Which of the following provide information about the shape of an orbital a: n=1 b 1, 2, 3, 4 c n=2 d s, p,

QUESTION POSTED AT 14/02/2020 - 04:56 PM

Answered by admin AT 14/02/2020 - 04:56 PM

S, P. S is a sphere P is an infinity
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Related questions

Question 1 what happens during a neutralization reaction?

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.

  • New substances called SALTS and water are formed in neutralization reactions.
  • For example, hydrochloric acid and sodium hydroxide solution react together to form water and sodium chloride solution. The H+ ions and OH– ions produce the water, and the Na+ ions and Cl– ions produce the sodium chloride, NaCl(aq).

ANSWERED AT 28/02/2020 - 05:11 PM


QUESTION POSTED AT 28/02/2020 - 05:11 PM

Amino acids cannot be broken down to provide energy.

False, Dietary proteins are first broken down to individual amino acids by various enzymes and hydrochloric acid present in the gastro-intestinal tract. These amino acids are further broken down to α-keto acids which can be recycled in the body for generation of energy, and production of glucose or fat or other amino acids.

ANSWERED AT 28/02/2020 - 04:42 PM


QUESTION POSTED AT 28/02/2020 - 04:42 PM

An atom of an element has 28 innermost electrons and 7 outermost electrons. In which period of the Periodic Table is this element located? 1. 5 2. 2 3. 3 4. 4

Answer: The given element belongs to Period 4.

Explanation:

We are given:

Number of innermost electrons = 28

Number of outermost electrons = 7

Total number of electrons = 28 + 7 = 35

Electronic configuration is defined as the representation of electrons around the nucleus of an atom.

Number of electrons in an atom is determined by the atomic number of that atom.

The electronic configuration of the element having atomic number '35' is:  1s^22s^22p^63s^23p^64s^23d^{10}4p^5

To identify the period, we look at the highest occupied principle quantum number which is 'n'. Here, the value of highest occupied shell or 'n' is 4.

Hence, the given element belongs to Period 4.

ANSWERED AT 28/02/2020 - 03:57 PM


QUESTION POSTED AT 28/02/2020 - 03:57 PM

A cell's ____________ contains all the information necessary to direct the cell.

The dna contains all the information.

ANSWERED AT 28/02/2020 - 03:21 PM


QUESTION POSTED AT 28/02/2020 - 03:21 PM

Why is aluminium in group 3 of the periodic table?

Aluminum has an atomic number 13

electronic configuration= 2,8,3

we know
period number signifies the number of orbits in an atom.

aluminum has 3 orbits
therefore AL is in period 3

ANSWERED AT 28/02/2020 - 01:55 PM


QUESTION POSTED AT 28/02/2020 - 01:55 PM

Can someone please help me on number 2 I am really stuck.

A longitudinal wave. I'm 100% sure.

Hope this helps!

ANSWERED AT 28/02/2020 - 11:48 AM


QUESTION POSTED AT 28/02/2020 - 11:48 AM

One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body? A. 1 kilogram B. 500 grams C. 250 grams D. Practically none

The human body contains many salts, of which sodium chloride NaCl is the major one, making up around 0.4 per cent of the body's weight. So a 50kgperson would contain around 200g of sodium chloride - around 40 teaspoons. Since we lose salt whenever we sweat, it has to be continually replaced. Answer: C.

ANSWERED AT 28/02/2020 - 11:44 AM


QUESTION POSTED AT 28/02/2020 - 11:44 AM

Elements and compounds are 2 types of what?

Compounds. ... When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl). Hope it helped!

ANSWERED AT 28/02/2020 - 11:40 AM


QUESTION POSTED AT 28/02/2020 - 11:40 AM

If a 40 kg person is accelerating at m/s^2,then the magnitude of force acting on him or her 400 N? true or false

 F = ma = 40kg * 10m/s^2 = 400 kg-m/s^2 = 400N

ANSWERED AT 28/02/2020 - 11:35 AM


QUESTION POSTED AT 28/02/2020 - 11:35 AM

Why is activation energy required to start some reactions? A.)to break the bonds of an endothermic reaction B.)to overcome electron repulsion of an endothermic reaction C.)to overcome electron repulsion of an exothermic reaction D.)to provide sufficient energy to keep a reaction going

Answer: D.) to provide sufficient energy to keep a reaction going

Explanation:

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.  It is required for both endothermic and exothermic reactions.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.

ANSWERED AT 28/02/2020 - 11:30 AM


QUESTION POSTED AT 28/02/2020 - 11:30 AM

How many grams of NH3 are needed to provide the same number of molecules as in 0.15 grams of SF6

Moles of SF6 = 0.15/molar mass of SF6 = 0.15/146.06 = 1.02 x 10⁻³ moles.
Moles of NH3 = Moles of SF6 = 1.02 x 10⁻³ moles.

Therefore mass of NH3 = moles of NH3 x molar mass of NH3 
                                       = 1.02 x 10⁻³ x 17.03
                                       = 0.017 grams.

