the element is nitrogen
5+2=7
Several important physical needs that organisms receive from the environment are:
water, minerals, carbon dioxide, and oxygen
the balance of nature, minerals, carbon dioxide, and oxygen
wind, minerals, carbon dioxide, and oxygen
Answer:
water,minerals carbon dioxide, and oxygen
Explanation:
We answered it on my little brothers quiz, and we got a 100%!!!
Why do electronegativity charts often give no values to the group 18 elements?
Answer:
Because they have complete electronic configuration
Explanation:
Group 18 elements are known as the noble or inert gases. The elements in this group are non-reactive because they have complete electronic shell configuration.
Electronegativity is the tendency of an atom to attract electrons. The reason why atoms attracts electrons is to have a stable configuration like those of the noble gases. Since the noble gases do not require any extra-electrons to attain stability, they have 0 electronegative values.If I place a balloon in my fridge that initially has a pressure of 1.02 atm and a
temperature of 11.2 °C, what will be the pressure (in atm) of the balloon when it is
fully cooled to 4.00°C by my refrigerator?
Answer:
P₂ = 0.99 atm
Explanation:
Given data:
Initial pressure = 1.02 atm
Initial temperature = 11.2°C
Final pressure = ?
Final temperature = 4.00°C
Solution:
Initial temperature = 11.2°C (11.2+273 = 284.2 K)
Final temperature = 4.00°C (4.00+273 = 277 K)
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
1.02 atm / 284.2 K = P₂/277 K
P₂ = 1.02 atm × 277 K / 284.2 K
P₂ = 282.54 atm. K /293 K
P₂ = 0.99 atm
Which best describes why NH4+ can form an ionic bond with CF?
Its outermost shell gains one or more electrons from CF.
Its positive charge is attracted to the negative charge of Cr.
It has a negative charge that is spread over the entire ion.
It has a nitrogen atom that is strongly attracted to Cr.
Answer:
Its positive charge is attracted to the negative charge of Cl-
Note: The correct question is given below:
Which best describes why NH4+ can form an ionic bond with Cl-?
Its outermost shell gains one or more electrons from Cl-.
Its positive charge is attracted to the negative charge of Cl-.
It has a negative charge that is spread over the entire ion.
It has a nitrogen atom that is strongly attracted to Cl-.
Its positive charge is attracted to the negative charge of Cl-.
Explanation:
An ammonium ion is a positively charged ion which is composed of a molecule of ammonia and a hydrogen ion which are in a coordinate covalent bond due to the lone pair of electrons of the nitrogen atom in the molecule ammonia. The chloride ion however, has an extra electron which gives it a negative charge.
An ionic bond is formed between two oppositely charged ions by a transfer of electrons from one atom to another. It usually occurs between non-metals and metals. However, that formed between ammonium ion and chloride ion is between non-metals entirely.
Due to electrostatic attraction between the oppositely charged ions, an ionic bond is formed between ammonium ion, NH4+, and chloride ion, Cl-.
Which terms are used to identify pure substances?
Answer:
mabey c or d
Explanation:
color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.
Need help please with this, I’ll give brainliest!!!
Answer:
38 g?
Explanation:
I'm not entirely sure, but perhaps it is 49 grams x 78.25%? This gives you an answer of 38 g using significant figures.
How many grams of aluminium chloride are produced when 123.2g of chlorine react with aluminium
Answer:
Mass = 154.67 g
Explanation:
Given data:
Mass of aluminum chloride produced = ?
Mass of chlorine = 123.2 g
Solution:
Chemical equation:
2Al + 3Cl₂ → 2AlCl₃
Number of moles of chlorine:
Number of moles = mass/molar mass
Number of moles = 123.2 g/ 71 g/mol
Number of moles =1.74 mol
Now we will compare the moles of aluminum chloride and chlorine.
