ch 4,5
full form of pH
potential of hydrogen
Frequency is the number of vibrations or oscillations made in one second.
It tells us how fast something is vibrating.
🔹 The unit of frequency is hertz (Hz).
baking powder and vinegar mixed together releases which gas
co2
what are electrons and how to they flow in a circuit
Electrons are very tiny negatively charged particles found inside atoms. They flow from negative to positive terminals in a circuit
what is dislacement
Displacement is the shortest way ,path or distance between the starting point and the ending point
what is centrifugation and how does it work
centrifugation is used to separate substances with different densities.
in centrifugation the mixture is spun at high sp eed causing denser substance to settle down
What is shadow
Shadow is a dark area formed when an object blocks light.
When light travels in a straight line and something opaque (like a book or your body) comes in its path, the light cannot pass through it. The area behind the object where light does not reach becomes a shadow
magnesium plus hydrochloric acid is
magnesium chloride plus hydrogen
What is the unit of electric current?
The unit of electric current is ampere (A).
what is SI unit of pressure
pascal
What is the offspring of camel and lama called
Cama.
Who gave theory of continental drift and when
Alfred Wagner, 1912
what piece of apparatus used to neutralize acids
burette
What happens in a series circuit if one bulb fuses?
If one bulb fuses, the circuit becomes incomplete (broken).
Because the path is broken:
Current cannot flow.
All the other bulbs also go off.
formula of speed
speed is distance divided by time
List steps for how to use dichotomous key or make an dichotomous key to find an specific type organism.
First, choose the organism you want to identify.
Start at the top of the dichotomous key.
Read the first pair of statements and answer yes or no (or choose the correct option).
Follow the direction given next to your answer.
Continue answering each pair of questions.
Keep following the lines until you reach the name of the organism.
What are the three different types of movements of plate boundaries?
Convergent boundary – Plates move towards each other.
Divergent boundary – Plates move away from each other.
Transform boundary – Plates slide past each other horizontally.
name reactants for forming precipitate of silver chloride and by product calcium nitrate
silver nitrate plus calcium chloride
Compare series and parallel circuits. Which is safer for household wiring and why?
In a series circuit, all components are in one path. If one stops working, all stop.
In a parallel circuit, components are in separate branches. If one stops working, others continue.
Parallel circuits are safer for homes because appliances work independently. 💡
what is newtons second law
f = ma
Brass is made up of copper and zinc. what else is added to it. Name any 3
lead, aluminum, magnesium,silicon
Explain annular solar eclipse and penumbral lunar eclipse.
An annular solar eclipse occurs when the Moon comes between the Sun and the Earth but is farther away from the Earth. Because it appears smaller, it does not completely cover the Sun. A bright ring of sunlight remains visible around the Moon.
A penumbral lunar eclipse occurs when the Moon passes through the outer shadow (penumbra) of the Earth. The Moon becomes slightly dim, but it does not turn completely dark because it does not enter the Earth’s full shadow.
when apple piece is in hydrogen peroxide which gas is given off
oxygen
Two identical bulbs are connected in series to a battery. Later, they are connected in parallel to the same battery.
Which arrangement will make the bulbs glow brighter? Explain using flow current or voltage basis.
In series, voltage is divided between bulbs → each gets less voltage → dimmer.
In parallel, each bulb gets full battery voltage → brighter.
if a horse tied with horse of 5m makes a half revolution of circle (semicircle] what is the distance travelled
a circumference is 2πr so half a circle will be 2πr divided by 2 so 2π5 divided by 2 is
15.7