A duck migrates South for the winter about 3000 miles each year. It takes them about 65 hours to travel this distance. What is the velocity of the duck?

Explanation:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability

Answer:

[BaCl₂] = 1.42M

Explanation:

Given:    Na₂SO₄(aq) + BaCl₂(aq) => 2NaCl(aq) + BaSO₄(s)

The balanced equation shows a 1:1 reaction between Na₂SO₄(aq) & BaCl₂(aq) and means the moles of sodium sulfate used equals the moles of baium chloride used. The concentration is the theoretical mole value calculated divided by 0.050 Liters.

Na₂SO₄(aq) + BaCl₂(aq) => 2NaCl(aq) + BaSO₄(s)

Moles of Na₂SO₄(aq) = moles of BaCl₂(aq) = 10.09g/142.04g/mol = 0.071mole

∴ Molar Concentration of BaCl₂(aq) = moles BaCl₂/Volume of Soln in Liters

= 0.071mole/0.050Liters = 1.42M in BaCl₂.  

Answer:

carbon dioxide in the atmosphere

Explanation:

Carbon dioxide in the atmosphere is the major cause of greenhouse effect.

Greenhouse effect is the main cause of global warming.

Answer:

A.

Explanation:

I just know.

Answer:

a.

Explanation:

Answer:

I HOPE IT HELPED THANKS

Answer:

Average atomic mass  = 85.557 amu.

Explanation:

Given data:

Percent abundance of Rb-85 = 72.15%

Percent abundance of Rb-87 = 27.85%

Average atomic mass = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass = (72.15×85)+(27.85×87) /100

Average atomic mass =  6132.75 + 2422.95 / 100

Average atomic mass = 8555.7 / 100

Average atomic mass  = 85.557 amu.

Answer:

The correct answer is B)The systematic name is the metal name followed by the charge on the metal atom. It is written as a Roman numeral and is in parentheses.

The common name is formed from the Latin root followed by -ous for low charge form, -ic for high charge form

Answer:

22 electrons are in the compound CO2. And the correct answer is Phosphorus tribromide.

Explanation:

Answer:

b. aluminum

Explanation:

The specific heat capacity is defined as the amount of heat required to raise the temperature of 1g of a material in 1°C.

Thus, the sample with the higher specific heat capacity is the sample that will require more energy to increase its temperature in 1°C, suffering the smallest change in temperature.

Thus, is the aluminium with 0.900J/gK the element that is most likely to undergo the smallest change in temperature:

Answer:

A.- maintaining a positive attitude

Explanation:

The answer is very obvious you need to maintain a positive attitude while studying.

Answer:

A: maintaining a positive attitude

Explanation:

I myself have personal experience with all of these, and B,C,D just don´t seem like reasonable answers. If you wait until the last minute to start an assignment, chances are you won´t get it done. Listening to the television while studing is a pretty bad idea because you might get distracted. Never study when tired because if you´re tired the information might not stick in your head. The only answer left is A.

Answer:

CH2N2

Explanation:

To find the molecular formula, we must first find the empirical formula as follows:

28.57% C - 28.57g of Carbon

4.80% H - 4.80g of Hydrogen

66.64% N - 66.64g of Nitrogen

Next, we convert this mass values to mole by dividing by their respective atomic mass.

C = 28.57/12 = 2.38mol

H = 4.80/1 = 4.80mol

N = 66.64/14 = 4.76mol

Next, we divide each mole value by the smallest mole value (2.38mol)

C = 2.38mol ÷ 2.38 = 1

H = 4.80mol ÷ 2.38 = 2.01

N = 4.76mol ÷ 2.38 = 2

The empirical ratio of C, H and N is therefore 1:2:2. Hence, the empirical formula is CH2N2

To calculate the molecular formula;

(CH2N2)n = 42.04 g/mol

{12 + 1(2) + 14(2)}n = 42.04

{12 + 2 + 28}n = 42.04

{42}n = 42.04

n = 42.04/42

n = 1.00009

Since n = 1, molecular formula is CH2N2

Answer:

5

Explanation:

Answer:

9812

Explanation:

i think

Answer:

if im correct its b but im not 100 percent sure

Explanation:

Answer:

the answer is C

Explanation:

there is 1 purple and 2 blues

The  model which represents chemical formula of nitrogen dioxide is C.

Chemical formula  is a way of representing information about the proportions of elements which are present in a compound or molecule.It is generally written with the symbols of chemical elements. It also makes use of brackets and subscripts.

Number of atoms of each element is written as a subscript .Chemical formula makes use of no words . It is not the same as structural formula .Chemical formula in the simplest form is called as the empirical formula.

Drawbacks of chemical formula are that they do not provide information about the position of atoms and not also on the structure. Owing  to these reasons, chemical formula is not that informative as that of structural formula.

