Mastering Problems
Balancing Chemical Equations (10.1)
71. Write skeleton equations for these reactions.
a. hydrogen iodide(g) → hydrogen(g) + iodine(g)
b. aluminum(s) + iodine(s) — aluminum iodide(s)
c. iron(II) oxide(s) + oxygen(g) -> iron(III) oxide(s)

Answer:

i have no clue

Explanation:

Answer:

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Explanation:

Answer:

A mid-ocean ridge is an underwater mountain range, formed by plate tectonics.Mid-ocean ridges represent one of the most important geologic processes shaping the Earth

Answer:

A). An atom is an indivisible hard-sphere.

Explanation:

The 'Atomic Theory' of Dalton is characterized as the earliest model(came in 1803) which described the atoms as the indivisible and resistant spheres. He used the example of watermelon to elaborate that the atoms of a specific element share similar characteristics and the atoms of distinct elements differ in their mass as well as their size. Thus, option A is the correct answer.

Answer:

D. 97%

Explanation:

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Answer:

d

Explanation:

Answer:

The melting point is when a solid is turning into a liquid, boiling point is when a liquid turns into a gas. The thing that is misleading is that they are both changing state because of heat.

Explanation:

When a solid melts into a liquid, the melting point has been reached, and when a liquid changes into a gas, the boiling point is reached.

The melting point is defined as the temperature at which solid and liquid phases are in equilibrium, whereas the boiling point is defined as the temperature at which a liquid's vapor pressure equals the external pressure.

What's confusing is that they're both changing states as a result of heat.

Find out more information about 'Melting point'.

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Answer:

Why science communication is important? In the world we live in, not only does pursuing science matter but communicating about it effectively is important as well. Communicating about science is crucial, whether we communicate about it online or face to face, communication about the scientific facts is vital for the scientific community. This is especially important now when many question scientific methods, research, and results. We are not only talking about communication about science between academics, scientists and corporations, but we are also talking about the gap between the scientific world and non-scientific community.

true

The given statement is true.

• The atomic model of Bohr was based on the model given by Rutherford as he clarified the location of electrons.

• Based on Bohr's model, the electrons only at the fixed distances from the nucleus orbit around it known as the energy levels.  

• The work of Bohr illustrates the significance of communication in science as it would not be possible without the contribution of other scientists.  

• The atomic model of Bohr was built upon the atomic models of other scientists, mainly Rutherford.  

Thus, the given statement is true.

To know more about:

https://brainly.com/question/1862481

Answer:

Carbon dioxide

Water

Glucose

Answer:

Answer:

Answer:

Acronym  Elements Symbols

He Hydrogen H

has Helium He

light Lithium Li

brain Beryllium Be

but Boron B

can Carbon C

not Nitrogen N

offer Oxygen O

full Fluorine Fl

nine Neon Ne

subjects Sodium Na

must Magnesium Mg

all Aluminium Al

silly Silicon Si

people Phosphorus P

stop Sulphur S

calling Chlorine Cl

a Argon Ar

pope Potassium K

christ Calcium Ca

Answer:

[tex]\boxed {\boxed {\sf 592,826,303.6 \ moles \ of \ Ca }}[/tex]

Explanation:

To convert from moles to particles, we must Avogadro's Number.

[tex]6.022*10^{23}[/tex]

This number tells us the number of particles (atoms, ions, molecules, etc.) in 1 mole of a substance. In this case, it is the particles of calcium in 1 mole of calcium.

[tex]6.022*10^{23} \ particles \ Ca / mole \ Ca[/tex]

We can use Avogadro's Number as a ratio or fraction.

[tex]\frac{6.022 *10^{23} \ particles \ Ca}{1 \ mol \ Ca}[/tex]

Multiply this by the given number of particles (3.57*10³²).

[tex]3.57*10^{32} \ particles \ Ca*\frac{6.022 *10^{23} \ particles \ Ca}{1 \ mol \ Ca}[/tex]

Flip the fraction so the particles of calcium will cancel out.

