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leva [86]
1 year ago
14

In a coffee shop, the following coffee samples are prepared for customers. i. 10 g of sugar added to 100 g of coffee ii. 10 g of

sugar added to 200 g of coffee iii. 4 g of sugar added to 200 g of coffee iv. 4 g of sugar added to 100 g of coffee Based on the amount of sugar added, which sequence ranks the coffee from the sweetest coffee to the least-sweet coffee?
Chemistry
2 answers:
madreJ [45]1 year ago
8 0

The answer is:   i, ii, iv, iii

dem82 [27]1 year ago
4 0

So solve this we must know the amount of sugar per gram of coffee

<span>i.              </span>10 g sugar /100 g coffee = 0.1 g sugar/ 1 g coffee

<span>ii.            </span>10 g sugar / 200 g coffee = 0.05 g sugar / 1 g coffee

<span>iii.           </span>4 g sugar / 200 g coffee = 0.02 g sugar / 1 g coffee

<span>iv.           </span>4 g sugar / 100 g coffee = 0.04 g sugar / 1 g coffee

 

So the ranking from sweetest so the least is:

<span> i, ii, iv, iii</span>

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Given the following equation: Ca(OH)2 + 2HNO3 --&gt; 2 H2O
Burka [1]

Answer: 4.45 moles of H_2O will be produced.

Explanation:

The balanced chemical equation:

Ca(OH)_2+2HNO_3\rightarrow 2H_2O+Ca(NO_3)_2

As nitric acid is the excess reagent, calcium hydroxide is the limiting reagent as it limits the formation of product.

According to stoichiometry :

1 mole of Ca(OH)_2 produce = 2 moles of H_2O

Thus 2.27moles of Ca(OH)_2 will produce =\frac{2}{1}\times 2.27=4.54moles  of H_2O

Thus 4.45 moles of H_2O will be produced.

5 0
2 years ago
A sample of gas at 90 degrees Celsius occupies 15.5 L. This gas is heated to occupy a new volume of 20.3L. What is the new tempe
Ilya [14]

Answer:

202 °C

Explanation:

From the question given above, the following data were obtained:

Initial temperature (T₁) = 90 °C

Initial volume (V₁) = 15.5 L

Final volume (V₂) = 20.3 L

Final temperature (T₂) =?

Next, we shall convert 90 °C to Kelvin temperature. This is illustrated below:

T(K) = T(°C) + 273

Initial temperature (T₁) = 90 °C

Initial temperature (T₁) = 90 °C + 273

Initial temperature (T₁) = 363 K

Next, we shall determine the final temperature.

Initial temperature (T₁) = 363 K

Initial volume (V₁) = 15.5 L

Final volume (V₂) = 20.3 L

Final temperature (T₂) =?

V₁ / T₁ = V₂ / T₂

15.5 / 363 = 20.3 / T₂

Cross multiply

15.5 × T₂ = 363 × 20.3

15.5 × T₂ = 7368.9

Divide both side by 15.5

T₂ = 7368.9 / 15.5

T₂ ≈ 475 K

Finally, we shall convert 475 K to celsius temperature. This is illustrated below:

T(°C) = T(K) – 273

T₂ = 475 – 273

T₂ = 202 °C

Thus, the new temperature of the gas is 202 °C

7 0
1 year ago
Hydrogen and carbon atoms bonded with single bonds are called:
photoshop1234 [79]
For the first question, the answer is D because C because alkanes have single bonds ( alkenes have double bonds). For the second question, the prefix is pen.
3 0
2 years ago
The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium h
Ganezh [65]

Answer:

[ NaOH ] = 0.026 M

Explanation:

  • molarity NaOH = mol NaOH / Vsln(L)

∴ Vsln = 20.46 mL = 0.02046 L

  • NaOH(aq) + KHC8H4O4(aq) →  KNaC8H4O4(aq) + H2O(l)

∴ Mw KH(KHC8H4O4) = 204.24 g/mol

⇒ mol KHP = 0.1082 g / 204.24 g/mol = 5.298 E-4 mol

⇒ mol NaOH = (5.298 E-4 mol KHP)( mol NaOH/mol KHP)

⇒ mol NaOH = 5.298 E-4 mol

⇒ [ NaOH ] = 5.298 E-4 mol / 0.02046 L

⇒ [ NaOH ] = 0.026 mol/L = 0.026 M

5 0
2 years ago
Which notation designates a possible value for a principal energy level in an atom?
Nata [24]

Answer:

2

Explanation:

There are four quantum numbers:

Principal quantum number (n)

Azimuthal quantum number (l)

Magnetic quantum number (ml)

Principal quantum number (n)

It tell about the energy levels.  It is designated by n.

For example,

If n =2

It means there are two energy level present.

Azimuthal quantum number (l)

The azimuthal quantum number describe the shape of orbitals. Its value for s, p, d, f... are 0, 1, 2, 3. For l=3

(n-1)

4-1 = 3

it means principle quantum is 4 and electron is present in f subshell.

Magnetic quantum number (ml)

It describe the orientation of orbitals. Its values are -l to +l. For l=3  the ml will be -3 -2 -1 0 +1 +2 +3.

Spin quantum number (ms)

The spin quantum  number tells the spin of electron either its clock wise (+1/2) or anti clock wise (-1/2).

If the electron is added in full empty orbital its spin will be +1/2 because it occupy full empty. If electron is already present and another electron is added then its spin will be -1/2.

3 0
1 year ago
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