How do balanced chemical equations thon the
conservation of mass?
They show that the atoms in the products
may be different than the readarts as long
as the mass does not change,
They show that the atoms in the products are
the same as in the reactants, but the number
of atoms must change,
They show that the number of atoms of each
element is the same in the products and
reactants

Answer:

contact force

Explanation:

examples are frictional force etc

Answer:

Your mom

Explanation:

Julie I think that this is the most easiest  question someone has every asked in my whole entire life. I think you should really go to a lower class and will benefit you more. I wish you some what of some success!!!!

Mass of the object is 5.6196 * 10^4 g.

The term density has to do with the ratio of the mass to the volume of a substance. The density is an intrinsic property of a substance which could be used to identify a substance.

Mass of the substances = ?

Volume of the substance = 20. cm x 20.0 cm x 70.0 cm =28000 cm^3

Density of the substance = 2.007 g/cm3

Density = mass/volume

mass = density * volume

mass = 2.007 g/cm3  * 28000 cm^3

mass = 5.6196 * 10^4 g

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The balanced oxidation-reduction equation for the destruction of cyanate ion waste solution from gold-mining operations by treatment with hypochlorite ion in basic solution is:

OCN⁻(aq) + OCl⁻(aq) + 2OH⁻(aq) → CO₂⁻(aq) + N₂(g) + Cl⁻(aq) + H₂O(l)

In this reaction, the cyanate ion (OCN⁻) is oxidized to carbon dioxide (CO₂⁻) and nitrogen gas (N₂), while the hypochlorite ion (OCl⁻) is reduced to chloride ion (Cl⁻). The reaction takes place in basic solution, which provides the hydroxide ions (OH⁻) needed to neutralize the acidic H⁺ ions produced during the oxidation of the cyanate ion.

The reaction is exothermic, releasing heat energy as the products form. This reaction is an effective way to dispose of the cyanate ion waste generated by gold-mining operations, as it converts the hazardous waste into harmless gases and ions.

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Answer:

H₂SO₄  

Explanation:

A Brønsted acid is a proton donor.  It loses protons.

This equation may be easier to understand if we write it ionically.

\(\underbrace{\hbox{H$_{2}$SO$_{4}$}}_{\hbox{Br$\o{}$nsted acid}} + 2 \text{NH}_{3} \longrightarrow \, \underbrace{\hbox{SO$_{4}^{2-}$}}_{\hbox{Br$\o{}$nsted base}} + \text{2 NH}_{4}^{+}\)

We see that the H₂SO₄ has lost two protons to become SO₄²⁻, so it is a Brønsted acid.

Avogadro's number lets you calculate the number of anything in a mole:

0.250 mol Br2 X 6.02 X 10^23 molecules/mole = 1.50 X 10^23 molecules

One mole of Br₂ contains 6.02 × 10²³  bromine molecules  or formula units. Hence, 0.250  moles of Br₂  contains 1.5 × 10²³ Br₂  molecules.

One mole of a substance is its amount containing 6.02 × 10²³  atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Similarly one mole of every compound contains 6.02 × 10²³  molecules. The mass of one mole of compound is called its molar mass.

Br is 35th element in periodic table. One mole of bromine molecule  contains 6.02 × 10²³ Br₂ molecules . Hence number of molecules  of 0.250 moles is:

0.250  × 6.02 × 10²³  = 1.5 × 10²³ .

Hence, there will be 1.5 × 10²³  Br₂  atoms in 0.250  moles.

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The equation that can be said to show incomplete combustion is option A

Unburned carbon particles and carbon monoxide (CO), as well as water vapor and other byproducts, are examples of incomplete combustion products that are produced when a fuel does not completely react with the oxygen that is present during the combustion process.

Complete combustion occurs when a fuel combines with oxygen in the presence of enough heat to produce the primary byproducts of carbon dioxide, water, and heat.

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Explanation:

the answer is C marbles hope you find it helpful

Substituting the given values, we have (0.5 L) / (220 + 273.15 K) = V₂ / (313.15 K).Solving for V₂, we get V₂ = (0.5 L) * (313.15 K) / (220 + 273.15 K).

Calculating this expression, the volume of the balloon when fully cooled by your refrigerator would be approximately 0.38 liters when rounded to two decimal places.To convert Celsius to Kelvin, we need to add 273.15 to the Celsius temperature. Therefore, the temperature inside your refrigerator of 40 degrees Celsius is equivalent to 313.15 Kelvin.Now, let's consider the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.Since the number of moles and pressure remain constant, we can write  the equation as V₁/T₁ = V₂/T₂, where V₁ is the initial volume of the balloon, T₁ is the initial temperature, V₂ is the final volume, and T₂ is the final temperature.

