the element of group 1 hour reactive but those of group 18 are inert, why?​

Answers

Answer 1

Answer:

The noble gases (Group 18) are located in the far right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence shells (octets) make them extremely nonreactive.


Related Questions

tính chất hoá học của Cu

Answers

Answer:

các oxit đồng khi nó tiếp xúc với không khí. nó phản ứng đặc biệt với oxy trong không khí (không phải hơi ẩm), và tạo ra nấm mốc

50. Carbon mono-oxide can be prepared by heating following substance with Conc. H2SO4. a. Oxalic acid b. Acetic acid c. Ethanoic acid d. All ic 252​

Answers

A

Carbon monoxide gas can be prepared in lab by heating formic acid or oxalic acid with conc. H2SO4.

Procedure: Small amount of oxalic acid crystal is taken in a round- bottomed flask and all the apparatus are fitted as shown in figure. When conc. H2SO4 is poured in the flask through thistle funnel and heated then a mixture of CO and CO2 gas is formed. The mixture of gas is passed through a bottle containing NaOH solution where the CO2 gas is absorbed by NaOH.

2NaOH + CO2 → Na2CO3 + H2O

The pure CO gas is then collected in a gas jar by downward displacement of water.

Plsss help with this ASAP TT

Answers

Answer: lithium- 3 protons, 3 electrons, 3 neutrons

Oxygen- nucleon no. 16, Atomic no. 8, 8 protons, overall charge (-2)

Sorry I don't the others. Hope this helps

which one is it…need help ASAP!!!

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The answer is the last one, D!!

True or false, The four units that must always be used when using the ideal gas are 44.0 liters

Answers

Answer:

for volume only liters can be used

Explanation:

PLZ HELP ME WITH MY WORK​

Answers

Answer:

Explanation:

pretty sure its mixure.

Mixture








I’m sure mann

Describe the principle and process for the manufractured of sulphuric acid witha a well labeled diagram by contact process.

Answers

The steps involved in the manufacture of sulphuric acid by contact process:

(1) Sulphur (or iron pyrites) are burnt in air to form sulphur dioxide.

  S+O2→SO24FeS2+11O2→2Fe2O3+8SO2

(2) Catalytic oxidation of sulphur dioxide to sulphur trioxide.

  2SO2+O2V2O52SO3ΔrHo=−196.6kJ

The reaction is reversible and exothermic.

(3) Sulphur trioxide is dissolved in 98% sulphuric acid to form oleum (fuming sulphuric acid). 

  SO3+H2SO4→H2S2O7

(4) Oleum is diluted with water to form sulphuric acid of desired concentration.

    H2S2O7+H2O→2H2SO4

            and

Manufacture of H2SO4 by contact process involves three steps:

1. Burning of sulphur in air to generate SO2.

2. Conversion of SO2 to SO3 by oxidation with air in the presence of 

Convert 84 miles to kilometers (there are 0.6 miles in a kilometer)
using the method dimensional analysis

Answers

Answer:

Explanation:

Put the given unit on the bottom of the brackets.

84 miles [tex]\frac{1 km}{0.6 miles}[/tex] = 84/0.6 = 140 km

Is water the only liquid? If not, name 5 more

Answers

Answer:

Is water the only liquid? If not, name 5 more

Water, ethanol, household bleach, blood, paint, milk, gasoline, mineral oil, acetone and butyl alcohol are examples of liquids. Liquids' properties allow them to flow or be poured easily into containers, lava

water is not the only liquid.

Answer:

apple juice, milk, smoothie, blood, urine

Which of the following is a common property of both strong acid and strong base?
a. They are good electrolytes
b. They are non-electrolytes
c. They are weak electrolytes
d. They are sour in test

Answers

Answer:

They are good electrolytes

[tex]v=0.164m*8.3cm*12.4cm[/tex]

Answers

Answer:

helloooo

0.164m * 100 = 16.4 cm

now multiplying all of em

v = 1,687.888

What is known about a reaction with a positive enthalpy?

Answers

Answer:

"Endothermic reaction: In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings of the reaction."

Explanation:

When enthalpy is positive and delta H is greater than zero, this means that a system absorbed heat. This is called an endothermic reaction. When enthalpy is negative and delta H is less than zero, this means that a system released heat. This is called an exothermic reaction.

What does a high positive enthalpy mean?

The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.

