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4 years ago

The rate at which a reaction is proceeding at a specific point in time is called the:______

Chemistry

2 answers:

vredina [299]4 years ago

7 0

It is called an instantaneous rate

IgorC [24]4 years ago

7 0

Answer:

instantaneous rate

Explanation:

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What is the volume of the sample at stp?

Yuki888 [10]

At stp the volume is 22.4 L .

hope this helps!

3 0

4 years ago

Complete the sentences to identify the trend in first ionization energies as one proceeds down the group 7A elements and explain

Harrizon [31]

Answer:

a)decrease

b)increase

c)smaller

d)smaller

Explanation:

Ionization energy decreases down the group due to increase in the atomic radius. The distance between the outermost electron and the nucleus increases hence the nuclear attraction for the outermost electrons become smaller and the ionization energy also become smaller as electrons are now easily removed from the outermost shell.

Hence the group of answer choices provided above.

3 0

3 years ago

Ca(OH)₂(s) precipitates when a 1.0 g sample of CaC₂(s) is added to 1.0 L of distilled water at room temperature. If a 0.064 g sa

Alex

Answer:

D) Ca(OH)₂ will not precipitate because Q < Ksp

Explanation:

This is a question in which we will employ the reaction quotient Q to determine whether a precipitate will form.

Here we have first a chemical reaction in which Ca(OH)₂ is produced:

CaC₂(s) + H₂O ⇒ Ca(OH)₂ + C₂H₂

Ca(OH)₂ is slightly soluble, and depending on its concentration it may precipitate out of solution.

The solubility product constant for Ca(OH)₂ is:

Ca(OH)₂(s) ⇆ Ca²⁺(aq) + 2OH⁻(aq)

Ksp = [Ca²⁺][OH⁻]²

and the reaction quotient Q:

Q = [Ca²⁺][OH⁻]²

So by comparing Q with Ksp we will be able to determine if a precipitate will form.

From the stoichiometry of the reaction we know the number of moles of hydroxide produced, and since the volume is 1 L the molarity will also be known.

mol Ca(OH)₂ = mol CaC₂( reacted = 0.064 g / 64 g/mol = 0.001 mol Ca(OH)₂

Thus the concentration of ions will be:

[Ca²⁺ ] = 0.001 mol / L 0.001 M

[OH⁻] = 2 x 0.001 M = 0.002 M ( From the coefficient 2 in the equilibrium)

Now we can calculate the reaction quotient.

Q= [Ca²⁺][OH⁻]² = 0.001 x (0.002)² = 4.0 x 10⁻⁹

Q < Ksp since 4.0 x 10⁻⁹ < 8.0 x 10⁻⁸

Therefore no precipitate will form.

The answer that matches is (D)

6 0

3 years ago

A sample of zinc is heated to a temperature of 77.4ºC, then placed in a calorimeter containing 65.0 g of water. Temperature of w

ycow [4]

180.189 g was the mass of the zinc sample with a specific heat of zinc is 0.390 j/g°C.

<h3>What is specific heat capacity?</h3>

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Using specific heat capacity formula here:

$C_{Zn}$ × $m_{Zn}$ × Δ $T_{Zn}$ = $C_{H_2O}$ × $m_{H_2O}$ × Δ $T_{H_2O}$

0.390J/g°C × $m_{Zn}$ ×77.4ºC = 4.184J/g°C× 65.0g × 20.00ºC.

$m_{Zn}$ = 180.189 g

Hence, 180.189 g was the mass of the zinc sample.

Learn more about the specific heat capacity here:

brainly.com/question/19339241

#SPJ1

5 0

2 years ago

Please help me fill this all out! (Will give brainliest and a heart) This has to do with the fight or flight response.

Alenkinab [10]

Being at the beach: Joyous, thrilled - Smiling, jumping (for joy)
Seeing a tornado nearby: Terror, despair - Crying, shaking
Crossing paths with a grizzly bear: Doom, hopelessness - Frozen, sweating
Skydiving: Anxious, excited - Fidgeting, nervous laughter
Noticing a suspicious figure...: Suspicious, frightened - Observing, running
Seeing a neighbors house on fire: Pity, distress - Frowning, shaking
Seeing two dogs..: Affectionate, happiness - Smiling, giggling
Receiving money: Surprised, relieved - Jumping for joy, crying

Fight or flight response, tornado, grizzly bear, fire, suspicious figure, - maybe skydiving if you chicken out?

These are all opinions though hopefully this helps.

8 0

3 years ago