Which of the following elements has the lowest ionic radius?

Answer:

d. never alters

Explanation:

physical is how it looks, not its chemical makeup... good luck bro :)

Answer: Fe(s) —> Fe2+ (aq) + 2e-

Explanation:

Answer:

An increase in soil temperature increases microorganism growth because the rate of decomposition increases.

Explanation:

An increase in soil temperature increases microbial activities and the activity of extracellular enzymes that degrade polymeric organic matter within the soil. An increase in the soil microbial activities means that the decomposition rate and microorganism growth would increase. Increase in the activity of extracellular enzymes that degrade polymeric organic matter within the soil also means that more carbon dioxide would be produced and released into the atmosphere.

Answer:

It gets compacted and forms sedimentary rock.

Explanation:

After a rock is weathered, one thing that can happen is for it to get compacted and form sedimentary rock.

Answer:

When the magma reaches it boiling point and it starts to rise

Explanation:

Answer:

15.30 ×10²³ molecules of ammonia

Explanation:

Given data:

Volume of ammonia = 57.0 L

Temperature = standard = 273 K

Pressure = standard = 1 atm

Number of molecules of ammonia = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

1 atm ×57.0 L = n ×0.0821 atm.L/ mol.K   × 273 K

57.0 L.atm =  n × 22.41 atm.L/ mol

n = 57.0 L.atm/22.41 atm.L/ mol

n = 2.54 mol

Number of molecules of ammonia:

1 mole of gas have 6.022 ×10²³ molecules of ammonia.

2.54 mol ×6.022 ×10²³ molecules / 1 mol

15.30 ×10²³ molecules

PbO2 (s) + 4 HCl (aq) → PbCl2 (s) + Cl2 (g) + 2 H2O (l)

This is an oxidation-reduction (redox) reaction:

PbIV + 2 e- → PbII

(reduction)

2 Cl-I - 2 e- → 2 Cl0

(oxidation)

PbO2 is an oxidizing agent, HCl is a reducing agent.

Answer:

hydrogen and oxygen>water

Answer:

3.2 x 10²¹molecules

Explanation:

Given parameters:

Volume of nitrogen gas = 120cm³

Unknown:

Mass of nitrogen gas = ?

Number of molecules  = ?

Solution:

To solve this problem, note that;

   1 mole of gas occupies a volume of 22.4L at STP

  Now;

   convert 120cm³ to L ;

           1000cm³  = 1L

           120cm³ gives 0.12L

    Since;

            22.4L of gas has 1 mole at STP

            0.12L of gas will have [tex]\frac{0.12}{22.4}[/tex]   = 0.0054mole at STP

So;

    Mass of N₂  = number of moles x molar mass

 Molar mass of N₂  = 2(14) = 28g/mol

    Mass of N₂  = 0.0054 x 28  = 0.15g

Now;

        1 mole of a gas will have 6.02  x  10²³ molecules

      0.0054 mole of N₂ will contain   0.0054 x  6.02  x  10²³ =

                          3.2 x 10²¹molecules

Answer:

A. 0.00420 J/(gi°C)

Explanation:

i got it rigt

Answer:

Neutral carbon-12 (or any carbon atom) has 6 electrons with a total negative charge of 6e- orbiting a nucleus with a total positive charge of 6e+, so that the total net charge is zero. The nucleus is made up of 6 protons, each with a positive charge of e+, and 6 neutrons, each with zero charge.

Explanation:

Answer:

Neutral Carbon-12 Atom

Answer:

B) heterotrophs

Explanation:

hetero meaning other or different from its own species

Answer:

Answer:

♡ hi fairy ♡

-- the answer is heterotrophs

~ madeline ✧･ﾟ: *✧･ *:･ﾟ✧*

Explanation:

Answer: C. There is more plate movement in California.

