L ements & compounds
What is the definition of an element ?
Pure substance
Made of only 1 type of atom
cannot be broken down into simpler substances
Where are metals found on the Periodic Table of Elements ?
on the left side
What is meant by a “group” in the periodic table?
A vertical column of elements with similar chemical properties.
What is the function of anthers ?
To produce and release pollen.
Where does fertilization take place in a flowering plant ?
Inside the ovary.
What atoms are formed from a single proton and a single electron ?
hydrogen
How are symbols for elements written on the Periodic Table of Elements ?
Symbols for elements are written with one or two letters, always starting with a capital letter, followed by a lowercase letter if there is a second one.
What does the periodic table arrange elements in order of?
Increasing atomic number.
What is the function of the stigma?
To receive pollen.
What three conditions do seeds need to germinate ?
proper temperature, oxygen supply, water
What is the definition of a chemical compound ?
A chemical compound is a substance formed when two or more different elements are chemically bonded together in fixed proportions
As you go from left to right on the Periodic Table of Elements, the metallic character of the elements ......
[increases / decreases / stays the same]
decreases
How can you distinguish an element from a compound by looking at a chemical formula?
An element has only one type of symbol (e.g., O₂, Fe); a compound has more than one (e.g., H₂O, CO₂).
In what structure do seeds develop ?
Inside the ovules in the ovary
Name 3 things that cause animals to be attracted to flowers.
scent, nectar, colorful petals
Which one of these is NOT a mixture ?
air brass sodium chloride steel
Which one of these is an element ?
steel water sodium calcium chloride
sodium
What does the atomic number represent?
The atomic number represents the number of protons in the nucleus.
Describe how pollen from wind-pollinated plants is different from pollen from insect-pollinated plants.
Pollen from insect-pollinated plants is typically larger, stickier, or spiny to adhere to an insect's body, while pollen from wind-pollinated plants is smaller, lighter, and smooth to be easily carried by the wind.
Insect-pollinated plants produce less pollen, while wind-pollinated plants release enormous quantities to ensure some grains will land on a stigma by chance
What are the male and female gametes in flowering plants called ?
the male gamete is a nucleus within the pollen grain, and the female gamete is the egg cell found inside an ovule
Three properties of an element are: 1) it contains atoms with 2 electrons in the outer shell, 2) it has only one shell, 3) it can form a molecule with itself or other atoms, 4) it is a gas at room temperature
helium
Three properties of an element are: 1) it contains atoms with 5 electrons in the outer shell, 2) it can form a diatomic molecule [with itself], 3) it forms a gas at room temperature
nitrogen
Name the male and female reproductive parts of a flower.
Male: Stamen (anther + filament)
Female: Carpel (stigma, style, ovary)
What is pollination?
The transfer of pollen from the anther to the stigma.
How are wind pollinated flowers different from insect pollinated flowers ?
Wind-pollinated flowers have: dull colors, no smell, no nectar, have exposed anthers and feathery stigmas and produce small, light pollen
insect-pollinated flowers have: bright colors, scents, nectar, sticky, larger pollen grains with anthers and stigmas positioned to ensure contact with the insect