which structure below represents the arrangement of atoms in pure copper ?.
​

Answer: A

Explanation:

Answer:

C

Explanation:

because the combustion reaction produce vapor water and CO2

Answer:

It helps shape, while holding and keeping organelles in their place.

Explanation:

Answer:

it holds the cell organelles

Explanation:

You are welcome

Answer:

6.02 X 1023 molecules

Explanation:

Answer:

when sodium reacts with chlorine atoms, sodium will give an electron which is negative charged to chlorine.it makes sodium(+) and chlorine (-)..then sodium will attract chlorine to form sodium chloride(NaCl)

Answer:

0.81mole

Explanation:

Given:

Volume of carbon monoxide  = 18dm³

Unknown

Number of moles of carbon monoxide  = ?

Solution:

To solve this problem;

           1 mole of any gas at rtp occupies a volume of 22.4dm³  

So;

           x mole of carbon monoxide will occupy a volume of 18dm³ at rtp

        22.4x  = 18

                x  = [tex]\frac{18}{22.4}[/tex]   = 0.81mole

Answer:

C.

Explanation:

Phase change is physical.  

When Nitrogen gas forms a liquid is a physical change because it was only a state change from solid to liquid. Therefore, option C is correct.

A physical change takes place when some of the features of the matter change but the identity of the material does not. Physical changes can be categorized as reversible and irreversible. For example, the melting of water is reversible since the melted ice can be refrozen.

Physical change can be described as a kind of change where only physical properties of matter such as solubility, color, odor, etc. can change. During physical changes in matter, there will be no chemical bonds are broken or formed between atoms in the molecule.

The chemical composition as well as the chemical nature of the material will remain unchanged while a physical change.  The molecules can rearrange without changing the internal chemical composition of matter.

Therefore, changing the state of nitrogen gas is a physical change.

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Answer:

C

Explanation:

A p orbital has the approximate shape of a pair of lobes on opposite sides of the nucleus.

Explanation:

A p orbital would have a du-bbell shape.

Options A and B show a spherical shape, which are for s orbitals.

Option D shows a double du-bbell / clover leaf shape, which is for d orbitals.

The answer is Option C.

P.S. The word is censored apparently, so be forgiving! Thanks~

Answer:

A.) an exothermic reaction that has an increase in disorder.

Explanation:

got it correct (unit review test)

Answer:

Carbon dioxide is a product (cellular respiration)

Carbon dioxide is a reactant(photosynthesis)

Carried out in animals(cellular respiration)

Carried out in plants(both)

Chemical reaction(cellular respiration)

Oxygen is a product(photosynthesis)

Oxygen is a reactant(cellular respiration)

Produces usable energy source(photosynthesis)

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Answer:attached is the correct answer

Explanation:

Photosynthesis and Respiration

Answer: Positive

Explanation: Just a guess

Answer:

Positive

Explanation:

1.47 × 10²¹ molecules OF₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

0.132 g OF₂

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of O - 16.00 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of OF₂ - 16.00 + 2(19.00) = 54.00 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.47204 × 10²¹ molecules OF₂ ≈ 1.47 × 10²¹ molecules OF₂

Answer:

F=500×3 = 1500 N

W = 1500×10 =15000 Nm

Answer:

 2Li   +   F₂    →    2LiF

Explanation:

The reaction expression is given as:

          Li   +   F₂    →     LiF

We are to balance the expression. In that case, the number of atoms on both sides of the expression must be the same.

 Let use a mathematical approach to solve this problem;

  Assign variables a,b and c as the coefficients that will balance the expression:

             aLi   +  bF₂    →     cLiF

Conserving Li: a  = c

                   F:  2b  = c

          let a = 1, c  = 1 and b  = [tex]\frac{1}{2}[/tex]  

  Multiply through by 2;

        a  = 2, b = 1 and c  = 2

               2Li   +   F₂    →    2LiF

Answer:

It makes chemicals hot or cold which makes chemicals react differently

Explanation:

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Answer:

40.34 g

Explanation:

First, we divide the heat to release by the heat of combustion to obtain the required moles of compound:

541.20 kJ/(1160.00 kJ/mol) = 0.4665 mol

So, we have to burn approximately 0.47 mol of the compound. We convert the moles to mass in grams by using the molar mass:

mass = molar mass x moles = 86.47 g/mol x 0.4665 mol = 40.34 g

Therefore, you must burn 40.34 grams of the compound to release 541.20 kJ of heat.

