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Marina CMI [18]
2 years ago
15

Jon does an experiment in which he varies the amount of calcium chloride (CaCl2) powder used for the chemical reaction with sodi

um bicarbonate (NaHCO3). He plans to observe whether the amount of CaCl2 powder has an effect on reaction rate.
Make the most logical prediction for the results of his experiment using the drop-down menus.

I predict that using a larger amount of calcium chloride powder will
______
a. increase
b. decrease
c. have no effect on

the reaction rate because the calcium chloride molecules will ______
a. have more kinetic energy
b. balance the number of product molecules
c. collide more often with other reactant molecules
Chemistry
1 answer:
asambeis [7]2 years ago
8 0

Answer:

a.) increase

c.) collide more often with other reactant molecules

Explanation:

Generally, when you increase the quantity of reactants, the rate of the reaction increases (the forward reaction). When there are more reactants, there are more chances for them to interact with each other. More interactions means more reactions.

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A pair of students found the temperature of 100. g of water to be 26.5°C. They then dissolved 8.89 g of AgNO3 in the water. When
bekas [8.4K]

Explanation:

Initial temperature of the water = T_i=26.5^oC

Final temperature of the water = T_f=23.7^oC

a) Change in temperature of the water,ΔT = T_f-T_i

\Delta T=23.7^oC-26.5^oC=-2.8^oC

Change in temperature of the water,ΔT is -2.8°°C.

b) Endothermic reaction : Reaction in which heat absorbed and the temperature if the surrounding is decreased.

Exothermic reaction : Reaction in which heat released and the temperature if the surrounding is increased.

On dissolving silver nitrate in water the temperature of the water decreased 2.8 degree Celsius  which means that energy water was absorbed by solid silver nitrate to get dissolve in water. Hence, endothermic reaction.

(f)  Mass of silver nitrate = 8.89 g

Moles of silver nitrate = \frac{8.89 g}{170 g/mol}=0.05229 mol

AgNO_3(aq)\rightarrow Ag^+(aq)+NO_3^-(aq)

1 mole of silver nitrate gives 1 mole of silver ion i.e. cation.

Then 0.05229 moles of silver nitrate will give:

\frac{1}{1}\times 0.05229 mol=0.05229 mol silver ions.

0.05229  moles of cations are produced.

1 mole of silver nitrate gives 1 mole of nitrate ion i.e. anion .

Then 0.05229 moles of silver nitrate will give:

\frac{1}{1}\times 0.05229 mol=0.05229 mol nitrate ions.

0.05229  moles of anion are produced.

5 0
3 years ago
Which phase change is the opposite of boiling?
cestrela7 [59]
Condensation is the opposite of boiling
3 0
3 years ago
The energy stored in foods and fuels is?
elixir [45]
Chemical potential energy
5 0
3 years ago
A barium hydroxide solution is prepared by dissolving 2.06 g of Ba(OH)2 in water to make 32.9 mL of solution. What is the concen
navik [9.2K]

Answer:  1.36 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

where,

n = moles of solute

To calculate the moles, we use the equation:

moles of solute= \frac{\text {given mass}}{\text {molar mass}}=\frac{2.06g}{171g/mol}=0.0120moles

Molarity=\frac{0.0120\times 1000}{32.9}=0.364M

The balanced reaction between barium hydroxide and perchloric acid:

2HCIO_4+Ba(OH_)2\rightarrow BaCIO_4+2H_2O

To calculate the concentration of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is HClO_4

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is Ba(OH)_2

We are given:

n_1=1\\M_1=?\\V_1=8.50mL\\n_2=2\\M_2=0.364M\\V_2=15.9mL

Putting values in above equation, we get:

1\times M_1\times 8.50=2\times 0.364\times 15.9\\\\M_1=1.36M

Thus the concentration of the acid is 1.36 M

4 0
3 years ago
Help help help help! Kingdom
Brrunno [24]

Answer:

all 4 of the middle ones are part of the nucleus

3 0
3 years ago
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