Learn more about the endothermic reaction here: brainly.com/question/6506846

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Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes leading to irreversible inactivity of these enzymes. If the amount of mercury in a polluted lake is 0.4 Hg/mL, what is the total mass in kilograms of mercury in the lake

Answers

Answer:

The total mass of mercury in the lake is 631,542.7 kg

Explanation:

Question: The given dimensions of the lake as obtained from a similar question posted online are;

The surface area of the lake, A = 100 mi²

The lake's average depth, d = 20 ft.

The concentration of the mercury, C = 0.4 μg Hg/mL = 0.4 × 10⁻⁶ kg Hg/L

Therefore, we have;

The volume of water mixture in the lake, V = A × d

∴ V = 100 mi² × 20 ft. = 2,787,840,000 ft.² × 20 ft. = 55,756,800,000 ft.³

1 ft³ = 28.31685 L

∴ 55,756,800,000 ft.³ = 55,756,800,000 ft.³ × 28.31685 L/ft.³ = 1.57885675 × 10¹² L

The total mass of mercury in the lake, m = C × V

∴ m = 0.4 × 10⁻⁶ kg Hg/L × 1.57885675 × 10¹² L = 631,542.7 kg

The total mass of mercury in the lake, m = 631,542.7 kg.

Question 2 Multiple Choice Worth 2 points)
(01.01 LC)
Which of the following is a characteristic of science?
O Reproducible by other scientists
The personal opinion of the scientist
Using vanable conditions for each test
O Including only the data that supports a hypothesis
Question 3 Multiple Choice Worth 2 points)

Answers

Answer:

Reproducible by other scientists

The personal opinion of the scientist

Using vanable conditions for each test

Explanation:

Temperature (°C) 5
Heating Curve for Water
160
140
2 120
100
80
60
40
20
0
-20
1 2 3 4 5 6 7
Time (min)
8
9
10
At what temperature does the solid start melting?
0 -20°C
0°C
20°C
80°C

Answers

Answer:

Showing results for Temperature (°C) 5 Heating Curve for Water 160 140 2 120 100 80 60 40 20 0 "-20" 1 2 3 4 5 6 7 Time (min) 8 9 10 At what temperature does the solid start melting?

Can someone plz help me :<

Answers

Answer: cats r alliens because they r kind of like ufos they would usually wonder around rather u know it or not when they spy on us it could b with us sleep cooking anything so they r like aliens

Explanation:

I need help with b) c) and what is the electronic configuration of atom E

Answers

Answer:

(b) A and C belongs to same group.

(c) D is a non metal.

Explanation:

The Electronic Configuration of E is

[tex]1s {}^{2} 2s {}^{2}2p {}^{6} 3s {}^{2} 3p {}^{6} 4s {}^{2} [/tex]

At what approximate temperature and pressure can all three phases of water exist simultaneously?

0°C, 760 mmHg
0°C, 5 mmHg
80°C, 380 mmHg
100°C, 760 mmHg

Answers

Answer:

0⁰c , 5 mmHg

Explanation:

Because at this temperature we all know water can be in state of both solid and liquid and when pressure is decreased it can be in form of gas too

7. What measures are applicable in the context of Nepal to push energy crisis further. Describe any three points clearly.​

Answers

Answer:

which energy?........

Explanation:

..........................

........

....

05) Identify the statement that is true about atoms as they pass through the rock cycle. a. Those that were adjacent to each other remain near each other. b. They do not move through the rock cycle at the same rate. c. They move through the rock cycle in the same manner. d. They stay within the same mineral.

Answers

Answer:

b. They do not move through the rock cycle at the same rate

Explanation:

The rock cycle is the phenomenon used to describe the interrelation of the three forms in which rocks exists, and a rock is changed between forms due to the Earth's geologic process, such as erosion, weathering and plate tectonics

The rock cycle involves both chemical and physical transformation of rocks and therefore, the atoms and compounds make and cut connections, such that the rate at which each atom move through the rock cycle at different rate

the ___ of a chemical reaction shows how much product was actually made compared with the amount of product that was expected.
O A. actual yield
OB. percent yield
OC. atom economy
D. exponential yield

Answers

ANSWER

a. actual yield

Explanation:

The amount of product generated by a chemical reaction is its actual yield. This yield is often less than the amount of product predicted by the stoichiometry of the balanced chemical equation representing the reaction (its theoretical yield).

Question 10 of 10 A certain seed is surrounded by a sticky coating. It is fairly dense and does not float in water. How is this seed most likely spread?
A. It is dispersed by the wind, and it sprouts after it falls to the ground
B. It drops to the bottom of a body of water, where it sprouts.
C. It attaches to the fur of an animal, and it sprouts after it falls from the animal's fur.
D. Animals eat it, and it is deposited in their waste. ​

Answers

The answer is C

It attaches to the fur of an animal, and it sprouts after it falls from the animal’s fur.

