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almond37 [142]
3 years ago
11

Claire decided to find out which wildflowers are most abundant near roadsides in her community. Which of the following would BES

T help Claire with her investigation?
Group of answer choices

conducting a controlled experiment

using a computer model

observation

making a model
Chemistry
2 answers:
Fittoniya [83]3 years ago
6 0

Answer:

observation

Explanation:

ruslelena [56]3 years ago
3 0

Answer:

observation

Explanation:

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Sublimation is snow or ice changing to a gas without melting. What must happen to the molecules for this to happen?
expeople1 [14]

Answer:Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage. For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water.

Explanation:

6 0
2 years ago
14. What is the actual temperature 3000 km below the surface of the Earth?
Alexus [3.1K]

Answer:

temperature 3000 km below the surface of earth is varied, it's harder to know the actual temperature, it can be found around 3,000 - 3,500 degrees Celsius

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3 years ago
HELP ASAP 30 POINTS
allsm [11]

Answer:

Explanation:

Dind out

5 0
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What will happen wen lead react with copper 2 sulfate​
dezoksy [38]

Answer:This is what's known as a metal displacement reaction: the lead substitutes for the copper and ends up precipitating out of solution as insoluble lead (II) sulfate. ... The weight of copper deposited was 15.86gm.

Explanation:

4 0
3 years ago
The element lanthanum has two stable isotopes, lanthanum-138 with an atomic mass of 137.9 AMU and lanthanum-139 with an atomic m
dmitriy555 [2]

Answer:

A. there is an isotope of lanthanum with an atomic mass of 138.9

Explanation:

By knowing the different atomic masses of both Lanthanum atoms, we can not tell anything about their occurence in nature. Therefore, all the last three options are incorrect. Because, the atomic mass does not tell anything about the availability or natural abundance of an element.

Now, the isotopes of an element are those elements, which have same number of electrons and protons as the original element, but different number of neutrons. Therefore, they have same atomic number but, different atomic weight or atomic masses.

Hence, by looking at an elements having same atomic number, but different atomic masses, we can identify them as isotopes.

Thus, the correct option is:

<u>A. there is an isotope of lanthanum with an atomic mass of 138.9.</u>

7 0
3 years ago
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