What causes flaming combustion to occur?Select one:
a. A solid fuel mixes with an adequate amount of liquid fuel to be able to sustain an open burning flame.
b. A gaseous fuel mixes with an adequate amount of oxygen and heats to ignition temperature.
c. A solid fuel encounters an open flame and entrains enough air to ignite.
d. A gaseous fuel encounters an external heat source and experiences piloted ignition.

Answers

Answer 1

Answer:

The option that is correct as regards flaming combustion from the question is A solid fuel mixes with an adequate amount of liquid fuel to be able to sustain an open burning flame.

Combustion can be regarded as exothermic redox chemical reaction which occurs at high temperature between fuel as well as an oxidant.

This oxidant is usually atmospheric oxygen, and the results are mixture of gases which do appear as smoke.

For this flaming combustion to occur, there should be mixture of solid fuel as well as liquid fuel so that the burning flame can be sustained.

Flaming combustion takes place when both visible flames as well as plume of a fire are visible.

Therefore, option A is correct.

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Answer 2

Answer:

Answer is A(Soild Fuil

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Scientists follow specific processes in order to determine valid explanations and conclusions from observations. David observed strange lights in the sky above his home outside of Roswell, New Mexico. The only explanation that makes sense to him is that there are UFOs in the area. What should David do next to verify his explanation?

Answers

Scientists follow specific processes in order to determine valid explanations and conclusions from observations and research any and all data pertaining to the Roswell area, and unidentified flying objects reported in the sky.

What is UFO?

The term UFO means unidentified flying object and David observed strange lights in the sky above his home outside of Roswell, New Mexico. The only explanation that makes sense to him is that there are UFOs in the area and and research any and all data pertaining to the Roswell area, and unidentified flying objects reported in the sky.

The text purpose has been refers to the aim and reason which an author writes the text and the things which he wants his readers to learn from the text.

With this in mind, we can see that from the complete text, there has been the narration of UFOs which are Unidentified Flying Objects which are popularly known as aliens and the text purpose is to inform.

Therefore, Scientists follow specific processes in order to determine valid explanations and conclusions from observations and research any and all data pertaining to the Roswell area, and unidentified flying objects reported in the sky.

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Research any and all data pertaining to the Roswell area, and unidentified flying objects reported in the sky

This is the Correct Answer is B

Edgen Approved :)

a. Define Valency. b. Write the symbol and valency of the following : (i) Oxygen (ii) potassium 7. a. Magnesium burns in Oxygen to form Magnesium Oxide. a) Name the reactants b) Name the Products c) Write the word equation for the above reaction.

Answers

⚘ YourAnswers:

A) Valency is the combining capacity of any element. Valence electrons refers to the electrons found in the outermost shell of the atom of the element.

B) Symbol and valency:

Oxygen(O) = (At. no. 8) = -2(Valency)
Potassium(K) = (At. no. = 19) = +1(Valency)

C) The reaction would be:

$\large{ \boxed{ \rm{2Mg + O_2 \longrightarrow \: 2MgO}}}$

Reactants = Magnesium and Oxygen
Products = Magnesium oxide
Word equation:

$\large{ \boxed{ \rm{Magnesium + Oxygen \longrightarrow Magnesium oxide.</p><p>}}}$

━━━━━━━━━━━━━━━━━━━━

Answer:

Oxygen-Symbol-O Potassium Symbol-K

Matter behaving like a wave rather than like a particle is best illustrated by which phenomenon?

Answers

The photoelectric effect is about electrons being ejected from metals when light is shined on metals. The electrons do not behave like waves in the photoelectric effect. Black body radiation is all about the radiation emitted by warm bodies and not about those bodies behaving like waves. The emission spectra of atoms is all about what light is given off by atoms when electrons in those atoms jump down to lower energy levels from higher levels. That also has nothing to do with matter behaving as a wave. Interference is classically defined as the generation of a new wave with an amplitude modulated according to the waves that interfere to form that new wave. Note its emphasis on the wave part.

Wave X has an amplitude of 5 and wave Y has an amplitude of 4. What will happen when the crest of wave X meets the crest of wave Y?A crest with an amplitude of 1 will form.
A trough with an amplitude of 1 will form.
A crest with an amplitude of 9 will form.
A trough with an amplitude of 9 will form.

Answers

Answer: A crest with an amplitude of 9 will form.

Explanation:

From super position principle, we know that when two waves move in same medium meet, then the net amplitude of the super imposed waves is sum of amplitudes of individual waves.

A constructive superposition takes place when crest meets crest and crest is formed of higher amplitude or trough meets trough and forms trough of higher amplitude. A destructive superposition takes place when crest of one meets trough of other -a crest or trough can form depending on the larger amplitude of either.

In the given situation, crest of wave X meets crest of wave Y. The amplitude of the super imposed wave would be = 5 + 4 = 9 and a crest would form.

The right answer for the question that is being asked and shown above is that: "A crest with an amplitude of 9 will form." Wave X has an amplitude of 5 and wave Y has an amplitude of 4. the crest of wave X meets the crest of wave Y is that A crest with an amplitude of 9 will form.

An object that has a height of 0.4 meter is placed at a distance of 0.7 meter from a concave spherical mirror. An image is formed in front of the mirror and has a height of 0.35 meter. How far from the mirror is the image located?A. 0.2000 m
B. 0.4275 m
C. 0.6125 m
D. 0.8000 m

Answers

Answer

C. 0.6125 m

Explanation

The magnification of an image produced by curved mirrors can be given in two ways;

Magnification, M = (Height of the image) / (height if the object) and

M = (image distance,V) / (Object distance, U).

Using the first formula,

M = 0.35/0.4

= 0.875

Now from the second formula,

M = V/U

0.875 = V/0.7

V = 0.875 × 0.7

= 0.6125 m

Answer : v = 0.1625 m.

Explanation :

It is given that,

Height of an object, $h_o=0.4\ m$

Object distance, $u=-0.7\ m$

Height of an image, $h_i=0.35\ m$

We have to find the image distance (v).

We know that the magnification of mirror is the ratio of height of image to the height of object.

i.e. $m=(h_i)/(h_o)$ ..............(1)

Also, magnification is the ratio of image distance to that of object distance.

i.e $m=(-v)/(u)$ ............(2)

So, from equation (1) and (2)

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

$(-v)/(-0.7\ m)=(0.35\ m)/(0.4\ m)$

$v=0.6125\ m$

So, image is located at a distance of 0.6125 m.

There is little sunlight at high latitudes during the winter, so few crops can grow even if temperatures are regulated. To address this problem, special lamps can be used in greenhouses.These lamps allow plants to grow during the winter months. Scientific knowledge of which topic was necessary to solve this problem?

Answers

Answer;

the colors of light that plants require for photosynthesis

Explanation;

The color of light used for photosynthesis depends on the pigment in the plant. For example, green plants with chlorophylls and carotenoids have a maximum activity with violet-blue and red light.

White light contains various colors, including red, orange, yellow, green, blue, indigo and violet. When plants harvest light for photosynthesis, they only absorb a few colors and reflect the rest. Plants appear green because chlorophyll absorbs other colors and reflects green.

Answer:

the colors of the light that plants require for photosynthesis

Explanation:

pretty sure im right

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