Science Chapter 5 Flashcards
Ace Science
What are atoms made up of?
Three kind of particles: proton,neutrons and electrons.
Describe the structure of atoms
Proton and Neutron are grouped closely together in the centre of the atom and the electrons move around the nucleus.
Describe the properties of atoms
1)Protons and neutrons have more mass than electrons.
2) Protons and neutrons have same mass
3) Protons have a positive electrical charge
4) Neutrons have no electrical charge
5) Electrons have a negative electrical charge
Describe the structure of J.J. Thompson model of atoms.
electrons were scattered randomly throughout a positively charged matter
Describe the structure of Ernest Rutherford’s atoms.
The atom has a positively charged central part(nucleus). The electrons are distriputed around muscles. Mass of an atom is concentrated at nucleus. Compared with total volume of an atom, the volume of nucleus is meager
Describe what is weather
Weather is a state of the atmosphere, that changes from minutes to minutes, hour to hour, day to day or week to week.
Weather is a combination of temperature,humidity,precipitation,cloudiness,visibility and wind.
What is the difference between weather and climate?
Climate is the weather of a place that takes over for a longer time, usually more than 30 years. Meanwhile Weather can change in minutes or hours
Climate is affected by temperature and precipitation
What is the study of weather called
meteorology
What is the study of climate called
climatology
What are the differences between glacial and interglacial periods
GLACIAL PERIOD : when earth was frozen, temperature below 0 degree celcius
TODAY
INTERGLACIAL PERIOD : inter means between, SLIGHTLY WARMWER ( temperature above 0 degree celcius)
What are ice ages
ICE AGES : PERIOD WITH GLACIAL AND INTERGLACIAL PERIODS
How do scientists know the Earth was colder in the past?
GLACIERS ; are river of ice that move slowly downhill
The glaciers carry rocks with them, when glacier melts, the rock are left behind.
POLLEN EVIDENCE FOR GLACIAL AND INTERGLACIAL PERIODS
WHEN PLANT DIE : they decay
Without oxygen and slightly acid, they decay very slow and form a peat bog
Different layer of peat represent different periods
BOG USUALLY IS FOUND AT A FRESHWATER SOFT SPONGY GROUND THAT IS MADE UP OF DECAYED PLANT MATTER WHICH IS KNOWN AS PEAT.
How to reduce global warming
using fossil fuels to be burned to generate electricity.
Using Wind turbines to generate electricity
Solar Energy from the sun can be used to generate electricity
What is a matter?
Anything that takes up space and has mass
What is the Atomic Theory by John Dalton?
1.All matter is made up of atoms
2. Atoms of an elements are identical
3.Each element has different atoms
4.Atoms can engage in a chemical reactions
5.Atoms can neither be created nor destroyed
6. Atoms are indivisible
Describe the Model of Ernest Rutherford.
Atoms has a positively charged central part(nucleus). The electrons are distriputed around muscles. Mass of an atom is concentrated at nucleus. Compared with total volume of an atom, the volume of nucleus is meager
Is carbon dioxide a pure element and Why?
No it is not. CO2 consist of more than one type of atom
How are individual atoms held together
The electrostatic attraction between positive charge on the protons and negative charges on the electrons
What is an alloy
a metal with 2 or more elements
