Which element does this atom represent?

Answer:

yes

Explanation:

The outermost shell of sodium contain only one electron . Due to incomplete octet (8electron in outermost shell ) sodium atom is unstable. Now the outermost shell of of Na+ contain 8 electron . due to completion of octate , Na+ is more stable

Answer:

Al

Explanation:

Aluminum, the 13th element on the Periodic Table, is a Post-Transition metal.

Answer:

PLANT CELLS- have cholorplasts, always have cell walls

Animal cellss- never have. Acell wall

Bacteria cells - are projaryotic sometimes have cell walls. Have nucleiod

Explanation:

The photosynthetic pigment chlorophyll is found in the chloroplast, an organelle that uses sunlight to produce energy and release oxygen from water. Organelles found in plant cells called chloroplasts use the photosynthetic process to change light energy into relatively stable chemical energy.

Plant cells are eukaryotic cells with a genuine nucleus and particular organelles to carry out particular tasks. Plant cells do, however, include several organelles that are unique from those seen in other eukaryotic cells.

An animal cell is a type of cell that is only found in animal tissues, as the name suggests. It is distinguished by having cell organelles that are encapsulated inside the cell membrane but without a cell wall.

PLANT CELLS- have chloroplasts, always have cell walls

Animal cells- never have. Acell wall

Bacteria cells - are prokaryotic and sometimes have cell walls. Have nucleoid

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Answer:

It will take Marvelous 160 miles per hour east to travel 21 miles.

Explanation:

Because 21 times 6= 160 and make sure to add the per hour east because thats the velocity.

Answer:

false

Explanation:

A time machine is a device which can transport an object or person back in time or in to the future.

Ali Razeghi is the person who invented the time machine.

Answer:

I think it is Plasma

Explanation:

Answer:

The ability to conduct electricity

Answer:

Good conductors of heat and electricity

Answer:

A will float on top of B.

Explanation:

B is more dense. example A is oil and B is water.

Answer:

[tex]\Delta p=-2.60bar\\ \\\Delta p=-0.260MPa[/tex]

Explanation:

Hello,

In this case, by using the Bernoulli equation:

[tex]p_1+\frac{1}{2}\rho v^2_1+\rho gh_1= p_2+\frac{1}{2}\rho v^2_2+\rho gh_2+\rho h_L[/tex]

Whereas [tex]h_L[/tex] accounts for the heat loss, so we can compute the change of pressure by:

[tex]p_1 +\frac{1}{2}\rho v^2_1+\rho gh_1= p_2+\frac{1}{2}\rho v^2_2+\rho gh_2+\rho h_L\\\\p_2-p_1=\frac{1}{2}\rho v^2_1+\rho gh_1-\frac{1}{2}\rho v^2_2-\rho gh_2-\rho h_L\\\\\Delta p=\rho *[\frac{1}{2}(v_1^2-v_2^2)+g(h_1-h_2)-h_L ][/tex]

Thus, we must first compute the velocity inside the 5-cm section by using the continuity equation:

[tex]v_2=v_1\frac{A_1}{A_2}=v_1*(\frac{\pi d_1^2/4}{\pi d_2^2/4} ) \\\\v_2=1.2m/s*\frac{8cm}{5cm}=1.92m/s[/tex]

It means that the change in pressure in Pa turns out (density is 1500 kg/m³ given the specific gravity of the fluid):

[tex]\Delta p=1500\frac{kg}{m^3} *[\frac{1}{2}((1.2\frac{m}{s})^2-(1.92\frac{m}{s})^2)+9.8m/s^2(0m-15.0m)-25\frac{m^2}{s^2} ]\\\\\Delta p=1500\frac{kg}{m^3}*(-1.1232\frac{m^2}{s^2} -147\frac{m^2}{s^2} -25\frac{m^2}{s^2} )\\\\\Delta p=-259684.8Pa[/tex]

Therefore, the change in pressure in bar and MPa turns out:

[tex]\Delta p=-259684.8Pa*\frac{1bar}{1x10^5Pa}=-2.60bar\\ \\\Delta p=-259684.8Pa*\frac{1MPa}{1x10^6Pa}=-0.260MPa[/tex]

Such negative sign means that the pressure at the 5-cm section is lower than the pressure at the 8-cm section.

Best regards.

Answer:

Mixture is the answer.

Answer:

-1

Explanation:

Electrons have a negative charge, so when you add an electron to an element their charge goes down by 1.

Answer:

d.miscible

Explanation:

If two liquids are completely miscible, no interfacial tension exists between them.

Interfacial tension is the force of attraction between between the molecules of a fluid that are in contact. This tension forms thick skin at the interface.

In miscible liquids, in which one liquid completely dissolves in another, there is no interfacial tension.

Interfacial tension does not allow miscibility of fluids as the tension between the interface is too great.

So, if two liquids are miscible, there is no interfacial tension between them.

