CHEMISTRY MIDDLE SCHOOL

An element contains only one kind of A.) particle.
B.) property
C.) protein
D.) raw material

Answers

Answer 1

Answer:

Answer:

particle

Explanation:

if there were more than one kind of particle, it would be a compound.

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These models show the electron structures of two different nonmetal elements.Which element is likely more reactive, and why?

A.) Element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table.

B.) Element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table.

C.) Element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons.

D.) Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

Answers

Answer: Option (D) is the correct answer.

Explanation:

Valence shell is the shell present on the outermost core of an atom and electrons present in the valence shell are known as valence electrons.

If an atom has completely filled valence shell then it means the atom is not reactive in nature because it is already stable.

But when an atom has less than eight electrons in its valence shell then it means to attain stability the atom will readily attract electrons towards itself.

As the given element 1 has 8 electrons in its valence shell. Hence, it is not reactive in nature but element 2 has 6 valence electrons. So, in order to attain stability element 2 will readily attract 2 electrons from a donor atom.

Thus, we can conclude that element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

Answer:

Its D

Explanation:

I got it right on the test

What is the comound name for the formula PbCl2?

Answers

Lead (II) chloride
......................................
Chlorine has a charge of -1 and lead can have a charge of +2 or +4
The charges need to be balanced, so if lead was +4 then the equation would be PbCl4, because chlorine needs 4 atoms to balance out lead. Because it was Cl2, we know it was lead (II)

Before you touch a wire in an appliance how should you make sure that it is not energized

Answers

Answer:by checking for voltage with a neon tester

Explanation:

Hey There!

The device used to determine if there is energy in a wire is called a clamp meter, this device would detect if there are any presents currents in the wire. In order to use this device, you would simply have to attach it on the wire you are testing for.

Another device used to detect energy from wires is called a a non-contact voltage detector. While this device does not operate on all types of wires, it is solely created for AC circuits. Though, it is not preferred to manage the wire as this device sometimes proves to not be very reliable.

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What is volume? What instrument is used to measure liquid volume? What formula is used to calculate the volume of a solid object.

Answers

We are required to explain the meaning of volume and mention the instrument used to measure liquid volume.

Volume refers to the unit of three-dimensional measure of space that comprises of a length, a width and a height. It is measured in units of cubic centimeters(cm³), cubic inches(in³) or cubic feet(ft³).

An instrument used to measure liquid volume is called a graduated cylinder or a buret.

Since, volume comprises of length, width and height, then the formula used to calculate the volume of a solid object is length multiplied by width multiplied by height.

Therefore,

Volume of a solid object = Length × Width × Height

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Answer:

Volume is the amount of space that a substance occupies. A graduated cylinder is used to measure liquid volume. The formula used to calculate the volume of a solid object is = L x W x H

Explanation:

what does diving 30m below sea level affect our bodies more then being in a building 30m above sea level?

Answers

Because of the pressure. No oxygen in the water, however there is oxygen above the sea level. Thus, causing pressure to our bodies.

Which statement describes a reversible reaction at equilibrium?(1) The activation energy of the forward reaction must equal the activation energy of the reverse reaction.
(2) The rate of the forward reaction must equal the rate of the reverse reaction.
(3) The concentration of the reactants must equal the concentration of the products.
(4) The potential energy of the reactants must equal the potential energy of the products.

Answers

Answer: The correct answer is Option 2.

Explanation:

Reversible reaction is defined as the reaction in which the products formed react together to give the reactants back. For general reversible chemical equation:

$aA+bB\rightleftharpoons cC+dD$