Identify the type of the following chemical reaction.

Answer:

10.71 g/mL

Explanation:

Initial Volume = 17.5 mL

Final Volume = 20.3 mL

Volume of cube = Final Volume - Initial Volume = 20.3 mL - 17.5 mL = 2.8mL

Mass of cube = 30g

Density = Mass / Volume

Density = 30 / 2.8 = 10.71 g/mL

Answer:

12 cuz the atomic number is 12

Explanation:

Answer:

B The United States

Explanation:

most other countries use the C to measure their temperature

Answer:

Explanation:

Now, you know that this solution has a molarity of 6.00 M, which basically means that every liter, which is the equivalent of 1000 mL, will contain 6.00 moles of ammonia. Since we've picked a sample of 1000 mL, you can say that it will contain 6.00 moles of ammonia. To convert this to grams, use the compound's molar mass

Answer:

D  1.0 g of powdered Zn(s) in 50. mL of 1.0 M HCl(aq) at 30.°C

Explanation:

There are several factors affecting and controlling the rate of chemical reactions.

Some of which are applicable in resolving this problem is the nature of the reactants and their concentration. Also, the temperature of the reaction is also very important.

Answer:

it is good for thermoelectric power plant cooling

it means that there is a lot of salt in the water

Someone would remove salt from water to be able to drink it

lastly, salt can be removed from water with reverse osmosis systems

Answer:

D) cooling of the reaction mixture

Explanation:

Increase in temperature speedens the rate of a chemical reaction

Answer:

22m/s

Explanation:

Given parameters:

Time  = 5s

Acceleration  = 4m/s²

Initial velocity  = 2m/s

Unknown

Final speed  = ?

Solution:

To solve this problem, we use the expression below;

         v = u + at

v is the final speed

u is the initial speed

a is the acceleration

t is the time taken

 So, insert the parameters and solve;

         v  = 2 + 4 x 5  = 22m/s

Answer & Explanation:  The Ames test examines the mutagenic effects of chemicals ; as such, it detects whether a given chemical can cause a reversion mutation in his- bacteria. While this is the purpose of the test, some of the reversion mutations are not caused by the mutagen being tested  for. The appearance of his revertants in the presence of a non-mutagenic control compound therefore indicates that His+ revertants on the control plate are the result of spontaneous mutation.

Answer:

[2] Na + [2] H2O ➖ [2] NaOH + [ ] H2

Hope it will help :)

Answer:

2, 2, 2, and 1

Explanation:

I put that in and it was correct.

Answer:

The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength. ... The more rigid (or less compressible) the medium, the faster the speed of sound

Explanation:

Answer:

The speed of sound can change when sound travels from one medium to another. However, the frequency usually remains the same because it is like a driven oscillation and has the frequency of the original source. If vw changes and f remains the same, then the wavelength λ must change.

Answer:

14.05moles

Explanation:

Given parameters:

Number of atoms of NaF  = 8.46 x 10²⁴atoms

Unknown:

Number of moles  = ?

Solution:

To solve this problem, we must understand that a mole of any substance contains the Avogadro's number of particles.

             6.02 x 10²³ atoms makes up 1 mole of an atom

             8.46 x 10²⁴ atoms will contain = [tex]\frac{8.46 x 10^{24} }{6.02 x 10^{23} }[/tex]  = 14.05moles

Answer:

14.05 moles

Explanation:

Answer: The answer is D :)

Explanation:

Answer:

D

Explanation:

Answer:

C

Explanation:

The molecules are farther apart in steam than in water.

Answer:

what about carbon paired electrons? what do you need to know about them?

Explanation:

Answer:

c

Explanation:

Answer:

240

Explanation:

15 POUNTS 240

i think its the answer D

Answer:

8.9L is the volume of the gas that must be dissolved.

Explanation:

For a weak base, we can find [(CH₃)₃N] using the equation:

Kb = [OH⁻] [[(CH₃)₃NH⁺] / [(CH₃)₃N]

As [OH⁻] = [[(CH₃)₃NH⁺] and [OH⁻] = 10^-pOH = 3.16x10⁻³M:

6.3x10⁻⁵ = [3.16x10⁻³M][3.16x10⁻³M] / [(CH₃)₃N]

[(CH₃)₃N] = 0.1587M

As the volume is 2.5L, moles are:

2.5L * (0.1587mol / L) = 0.3968moles

Using:

PV = nRT

We can solve for volume of the gas as follows:

P = 1atm at STP; n = 0.3968moles; R = 0.082atmL/molK; T = 273.15K at STP

V = 0.3968mol*0.082atmL/molK*273.15K/1atm

V = 8.9L is the volume of the gas that must be dissolved.

