14. Aluminum reacts with a certain unknown element (element X) to form the following formula. Which group must element X belong to? *

Answer:

B

Explanation: Density by definition is the amount of matter per given volume.

Answer:

eye wash station

Explanation:

Answer:

Optical Atomic Spectroscopy

Explanation:

...

The kind of spectra used to measure the atomic number of elements is X-ray spectra.

The atomic number of elements is the number of protons in the nucleus of the element. According to the modern periodic law, the properties of elements is a periodic function of their atomic numbers.

In 1913, Mosely demonstrated that the atomic number of elements can be obtained from the X-ray spectra of elements. Using this method, he arranged the elements in order of increasing atomic number.

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Answer:

Distance cover = 8 km

Explanation:

Given:

Speed of runner = 4 km/h

Time taken = 2 hour

Find:

Distance cover

Computation:

Distance = Speed x Time

Distance cover = Speed of runner x Time taken

Distance cover = 4 x 2

Distance cover = 8 km

Answer: the sugar ge hotter??

Explanation:

Answer:

B

Explanation:

Answer: hey im here, whats up?

Explanation:

Answer:

874.59

Explanation:

The number after 9 is 1

1 is lower than 5 so we leave the previous number the same

The number 874.591 correct to 2 decimal places is 874.59.

A decimal is a fraction written in a special shape. as opposed to writing 1/2, for example, you could express the fraction because the decimal 0.5, where the 0 is inside the one vicinity and the 5 is within the tenths vicinity. Decimal comes from the Latin phrase decimus, meaning tenth, from the root phrase decem, or 10.

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The mass after 16.042 days : 1.4 g

Given

mass of 5.6 gram sample of I-131

time=16.042 days

Required

The mass of a sample

Solution

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

Half-life of I-131 = 8 days

Input the value :

[tex]\tt Nt=5.6.\dfrac{1}{2}^{16.042/8}\\\\Nt=\boxed{\bold{1.4~g}}}[/tex]

Answer:

Single celled organism

Explanation:

They fall under two categories:

Eukaryotes and prokaryotes.

Eukaryotes: Evolved from prokaryotes, they are larger and more complex. Unlike prokaryotes, they have a nucleus. Can be single celled or multicellular.

Prokaryotes: Oldest cell type, small and simple. They do not have a nucleus. Open unit with no compartments.

Answer:

It combusts

Explanation:

Answer:

Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed. Enzymes are naturally occurring catalysts responsible for many essential biochemical reactions.

Explanation:

Answer:

True

Explanation:

Answer:

True

Explanation:

Answer:

By precipitation (rain)

Explanation:

Water at the surface of the ocean, rivers, and lakes can become water vapor and move into the atmosphere with a little added energy from the Sun through a process called evaporation. Snow and ice can also become water vapor through a process called sublimation..

Answer: an electric generator

Explanation:

The answer is A) An electric generator.

Kinetic power is the strength of the movement, observable as the motion of an item, particle, or set of debris. Any item in motion is using kinetic electricity: someone on foot, a thrown baseball, a crumb falling from a desk, and a charged particle in an electric field are all examples of kinetic power in paintings.

There are 3 subcategories of kinetic energy: vibrational, rotational, and translational. Vibrational kinetic strength is, unsurprisingly, a result of items vibrating. Rotational kinetic power is created with the aid of shifting items, while translational kinetic power is due to gadgets colliding with one another.

Something at domestic that moves are an instance of kinetic energy. this can be a cue ball rolling on a billiards table, a fan circulating air on a warm day, or glass shattering on the floor after it falls from the counter. electrical gadgets that are becoming on use kinetic energy as do humans transferring about the residence.

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Explanation:

it will have 9 electrons because atomic number is equals to number of protons and number of protons is equal to number of electrons in an atom

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Answer:

The answer is 10.8 g of lH2.

Explanation:

As per the equation, let us calculate the mole ratio.

N2+3H2→2NH3

As per the equation one mole of nitrogen reacts with 1 mol of hydrogen.

In terms of mass. 28.01 g of nitrogen needs 3 mol of hydrogen or 6.048 g of hydrogen.

We can set up the ratio:

28.01 g of lN2 needs 6.048 g of lH2

1 g of lN2 needs 6.048 / 28.01 g of lH2

50.0 g of lN2 needs 6.048×50.0 28.01 lg of lH2

=

10.8 g of lH2

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Answer:

the unknown force is 35kg/m/s²

Answer:

Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.

Answer:

The answer is C. Plasma

Answer:

: cathode rays

a beam of electrons emitted from the cathode of a high-vacuum tube.

During the 1880s and '90s scientists searched cathode rays for the carrier of the electrical properties in matter. Their work culminated in the discovery by English physicist J.J. Thomson of the electron in 1897.

Answer:

E = 15×10⁻²⁹ J

Explanation:

Given data:

Frequency of photon = 2.2× 10⁷ Hz

Energy of photon = ?

Solution:

Formula:

E = h.f

h = 6.63×10⁻³⁴ Js

by putting values,

E = 6.63×10⁻³⁴ Js × 2.2× 10⁷ s⁻¹

E = 14.586 ×10⁻²⁹ J

E = 15×10⁻²⁹ J

The energy of photon is 15×10⁻²⁹ J.

Answer:

what are the orbitals present in the fifth principal energy level​

Explanation:

Answer: the fifth principal energy level has the s, p, d, and f orbitals so the answer is letter d

Explanation:

Answer: Physical change : tearing of paper, fixing of wtaer

Chemical change:  rusting of iron ,  electrolysis of water​, Rancidification

Explanation:

Physical change is a change in which there is no rearrangement of atoms and thus no new substance is formed. There is only change in physical state of the substance.

Example:  tearing of paper, fixing of wtaer

Chemical change is a change in which there is rearrangement of atoms and thus new substance is formed. There may or may not be a change in physical state.

Example: rusting of iron ,  electrolysis of water​, Rancidification

Answer:

it's-B.....................

Answer:

True

Explanation:

Finding tropical fossils in now-cold places is evidence for climate change. This indicates that the site at which the fossils were found once had a tropical climate.