Answer: 0.33 moles
Explanation:
Given that,
Amount of moles of Na2CO3 (n) = ?
Mass of Na2CO3 in grams = 35g
For molar mass of Na2CO3, use the molar masses as follows:
Sodium, Na = 23g;
Carbon, C= 12g
Oxygen, O = 16g
Na2CO3 = (23g x 2) + 12g + (16g x 3g)
= 46g + 12g + 48g
= 106g/mol
Since, n = mass in grams / molar mass
n = 35g / 106g/mol
n = 0.33mole
Thus, 0.33 moles of Na2Co3 is needed to produce 35g of Na2Co3
Answer:
To check if it's properly cleaned.
Explanation:
When you finish using a microscope, you have to take out all your samples you were using and make sure it is completely clean so that no further contamination affects future sample analysis.
Also when you begin to use it, make sure it is clean so that when you analyze your sample(s) are free from other unexpected agents.
The speed of the neutrino be in scientific notation (m/s) is given as: 2.99338 × 10⁹ m/s.
<h3>What is scientific notation?</h3>
Scientific notation is a method of writing, or of displaying real numbers as a decimal number between 1 and 10 followed by an integer power of 10.
The scientific notation is an alternative format of such a decimal number immediately followed by E and an integer. For example; the number 0.00236 can be written in scientific notation as 2.36×10−3 or as 2.36E-3.
According to this question, experiments at the ICARUS particle accelerator found neutrinos traveling at nearly light speed at 299338000 m/s.
This means that the speed of the neutrino be in scientific notation (m/s) is given as: 2.99338 × 10⁹ m/s.
Learn more about scientific notation at: brainly.com/question/18073768
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Answer:
The glow stick in hot water will be brighter
Explanation:
The glow stick in hot water will be brighter than the glow stick in cold water because the heat from the hot water will cause the molecules in the glow stick to move faster. The faster the molecules move in the glow stick, the sooner and brighter the reaction will be. The cold water will cause molecules to move slowly and it will take longer for the reaction to occur, which will also make it less bright.
Answer:
1. frequency = 7.39 * 10¹⁴ Hz
2. wavelength = 1.44 * 10⁸ nm
Explanation:
The speed, frequency and wavelength of waves are related by the formula;
speed = wavelength * frequency
1. wavelength of light = 406 nm = 4.06 * 10⁻⁷ m
speed of light is a constant = 3.0 * 10⁸ m/s
From the formula above, frequency = speed / wavelength
therefore, frequency = (3.0 * 10⁸ m/s) / 4.06 * 10⁻⁷ m
frequency = 7.39 * 10¹⁴ Hz
2. From the equation above, wavelength = speed/frequency
speed of radiation = 3.0 * 10⁸ m/s
frequency = 2.09 * 10⁹ Hz or 2.09 * 10⁹ s⁻¹
therefore, wavelength = (3.0 * 10⁸ m/s) / 2.09 * 10⁹ s⁻¹
wavelength = 1.44 * 10⁸ nm