What process is used to refine aluminum from its ore bauxite?

A. Electrolysis
B. Electrolytic oxidation
C. Voltaic cell processing
D. Smelting

Answers

The correct option for the process used to refine aluminum from its bauxite ore is option D.

D. Smelting

The reason why smelting is the correct choice is as follows;

Bauxite is the aluminum ore from which alumina, also known as aluminum

oxide, Al₂O₃, is produced. Bauxite is extracted from the topsoil regions of

some subtropical and tropical regions, and the Bayer process is primarily

then used to produce alumina from the bauxite.

Aluminum is produced from the alumina by an aluminum smelting process

known as the Hall—Heroult electrolytic process which involves the use of a

carbon anode and direct current to produce aluminum by reducing the

aluminum oxide

Learn more about smelting process here:

https://brainly.com/question/3444206

write an importance of endothermic reactions​

Answers

Answer:

the uses of exothermic reactions are:

1) lighting of stove

2) self heating cans

3) hand warmers

4) in some case exothermic process can be used to cook food such as rice  (by adding calcium oxide to water heat is evolved and it helps to cook food )

Explanation:

hope this helps you pls mark me as brainilst

Which equation describes a physical change? i. H2O(s) ⟶ H2O(l) ii. Na+(aq)+Cl−(aq) +Ag+(aq)+NO3−(aq) ⟶ AgCl(s)+Na+(aq)+NO3−(aq) iii. CH3OH(g)+O2(g) ⟶ CO2(g)+H2O(g) iv. 2H2O(l) ⟶ 2H2(g)+O2(g) v. H+(aq)+OH−(aq)⟶ H2O(l)

Answers

Answer:

The answer is "Option i"

Explanation:

In this question, only option (i) is correct, and others were wrong which can be defined as follows:

In option (ii):

[tex]Na^+\ (aq)+Cl^- \ (aq) +Ag^+ \ (aq)+NO_3^- \ (aq) \to AgCl\ (s)+Na^+ \ (aq)+NO_3^-\ (aq) \\\\[/tex]

It is the complete ionic equation.

In option (iii):

[tex]CH_3OH\ (g)+O_2\ (g) \to CO_2\ (g)+H_2O\ (g)[/tex]

It is the combustion reaction but a not balanced equation.

In option (iv):

[tex]2H_2O\ (l) \to 2H_2\ (g)+O_2\ (g)[/tex]

It is the  decomposition equation.

In option (v):

[tex]H^+\ (aq) +OH^-\ (aq)\to H_2O\ (l)[/tex]

It is the complete ionic equation.

Identify an element as a metal or a non-metal according to its position in the Periodic
Table

Answers

Answer:

Metals on the left of the Periodic Table.

Non-Metals on the top-right, plus Hydrogen.

distinguish between sugar and non-sugar with examples.

Answers

Answer:

Reducing sugars are sugars where the anomeric carbon has an OH group attached that can reduce other compounds. Non-reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds. ... Maltose and lactose are reducing sugars, while sucrose is a non-reducing sugar

pls answer this guys

love yall

Answers

Answer:

wat

Explanation:

Answer:

Basic ABCHope it helps..

define measurment and its importance ​

Answers

Answer:

Explanation:

A measurement is the action of measuring something, or some amount of stuff. So it is important to measure certain things right, distance, time, and accuracy are all great things to measure. By measuring these things or in other words, by taking these measurements we can better understand the world around us.

Answer:

Measurement is the process of comparison of an unknown physical quantity with a known physical quantity.

It is important because measurement is needed in every day life we need measurement in simply cooking food to designing a house and many more other works.

Explanation:

hope this helps you.

Explain whether changing the ratio of baking soda and vinegar changes the amount of carbon dioxide produced. Include the evidence you used to reach your conclusion.

Answers

On changing the ratio of baking soda and vinegar changes the amount of carbon dioxide produced is true, because each species will depends on both reactants.

What is chemical reaction?
Chemical reactions are those reactions in which reactants are mixed with each other for the formation of new product.

Chemical reaction between baking soda and vinegar is shown below in the attached image in which the formation of carbon dioxide, water and sodium acetate takes place. So the formation of carbon dioxide depends on the baking soda and baking soda reacts with vinegar to form sodium acetate so change in the ratio will changes the amount of carbon dioxide.

