Which of the following shows the valency of 1?

a) nitrogen
b) carbon
c) oxygen
d) sodium​

Answers

Answer 1

[tex]\huge \bf༆ Answer ༄[/tex]

The element having valency of 1 is ~

Sodium (Na)
Answer 2

Answer: Pretty sure this is d.) sodium

Explanation:


Related Questions

A substance has a molar heat of combustion of -810.4 kj/mol. when 0.285 mol of the substance is burned in a calorimeter containing 8.60 kg of water, the increase in water temperature is:

Answers

Answer:

6.42 °C

Explanation:

Q = mcΔT

Q = energy gain/release (J)

m = mass (kg)

c = specific heat capacity (J/°C/kg)

ΔT = change in temperature (°C)

Qs = n(ΔH°c)

Qs = energy gained/released from substance (kJ)

n = moles (mol)

ΔH°c = molar heat of combustion (kJ/mol)

m = 8.60

n = 0.285

ΔH°c = -810.4

c (of water) = 4184

Qs = 0.285(-810.4)

Qs = -230.964 (or -230964 J)

Q = 230964

230964 = (8.60)(4184)ΔT

230964 = 35982.4(ΔT)

ΔT = 6.4188... °C → 6.42 °C

Chose any ONE state of matter and explain the space of the particles.
Use a drawing to help explain.

Answers

Answer:

solid

intermolecular space is very closed to each other and tightly packed

What is the wavelength, in nanometers, of light with a frequency of 1.97x10^15 Hz?
a) 1.52 nm
b) 1.52x10^-7 nm
c) 152 nm
d) 15.2 nm

Answers

*v=c/λ
λ = 3*10^8 m/s /1.97 *10^15
λ = 1.5 *10^-7
The calculated wavelength is in unit of meter. use the relationship between meter and nanometer to convert to the correct units.

Which of the following ideas did Greek philosopher Democritus contribute to the atomic theory?
A. Matter is composed of only one kind of particle, which can be easily destroyed.
B. Every element has a specific type of atom, which remains the same size in all forms of matter.
C. All matter is composed of small particles, which combine to make larger objects.
D. Each object is made up of one atom, which varies in size from very small to very large.
I will mark the correct answer the brainliest

Answers

Answer:

c. all matter is composed of small particles,which combine to make larger objects

Which statement is false?
a. The density of a gas is constant as long as its temperature remains
constant.
b. Gases can be expanded without limit.
c. Gases diffuse into each other and mix almost immediately when put into the
same container.
d. The molecular weight of a gaseous compound is a non-variable quantity.

Answers

The answer is A- false

increasing temperature increases:
1:Enthalpy
2:Free Energy
3:Entropy
4:Specific heat​

Answers

Answer:

2 :free energy

Explanation:

I hope it is fine answer for you ☺️☺️☺️

What can a scientist use to observe very small things?
1. A good pair of glasses
2. Tools and technology
3. The five senses
4. Sense of touch

Answers

Answer:

2

Explanation:

depends on how small but you wouldn't be able to see with good glasses your senses or your touch

Answer:

Tools and Technology ( Microscopes etc)

Explanation:

Glasses are not good enough to see on the molecular and cellular level.

The five senses aren't reliable and can vary between people.

Touch is one of the 5 senses, and touching chemicals isn't good.

Can someone please help. I have no idea how to do this

Answers

Explanation:

c-o number if electrons shared: 4. doubke bond. non polar

c-cl 2 electrons sharde single bond non polar

I know this cause one dash equals 2 electrons chemistry teachers use them when two compounds are sharing electrons rather then using two dots so people know the difference

1. List the ketose carbon(s) that is(are) reduced with NaBH4.

Answers

Answer:

ehh im nit sure but here!

Explanation:

Polyvalent ions are

1) Anions with variable charges
2) Cations from columns 3 to 12
3) Ions that can be positive or negative

Answers

Answer:
3) Ions that can be positive or negative

Hope this helps!

please help me!! DUE TOMORROW :(

Answers

Answer:

It’s in the photo, sorry if it’s really messy!

Explanation:

Please ask if you have any questions!

List the four quantum numbers

Answers

Answer: In atoms, there are a total of four quantum numbers: the principal quantum number (n), the orbital angular momentum quantum number (l), the magnetic quantum number (ml), and the electron spin quantum number (ms).

Answer:

(n)

(i)

(mı)

(ms) s is suppose to be smaller than the m

Explanation:

the principal quantum number (n)

the orbital angular momentum quantum number (I)

the magnetic quantum number (ml)

the electronic spin quantum number (ms)

Which of the following is a challenge of prosthetic engineering that has been met through tissue engineering?

- Predicting failure
- Biocompatibility
- Strength
- Power

Answers

Answer:

Biocompatibility

Explanation:

I’m a genius and it’s the answer :D

Biocompatibility is a challenge of prosthetic engineering that has been met through tissue engineering. Hence, option B is correct.

What is Biocompatibility?

Biocompatible materials are used in medical devices, such as menstrual cups, stents, or ventilators.

A biocompatibility problem might happen when some of the materials are trapped in the patient's gingival sulcus.

Tissue engineering is an important field of regenerative medicine for tissue repair (after damaged caused by a disease or an accident, for example).

To offer this possibility, stem cells are important tools owing to their capacity to differentiate into a large number of cells according to the stimuli provided.

Hence, option B is correct.

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50 PTS!!!! No links pls!
What is a title name for Aerobic cellular respiration?

