匿名使用者
匿名使用者 發問時間: 社會與文化語言 · 1 0 年前

Physical &Chemical reaction的問題

1.Describe the difference between a physical change and a chemical change.

2.Which of the following everyday activities are physical changes,and which are chemical changes?(這題是要說明哪些是化學變化哪些事物理變化的吧 我想...)

(a)salting ice on a driveway

(b)burning leaves

(c)mixing sand with soil

(d)composting cut vegetation

(e)using a glue gun

3.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

4.Which of the following are examples of a chemical change?

(a)corrosion reactions

(b)combustion reactions

(c)dissolving of sugar

(d)evaporation of water

(e)decaying reactions

(f)digestion of food

5.Make a list of five physical changes and five chemical changes that you see in your daily life.

6.If you cut a piece of paper in two,do the properties of the paper change?

If you cut these two pieces of paper in half,do the properties change?

If you repeat this process indefinitely,would there come a time when the properties could change?Explain your thinking.

謝謝大家 幫我回答一下

我腦筋轉不過來啦 幫個忙謝謝你們

已更新項目:

不好意思請大家用英文= =

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4 個解答

評分
  • 1 0 年前
    最佳解答

    1.Describe the difference between a physical change and a chemical change.(請描述物理變化和化學變化之間的不同)

    Physical change: A change that affects the size, shape or color of a substance but does not affect its composition. A change that occurs in the physical property/properties of a substance without altering its composition.

    Chemical changes are present when the substance undergoes a chemical reaction and produces a new substance. A chemical change is a chemical reaction that will always take place for there to be a chemical change.

    2.Which of the following everyday activities are physical changes, and which are chemical changes?(下列日常生活中哪些情況是物理變化,哪些是化學變化?)

    (a)(用鹽溶化車道上的冰)- Physical change

    (b)(燃燒樹葉)- Chemical changes

    (c)(把沙子和土混在一起)- Physical change

    (d)(把砍下的植物作堆肥)- Chemical changes

    (e)(使用膠槍)- Physical change

    3.Which of the following are examples of a physical change?(下列哪些選項能夠解釋物理變化?) Ans: a,b,e(不確定)

    (a)(物質形態的改變) (b)(形狀和大小的改變) (c)(屬性改變)

    (d)(結構改變) (e)(物理量的改變):七個基本的物理量:長度、質量、時間、溫度、物質量、電流及光度

    (f)(成份改變)

    4.Which of the following are examples of a chemical change?(下列哪些選項能夠解釋化學變化?) Ans: a,b,e,f

    (a)(腐蝕反應) (b)(燃燒反應) (c)(糖溶解) (d)(水蒸發) (e)(腐爛)

    (f)(消化食物)

    5.Make a list of five physical changes and five chemical changes that you see in your daily life.(請各列舉5個你日常生活中會看到的物理和化學變化)

    (Physical)- Bending a toothpick, Smashing a can, Making instant coffee, Melting ice to water, Melting wax

    (Chemical)- Burning a match, Burning sugar, Making a cake from scratch, Making photos, Sour milk

    6.No, it doesn't. The properties of the paper don't change.

    (解釋部分)I think the paper still the same substance because we can stick the pieces of paper together with paste. The papers just change the size and shape but don't change the substance, properties and texture. Therefore, I consider that is a physical reaction.

    p.s. 最後的解釋 因為是自己打的 你就參考吧 @@"

    參考資料: 網路+自己
  • John
    Lv 6
    1 0 年前

    Being in love is an activity of chemical change to cause married.

    Making love is an activity of physical change to cause pregnancy

  • 1 0 年前

    1. 描述物理變化和化學變化的相異處。

    ANS:請自己描述

    2.Which of the following everyday activities are physical changes,and which are chemical changes?

    下列的日常生活行為中哪一個是物理變化,哪一個是化學變化?

    (a)salting ice on a driveway

    在車道上的冰灑鹽(物理變化)

    (b)burning leaves

    燃燒樹葉(化學變化)

    (c)mixing sand with soil

    把沙子和泥土混合(物理變化)

    (d)composting cut vegetation

    把砍下來的植物做堆肥(化學變化)

    (e)using a glue gun

    使用膠槍(物理變化)

    3.Which of the following are examples of a physical change?

    下列哪一個是物理變化的例子?a, b, e(應該吧^^")

    (a)change in physical state

    物質狀態的變化

    (b)change in size or shape

    大小或形狀的變化

    (c)change in properties

    性質的改變

    (d)change in texture

    組織的變化

    (e)change in physical quantities

    物理數量的變化

    (f)change in substances

    物質的變化

    4.Which of the following are examples of a chemical change?

    下列哪一個是化學變化的例子?a, b, e, f(或許吧^^")

    (a)corrosion reactions

    腐蝕作用

    (b)combustion reactions

    氧化作用

    (c)dissolving of sugar

    糖的溶解

    (d)evaporation of water

    水的蒸發

    (e)decaying reactions

    腐爛

    (f)digestion of food

    食物的消化

    5.Make a list of five physical changes and five chemical changes that you see in your daily life.

    列出你日常生活中各五種物理變化和化學變化

    ANS:請自己舉例

    6.If you cut a piece of paper in two,do the properties of the paper change?

    If you cut these two pieces of paper in half,do the properties change?

    If you repeat this process indefinitely,would there come a time when the properties could change?Explain your thinking.

    如果你把一張紙切成兩半,紙張的性質會改變嗎?

    ANS:不會

    如果你把這兩張紙切半,性質會改變嗎?

    ANS:不會

    如果你一直重複著剪紙的動作,有可能到後來紙張的性質會起變化嗎?解釋你的想法。

    ANS:不會,因為只是形狀、大小做變化而已,並沒有經過化學變化。

    參考資料: myself
  • 匿名使用者
    1 0 年前

    介紹各位大大~真的很不錯喔!!!各位大大可以看看喔!!! 

    這是手工包包 自己裁縫的 限量純手工包包 可以參考看看喔!!!

    http://class.ruten.com.tw/user/index00.php?s=09380...

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