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dalvyx [7]
3 years ago
8

The reactants of two chemical equations are listed.

Chemistry
1 answer:
DerKrebs [107]3 years ago
6 0

Answer:

equation 1: AgNo3 + Zn is the reaction because of the zinc

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When you use a crowbar to lift a large rock, you are working against the force called
Ne4ueva [31]
Gravity. The rock is being pushed down and you are counteracting that force with a crowbar pushing it upward.
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3 years ago
How many neutrons does element X have if its atomic number is 30 and its mass number is 70?
Yanka [14]
The answer is 40.

We can solve this by finding out the number of protons, and neutrons. Atomic number of an element means the number of protons in that element. So, the atom has 30 protons if the atomic number is 30.

On the other hand, mass number is the total number of protons and neutrons, but not electrons, because they're too light comparing to the other 2. Therefore, we can simply solve the number of neutrons in the atom by subtracting the number of protons from the mass number. 70 - 30 = 40.

Therfore, the number of neutrons is 40.
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3 years ago
_____ is a measure of the quantity of matter in an object. Density Volume Mass Pressure
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Answer: Mass

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5 0
3 years ago
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lutik1710 [3]
The answer is 7. Valence electrons are the electrons in the very last shell, so we need to look at the outer “circle” and count the electrons, or the little black dots. There are 7 in the last shell.
6 0
3 years ago
Is it possible to transfer heat from a cold reservoir to a hot reservoir?
tankabanditka [31]

Answer is: B.) Yes, if work is done, this transfer process can take place.

For example,  air conditioner involves a cyclic process that transfers heat from a cold reservoir to a hot reservoir, but with use of electricity.

Thermal conductuction is the transfer of heat through physical contact. Thermal conduction is the transfer of heat by microscopic collisions of particles. Heat spontaneously flows from a hotter to a colder body.

The process of heat conduction depends on four basic factors: the temperature gradient, the cross section of the materials involved, their path length and the properties of those materials.

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3 years ago
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