States of Matter物質的狀態(tài)
Matter is made of?atomsand?molecules.物質是由原子和分子構成的。
Water, for example, is the H2O molecule.?例如，水是H2O分子。
This means that a molecule of water has 3 atoms.?這意味著一個水分子有3個原子。
A water molecule has 2?hydrogen atoms and 1?oxygen atom.一個水分子有兩個氫原子和一個氧原子。
Substances like sugar havemanyatoms intheirmolecules.?像糖這樣的物質分子中有許多原子。
A molecule of sugar has many atoms, including carbon, hydrogen and oxygen.糖分子有許多原子，包括碳、氫和氧。
What is matter made of? atoms and molecules.物質是由什么構成的?原子和分子。
Matter is made of molecules, such as H20, which is the water molecule.?物質是由分子組成的，比如水分子H20。
Matter can be one of three states, solid, liquid or gas.?物質可以是三種狀態(tài)之一，固態(tài)、液態(tài)或氣態(tài)。
Water and ice are the same substance, but they are in different states.?水和冰是同一種物質，但它們處于不同的狀態(tài)。
These statesdependon the temperature of the molecules.?這些狀態(tài)取決于分子的溫度。
When we heat a substance, the molecules move faster and try to take up more space.?當我們加熱一種物質時，分子運動得更快，并試圖占據更多的空間。
When wecoola substance, the moleculesmove moreslowly.?當我們加熱一種物質時，分子運動得更快，并試圖占據更多的空間。
When we cool a substance to its freezing point, it becomes a solid.?當我們把一種物質冷卻到冰點時，它就變成固體。
What do the states of matter depend on? temperature物質的狀態(tài)依賴于什么?溫度
In a solid, the molecules move very little.?在固體中，分子幾乎不動。
Their positions are almost fixed.?它們的位置幾乎是固定的。
To be fixedmeansthat their positionsdon't change.被固定意味著他們的位置不會改變。
If we heat the molecules, they move faster and away from each other.?如果我們加熱分子，它們會運動得更快，彼此遠離。
The solid begins to melt, like ice cream on a hot day.?固體開始融化，就像熱天的冰淇淋。
How can we change a solid into a liquid? heat it up我們怎樣把固體變成液體?加熱
To?change a solid into a liquid, add heat.要把固體變成液體，加熱。
At a certain temperature, a solid begins to change into a?liquid.在一定的溫度下，固體開始變成液體。
The temperature at which a solid change sinto a liquid? depends on the substances.?固體變成液體的溫度取決于這些物質。
For water, the solid begins to change into a liquid when its temperature rises to above 0 degree Celsius.?對于水來說，當溫度上升到0攝氏度以上時，固體就開始變成液體。
For some substances, such as steel, the temperature at which it becomes a liquid is much higher.?對于某些物質，如鋼，它變成液體的溫度要高得多。
Steel often melts at around 1370?degrees Celsius.鋼通常在1370攝氏度左右熔化。
At what temperature does ice begin to melt? below 0?degrees Celsius冰在什么溫度開始融化?攝氏零度以下
what does the temperature at which substance begins to? melt depend on?the substance
At a certain temperature, a solid begins to change into a?liquid.在一定的溫度下，固體開始變成液體。
If we continue to heat a liquid, the molecules move even faster.?如果我們繼續(xù)加熱液體，分子運動得更快。
At a certain temperature, the liquid begins to change into a gas.在一定的溫度下，液體開始變成氣體。
For water, the liquid begins to change into a gas at 100 degrees Celsius.?對于水來說，液體在100攝氏度時開始變成氣體。
what happens if we continue to heat a liquid?molecules move even faster.
at a certain temperature,the liquid begins to change into a gas.
Inside a star,such as our Sun,the temperature is very high.
everything inside the Sun is a gas.
according to scientists,there are over 65 elements inside the Sun.
these include oxygen and iron.
over 90 percent of the Sun is hydrogen gas.
Test Results
Yesterday there was an important science test.?
昨天這有一個重要的科學測試
Lisa, Tom and 20 other classmates took the test.?
The test was about the states of matter and how they are different.?
There were 25 questions on the test, and they had 45 minutes to take it.?
what was the text about?It was about the states of matter.
how long do they have to take the test?45minutes.
There were 25 question on the test,and they had 45 minutes to take it.
Here are some of the test results.
Two students got perfect scores.?
The lowest score was 68 out of a hundred.?
The average score was 86.3.?
Eleven students scored higher than average.?
Eleven?students had below average scores.
what with the lowest score?68
how many students score below average?11 students scored less than 86.3.
eleven students scored higher than average.
Two students got perfect scores.?
Yesterday there was an important science test.?
Tom missed two questions on the test, so his score was 92.?
His score was the eighth highest in the class.?
Lisa missed two and a half questions, so her score was 90.?
Her score was the tenth highest score.?
how much higher was tom's scores than Lisa's.two points
how many students scored higer than tom?seven students
Her score was 4 points higher than the average score.?
Lisa was disappointed with her test results.?
She studied hard for the test, but she still didn’t do well.?
As a result, she plans to study harder for the next test.?
The next test will be in about two weeks.?
what she plan to do for the next text？she plans to study harder
lisa was?disappointed with her test results.?
She studied hard for the test, but she still didn’t do well.?
Tom was surprised and happy with his test results.?
He didn’t study hard, so his result was better than he expected.?
He was also happy that he did better than Lisa did.
tom scored two points?
Tom was surprised and happy with his test results.?
