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Ivan
3 years ago
8

The purpose of controlling an experiment is to _____. A. double-check your own work B. compare one theory to another theory C. p

revent the question from being testable D. make sure the results of the experiment are useful
Chemistry
1 answer:
pantera1 [17]3 years ago
4 0

D

Make sure the results of the experiment are useful

Explanation:

In an experiment, certain variables (independent variables) are controlled to check how they affect other variables (dependent variables) and understand the relationship between them. Also, these experiments usually have a control experiment, of no change, to help compare results and increases their reliability.

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Hot, molten rock deep below Earth’s surface is called lava mantle rock parent rock magma
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Answer:

I think it is Magma

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Which one of the following is not a fossil fuel?
Finger [1]

The answer is C, Uranium.

Natural gas, coal, and oil are all naturally made from fossils. Uranium is an element which can be found on the Periodic Table of Elements.

5 0
3 years ago
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Write the chemical equation that represents the process of lattice energy for the case of nacl.
faust18 [17]

Answer: Na^+(g)+Cl^-(g)\rightarrow NaCl(s),\Delta H_{Lattice}=-786kJ/mol

Explanation:

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\Delta H_{Lattice}=positive , energy is absorbed while forming of the lattice

\Delta H_{Lattice}=negative, energy is release while forming of the lattice

Na^+(g)+Cl^-(g)\rightarrow NaCl(s),\Delta H_{Lattice}=-786kJ/mol

One mole of sodium ion when combines with one mole chloride ion release  786 kJ of energy.

4 0
3 years ago
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Can someone helps me
Lorico [155]

Answer:

Letter C is the correct one

6 0
3 years ago
Specify the number of protons, neutrons, and electrons in the neutral atom bromine-80.
jolli1 [7]
  80 equals the mass number. In the periodic table, the atomic number of Bromine is 35. The atomic number equals the number of protons.
  80-35= number of neutrons (mass-protons)
So, we have P=35   N=45
Furthermore, since the atom is neutral that must mean that the number of electrons equals the number of protons.
e=35
5 0
3 years ago
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