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Answer:

2.43%

Explanation:

If want to determine the percent error, you need to use the following equation:

                              | measured value - actual value |
Percent Error  =  ---------------------------------------------------  x  100%
                                               actual value

The actual value is the standard definition value. The measured value is the value found through experimentation. It is important not to forget the take the absolute value of the numerator.

In this case, the actual value is 947 mL and the measured value is 924 mL.

                            | 924 mL - 947 mL |
Percent Error  =  -------------------------------  x  100%
                                      947 mL

                             | -23 mL |
Percent Error  =  ------------------  x  100%
                                947 mL

                                23 mL
Percent Error  =  ------------------  x  100%
                                947 mL

Percent Error  =  2.43%

The matter is substances is present everywhere, including the mixtures, elements, and compounds. Mixtures are matter that can be separated by physical methods.

Mixtures are defined as substance and matter that is made of two or more components (substances) that are not bonded or linked chemically and rather shows physical interaction.

A mixture for example of sand and water can be physically separated by filtration, seawater by evaporation, etc. Whereas, a compound involves chemical interactions that are not separated by physical means.

Therefore, a mixture can be separated by physical process.

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The boiling point of hydrogen at atmospheric pressure is -252. 8°C.

Atmospheric pressure is defined as the pressure which is exerted by the atmosphere to us.

Temperature is term which is defined as the measure of degree of coldness or hotness which is expressed in terms of different type of scales, including Celsius and Fahrenheit.

Boiling point is defined as the bulk phenomenon.

It is the temperature where the pressure of liquid is equal to the pressure of our surrounding or atmospheric pressure.

Or simply it is defined as the temperature at which liquid start boiling.

As we know that,

The atmospheric pressure is 1.0 x 10^5 Pa.

Then the temperature at which hydrogen liquid start boiling is -252. 8°C. Therefore it need to store in the cold or low temperature.

Thus, we concluded that the boiling point of hydrogen at atmospheric pressure is -252. 8°C.

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Answer: The molecular formula will be \(C_6H_6O_6\)

Explanation:

Mass of \(CO_2\) = 17.95 g

Mass of \(H_2O\)= 4.87 g

Molar mass of carbon dioxide = 44 g/mol

Molar mass of water = 18 g/mol

For calculating the mass of carbon:

In 44g of carbon dioxide, 12 g of carbon is contained.

So, in 17.95 g of carbon dioxide, =\(\frac{12}{44}\times 17.95=4.89g\) of carbon will be contained.

For calculating the mass of hydrogen:

In 18g of water, 2 g of hydrogen is contained.

So, in 4.87 g of water, =\(\frac{2}{18}\times 4.87=0.541g\) of hydrogen will be contained.

Mass of oxygen in the compound = (12.00) - (4.89+0.541) = 6.57 g

Mass of C = 4.89 g

Mass of H =  0.541 g

Mass of O = 6.57 g

Step 1 : convert given masses into moles.

Moles of C =\( \frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{4.89g}{12g/mole}=0.407moles\)

Moles of H=\(\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.541g}{1g/mole}=0.541moles\)

Moles of O=\(\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{6.57g}{16g/mole}=0.410moles\)

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C =\(\frac{0.407}{0.407}=1\)

For H =\(\frac{0.541}{0.407}=1\)

For O = \(\frac{0.410}{0.407}=1\)

The ratio of C : H : O = 1: 1  : 1

Hence the empirical formula is \(CHO\).

Hence the empirical formula is \(CHO\)

The empirical weight of \(CHO\) = 1(12)+1(1)+1(16)= 29 g.

If 0.25 moles has mass of 44.0 g

Thus 1 mole has mass of = \(\frac{44.0}{0.25}\times 1=176g\)

Thus molecular mass is 176 g

Now we have to calculate the molecular formula.

\(n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{176g}{29g}=6\)

The molecular formula will be=\(6\times CHO=C_6H_6O_6\)

Answer:

D

Explanation:

Because jwbahaggagqhhwjwjja

answer: c- new knowledge showed that the exact location of electrons can not be known.

Explanation: i just did it ;)

The synthesis of the 3,4-dimethylhexane from 1-bromobutane occurs by the Wurtz reaction as shown.

We know that synthesis is one of the key components of organic chemistry. In the process of the synthesis of compounds, we are going to have the combination of two or more reactants so as to obtain the products that we are looking for.

In this case, we are trying to carry out the synthesis of an alkane compound. The alkane that we want to produce in this case is the compound that is known as 1-bromobutane and we are going to use  3,4-dimethylhexane to carry out the reaction.

This can be done by the use of the Wurtz reaction that is going to involves the reaction of sodium metal with an alkyl halide in dry conditions.

