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ivanzaharov [21]
3 years ago
9

The digestive system is a group of organs working together to...

Chemistry
1 answer:
Alex3 years ago
6 0
The digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body. Food passes through a long tube inside the body known as the alimentary canal or the gastrointestinal tract
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Water is placed into a sealed jar and has a mass of 22.0 grams. The jar is placed in the freezer and the water turns to ice. The
Serhud [2]

exactly 22.0 grams

because freezing is a physical change not a chemicl change..so nothing is taken away or added

6 0
2 years ago
Calculate the pH of a 0.10 M HCN solution that is 0.0070% ionized.
Anastaziya [24]

Answer:

D) 5.15

Explanation:

Step 1: Write the equation for the dissociation of HCN

HCN(aq) ⇄ H⁺(aq) + CN⁻(aq)

Step 2: Calculate [H⁺] at equilibrium

The percent of ionization (α%) is equal to the concentration of one ion at the equilibrium divided by the initial concentration of the acid times 100%.

α% = [H⁺]eq / [HCN]₀ × 100%

[H⁺]eq = α%/100% × [HCN]₀

[H⁺]eq = 0.0070%/100% × 0.10 M

[H⁺]eq = 7.0 × 10⁻⁶ M

Step 3: Calculate the pH

pH = -log [H⁺] = -log 7.0 × 10⁻⁶ = 5.15

7 0
3 years ago
A geological process changes the weather. the Earth’s surface. the Earth’s core . nothing
seropon [69]
A geological process changes the Earth's surface.
8 0
3 years ago
how long does it take (in minutes) for light to reach Saturn from the sun , a distance of 1.466x10^9 km
vampirchik [111]
The _____ along a gene specifies the type of protein that will be produced.            ^                                                                                                                                         9 k
3 0
2 years ago
The pictures below show samples of different substances.
Mrrafil [7]

Answer:

C. Yes, if each sample contains 6.02 x 10²³ atoms.

Explanation:

It is possible for each sample to contain 1 mole of each sample if and only if each of the sample if made up of 6.02 x 10²³ atoms.

6.02 x 10²³ atoms is the Avogadro's number. This number is equivalent to a mole of a substance.

  • If the amount of matter in the given substance is at least one mole, it is possible that they are made up of one mole each of each substance.
  • If they contain lesser amount of atoms, then it is not up to one mole of substance.
  • But if it is greater, then, we can have even more than one mole of substance.

A mole is simply a unit of measurement and it is equivalent to 6.02 x 10²³ atoms.

3 0
2 years ago
Read 2 more answers
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