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Liula [17]
4 years ago
14

A scientist is trying to determine whether a certain substance is radioactive. Which question would be most helpful to ask?

Chemistry
1 answer:
oksian1 [2.3K]4 years ago
3 0
Well a question to ask would be if the mass of the material has changed significantly as that would determine that the substance is radioactive or if there have been any high readings found by a Geiger meter in certain period of time

hope that helps 
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Why is basalt a sign that the moon once had magma at its surface<br>14 points
lawyer [7]

The basalt is a sign that the Moon once had magma at its surface because the basalt is a type of rock that forms directly from the cooling off of the magma. The basalt is part of the igneous type of rocks, which are the type of rocks that form from the cooling of the magma, be it on the surface or inside the ground, so having basalt on the Moon is a sure sign that our natural satellite once had magma on it.

7 0
4 years ago
The distance from the surface of the earth to the moon is approximately 3.8 * 10 to the 5th km. How many days would a distance l
Alla [95]

Answer:

82 days would take a distance like that, if we drive at 120 mi/h

Explanation:

Distance from Earth to moon is 3.8×10⁵ km

You drive at a speed of 120 mi/h

Let's convert the 120 mi/h to km/h

1 mi = 1.61 km

Then 120 mi . 1.61 km / 1mi = 193.2 km

New velocity is 193.2 km. Therefore,

193.2 km are driven in 1 hour

3.8×10⁵ km woul be driven in (3.8×10⁵ . 1)/ 193.2 = 1966.8 hours

1967 hours . 1 day / 24 hours = 82 days

5 0
4 years ago
What is the molar mass of Au2S
OlgaM077 [116]

Au2S is =<u><em> 426 g/mol</em></u> for molar mass

8 0
4 years ago
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What is the name of the test used to find out the gas produced when calcium reacts with sulfuric acid? *
lys-0071 [83]

Explanation:

Litmus paper is your answer

please mark as brilliant

5 0
3 years ago
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Explain how a seismometer works
Radda [10]
<span>will record an earthquake by a plotting vibrations versus time. 
can determine the time of arrival of the first P-wave and the time of arrival of the first S-wave.</span>
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3 years ago
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