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Answer:

Element A = Oxygen

Element H =

Element B = Aluminum

Element J = Magnesium

Element C = Selenium

Element L = Carbon

Element D = Sodium

Element Q = Francium

Element F = Antimony

Element R = Calcium

Element G = Chlorine

Element S = Tellurium

Explanation:

Element A  is Oxygen because: oxygen 6 valence electrons ; is a gas at room temperature ; and is transported in blood to cells.

Element H  is Neon because: Neon is a noble gas ;   qppears as red light when charged with  electricity (Neon light signs)  and it has the second highest Ionization energy of the elements

Element B  is Aluminum because: Aluminum is a metal and its ion has charge of +3. It is also located on the borders of the Metalloid staircase .

Element J  is Magnesium because its ion has charge of 2+ and is  isoelectronic with Neon  because it loses two electrons to now have 10 electrons.

Element C  is Selenium because its ion that has a charge of -2  is formed by gaining two electrons in order to have 36 electrons which is isoelectronic with Kr ypton

Element L  is Carbon because carbon has the smallest atomic radius of any member in the Carbon family  because it is the first member of the family and atomic radius increases on going down the group.

Element D  is Sodium because its ion has charge of +1  and it has 2 inner core levels , the 1 and 2 energy levels.

Element Q  is Francium because it has the largest radius and lowest ionization  energy of any element

Element F  is Antimony. It is a member of Nitrogen family  and has the second highest ionization energy level in family .

Element R  is calcium because its on has charge of +2  which is isoelectronic with Argon . Calcium also has atomic radius is larger than Ar gon.

Element G  is Chlorine. It has the second to the smallest radius of elements in the 3rd period  as the second to the last element in the period because atomic radius decreases across a period from left to right.

Element S  is Tellurium. It has atomic mass larger than Iodine just to the right  of it and is found in the 5th period

The names of the elements as described are as follows;

For Element A:

Element A is oxygen as oxygen has 6 valence electrons ; is a gas at room temperature ; and is transported in blood to cells.

For Element H:

For Element B

For Element J

For Element C:

For Element L:

For Element D:

For Element Q:

For Element F:

For Element R:

For Element G:

Chlorine is element G It has the second to the smallest radius of elements in the 3rd period (only larger than Argon) because atomic radius decreases across a period

For Element S:

Tellurium is element S as it has atomic mass larger than Iodine just to the right of it and is found in the 5th period.

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The ppm concentration of the sodium chloride solution, given that 7.0×10⁻³ g is dissolved with a volume of 2 L is 60 ppm

To obatin the concentration in ppm, we'll begin by obtaining the mole of the sodium chloride in the solution. This can be obtained as follow:

Mole = mass / molar mass

Mole of sodium chloride = 7.0×10⁻³ / 58.5

Mole of sodium chloride = 0.00012 mole

Finally, we shall determine the concentration in ppm. This can be obtained as follow:

Concentration (in ppm) = (mole of solute / volume) × 10⁶

Concentration (in ppm) = (0.00012 / 2) × 10⁶

Concentration (in ppm) = 60 ppm

Thus, we can conclude that the ppm concentration is 60 ppm

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Answer:

The starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.

The number of atoms or molecules in the compounds are as follows;

a) 6.02 * 10^24

b) 3.7 * 10^2

c) 3.7 * 10^2

d) 2.27 * 10^23

e) 4.5 * 10^23

We know that atoms are the smallest parts of a substances that can take part in a chemical reaction. We also know that one mole of a substance must contain the Avogadro's number of atoms in the molecule.

Let us now find the number of atoms in each case;

a) 20 g/2 g/mol * 6.02 * 10^23

= 6.02 * 10^24

b) 54.30 g/88 g/mol  * 6.02 * 10^23

= 3.7 * 10^2

c)  84.6 g/106 g/mol * 6.02 * 10^23

= 4.80 * 10^23

d) 9.432 * 10^3 g/25 g/mol  * 6.02 * 10^23

= 2.27 * 10^23

e) 0.75 moles  * 6.02 * 10^23

= 4.5 * 10^23

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Answer:

The solubility of alkaline earth metal hydroxides in water increases down the group because the size of the metal cation increases as you move down the group. This increase in size results in a decrease in the cation's charge density, which makes it less able to attract and hold onto hydroxide ions. As a result, the hydroxides become more soluble in water as you move down the group. Additionally, the lattice energies of the hydroxides decrease down the group, making it easier to break apart the crystal lattice structure and dissolve the hydroxides in water.

The false statement about the gas expansion process is "∆S(system)=0".

When the gas expands into the vacuum, it undergoes an irreversible process. The gas molecules move from a region of high concentration to a region of low concentration, and as a result, there is an increase in entropy (∆S) of the gas.

