3 years ago

Stephan claims that Earth has both a gravitational field and a magnetic field. Which statement best supports his claim?

Chemistry

1 answer:

Bess [88]3 years ago

5 0

Answer:

Explanation:

Without gravity, any object wont go to the ground, and without a magnetic field, a compass cant be used for navigation.

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What is the pH of a Koh solution that has [H+]=1.87×10^-13M

xenn [34]

PH=-log[H⁺]
pH=-log(1.87×10⁻¹³)
pH=12.72

I hope this helps. Let me know if anything is unclear.

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3 years ago

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A scientist makes several observations, develops a question, researches what is known about the question, forms a hypothesis, an

Alex73 [517]

The scientist should make a new hypothesis and do a new experiment! That is what I say!

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3 years ago

What volume in milliliters of 1.420 M sulfuric acid is needed to neutralize 3.209 g of aluminum hydroxide 3 H 2 SO 4 (aq)+2 Al(O

nadya68 [22]

Answer:

$V=43.46mL$

Explanation:

Hello!

In this case, since the reaction between sulfuric acid and aluminum hydroxide is:

$3H_2SO_4+2Al(OH)_3\rightarrow Al_2(SO_4)_3+6H_2O$

Whereas the ratio of sulfuric acid to aluminum hydroxide is 3:2; thus, we first compute the moles of sulfuric acid that complete react with 3.209 g of aluminum hydroxide:

$n_{H_2SO_4}=3.209gAl(OH)_3*\frac{1molAl(OH)_3}{78.00gAl(OH)_3} *\frac{3molH_2SO_4}{2molAl(OH)_3} \\\\n_{H_2SO_4}=0.0617molH_2SO_4$

Then, given the molarity, it is possible to obtain the milliliters as follows:

$V=\frac{n}{M}=\frac{0.0617mol}{1.420mol/L}*\frac{1000mL}{1L}\\\\V=43.46mL$

Best regards!

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2 years ago

How many sig figs are in 340.0 mL

lyudmila [28]

Answer:

Explanation:

there is a decimal place present. so you would take away any zeros before the number.

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3 years ago

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How many grams of h2 are needed to react with 48 grams of o2, given the reaction: 2 h2 (g) + o2 (g) --> 2 h2o (l)?

photoshop1234 [79]

1.Calculate the number of mole of O2: 48/32=1.5 mol
2.Calculate the number of mole of H2 by mole ratio: 1.5 x 1/2=0.75 mol
3.Calculate the answer:
0.75 x 2=1.5g

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3 years ago