Cl₂ : AlCl₃
3 : 2
1.74 : 2/3×1.74 = 1.16 mol
Mass of AlCl₃:
Mass = number of moles × molar mass
Mass = 1.16 mol × 133.34 g/mol
Mass = 154.67 g
How many moles of hydrogen
are in 3.7 moles of C8H11 NO2?
Is PH3 polar or nonpolar
Phosphine is an example of a polar molecule with non-polar bonds
Distinguishing Types of Waves through Examples
A 2-column table with 3 rows. The first column labeled mechanical waves has entries ocean water, light waves, earthquake waves. The second column labeled electromagnetic waves has entries sound waves, radiation waves, X-ray waves.
How should the table be changed to correctly distinguish between mechanical and electromagnetic waves?
Earthquake waves and radiation waves need to change places.
Light waves and X-ray waves need to change places.
Ocean waves and X-ray waves need to change places.
Sound waves and light waves need to change places.
Answer:
Sound waves and light waves need to change places.
Explanation:
Given table:
Mechanical waves Electromagnetic waves
Ocean water Sound waves
Light waves Radiation waves
Earthquake waves X-ray waves
From the given table, to be correct, light and sound waves must change their position.
Light wave is an electromagnetic wave
Sound wave is a mechanical wave
An electromagnetic wave does not require a material medium for propagation.
Mechanical waves require material medium for their propagation.
Mechanical waves Electromagnetic waves
Ocean water Light waves waves
Sound waves Radiation waves
Earthquake waves X-ray waves
Answer:
Sound waves and light waves need to change
Explanation:
Elsa is making a grilled ham-and-cheese sandwich. She uses a 20-gram slice of cheese, 40 grams of sliced ham, and two 15-gram slices of bread. After she heats the sandwich on a griddle, the cheese is melted. What will be the mass of her sandwich?
90 grams. When the state of an object changes, the mass doesn’t change.
*edited*
Convert the measurement into scientific notation. 1.25ml
Answer:
The number "1.25" is already at a number that shouldn't be determined using scientific notation. Do you want 1.25ml----> liters ? If so, here
Explanation:
1.25 × [tex]10^{-3}[/tex]
is the amount of liters
Hope this helps!
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2. The energy of motion is called
energy.
A. potential
B. electrical
C. chemical
D. kinetic
Answer:
Kinetic energy
Explanation:
The digestive system is a group of organs working together to...
can somebody help with this please ?
Answer:
B. Molecules of different types of atoms that are not attracted to each other.
Explanation:
On a broad basis, matter can be subdivided into pure or distinct substances and impure substances (mixtures);
Pure substances are distinct substances having the following properties:
All parts are the same throughout Composition is definite They cannot easily be separated or broken down into simpler substances by physical means. Separation by physical methods is not easy. They have a unique set of physical properties.From this criteria, we see that the second choice is nullified. This is because pure substances have their molecules attracted to each other.
How does the suns energy contribute to the movement of water in the water cycle?
Answer:Evaporation
Explanation:
The suns heat speeds the movement of water molecules, until the molecules move fast enough that they jolt out the surface of the water individually. Overtime the water gradually evaporates into water vapor.
helpp!! only answer if u know or think u know!
ILL MARK U BRAINLIEST
this is science btwww
Answer:
answer on what no file attached
Explanation:
Answer:
Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. All magma develops underground, in the lower crust or upper mantle, because of the intense heat there. first question Natural non-living things: They are found in nature and are not made by man. Examples: Sun, moon, stars, sky, clouds, rocks, mountains and many more. Man-made non-living things: They are made by man. Examples: Toys, chairs, tables, beds, houses, buildings, trains and many more. second question Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock. The parent rock can be either sedimentary, igneous, or even another metamorphic rock. The word "metamorphic" comes from Greek and means "To Change Form". third question. Sedimentary. fourth question and sorry I can't answer the last :(
Explanation:
Please help: Which is an example of an internal stimulus
A.a sudden change of air temperature
B. An artificial light that attracts insects
C. Less water or sugar in the body
Answer: it is C because it is part of a “animals” body as I would explain it.
Given the name of an element and the number of neutrons, find the mass of an Isotope
The given element nitrogen have 7 electrons and 7 protons. Mass number is the sum of number of protons and neutron. The number of neutrons is 7. Thus mass number of the isotope is 14.
What is nitrogen?Nitrogen is 7th element in periodic table. It is an electronegative element and is included in p block. Nitrogen exists as gas but sometime it can be liquified under high pressure.
Isotopes are atoms with same atomic number and different mass number. Nitrogen have two isotopes. N-14 and N-15. Mass number is the sum of number of protons and neutrons.
Even though isotopes are different in mass number their chemical properties will be similar but there exists slight changes in their physical properties.
Here, we have 7 protons and 7 electrons therefore, the mass number 14.Thus the isotope given in the diagram is N-14.
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The question asks me to classify the reaction
CO2 (g)+H20(1) H2CO3 (aq)
PLEASE HELP ME ANSWER THE TWO MULTIPLE CHOICE QUESTIONS!!!
ITS FOR CHEM:(
I’LL GIVE BRAINIEST:)
Answer:
4.D. 2KJ
5.B. close to 0 degree celsius
Explanation:
heat absorbed= heat given out
100g * 4.2 * (x-0)= 400g * 4.2* ( 20-x) where x is the new temp reached
then x= 20
i.e. the temperature of ice increases to 5 degree celsius and the temperature of water decreases to 5 degree celsius .
hope it helps
Alguien me puede hacer el favor de ayudarme con estos 3 ejercicios de balanceo de ecuaciones por oxido reducción por favor 1. Fe2O3 + CO → Fe + CO2 2. Al2O3 + C + Cl2 → CO + AlCl3 3. H2S + O2 → SO2 + H2O
Answer:
1. Fe₂O₃ + 3CO → 2Fe + 3CO₂
2. Al₂O₃ + 3C + Cl₂ → 3CO + 2AlCl₃
3. 2H₂S + 3O₂ → 2SO₂ + 2H₂O
Explanation:
Para balancear ecuaciones redox se acostumbra a usar el método ion-electrón, hay que determinar qué elemento se oxida y cual se reduce lo que a la vez significa, aumento del número de oxidación o descenso del mismo.
1. Fe₂O₃ + CO → Fe + CO₂
Para este caso, el hierro se reduce, pasando de Fe³⁺ a Fe⁰ o lo que se dice estado fundamental.
Fe³⁺ + 3e⁻ → Fe
El carbono del CO se oxida a CO₂ donde el carbono pasa de C²⁺ a C⁴⁺
C²⁺ → C⁴⁺ + 2e⁻
Como los electrones quedaron desbalanceados multiplicamos por 2 y 3 las semi reacciones
(Fe³⁺ + 3e⁻ → Fe ) . 2
2Fe³⁺ + 6e⁻ → 2Fe
(C²⁺ → C⁴⁺ + 2e⁻) . 3
3C²⁺ → 3C⁴⁺ + 6e⁻
Ya podemos balancear la ecuacion final:
Fe₂O₃ + 3CO → 2Fe + 3CO₂
(como ya tenemos 2 atomos de hierro en el oxido, no haría falta agregar el 2 en la estoquiometría)
2. Al₂O₃ + C + Cl₂ → CO + AlCl₃
En este caso el carbono se oxida, y el cloro se reduce
C → C²⁺ + 2e⁻
Cl₂ + 2e⁻ → 2Cl⁻
Como el cloro es una molécula diatómica por cada cloro que se reduce, tendremos dos cloruros, tomando los 2 electrones que libera el C.