Explanation:

Answer:

a game made by valve

Explanation:

its a 10/10 game

Answer:

D

Explanation:

Answer:

When universal indicator is added to a solution, the color change can indicate the approximate pH of the solution. Acids cause universal indicator solution to change from green toward red. Bases cause universal indicator to change from green toward purple.

Explanation:

The universal indicator turns the solution in red color then the solution must be strongly acidic. Therefore, option (B) is correct.

A universal indicator can be described as a pH indicator made of a solution of various compounds that exhibits many smooth color changes over a wide range of pH values to indicate the acidity or basicity of the solution.

The chemical indicator is a substance that indicates the color change, or the presence/ absence of a threshold amount of a chemical species, such as an acid or base in a solution.

There are many kinds of indicators such as Universal indicator, methyl orange, litmus, phenolphthalein, and bromothymol blue. They are utilized to tell the acidity and basicity of the solution by color change.

In an acidic medium, the universal indicator will show colors such as red, orange, yellow, orangish-yellow, etc. In the basic medium, the universal indicator will change its color to blue-violet or purple. In a neutral medium, it will show green color.

Therefore, the given color is red so the solution is strongly acidic as it has a very low pH value.

Learn more about the universal indicator, here:

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Answer:

4.44 Hz

Explanation:

v = frequency x wavelength = 3 x 10^8 m/s = frequency x 6.75x 10^7 m

frequency , f= [tex]\frac{3*10^8 }{6.75* 10^7}[/tex] =4.44 Hz

ANSWER:

+2

Explanation:

Recognize CuSO 4 as an ionic compound containing a copper ion and a sulfate ion, SO42-. To form an electrically neutral compound, the copper must be present as a Cu2+ ion. The oxidation state is therefore +2.

Answer:

Explanation:

2KClO₃ = 2KCl + 3O₂

2 moles of potassium chlorate gives 3 moles of oxygen gas

20 moles of potassium chlorate will give 30  moles of oxygen gas .

30 moles of oxygen = 30 x 6.02 x 10²³ molecules of oxygen .

= 180.6 x 10²³ molecules of O₂ .

Answer:

B

Explanation:

None of the other responses doesn't seem right. A is to broad someone can be a scientist and might not be highly educated. C not every scientist studies this field so no. Same goes for D

Answer:

B

Explanation:

The order of abundance from greatest to least in gases found in Earth's

atmosphere is nitrogen, oxygen, carbon dioxide.

There are various gases present in the atmosphere such as nitrogen,

oxygen, carbon dioxide etc. Each of them have their important functions in

ensuring the ecosystem is balance and for survival of the organisms present.

The most abundant element is Nitrogen which accounts for about 78

percent of air. Oxygen is the second most abundant with 21 percent present

in air. Others such as carbon dioxide and inert gases represent the

remaining percentage present in air.

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Answer: C. Gaining 5 electrons

Explanation: Aluminium has 3 valence electrons to have a full outer shell it would need 5 to become an octet (8).

Physical weathering is caused by physical processes such as changes in temperature, freezing and thawing, and the effects of wind, rain and waves.

hope this helped

Answer:

22g

Explanation:

Given parameters:

Mass of element A = 18g

Mass of element B  = 4g

Unknown:

Mass of compound formed = ?

Solution:

 The reaction equation is given as;

          A   +   B   →  AB

According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another".

Simply mas is conserved and the mass of the reactants is the same as the mass of the product that forms.

  Mass of reactants  = mass of A + mass of B = 18g + 4g  = 22g

 So;

  Mass of product AB = 22g

Answer:

P = 4.92 atm

Explanation:

Given data:

Number of mole of oxygen = 0.352 mol

Volume of gas = 1.75 L

Temperature = 25°C

Pressure exerted by gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

25+273 = 298 K

P × 1.75 L = 0.352 mol  × 0.0821 atm.L/ mol.K   ×298 K

P = 8.61 atm.L /  1.75 L

P = 4.92 atm

Answer:

c

Explanation: