Real images can be projected onto a screen. A. True B. False

Chemistry

1 answer:

jolli1 [7]3 years ago

3 0

Answer:

True

Explanation:

A real image can be projected or seen on a screen but a virtual image cannot because a real image is formed when light rays coming from an object actually meet at a point after refraction through a lens while a virtual image is formed when light rays coming from an object only appear to meet at a point when produced ...

Hope this helps you, and Good luck!

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Atoms of a substance are rearranged _______.

Yanka [14]

Atoms are never rearranged

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To indicate the pH of a substance, one can use a dye that is both an acid and that appears as different colors in its protonated

PIT_PIT [208]

Answer:

The pH of the solution is 7.8

Explanation:

The concentration of the solution is 0.001M and the dye could be in its protonated and deprotonated forms. If the concentration of the protonated form [HA] is 0.0002 M the concentration of the deprotonated form will be the subtraction between the concentration of the bye and the concentration of the protonated form:

[A-] = 0.001M - 0.0002M = 0.0008M

Also, the Henderson-Hasselbalch equation is

$pH = pKa + Log \frac{[A^{-}]}{[HA]}$

this equation shows the dependency between the pH of the solution, the pKa and the concentration of the protonated and deprotonated forms. Thus, replacing in the equation

$pH = 7.2 + Log \frac{0.0008M}{0.0002M} = 7.8$

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How many hydrogen (H) atoms are in 1 molecule of (NH4)2S ?

Alex73 [517]

Im not sure but it could be 4 (H)

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3 years ago

You are making a 0.2M solution of sodium acetate in the lab. Sodium acetate has a molecular mass of 82.03 g/mol. How many g of s

lyudmila [28]

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Explanation:

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3 years ago

An ionic compound has the general form, xcly. which option for x and y correctly completes the formula?

igor_vitrenko [27]

Answer:
Case 1:
  X =  Any element from Group I

i)   H
ii)   Li
iii) Na
   iv) K
v)   Rb
vi)  Cs

  Y =  1

Case 2:
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i) Be
ii) Mg
iii) Ca
iv) Sr
v) Ba
vi) Ra

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Case 3:
  X =  Any element from Group III

i)   B
ii)   Al
iii) Ga
   iv) In
v)   Ti

  Y =  3

Explanation:
The general formula given is as follow,

XCly

So, if X has +1 oxidation state, then it will require only one Cl atom with oxidation number -1 to form a neutral compound, therefore, y = 1.

If X has +2 oxidation state, then it will require two Cl atoms with oxidation number -1 to form a neutral compound, therefore, y = 2.

If X has +3 oxidation state, then it will require three Cl atoms with oxidation number -1 to form a neutral compound, therefore, y = 3.

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3 years ago