Please explain thank you! Xoxo!

Answer:

Francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. It exists only in short-lived radioactive forms.

There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Francium  belongs to alkali metals group.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Francium is a radioactive element, the electronic configuration of Francium is [ R n] 7s¹. The number of electron in outermost shell s is 1. This shows that francium belongs to group 1 of periodic table that is alkali metals.

Therefore, Francium  belongs to alkali metals group.

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Answer:

fog

Explanation:

Answer:

Fog :)

Explanation:

:) :) :) :) :) :) :) :) :) :) :) :) :)

Explanation:

The region x of the atom shown is called the nucleus of the atom shown. The nucleus of an atom contains protons and neutrons.

The region y is the atomic orbital where electrons can be found.

Answer:

What What What

Explanation:

Answer:

HAPPY BIRTHDAY!

Explanation:

Answer:

Moving them farther apart

Explanation:

One can try to change the distance between the two positive charges in such a way that it increases the distance and decreased the electric force.

Answer:

moving them farther apart

Explanation:

aka B.

Hello! :)

[tex]\large\boxed{1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}}[/tex]

Chlorine is a halogen located in group 7A and period 3 of the periodic table.

We can write the electron configuration of this element. Since it is in period 3, the highest configuration level will be at 3.

Chlorine is also located in the p block (nonmetal) section of the table, so the final part of the written configuration will involve "3p".

Recall that:

S block: up to 2 electrons

P block: up to 6 electrons

Chlorine has 17 electrons

Fill in the order of s block to p block. The first level only goes up to an s block. The configuration should sum up to 17 total electrons in total.

We can write the configuration as:

[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}[/tex]

Actual yield : 45.752 g ⇒no option

Given

The theoretical yields of Cl₂ : 65.35 g and 68.08 g

Required

The actual yield

Solution

Reaction

4 HCl (aq) + MnO₂ (s) → MnCl₂ (aq) + Cl₂ (g) + 2H₂O (l)

Because there are two theoretical yields, then we can choose the smallest one because the value is usually determined from the limiting reactant (in this reaction the limiting reactant is MnO₂)

So 65.36 g is The theoretical yields of Cl₂

Then the actual yield :

[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\actual=\%yield\times theoretical\\\\actual=70\%\times 65.36=45.752[/tex]

Photosynthesis produces glucose and molecular oxygen. The bubbles formed here, is oxygen gas and which can be measured to determine the rate of photosynthesis.

Photosynthesis is a biochemical process by which plants produce energy and oxygen gas with the aid of light. Chlorophyll in green leaves are the photoactive substance which absorbs light energy.

The overall reaction of photosynthesis is written as below:

[tex]\rm 6H_{2}O (l) +6CO_{2} (g) \rightarrow C_{6}H_{6}O_{12}(aq) +6 O_{2} (g)[/tex]

Here, six moles of water and 6 moles of carbon dioxide reacts together to form glucose and 6 moles of oxygen.

The rate of a reaction can be determined by analyzing the product formed at regular interval. Therefore, by measuring the oxygen gas released from photosynthetic reaction in the form of bubbles the rate of reaction can be studied.

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Answer:

= 0.5 moles of water

[tex]formular \: mass \: of \: water \: = (2 \times 1) + 16 = 18 \\ 18g \: of \: water \: are \: weighed \: by \: 1 \: mole. \\ 9g \: will \: be \: weighed \: by \: \frac{9 \times 1}{18} \\ = \frac{9}{18} moles \\ = 0.5 \: moles \: of \: water[/tex]

Answer:

0.5 mole

Explanation:

m(h2o)=2×1+16=18g

n=m÷Me=9÷18=0.5mole

Answer:

Magma

Explanation: cuz S waves travel through solids water, soil, and air are not solids so ur answer is B; magma

Answer:

c. soil

Explanation:

this is the correct answer not the one above...

Answer:

It will become polar.

Explanation:

Look the image below. I know it's terrible, but I'll explain it:

ΔE is the electronegativity. The higher is the ΔE of a substance, the more it can attracts electrons.