En este caso los electrones están balanceados
Al₂O₃ + C + Cl₂ → CO + 2AlCl₃
Han quedado desbalanceados el C y el O, asi que no queda otra que completar con la estequiometría
Al₂O₃ + 3C + Cl₂ → 3CO + 2AlCl₃
3. H₂S + O₂ → SO₂ + H₂O
El O₂ se está reduciendo, pasando de 0 a -2
El S del ácido se oxida de +2 a +4
O₂ + 4e⁻ → 2O⁻²
Son dos atomos de O, que cada átomo puede atrapar dos electrones, por ende, consigue enlazar 4 electrones en total
S⁺² → S⁴⁺ + 2e⁻
Como los electrones quedaron desbalanceados, completamos multiplicando la segunda semi reaccion x2
2S⁺² → 2S⁴⁺ + 4e⁻
O₂ + 4e⁻ → 2O⁻²
2H₂S + O₂ → 2SO₂ + 2H₂O
Ya que el oxigeno quedó desbalanceado en el lado producto, completamos con la estoquimetría
2H₂S + 3O₂ → 2SO₂ + 2H₂O
What is one danger associated with the use of hydrogen gas
Answer:
Topping the list of concerns is hydrogen burns. In the presence of an oxidizer -- oxygen is a good one -- hydrogen can catch fire, sometimes explosively, and it burns more easily than gasoline does.
Answer:
hydrogen burns
hope it helps
Match each form of energy with its correct description.
mechanical
involving the motion of atoms
chemical
involving electrical charges
thermal
involving the position and motion of
an object
electrical
involving energy stored in chemical
bonds
Answer
involving electrical charges: electrical
involving energy stored in chemical
bonds: thermal
involving the position and motion of
an object: mechanical
involving the motion of atoms: chemical
Explanation:
almost 100 this is right, sorry if this is wrong :)
How many Joules of heat are needed to melt 3.0 g of ice?
Answer:A substance must absorb heat energy so that it can melt or boil. The temperature of the substance does not change during melting, boiling or freezing - even though energy is still being transferred
Explanation:imm not sure
Which of the following is true about a hypothesis that is proven to be inaccurate? WILL GIVE BRAINLIEST FOR CORRECT ANSWER!!
A. An inaccurate hypothesis is not valuable.
B. It allows the scientist to eliminate any possibility of a relationship between two variables.
C. It will provide information to help formulate a new hypothesis in the future.
D. It proves that the exact opposite of the hypothesis is true.
Answer:
C. It Will Provide information to help formulate a new hypothesis in the future.
Explanation:
I had AP Chemistry.
The following statement that it will provide information to help formulate a new hypothesis in the future is true about a hypothesis that is proven to be inaccurate.
What is hypothesis?Hypothesis can be defined as an assumption which is made for the sake of argument . It is an interpretation of a practical condition for which action needs to be taken.It is defined as a tentative assumption which is made to test logical consequences.It is an antecedent clause of a statement which is conditional.
It is constructed before research. There are six types of hypothesis 1)simple hypothesis 2) complex hypothesis 3) directional hypothesis 4)non-directional hypothesis 5) null hypothesis 6)casual hypothesis
The hypothesis should be clear and precise, it must be specific and way of explanation of hypothesis should be simple.
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Which of the following best explains why the
Gastropod is not a good example of an index
fossil?
Answer:
Since the gastropod is not unique, it cannot be an index fossil. An index fossil must be found over a wide area of the Earth. Since the gastropod is widely spread, it cannot be an index fossil.
Explanation:
Gas laws mad question under it
Answer:
what are you asking tho?
Explanation:
Thx for the Free points tho.
Which of an atom's electrons are inrolved in chemical reactions?
Answer:
Electrons at the outermost energy level of an atom are called valence electrons. They determine many of the properties of an element. That's because these electrons are involved in chemical reactions with other atoms. Shared electrons bind atoms together to form chemical compounds.
Explanation:
Answer:
electrons farthest from the nucleus of the atom. they are called valence electrons
A_________is the distance from one compression to the next compression in a longitudinal wave. (Page 2 Vocabulary)
A.frequency
B.rarefaction
C.amplification
D.wavelength
Answer:
wavelength
Explanation: