CHEMISTRY MIDDLE SCHOOL

which type of heat transfer involve heat flow from hot object to colder object A. convection, but not conduction and radiation B. convection and radiation, but not conduction, convection and conduction, but not radiation D.all of three

Answers

Answer 1
Answer: D option is correct. Because heat can transfer in any form. 

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Why is there a greater variety of compounds than of elements and atoms?

Answers

Despite the fact that there are over 100 elements .The elements containing  electron, proton neutron as well, could  be combined to create new things, making the possibilities unlimited.

What is elements?

A pure substance made up entirely of atoms with the same number of protons in each nucleus is known as an element.

What is electrons?

An electron is just a subatomic particle with a negative charge.  The energy levels of electrons in atoms are represented by spherical shells of different kinds of diameters. 

To know more about element click here.

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because even though there are over 100 elements. all of those elements can combine into something else making the combinations endless.

Please help I will mark brainly

Answers

Look, this shouldn't be that hard.  As long as you know the symbol for each element, you just put a subscript to indicate how many there are in each compound.

For the second row, there is one C and 4 H's.  That's CH_4, or methane.

For the third row, there is one Si and 2 O's.  That's SiO_2, or common glass/quartz.

What is the purpose of the plasma membrane?

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An outer layering of a cell that manages what goes in and out.
Plasma membrane is a biological membrane that separates the interior of all cells from the outside environment.

Explain whether smoke filling up a room is diffusion or not

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it is diffusion because it lingers in the air

On the galapagos islands, Darwin studied many creatures, including finches. Explain what he observed and how it relates to nature selection.

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Darwin observed the beaks of the birds and how the different beaks helped the birds to eat different types of seeds.

This relates to natural selection because certain finches with say a smaller shorter beak would be able to eat only smaller seeds and fruits as to where a finch with a longer larger beak could eat larger bigger seeds and fruits. 

Hope this helped! Have a great day! 

Which of the following is NOT a good technique for managing used oil? A) Have specific, labeled catch pans available for technicians who are collecting oil B) Spills in your shop and any releases on pavement or outside should be poured down a drain C) Do not use oil containers for antifreeze or other non-similar fluids D) Be prepared for oil spills with the proper absorbents

Answers

The answer is: B) Spills in your shop and any releases on pavement or outside should be poured down a drain.

Pouring used oil down a drain can cause damege to environment.

Oil is nonpolar substance and does not dissolve in the water (polar molecule), used oil remain existent in the drain and sewer or in the environment.

Small spills create a cumulative effect with  significant impact on the  environment.

Untended spills inside  a shop can spread to an inside  drain connected to the storm  sewer system and cause floods.
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