According to the Second Law of Thermodynamics, the entropy of an isolated system will always increase for an irreversible process. Therefore, the entropy of the system, in this case, the gas, increases as it expands into the vacuum. The false statement about the gas expansion process is "∆S(system)=0". The other statements are true for this process. Since there is no temperature difference between the gas and the surroundings, the change in temperature is zero (∆T=0). The change in internal energy (∆E) is also zero since the gas is expanding against no external pressure. Finally, since there is no heat transfer between the system and the surroundings, the work done (∆PE + ∆KE) is equal to the heat transfer (w = q).

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The table, which lists information about the measured acid dissociation constants of three unknown weak acids is 3,2 and 1 respectively.

Acid               \(K_{a}\)                    \(pK_{a}\)               Relative strength

A                1.6×10⁻¹¹                10.8                          3

B                 1.64×10⁻²              1.78                          2

C                 2.5×10⁻²                1.6                            1

Weak acids are acids that do not completely dissociate in solution. In other words, a weak acid is an acid that is not a strong acid. The strength of weak acids depends on the strength with which they dissociate. The more it dissociates, the stronger the acid. HCl is a strong acid because it dissociates almost completely.

KCl is naturally a salt with a strong basic cation and a strong acidic anion neither of which affect pH paper and has a standard value of pH 7.0 being neutral. shape. Vinegar is a combination of acetic acid and water made by a two-step fermentation process.

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A preliminary design for chemical X is displayed below. X will have a liquid phase at a temperature of 25 °C as well as 1 atom.

In comparison to a solid phase, individual single-molecule stresses are greater in some kind of a liquid phase. A liquids will take on the shape of its container's free surface when it is subject to a gravitational influence. In a weightless environment, a substance produces a ball from the interior of an outer surface. The volume of something like a liquid is consistent with the rest of gravity.

The procedure of dissolving involves transitioning from either a frozen to a liquid state. freezing is the process by which a liquid turns into a solid. Evaporation is the transformation of a substance into a gaseous.

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5.50M NaOH must be added to 680.0 mL of a buffer, The amount of NaOH  is mathematically given as

V=2.107mL

Generally, the equation for Chemical Reaction is mathematically given as

CH3COOH+OH^{-} ⇄ CHCOO^{-} + H2O

Therefore

pka=-log(1.8*10{-5})

pKa=5-0.25527

pKa=4.3447

Hence

\(pH=pKa+log\frac{CH3COO}{CH3COOH}\\\\0.75=4.7447+log\frac{0.01564+x}{0.01428-x}\)

x=0.0115898

Volume of NaOH

V=0.0021072L

V=2.107mL

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Answer:

7/16 N

Explanation:

Since it is neutral we know that it also contains 7 protons, which is shown by the atomic number. 7 matches with nitrogen.

There are 9 neutrons so add 9+7=16

7/16 N (not sure how to show it on brainly but it would look something like this)

The complete chemical symbol for the neutral element that contains 7 electrons and 9 neutrons is ¹⁶₇N.

It is an abbreviation used in chemistry for chemical elements and chemical compounds.Symbols for chemical elements consist of one or two letters from the name of most of the elements and in some cases they are derived from the Latin names with the first letter being capitalized.

For example:chemical symbol of oxygen is O.While that of gold is Au because the Latin name of gold is Aurum.

Chemical symbol of an element represents one atom of an element.It refers to one mole of atoms of that element.Therefore, the symbol of an element represents 6.022×10²³ atoms. It also represents a definite mass of the elements which is equal to their gram atomic mass.

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Mass of 1.5 mole of electron is 0.8229 mg

mass of electron = 9.11 * 10^-31 kg

mass of 1 mole of any substance ( Avagadro number ) = 6.022 * 10^23 /mol

1.5 moles of electron  = 1.5 * 6.022 * 10^23 = 9.033 * 10^23 /mol

mass of 1.5 mole of electron = 9.033 * 10^23 * 9.11 * 10^-31

mass of 1.5 mole of electron = 8.229 * 10^-7 kg

mass of 1.5 mole of electron = 8.229 * 10^-4 g

mass of 1.5 mole of electron = 0.8229 mg

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Answer:

c)

Explanation:

acidic oxides are formed

metal oxides and basic oxides are basically the same.

As the disturbance gets to the land the warm ocean waters are no longer around thus the hurricane would die off rapidly

The hurricane tends to occur when there is a rise of the warm air over the ocean. It should be noted that in the event of the hurricane there would be a sudden rising of the sea and this is going to rise so high that the violent waves would now begin to invade the land and cause a lot of destruction on its path as it is moving out from the ocean where the disturbance started.

Hence we can see that the origin of the hurricane is from some sort of a convection current that is taking place in the ocean and the hurricane must also be sustained by the existence of this convection current as the disturbance is moving away from the sea.

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