PRACTICE Problems
Predict whether the following single-replacement reactions will occur. If a reaction occurs,
write a balanced equation for the reaction.
21. K(s) + ZnCl₂(aq) →→→
Single-replacement reactions will occur if the reaction below occurs
K(s) + ZnCl₂(aq) →→→ KCl₂ + Zn.
What is Single-replacement reaction?This is also referred to as single displacement reaction and it is referred to as a reaction in which one element is substituted for another element in a chemical reaction.
Single-replacement reactions will occur in the reaction below because it follows and obeys this condition which is:
A + BX ⇒ B + AX
K(s) + ZnCl₂(aq) →→→ KCl₂ + Zn.
Here we can deduce that zinc was substituted which is therefore the reason why it was chosen as the correct choice in this scenario.
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A gold atom i a phere with a diameter with 272 pm and a ma with 3. 27x 10^-13 ng. Calculate the denity of one gold atom in g/cm ^3
The answer is 3.88 g/cm³ for density.
How can you figure out a sphere's density?When you know the radius, you may use the formula volume = (4/3) π r3 to calculate the sphere's volume. Then, using the formula mass = volume density, you can calculate the mass by multiplying the volume by the density: mass = volume density. The formula mass = (4/3) π r3 density can also be used.
Given,
Radius of gold sphere is equal to 272 pm or 272 × 10 ⁻¹² m.
= 2.72 10 10 m 10²cm/m.
The diameter of an atom of gold is 2.72 × 10⁻⁸ cm,
volume of sphere = πr³
V(Au) = 4/3 · (2.72·10⁻⁸ cm)³ · 3.14.
The volume of one atom of gold is 8.43·10⁻²³ cm³
Mass of atom of sphere is equal to 3.27·10⁻¹³ ng · 10⁻⁹ g/ng
Gold atom mass is 3.27·10⁻²² g grams,
density of sphere = mass of gold atom ÷ Volume of gold atom
density of sphere = 3.27·10⁻²² g ÷ 8.43·10⁻²³ cm³
One gold atom has a density of 3.88 g/cm³
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What is the kinetic energy a car with a mass of 1500kg running with a velocity of 20m s to the east?.
The kinetic energy of a car with a mass of 1500 kg running at a velocity of 20 m/s to the east is 60000J (Joules).
The kinetic energy of an object is the energy it possesses due to its motion. It is calculated by using the formula KE = 0.5 * m * v^2, where m is the mass of the object in kilograms and v is its velocity in meters per second.
So, for a car with a mass of 1500 kg running with a velocity of 20 m/s to the east, the kinetic energy can be calculated as follows:
KE = 1/2 * 1500 kg * (20 m/s)^2
KE = 60000 J
By plugging these values into the formula, we can find that the car's kinetic energy is 60000 J (Joules). It's worth noting that kinetic energy is a scalar quantity and has no direction, so the velocity's direction (east) does not affect the calculation.
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when hydrogen bonds form between water molecules, water____
When hydrogen bonds develop between the molecules, the boiling point of water rises. Hydrogen bonds are created when the electronegative oxygen atoms of two different water molecules combine.
Has a hydrogen atom that it can attach to in a separate water molecule. The molecules are hence strongly attracted to one another. In order to make a hydrogen bond, two atoms from either the same or a distinct molecule are required. Hydrogen bonds can form in two different ways: Between-molecule H-bonding molecules form hydrogen bonds. Hydrogen bonding is possible when the hydrogen atom in a molecule is attached to a strongly electronegative atom. One hydrogen atom in water is wedged between two oxygen atoms, creating a solid bond with the following water molecule.
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If the molecular mass of the salt is 136 g/mol, how many moles of anhydrate are there?
if the mass of the sample is 272 grams, the number of moles of anhydrate present would be:
moles = 2
What are moles?Generally, To determine the number of moles of anhydrate present, you would need to know the mass of the sample. If you have that information, you can use the formula:
moles = mass / molar mass
Where
mass is the mass of the sample in grams and
molar mass is the molar mass of the salt (in this case, 136 g/mol).
For example, if the mass of the sample is 272 grams, the number of moles of anhydrate present would be:
moles = 272 / 136
= 2
Please provide me with more information so that I could give you more accurate answer.
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a bond that forms between an electronegative atom and a hydrogen atom with a positive dipole____
A bond that is formed between an electronegative atom and a hydrogen atom with a positive dipole is called a Hydrogen Bond.
