4 below are several substances present in cereal. look at the diagram of each and decide if it is an…
4 below are several substances present in cereal. look at the diagram of each and decide if it is an element, compound, or mixture.\n| substance | diagram | e, c or m? | what made you classify it this way? |\n|--|--|--|--|--|\n| water | | | |\n| sugar (glucose) | | | |\n| salt | | | |\n| vitamin d c₂₇h₄₄o₃ | | | |\n| copper (trace amounts) | | | |\n| milk (added to eat) | | | |\n| manganese (trace amounts) | | | |\n| tripotassium phosphate k₃po₄ | | | |\n| calcium carbonate caco₃ | | | |\n| stainless steel spoon | | | |
Answer
Explanation:
Step1: Recall definitions
An element consists of only one - type of atom, a compound consists of two or more different types of atoms chemically combined, and a mixture contains two or more substances that are not chemically combined.
Step2: Analyze water ($H_2O$)
It has hydrogen and oxygen atoms chemically bonded, so it is a compound (C). Reason: Different atoms ($H$ and $O$) are chemically combined.
Step3: Analyze sugar (glucose)
It has carbon, hydrogen, and oxygen atoms chemically bonded, so it is a compound (C). Reason: Multiple types of atoms ($C$, $H$, $O$) are chemically combined.
Step4: Analyze salt ($NaCl$)
It has sodium and chlorine atoms chemically bonded, so it is a compound (C). Reason: Different atoms ($Na$ and $Cl$) are chemically combined.
Step5: Analyze vitamin D ($C_{27}H_{44}O_3$)
It has carbon, hydrogen, and oxygen atoms chemically bonded, so it is a compound (C). Reason: Multiple types of atoms ($C$, $H$, $O$) are chemically combined.
Step6: Analyze copper
It consists of only copper atoms, so it is an element (E). Reason: Only one - type of atom ($Cu$).
Step7: Analyze milk
It contains fat, whey, lactose, etc., which are not chemically combined, so it is a mixture (M). Reason: Multiple substances are physically mixed.
Step8: Analyze manganese
It consists of only manganese atoms, so it is an element (E). Reason: Only one - type of atom ($Mn$).
Step9: Analyze tripotassium phosphate ($K_3PO_4$)
It has potassium, phosphorus, and oxygen atoms chemically bonded, so it is a compound (C). Reason: Different atoms ($K$, $P$, $O$) are chemically combined.
Step10: Analyze calcium carbonate ($CaCO_3$)
It has calcium, carbon, and oxygen atoms chemically bonded, so it is a compound (C). Reason: Different atoms ($Ca$, $C$, $O$) are chemically combined.
Step11: Analyze stainless - steel spoon
It is a mixture of iron, chromium, nickel, etc., so it is a mixture (M). Reason: Multiple metals are physically mixed.
Answer:
| Substance | E, C or M? | What made you classify it this way? |
|---|---|---|
| Water | C | Different atoms ($H$ and $O$) are chemically combined |
| Sugar (Glucose) | C | Multiple types of atoms ($C$, $H$, $O$) are chemically combined |
| Salt | C | Different atoms ($Na$ and $Cl$) are chemically combined |
| Vitamin D | C | Multiple types of atoms ($C$, $H$, $O$) are chemically combined |
| Copper | E | Only one - type of atom ($Cu$) |
| Milk | M | Multiple substances are physically mixed |
| Manganese | E | Only one - type of atom ($Mn$) |
| Tripotassium phosphate | C | Different atoms ($K$, $P$, $O$) are chemically combined |
| Calcium carbonate | C | Different atoms ($Ca$, $C$, $O$) are chemically combined |
| Stainless - steel spoon | M | Multiple metals are physically mixed |