[tex]3.57*10^{32} \ particles \ Ca*\frac{1 \ mol \ Ca}{6.022 *10^{23} \ particles \ Ca}[/tex]

[tex]3.57*10^{32} *\frac{1 \ mol \ Ca}{6.022 *10^{23} }[/tex]

[tex]\frac{3.57*10^{32} \ mol \ Ca}{6.022 *10^{23} }[/tex]

[tex]592826303.6 \ mol \ Ca[/tex]

There are 592,826,303.6 moles of calcium in 3.57*10³² particles of calcium.

Answer:

B. the study of electricity in chemistry

Explanation:

Electrochemistry is the study of chemical processes that cause electrons to move. This movement of electrons is called electricity, which can be generated by movements of electrons from one element to another in a reaction known as an oxidation-reduction ("redox") reaction.

Answer:

B => Study of electricity in chemistry

Explanation:

Electrochemistry is the study of electricity associated with chemical oxidation-reduction reaction. It is divided into two distinct disciplines; electrolysis and Galvanic Process.

Electrolysis is a nonspontaneous process requiring an outside power source (typically a battery) to drive the chemical reactions. Applications include metal refining and generation of various gases (for collection) by chemical process.

Galvanic Process is a spontaneous chemical process generating electrical energy by taking advantage of the different properties of metals.  Applications include batteries for many devices such as flash lights (Leclanche dry cell), alkaline button batteries for hearing aids, automobile batteries (lead storage batteries), the H₂/O₂ Fuel Cell battery, etc.

In general,

Electrolysis => Uses electrical energy (batteries) to drive chemical reactions

or,

Galvanic Process => Using chemical reactions to generate electrical energy

Answer: D. Converting energy stored in chemical bonds into electricity.

Explanation:

100% on edg 2021 quiz.

Answer:

D. converting energy stored in chemical bonds to electricity

Explanation:

Edge 2020

Answer:

Explanation:

I'm guessing B)

I'm 86.7% sure that might be right.

Answer:

A theory is a broad, natural explanation for a wide range of phenomena.

Answer:

The energy source for all stars is nuclear fusion. Stars are made mostly of hydrogen and helium, which are packed so densely in a star that in the star's center the pressure is great enough to initiate nuclear fusion reactions. In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom.

The percentage composition of this compound : 40%Ca, 12%C and 48%O

Given

20.0 g of calcium,

6.0 g of carbon,

and 24.0 g of oxygen.

Required

The percentage composition

Solution

Total mass of compound :

=mass calcium + mass carbon + mass oxygen

=20 g + 6 g + 24 g

=50 g

Percentage composition :

[tex]\tt \dfrac{20}{50}\times 100\%=40\%[/tex]

[tex]\tt \dfrac{6}{50}\times 100\%=12\%[/tex]

[tex]\tt \dfrac{24}{50}\times 100\%=48\%[/tex]

Answer:

One or more number of species which have same number of atomic number but different mass number are called isotopes.

For example, [tex]^{1}_{1}H, ^{2}_{1}H, ^{3}_{1}H[/tex] are the isotopes of hydrogen.

So here, the atomic number of each of these isotopes is 1 and have different mass number, that is, 1, 2, 3.

Answer:

According to this picture w and y are metals and v z and x are non metals

Explanation:

Answer:

the 7 question answer is c the 24  question answer is b

Explanation:

Explanation: Number of moles of water = mass of water/ molar mass.  

Molar mass of H2O = (1*2) + 16 = 18.0  

 Now we only need to calculate the number of moles of water.  

