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ale4655 [162]
4 years ago
15

How many significant figures are in the number 50.5

Chemistry
2 answers:
storchak [24]4 years ago
3 0
There are 3 significant figures in 50.5. Since the zero is not the first number digit, we start at 5. Thus there are 3 figures of value
luda_lava [24]4 years ago
3 0

Answer:

There are 3 significant numbers in the number 5.05

Explanation:

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How are waves reflected, absorbed, and transmitted through various materials<br>​
EastWind [94]

Answer:

Electromagnetic Radiation

Explanation:

When light shines on an object, it is reflected, absorbed, or transmitted through the object, depending on the object's material and the frequency (color) of the light. However, because light can travel through space, it cannot be a matter wave, like sound or water waves.

7 0
3 years ago
What mass of hcl gas must be added to 1.00 l of a buffer solution that contains [aceticacid]=2.0m and [acetate]=1.0m in order to
Paraphin [41]
PH of acidic buffer = pKa + log [CH₃COONa - HCl] / [CH₃COOH + HCl]
pKa of CH₃COOH = 4.74
Concentration of acetic acid in buffer = 2.0 M
Concentration of sodium acetate = 1.0 M
Concentration of HCl must add = x
pH = 4.74 + log (1-x) / (2+x) = 4.11
x = concentration of HCl must be added = 0.43 M
number of moles of HCl = M * V = 0.43 * 1 = 0.43 mol
mass of HCl must be added = 0.43 * 36.5 = 15.7 g
 
3 0
4 years ago
Give the following number of protons, neutrons, and electrons in the following isotope:
valina [46]

Answer:

47, 68, 47

Explanation:

Let's consider the following isotope: ¹¹⁵Ag.

If we look in the Periodic Table, the atomic number of Ag is 47, that is, silver has 47 protons.

Since ¹¹⁵Ag is neutral it must have the same number of protons that of electrons. Then, it also has 47 electrons.

The number 115 in ¹¹⁵Ag stands for the mass number, which is the sum of protons and neutrons. Then, the number of neutrons is:

p⁺ + n⁰ = 115

n⁰ = 115 - p⁺ = 115 - 47 = 68

The number of protons, neutrons, and electrons in ¹¹⁵Ag is: 47, 68, 47.

3 0
3 years ago
25 POINTS!
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3 years ago
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What happens to a liquids melting/freezing point and boiling point when you dissolve a substance in it
Inessa [10]
It either increases or decreases the melting/freezing point.
8 0
4 years ago
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