Answer:
0.254 M
Explanation:
The molarity is given by the formula M: Number of Moles/ Vol (L)
Number of Moles : 100 g/342.28 g/mol = 0.292 moles
M: 0.292 moles/ 1.15 L = 0.254 M to three significant figures
Scientist use models to study atoms because you cannot either see or perceive directly what do atoms look like.
Models permit to explain in a simplified way how the atoms are constituted, and, so, figure out how they behave and how they are the bulding blocks of the matter (elements and compounds).
A model can be a drawing or structure with balls and sticks, which show in an idealized way what an atom is.
Since the scientists have discovered different facts about the atoms along the last 200 years the models of the atoms have also evolved.
The plum pudding model of the atom proposed by JJ Thompson was different of the nuclear model proposed by Rutherford, and Rutherford's was different from the planetary model proposed by Bohr, and this is different from the quantum model.
Many insulating materials contain spaces filled with air because ; Air is a poor conductor of heat and electricity
Insulators are materials that do not allow the easy passage of heat or electricity through them. they are used to protect users from direct exposure to electricity and heat and also for the protection of equipment's at home and at work places.
Insulators are generally bad conductors of heat and electricity. some examples of insulators are ;
They are all very good insulators. but the most commonly used insulator in electrical installations is Porcelain
Hence we can conclude that many insulating materials contain spaces filled with air because Air is a poor conductor of heat and electricity.
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Answer:
45.45 ml of dimethyl sulfoxide
Explanation:
density of dimethyl sulfoxide is 1.10 g/10⁻³L which is 1.10 g/mL
now we devise the next reasoning:
If 1.10 g of dimethyl sulfoxide have a volume of 1 mL
Then 50 g of dimethyl sulfoxide have a volume of X mL
X = (50 × 1) / 1.10 = 45.45 ml of dimethyl sulfoxide
To calculate the volume of dimethyl sulfoxide needed, you must divide the mass by the density. With the given values, the resulting volume is approximately 45.45 L.
The subject of this question relates to the concept of density, which is directly related to mass and volume. We can apply the formula Density = Mass / Volume, hence Volume = Mass / Density. The mass provided in the question is 50.0 g and the density of dimethyl sulfoxide is given as 1.10 g×10^-3. Plugging in these values into the Volume equation gives us Volume = 50.0 g / 1.10 g×10^-3, which equals ~45,454.55 mL or approximately 45.45 L.
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Answer:
Rb
Explanation:
Alkali metals are in group 1 (the first column on the periodic table) including Li, Na, K, etc.
B. From a liquid to gas
C. From solid to liquid
D. From a gas to plasma
Answer:
is the letter A. from gas to a liquid