A mineral is formed with 12 parent and 2 daughter isotopes. How many of each iso
ID: 153025 • Letter: A
Question
A mineral is formed with 12 parent and 2 daughter isotopes. How many of each isotope should be found in the rock after one half-life?
3 parent and 11 daughter isotopes
6 parent and 6 daughter isotopes
8 parent and 6 daughter isotopes
6 parent and 8 daughter isotopes
Which of the following statements about the scientific method is true?
The scientific method can only prove things correct, it cannot prove things incorrect.
“It is a proven scientific fact” is an acceptable statement from a scientist.
Untestable hypotheses are acceptable within the scientific method.
Hypotheses and Theories are continually tested and evaluated by experiments.
What was the cause of the creation of the Earth’s moon?
the moon was a large asteroid that was captured by Earth’s gravity
the moon separated from Earth after a collision with a large asteroid about 4.5 billion years ago
the moon was placed into Earth’s orbit by little green space aliens
the moon formed as a result of an exceedingly large volcanic eruption
a.3 parent and 11 daughter isotopes
b.6 parent and 6 daughter isotopes
c.8 parent and 6 daughter isotopes
d.6 parent and 8 daughter isotopes
Explanation / Answer
1) A mineral is formed with 12 parent and 2 daughter isotopes. How many of each isotope should be found in the rock after one half-life?
ANSWER IS: d. 6 parent and 8 daughter isotopes
EXPLANATION:
Half-life is amount of time it takes for 50% of radioactive parent will decay to stable product.
50% of parent decays to stable product, with each successive half-life.
As in question, we have to find isotope after one half-life. So after one half-life, 50% of the parent atoms will become daughter products. And 2 daughter isotopes are given.
One half-life is 50% of parent: 50% daughter, which has1:1
A mineral is formed with 12 parent and 2 daughter isotopes. So 50% of 12 is 6, thus . 6 parent; 6+2 =8 , 8 daughter isotopes...
2) Which of the following statements about the scientific method is true?
ANSWER IS: d. Hypotheses and Theories are continually tested and evaluated by experiments.
EXPLANATION:
a. The scientific method can only prove things correct, it cannot prove things incorrect : There is no scientific method that can only prove things correct. How can it will not prove things incorrect? So this is incorrect.
b. “It is a proven scientific fact” is an acceptable statement from a scientist : Research means search again and again, so again and again prove. Therefore, this is also incorrect.
c. Untestable hypotheses are acceptable within the scientific method : Hypothesis which is untestable, how can be it acceptable scientific method.
d. Hypotheses and Theories are continually tested and evaluated by experiments : Earlier also I explained that research means search again and again. So Hypotheses and Theories are continually means search again and again tested and evaluated by experiments. " Re" word in " Research " is again and again.
3) What was the cause of the creation of the Earth’s moon?
ANSWER IS: b. the moon separated from Earth after a collision with a large asteroid about 4.5 billion years ago.
EXPLANATION:
Giant impact hypothesis states that the moon was formed about 4.5 billion years ago, when a planet-like object or asteroid collide with earth.
Then the moon separated from Earth after a collision with a large asteroid. So moon seems to be made of material that looks like as Earth’s mantle, as proved by rock samples and mineral maps....
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