Chemical reactions occur at the same rate no matter what the size of the reactant particles.

True or false?​

Answer:

      [tex]\dfrac{2.31}{0.790}=2.92[/tex]

Explanation:

When you divide two measures, the rule for the number of significant figures of the quotient is to keep the number of significant figures of the measure with least significant figures.

Then, the asnwer must have three significant figures:

            [tex]\dfrac{2.31}{0.790}\approx 2.92405\approx2.92[/tex]

Since the figure after 2.92 is less than five, you just drop it.

Final answer:

To solve 2.31 ÷ 0.790, divide the numbers and round the result to three significant figures, the least number present in the given values, giving the final answer as 2.92.

Explanation:

To solve the division problem 2.31 ÷ 0.790 with the proper number of significant figures, we must consider the number of significant figures in each of the original numbers. The number 2.31 has three significant figures, and 0.790 has three significant figures as well. When dividing, the number of significant figures in the result should be the same as the number with the least significant figures in the problem.

To get the answer, we divide 2.31 by 0.790:

Therefore, the answer to the problem expressed to the correct number of significant figures and with proper units (if they were provided in the original problem), would be 2.92.

Some policies they might do is to put limits on water usage, like making sure that people don't use too much water in baths and when they are tending to their gardens.

Reduce the use of water can conserve water levels.

In conclusion, reduce the use of water can conserve water levels.

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The electrical current in a circuit is measured in amperes (amps). According to Ohm's Law, current (I) equals voltage (V) divided by resistance (R). Understanding these units helps grasp the flow of electricity in circuits.

The electrical current in a circuit is measured in amperes (often abbreviated as amps and symbolized by 'A'). According to Ohm's Law, the electric current (I) can be calculated by dividing the voltage (V) by the resistance (R). These relationships and units help in understanding the flow of electric current in circuits:

Answer:

Explanation:

Atomic mass is the sum of number of protons and neutrons while atomic number is the number of protons or electrons.

A neutral atom has equal number of protons and electrons that's why atomic number could be either number of protons or electrons.

Element            Symbol      Atomic#      Mass#     Protons       Neutrons    

Mercury                Hg                  80            200          80                120

Solution:

number of neutrons = mass number - atomic number

number of neutrons = 200 - 80

number of neutrons = 120

Element            Symbol      Atomic#      Mass#     Protons       Neutrons    

Tungsten                 W              74                 184             74            110

Solution:

number of neutrons = mass number - atomic number

number of neutrons = 184 - 74

number of neutrons = 110

Element            Symbol      Atomic#      Mass#     Protons       Neutrons    

Sodium                 Na              11                 23             11                  12

Solution:

number of neutrons = mass number - atomic number

number of neutrons = 23 - 11

number of neutrons = 12

Element            Symbol      Atomic#      Mass#     Protons       Neutrons    

Antimony               Sb              51                122             51                  71

Solution:

number of neutrons = mass number - atomic number

number of neutrons = 122 - 51

number of neutrons = 71

Element            Symbol      Atomic#      Mass#     Protons       Neutrons    

Silver                   Ag               47                108             47                61

Solution:

number of neutrons = mass number - atomic number

number of neutrons = 108 - 47

number of neutrons = 61

Answer:

Shorter showers

Explanation:

A 5 to 10 minute shower will only take about 10 or 20 gallons of water. Or you could take a bath and not fill the bathtub up very much.

It's completely up to you which one you chose to use. Many people take 30 to 60 minute showers. Based on that math, that could take up to 120 gallons of water.  

That shows that simply shortening your shower time, you will save gallons of water!

~CaityConcerto

Answer:

Fe=625.026g

Molar mass of Al2O3=102g

Molar mass of Fe=168g

102g of Al2O3-168g of Fe

379.48g of Al2O3-xg of Fe

Cross multiply

102x = 168×379.49

102x=63752.64

X= 625.026g

Therefore,the mass of Fe is 625.027g

Explanation:

Answer:

(A)-Continuous

Continuous type of spectrum does show the illustration A. Therefore, option A is correct.

A continuous spectrum contains all light wavelengths within a specific range. Hot, dense light sources, such as stars, emit a nearly continuous spectrum of light that travels in all directions and interacts with other materials in space.

Continuous spectra also known as thermal or blackbody spectra are produced by dense gases or solid objects that emit heat. They emit radiation at a wide range of wavelengths, giving the spectra a smooth and continuous appearance.

The visible "electromagnetic spectrum" is a continuous spread of all spectral colors organized by wavelength.

Thus, option A is correct.

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Answer:

Explanation:

Wavelength and frequency are related by the velocity equation of waves.

  Velocity  = f x ∧

where f is the frequency

           ∧ is the wavelength

Frequency of a wave is the amount of that wave that passes through a point at a particular time.

Wavelength of a wave is the distance between two successive crests and trough.

