You would expect magnesium to be most similar in properties to
A. silicon.
B. calcium.
C. potassium.
D. sulfur.

Answer:

B

Explanation:

Answer:

3

Explanation:

Data obtained from the question include:

Concentration of NO, [NO] = 0.1M

Concentration of NOBr, [NOBr] = 0.1M

Concentration of Br, [Br2] = 3M

Equilibrium constant, Kc =..?

The equilibrium constant, Kc is simply the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient.

Thus, the equilibrium constant, Kc for reaction can be obtained as follow:

2NOBr <==> 2NO + Br2

Kc = [NO]² [Br2] /[NOBr]²

[NO] = 0.1M

[NOBr] = 0.1M

[Br2] = 3M

Kc =..?

Kc = [0.1]² [3] /0.1]²

Kc = 3

Therefore, the equilibrium constant Kc, for the reaction is 3.

Answer:

3

Explanation:

Answer:

34.08 g

Explanation:

Take the atomic mass of N=14.0, H=1.0/

no. of moles=mmass/molar mass

no. of moles of N2 used = 28.02 / (14x2)

=1.0007mol

From the equation, the mole ratio of N2 : NH3 = 1: 2,

so one mole of N2 produces 2 moles of NH3.

Using this ratio, we can deduce that the no. of moles of NH3 = 1.0007x2

= 2.001428mol

mass = no. of moles x molar mass

Hence,

mass of NH3 produced = 2.001428 x (14+1x3)

= 34.03

≈C

Answer:

The final temperature of the bomb calorimeter is 82.98°C

Explanation:

The given information are;

The mass of the propane sample =  10.0 g

The heat capacity of the bomb calorimeter = 8.0 kJ/°C

The molar heat of combustion of propane is -2,222 kJ/mol.

The starting (initial) temperature of the water, T₁ = 20°C

The final temperature of the bomb calorimeter = T₂

The molar mas of propane = 44.1 g/mol

The number of moles, n, of propane present in 10.0 g of propane is found as follows;

[tex]Number \ of \ moles \ of \ propane, \ n = \dfrac{Mass \ of \ propane}{Molar mass \ of \ propane} = \dfrac{10}{44.1} = 0.227 \ moles[/tex]Which gives;

The heat, Δh, released from the combustion of 10.0 g of propane = 0.227 × -2222 kJ/mol  

Δh = -503.85 kJ/mol  

Heat gained by the calorimeter = Heat released from the combustion of 10.0 g of propane = 503.85 kJ/mol  

Change in heat, Δh[tex]_c[/tex] in the calorimeter = Heat capacity × Temperature change

Δh[tex]_c[/tex] = m × C

503.85 kJ/mol = 8.0 kJ/°C × (T₂ - 20°C)

T₂ = -503.85 kJ/mol/(8.0 kJ/°C) + 20°C = 82.98°C

The final temperature of the bomb calorimeter = 82.98°C

Answer:

controlled variable is a variable that is kept constant during a controlled experiment and covalent bond is a chemical bond formed when two atoms share electrons.

Explanation:

Answer:

D. 1:1

Explanation:

For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).

So, the mole ratio of chlorine to calcium chloride is 1:1.

Hope this helps. :)

The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.

Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.

Given chemical reaction is:

Ca + Cl₂ → CaCl₂

From the stoichiometry of the given reaction it is clear that,

1 mole of chlorine = reacts with 1 mole of calcium chloride

So, mole ratio = Chlorine / calcium chloride = 1:1

Hence required mole ratio is 1:1.

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Answer:

The answer to your question is given below

Explanation:

In this reaction, the calcium metal, Ca loses two electrons to form calcium ion, Ca^2+ and two fluorine atoms, F receives the two electrons to form two fluoride ion, F^-.

This is illustrated by the following equation:

Ca —> Ca^2+ + 2e

2F + 2e –> 2F^-

Ca + 2F + 2e —> Ca^2+ + 2F^- + 2e

Cancel out 2e

Ca + 2F —> Ca^2+ 2F^-

Thus, the electronic configuration can be written as follow:

Before combination:

Calcium, Ca (20) => 2, 8, 8, 2

Two fluorine atom, F (9) => 2, 7 and 2, 7

After combination:

Calcium ion, Ca^2+ => 2, 8, 8

Two fluoride ion, F^- => 2,8 and 2,8

Answer:

We can seprate oil and water by the process of seprating funnel

Answer:

Solar elevation.

Ozone.

Cloud cover.

Ground surface reflectivity.

Altitude.

Aerosols and pollutants.

Direct and diffuse UV.

I'm not sure if this was what you were looking for, but if it helps please mark me as brainliest.

Answer:

The second on, A man who works as a computer programmer and sits at desk magority of the day.

Explanation:

Answer:

Explanation:

The only answer I can think as being possible is the last one. Pesticides are chemicals that go after unwanted animal life. They do not know that they should not attack human beings.

Infertility could very well be one of the side effects of a pesticide. There are others as well. Some pesticides go after the central nervous system (think mice and rats) and those are dangerous to use and to leave around.

The others all involve occupations that either require authentic abilities or mental astuteness. Neither should affect a man's ability to reproduce.

Answer: it’s S

Explanation:

The element with electronic configuration of 1s²2s²2p⁶3s²3p⁴ is sulphur (S)

The correct answer to the question is Option C. S

Electronic configuration is simply defined as the arrangement of electrons around the nucleus of an atom.

With the electronic configuration of an element, we can obtain the name of the element by simply obtaining the total number of electrons in the shells and comparing it with those in the periodic table.

From the question given above,

Electronic configuration => 1s²2s²2p⁶3s²3p⁴

Total electron = 2 + 2 + 6 + 2 + 4 = 16

Thus, the element has 16 electrons. This is assumed to be atomic number of the element.

Comparing the atomic number of the element (i.e 16) with those in the periodic table, the element is Sulphur with the symbol S.

Therefore, the element with electronic configuration of 1s²2s²2p⁶3s²3p⁴ is sulphur (S)

Option C. S gives the correct answer to the question.

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Answer:

RCOOR

Explanation:

Odyssey ware

RCOOR is the functional group for an ester. An ester is an organic molecule created when an acid and an alcohol interact. The general structure of the compound is RCOOR, where R is an aryl or alkyl group.

This functional group is made up of an alkyl or aryl group (R) and a carbonyl group (C=O) linked to an oxygen atom. Two additional carbon atoms, one of which is a member of the carbonyl group and the other of which is a member of the alkyl or aryl group, are joined to the oxygen atom.

The connection between the oxygen atom and the hydrogen atom of the acid is broken during the interaction of an acid with an alcohol to create an ester.of a fresh connection between the oxygen atom and the alcohol's alkyl or aryl group. As a result, the RCOOR functional group is created.

Esters are significant organic substances with many different uses. They serve as solvents and are employed in the synthesis of flavours, perfumes, polymers, medicines, and other products. They are also employed in the creation of fragrances and cosmetics, as well as as lubricants. Other organic compounds can be made using esters as intermediates.

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Answer:

52. The alcohol USED => methanol, CH3OH

The carboxylic acid USED => propanoic acid, CH3CH2COOH.

53. The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Explanation:

52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:

CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O

The alcohol used: methanol, CH3OH

The carboxylic acid used: propanoic acid, CH3CH2COOH.

53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react

Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:

HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O

The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Answer:

3.79 g of N2.

Explanation:

We'll begin by writing the balanced equation for the reaction.

This is given below:

4NH3 + 3O2 → 2N2 + 6H2O

Next, we shall determine the mass of O2 that reacted and the mass of N2 produced from the balanced equation.

This is illustrated below:

Molar mass of O2 = 16x2 = 32 g/mol

Mass of O2 from the balanced equation = 3 x 32 = 96 g

Molar mass of N2 = 2x14 = 28 g/mol

Mass of N2 from the balanced equation = 2 x 28 = 56 g

Summary:

From the balanced equation above,

96 g of O2 reacted to produce 56 g of N2.

Finally, we shall determine the mass of N2 produced by reacting 6.50 g of O2.

This can be obtained as follow:

From the balanced equation above,

96 g of O2 reacted to produce 56 g of N2.

Therefore, 6.50 g of O2 will react to produce = (6.50 x 56)/96 = 3.79 g of N2.

Therefore, 3.79 g of N2 were obtained from the reaction..

Answer:

2 boxes

Explanation:

==>Given that:

Box A = 10 grams

Box B = 5 grams

Box C= 1 A and 1 B = 15 grams

==>Required:

Number of boxes of B that would make 30 grams of C

==>Solution:

We know that, 1 box of B would give us 15grams of of C when mixed in the right proportion with 1 box of A.

thus,

1 box of B => 15 grams of C

x box of B => 30 grams of C

Therefore x = (30*1)/15

x = 30/15

x = 2

2 boxes of B would be required to make 30 grams of C

Answer:

Explanation:

a )

3NO₂(g) + H₂O(l) — -→ 2HNO₃(aq) + NO(g)

3 x 46 g       18 g            2 x 63 g       30 g

138 g of NO₂ requires 18 g of H₂O

28 g of NO₂ requires ( 18 / 138) x 28

= 3.65 g of H₂O.

b )

18 g of H₂O produces 30 g of NO gas

15.8 g of H₂O produces ( 30/18 ) x 15.8

= 26.33 g of NO gas .

c )

138 g of NO₂ produces 126 g of HNO₃

8.25 g  of NO₂ produces (126 / 138 ) x 8.25

= 7.53 g of HNO₃

Answer:

Four ways to test a copper penny are given below:-

Explanation:

Answer:

it is 90.0

Explanation:

Answer:

they produce water and a neutral ionic compound called a salt. The reaction is called a neutralization reaction.

