Chemistry
Ca(OH)2+HCl → CaCl2+H2O
Ca(OH)2+2HCl → CaCl2+2H2O
Calcium Hydroxide+ Phosphorous acid→
calcium hydroxide+ phosphorous acid→ phosphorous calcium+ water
What's the speed of light?
300,000km/s
What are the colours in the visible light spectrum?
red, orange, yellow, green, blue, indigo, violet
A light ray strikes a plane mirror at a certain angle and reflects off the mirror. Which of the following options correctly describes the basic law of reflection?
A. The angle of reflection is equal to the angle of incidence.
B. The angle of reflection is greater than the angle of incidence.
C. The angle of reflection is less than the angle of incidence.
D. The reflected ray and the incident ray lie on the same straight line.
A
K3PO4+Ca(NO3)2 → KNO3+Ca3(PO4)2
2K3PO4+3Ca(NO3)2 → 6KNO3+Ca3(PO4)2
chloric acid +strontium hydroxide→
chloric acid +strontium hydroxide→ strontium chloric+ water
If in a vacuum what travel as the same speed of light?
Electromagnatic waves
What colour of visible light have less energy than the green light?
red, orange, yellow
In a certain scenario, a beam of light strikes a plane mirror perpendicularly. Which of the following options correctly describes the behavior of the reflected ray?
A. The reflected ray coincides with the incident ray and returns along the original path.
B. The reflected ray deviates from the incident ray, forming an acute angle.
C. The reflected ray deviates from the incident ray, forming an obtuse angle.
D. The reflected ray is in the opposite direction of the incident ray, forming a 180-degree angle.
A
BaCl2+H2SO4→
BaCl2+H2SO4 → BaSO4+2HCl
sulfuric acid+ potassium hydroxide→
sulfuric acid+ potassium hydroxide→ potasslum sulfate+ water
Which of the seven types of electromagnatic waves has the least energy?
radio waves
What's the wavelength range of red light?
About 620-700 nanometers.
Reflection is the phenomenon where light waves or sound waves return to the original medium after encountering an obstacle. Which of the following best describes the phenomenon of reflection?
A. Refraction of light waves between different media
B. Absorption of light waves during propagation
C. Light waves returning to the original medium after encountering an obstacle
D. Scattering of light waves while propagating through a medium.
C
Pb(NO3)2+KI → PbI2+KNO3
Pb(NO3)2+2KI → PbI2+2KNO3
What is used in a microscope to magnify the object being observed?
Objective and eyepiece.
Which part of the electromagnetic spectrum is visible light?
Between infrared and ultraviolet.
The law of reflection states that the angle of incidence equals the angle of reflection. Which of the following correctly describes the law of reflection?
A. The angle of incidence equals the angle of refraction B. The angle of incidence equals the angle of reflection C. The angle of incidence is greater than the angle of reflection
D. The angle of incidence is less than the angle of reflection
B
Na2SO4+Ba(NO3)2 →
Na2SO4+Ba(NO3)2 → BaSO4+2NaNO3
In what fields is light used?
Just be reasonable.
How are the rainbows formed?
Refraction, reflection and scattering of light.
Which of the following describes the characteristics of image formation in a plane mirror?
A. The image forms in front of the mirror and is real
B. The image forms behind the mirror and is virtual
C. The image forms in front of the mirror and is virtual D. The image forms behind the mirror and is real
B