Solution :

Given :

length of silver cube = 2.28 cm

length of gold cube = 2.75 cm

Initial temperature = 82.8°C

Volume of silver cube is

Volume [tex]$=(\text{edge length})^3$[/tex]

               =    [tex]$(2.28)^3$[/tex]

                [tex]$= 11.8 \ cm^3$[/tex]

mass of silver cube

Mass, [tex]$m_s = \text{density} \times \text{volume} $[/tex]

                = 10.5 x 11.8

                = 123.9 g

Similarly, the volume of gold cube is

Volume [tex]$=(\text{edge length})^3$[/tex]

               =    [tex]$(2.75)^3$[/tex]

                [tex]$= 20.79 \ cm^3$[/tex]

mass of gold cube

Mass, [tex]$m_g = \text{density} \times \text{volume}$[/tex]

                = 19.3 x 20.79

                = 401.247 g

Now

heat lost by silver and gold cube = heat gained by water

∴[tex]$m_g .c_g \Delta T + m_s .c_s \Delta T = m_w.c_w \Delta T$[/tex]

[tex]$m_g .c_g (82.8- T) + m_s .c_s (82.8- T) = m_w.c_w (T - 20.2)$[/tex]

[tex]$401.247 \times 0.1264 (82.8- T) + 123.9 \times 0.2386 (82.8- T) = 111.5 \times 4.184 (T - 20.2)$[/tex]

Now solving the equation

[tex]$50.71 (82.8- T) + 29.56 (82.8- T) = 466.51 (T - 20.2)$[/tex]

Final temperature, T = 31.27°C

Answer: A. AB+C->CB+A

Explanation:

The chemical reaction includes the reactant and products. The single replacement reaction can be given as AB + C → CB + A. Thus option a is correct.

A single replacement reaction is the exchange reaction that involves the substitution of a single element of the reactant with another element of the reactant species.

The reaction between zinc and copper chloride is a single replacement reaction as copper is replaced by zinc in the copper chloride compound to produce zinc chloride and copper.

Therefore, option A. AB + C → CB + A is the single replacement reaction.

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x CO₂  = 0.236

x H₂  = 0.764

Given

P CO₂ = 217 mmHg

P H₂ = 703 mmHg

Required

The mole fraction

Solution

Dalton's law :

The total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases  

Can be formulated:  

P tot = P1 + P2 + P3 ....  

P tot for the mixture :

= 217 mmHg + 703 mmHg

= 920 mmHg

Mole fraction of each gas :

x CO₂ = 217 mmHg/920 mmHg = 0.236

x H₂ = 703 mmHg/920 mmHg = 0.764

Answer:

2.24dm³

Explanation:

Given parameters:

Mass of He = 40g

Unknown:

Volume of Helium  = ?

Solution:

To solve this problem, we convert the given mass to number of moles.

   Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

   molar mass of He  = 4g/mol

  Number of moles  = [tex]\frac{4}{40}[/tex]   = 0.1mole

So;

                  1 mole of gas at rtp occupies a volume of 22.4dm³

                0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³

A scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.

Creativity is a mental cognitive ability that involves the creation and/or discovery of a hidden process.

In science, creativity refers to the application of mental skills to create new experimental designs and extrapolate findings.

In conclusion, a scientist exploring evidence from other fields of science to support findings is an example of a scientist using creativity.

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Answer:

Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).

Explanation:

(NH₄)₂S

%N=  41.18%

%H =11.76%

%S=47.06%

Mg(NO₃)₂

%Mg=32.43%

%N=18.92%

%O=(64.86%

Given

(NH₄)₂S

Mg(NO₃)₂

Required

The percent composition

Solution

(NH₄)₂S MW=68 g/mol

%N=2. Ar N  / MW (NH₄)₂S x 100%

%N= (2.14/68) x 100% = 41.18%

%H =(8.1/68) x 100%=11.76%

%S=(32/68)x 100%=47.06%

Mg(NO₃)₂ MW=148 g/mol

%Mg=(2.24/148)x100%=32.43%

%N=(2.14/148)x100%=18.92%

%O=(6.16/148)x100%=64.86%

Answer:

second law

Explanation:

Answer: With power and energy, power is units of energy divided by time. The same difference as distance and velocity. The units of power are watts, the units of energy are joules.

Explanation:

abcdefghijklmnopqrstuvwxyzExplanation:abcdefghijklmnopqrstuvwxyz

Answer: Inorganic chemistry

Explanation:

Inorganic chemistry can be defined as the branch of chemistry which studies the behavior of the inorganic compounds. Inorganic compounds are those compounds which lack carbon hydrogen bonding. The carbon monoxide, carbon dioxide, sodium chloride and water are the examples of inorganic compounds. This branch also studies the effect of these chemical compounds on the living things. The water and salts are chemicals which regulate the chemical and physiological reactions in the body.