Hydrogen bonding is a special and important type of dipole-dipole attraction between molecules, unlike a covalent bond, to a hydrogen atom. It results from the attractive force existing between a hydrogen atom covalently bonded to a very electronegative atom such as a Nitrogen, Oxygen, or Fluorine atoms or any other very electronegative atom. Hydrogen bond strengths range from 4 kJ(kilojoule) to 50 kJ per mole of hydrogen bonds.
In molecules containing bonds of N-H, O-H or F-H, the large difference in electronegativity between the H atom and the other atoms of N, O or F leads to a highly polar covalent bond (i.e., a bond dipole).
Because of the difference in electronegativities of the atoms, the H atom bears a large partial positive charge and the other electronegative atoms of N, O or F bear a large partial negative charge.
Some examples of molecules or compounds having hydrogen bonding are as follows.
Water - A water molecule is composed of a highly electronegative atom of oxygen linked to the polar positive hydrogen atom.Ammonia - The hydrogen bonds in ammonia (NH3) molecule are formed between nitrogen and hydrogen atoms.Hydrogen FluorideCarboxylic Acid, etc.Learn more about Hydrogen Bond here:
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Why NH3 is polar but PH3 is nonpolar?.
NH3 is polar because it has a trigonal pyramidal molecular geometry and the nitrogen atom has a higher electronegativity than the hydrogen atoms, giving it a partial negative charge and the hydrogen atoms a partial positive charge.
This creates a dipole moment, making NH3 a polar molecule.
On the other hand, PH3 is nonpolar because it has a tetrahedral molecular geometry and the phosphorus and hydrogen atoms all have the same electronegativity, so there is no dipole moment and no net separation of charge. Thus, PH3 is a nonpolar molecule.
The polarity of a molecule depends on its molecular geometry and the electronegativity of its atoms. The polar NH3 has a trigonal pyramidal shape with a more electronegative nitrogen atom, while the nonpolar PH3 has a tetrahedral shape with atoms of the same electronegativity.
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Please helpppp nowww pleaseeee
Answer:
phosphorus=38.27%
hydrogen=2.47%
oxygen=59.26%
What is the major attractive force that exists among different I2 molecules in the solid? Select one: A. covalent-ionic interactions. B. Dispersion forces. C.
The claim that sense neurons' cell bodies are located in the grey commissure, an expanded region of the dorsal root.
Dorsal nerve roots provide sensory neural signals to the central nervous system from the peripheral nervous system. Anatomically, a dorsal root ganglion develops from the dorsal root of the spinal nerves. For the central nervous system to react, they transmit sensory data from multiple peripheral receptors. It is generally recognised that DRG has a role in chronic pain. The first description of anaesthesia infiltration of the DRG was made in 1949. It has been possible to target the DRG using the dorsal root entry zone (DREZ), a nearby related neural target, dorsal rhizotomy or gangliectomy, conventional radiofrequency denervation, pulsed radiofrequency, and steroid injection.
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Which layer of the atmosphere is chemically stratified, with the lightest molecules riding above heavier molecules?a. the thermosphereb. the tropospherec. the mesosphered. the stratosphere
The stratosphere is the most chemically stratified layer in the atmosphere.
What is the stratosphere?
The stratosphere is the layer of the atmosphere that is chemically stratified, with the lightest molecules riding above heavier molecules. The ozone layer, which contains a high concentration of ozone (O3) molecules, is located in the stratosphere.
The stratosphere is located above the troposphere and extends from about 15 km to about 50 km above the Earth's surface. This layer is characterized by a relatively constant temperature and is mostly composed of nitrogen and oxygen molecules.
The ozone layer protects the Earth from harmful ultraviolet radiation from the sun. Because ozone is lighter than the air below it, it remains in the stratosphere, while the heavier gases in the air below do not reach that high. This chemical stratification is maintained by the balance of ozone production and destruction processes in the stratosphere.
Hence, the stratosphere is the most chemically stratified layer in the atmosphere.
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In the activity series, the more active elements are found
(a) at the bottom
(b) in the middle
(c) at the top
(d) both (a) and (c)
In the activity series, the more active elements are found at the bottom and at the top. Option d.
The activity series is a way of organizing elements according to their reactivity.
The elements found at the bottom of the series are the most active, and those found at the top are the least active.
Knowing the activity series can help us predict how a reaction will proceed, and can be a useful tool when determining which compounds are most likely to form in a given reaction.
The elements at the bottom of the activity series are the most active, and the elements at the top are the least active. Knowing the activity of elements can help you understand the chemical properties of different materials and how they may interact with each other.