Cl has more electronegativity than C and H. But it has, of course, the same amount of another Cl.

So, when we have a tetrahedral space disposition such as in the left draw, all the Cl cancels the others eletrostatic force. However, when we replace one Cl for H, then we will have a dipole moment pointing to the Cl who face the Hydrogen, as the right draw. The appearance of a resulting dipole indicates the existence of a polar compound.

Answer:

Chlorine is more likely to steal a valence electron from sodium.

Explanation:

Sodium is number 11 on the periodic table with one valence electron. Belonging to the first group, it's one of the alkali metal, which are known to be highly reactive. Chlorine is number 17 with seven valence electrons, and it's in the second-to-last group of halogens--also very reactive.

Considering that elements with one valence electron are just about 100% likely to give up electrons to reach a stable state, sodium would be the element that is more likely to lose its valence electron to chlorine. In other words, chlorine would be the electron thief.

Answer:

- A new substance was formed in the chemical change while no be substance was formed in the physical change

- The chemical change involved a change in chemical composition while the physical change involved no change in chemical composition

Please find the explanation below.

Explanation:

A physical change is a change that does not alter the chemical content of the substances involved, hence, no new substances are produced while a chemical change alters the chemical composition, hence, new substances results.

In this question,

- Water is heated till it forms steam is characterized as a physical change

- Lighted splint is applied to hydrogen gas to produce water in the form of steam is characterized as a chemical change.

- The first process is a PHYSICAL CHANGE because it involved only a change of state i.e. from liquid to gas, hence, no alteration to the chemical composition of the molecule and also no new substance is produced.

- The second process is a CHEMICAL CHANGE because there was a chemical combination of hydrogen gas and the oxygen in the lighted splint to yield water molecules ( a new substance). Therefore, it involved a chemical reaction and formation of a new substance

Answer: 2.0 atm

Explanation:

PV = nRT

P- the pressure of the gas

V- the volume it occupies

n- the number of moles of gas

R- the universal gas content

T- the absolute temp. of the gas

The pressure, in atmospheres, is exerted by 0.325 mol of hydrogen gas in a 4.08 L container at 35°C is 7.03atm.

The ideal gas law relates the pressure, volume, temperature, and number of moles of a gas through the equation:

PV = nRT

where P is the pressure in atmospheres, V is the volume in liters (L), n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin (K).

T = 35°C + 273.15 = 308.15 K

Substituting the given values into the ideal gas law equation, we get:

P × 4.08 L = 0.325 mol × 0.08206 × 308.15 K

Simplifying and solving for P, we get:

P = (0.325 mol × 0.08206× 308.15 K) / 4.08 L

P = 7.03 atm

Thus, the pressure exerted by 0.325 mol of hydrogen gas in a 4.08 L container at 35°C is 7.03 atm.

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Answer:

magnesium (Mg)

Explanation:

Answer:

Be (Beryllium)

Explanation:

Answer:

[tex]\boxed {\boxed {\sf About \ 37.1 \ grams \ of \ iodine }}[/tex]

Explanation:

To convert from atoms to grams, you must first convert atoms to moles, then moles to grams.

1. Convert Atoms to Moles

To convert atoms to grams, Avogadro's number must be used.

[tex]6.022*10^{23}[/tex]

This number tells us the number of particles (atoms, molecules, ions, etc.) in 1 mole. In this case, the particles are atoms of iodine.

[tex]\frac{6.022*10^{23} \ atoms \ I }{1 \ mol \ I}[/tex]

Multiply the given number of atoms by Avogadro's number.

[tex]1.76*10^{23} \ atoms \ I*\frac{6.022*10^{23} \ atoms \ I }{1 \ mol \ I}[/tex]

Flip the fraction so the atoms of iodine will cancel out.

[tex]1.76*10^{23} \ atoms \ I*\frac{ 1 \ mol \ I}{6.022*10^{23} \ atoms \ I}[/tex]

[tex]1.76*10^{23}* \frac{1 \ mol \ I}{6.022*10^{23} }[/tex]

Multiply so the problem condenses into 1 fraction.

