Chemistry

Chemistry, 31.07.2019 03:30, keshewar2671

Which is true about physical changes but not chemical changes? a. new substances are sometimes formed b. no new substances are formed c. there is rarely visible evidence of the change d. the change is not easily reversed

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Chemistry, 23.06.2019 17:10, gerardoblk5931

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.

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Chemistry, 23.06.2019 17:10, jwhit28

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.

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Chemistry, 29.06.2019 19:30, joejoefofana

Pure sodium metal explodes when it makes contact with water, and chlorine, in its natural state, is a deadly, poisonous gas. when these two chemicals combine, they form a harmless, white powder known as sodium chloride or table salt. which of the following statements does this information support? a. when substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances. b. heat must be added in order to change the chemical properties of substances. c. when substances are chemically combined, the properties of the new substances that are formed are the same as the properties of the original substances. d. the properties of substances change during chemical reactions but then later go back to their original condition.

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Chemistry, 04.07.2019 15:00, josecano2

Which of the following is not true of physical changes? question 3 options: substances change form or shape substances remain the same chemical bonds are formed or broken

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