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Brut [27]
3 years ago
5

Making wire from a block of copper. Physical Change or Chemical Change?

Chemistry
2 answers:
KIM [24]3 years ago
5 0

Answer:

Physical Change ...........

8090 [49]3 years ago
3 0

Answer:

physical

Explanation:

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Two metals (Metal A and Metal B) are both exposed to a laser which emits photons that have a greater energy than the work functi
Tresset [83]

Answer:

shorter than

equal to

Explanation:

Let us go back to the Einstein photoelectric equation;

KE = E - Wo

Where

KE = kinetic energy of the photoelectron

E = energy of the incident photon

Wo = work function of the metal

But KE = 1/2mv^2

Thus the velocity of the emitted photoelectron  is determined by the kinetic energy of the emitted photoelectron.

Since the work function of metal A is smaller than that of metal B, the kinetic energy of photoelectrons emitted from metal A is greater than that of photoelectrons emitted from metal B . Therefore, the velocity of electrons from metal A is greater than those from metal B.

From de Broglie relation;

λ = h/mv

Where;

λ = de Broglie wavelength

h = Plank's constant

m = mass

v = velocity

Metal A producing electrons with greater velocity will lead to a shorter de Broglie wavelength compared to those from metal B.

The number of photoelectrons ejected is determined by the intensity of the photons and not the energy of the incident photons or the work function of the metals. Since the two metals are exposed to the the same laser, equal number of photoelectrons are produced for metals A and B.

8 0
3 years ago
Which of the following scenarios is representative of parasitism?
Alex73 [517]
What are the following answers?
5 0
4 years ago
Read 2 more answers
What is this because this is some stuff I don't know and supposedly they say its 7th grade stuff
HACTEHA [7]

Answer:

Radiation

Explanation:

The transfer of heat energy to hot body to cold body is called radiation

3 0
3 years ago
Read 2 more answers
How many moles of gas at 58° C does it take to fill a 1.75 L flask to a pressure of 12.5 kPa? Please help I will give brainliest
marin [14]

Answer:

0.008 moles of gas are present

Explanation:

Given data:

Volume of gas = 1.75 L

Number of moles =  ?

Temperature of gas = 58°C

Pressure of gas = 12.5 KPa

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

58+273 = 331 K

Pressure = 12.5/101 = 0.12 atm

by putting values in formula:

0.12 atm× 1.75 L = n× 0.0821 atm.L/ mol.K   ×331 K

0.21 atm.L = n× 27.17atm.L/ mol

n = 0.21 atm.L /27.17atm.L/ mol

n = 0.008 mol

3 0
3 years ago
Find the mass of sucrose (molecular mass=342) required to be dissolved per 600cm² solution to prepare a semi molar solution.
Natalka [10]

Answer:

102.6 g

Explanation:

Firstly, let's understand the terms used in the question. Semi-molar solution is a solution which has a molarity of:

c=\frac{1}{2} M=0.5 M

We're given the molar mass of:

M=342 \frac{g}{mol}

Let's use the definition of molarity: molarity is the ratio between the moles of solute and the volume of solution:

c=\frac{n}{V}

From here, we wish to express moles, n, as the ratio of mass of sucrose to its molar mass:

n=\frac{m}{M}

Substitute it back into the equation of molarity:

c=\frac{n}{V}=\frac{\frac{m}{M} }{V}=\frac{m}{MV}

Since we wish to find mass, let's multiply both sides of the equation by MV to obtain mass equation:

m=cMV

Now, convert volume into liters knowing that 1 mL = 1 cm³ and 1000 mL = 1 L:

600 cm^3 \cdot\frac{1 mL}{1 cm^3} \cdot \frac{1 L}{1000 mL} =0.600 L

Substitute all three variables into the equation:

m=0.5 M\cdot342 \frac{g}{mol}\cdot0.600 L=102.6 g

4 0
3 years ago
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