Chemistry, 28.05.2021 04:00 hfleysher

When 200. mL of 2.0 M NaOH(aq ) is added to 500. mL of 1.0 M HCl(aq ), the pH of the resulting mixture is closest to

Answers: 3

Show answers

Answers

Answer from: Quest

1. 1 mole of anything contains 6.022x10^23 pieces

2. a

3. c, number

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br

molar mass = grams / number of moles = g/mole

to find moles = g / molar mass

to find mass = g = molar mass / moles

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

Answer from: Quest

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

Another question on Chemistry

Chemistry, 22.06.2019 04:00

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

Answers: 2

Answer

Chemistry, 22.06.2019 05:00

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Answers: 1

Answer

Chemistry, 22.06.2019 08:00

What is the standard unit of measure for acceleration?

Answers: 1

Answer

Chemistry, 22.06.2019 10:30

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Answers: 2

Answer

You know the right answer?

When 200. mL of 2.0 M NaOH(aq ) is added to 500. mL of 1.0 M HCl(aq ), the pH of the resulting mixtu...

Questions