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____are small subunits, that when combined, form polymers.
Answer: Monomers are small subunits, that when combined, form polymers.
Explanation: I hope this helps!
Rank these compounds by their expected solubility in hexane, C_6H_14.
Based on its solubility in hexane, C₆H₁₄. Then the order of these compounds is C₃H₈ → CH₃OH → H₂O
Non-polar compounds are compounds that are formed due to the existence of a bond between electrons in the elements that form them. This happens because the bonding elements have the same or nearly the same electronegativity value.
Polar compounds have a high dipole moment, while nonpolar compounds do not have a dipole moment. This difference causes the two solutions to not bond.
Hexane is non-polar.
So, C₃H₈ is the easiest to dissolve because C₃H₈ is also non-polar.
H₂O is more polar than CH₃OH. So, CH₃OH will dissolve more easily than air. air will at least dissolve.
So that the order based on its solubility with hexane is C₃H₈, CH3OH, H₂O.
Your question may incomplete, for complete questions it's in the picture.
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What are the two types of carbohydrates and food sources?.
Answer: simple and complex.
Explanation:These are also called simple sugars. They're found in refined sugars, like the white sugar you see in a sugar bowl. If you have a lollipop, you're eating simple carbs.
What is the average speed of a bicyclist who rides 75 km in 2.5 hours? please show how you worked it out if you can bc my teacher is very specific
Answer:
30
Explanation:
I’m pretty sure it is
You have 20.0 G of sodium you want to Nixes sodium with chlorine to create the salt NaCl using percent composition determine what mass of chlorine you need to create the maximum possible amount of NaCl
The mass of chlorine needed to create the maximum amount of NaCl would be, Chlorine mass =41.56 g Cl x 33.2% = 13.7 g Cl.
How determine the mass of chlorine?To determine the mass of chlorine needed to create the maximum possible amount of NaCl, we must first look at the percent composition of sodium chloride. Sodium chloride is composed of 58.44% Na and 41.56% Cl. This means that for every 100 grams of sodium chloride, 58.44 grams is sodium and 41.56 grams is chlorine. Since we have 20.0 g of sodium, we can calculate the amount of chlorine needed to create the maximum amount of sodium chloride. First, convert 20.0 g of sodium to a percentage: 20.0 g of sodium is 33.2% of 58.44%. Then, multiply 41.56 grams of chlorine by 33.2%: 41.56 g Cl x 33.2% = 13.7 g Cl. Therefore, the maximum amount of sodium chloride that can be created from 20.0 g of sodium and 13.7 g of chlorine is 34.1 g. To create this amount of sodium chloride, we need 20.0 g of sodium and 13.7 g of chlorine.To learn more about mass of chlorine refer :
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The mass of chlorine needed to create the maximum amount of NaCl would be, Chlorine mass =41.56 g Cl x 33.2% = 13.7 g Cl.
How determine the mass of chlorine?To determine the mass of chlorine needed to create the maximum possible amount of NaCl, we must first look at the percent composition of sodium chloride.
Sodium chloride is composed of 58.44% Na and 41.56% Cl. This means that for every 100 grams of sodium chloride, 58.44 grams is sodium and 41.56 grams is chlorine.
Since we have 20.0 g of sodium, we can calculate the amount of chlorine needed to create the maximum amount of sodium chloride.
First, convert 20.0 g of sodium to a percentage: 20.0 g of sodium is 33.2% of 58.44%. Then, multiply 41.56 grams of chlorine by 33.2%: 41.56 g Cl x 33.2% = 13.7 g Cl.
Therefore, the maximum amount of sodium chloride that can be created from 20.0 g of sodium and 13.7 g of chlorine is 34.1 g.
To create this amount of sodium chloride, we need 20.0 g of sodium and 13.7 g of chlorine.
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why do you think land is considered a resource
Answer:
Land is considered as an important resource as it provides habitation to a wide variety of flora and fauna. It is also used by human beings for various purposes such as agriculture, forestry, mining, building houses and roads, and setting up industries.
Nitrogen monoxide reacts with hydrogen gas to form nitrogen gas and water (vapor). Write a balanced equation for this reaction. The reaction is experimentally found to be (approximately) first-order in H
2
and second-order in NO. Write down the form of the experimentally-determined rate law and the units of the rate constant.
We must now strike a balance. This portion is all guesswork, but look at nitrogen on the right; there are two of them, so we put a "2" next to nitrogen monoxide.