The two activities that happen as the embryo grows are: D. The cells divide and B. The cells form new organisms. The correct answer is option B and D, respectively.

Cell division is the process by which a single cell divides into two or more daughter cells. It is a fundamental process in all living organisms and is essential for growth, development, and repair of tissues. There are two main types of cell division: mitosis and meiosis.

As the embryo grows, its cells divide and multiply, which leads to an increase in the number of cells. This process is called cell division and is necessary for the growth and development of the embryo.

In addition to cell division, the cells in the embryo also differentiate and specialize to form the various tissues and organs of the body. This process is called morphogenesis and is essential for the formation of a functional organism.

Therefore, the correct options are B. The cells form new organisms and D. The cells divide, respectively.

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Answer:

1. False

2. True

3. False

4. True

5. True

Explanation:

Answer:

Radioisotopes are radioactive isotopes of an element. They can also be defined as atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.

Explanation:

Answer:

I know Z

Explanation:

because here is mixing two substance so there is mixture

The isotope notation : ⁷³₅₃X

Given

53 protons and 20 neutron

Required

The isotope notation

Solution

Isotopes are elements that have the same atomic number with a different mass number

The following element notation,

[tex]\large {{{A} \atop {Z}} \right X}[/tex]

X = symbol of element

A = mass number

   = number of protons + number of neutrons

Z = atomic number

   = number of protons = number of electrons, on neutral elements

So the mass number of element = 53 + 20 = 73

Atomic number = 53

The symbol :

[tex]\large {{{73} \atop {53}} \right X}[/tex]

Answer:

a lewis acid accepts electron pairs

Explanation:

a p e x

The fact that is true about Lewis acid is that A Lewis acid donates electron pairs. Hence option D is correct.

In chemistry, a Lewis acid is a chemical species that can accept a pair of electrons from another species, known as a Lewis base. Lewis acids are electron pair acceptors.

They can be identified by their tendency to form a covalent bond with a Lewis base by accepting a pair of electrons. This definition of Lewis acids and bases, provided by Gilbert N. Lewis, helped to provide a more comprehensive understanding of chemical reactions beyond the traditional acid-base theory.

Common examples of Lewis acids include metal cations, such as aluminum and boron, and compounds such as carbonyl compounds and acids with a positive charge. Lewis acids play an important role in many chemical reactions, including organic synthesis, coordination chemistry, and acid-catalyzed reactions.

Therefore, option D, A Lewis acid donates electron pairs is correct.

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Answer:

Excellent Electrical Conductors.

Explanation:

(Though I believe some of these answers could be worded better), Most non-metals are terrible conductors of electricity and heat. Nonmetals in solid forms lack luster and can be brittle, and there are semiconductors compared to Metals.

Answer:

Excellent Electrical Conductor, I believe.

Explanation:

Most metals are good electric conductors...

Id wait until somebody else answers to verify my answer.

Answer:

ummm according 2 me babies are consumers and rocks are also consumers

Answer:

4

Explanation:

its a non-metal, dont get confused and pick number 1- it may seem like that’s the answer but remember here we are talking abut the solid phase!

Periodic table is divided into three metals, non metals and metalloids. The non metals are kept on the right side of the periodic table. Th correct option is option D.

Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion. The examples of non metals are Oxygen, nitrogen, carbon, Fluorine etc.

The properties of non metals are

Non metals are soft.

Non metals are not malleable that is they can be broken into thin sheets.

Non metals are not ductile they can not be broken into thin wires.

Non metals are brittle in nature that is they can be broken down easily.

Non metals are not lustrous.

Therefore the correct option is option D.

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[tex]\huge\boxed{4\ \text{kg/m$^3$}}[/tex]

We know that [tex]\rho=m\div V[/tex], where [tex]\rho[/tex] is density, [tex]m[/tex] is mass, and [tex]V[/tex] is volume.

Substitute in the values we know and solve:

[tex]\begin{aligned}\rho&=8\div2\\&=\boxed{4}\end{aligned}[/tex]