For the rate of reaction a negative sign is used is when expressing the change in concentration of a reactant over time, such as −δ[a]/δt for the reaction A→B. Because the concentration of the reactant goes on decreasing with the time to form product.
What is Rate of the Reaction?The rate of reaction is defined as the rate of change of concentration of product and the concentration of reactant.
Let us considered a chemical reaction:
A → B
It can also be said that, rate of reaction is directly proportional to the concentration of reactant.
R = δ[B]/δt = -δ[A]/δt
Rate of the product is always positive because the concentration of the product always increases with time.
Thus, we concluded that due to continue decrease in the concentration of the reactant goes with time to form product, the rate of reaction expressed with a negative sign.
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HELP ME THIS IS MY FINAL QUESTION
All of the following are procedures used to reduce the amount of acid rain in the environment except...
Select one:
a. requiring that catalytic converters be installed on new automobiles.
b. installing scrubbers in smokestacks.
c. separating sulfur from coal before it is burned.
d. using leaded gasoline in automobiles.
All of the given procedures are used to reduce the amount of acid rain in the environment except using leaded gasoline in automobiles; option D.
What is acid rain?Acid rain refers to the condition in which oxide gases of non-metals released from combustion of fossil fuels dissolve in rain water to form acids which is then called acid rain.
Acid rain is mainly formed when sulfur oxides and nitrogen oxides released from combustion of fuels dissolve in rainwater.
Acid rain results in polluted water an also affects the organisms found in the environment.
Some procedures used to reduce the amount of acid rain in the environment include:
requiring that catalytic converters be installed on new automobiles.installing scrubbers in smokestacks - scrubbers remove harmful particles and gases from industrial exhaust smokeseparating sulfur from coal before it is burned to prevent formation of sulfur oxideTherefore, using leaded gasoline in automobiles will not reduce the amount of acid rain in the environment.
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HELP MEEEEEE
Which of the following is an example of a neutralization reaction?
A) 2 H2O (I) --> 2 H2 (g) + O2 (g)
B) 2 Na(s) + H2SO4 --> NaSO4 + H2(g)
C) CO2(g) + H2O --> H2CO3
D) HCI + KOH --> KCI + H2O
Select one:
a. A
b. B
c. C
d. D
Answer:
D) HCl + KOH --> KCl + H2O is the answer
a chemist measured the amount of rubidium chloride produced during an experiment. she finds that of rubidium chloride is produced. calculate the number of moles of rubidium chloride produced.
The mass of rubidium chloride that participates is 731.57 g
Complete Question
The chemical formula for rubidium chloride is RbCI. A chemist determined by measurements that moles of rubidium chloride participate in a chemical reaction are 6.05 mol. Calculate the mass of rubidium chloride that participates. Be sure your answer has the correct number of significant digits.
The mass of rubidium chloride that participates is 731.57 g
It is known that number of moles is equal to mass divided by molar mass of the substance.
No. of moles = given mass/molar mass
It is known that molar mass of RbCl is 120.921 g/mol.
Hence, calculate the mass of RbCl for 6.05 mol as follows.
No. of moles = given mass / molar mass
6.05 mol = mass/120.921g/mol
mass = 731.57 g
Therefore, we can conclude that mass of rubidium chloride that participates is 731.57 g.
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Cellular respiration transforms glucose and oxygen into carbon dioxide, water, and energy. c6h12o6 6o2 → 6co2 ?h2o energy based on the law of conservation of matter, what is the missing coefficient for water?
On the basis of the law of conservation of matter, the missing coefficient for water is 6 in the process of cellular respiration. Thus, the correct option is 1.
What is cellular respiration?It is possible to define cellular respiration as a chemical process that results in the breakdown of food inside the cell and the release of ATP, which is a type of energy.
It entails the chain of chemical processes through which organic materials are oxidized to provide energy to living things.
The left side of the equation has 6 molecules. The equation must be balanced so it must be 6 for the coefficient of water.
C₆H₁₂O₆
Thus, the correct option is 1. six, 6.
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The question is incomplete. Your most probably complete question is given below:
1. 6
2. 8
3. 4
4. 2
calculate the average atomic mass of lead based on the given data and the atomic masses. isotope atomic mass (amu) percent abundance pb-206 205.97 14.5 pb-207 206.98 17.0 pb-208 207.98 68.5
The average atomic mass of lead given its three isotopes is 207.52.
What is average atomic mass?Average atomic mass is the weighted average of the atomic masses of the naturally occurring isotopes of an element.
