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- many elements doesn't exist in pure form in the nature
- many objects are made from alloys
- many objects are mixture of compounds
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Why Mendeleev was able to observe periodicity?
mendeleev arranged elements according to atomic mass. He was able to observe periodicity when arranged in this pattern.
. To categorize the elements what reactions did Mendeleev observe?
These are of course chemical reactions, for example oxydation.
What is a safe way to observe objects near the sun?
You could put your hand over the sun and look around it.
What must happen for you to be able to observe an objects chemical properties?
only when a change occurs and a new substance is formed
A grouping of k objects taken from a set of n elements is a?
combination
When you observe objects in space why does it seem that the objects you observe are moving across the sky?
Because the earth is rotating.
What tools are used to observe objects?
Tools such as magnifying glasses and microscopes can be used to better observe objects.
How can you observe objects in space?
spacecrafts
How far away are the farthest objects we can observe?
With the naked eye, the most remote object is the Andromeda galaxy.
What properties would you observe when you use a metric ruler?
You would observe the length of objects.
How do things observe?
Things observe objects by capturing light rays reflected by the objects. The information in the captured rays are processed by the brain or electronically to produce an image.
What objects is elements commonly found in?
all objects are made of some elements and its atoms.
What is a device that is used to observe distant objects?
A telescope.
Do periscopes allow you to see hidden objects?
No, periscopes allow you to observe objects while you are hidden.
What objects did Isacc Newton observe to discover gravity?
An apple
Are magnifying glasses used to observe small objects?
yeah...
How does microscopes help scientists observe objects?
it performs calculations.
