9. An element Q with electronic configuration 2.8, 2 reacts with elements R. with electronic configuration 2, 8, 7 to form an ionic compound. The likely formula of this compound is:​

Answer:

carbon with graphite as the allotrope

Answer:

The magnetic sector mass spectrometers use a bending magnet: When the ions or atoms enter the magnet, they are forced to bend, and the light ions bend sharper than the heavy ions, as a result of which they're separated into a spectrum, like a rainbow.

Explanation:

Hope This Helps!

Answer:

ruler

Explanation:

that's what we call a ruler

Answer:

2 centemeters and 8 milimeters

Explanation:

Answer:

True, typically, the nucleus contains more than 99.9% of the mass of an atom.

Explanation:

La cantidad de azúcar en la solución es 239.4 gramos. En este caso, el azúcar es el soluto, y el agua el solvente.

El azúcar es el soluto el cual se encuentra disuelto en una solución acuosa que posee una masa de 6.3 kilogramos.

Un kilogramo equivale a 1,000 gramos. Es decir, 1 Kilogramo (kg) = 1,000 gramos (gr).

Entonces, la cantidad de azúcar puede ser calculada utilizando la regla de tres simple >>

6,300 gr ________ 100 %

X ______________ 3.8 %

X = (3.8 x 6,300)/ 100 = 239.4 gr

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Answer:

to judge outcomes

Explanation:

Explanation:

1mm = 10^-3 micrometre

8.5 x 10^-3 mm = 8.5 x 10^-6 micrometre

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

[tex]a = \frac{f}{m} \\ [/tex]

m is the mass

f is the force

From the question

mass = 3.5 kg

force = 35 N

We have

[tex]a = \frac{35}{3.5} \\ = 10[/tex]

We have the final answer as

Hope this helps you

попробуйте запросить поисковую систему и скопируйте и вставьте вопрос

Explanation:

the option 2 is correct

metals tend to have lower ionizatiin energy than non metals

Answer: Well, I'd personally go with the tedious route and pick them all out by hand, but I know what doesn't really help. Just a suggestion though, sorry.

Explanation: Don't listen to my advice if you want any free time.

Answer:

Start by using a magnet to separate out the metal fillings.

Then put the mixture through a sieve to separate out the stones.

Then mix it into water and drain out the sand.

Finally, boil the water off to get the salt back.

Explanation:

The metal fillings should be magnetic, and so a magnet will attract only the metal and allow you to remove it.

Putting the mixture through a sieve will basically sift it, since the sand and salt will fall through the holes but the rocks will be too big.

Mixing the mixture into water will dissolve the salt but not the sand, allowing you to pour off the water and be left with sand.

Boiling the water will cause the H2O to become a vapor, while leaving the salt behind.

Answer:

there is nothing there

Explanation:

i don't see. anything

Answer:

sa gutan ko na nga para mabrainliest na sya

Room temperature fluorescence spectroscopy is a non-destructive technique used for analyzing carpet fibers at a crime scene and preserving evidence in the original form.

In investigations, it is often necessary to preserve the physical integrity of evidence so that it can be presented in court. It therefore becomes important to use methods of analysis that are non - destructive when analyzing the material.

One of the most useful non - destructive methods of analysis is room temperature fluorescence spectroscopy. This method of analysis is accurate, yet preserves the physical integrity of evidence.

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Answer:

Spectrometry.

Explanation:

The long ridiculous answer the person gave before me doesnt even fit.

Atomic radius decreases across the period and increases down the group.

The atomic radii is a periodic trend that decreases across the period and increases down the group. Periodic trends are properties of elements that increase or decrease down the group or across the period.

As more positive charges (protons) are added to the nucleus as we move across the period, the attractive force between electrons and protons increases. As such atomic radii decreases across the period.

Down the group, addition of more shells leads to increased electronic repulsion which causes that atomic radii of elements to increases as we move down the group.

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Answer:A compound is a combination or two or more elements held together by chemical bonds. Compounds can only be separated by chemical processes. Since chemicals are composed of different elements, determining the ratio between the elements can allow you to analyze how much of each compound is present. Such a process is also useful for analyzing chemical reactions that are being performed in chemistry experiments. Making connections between units and how elements combine to form compounds can help you to better understand their ratios.Hydrogen peroxide,H2 O2. There are 2 moles of hydrogen and 2 moles of oxygen giving us a ratio of 2:2. We can reduce this ratio by dividing both numbers by a factor of both of them.

Answer:

madami DA pat hung texture

I HOPE IT WILL HELP YOU.

Thank you.

TEDDYLOVER.

Answer:

It shuttles electrons between the cytochrome complex and photosystem I.

Explanation:

Answer:

Spending time preparing indicates a better diet,(eating veggies and fruits). The opposite if you spend no time or less than an hour preparing(you are more likely to spend money on fast food)

Answer:

here hope it helps can you mark me brainliest please

Answer:

CCl4 is a covalent bonded nonpolar molecule.

Explanation:

Although there is an electronegativity (small) difference between C and Cl, its structure with 4 chlorine atoms allows the polarity to be "canceled out." I have attached a picture of the molecule below where you can clearly see the dipole movement on either side gets canceled hence making it have no net dipole movement. Additionally, CCl4 has a total number of valence electrons to be 32. 7 for one chlorine atom and 4 for a carbon one. The octets are satisfied as well. It's covalent because carbon and chlorine are nonmetals.

Answer:

a.the smallest building blocks of matter

Explanation:

because atoms are the smallest building blocks of matter.

Answer:

There is an extra O2 molecule left over

Explanation:

Answer:

The density is the same, so

(6000 g)/V = 8.96 g/cm3

V = 6000/8.96 cm3 = 669.64 cm3

Explanation:

The shaking caused the temperature of the sand to rise because hey should notice an increase in sand temperature as the kinetic energy increases. This is due to the fact that the kinetic energy from their shaking is being converted to thermal energy in the sand.

The sand is a poor heat conductor because when the Sun warms it, the heat is not distributed evenly, making the surface hot. Also, because sand has a lower specific heat than water, when both are exposed to the same amount of light, the sand at the surface will experience a greater change in temperature.

When you rub your hands together, the action of scraping the surface of your skin back and forth against each other causes the molecules in your skin to move a little faster.

The faster that molecules move, the higher the temperature. So the friction of rubbing your hands together makes them feel warmer.

Thus, when you shake the sand the molecules move faster to make the temperature warmer.

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