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3 years ago

Light of a certain energy shines on a metal and causes electrons to be emitted.

Chemistry

2 answers:

sashaice [31]3 years ago

8 0

your answer is: the use of that light has a lower frequency

Inessa [10]3 years ago

6 0

Light of certain energy shines on a metal and causes electrons to be emitted. Based on the research of Albert Einstein, the change that would most likely result in stopping the emission of electrons from this metal is to coat the metal.

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A-potassium B-lead C-iron D-magnesium E-zinc

viktelen [127]

The unknown substance : Lead

<h3>Further explanation</h3>

Given

Density of element

mass of unknown substance = 40 g

volume = 3.5 cm³

Required

The density of unknown substance

Solution

Density is the ratio of mass per unit volume

The unit of density can be expressed in g/cm³ or kg/m³

Density formula:

$\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}$

Input the value to find the density of an unknown substance :

ρ = 40 g : 3.5 cm³

ρ = 11.43 g/cm³

If we look at the table, the substance which has a density of 11.43 is Lead

6 0

3 years ago

Does the law of conservation of mass apply to physical changes or just chemical changes?

slega [8]

It applies to both physical and chemical changes.

4 0

3 years ago

PLEASE ANSWER

Makovka662 [10]

Answer:

Answer is D

Explanation:

xrays would be far more efficient at detecting objects through solids.

8 0

3 years ago

What do the noble gases have in common with the halogens? Both noble gases and halogens are

Sauron [17]

The halogens and noble gases are alike because they are all non-metallic elements, with the exception of astatine, a radioactive

5 0

2 years ago

Solid iron is mixed with a solution of copper (I) nitrate to form iron (III) nitrate solution and metal copper. (what is the equ

DedPeter [7]

Answer:

Fe + 3CuNO₃ → Fe(NO₃)₃ + 3Cu

Explanation:

Solid Iron = Fe

Copper (I) nitrate = CuNO₃ (Nitrate, NO₃⁻, always has a charge of -1).

Iron (III) nitrate = Fe(NO₃)₃ (That way the compound has an overall neutral charge)

Metal Copper = Cu

Writing the equation using symbols leaves us with:

Fe + CuNO₃ → Fe(NO₃)₃ + Cu

It is not balanced yet. Now we balance the NO₃ species on the left side:

Fe + 3CuNO₃ → Fe(NO₃)₃ + Cu

Finally we balance the Cu species on the right side:

Fe + 3CuNO₃ → Fe(NO₃)₃ + 3Cu

5 0

2 years ago