Answer:
atomic weight
Explanation:
Mendeleev realised that the physical and chemical properties of elements were related to their atomic weight
hope it helps4
c. hydrogen
b. fuel
d. oxygen
Fuel is NOT an element that must be present for a fire to occur. Hence, option C is correct.
The substances which on burning produce heat energy are called fuels.
The 3 things a fire needs are heat, fuel and oxygen.
These three elements work together to help a fire start and take over.
However, if any of the three elements are removed from a fire, then it will extinguish and no longer pose a threat.
Hence, option C is correct.
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Hi There
The answer is C
I hope that's help !
Which of the following is not related to the First Law of Motion?
An object in motion stays in motion unless acted on by an outside force.
An object at rest will stay at rest.
An object must overcome inertia to begin moving.
Having a heavier mass may increase the force of a moving object.
29
Which of the following is not an example of friction?
Pouring water off a bridge and watching it turn to small drops by the time it hits the ground.
A wrecking ball swinging towards its target.
A piece of ice dropping into a glass of water that sinks more slowly than it fell through the air.
Smoothing an ice rink with a Zamboni.
30
What three quantities are involved with the Second Law of Motion?
acceleration, gravity, inertia
acceleration, inertia, force
mass, gravity, acceleration
acceleration, force, mass
31
Why do phytoplanktons have projections and form long chains?
To catch more food
To respire oxygen more efficiently
To keep from sinking and capture more light
To evade predators
32
If an object's acceleration is zero, which of these could be true?
it is slowing down
it is stopped
it is not changing its speed
Both B and C could be true
The two sub-atomic particles present in the nucleus of an aluminum (Al) atom are: proton and neutrons.
Protons: Positively charged protons are present in the atom's nucleus. They have an approximate relative mass of 1 atomic mass unit (amu), a relative charge of 1, and a relative mass of 1.
Neutrons: The nucleus of an atom contains neutrons, which are neutral particles. They have a relative mass of roughly 1 atomic mass unit (amu) and no electric charge (their charge is zero).
The number of protons in an aluminum atom determines its atomic number, which is 13, and the number of neutrons can vary, resulting in various aluminum isotopes with various masses. Aluminum-27, which has a nucleus made up of 13 protons and 14 neutrons, is the most prevalent isotope of the metal.
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The elements that can form acidic compounds are; sulfur, arsenic, selenium, antimony, silicon.
Acidic compounds are formed by nonmetals. Metallic elements form basic compounds. This means that rubidium does not form acidic compounds since it is a metal.
Also, xenon does not form compounds because it is a noble gas. Noble gases do not react with other elements to form compounds.
However; sulfur, arsenic, selenium, antimony, silicon are nonmetals and they form acidic compounds.
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The correct answer is Sulfur, Arsenic, selenium, silicon, and antimony.