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Question 1 of 10
1. Question
By evaluating X, balance the given chemical equation
2H2+ X → 2H2OCorrect
Atoms are not recovered or destroyed when balancing a chemical equation, but instead, they change positions.
Incorrect
Atoms are not recovered or destroyed when balancing a chemical equation, but instead, they change positions.
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Question 2 of 10
2. Question
Which of the following best illustrates the theory that molecules are continuously in movement?
Correct
If the gas is in a corner of the room, they were published. The gas would soon disperse across the room as its molecules were uniformly dispersed distributed
Incorrect
If the gas is in a corner of the room, they were published. The gas would soon disperse across the room as its molecules were uniformly dispersed distributed
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Question 3 of 10
3. Question
Which of the following solutions would turn red on litmus paper?
Correct
When immersed in an acid, Litmus paper changes colour to red and when immersed in an acid, to blue the Basis.
Incorrect
When immersed in an acid, Litmus paper changes colour to red and when immersed in an acid, to blue the Basis.
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Question 4 of 10
4. Question
Immaculate nitrogen is gotten commercially by to begin with liquefying discuss, which is 78 percent nitrogen. Which of the following is the most excellent strategy to condense air to a fluid?
Correct
By changing temperature or pressure, or by changing temperature or pressure, the liquefaction of air may be achieved. A gas may be converted to a liquid by lowering the temperature.
Incorrect
By changing temperature or pressure, or by changing temperature or pressure, the liquefaction of air may be achieved. A gas may be converted to a liquid by lowering the temperature.
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Question 5 of 10
5. Question
In the periodic table of the elements shown above, an element’s nuclear number demonstrates the number of?
Correct
An element’s atomic number is the number of protons of that element’s component. No two elements have an atomic number that is the same. The elements in the periodic table are organized in order to increase the number of atoms
Incorrect
An element’s atomic number is the number of protons of that element’s component. No two elements have an atomic number that is the same. The elements in the periodic table are organized in order to increase the number of atoms
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Question 6 of 10
6. Question
The majority of the components in the periodic table are
Correct
Metals represent the vast majority of the elements in the periodic table. A broad range of chemical and physical properties are shown by metals.
Incorrect
Metals represent the vast majority of the elements in the periodic table. A broad range of chemical and physical properties are shown by metals.
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Question 7 of 10
7. Question
Which of the elements below has the most comparable chemical properties?
Correct
It is likely that elements in the same group or column will have the same chemical properties,the number of electrons in their outermost shell is based largely.
Incorrect
It is likely that elements in the same group or column will have the same chemical properties,the number of electrons in their outermost shell is based largely.
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Question 8 of 10
8. Question
The sun converts electromagnetic energy and thermal energy into nuclear energy. When solar energy reaches the earth, which of the following is the best example of a change from thermal energy to chemical energy?
Correct
Through photosynthesis, plants convert solar energy into chemical energy. The energy in substances is thermal energy or heat energy. In the bonds of atoms and molecules, chemical energy is stored.
Incorrect
Through photosynthesis, plants convert solar energy into chemical energy. The energy in substances is thermal energy or heat energy. In the bonds of atoms and molecules, chemical energy is stored.
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Question 9 of 10
9. Question
Which statement better describes the example that follows Since a car is driven for a long period of time at high speeds, A temporary rise in the size of the tires?
Correct
The size, or volume, of the tires increases because heat is generated by the friction between the tires and the road.
Incorrect
The size, or volume, of the tires increases because heat is generated by the friction between the tires and the road.
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Question 10 of 10
10. Question
A nuclear reactor powering an electrical power plant depends on:
Correct
All atomic reactors in utilize nowadays get their vitality through atomic parting, which releases vitality when an overwhelming core parts into littler parts.
Incorrect
All atomic reactors in utilize nowadays get their vitality through atomic parting, which releases vitality when an overwhelming core parts into littler parts.