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Answer:

If sunspots are active, more solar flares will result creating an increase in geomagnetic storm activity for Earth.

Explanation:

I ask mom

Answer:

Total heat ≅ 49.07 kJ

Explanation:

Given that:

mass = 1.6 g = 0.016 kg

Initial temperature = - 16 ° C

final temperature = 112° C

specific heat for ice = 2.06 kJ/kgC

specific heat of water = 4.186 kJ/kgC

heat fusion of ice = 334 kJ/kg

specific heat for steam = 2.1 kJ/kgK

heat of vaporization of water = 2256 kJ/kg

To heat ice from -16 ° C to 0 ° C

Q₁ =  2.06 kJ/kgC × 0.016 kg ×  16 ° C

Q₁ =  0.52736 kJ

To melt Ice at 0° C

Q₂= 334 kJ/kg × 0.016 kg = 5.344 kJ

To heat water from 0° C to  100° C

Q₃ = 4.186 kJ/kgC × 0.016 kg  × 100° C

Q₃ = 6.6976 kJ

To vaporize water to steam at 100° C

Q₄ = 2256 kJ/kg × 0.016 kg = 36.096 kJ

To heat steam from 100C to 112° C

Q₅ = 2.1 kJ/kgC × 0.016 kg × 12 C

Q₅ = 0.4032 kJ

Total heat = Q₁ + Q₂ + Q₃ + Q₄  + Q₅

Total heat =  (0.52736 +  5.344 +  6.6976 + 36.096 + 0.4032) kJ

Total heat = 49.06816  kJ

Total heat ≅ 49.07 kJ

Answer:

its 2

Explanation:

boron has 6 neutrons and oxygen has 8 neutrons on avg.

the difference is 2 neutrons

Answer:

Pain

Explanation:

the pain depends on u banging your head

Answer: NO

Explanation:

Answer:

yes

Explanation:

Answer:

(D) (CH3CH2)2NH

Explanation:

In order to decide which base is strongest we need to calculate its PKb

PKb = -log [Kb]

A large Kb value and small PKb value gives the strongest base

 Compound                   Kb                           PKb      

(A) C6H5NH2 -         4 x 10^-10                      9.349

(B) NH3                     1.76x 10^-5                    4.754

(C) CH3NH2              4.4x 10^-4                     3.357

(D) (CH3CH2)2NH   8.6x 10^-4                     3.066

(E) C5H5N                  1.7x10^-9                      8.77  

Clearly (CH3CH2)2NH is the strongest base.

Answer:

A. star formation begins in a nebula.

Explanation:

Answer:

the oxidation number is -3

Taking into account the definition of oxidation number, the oxidation number for N in the compound NH₃ is -3.

The oxidation number is the charge that an atom has; is an integer that represents the number of electrons an atom puts into play when it forms a given compound.

In other words, the oxidation number of an element is a value that indicates the number of electrons that element gains or loses when it combines with another.

To determine the oxidation state it is necessary to know that The oxidation number of hydrogen in a compound is +1, except in metal hydrides, where is –1.

On the other side, the sum of the oxidation numbers of the existing elements in a chemical formula must add up to zero.

Then, considering the oxidation numbers of each element, multiplying it by the number of existing elements in the chemical formula and adding it and equaling it to zero, the value of the missing oxidation number can be obtained.

In this case, the oxidation numbers of nitrogen is calculated as:

NH₃: oxidation numbers of nitrogen + 3×(+1)= 0

Solving:

oxidation numbers of nitrogen + 3= 0

oxidation numbers of nitrogen = -3

Finally, the oxidation number for N in the compound NH₃ is -3.

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Answer:

Carbon Dioxide

Explanation:

Plants inhale Carbon Dioxide and exhale Oxygen

An exothermic reaction Produces energy

In an endothermic reaction, the energy of the products is more than the energy of the reactants.  and  Activation energy is always greater than the potential energy of the products

An endothermic reaction is a reaction which requires an external source of energy before the reaction will take place ( i.e. endothermic reaction absorbs energy in the form of heat from its surrounding ) while an exothermic reaction releases energy in the form of heat into the environment.

Activation energy is amount of energy required to start a reaction since an endothermic reaction absorbs energy from its environment to kick off its reaction, its activation energy is always higher than the potential energy of its products.

Hence we can conclude that An exothermic reaction Produces energy In an endothermic reaction, the energy of the products is more than the energy of the reactants.   and Activation energy is always greater than the potential energy of the products.

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Answer:

An exothermic reaction

✔ produces energy

.

In an endothermic reaction, the energy of the products is

✔ more than

the energy of the reactants.

Activation energy is

✔ always greater than

the potential energy of the products.

Explanation:

2023 edge

Answer:

It shows constant motion when a straight line( not parallel) is formed in distance time graph.

Answer:

60 meters

Explanation: