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morpeh [17]
3 years ago
7

Some baker of sourdough and a few other types of bread have what they call “starter dough”. This dough contains yeast from which

they make all their bread. Some starter dough is more than 100 years old. The dough has to be “fed” more flour and water on a regular basis for it to remain usable. Why must the starter dough be “fed”?
Chemistry
1 answer:
andre [41]3 years ago
5 0


Fresh sourdough starter is a wonderful resource. Bread, pancakes, waffles, cake… there are so many delicious directions you can take with sourdough. The key: maintaining your sourdough starter so that it’s healthy, happy, and ready to go when you are almost there! Once you’ve successfully created your starter, you’ll need to feed it regularly. If you bake a lot of sourdough treats, you may want to keep it on your counter, at room temperature. While this means feeding it twice a day, it also means your starter will be ready to bake with at the drop of a hat! However, many of us don’t want the commitment of twice-a-day feedings. If you’re a more casual sourdough baker, it’s possible to store your starter in the refrigerator, feeding it just once a week.

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How many atoms are there in each of the following substances?
juin [17]

To know the number of atoms, it will be necessary to use the formula of avogadro. We calculate the number of moles then we can calculate the number of avogadro.

The molar mass of:

Phosphorus = 31g / mol

Mercury = 200 g / mol

Bismuth = 209 g / mol

Strontium = 87 g / mol.

The number of avogadro (N) is 6.023 10 ^ 23

n = m (mass) / M  (molar mass)

number of atoms = n. N = m / M  . N

number of phosphorus atoms = 5.14/31 . 6.023 10^23 = 9.98 10 ^ 22 atoms

Number of atoms of mercury = 2.16/200 . 6.023 10^23 = 6.5 10 ^ 21 atoms

Number of bismuth atoms = 1.8/209 . 6.023 10^23 = 5.18 10 ^ 21 atoms

Number of strontium atoms = 8.8 x 10-2 /87 . 6.023 10^23 = 6.09 10 ^ 20 atoms

3 0
3 years ago
LOSPICNOMEWTROS SON INSTRUMENTOS EMPLEADOS PARA CALCULAR DENSIDADES DE SUSTANCIAS LIQUIDAS. SE REALIZO UN EXPERIMENTO PARA DETER
Natasha_Volkova [10]

Answer:

0.66g/mL

Explanation:

La densidad es una propiedad de la materia definida como la masa de una sustancia en un determinado volumen.

En este problema, podemos hallar la densidad sabiendo que la diferencia de masas del pic vacío y el pic lleno es la masa de la solución y que el volumen que ocupa es de 25mL:

<em>Masa solución:</em>

25g - 8.5g = 16.5g

Así, la densidad será:

16.5g / 25mL =

<h3>0.66g/mL</h3>
3 0
3 years ago
Examine the following equations.
Zigmanuir [339]

Answer:

A and B

Explanation:

This is because there was emission of gamma (Y) radiations in both the reactions.

8 0
3 years ago
In which one of the following pairs do the two species resemble each other most closely in chemical properties: (a) 1H1 and 1H1+
Delvig [45]

Answer:

c.        ₆¹²C   and   ₆¹³C

Explanation:

Properly writing the given options:

  a.   ₁¹H    and    ₁¹H⁺

  b.    ₇¹⁴N    and    ₇¹⁴N³⁻

  c.     ₆¹²C   and   ₆¹³C

Electrons are the crux of chemical reactions. These negatively charged subatomic particles determines chemical properties of atoms and how they combine with other atoms.

Atoms having the same number of electrons especially in their valence shells shares similar chemical properties.

From the problem above, we have been given some information about the atom.

The mass number is given by the superscript before the symbol of the atom and it signifies the sum of the number of protons and neutrons in the atom.

The atomic number is shown by the subscript and it denotes the number of protons in the atom.

For neutral atoms that has not lost or gained any additional electron, the atomic number is the same as the number of electrons.  

The superscript after the atom is the charge on the particle. It represents the number of electrons lost or gained by the atom.

In {c.  ₆¹²C   and   ₆¹³C}, the atom is in a neutral state. Here the atomic number which is 6 is the number of protons in the atom. This is also the number of electrons in the atom. Therefore, the two atoms would have similar chemical properties and behavior.

This is not so for the others as their number electrons are different.

8 0
4 years ago
Which domain do you find the most interesting why
Sloan [31]
What kind of domain?
8 0
3 years ago
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