We then count to check whether everything is balanced, and we'll notice that there are now two oxygens on the left and only one on the right, so we'll put a "2" next to the water. Count again, and lastly, a "2" next to the hydrogens will give us a balanced equation of:nitrogen monoxide. Now there are rate laws. If your reaction was A+B—>C+D. The rate law is equal to some empirically established constant "k" times the concentration of the reactants increased to some value. power (also empirically determined) (also experimentally determined). So the general form is as follows: Alpha and Beta are just the order of the reactants. Because the question specifies the sequence of each reactant, your rate law should look like this.
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4. How many liters of gas are found in a balloon that contains 1.34x1025 molecules of gas at
Standard temperature and pressure
a. There are 22.4 L of gas in 1 mole at STP
At standard temperature and pressure (STP), one mole of a gas occupies a volume of 22.4 liters is 0.22 Liters.
How to determine standard temperature and pressure?To determine the number of liters of gas in a balloon containing a certain number of gas molecules, we can use the ideal gas law. To convert from the number of molecules to the number of moles, we can use Avogadro's number, which is the number of atoms or molecules in one mole of a substance. Avogadro's number is 6.022 x 10^23 atoms or molecules per mole.So, to find the number of moles of gas in the balloon, we can divide the number of molecules of gas by Avogadro's number:1.34x10^25 molecules / 6.022x10^23 molecules/mole = 2.23 molesTherefore, using the Ideal gas law, we can find the volume of the gas in the balloon at STP:V = nRT/PV = 2.23 * 8.314 J/mol.K / 101.325 kPa = 0.22 Liters.One mole of a gas occupies a volume of 22.4 liters at STP.Avogadro's number is the number of atoms or molecules in one mole of a substance, and is approximately 6.022 x 10^23 atoms or molecules per mole.The number of moles of gas in the balloon can be found by dividing the number of molecules of gas by Avogadro's numberUsing the Ideal gas law, we can find the volume of the gas in the balloon at STP, which is 0.22 Liters.To learn more about standard temperature refer:
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Explain how two species can indirectly compete for the same resource even when they never come in contact with one another. Describe an example to show direct competition.
Two species can indirectly compete for the same resource even when they never come in contact with one another if they depend on the same resource but at different times.
An example of indirect competition is for example where two insect feeds on a certain plant during the day and another species feeds on the same plant during the night.
What is indirect competition?Indirect competition occurs when animals that use the same resource don't necessarily interact with one another, such as cheetahs that are active during the day and leopards that are active at night that shares a watering hole in a grassland savanna.
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A sealed container can hold
6.28 L CO2 at 1.00 atm and 293 K.
How many moles of CO2 fill the
container?
Answer:
0. 261
Explanation:
Use ideal gas formula: PV = nRT, meaning that constant R = [tex]0.08206\frac{(L)(atm)}{(K)(mol)}[/tex]
[tex](1 atm)(6.28L) = n(0.08206\frac{(L)(atm)}{(K)(mol)})(293 K) \\n = \frac{(1 atm)(6.28L)}{(0.08206\frac{(L)(atm)}{(K)(mol)})(293 K)} \\n = 0.26119...\\n = 0.261[/tex]
Given g(x) = f(x) + k, enter the value for k that transforms the function f into g?.
The value for k that transforms the function f into g is -3.
What is the meaning of value for k?
Value for k is a term used in mathematics to refer to the number of elements in a set. The value of k depends on the context of the problem. It could be any numerical value, depending on what it is being used for.
Given : g(x) = f(x) + k
Taking two points from the graph (1,0) and (-1, 2)
slope = [tex]\frac{2-0}{-1-1}[/tex] = [tex]\frac{2}{-2}[/tex] = -1
The equation will be,
y-0 = -1 (x-4)
y= -x + 4
f(x)= -x + 4
So, g(x)= f(x) + k
-x + 1= -x + 4 + k
k= 1+4
k= -3
Therefore, the value for k= -3.
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n physical changes, substances might change in ________ but not in ________.
Answer: Physical properties, but not in its identity
Explanation:
Physical changes only change the substances physical properties, not the substance’s identity
Which prediction best shows what the population could look like after many generations? What caused it to change?
Prediction 1 best shows what the population could look like after many generations. Because, the long beak traits is having more life time.
What is genetic traits ?Each characteristics in a living thing is created by a respective genetic coding in its body. The genetic code which is responsible for a particular behavior or appearance is called a genetic trait.
Here, the prediction 1 is best . It already saying that long-beak hummingbirds are more likely to survive, that baby survived long enough to pass on its mutation, so the long-beak trait became more common over generations.
