One atom of element A bonds with element E.

Answer:

Whether the forces of attraction is strong or weak is explained below in details.

Explanation:

There are three distinct kinds of intermolecular forces in expressions of energy. They are (strongest to weakest) dipole-dipole, hydrogen bonding, and Van der Waals' strengths. Intermolecular forces are weak related to intramolecular forces – the energies which endure a molecule collectively. For instance, the covalent bond, including distributing electron sets among atoms, is much more powerful than the forces impersonate among neighboring molecules.

Answer: D. Exactly one reactant is a solid, and exactly one product is a gas.

Explanation: PLATO

In the given reaction, there is only one reactant in solid state, that is copper carbonate and one gaseous product carbon dioxide. Hence, option D is the correct statement.

Copper carbonate is an ionic compound formed by the combination of copper metal and carbonate group. Copper metal loses two electrons to the carbonate group. It is a white powder and sparingly soluble in water.

The states of reactants and products in a reaction is represented  in brackets with the chemical formula of each compound. The reaction in which all the reactants are in same phase is called homogeneous.

The given reaction is an example of heterogeneous replacement reaction. The reaction includes the combination of solid copper carbonate with aqueous  HCl giving copper chloride solution and carbon dioxide gas. Thus, option D is correct.

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Answer:

6 moles of SO₃ formed.

Explanation:

Given data:

Number of moles of SO₃ formed = ?

Number of moles of oxygen react = 3 mol

Solution:

Chemical equation;

2SO₂+ O₂      →   2SO₃

now we will compare the moles of oxygen and sulfur trioxide.

                             O₂            :            SO₃

                               1             :             2

                               3            :           2/1×3 = 6 moles

Thus, six moles of SO₃ will formed.

Answer:

The exposure between the fuel rods and a neutron-absorbing material is increased.

Explanation:

The exposure between the fuel rods and a neutron-absorbing material is increased.

A nuclear reactor produces energy via a fission reaction. A fission reaction is a self sustaining reaction.

The nuclear fuel is bombarded with neutrons. The process produces more neutrons which continues the reaction.

In order to decrease the rate of reaction, control rods are inserted. These control rods are neutron-absorbing materials.

At night when demand for electricity decreases, the exposure between the fuel rods and a neutron-absorbing material is increased so that more neutrons are absorbed in order to decrease the rate of nuclear reaction.

The correct answers :

It increases with a decrease in the concentration of H₂(g).

It decreases with an increase in the concentration of S₂(g).

It decreases with an increase in the concentration of H₂(g).

Forward reaction : rate to form product

In equilibrium :

The product decreases ⇒ system will move from left to right(forward reaction)

The product increases ⇒ system will move from right to left(reverse reaction)

Answer:

Most foods are made out of carbon, oxygen, nitrogen and hydrogen

Explanation:

Answer:

because the minerals in the rock can't be used until they are separated

Answer:

Compound

Explanation:

Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g/mol respectively, 100 g of NaCl contains 39.34 g Na and 60.66 g Cl

Answer:

E = 19.89×10⁻¹⁶ J

λ = 1×10⁻¹ nm

Explanation:

Given data:

Frequency of xray = 3×10¹⁸ Hz

Wavelength of xray = ?

Energy of xray = ?

Solution:

speed of wave = wavelength × frequency

speed = 3×10⁸ m/s

3×10⁸ m/s  = λ ×3×10¹⁸ s⁻¹

λ = 3×10⁸ m/s  / 3×10¹⁸ s⁻¹

λ = 1×10⁻¹⁰m

m to nm:

λ = 1×10⁻¹⁰m×10⁹

λ = 1×10⁻¹ nm

Energy of x-ray:

E = h.f

h = plancks constant = 6.63×10⁻³⁴ Js

by putting values,

E = 6.63×10⁻³⁴ Js ×3×10¹⁸ s⁻ ¹

E = 19.89×10⁻¹⁶ J

Answer:

The answer is oxygen and silicon

Explanation:

I took the test and it was right

The answer is oxygen and silicon

Answer:

The recessive allele tends to be masked when it's in the presence of the dominant allele.