Velocity of a wave is the speed of a wave

Answer:

2H2 + O2 —> 2H2O

Explanation:

The equation for the reaction between H2 and O2 to produce liquid water is illustrated below:

H2 + O2 —> H2O

Next, we need to balance the equation. This can be achieved by doing the following:

There are 2 atoms of oxygen on the left side and 1 atom on the right side. It can be balanced by putting 2 in front of H2O as shown below:

H2 + O2 —> 2H2O

There are a total of 4 atoms of Hydrogen on the right side and 2 atoms on the left. It can be balanced by putting 2 in front of H2 as shown below:

2H2 + O2 —> 2H2O

Now we can see that the equation is balanced as we have the same number of atoms of Hydrogen and oxygen on both sides of the equation

The balanced chemical equation for the reaction of hydrogen gas with oxygen to form liquid water is: 2H2 + O2 = 2H2O. This equation respects the law of conservation of mass.

The reaction of hydrogen gas with oxygen to form liquid water is a chemical reaction that can be written as a balanced chemical equation. In this reaction, two molecules of hydrogen gas (H2) react with one molecule of oxygen gas (O2) to form two molecules of liquid water (H2O). So, the balanced chemical equation for this reaction is:

2H2 + O2 = 2H2O

This equation shows that for every two molecules of hydrogen gas and one molecule of oxygen gas, two molecules of water are produced. It is balanced because it obeys the law of conservation of mass, which states that the total mass of the reactants equals the total mass of the products in a chemical reaction.

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Answer:

96 grams are required.

Explanation:

Given data:

Mass of K₂SO₄ required = ?

Mass of K₂SO₄ from = 1200 g of 8%

Solution:

Formula:

m/m% = mass required / mass given

Now we will put the values:

8%= x / 1200 g

8/100 = x / 1200 g

0.08 = x / 1200 g

0.08 × 1200 g= x

x = 96 g

So 96 gram of 1200 g is required.

Answer:

(13) billions

Big bang

expanding

quickest

nebula

hydrogen

giants

less,sun

fuel

helium

energy

supernova

white

smaller

neutron

planets/homes

Answer:

       [tex]\large\boxed{\large\boxed{7.9\times 10^9g}}[/tex]

Explanation:

The information of the content of  the element strontium in seawater is incomplete. The complete information is:

1. First, convert the given volume of seawater given to kilograms

[tex]9.84\times 10^{8} m^3\times \dfrac{1,000dm^3}{m^3}\times \dfrac{1,000cm^3}{dm^3}\times 1.0\dfrac{g}{cm^3}\times\dfrac{1kg}{1,000g}=9.84\times 10^{11}kg[/tex]

2. Second, multiply the given concentration of the element strontium by the amount of seawater in kilograms

     [tex]8.0\times 10^-1cg/kg\times 9.84\times 10^{11}kg\times 1g/100cg=7.872\times 10^9g[/tex]

3. Finally, round to two significant figures:

     [tex]7.9\times 10^9g[/tex]

Answer:

A charge of -3

Explanation:

If you look on a periodic table you will find that phosphorus is 3 elements away from the nearest noble gas argon. This means that phosphorus would prefer a charge of -3!

Answer:typically it will be -3

Explanation:

It prefers to take up 3 electrons and thereby become phosphide with a -3 charge. since it is a nonmetal it will take up electrons making it negative as an ion. In order to fill up its last shell, to become stable, to form an octet it will need 3 added electrons which will give it that -3 charge. An atom of phophorus will be neutral, An ion of phsphorus will have a -3 charge.

1. carbon dioxide is a gas at low temperatures at mars because in the oxidizing environment organic compounds are oxidized to form carbon dioxide.

2. The 1 electron in outermost shell of Na is shared with 7 electrons of outermost shell of chlorine giving neutral charge on compound.

3. Electrostatic force of attraction is between the metal and non-metal.

4. When metal and non metal exchange electrons to form a neutral or no charge compound it is said to have form ionic bonds.

Explanation:

1. Temperature at Mars is very low -80 Fahrenheit  (-60 degrees) because water is not present in the planet. Carbon dioxide is abundant in Mars. The atmosphere is oxidizing at Mars which oxidizes the organic compounds and forms carbon dioxide.

2. NaCl combines by sharing of electrons forming ionic bonding. Different atoms of the different element share electrons to form ionic bonds. Such bond is formed when electrons is transferred between the atoms. In the NaCl, Na has 1 electron (electropositive) in its outer shell and chlorine has 7 electrons (electronegative). Both share the electrons getting their octet complete and a neutral charge on the compound formed.

3. Electrostatic force of attraction is between the metal and non-metal when bond is formed. The ionic bonds is formed between metal and non metals when electron exchange takes place. The electrostatic force is the attraction between two opposite charges on the ion.