Hence on changing the ratio of reactants and vinegar changes the amount of carbon dioxide.

To know more about chemical reactions, visit the below link:

https://brainly.com/question/26018275

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The difference in hour between full-time and part-time who work 5 hours a day is 2 working hours. How many hours per day do full-timers work? Read the following sentences and write the correct reflexive pronoun in the blank. 1. Mara ________ cas el domingo. ________2. Yo ________ puse alegre con las noticias. ________3. Mis hermanos ________ enojaron cuando su equipo perdi. ________4. Nosotros ________ divertimos durante el campeonato. ________5. Yo ________ aburr mucho en el ballet. ________6. Juan ________ durmi durante el partido ayer. ________ 7. T ________ volviste loco cuando ganaste. _________ Complete the following sentences using the future tense verbs. 1. (hacer) Yo ________ la tarea esta tarde. 2. (tener) Mis primos ________ muchas opurtunidades en ese trabajo.3. (saber) Nosotros ________ la verdad despus de unos minutos.4. (poder) Ricardo ________ contarnos unos chistes.Complete the following sentences using the present subjunctive of the ir stem-changing verbs. 1. (repetir) Los turistas quieren que la gua __________ la explicacin.2. (pedir) Es necesario que ustedes __________ ayuda. 3. ( seguir) Es importante que nosotros __________ las instrucciones.4. (dormir) Es mejor que Felipe y Ana __________ en el avin. What is the quadratic regression equation that fits these data? Who was Dr. Joseph Bell? the countries of the temperate and cold climate are comparitively more developed. why? What is the axis of symmetry for the graph of y 4x = 7 x2 ? hdjehhwhehbwbwnnwnwnjejdiidjsnnwnnwnrnfjfjjdjejnwnnrnfnfjjjw Determine which of the following statements is true about energy in ecosystems. A. Producers are able to convert 40% of the suns energy into chemical energy. B. 30% of the suns energy cannot be absorbed by producers because it is in the wrong wavelength of light. C. Producers only absorb 40% of the suns energy, most of which is lost during photosynthesis. D. Producers absorb 5% of the suns energy, and reflect 5% of the suns energy. Trucker's Heaven Diner uses hundreds of plates, glasses, and cups each day. The dishwashers start a new load of dishes every 1 1/4 hours. If the dishwashers work for 10 hours . How many loads off dishes do they wash in that time?A: 1/2B: 8C: 8 3/4D: 12 1/3 Question 10 of 10 Why was it unusual that African Americans supported FDR? O A. FDR was white, and most African Americans only voted for black candidates. O B. FDR was a Democrat, and most African Americans voted Republican. O C. FDR was from the North, and most African Americans voted only for Southerners. O D. FDR was a Democrat, but southern Democrats opposed him. Del texto Pedro Paramo, extrae:1. Una oracin interrogativa2. Una oracin exclamativa3. Una oracin imperativa4. Una oracin enunciativa afirmativa5. Una oracin enunciativa negativa g An Hfr strain is produced when Select one: A. an F episome is transferred to a new cell. B. an F episome leaves the E. coli chromosome. C. an F episome leaves the host chromosome and removes some of the host chromosome. D. an F episome integrates into the E. coli chromosom 2 What are the major challenges to tackle your district? Consider the reaction: CaCO3(s)CaO(s) CO2(g) Using standard absolute entropies at 298K, calculate the entropy change for the system when 1.58 moles of CaCO3(s) react at standard conditions. A shunt regulator utilizing a zener diode with an incremental resistance of 8 ohm is fed through an 82-Ohm resistor. If the raw supply changes by 1.0 V, what is the correspondig change in the regulated outut voltage? The Lecompton Constitution was the: a. pro-secession constitution of North Carolina. b. proslavery constitution proposed for Kansas. c. compromise offered in 1861 to end the secession crisis. d. Missouri constitution preferred by Abraham Lincoln. e. antislavery constitution adopted in Nebraska. What is the difference between the temperature - 7 Celsius and - 12 Celsius on a scatter diagram Tracy and Veronica are intense, bitter track rivals. Tracy was once motivated to be the best runner she could be. However, she has lost her zeal to be her best. Now her singular goal when she races is simply to beat Veronica! Her goal can best be described as The article source and supplementary information compare p-toluenesulfonic acid and Amberlyst-15 as catalysts that can be used to synthesis Methyl Diantilis. In a paragraph please summarize and explain the differences between these two catalysts. This summary should include both differences of chemical principles and laboratory practicality. Which expression is equivalent to the following complex fraction?