The chemical reaction is as follows  

CH4 + 2O2 ---> CO2 + 2H2O  

From the eqn, the moles of H2O = 2*moles of CH4  

Molar mass of CH4 = 12 + 4 = 16. Number of moles of methane = mass/

molar mass.   No of moles = 6.4/16 = 0.4.  So the number of mole of water = 2* 0.4 = 0.8. We already calculate its molar mass earlier.  So mass of water = molar mass * number of moles = 18 * 0.8 = 14.4

Conversion factor : molar mass/molecular weight

Mass of H₂O produced = 72 g

Given

Reaction

2H2 + O2- 2H20

8 grams of H2

Required

Conversion factors

Solution

We can use the molar mass of the components and the mole ratio as conversion factors for the above equation

mol H₂ (MW = 2 g/mol) :

[tex]\tt mol=\dfrac{8}{2}=4~mol[/tex]

From the equation, mol ratio of H₂ : H₂O = 2 : 2, so mol H₂O = 4 mol

mass H₂O(MW = 18 g/mol) :

mass = mol x MW

mass = 4 x 18

mass = 72 g

Answer:

Vitamin A is important for normal vision, the immune system, and reproduction. Vitamin A also helps the heart, lungs, kidneys, and other organs work properly. There are two different types of vitamin A. The first type, preformed vitamin A, is found in meat, poultry, fish, and dairy products.

Answer:

Vitamin A helps form and maintain healthy teeth, skeletal and soft tissue, mucus membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye. Vitamin A promotes good eyesight, especially in low light. It also has a role in healthy pregnancy and breastfeeding.

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Answer:

87.5 mol of O2 is required to completely react with 35.0mol of C2H2

Explanation:

The equation is given as;

2C2H2 + 5O2 --> 4CO2  +  2H2O

The acetylene tank contains 35.0 mol C2H2, and the oxygen tank contains 84.0 mol O2.

From the balanced equatioon, the realtionship between the reactants is given as;

2 mol of C2H2 reacts with 5 mol of O2

How many mol of O2 would then react with C2H2?

2 mol C2H2 = 5 mol O2

35 mol C2H2 = x mol O2

Upon solving for x;

x = 35 * 5 / 2

x = 87.5 mol of O2

Answer:

87.5

Explanation:

Answer:

so what is the question?

where is the question?

thank you for free points. GBU.

Answer:

Independent: sizes of nails

Dependent: number of paper clips

Controlled: Battery, wire and type of nails

Explanation:

An independent variable is a variable which when changes does not the effect the results of the experiment. It does not depends upon the dependent variable.

A dependent variable is defined as a variable which is affected when the independent variable is changed by the researcher or the experimenter. It depends greatly upon the independent variable.

While a controlled variable is that variable whose value is not changed in an experiment. It contains all the constants.

In the context,

the independent variable are : sizes of nails

the dependent variables are : number of paper clips

the Controlled variables are: Battery, wire and type of nails

Answer: Nuclear

Explanation:

Nuclear energy generates power through fission, which involves splitting uranium atoms to produce energy. The heat released by fission is used to create steam that rotates turbine to generate electricity.

The energy produced by nuclear plants is carbon free but the products formed are radioactive and hence their transportation, storage, and disposal is a big problem. It can not be dumped like normal waste.

Answer:

D. Bromine (Br)

Explanation:

Based on its position on the periodic table Bromine is the only non-metal from the given choices of elements.

Moles of solute for both a and b are the same = 1 mol

Given

a 500 cm³ of solution, of concentration 2 mol/dm³

b 2 litres of solution, of concentration 0.5 mol/dm³

Required

moles of solute

Solution

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

Can be formulated :

[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]

a.

V = 500 cm³ = 0.5 L

M = 2 mol/L

n=moles = M x V

n = 2 mol/L x 0.5 L

n = 1 mol

b.  

V = 2 L

M = 0.5 mol/L

n=moles = M x V

n = 0.5 mol/L x 2 L

n = 1 mol

Answer:

Explanation:

Reactants                                    Product

H = 2                                          H=2

Cl=2                                             Cl=2      

Zn=1                                            Zn=1    

Total number of atoms  5            Total number of atoms  5