Explanation:

Many of our traits are affected by our genes. From each of our parents, we receive one copy of every gene. These copies are called alleles.

There are different types of relationships that can occur between alleles. One of them is called dominance. This occurs when one allele masks the other, not allowing its effect to be expressed. The allele that masks the other is called the dominant allele (A), and the masked one is called the recessive allele (a). This means that an individual needs to have only one dominant allele in order for its effect to be expressed (AA or Aa). The effect of the recessive allele will be expressed only when an individual has both recessive alleles (aa).

Answer:

Molecular formula = SF₆

Empirical formula is SF₆

Explanation:

Percentage of sulfur = 21.95%

Percentage of fluorine = 78.03%

Molar mass of compound = 146.1 g/mol

Empirical formula = ?

Molecular formula = ?

Solution:

Number of gram atoms of S = 21.95 / 32= 0.69

Number of gram atoms of F = 78.03 / 19 =  4.107

Atomic ratio:

                                  S                  :         F

                                0.69/0.69      :       4.107/0.69

                                     1                :         6

S : F =  1:6

Empirical formula is SF₆

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass :

32 + 19×6 = 146

n = 146.1 / 146

n = 1

Molecular formula = n (empirical formula)

Molecular formula = 1 (SF₆)

Molecular formula = SF₆

Answer:

there is no image

Explanation:

can you maybe ask the question again with the image?

Answer:

put an image please i don't understand

Answer:

Gasses and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter smaller waves. This it why we see a blue sky most of the time

Explanation:

I looked it up

Answer:

sun shine

Explanation:

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

Answer:

B 100 cm3

Explanation:

The balanced equation is given as;

2H2(g)+ O2(g) --> 2H2O(g)

From the reaction stochiometry, 2 cm3 of H2 would react with 1 cm3 of O2 to form 2 cm3 of H2O

Before Reaction --> 100cm3 of H2,   25cm3 of O2,  0cm3 of H2O

During Reaction --> 50cm3 of H2,    25cm3 of O2,   50cm3 of H2O

(Oxygen is sed uup in the reaction)

After Reaction   --> 50cm3 of H2,    0cm3 of O2,     50cm3 of H2O

Total volume left = Unreacted H2 (50cm3)  +  50cm3 of H2O formed

Total Volume left = 50  + 50  =  100cm3

The total volume of gas present at the end of the reaction is 100 cm³

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

The balanced equation is given as;

2H₂(g)+ O₂(g) → 2H₂O(g)

From the reaction stoichiometry, 2 moles of H₂ would react with 1 mole of O₂ to form 2 moles of H₂O

Before Reaction:  100cm³ of H₂,   25cm³ of O₂,  0cm³ of H₂O

During Reaction:  50cm³ of H₂,    25cm³ of O₂,   50cm³ of H₂O

(Oxygen is used up in the reaction)

After Reaction:  50cm³ of H₂,    0cm³ of O₂,     50cm³ of H₂O

Total volume left = Unreacted H₂ (50cm³)  +  50cm³ of H₂O formed

Total Volume left = 50  + 50  =  100cm³

Hence, The total volume of gas present at the end of the reaction is 100 cm³

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Answer:

if it forms from positive ions and has types of metallic bonds

Explanation:

Answer:

Energy is neither created nor destroyed.

Explanation:

The law of conservation of energy states that energy can neither be created nor be destroyed. The total energy of an isolated system remains conserved. It never gets 0. It changes from one form of energy to other but never vanishes.

Hence, the correct option is (d) "Energy is neither created nor destroyed"

Answer:

Empirical formula is C₅H₁₂O

Molecular formula = C₅H₁₂O

Explanation:

Given data:

Percentage of hydrogen =13.75%

Percentage of carbon = 68.11%

Percentage of oxygen = 18.15%

Empirical formula = ?

