CHEMISTRY HIGH SCHOOL

Which best explains the relationship between parent rock and soil

composition?

Answers

Answer 1
Answer: Soil is partially the result of the physical and chemical weathering of its parent rock. The minerals found in the soil were either in that parent rock, or they were formed from the weathering products of the parent rock.

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Gases and liquids will both expand to fill their container true or faulse
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure. How many grams of N2 must react to form 1.7 grams of ammonia, NH3? 0.0058 g .052 g 1.4 g 2.8 g
In which equation does the term "heat" represent heat of fusion?(1) NaCl(s) + heat -->NaCl(l)(2) NaOH(aq) + HCl(aq) -->NaCl(aq) + H2O(l) + heat(3) H2O(l) + heat --> H2O(g)(4) H2O(l) + HCl(g) -->H3O+(aq) + Cl-(aq) + heat
A solution with a pH of 8.0 isa. acidic. b. neutral. c. weakly basic. d. strongly basic.
An atom has 11 protons, 12 neutrons, and 11 electrons. what is the charge of the atoms nucleus?A) +11B) -11C) 0D) 23

Given the following two thermochemical equations, H2(g) + ICI(8) HCl(g) + HI(g) AH° = -83.1 kJ = 12(8) + HCl(g) HI(g) + ICI(8) AH° = 73.6 kJ determine the standard enthalpy change associated with the following reaction: H2(g) + 21C1(g) 2HCl(g) + 12(9) AH° = ? -9.5 kJ -283.0 kJ O 156.7 kJ 0 -156.7 kJ O 9.5 kJ

Answers

Answer:

draw line DM perpendicular to ab

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

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

39 Which formula represents a molecule with the most polar bond?(1) CO (3) HI
(2) NO (4) HCl

Answers

Answer: (1) CO

Explanation: A molecule is said to be polar when it has atoms with different electronegativities. The more is the difference in electronegativity, the more polar is the bond.

Electronegativity of carbon and oxygen are 2.5 and 3.5 respectively. Thus difference is (3.5-2.5)=1.0.

Electronegativity of hydrogen and Iodine are 2.1 and 2.7 respectively. Thus difference is (2.7-2.1)=0.6.

Electronegativity of nitrogen and oxygen are 3.0 and 3.5 respectively. Thus difference is (3.5-3.0)=0.5.

Electronegativity of hydrogen and chlorine are 2.1 and 3.0 respectively. Thus difference is (3.0-2.1)=0.9.

Thus as the highest difference of electronegativity is among carbon and oxygen, CO is the most polar.

Which formula represents a molecule with the most polar bond? (1) CO (3) HI (2) NO (4) HCl

The formula that represents a molecule with the most polar bond is the HCl, hydrochloric acid. The answer is number 4.

How is controlling the rate of a chemical reaction useful to a chemical engineer, physician and chef?

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It should be noted that controlling the rate of a chemical reaction is useful to the professions to improving production.

What is a chemical reaction?

It should be noted that a chemicalreaction simply means the process by which substances are converted to another substance.

In this case, controlling the rate of a chemical reaction is useful to the professions to improving production.

By finding out how fast products are made, one can develop methods to into such production.

Learn more about chemical reaction on:

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Controlling the rate of chemical reactions is crucial to a chef because that is what gives food its flavor. Bread that rises too fast or slow (yeast cells converting glucose into carbon dioxide) will taste awful compared to correctly risen bread. Flambé undergoes a very fast, but brief, chemical reaction when the alcohol in which it is smothered is ignited, caramelizing the creme on top. A slow reaction would melt it all, while an even faster reaction could cause the dish to explode.

A bus traveled 280 kilometers between two cities . It left the first city at 3:00 p.m. and arrived at the second city at 7:00 p.m. What was the average speed of the bus during the trip ?

Answers

Answer:

70 kilometers per hour

Explanation:

280 kilometers ÷ 4 hours (7:00 pm - 3:00 pm = 4 hours) = 70 kilometers per hour

Hope this helps! Sorry if wrong. You are loved and you are beautiful/handsome!

-Bee

During the operation of a voltaic cell, the cell produces1) electrical energy spontaneously
2) chemical energy spontaneously
3) electrical energy nonspontaneously
4) chemical energy nonspontaneously

I need some help with this one ?

Answers

The answer is 1) electrical energy spontaneously

A voltaic cell is an electrochemical cell driven by a spontaneous chemical reaction and produces an electrical energy. The general form of reaction is
                     reagents → products + electrical energy.
This reaction is spontaneous.

However, the reverse reaction is nonspontaneous and it requires electrical energy.
Other Questions
How many phosphorus atoms are there in 1.75 mol of calcium phosphate,Ca3(PO4)2
1-Propanol is combusted to provide heat. The equation and the enthalpy change for the process are shown below. C₃H₇​OH(l)+4.5O₂​( g)→3CO₂​( g)+4H₂​O(l)ΔH=−2,021 kJ Below is a list of sentences that describe a chemical process. Choose all of the sentences that apply to the above rea Check all that apply. a This process is exothermic. b The enthalpy change for 2C₃H₇​OH(l)+9O₂​( g)→6CO₂​( g)+8H₂​O(l) is 2,021 kJ c The enthalpy change for 2C₃H₇​OH(l)+9O₂​( g)→6CO₂​( g)+8H₂​O(l) is −4,042 kJ d The enthalpy change for 2C₃H₇​OH(l)+9O₂​( g)→6CO₂​( g)+8H₂​O(l) is −2,021 kJ e This chemical process transfers heat from the surroundings to the system. f The enthalpy change for 2C₃H₇​OH(l)+9O₂​( g)→6CO₂​( g)+8H₂​O(l) is 4,042 kJ g This process is endothermic. h This chemical process transfers heat from the system to the surroundings.
The distance from santa maria to los alamos is 16.25 mi. What is the distance in cm?
1. Some redox reactions are also classified as which of the following?A) acid-base B) synthesis C) single-displacement D) decomposition 2. If ions change places and a gas is formed, then what type of reaction is indicated? A) double-displacement B) synthesis C) decomposition D) single-displacement