4. When a metal and non metal exchange electrons in which metal is electropositive and non metal is electronegative the bonds form is called ionic bond. The electron is transferred from metal to non metal and thus giving neutral charge on the compound i.e. the outer shell has its octet complete.

Answer:

d

Explanation:

The light is an electromagnetic radiation which can be perceived by our human eye. The beam of light travel fastest in air. The correct option is D.

The light is defined as an electromagnetic radiation which help us to see the objects. It is composed of small packets of energy called photons. The light always moves in a straight line. Light travels at a faster rate than sound waves.

The speed of light is found to be 3 × 10⁸ m/s. Light does not require a physical medium for the propagation. It is known as a transverse wave which travels without the use of medium.

According to Einstein's theory of relativity, nothing can travel faster than light. When light is incident on any surface, the particles of light collide with the surface and thereby reflection and refractions occur.

Thus the correct option is D.

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20.06 g of Hg  and 1.6 g of O₂

Explanation:

To Find:

Number of Mercury and oxygen that can be obtained from 21.7 g of HgO

First we have to write the balanced equation for the decomposition reaction of Mercury(II) oxide as,

2 HgO (s) → 2Hg(l) + O₂ (g)

21.7 g of HgO  = [tex]\frac{21.7 g}{216.59 g / mol}[/tex]  

                         = 0.1 mol of HgO.

As per the above equation, we can find the mole ratio between HgO and Hg is 1: 1 and that of HgO and oxygen is 2:1 .

So amount of Hg produced = 0.1 mol × 200.59 g / mol ( molar mass of Hg)

                                                 = 20.06 g of Hg

Amount of oxygen produced = 0.05  mol × 32 g/ mol = 1.6 g of O₂

Thus it is clear that 20.06 g of Hg  and 1.6 g of O₂  is obtained from 21.7 g of HgO

Final answer:

From 21.7g of mercury (II) oxide, approximately 20.059 g of mercury and 1.6 g of oxygen can be produced through the decomposition reaction. This calculation uses the stoichiometry of the reaction and the molar masses of the substances involved.

Explanation:

To determine how much mercury and oxygen could be obtained from 21.7g of mercury (II) oxide, we need to consider the decomposition reaction of mercury (II) oxide under standard state conditions:

2HgO(s, red) → 2Hg(l) + O2(g)

By using the molar mass of mercury (II) oxide (216.59 g/mol), we can convert the mass of mercury (II) oxide to moles:

21.7 g HgO × (1 mol HgO / 216.59 g HgO) = 0.1 mol HgO

Following the stoichiometry of the reaction, 0.1 moles of HgO will produce 0.1 moles of Hg and 0.05 moles of O2, since 2 moles of HgO decompose to produce 1 mole of O2. We can then calculate the mass of mercury and oxygen produced:

0.1 mol Hg x (200.59 g Hg/mol) = 20.059 g of Hg

0.05 mol O2 x (32 g O2/mol) = 1.6 g of O2

Therefore, 21.7g of mercury (II) oxide will produce approximately 20.059 g of mercury and 1.6 g of oxygen.

Answer:

C. It lists only the substances that are changed.

Explanation:

Balanced Chemical equation:

HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)

Ionic equation:

H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)

Net ionic equation:

H⁺(aq) + OH⁻(aq) → H₂O(l)  

The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.  This'e why it is written in net ionic equation.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

Final answer:

A net ionic equation lists only the substances that change during a reaction, excluding spectator ions that do not participate in the chemical process. Therefore, the correct answer is C: It lists only the substances that are changed.

Explanation:

A net ionic equation is a chemical equation that shows only the species that actually participate in the reaction. These species are the ions that undergo a chemical or physical change during the reaction, which is different from the spectator ions that do not participate in the reaction. Spectator ions are present in the solution before and after the chemical reaction and do not undergo any change, so they are not included in the net ionic equation.

Correctly answering the student's question, a net ionic equation provides information about option C: It lists only the substances that are changed. This type of equation demonstrates the actual chemical change between the ionic compounds, excluding all the spectator ions that remain unchanged during the reaction process.

Answer:

hope it's helpful to you .

your 9th question is wrong but I did it correctly

it's not BaS2 it's BaS

The student's inquiry involved balancing a series of chemical equations, a fundamental concept in stoichiometry. Each balanced equation ensures that there is the same number of each element's atoms on the reactant side as on the product side, in accordance with the law of conservation of matter.

The questions you've posed involve stoichiometry, a field in chemistry that quantifies the relationships of different substances in a chemical reaction. Balancing chemical equations involves ensuring the conservation of atoms (each element in reactants should be equal to the count of the same element in products). Here are the balanced equations:

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The balanced version of the chemical equation V2O5 (s) + HCl (aq) --> VOCl3 (s) + H2O (l) is: V2O5 (s) + 6 HCl (aq) --> 2 VOCl3 (s) + 3 H2O (l). This balance is achieved by ensuring an equal number of each type of atom on both sides of the equation.

