Porphyry is an igneous rock that contains giant crystals surrounded by smaller crystals.
One of the most common types of rocks is an igneous rock, which is created when molten material solidifies either below or above the Earth's surface. The Latin word "ignis," which meaning fire, is where the term "igneous" gets its name. These rocks were created by the molten magma, which is a mixture of different minerals, gases, and liquids. Igneous rocks are created when magma that has risen from below the Earth's crust cools. There are two different types of igneous rocks produced by this process: intrusive and extrusive. This process can be either slow or rapid. Porphyry is an igneous rock that contains giant crystals surrounded by smaller crystals.
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Calcium is very reactive, has properties similar to magnesium, and is in the same period as bromine.
Properties are defined as the qualities that help us distinguish one material from another.
There are basically two types of properties.
Reactive is defined as the catalyst for a chemical process, either on its own or in combination with other materials.
It can also be defined as the propensity of a substance to undergo chemical reaction and release energy, either by itself or in conjunction with other materials.
Thus, calcium is very reactive, has properties similar to magnesium, and is in the same period as bromine.
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B. mass
C. length
D. electric current
Length a physical quantity will be measured in meters, therefore option (c) is correct.
A physical quantity can be defined as the characteristic property of a system that is generally quantified in terms of measurement.
Length , a physical quantity -
The physical quantity associated with length can be written as x meter, where x is the numerical value, and the meter specifies the unit .
Meter is represented by m. It is the fundamental unit of length.
Initially, One meter was defined as a quantity that is 1650763.73 times the wavelength of the light emitted in a vacuum .
Length a physical quantity will be measured in meters ,hence option (c) is correct.
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Answer:
= 25 g
Explanation:
Using the formula;
A = A₀ (1/2)^(t/h)
where A is the final amount,
A₀ is the initial amount of the substance,
t is the time and
h is the half-life of the substance,
In this case; the half life of U-238 h is equal to 4.47 billion years.
A = A₀ (1/2)^(t/h)
A = 50 (1/2)^(4.5 / 4.47)
= 24.88
= 25 g
Answer:
C) 25 grams
Explanation:
25 grams would remain after one half-life (4.5 billion years). Find the point where percent remaining is 50% and that will tell you it is one half-life.