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2 years ago

What is a scanning tunneling microscope?

Chemistry

1 answer:

Crank2 years ago

7 0

A. Used for imaging surfaces at atomic level

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What goes in the blank?

Anon25 [30]

Protons goes in the blank. the word can be used for both.

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3 years ago

Three samples of the same metal are weighed and their masses are found to be 44.40 g, 40.58 g, and 38.35 g. The corresponding vo

lidiya [134]

The density of a material is the mass of the material per unit volume. Here the weight of the same metal is 44.40g, 40.58g and 38.35g having volume 4.8 mL, 4.7 mL and 4.2 mL respectively. Thus the density of the metal as per the given data are, $\frac{44.40}{4.8}$ = 9.25g/mL, $\frac{40.58}{4.7}$ = 8.634g/mL and $\frac{38.35}{4.2}$ = 9.130g/mL respectively.

The equation of the standard deviation is √{∑(x - $\frac{}{x}$ )÷N}

Now the mean of the density is {(9.25 + 8.634 + 9.130)/3} = 9.004 g/mL.

The difference of the density of the 1st metal sample (9.25-9.004) = 0.246 g/mL. Squaring the value = 0.060.

The difference of the density of the 2nd metal sample (9.004-8.634) =0.37 g/mL. Squaring the value = 0.136.

The difference of the density of the 3rd metal sample (9.130-9.004) = 0.126 g/mL. Squaring the value 0.015.

The total value of the squared digits = (0.060 + 0.136 + 0.015) = 0.211. By dividing the digit by 3 we get, 0.070. The standard deviation will be $\sqrt{0.070}=0.265$ . Thus the standard deviation of the density value is 0.265g/mL.

5 0

2 years ago

Can anyone help me with this since it is a quiz and I am really bad at chemistry!!

lord [1]

Answer:

Down below <3

Explanation:

1. 1 $N_{2}$ + 3 $H_{2}$ ---> 2 $NH_{3}$

2. 2 $KClO_{3}$ ---> 2 KCl + 3 $O_{2}$

3. 1 $Na_{3}PO_{4}$ + 3 HCl ---> _ 3_ NaCl + 1 $H_{3}PO_{4}$

4. 1 $C_{2}H_{6}O$ + 3 $O_{2}$ ---> 2 $CO_{2}$ + 3 $H_{2}O$

5 0

3 years ago

What is an element that has more valence electrons than fluorine and less energy levels than sodium?

Radda [10]

From the periodic chart the only element between F and Na is Neon. Neon has one more valence electron 8 than fluorine 7, and is one energy level shy of Na.

5 0

2 years ago

How does wind cause surface currents?

liberstina [14]

THIS IS C. I HOPE THIS HELPS YOU

6 0

3 years ago

Read 2 more answers