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grandymaker [24]
4 years ago
14

Scientists often investigate alternative explanations for the data and observations presented, even once a hypothesis has been t

ested and supported through an experiment. This investigation of alternative explanations 1. proves that scientific theories are not able to be disproven. 2. demonstrates that scientific theories are based on opinions. 3. strengthens the evidence and support for a scientific theory. 4. keeps the scientific community competitive and motivated.
Chemistry
1 answer:
worty [1.4K]4 years ago
8 0

Answer:

Explanation:

its 2

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A rock with a mass of 70 grams is dropped into a graduated cylinder with 30 mL of water in it. The water level rose to 35 mL cal
Scilla [17]

Answer:

14

Explanation:

70g/(35mL-30mL)=14g/mL

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3 years ago
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Answer: last one

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3 years ago
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marshall27 [118]

Answers:

<u>Option B. 4.</u>

Explanation:

The visible spectrum of light emitted by a sample of active or excited hydrogen atoms splits into four wavelengths that are basically four distinct levels of energy in the visible region of the spectrum. There four different wavelengths are 410 nm, 434 nm, 486 nm, and 656 nm. These show for colors according to the spectrum and wavelength violet, blue, green, and red, where 656 nm wavelength is most intense on the spectrum.

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3 years ago
Trisha and her lab partner filled a beaker with 150 milliliters of a 0.10 M HCl solution. How many moles of HCl are in the beake
oksian1 [2.3K]
M=mol/liter
We know that we have 150ml=.15 L and .1 mol of HCl
Rearranging the molarity equation, we get
mol=M*l
mol=(.15)(.1)
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7 0
3 years ago
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Alkali metals react with water to produces what product?
atroni [7]

Answer:

  • <em>Alkali metals react with water to produce </em><u>hydroxide and hydrogen gas</u><u>.</u>

Explanation:

That is a chemical property of <em>alkali metals</em>: they are highly reactive and <em>react </em>vigorously <em>with water</em> to produce the correspondant hydroxide and hydrogen gas.

These are some of those reactions:

  • 2Li (s) + 2H₂O (l)  → 2LiOH (aq) + H₂(g) ↑

  • 2Na (s) + 2H₂O (l)  → 2NaOH (aq) + H₂(g) ↑

  • 2K (s) + 2H₂O (l)  → 2KOH (aq) + H₂(g) ↑

The alkali metals are the elements of group 1 of the periodic table: Li, Na, K, Rb, Cs, and Fr. They have one valence electron which may lose easily to form an ion with charge +1.

7 0
3 years ago
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