[tex]\frac{1.76*10^{23} \ mol \ I}{6.022*10^{23} }[/tex]

[tex]0.2922617071 \ mol \ I[/tex]

2. Convert Moles to Grams

Now we must use the molar mass of iodine, which is found on the Periodic Table.

Use this mass as a fraction.

[tex]\frac{ 126.9045 \ g\ I }{ 1 \ mol \ I}[/tex]

Multiply this fraction by the number of moles found above.

[tex]0.2922617071 \ mol \ I*\frac{ 126.9045 \ g\ I }{ 1 \ mol \ I}[/tex]

Multiply. The moles of iodine will cancel.

[tex]0.2922617071 *\frac{ 126.9045 \ g\ I }{ 1 }[/tex]

The 1 as a denominator is insignificant.

[tex]0.2922617071 *{ 126.9045 \ g\ I }[/tex]

[tex]37.08932581 \ g \ I[/tex]

3. Round

The original measurement of 1.76*10^23 has 3 significant figures (1, 7, and 6). Therefore we must round our answer to 3 sig figs. For this answer, that is the tenths place.

[tex]37.08932581 \ g \ I[/tex]

The 8 in the hundredth place tells us to round the 0 up to a 1.

[tex]\approx 37.1\ g \ I[/tex]

There is about 37.1 grams of iodine in 1.76*10^23 atoms.

I think the correct answer of these qusion is 2

The question is incomplete, the complete question is;

Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption?

A.

fact

B.

hypothesis

C.

law

D.

observation

E.

theory

Answer:

B.

hypothesis

Explanation:

A hypothesis is an intelligent guess put forward to explain an experimental observation. It is a tentative explanation for a scientific observation which must be subjected to careful verification.

Giselle’s assumption that the gas evolved is oxygen is a hypothesis. It must now be tested carefully in order to verify if the hypothesis is true.

Answer:

A half life of element is 8.07 days

B iodine 131

C check equation in attached image

Explanation:

80/2 =40

40/2=20

20/2=10

10/2=5

5/2=2.5

After 5 half lives it becomes 2.5 kg

n is the number of half-lives that pass in a given period of time

n= period of time/ half-life

Half life =period of time / n

Half life = 40.35/5= 8.07 days

odine-131 → xenon-131 + beta particle

Answer:

no. of moles = measured mass of substance/ molar mass of the constituted elements

Explanation:

No. of moles of 2.0g NaCl= 2/(23+35.5) = 0.034mol

Answer: MgCl2

Explanation:

There will be two Chlorine atoms, and one Magnesium atom. The Mg atom will transfer one valence electron to each Chlorine atom to make them stable. I don't know the reaction that happens, I'm Sorryy. But yeah... have a nice day! :)

Answer:

it would decrease  /  increase with the mass

Explanation:

Answer:

Metals i guess

Explanation:

Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce. For example, copper produces a blue flame, lithium and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame.

Answer: ???

Explanation:???

Answer:

C₆H₆O₃

Explanation:

Calculation sequence:

% => grams => moles => reduce => empirical Ratio

Molecular multiple = Molecular Mass / Empirical Mass

  C: => 57.1% => 57.1 g => 57.1/12 = 4.7583

  H: =>  4.8% =>  4.8 g =>   4.8/1  = 4.8000

  O: => 38.1% => 38.1 g => 38.1/16 = 2.3813

TTL => 100%       100 g

Reduced Mole values =>

C : H : O => 4.7583/2.3813 : 4.8000/2.3813 : 2.3813/2.3813 => 2 : 2 :  1

∴ empirical formula => C₂H₂O

empirical formula weight => 2C + 2H + 1O = [2(12) + 2(1) + 1(16)] amu = 42 amu

molecular formula weight (given in problem) = 126 g/mole

The molecular formula is a whole number multiple of the empirical formula.

molecular multiple = 126 amu / 42 amu = 3

∴ molecular formula => (C₂H₂O)₃ => C₆H₆O₃