Prediction 2 says abut a genetic trait which is less fit to survive. Hence, cannot affect the next generation population. Therefore, prediction 1 is best.
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Your question is incomplete. But your complete question probably was:
Prediction 1 :Two hummingbirds with short or medium beaks had a baby with a mutation in its genes for the long-beak trait.
Prediction 2 is best. A hummingbird could have been born with a mutation in its genes for the long-beak trait and lived for a little while.
The fact that most compounds of this chemical class with synthesized from the combination of carbon and water accounts for the derivation of the term
Carbohydrate. The word derives from the fact that the majority of compounds in this chemical class are produced from the combination of carbon and water.
Water is a compound because it is made up of two elements: hydrogen and oxygen. Water, on the other hand, is not the same as oxygen or nitrogen. While water is a liquid, oxygen and nitrogen are gases. To be more specific, all quantitative estimates are made for glucose, the most important hexose in human metabolism. Organic compounds are those with a carbon atom backbone, whereas all other compounds are classified as inorganic. Carbohydrate. The word derives from the fact that the majority of compounds in this chemical class are produced from the combination of carbon and water.
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Rearrange the work equation and show the equation for force.
Work equation: W=Fxd
Answer:
Force=Work done÷ distance travelled
Explanation:
To do this, you want to make the Force variable on its own so you divide d on both sides to get F=W/d
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What is the percent yield if 18 grams of water are produced when 4 grams of hydrogen with excess oxygen?
To calculate the percentage yield of a reaction, you need to know the theoretical yield (the maximum amount of product that can be produced based on the stoichiometry of the reactants) and the actual yield (the amount of product that is actually produced in the reaction).
The balanced equation for the combustion of hydrogen gas (H2) with oxygen gas (O2) to form water vapour (H2O) is:
2H2 + O2 -> 2H2O
From the balanced equation, we can see that for every 2 moles of H2, 1 mole of H2O is produced. To convert 4 grams of H2 to moles, we use the molar mass of H2 which is 2.016 g/mol.
4g / 2.016 g/mol = 1.98 moles
Now we can calculate the theoretical yield of H2O. Since 2 moles of H2O are produced for every 2 moles of H2, the theoretical yield of H2O is:
1.98 moles x (2 moles H2O / 2 moles H2) = 1.98 moles
The molar mass of H2O is 18.02 g/mol, we can convert the theoretical yield of H2O from moles to grams:
1.98 moles x 18.02 g/mol = 35.7 g
To calculate the percentage yield, we divide the actual yield (18 g) by the theoretical yield (35.7 g) and multiply by 100:
(18 g / 35.7 g) x 100 = 50.5 %
Therefore, the percentage yield of the reaction is 50.5%.
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In area of higher core, what help you maintain healthy behavior? Conider your peronal knowledge about what it mean to be healthy and your attitude and belief. Then conider the other level of the ocioecological model—conider how you are upported by friend and family, your chool community and living ituation, intitution to which you belong, and local or national policie
A healthy behavior can be maintained by maintaining healthy relationships with supportive friends and family, keeping good hygiene, having enough sleep, exercising etc.
Maintaining a healthy behavior is very important not just for our emotional and mental health but also for our overall physical as well as social well being too. Our behavior reflects our attitude as well as our beliefs.
A healthy behavior can be maintained by healthy social interaction amongst our peers, supportive friends, family and also in the community as well as institution which we are a part of. One can also maintain healthy behavior by adopting healthy habits like exercising, sleeping on time, keeping good hygiene etc.
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Are CO2 and SO2 polar or nonpolar?.
Answer:
Polar and nonpolar
Explanation:
CO2 is a nonpolar molecule meaning it has equal sharing of electrons
SO2 is a polar molecule meaning that the oxygen pulls slightly more giving it a more bent shape as it has a more negative and a more postive side
acid rain is the result of pollutants being released into the____
The acid rain is the result of pollutants being released into the atmosphere.
What is acid rain ?
Nitric and sulfuric acids, which are included in acid rain and other dry, abrasive particles that fall to the ground, can harm the surfaces of sculptures, buildings, and other man-made structures. Metal is corroded by the acidic particles, which also hasten the aging of stone and paint.
What is pollutants ?
A material that is present in concentrations that could be harmful to creatures (including people, animals, and plants) or go beyond the limits of acceptable environmental quality is referred to as a pollutant. Frequently, the words "term" and "contaminant" are used interchangeably.
Therefore, acid rain is the result of pollutants being released into the atmosphere.
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