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3 years ago

Francis is learning about dissolving at school. She reads descriptions about the rate of dissolving from four of her friends.

Chemistry

2 answers:

Naddika [18.5K]3 years ago

7 0

Answer:

I personally think Manuel

Explanation:

docker41 [41]3 years ago

7 0

Um tbh in my opinion I think it’s b

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List two examples of objects at home that use chemical energy and describe what the chemical energy is being transformed into.

mr_godi [17]

Answer: Batteries and Food

Explanation:

On the batteries that we use for example for a watch in the kitchen, occurs a chemistry reaction, called redox between Zn and MnO2. The Zn is oxidized (in the anode) and the MnO2 is reduced (in the cathode). In the oxidation, the athom loses electrons and in the reduction the opposites.

Regarding the chemical reactions that occur in the food that we consume, the hydrolisis that occurs in the stomach. The hydrochloric acid that is secreted in the stomach allows the activation of an enzyme, pepsinogen, which hydrolyzes the proteins present in the food consumed. That is, it hydrolyzes the peptide bonds of the proteins, which is between an amino and carboxyl bond of each amino acid that makes them up.

4 0

4 years ago

What is the concentration of NaCl in a solution if titration of 15.00 mL of the solution with 0.2503 M AgNO3 requires 20.22 mL o

Nina [5.8K]

Answer:

The concentration of NaCl = 0.3374 M

Explanation:

Given :

Molarity of AgNO₃ = 0.2503 M

Volume of AgNO₃ = 20.22 mL

The conversion of mL into L is shown below:

$1 mL= 10^{-3} L$

Thus, volume of the solution = 20.22×10⁻³ L

Molarity of a solution is the number of moles of solute present in 1 L of the solution.

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

The formula can be written for the calculation of moles as:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

Thus,

$Moles\ of\ AgNO_3 =Molarity \times {Volume\ of\ the\ solution}$

$Moles\ of\ AgNO_3 =0.2503 \times {20.22\times 10^{-3}}\ moles$

$Moles\ of\ AgNO_3 = 5.0611 \times 10^{-3} moles$

The chemical reaction taking place:

$AgNO_3_(aq) + NaCl_(aq) \rightarrow AgCl_(s) + NaNO_3_(aq)$

According to reaction stoichiometry:

1 mole of AgNO₃ reacts with 1 mole of NaCl

Thus,

5.0611×10⁻³ moles of AgNO₃ reacts with 5.0611×10⁻³ moles of NaCl

Thus, moles of NaCl required = 5.0611×10⁻³ moles

Volume of NaCl required = 15.00 mL

The conversion of mL into L is shown below:

$1 mL= 10^{-3} L$

Thus, volume of the solution = 15.00×10⁻³ L

Applying in the formula of molarity as:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

$Molarity\ of\ NaCl=\frac{5.0611\times 10^{-3}}{15.00\times 10^{-3}}$

$Molarity\ of\ NaCl= 0.3374 M$

Thus, the concentration of NaCl = 0.3374 M

6 0

3 years ago

Different oil refineries in UAE

solniwko [45]

Answer:

Petroleum refinery capacity in the UAE 2009-2018

In 2018, the total production capacities of all refineries in the UAE were 1.13 metric barrels per day. Total total production capacity of the al-Ruwais refinery in the United Arab Emirates was approximately 817,000 metric barrels per day.

6 0

3 years ago

How many molecules are in 10.0 moles of c2h6o?

arlik [135]

1 mole ----------------- 6.02 x 10²³ molecules
10.0 moles ----------- ( molecules C2H6O)

molecules = 10.0 x ( 6.02 x 10²³ ) / 1

molecules = 6.02 x 10²⁴ / 1

= 6.02 x 10²⁴ molecules of C2H6O

6 0

3 years ago

Read 2 more answers

3.544g of hydrogen gas contains

Free_Kalibri [48]

Answer:

1.772 mols

Explanation:

Because hydrogen exists as a diatomic molecule in gaseous state, that's (H2), so then it's molecular mass is 1 ×2= 2g/mol.

we can now calculate for the number of moles, so

n=m/Mr

n=3.544/2

n=1.772mols

4 0

3 years ago