CHEMISTRY HIGH SCHOOL

If an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 millimeters in front of the lens what is the height of the image

Answers

Answer 1
Answer:

Answer:The height of the image is -6 mm.

Explanation;

Distance of the object form the lens = u = 12 mm

Distance of the image formed from the lens = v = 4 mm

Height of the object = 18 mm=h_o

The magnification is given by :

M=-(v)/(u)=(h_i)/(h_o)

h_i\& h_o= Height of an image and object respectively.

M=-(4 mm)/(12 mm)=(h_i)/(18 mm)

h_i=-6 mm

The height of the image is -6 mm.The image formed is real and negative sign signifies that image is inverted.

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How many moles of oxygen are formed when 58.6 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11 g/mol.4 KNO3(s) → 2 K2O(s) + 2 N2(g) + 5 O2(g)
An acid-base indicator is used in what type of reaction? A. neutralization B. combination C. decomposition D. combustion
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1. For each of the following numbers, by how many places must the decimal point bemoved to express the number in scientific notation?II. For each number, will the exponent be positive, negative, or zero?0.0000089911

Is hair abiotic or biotic

Answers

Hair is biotic factor because even though it may seem dead it is still a living factor on your body.

Answer:

Hair is an abiotic factor because it is actually not living.

Which balanced equation represents a redoxreaction?
(1) CuCO3(s) ==> CuO(s) + CO2(g)
(2) 2KClO3(s)==>2KCl(s) + 3O2(g)
(3) AgNO3(aq) + KCl(aq) ==>AgCl(s) + KNO3(aq)
(4) H2SO4(aq) + 2KOH(aq)==> K2SO4(aq) + 2H2O(l)

Answers

Option no. 2  Balanced equation     

2KClO3(s)⇒2KCl(s) + 3O2(g)
      K=2             K=2
      Cl=2            Cl=2
      O=6             O=6

If a solid piece of naphthalene is heated and remains at 80 degrees C until is is completely melted, you know that 80 is the what?

Answers

Answer: The given temperature is known as melting point of naphthalene.

Explanation:

Melting point is defined as the temperature at which solid gets converted to liquid.

The temperature remains constant until all the solid has been converted to liquid. At this temperature, solid state and liquid state are present at equilibrium.

\text{Solid state}\rightleftharpoons \text{Liquid state}

We are given:

A solid piece of naphthalene is heated till 80°C until all the solid is melted.

Hence, the given temperature is known as melting point of naphthalene.

If a solid piece of naphthalene is heated and remains at 80 degrees Celsius until it is completely melted, you know that 80 degrees Celsius is the melting point of the solid naphthalene. This is the maximum temperature at which the chromium is in its solid form.

which of the following describes a neutral atom of oxygen?. a.6 protons. 6 neutrons, 6 electrons. b. 6 protons, 6 neutrons, 8 electrons. c. 8 protons, 8 neutrons, 10 electrons. d. 8 protons, 8 neutrons, 8 electrons

Answers

the one that describe a neutral atom of oxygen would be : D. 8 protons, 8 neutrons, and 8 electrons

In periodic table, oxygen has a mass number of 16 and 8 electrons

In order to get neutrons, we just need to subtract 16 with 8 , and we get 8 neutrons

hope this helps

D. 8 protons, 8 neutrons, 8 electrons

1. The following reaction does not proceed to form a product: H2O + Au---> no reaction. Why is that?A) Gold has a higher activity than hydrogen and cannot replace it.
B) Gold has a lower activity than hydrogen and cannot replace it.
C) The reaction cannot occur because water is a reactant.
D) The reaction proceeds too slowly to create products.


2. Which of the following is the balanced form of the equation C2H6 + O2 --> CO2 + H2O?

answer choices are attached A,B,C,D top to bottom

3. The equation 2NaNO3 + CaCl2 ---> 2NaCl + Ca(NO3)2 is balanced. How many atoms of sodium (Na) are there on either side of the equation?

A) one
B) two
C) four
D) six

4. All single-displacement reactions can be classified as another type of reaction as well. What type of reaction is that?

A) combustion
B) redox
C) synthesis
D) decomposition

5. If ions change places and a gas is formed, then what type of reaction is indicated?

A) double-displacement
B) synthesis
C) decomposition
D) single-displacement

Answers

1. B
The positive charge in water is provided by hydrogen, and gold provides the same charge. However, gold is not more reactive than hydrogen so it can not replace it in the compound.

2. In order to balance the equation, you must sure there are equal moles of each element on the left and right side of the equation:
2C₂H₆ + 7O₂ → 4CO₂ + ₆H₂O

3. The number of moles of sodium atoms on the left of the equation must be equal to the number of moles of sodium atoms on the right, as per the law of conservation of mass. The answer is B.

4. C.
A synthesis reaction usually results from single displacement because some element or compound is produced in its pure form

5. B. 
The gas being produced is being synthesized.

What two types of compounds is water especially good at dissolving?

Answers

Answer:

ions and polar molecules
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