CHEMISTRY HIGH SCHOOL

The element in Period 4 and Group 1 of the Periodic Table would be classified as aA. metal
B. metalloid
C. nonmetal
D. noble gas

Answers

Answer 1
Answer:

The element in period 4 and group 1 of periodic table is potassium which is a metal.

How do metallic properties vary in periodic table?

An element is said to possess metallic properties if it has 1,2,3 electrons in its valence shell as these number of electrons can be easily removed by supplying less amount of energy .

Elements present in group 1,2,3 have 1,2,3 valence electrons respectively.Hence, these elements are metals and  it is a characteristic property of metals to easily loose electrons.

Hence group 1, 2  are metals which comprises the s-block  of the periodic table.Metallic properties increases  down the group as distance between valence electrons and nucleus increases due to which they can be easily removed.

Metallic propertiesdecrease along  a period as electrons are added to same shell and hence cannot be easily removed.

Learn more about metallic properties,here:

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Answer 2
Answer: K. Pottasium is in period 4 and group 1. It would be classified as an Alkali metal, and its a metal! 
A.

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On the pH scale, a 7 indicates _____. a basean acidneutrality

which of the following are closely related to the electron configuration of an element? A. Atomic Number B. Molecular Weight C. Chemical Reactivity D. Valence Electrons

Answers

Answer:

NO:  A and B

YES:  C and D

Explanation:

A. Atomic Number         No.  This is the number of protons in the nucleus.

B. Molecular Weight      No. Protons + Neutrons

C. Chemical Reactivity   Yes.  The electron configuration allows prediction of reactivity with other elements.

D. Valence Electrons     Yes.  The most active electrons is bonding.

Explain how the scientific definition of work is different from the everyday meaning

Answers

In every day life work is a job while in scientific terms the work is a change in energy due to applied force and displacement.

Work(Job) -

In every day life, work means an specific job that is assigned to people.

For example: I work as account assistant in the company.

Work:

In scientific terms the work is a product of applied force and displacement. It is measured in Joule.

For example- the engine did the 10 J of work.

Therefore, in every day life work is a job while in scientific terms the work is a change in energy due to applied force and displacement.

To know more about Work,

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EveryDay Work(Job) - A job is like something that someone or something does to get payed for doing thatspecific job they have 

Ex: I  work at Family Dollars it's my job(That's my everyday working job)

Work(Scientific Term) - Means when force acting on body to break it down in simpler terms, Lets say that you have a marker in your hand and you drop it you've just done work as as said before "Force acting on a body". 

The elements in Period 5 on the Periodic Table are arranged from left to right in order of(1) decreasing atomic mass(2) decreasing atomic number(3) increasing atomic mass(4) increasing atomic number

Answers

Answer: Option (4) is the correct answer.

Explanation:

Atomic mass of an atom or element means the total number of protons and total number of neutrons present.

Whereas atomic number means the total number of protons present in an atom or element.

In period 5 on the Periodic Table, elements from left to right are arranged in order of increasing atomic number.

On the other hand, the atomic mass is not increasing from left to right.

Going from left to right, they are ordered by increase in atomic number

Why is salt put on icy roads and sidewalks in the winter?

Answers

so that ice would not melts and it helps to keep grip for walking or driving

Which term is defined as a measure of the average kinetic energy of the particles in a sample?(1) temperature (3) thermal energy
(2) pressure (4) chemical energy

Answers

Answer: The correct answer is Option (1).

Explanation:

Average kinetic energy is defined as the average of the kinetic energies that is associated to the particles of the sample which are in random motion.

Temperature is the measure of the average kinetic energy of the particles. Formula used for calculating the average kinetic energy is given by:

K=(3)/(2)(R)/(N_A)* T

where,

K = kinetic energy

R = Gas constant

N_A = Avogadro's constant

T = temperature

Kinetic energy is directly proportional to the temperature of the particle.

\text{Kinetic energy}\propto \text{Temperature}

As the temperature increases, the kinetic energy of the particles also increases and vice-versa.

Hence, the correct answer is option 1.
The answer is (1). Temperature is directly proportional to the average kinetic energy of the particles in any given sample of matter, and it is usually defined along those lines.

The element mercury was first discovered on the Sun.
a. True
b. False

Answers

This statement is FALSE. Mercury was not first discovered in the sun. In fact, mercury or quicksilver was discovered by ancient Indians and Chinese even before 2000 BC. Its ores that are called cinnabar are used in traditional Chinese medicines. However, the effectiveness is not yet justified because of the toxicity of the element. Mercury is also used with thermometers both in clinical and lab uses. Nowadays, the use of it in thermometers is gradually disappearing because of its harmful properties.  
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Use electron transfer or electron shift to identify what is oxidized and what is reduced in each reaction :a) 2Na(s) + Br2(l) ----> 2NaBr(s) b) H2(g) + Cl2(g) ----> 2HCl(g) c) 2Li(s) + F2(g) ----> 2LiF(s) d) S(s) + Cl2(g) ----> SCl2(g) e)N2(g) + 2O2(g) ----> 2NO2(g) f) Mg(s) +Cu(NO3)2(aq) = Mg(NO3)2(aq) + Cu(s) For each reaction above, identify the reducing agent and the oxidizing agent