HELP PLEASE

The

scZoUnD [109]

Answer:

1. Richter

2. moment

Explanation:

I just submitted it on edge! Try it out for yourself bc I promise this is 100 percent correct! Have a great day

6 0

3 years ago

Read 2 more answers

Hydrogen bonds are approximately _____% of the bond strength of covalent c-c or c-h bonds.

Lelu [443]

Hydrogen bonds are approximately 5% of the bond strength of covalent C-C or C-H bonds.
Hydrogen bonds strength in water is approximately 20 kJ/mol, strenght of carbon-carbon bond is approximately 350 kJ/mol and strengh of carbon-hydrogen bond is approximately 340 kJ/mol.
20 kJ/350 kJ = 0,057 = 5,7 %.

4 0

3 years ago

Calculate the volume in milliliters of a 0.51M barium chloride solution that contains 75.0mmol of barium chloride BaCl2. Be sure

rjkz [21]

Answer:

0.15 L= 150 ml

Explanation:

barium choride = BaCl₂

0.51 M = 0.51 mol BaCl₂/ 1 L solution

1 mol is equal to 1000 times a mmol:

0.51 mol = 0.51 x 10³ mmol= 510 mmol

As you know that the solution has 510 mmol BaCl₂ per liter, you can use the following simple calculation to obtain the volume in which there are 75 mmol BaCl₂:

510 mmol BaCl₂ ------ 1 L

75 mmol BaCl₂--------- X

X= $\frac{75 mmol x 1 L}{510 mmol}$ = 0.147 L ≈ 0.15 L

8 0

3 years ago

Chemistry!! Help please!!

Flura [38]

1. The conjugate acid-base pairs are HCl/Cl- and NH3/NH4+. They can be changed into one another by proton transfer.

2. The acid in the reaction is the molecule that has the lowest pKa value or (simply) gives their proton away the easiest. The pKa of HCl is around 3 I think while ammonia’s is around 35. This means HCl is the acid here. In the other reaction (backwards) you can see that NH4+ gives a proton to the chloride ion. To give a proton = acid. So the acids are HCl and NH4+ and the bases are NH3 and Cl-.

An important rule is: The stronger the acid/base, the weaker its conjugate base/acid.

4 0

4 years ago

Which statement about subatomic particles is true?

Kruka [31]

The correct statement about subatomic particles is Electrons are the subatomic particles with the smallest mass.

The mass of protons and neutrons which are considered as 1 unit of mass of atoms is approximately 1836 times the mass of the electron

$\boxed {\boxed {\bold {Further ~ explanation}}}$

Atoms are composed of 3 types of basic particles namely protons, electrons, and neutrons

The mass of this basic particle is expressed in units of atomic mass

This atomic unit uses the standard atomic mass, that is, the C-12 isotope

1 atom C-12 = 12 atomic mass units

1 atomic mass unit = 1/12 x mass 1 C-12 atom

1 unit of atomic mass = 1.66.10⁻²⁴

the mass of each basic particle in atomic mass units is:

electron mass = 9.11.10⁻²⁸

proton mass = 1.6726.10⁻²⁴

neutron mass = 1,675.10⁻²⁴

The proton mass is considered to be equal to 1 atomic mass unit and a neutron which is also considered to be equal to 1 atomic mass unit

The charge of 1 proton is equal to a charge of 1 electron but has a different sign

The proton is positively charged (+1), the electron is negatively charged (-1). and neutrons not charged (neutral)

For a charge of 1 electron = e = 1.66.10⁻¹⁹ coulomb

Whereas the neutron charge = 0

Let's look at the answer choices

1. Protons are the only subatomic particles to have a charge.

This statement is wrong because in the nucleus there are electrons charged -

2. Electrons are the subatomic particles with the smallest mass.

The statement is true because the mass of protons and neutrons which are considered as 1 unit of mass of atoms is approximately 1836 times the mass of the electron

3. Neutrons orbit the nucleus of the atom.

This statement is wrong.

It can be explained by the Bohr atomic model, where electrons circulate the nucleus on a particular path so that electrons are not attracted to the nucleus.