Explanation:

Answer:  1.5

Explanation:

The pH of a solution is given by the formular; pH = - log [ H+ ]. Therefore, for  H2SO4, it is;

pH = - log [ 3 x 10 ∧ -2]

     =  2   - log 3

     =  2 - 0.4771 = 1.5 approximately

Answer:

Cl₂ > Br₂ > I₂

Explanation:

An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.

Oxidizing ability decreases down the group.

Therefore Cl₂ > Br₂ > I₂

A chemical reaction has the equation 2NaCl(aq) + F₂ → 2NaF(s) + Cl₂ (g). The reaction type occur between NaCl and F₂ is Single displacement.

Hence, Option (B) is correct answer.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.

Now lets check all options one by one

Option (A): Double displacement

A double displacement is a chemical reaction in which elements are exchange between the two compounds.  In the given reaction F₂ is not a compound. so this reaction cannot occur

Hence, option (A) is incorrect.

Option (B): Single displacement

A Single displacement reaction is a chemical reaction in which one element replaces the another element in a compound.

In the given reaction F₂ element replaces with the element Na in a compound NaCl. So this reaction occur.

Hence, option (B) is correct.

Option (C): Synthesis

A synthesis reaction is a chemical reaction where two or more substances react to produce a new compound.

In the given reaction two products are formed NaF which is a compound and Cl₂ which is element. So this reaction cannot occur.

Hence, option (C) is incorrect.

Option (D): Decomposition

A decomposition reaction is a chemical reaction in which one reactant breaks down to form a two or more products.

In the given reaction two reactants are given NaCl and F₂. So this reaction cannot occur.

Hence, option (D) is incorrect.

Thus, from above conclusion we can say that The reaction occurs between NaCl and F₂ is single displacement reaction.

Hence, Option (B) is correct answer.

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Answer:

86.5%

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2Na + 2HF –> 2NaF + H2

Next, we shall determine the theoretical yield of the hydrogen gas, H2. This is illustrated:

From the balanced equation above,

2 moles of Na reacted to produce 1 mole of H2.

Therefore, 5.75 moles of Na will react to produce = (5.75 x 1)/2 = 2.88 moles of H2.

Therefore, the theoretical yield of Hydrogen gas, H2 is 2.88 moles.

Finally, we shall determine the percentage yield of Hydrogen gas, H2. This can be obtained as follow:

Actual yield of H2 = 2.49 moes

Theoretical yield of H2 = 2.88 moles

Percentage yield of H2 =.?

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 2.49/2.88 x 100

Percentage yield = 86.5%

Therefore, the percentage yield of Hydrogen gas, H2 is 86.5%.

Answer:

6.4

Explanation:  pH

+

pOH

=

14

So if  

pH

=

7.6

then  

pOH

=

14

−

pH

=

6.4

Explanation:

Wrote this out spaced so it's more clear.

Answer: Fossils of the species have never been found because:-

a. There were few members of the species.

d. Their bodies decompose quickly.

For an organism to become fossil it is important that it do not decompose before it get buried by sediments.

What are fossils?

A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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Answer: The answer is B and A.

Explanation:

I took the test!

Answer:

0.04 L

Explanation:

The following data were obtained from the question:

Concentration of stock solution (C1) = 18M

Volume of stock solution needed (V1) =?

Concentration of diluted solution (C2) = 1.5M

Volume of diluted solution (V2) = 0.5L

The volume of the stock solution needed can be obtain by using the dilution formula.

This is illustrated below:

C1V1 = C2V2

18 x V1 = 1.5 x 0.5

Divide both side by 18

V1 = (1.5 x 0.5)/18

V1 = 0.04L

Therefore, the volume of the stock solution needed is 0.04L.

Answer:

Correct, because B it is reported to the nearest miligram

Explanation:

4.6 rounded up is 5

Answer:

Option A, Tectonic plates above the currents move toward each other.

Option C, One plate will submerge beneath another plate.

Option D, A convergent boundary is formed at the site of the collision.

Explanation:

The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.

Answer:

- Tectonic plates above the currents move toward each other;

- One plate will submerge beneath another plate;

- A convergent boundary is formed at the site of the collision;

The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.

Answer:

The uncertainty principle

Explanation:

Essentially if you measure the momentum of the particle at a given point, then when you go to measure the position it has moved, thus you don't know the position. Vise versa if you measure the position you only capture a still frame of the particle and no information about it's momentum, which will have changed.

Answer: the uncertainly principle

Explanation:

it basically states you can not know both at the same time