what is combined to get calcium chloride​

Answer: There are 20 protons neutrons in the atom

Answer:

The first ionization energies (I1) of the alkaline earth metals are not as low as the alkali metals. The alkaline earth metals are therefore less reactive than the alkali metals (Be and Mg are the least reactive of the alkaline earth metals). Several physical properties of these elements are compared in Table 7.7.

Answer:

13.13g

Explanation:

65.8÷80.06 =0.821 mol the same

the same amount of moles of Oxygen reacts with

because the ratio is 1 :1-1

let's calculate how much grams for 0.821 of oxygen

oxygen 1 mole is =16 g

well for 0.821=16* 0.821 which is 13.136grams

Answer:

A dam like structure used to capture energy from masses of water moving in or out of a bay of rivers due to tidal force is called tidal barrage.

Explanation:

It may help you to solve question.

Answer:

I think it's A but I might be wrong

Explanation:

The number of atoms of Hg in 4.5 mole sample has been given as [tex]\rm 2.7099\;\times\;10^2^4[/tex]. Thus, option A is correct.

The number of atoms in a mole of sample has been given by Avogadro number. Avogadro number has been a constant and has been given the value of [tex]\rm 6.023\;\times\;10^2^3[/tex].

The number of atoms in a mole of sample has been given as:

[tex]\rm 1\;mole=\;6.022\;\times\;10^2^3[/tex]

The given sample has been consisted of 4.5 moles of Hg. Thus, the number of atoms in the sample has been given by:

[tex]\rm 1\;mole\;Hg=\;6.022\;\times\;10^2^3\;atoms\\4.5\;mol\;Hg=4.5\;\times\;6.022\;\times\;10^2^3\;atoms\\4.5\;mol\;Hg=27.099\;\times\;10^2^3\;atoms[/tex]

The scientific notation has been the short hand used for writing the numbers. The short hand for atoms in 4.5 moles of Hg has been [tex]\rm 2.7099\;\times\;10^2^4[/tex].

Thus, the number of atoms of Hg in 4.5 mole sample has been given as [tex]\rm 2.7099\;\times\;10^2^4[/tex]. Thus, option A is correct.

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Answer:

due to the formation of an oxide or hydroxide layer

Explanation:

magnesium is a reactive metal...when left in air it reacts with oxygen to form an oxide layer of MgO and it can react with moisture to form Mg(OH)2 LAYER ON THE SURFACE.

On the periodic table, hydrogen and helium are the only two elements in the first row, or period, which reflects that they only have electrons in their first shell. Hydrogen and helium are the only two elements that have electrons exclusively in the 1 s 1s 1s orbital in their neutral, non-charged, state.

Answer:

A

Explanation:

distance over time is speed's equation

Answer:

yes

Explanation:

Answer:

Yes

Explanation:

Albert Einstein is often cited as one of the most influential scientists of the 20th century. His work continues to help astronomers study everything from gravitational waves to Mercury's orbit

The mass of nitric acid required to make the given solution is 0.0627 g.

The given parameters:

The hydrogen ion (H⁺) concentration of the nitric acid is calculated as follows;

[tex]H^+ = 10^{-pH}\\\\H^+ = 10^{-2.4}\\\\H^+ = 0.00398[/tex]

The molarity of the nitric acid is calculated as follows;

[tex]= 0.00398 \ H^+ \times \frac{1 \ M \ HNO_3}{1 \ H^+} \\\\= 0.00398 \ M[/tex]

The number of moles of the nitric acid is calculated as follows;

[tex]moles = M\times L\\\\moles = 0.00398\ M \ \times \ \frac{250 \ mL}{1000} \\\\moles = 9.95 \times 10^{-4} \ mol.[/tex]

The molar mass of nitric acid is calculated as;

[tex]HNO_3 = (1) \ + (14) \ + (16 \times 3) = 63 \ g/mol[/tex]

The mass of the nitric acid contained in the calculated number of moles is calculated as;

[tex]mass = moles\ \times \ molar \ mass\\\\mass = 9.95\times 10^{-4} \ mol. \ \times \ 63 \ g/mol\\\\mass = 0.0627 \ g[/tex]

Thus, the mass of nitric acid required to make the given solution is 0.0627 g.

