Answer:
They test it using the scientific method.
Answer:
0.4
Explanation:
Given data:
Number of moles of SrCl₂ consumed = ?
Mass of ZnCl₂ produced = 54 g
Solution:
Chemical equation:
ZnSO₄ + SrCl₂ → SrSO₄ + ZnCl₂
Number of moles of ZnCl₂:
Number of moles = mass/ molar mass
Number of moles = 54 g/136.3 g/mol
Number of moles = 0.4 mol
Now we will compare the moles of ZnCl₂ with SrCl₂ from balance chemical equation.
ZnCl₂ : SrCl₂
1 : 1
0.4 : 0.4
Thus when 54 g of ZnCl₂ produced 0.4 moles of SrCl₂ react.
The answer for the following problem is mentioned below.
- <em><u>Therefore the mass of an object is 14.16 grams.</u></em>
Explanation:
Force:
The push or pull on an object with mass that cause change in the velocity
It is a vector quantity.
The formula to calculate the force is:
F = m × a
Given:
Force (F) = -136 N
acceleration (a) = -9.6 m/s^2
To calculate:
mass of the object (m)
We know that,
<em>F = m × a</em>
where,
F represents the force of the object
m represents mass of an object
a is acceleration of an object
From the equation;
-136 = m × -9.6
m =
m = 14.16 grams
<em><u>Therefore the mass of an object is 14.16 grams.</u></em>
Answer:
reaction B
Explanation:
From Arrhenius equation
k=A e-Ea/RT
Where
K= rate constant
Ea= activation energy
R= universal gas constant
T= temperature in kelvin
A= frequency factor
The higher the activation energy, the lower the value of e-Ea/RT. If A is constant for reaction A and B, then the reaction with lower activation energy will have a higher value of rate constant, k because e-Ea/RT will have a higher value. Hence reaction B having a greater activation energy will have a smaller value of rate constant k.
Answer:
air
Explanation:
air has much less resistance than water, and echos are just propagating mediums