Answers

Answer:

Like another name?

Aerobic cellular respiration is also called aerobic metabolism, cell respiration, and oxidative metabolism.

Explanation:

Define Endothermic reaction in terms of Deta H

Answers

I didn't learn about that topic in school,but I found this :

I hope it helps<3

Diazene, N2H2 (also known as diimine), is commonly used as a reagent for organic syntheses. Label each image with the type of
bond in diazene that it shows.

Answers

The first image shown at the left hand side is a pi bond. The other two images show sigma bonds.

In chemistry, a bond results from the overlap of atomic orbitals. This overlap may be end to end (sigma bond) or side by side (pi bond). Having said this, it is easier to decide whether the bonds in the image shown are sigma or bi bonds.

If we label the images; 1,2,3 from left to right, we can see that the overlap in image 1 is side by side. The electron density lies above and below the plane of the bond. This is a pi bond. In images 2 and 3, the overlap occurs in an end to end manner. This is a sigma bond.

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Why does the Hubble Space Telescope take clearer pictures than other telescopes?

Answers

Answer:

Space-based telescopes like Hubble get a much clearer view of the universe than most of their ground-based counterparts. ... Ground-based telescopes can't do the same, because the Earth's atmosphere absorbs a lot of the infrared and ultraviolet light that passes through it.

convert 8.4 • 10^16 molecules of CO2 to moles

Answers

Answer:

0.00000000000000084

Explanation:

is the effect of hot and cold water on acid different?​

Answers

Answer:

When the acid is mixed with the water, an immediate chemical reaction takes place. The formation of carbon dioxide causes breakdown of the sample into finer particles.  

The heat in the Stomach rises up, causing esophageal reflux, chronic sinusitis, headaches, eye disorders and problems with the teeth. Furthermore, ingesting cold water creates moisture or “dampness.” Bacteria, candida, and parasites thrive in damp areas, especially in your stomach and uterus.

Which statement best explains the purpose of using a mole in the measurement of matter? It is commonly used as another unit of mass. It allows chemists to deal with a large number of atoms. It is used only for studying the properties of gases. It explains that substances with the same moles have the same mass.

Answers

Answer:

B) It allows chemists to deal with a large number of atoms.

Explanation:

On Edge 2022

The  statement  which best explains the purpose of using a mole in the measurement of matter is that it allows chemists to deal with a large number of atoms.

What is a mole?

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons .Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

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How many decigrams of chromium are in 3.19 x 10^23 atoms of chromium? show work

Answers

mol = 3.19 × 10^23/6.02^23

= 0.529 mol

mass = 0.529 × 52

= 27.508 g

g to decigram

= 27.508 × 10

= 275.08 decigram

I have a problem with solving this type of chemistry problem. Please Help!

Answers

Umm what chemistry problem ? Umm you could send it so that l can help you better .

Name three sources of atmospheric carbon dioxide.

Answers

Answer:

Natural sources include decomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.

Which pair of elements form an ionic bond with
each other?
A. KCL
B. ICL
C. PCL
D. HCL

I think it’s A and D but if it’s not both can you please explain why it’s one and not the other?

Answers

Answer:

Yes Both A) KCL and D) HCL are correct...

Answer:

It's only A

Explanation:

Potassium (K) is a metal and Chlorine (Cl) is a nonmetal, and ionic compounds are formed between metals and nonmetals. So KCl forms ionic bonds.

Hydrogen (H) and Chlorine (Cl) are both nonmetals, and only covalent bonds form between nonmetals. (Only exception is when its an acid, then it's ionic)

Also, the question indicated which "pair" and not "pairs" meaning that there is only one answer, and I'm more likely to go with A rather than D.

how many compounds can I make with sodium, hydrogen, oxygen?

will give brainliest and 100 points to the correct answer

Answers

Answer:

маны

Explanation:

Answer:

2H2 + O2 → 2H2O

Explanation:

C= ( F - 32) / 1.8
86 F = ?

Answers

Answer:

C = 30

Explanation:

C = (86 - 32)/1.8

C = (54)/1.8

C = 30

what is wrong with the statement? "because there are no common factors in the molecular formula, k2co3 is also the empirical formula of potassium carbonate"

Answers

The empirical formula is the same as the molecular formula because the ratio of atoms in the compound correspond to the number of atoms of each element in the compound.

The empirical formula of a compound shows the ratio of atoms of each element in the compound while the molecular formula shows the number of atoms of each element in the compound.

For the compound, K2CO3, the empirical formula is the same as the molecular formula because the ratio of atoms in the compound correspond to the number of atoms of each element in the compound. It has nothing to do with common factors.

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what are the solar home lighting​

Answers

Answer:

Sunlight

Explanation:

Home lighting System is powered by solar energy using solar cells that convert solar energy (sunlight) directly to electricity. The electricity is stored in batteries and used for the purpose of lighting whenever required

Explain in your own words:

i. Sublimation

ii. Condensation

iii. Melting

Answers

sublimation- a change of state from a solid to a gas without going through the liquid state.

condensation- change of state from a gas to a liquid

melting- when a solid turns into a liquid

An ammonia solution has a pH of 8.25. What is its [OH-]?

Answers

pH + pOH = 14

If pH=8.25, then:

pOH = 14 - 8.25 = 5.75

pOH = -log[OH-]

5.75 = -log[OH-]

-5.75 = log[OH-]

10^(-5.75) = [OH-]

[OH-] = 0,0000017783

[OH-] = 1,78×10^(-6) mol/dm³

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