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Answer:

2.409*10^24

Explanation:

If I am not mistaken you are supposed to do 4*6.022*10^23. This will allow for it to be converted.

I hope this helped

Answer:

4.50000 moles

Explanation:

This is dimensional analysis. If there is 163.59 grams in 1 mole of this compound then the converse is true: in 1 mole of this compound there is 163.59 grams --> 1 mol/163.59 grams.

Now that you have your conversion factor:

736.155 grams * (1 mol/163.59 grams) is your equation.

When you multiply these together, grams cancel and you end up with the desired mole-based answer:

4.50000 moles (The extra zeros are to make up for the 6 significant figures in 736.155, feel free to omit them if necessary.)

(pls give brainliest if this helped)

Answer:

NH4I

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

I hope it helps

Answer:Ammonium Iodide is a chemical compound with a formula Explanation: nh4l

Answer:

A. Motors and generators are opposite processes

Explanation:

B, C, and D are wrong because, the term electrical generator is used to describe a range of devices that convert mechanical energy into electricity. A motor converts electrical energy into mechanical, which is the opposite process to the electrical generator.

balanced equation - 3CaCl2 + 2Na3PO4 → Ca3(PO4)2 + 6NaCl

products - calcium phosphate and sodium chloride

Answer:

Ca3(PO4)2 + NaCl

Explanation:

calcium phosphate and sodium chloride

Answer:

She remembered what she had learned about the cell theory as she observed the protists moving. Which three ideas are included in the cell theory ..

Explanation:

Answer:

Skittles are coated with sugar and food coloring. When you add warm water to the Skittles, the sugar and food coloring start to dissolve. They have similar amounts coated on them so they dissolve at similar speeds and stay in their lanes.

The sugar is moving to areas of water with lower sugar concentration. If the water is poured in the center, this is happening for each Skittle at relatively the same speed.

Explanation:

Answer:

between metal and nonmetal ions

Explanation:

Answer:

Dilute the sample

Explanation:

The statement is not entirely accurate. The Bradford assay is commonly used to determine protein concentrations in a sample.

However, it is true that the Bradford assay is more accurate and reliable for measuring protein concentrations at low to moderate levels rather than at very high concentrations.

The Bradford assay is based on the binding of Coomassie Brilliant Blue dye to proteins. The dye undergoes a color change from brown to blue when bound to proteins, allowing for the measurement of protein concentrations. At low protein concentrations, the binding of the dye to proteins is well-calibrated and results in a linear relationship between protein concentration and color intensity, making it suitable for accurate quantification.

At high protein concentrations, the binding capacity of the dye may become saturated, leading to non-linear and less accurate measurements. The excess protein can also cause interference and affect color development. In such cases, dilution or alternative protein quantification methods may be more suitable, such as the BCA assay or the Lowry assay.

Therefore, while the Bradford assay can be used to measure protein concentrations across a range of concentrations, it is generally more reliable for low to moderate protein concentrations.

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#SPJ 6

Answer:

116.64 g

Explanation:

74.23÷14 This is # of moles .

# of moles for co = 5.302

Then mass of co2 = 116.64

none of the above is the answer i think?!

Answer:

none of the above

Explanation:

if we threw away less garbage it would just end up polluting somewhere else

if we threw away more garbage it would just add to the landfills

and if we pollute the land any more than we already have there's no point in even trying

therefore the most logical answer would b none of the above

Answer:

The answer is A

Explanation:

Answer:

D)All of the above

NaOH.

Na = Sodium which is in group 1 of periodic table which are alkaline metals. all the others are alkaline earths as they are all in group 2.