To balance the given chemical equation, we need to ensure there are equal numbers of each type of atom on both sides of the equation. Let's start with vanadium (V) and chlorine (Cl) atoms, as they are only in one reactant and one product:

Now we have two vanadium atoms on both sides, but the number of chlorine atoms is not balanced yet. We'll increase the number of hydrochloric acid (HCl) molecules:

Last, let's balance the number of hydrogen (H) and oxygen (O) atoms. We'll also add some water molecules:

So the balanced equation is: V2O5 (s) + 6 HCl (aq) --> 2 VOCl3 (s) + 3 H2O (l).

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The question is about balancing a chemical equation. The balanced equation for V2O5 (s) + HCl (aq) ---> VOCl3 (s) + H2O (l) is V2O5 (s) + 6HCl (aq) ---> 2VOCl3 (s) + 3H2O (l)

The subject of this question relates to the balancing of a chemical equation. The chemical equation provided: V2O5 (s) + HCl (aq) ---> VOCl3 (s) + H2O (l) needs to be balanced, that is, the number of atoms of each element on the reactant (left) side of the equation have to equal the number of atoms of each element on the product (right) side of the equation. In this case, the balanced chemical equation would be V2O5 (s) + 6HCl (aq) ---> 2VOCl3 (s) + 3H2O (l)

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287.39 grams of Al2(SO4)3 is formed if 250g H2SO4 completely reacted with aluminum.

Explanation:

Balanced chemical equation:

2Al + 3H2SO4->Al2(SO4)3+H2

Data given:

atomic mass of Al2(SO4)3 = 342.14 gram/mole

mass of H2SO4 given = 250 gram

atomic mass of one mole of H2SO4 = 98.079 grams/mole

number of moles = [tex]\frac{mass}{atomic mass of one mole}[/tex]

number of moles = [tex]\frac{250}{98.079}[/tex]

number of moles = 2.54 moles

from the equation it can be seen as

3 moles of H2SO4 will react to give 1 mole Al2(SO4)3

2.54 moles of H2SO4 will react to give x moles of Al2(SO4)3.

[tex]\frac{1}{3}[/tex]= [tex]\frac{x}{2.54}[/tex]

x = 0.84 moles of Al2(SO4)3 is formed.

to calculate mass of the Al2(SO4)3 = Number of moles x atomic weight of one mole

= 0.84  x  342.14

= 287.39 grams of Al2(SO4)3 is formed.

Answer:

steam at 100°C

Explanation:

Grandpoint approved

The average kinetic energy of water molecules is greatest in steam at 100°C.

Water is a polar solvent that has potential energy on its own which can be converted to kinetic energy once the water is in motion.

The kinetic energy is that energy that a moving body possesses.The faster a molecule moves, the more kinetic energy it has, and the higher the measured temperature.

That being said, when the temperature of water is increased, there would be increased molecular motion leading to a higher kinetic energy.

Therefore, the average kinetic energy of water molecules is greatest in steam at 100°C.

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The mixture is a solution

Its a solution because two substances mixed

Answer:

Yes, they are isotopes.

Explanation:

Isotopes are atoms with the same atomic number Z and a different mass number (A). That is, they differ in the number of neutrons (eg carbon 12, has 6 protons, 6 electrons, and 6 neutrons, carbon 13, 7 neutrons, and carbon 14 8 neutrons).

Answer:

The correct answer is B)About 5 percent

Explanation:

The approximate total size of the human nuclear genome is 3,200,000,000 base pairs. 1 to 1, 4% encode proteins, 24% are non-coding regions and the rest correspond to intergenic regions.

Of the total base sequence in human DNA, only about 5 percent code for proteins (Option B).

In conclusion, of the total base sequence in human DNA, only about 5 percent code for proteins (Option B).

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Answer:

that's because....

group 1 (e.g Na, K) those tend to lose one electron to gain noble gas electron configuration.

they can achieve that by just losing one electron from their outer shell.

as you go down the group 1, element gets bigger in size, which means there is more space between nucleus (which is in center of atom) and electron of outer shell. the more far away they are the less attraction force between them.

so its easier for potassuim to lose one electron than for lithuim.

so that means potassium will easily give up 1 electron to react with non metal or other element therefore it is more reactive than lithuim

but in case of non metal, the opposite happens but simple to understand.

as you go down the group 7 (halogen- Cl, Br, I) element will get bigger therefore force between nucleus and outer electron is getting smaller. they have to gain 1 electron in order to fill the outer shell (to gain noble gas electron configuration.)

as florine is more smaller in size than clorine it is more reactive because florine has more tendency to pull extra electron from metal or other element towards its side. so it easily gain 1 electron to react.