please help from the first to last question?​

Answer:

1.98 ×10^2 g

Explanation:

follow the method in the above image

Answer:

Dalton's atomic theory has been modified as

Explanation:

Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes

Answer:

On the basis of new experimental facts, Dalton's atomic theory has been modified as: ... Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes.

Explanation:

Plz mark brainliest thanks

Answer:

the answer is 4

Explanation:

i took the test and got it right and i would recommend using quizlet it has these flash cards and the answers are there you just click on the one that says your question and it will say your answer on the back. It helps with most of my test! Hope this helps (:

Answer:

10.60 grams of silane gas are formed.

Explanation:

From the reaction:

Mg₂Si(s) + 4H₂O(l) → 2Mg(OH)₂(aq) + SiH₄(g)          

We know that the limiting reactant is Mg₂Si, so to find the mass of SiH₄ formed we need to calculate the number of moles of Mg₂Si:

[tex]\eta_{Mg_{2}Si} = \frac{m_{Mg_{2}Si}}{M_{Mg_{2}Si}}[/tex]

Where:

m: is the mass of Mg₂Si = 25.0 g

M: is the molar mass of Mg₂Si = 76.69 g/mol

[tex]\eta_{Mg_{2}Si} = \frac{m_{Mg_{2}Si}}{M_{Mg_{2}Si}} = \frac{25.0 g}{76.69 g/mol} = 0.33 moles[/tex]

Now, the stoichiometric relation between Mg₂Si and SiH₄ is 1:1 so:

[tex] \eta_{Mg_{2}Si} = \eta_{SiH_{4}} = 0.33 moles [/tex]

Finally, the mass of SiH₄ is:

[tex] m_{SiH_{4}} = \eta_{SiH_{4}}*M_{SiH_{4}} = 0.33 moles*32.12 g/mol = 10.60 g [/tex]

Therefore, 10.60 grams of silane gas are formed.

I hope it helps you!    

Answer:

Thus there was no accumulation of ions on the nails, as the dissolved gases were already removed, hence no rust formation. In test tube C, a chemical was added to absorb the water vapour. We know that rust formation takes place when a metal is exposed to water vapour.

Explanation:i hope u have a wonderful night and stays safe

Answer:

40.38 grams

Explanation:

Answer: C) a proton is in the nucleus, has a positive charge, and an atomic mass of 1 amu.

Explanation:

Protons are positive so they give a positive charge, they are also never outside of the nucleus.  Only electrons are outside the nucleus.

Answer:Tungsten is made of tungsten while Nichrome is made of nickel chromium. ... Tungsten is used to make filament of bulbs. Nichrome have high resistivity than tungsten.

Explanation:i hope u have a wonderful night and stay safe

Answer: a

Explanation:

im big brain

The diagram that shows two (2) waveforms with different amplitudes but the same wavelengths is: Diagram A.

A wave can be defined as a disturbance that is created in a medium, which progressively transports energy from a source to another location without the transportation of matter. Some of the parameters that are associated with a waveform include the following:

Amplitude refers to the maximum displacement of a wave when measured from its equilibrium position.

Wavelength refers to the distance between two (2) successive crests (troughs) of a wave.

Note: Amplitude is measured vertically from an equilibrium position while wavelength is measured horizontally.

In conclusion, Diagram A shows two (2) waveforms with different amplitudes but the same wavelengths.

Find more information on wave here: https://brainly.com/question/23460034

Answer:

the metal loses electrons to become a positively charged cation

Explanation:

Answer:

a mixture

Explanation:

Two or more substances combined chemically, are called a compound

Answer:

B. Unbalanced force

Explanation:

Answer:

I think its unbalanced force

Explanation:

crazy what a quick go.ogle search can do! :)

Answer:

Ur missing info

Explanation:

Answer:

The kinetic-molecular theory explains why gases are more compressible than either liquids or solids. Gases are compressible because most of the volume of a gas is composed of the large amounts of empty space between the gas particles. Compressed gases are used in many situations.

Explanation:

Ca is -2

Be is stabilized

Ba is -4

Sr is -3

so it would be =>  Ba, Sr, Ca, Be

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The arrangement of the alkaline earth metals from the lowest to highest electronegativity is; Ba< Sr< Ca<Be

Electronegativity refers to the ability of the atoms of an element in a compound to attract the shared electrons of that bond towards itself. It is a property that decreases down the group but increases across the period.

Electronegativity increases across the period as atoms of elements become smaller in size and decreases down the group because of increase in distance between the valence electrons and nucleus.

Since electronegativity decreases down the group, the order of electronegativity from lowest to highest is; Ba< Sr< Ca<Be

Learn more: https://brainly.com/question/2060520

Answer:

Fe 2 O3 .

Explanation:

Answer:

Synthesis reaction~~~~~~~

Explanation:

Answer:It has 8grams of hydrgen

Explanation:

Answer:

Nucleus

Explanation:

The nucleus serves as the cells command center, sending direction to the cell to grow, mature, divide, or die

Answer:

Well its actually the movement of tectonic plates under the earths surface that when the slide along each other, pull away from each other, or push up against each other they create earth quakes.

Explanation: yes.

Answer:

............................................

Answer:

is a way of presenting information about the chemical proportions of atoms

Explanation:

Answer:

Force

Explanation:

The force is applied to either pushing or pulling forwarding momentum and movement.

Answer:

A: Force

It is a push/pull that changes the motion of an object