chemical change, and the molecules move farther apart. b. This is a physical change, and the molecules move closer together. c. This is a physical change, and the molecules move fart
- Is dissolving salt into water a physical change or a chemical change? Briefly explain your choice.
- Are changes in state physical or chemical changes? Explain.
- Classify each of the following as a ''physical'' or ''chemical'' change or property. a. Copper metal combines with substances in the air to form a green patina that protects the copper from further reaction. b. Bread turns brown when you heat it in a to
- What is the difference between a physical change and a chemical change?
- What chemical change occurs when a wax candle burns? A) The wax near the flame melts. B) The molten wax is pulled upwards through the wick. C) The wax within the wick is heated to about 600 degrees Celsius. D) The heated wax molecules combine with oxygen
- What is the difference between a chemical change and a physical change?
- Which of the following describe a physical change? Choose all that apply. a) Crushing a dry leaf b) Carbon dioxide and water are produced when gasoline is burned c) Evaporation of water from a lake d) Burning your chemistry textbook e) Sulfur and hydrogen
- Which does not indicate a chemical change may be happening? a. burn b. melt c. rot d. ferment
- Describe physical and chemical changes and their qualities.
- Which of the following observations are examples of physical properties of aluminum? 1) When aluminum is placed in hydrochloric acid, hydrogen gas is released 2) aluminum melts at 660 degrees C 3) aluminum is a good electrical conductor A. 1 and 2 B
- What chemical change occurs when a wax candle burns? a. The wax near the flame melts. b. The molten wax is pulled upwards through the wick. c. The heated wax molecules combine with oxygen molecules. d. The wax within the wick is heated to about 600 degree
- What is the difference between physical and chemical change? For example, if you are cooking an egg, would it be a physical change because it changes from a liquid to a solid?
- Define the following terms: physical property, physical change, chemical property, and chemical change.
- If you add distilled water to Na2So4, to CaCO3, and to SiO2, what change happens in each. A chemical change, a physical change, or no change?
- Which of the following statements best describes what happens when chocolate melts? a) This is a physical change, and the molecules move farther apart. b) This is a chemical change, and the molecules move farther apart. c) This is a physical change, an
- Which event always involves a chemical change? a. boiling b. melting c. conducting d. burning
- When water boils, steam forms. When vinegar and baking soda combine, carbon dioxide gas is released. Which change is physical and which change is chemical? How do you know?
- What type of change occurs when water changes from a solid to a liquid? a. a phase change b. a physical change c. an irreversible change d. both a and b
- What would have to be done to water to make it change chemically (that is, make it change into the substances that compose it: hydrogen and oxygen)? Remember, boiling water will not change it chemically, but will only cause a phase change.
- Which of the following is an example of physical change? A)Sugar is dissolved in water. B)Tea is brewed. C)Dry ice sublimes. D)Ice (solid water)melts. E)All of the above are examples of physical change.
- Explain briefly why a sample of an element having a melting point of approximately 30.0 degrees C might melt in open air. Is this a physical change or a chemical change?
- Which of the following procedures involves a physical change in one of the substances? (a) Separating an oil from solution by cooling it. (b) Allowing a nail to rust. (c) Creating salt by reacting sod
- Which answer best completes the following sentence? {Blank} is an example of physical change while {blank} is an example of a chemical change. a. Evaporating rubbing alcohol, boiling nitrogen b. Burning wood, dissolving salt in water c. Boiling water,
- Why are burning candles and rusting nails examples of chemical changes?
- Which of the following is an example of a chemical change? A)tea brewing B)water boiling C)leaves turning colour in the fall D)salt dissolving in water E)None of the above is a chemical change.
- Which of the following observations demonstrates that a solid sample is a compound? a. It cannot be broken down into simpler substances by chemical methods. b. Heating the substance causes no visible color change. c. Crushing the sample does not affect it
- Which of the following provides evidence that a chemical change has taken place? a. the original substance can be recovered by physical processes b. a gas is formed when two liquids are mixed c. some pieces of substances get smaller or disappear d. one su
- What is the name of a change that occurs when one or more substances change into entirely new substances with different properties?
- List three clues that indicate that a chemical change has taken place.
- Is ice melting a chemical change or a physical change? Explain.
- Evaporating is a sign of which kind of change? a. chemical b. physical
- What chemical changes you expect for epigallocatechin gallate when it is heated in boiling water for 10 minutes?
- Consider the burning of gasoline and the evaporation of gasoline. Which process represents a chemical change and which represents a physical change? Explain.
- Would you expect a chemical change to be always accompanied by a physical change? Explain?
- Explain how chemical changes in matter take place.
- Which of the following is not a physical change? a. grinding b. cutting c. boiling d. burning
- Is bending a nail with a hammer an example of a physical change or a chemical change? Explain.
- Which of the following is an example of a physical change ? A) Zinc metal is added to hydrochloric acid and a gas is released. B) Concentrated hydrochloric acid is diluted with water. C) Acid rain cau
- Classify each of the following as either a physical or chemical change (or property). a. Milk curdles if a few drops of lemon juice are added to it. b. Butter turns rancid if it is left exposed at room temperature. c. Salad dressing separates into laye
- Describe whether the given statement describes a physical or chemical property. d) iron can rust
- Which of the following is a physical change? A) Electrolysis of water to hydrogen gas and oxygen gas. B) Burning oil. C) Boiling water. D) Tarnishing of silverware.
- Is crushing rock salt a physical change or a chemical change? Explain.
- When fireworks explode, is this a physical change or a chemical change? Explain.
- Classify each of the following as a physical or chemical change or property. a. If you wash your jeans with chlorine bleach, they will fade. b. If you spill some nail polish remover on your skin, it will evaporate quickly. c. When making ice cream at h
- What causes metals to rust and what are the chemical reactions that occur to cause rusting?
- Discuss the various phases of matter and their physical and chemical changes.
- Which of the following is an example of a physical change? a. ironing a cotton shirt b. burning a candle c. a banana ripening d. making toast
- Is the rusting of iron a physical or chemical process? Explain.
- Is burning sulfur a physical change or a chemical change? Explain.
- Which of the following is a chemical change? a. burning natural gas. b. melting ice. c. hammering gold into foil. d. cutting a tomato. e. cutting paper.
- A chemical change involves a change in ________. a. how atoms are bonded b. the elements of a molecule c. phase
- Is a composition change a chemical change or a physical change?
- Which of the following are factors or substances that encourage the rusting of iron metal? Sodium chloride solution Nitrogen gas Magnetic field Magnesium metal in electrical contact with iron Lead metal in electrical contact with iron Polishing the
- Is the decomposition of water into hydrogen and oxygen a physical change or a chemical change? Explain.
- Classify each of the following as a ''physical'' or ''chemical'' change or property. a. A log of wood is chopped up with an axe into smaller pieces of wood. b. A log of wood is burned in a fireplace.
Explore our homework questions and answers library
Browse
by subject