Answer:

(Ba) balium

hope this helped.. :^)

Answer:

it's Ba which is balium

Explanation:

I hope I helped.. :^)

Answer:

C

Explanation:

Noble gas or inert gas

Answer: C: Noble Gas

Hope this helps :)

Answer:

Answer:

A & B

Explanation:

Noble Gases are the least reactive as they have a full valence shell (and are stable)

Answer:

300g/mL^3

Explanation:

300 grams divided by 10 mL equals 30g/mL^3, apologies if I'm incorrect.

Answer:

A

Explanation:

Water freezing and thawing involves no chemical change.  It has a chemical formula of H2O whether it is ice or water.

Complete question is;

In the movie, "Raiders of the Lost Ark", Indiana Jones takes a gold idol from a cave. The statue is resting on a table which is rigged with a weight sensor. The weight sensor can detect when the weight is removed and will set off a series of unfortunate accidents. To prevent this from happening, Indiana replaces the gold idol with a bag of sand. The volume of the gold idol is approximately 1.0 L. The density of gold is 19.3 g/mL and the density of sand is 2.3 g/mL.

A) Assuming the idol is pure gold, what volume would the bag of sand have to be in order to weigh exactly the same as the idol and not set off the boo by-traps?

B) Let’s assume that Indiana is successful in removing the idol and returning with it to his laboratory. He decides to determine if it is really pure gold. He weighs the idol and measures the volume by a water displacement method. The results are: mass = 16.5 kg and volume of water displaced = 954 mL. Is the idol made of pure gold? Explain your answer based on the experimental results.

Answer:

A) Volume of sand = 8.391 L

B) The idol is not made of pure Gold.

Explanation:

A) We are given:

volume of the gold idol = 1 L = 1000 mL

Density of gold = 19.3 g/mL

Density of sand = 2.3 g/mL

So; mass of gold is gotten from the equation;

Density = mass/volume

Mass = density × volume

Mass of gold = 19.3 × 1000 = 19300 g

Now, we want to find what volume would the bag of sand have to be in order to weigh exactly the same as the idol.

Thus, volume of sand = 19300g/23 g/mL = 8391 mL or 8.391 L

B) We are now told the gold idol has;

mass = 16.5 kg = 16500 g

volume of water displaced = 954 mL.

Thus;

Density = 16500/954 = 17.3 g/mL

Now this value of 17.3 g/mL is lesser than that of pure gold given as 19.3 g/mL, it implies that the idol is not made of pure gold.

Determine the mass of the gold statue using its volume and density.

[tex]\to density = \frac{mass}{volume} \\ or \\ \to mass = density \times volume[/tex]

Converting the statue's volume from L to mL so that the volume unit and density unit correspond.

Calculating the mass of the statue:

[tex]\to 19.3\ \frac{g}{mL} \times 1000\ mL = 19,300\ g\\\\[/tex]

The weight of the sand must be the same as the weight of the statue, which is [tex]19,300\ g\\\\[/tex]

Calculate the volume of sand required using the mass and density of the sand.

[tex]\to density = \frac{mass}{volume} \\ or \\ \to mass = density \times volume[/tex]

Calculating the volume of required sand:

[tex]\to \frac{19,300\ g}{23 \ \frac{g}{mL}} = 8391\ mL \ or\ 8.391\ L[/tex]

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Answer:

85.9%

Explanation:

There are two reactions to take into consideration for this problem:

The first one is the reaction of limestone with HCl:

      1) CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O

While the second one is the titration of HCL with NaOH:

          2) HCl + NaOH → H₂O + NaCl

So first we calculate the number of HCl moles added:

A number of those 5.175x10⁻³ moles reacted with limestone while the remaining excess reacted with NaOH.

The number of NaOH moles used in the titration is:

We know from equation 2) that the moles of NaOH are equal to the moles of HCl in the titration process.

That means that the number of HCl moles that reacted with CaCO₃ in the limestone sample is:

Now we use that number of HCl in equation 1) to calculate the number of CaCO₃ moles, which we then convert to grams using its molecular weight:

Finally we calculate the CaCO₃ percentage in the sample:

Answer:

the answer is ionic

Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom. ... The atom that loses the electrons becomes a positively charged ion (cation), while the one that gains them becomes a negatively charged ion (anion). A brief treatment of ionic bonds follows

Answer:

B) Lithium ions have 1 positive charge, and phosphorus ions have 3 negative charges.

Explanation:

Lithium phosphide is an ionic compound in which lithium ions have 1 positive charge, and phosphorus ions have 3 negative charges. Therefore, option A is correct.

An ionic compound is a type of chemical compound that is composed of ions held together by electrostatic forces of attraction. These compounds are typically formed through the transfer of electrons between atoms, resulting in the formation of positively charged cations and negatively charged anions.

Ionic compounds often form crystal lattice structures due to the strong electrostatic forces between the ions. They tend to have high melting and boiling points.

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