ANSWERED AT 28/02/2020 - 10:40 AM


QUESTION POSTED AT 28/02/2020 - 10:40 AM

Which electron configuration represents an excited state for an atom for calcium 1. 2-8-7-1 2. 2-8-7-2 3. 2-8-7-3 4. 2-8-8-2

The electron configuration that represent an excited state for an atom of calcium is 2, 8, 7, 3.

Calcium atom has an atomic number of 20 and its electronic configuration is 2, 8, 8, 2. An atom is said to be in an excited state if it gains energy and move to an higher energy level. For the calcium atom given above, there are 20 electrons which are distributed into four shells. But in the excited state [option 3], one of the 8 electrons in the third shell gains energy and move to the fourth shell. Thus, the number of electrons in the third shell reduced by 1, while the number of electrons in the fourth shell increase by 1.

ANSWERED AT 28/02/2020 - 07:01 AM


QUESTION POSTED AT 28/02/2020 - 07:01 AM

What is the complete ionic equation MgSO4 + 2NH4OH = Mg(OH)2 + (NH4)2SO4

Mg(aq) + 2OH(aq) -> Mg(OH)2
Don't forget the charge of ions

ANSWERED AT 28/02/2020 - 06:26 AM


QUESTION POSTED AT 28/02/2020 - 06:26 AM

HELLLLLLLLPPP Which of the following statements accurately describes renewable energy sources? They include fossil fuels and hydroelectric power. They take millions of years to form and should be used responsibly. They provide the majority of the energy for the United States. They are found in nearly limitless supply. QUESTION 2 Over the past 100 years, the amount of fossil fuel consumption has ___________. increased decreased stayed the same fluctuated QUESTION 3 One-quarter of the world’s coal reserves are found in what country? Russia Saudi Arabia Mexico United States

Answer:

1. They are found in nearly limitless supply.

Renewable resources are those which are abundantly present in nature and can be replenished again after single use. For example water, air and  sunlight.

2. increased

Over the past 100 years, the amount of fossil fuel consumption has increased because with the increase in the population cover all over the world, the requirement of fossil fuels is also increasing. Fossil fuels are required for the generation of thermal and electrical energy.

3. United States

The United States is the reservoir of coal. It is a chief exporter of the coal to India, Netherlands , Japan, South Korea and Brazil.

ANSWERED AT 28/02/2020 - 05:54 AM


QUESTION POSTED AT 28/02/2020 - 05:54 AM

PH is the a measure of the 1) concentration of hydrogen ions in solution 2) concentration of compounds in solution 3) concentration of OH- in solution

The correct answer is:

1) Concentration of hydrogen ions in solution

- I can verify this is correct because I took the test.

ANSWERED AT 28/02/2020 - 04:27 AM


QUESTION POSTED AT 28/02/2020 - 04:27 AM

Exit which of the following is true of gases? a. they have a definite shape. b. they have a definite volume. c. they have a relatively high density. d. they have the ability to diffuse through other gases.

They dont have definite shape, high density and volume.

But they can be mixed together very easily

hope you got your answer

ANSWERED AT 28/02/2020 - 03:37 AM


QUESTION POSTED AT 28/02/2020 - 03:37 AM

Which of the following substances is an Arrhenius acid? BF3 HCN NH3 Mg(OH)2

Answer:

  • Correct answer is HCN.

Explanation:

According to Arrhenius

  • Acid is a substance which give Hydrogen ion in aqeous solution while base is a substance that give hydroxyl ion into aqeous solution.

As in this case of HCN, it hydrolyse into cyanide and hydrogen ion knwon as arrhenius acid.

  • BF3 is lewis acid
  • NH3 is lewis base
  • Mg (OH)2 is base , not acid

ANSWERED AT 27/02/2020 - 01:31 PM


QUESTION POSTED AT 27/02/2020 - 01:31 PM

What is the concentration of nitrate ion in a 425 mL solution containing 32.0 g of Mg(NO3)2 (M = 148.3)?

Mg(NO3)2 ➡️ Mg2+ + 2 NO3-

(32.0g Mg(NO3)2) / (148.3g Mg(NO3)2/mol)* (2 mol NO3- / 1 mol Mg(NO3)2) / (0.425 L) = 1.02 mol/ L NO3-

ANSWERED AT 27/02/2020 - 11:38 AM


QUESTION POSTED AT 27/02/2020 - 11:38 AM

The volume of 1 mole of gas at STP is called the

At STP, one mole of gas has a volume of 22.4 L

This is called the standard molar volume, and is true for a mole of any ideal gas at STP


ANSWERED AT 27/02/2020 - 11:27 AM


QUESTION POSTED AT 27/02/2020 - 11:27 AM

3,3,4-trimethylhexane, 2,3-dimethyl-2-butene, and 3-methyl-1-butyne identify as an alkane, alkene, or alkyne and sketch its structures I need help asap!

The first one is an alkane, the second is an alkene, and the third is an alkyne. The suffix of the compound tells you what kind of hydrocarbon it is.

ANSWERED AT 27/02/2020 - 11:25 AM


QUESTION POSTED AT 27/02/2020 - 11:25 AM

I need help with #3 name the compound

4-ethyl-3-methyl 1 hexane

ANSWERED AT 27/02/2020 - 11:23 AM


QUESTION POSTED AT 27/02/2020 - 11:23 AM