Solution:

Number of gram atoms of H = 13.75 / 1.01 = 13.6

Number of gram atoms of O = 18.15 / 16 = 1.13

Number of gram atoms of C = 68.11 / 12 = 5.68

Atomic ratio:

            C                      :      H               :         O

           5.68/1.13           :     13.6/1.13     :       1.13/1.13

            5                      :        12          :        1

C : H : O = 5 : 12 : 1

Empirical formula is C₅H₁₂O.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass :

5×12 + 12×1.01 + 16×1 = 88.12 g/mol

n = 88.17/ 88.12

n = 1

Molecular formula = n (empirical formula)

Molecular formula = 1 (C₅H₁₂O)

Molecular formula = C₅H₁₂O

Answer:

Bohr's greatest contribution to modern physics was the atomic model. The Bohr model shows the atom as a small, positively charged nucleus surrounded by orbiting electrons.

Explanation:

Answer: He proposed a theory for the hydrogen atom based on quantum theory

Explanation:

Answer:

Plants : Cactus, tumbleweed

Animals : camel, fennec fox

Answer:

Desert plant - Cactus & Tumbleweed

Desert animal - Camel & Scorpion

Answer:

a) 0.13 bar

b) 5.05 L

Explanation:

Let us take the mass of the mixture to be 100 g. Hence, 70% by weight of dioxygen corresponds to 70 g

Mass of dihydrogen = 100g - 70 g = 30g

Number of moles of dioxygen = 70g/32 g/mol = 2.2 moles of dioxygen

Number of moles of dihydrogen = 30g/2g/mol = 15 moles of dihydrogen

Total number of moles = 2.2 + 15 = 17.2 moles

Mole fraction of dioxygen = 2.2/17.2 = 0.13

Partial pressure = mole fraction * total pressure

Partial pressure of dioxygen = 0.13 * 1 = 0.13 bar

ii) number of moles in 8.8 g of CO2 = 8.8g/44g/mol = 0.2 moles

T = 31.1 + 273 = 304.1 K

P = 1 bar

V= ?

R = 0.083 bar L K-1 mol-1

From

PV=nRT

V = nRT/P

V= 0.2 * 0.083 * 304.1/1

V= 5.05 L

Explanation:

C. Plain paper indicator.

Litmus paper indcator can only tell you if the solution is acidic/neutral/alkaline, but not to what extent.

Answer:

in parallel

Explanation:

All of the home equipment in the residence are linked in parallel.

parallel association

electric appliances are connected in a parallel arrangement in a house circuit because every appliance gets complete voltage as resistance in a parallel association is low.

electric appliances are not linked in series because the cutting-edge can be the same thru all the home equipment connected but voltage increases if extra no. Of appliances are related. If the battery has low voltage than the full voltage it can short circuit.

research greater approximately the parallel.

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Answer:

V = 29.3 inch³

Explanation:

Given data:

Diameter of cone = 4 inch

Height of cone = 7 inch

Volume of cone = ?

Solution:

Formula:

V = πr²h/3

we calculate the radius from diameter,

r = 4 inch/2 = 2 inch

Volume:

V = 3.14 ×(2 inch)²  × 7 inch/3

V = 3.14 × 4 inch² × 7 inch/3

V = 29.3 inch³

which best explains why estuaries are an important habit for many Marine organisms in comparison to the open ocean?

there are more nutrients available in estuaries

Answer:

The correct symbol for Nitrogen is N.

Explanation:

I do A P E X.

Answer:

Law of conservation of matter

Explanation:

1. d.4.125 x 10²⁴ atoms

2. c. 487.73 g

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

1. 7 moles of phosphorus, so n=7, then number of atoms :

[tex]\tt N=7\times 6.02\times 10^{23}\\\\N=4.215\times 10^{24}[/tex]

2. 2.5 moles of Pt, so n=2.5, the mass of Pt(MW=195,084 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=2.5\times 195,084\\\\mass=487.73~g[/tex]