Explanation:
Density = mass/volume
1. Work out the density of ethanol and benzene
Ethanol - mass = 3.9 g and volume = 5 mL
Density = mass/volume =3.9/5=0.78g/mL
Benzene - mass=4.4g and volume = 5 mL
Density = mass/volume = 4.4/5=0.88g/mL
So Benzene is more dense
2. Density=mass/volume=25/7-2=5g/mL
The reason why the volume of the object is 7mL - 2mL is because the amount of displaced water is the volume of the object
3. For the Bohr Model, google the image of it.
Protons are positive charged
Neutrons are neutral
Electrons are negative charged
4. Main difference is the location of the electron in the atom.
Bohr Model : electrons orbits the nucleus in fixed paths
Electron cloud model: only the electron's probable location is determined
Answer:
a. Molarity=
b. Molality=
Explanation:
Hello,
In this case, given the information about the aniline, whose molar mass is 93g/mol, one could assume the volume of the solution is just 200 mL (0.200 L) as no volume change is observed when mixing, therefore, the molarity results:
Moreover, the molality:
Best regards.
Answer:
C. Symbol
Explanation:
The letters CU is a chemical symbol used to identify the said metal.
Elements are distinct substances that cannot be split up into simpler substances. Such substances consists of only one kind of atom. The numbers of elements know till date exceeds hundred. Every matter is a combination these various elements.
In the world of science, each of the element is symbolized by a capital letter or capital letter followed by a small letter usually derived from their Greek, Latin or English names.
For copper, it is derived from a latin word Cuprum and its symbol is Cu.
PH scale is from 1 to 14 and indicates how acidic or basic a solution is. To find pH or pOH we need to know the H⁺ ion concentration or OH⁻ concentration.
pH can be calculated using the following equation;
pH = -log[H⁺]
the H⁺ concentration of the given acid is 1.0 x 10⁻⁴ M. substituting this we can find the pH
pH = -log[1x10⁻⁴]
pH = 4
answer is 1) 4
It takes <u><em>about a month</em></u> for the Moon to complete one revolution around the earth. It is much longer than 60 hours and much shorter than 365 days. <u><em>So the correct answer is C. 29.5 days. I think you made a typo, because the correct answer is 29.5 days not years.</em></u>