According to this question, the following isotopes with their percent abundance and atomic masses of lead are given:
Pb-206 - 205.97 14.5%Pb-207 - 206.98 17.0%Pb-208 - 207.98 68.5%Pb-206 = 14.5/100 × 205.97Pb-207 = 17/100 × 206.98Pb-208 = 68.5/100 × 207.98Pb-206 = 29.865Pb-207 = 35.186Pb-208 = 142.466The average atomic mass is as follows: 29.865 + 35.186 + 142.466 = 207.52
Therefore, the average atomic mass of lead given its three isotopes is 207.52.
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Glassware that allows a solution to be precisely and slowly added to another solution.
A glassware that allows a solution to be precisely and slowly added to another solution is a Burette.
Burette, a laboratory apparatus used in quantitative chemical analysis to measure the volume of a liquid or a gas. It consists of a graduated glass tube with a stopcock (turning plug, or spigot) at one end. The tube of the burette is filled with a fluid, such as water, oil, or mercury.
Burette is also used in Titration. It is a process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them.
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do numbers 9) and 12) asap!! thanks you!!
Explanation:
for 9 i don't know the answer but it's 0.00000901 and for 12 it's 0.0027651
A cup of gold colored metal beads was measured to have a
mass 425 grams. By water displacement, the volume of the
beads was calculated to be 47.5mL. Given the densities listed in
The density of the gold colored metal beads if mass is 425 g and volume of 47.5mL is 8.9 g/mL.
What is density?Density is defined as the ratio of the Mass of the substance to the volume of the substance.
It's SI unit is kg/m3.
It is denoted by ρ or rho.
Density = mass/volume
From the given data, we noticed that,
Mass of gold colored metal beads = 425g
Volume of the gold colored metal beads = 47.5mL.
By substituting all the value, we get
= 425/47.5
= 8.9
Thus, we concluded that the density of the gold colored metal beads if mass is 425 g and volume of 47.5mL is 8.9 g/mL.
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What does it mean when there is a number before a chemical letter but a small number underneath it in science
Explanation:
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound.
polar attractions are ... polar attractions are ... (a) forces between atoms with partial charges. (b) weaker than covalent bonds. (c) important because they are numerous. (a) and (b) are true. (c) is false. (a), (b), and (c) are correct. submit
polar attractions are ... polar attractions are (a), (b), and (c) are correct.
Briefing :Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells.
What are polar attraction ?Between atoms with partial charges, polar attractions take place that are weaker than covalent bonds. Nevertheless, they are significant because so many of them take place in live cells. can happen inside a water molecule and can develop between H and N.
We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can pull or pull away from one another (opposite charges attract, alike charges repel).
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3 of 103 of 10 Items
25:14
Question
Choose the words or phrases that apply to this scenario.
Several experiments in the 1800s demonstrated that the tips of plants are responsible for detecting light, which causes the stem of the plant to elongate and bend towards the light.
Which of these phrases are accurate about the experimental design and its validity? (Choose 3)
A The light levels should increase during the experiment as the plant grows.The light levels should increase during the experiment as the plant grows.
B All species of plants behave the same way.All species of plants behave the same way.
C The experiment should be repeatable by the same researcher.The experiment should be repeatable by the same researcher.
D A control plant with no light or top light would likely show no bending.A control plant with no light or top light would likely show no bending.
E The experiment should be replicated by different researchers.
The accurate phrases abut the study design and validity are:
All species of plants behave the same way A control plant with no light or top light would likely show no bending.The experiment should be replicated by different researchers.What is the role of light in the growth of plants?The role of light in the growth of plants is important as light is necessary for photosynthesis.
The growth regions of a plant are the shoots and the roots.
The shoots of plants show positive phototaxis by growing towards a unidirectional light source.
A unidirectional light source is light that comes from one direction.
The growth region of the shoot, that is the tips produces hormones which enable the tip of the plant to grow towards the light source.
Considering the given experiment , the accurate phrases abut the study design and validity are:
All species of plants behave the same way A control plant with no light or top light would likely show no bending.The experiment should be replicated by different researchers.In conclusion, the experiment to demonstrate the bending of plants shoots towards a light source should include a control and must be repeated by other researchers,
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(help please 20 points!!)
Explain why mass is used to measure the properties of solids, liquids, and gases.
Mass takes into account the force of gravity.
Mass is a measure of weight that stays constant.
Mass is a measure of matter that does not change.
Mass and gravity are both necessary for accurate measurements.
Mass is an extensive property of a matter which describes the number of particles in a matter. According to the law of conservation of mass "mass can neither be created nor be destroyed." Hence mass is a quantity which never changes whether a particle is in a solid, liquid or gaseous state.
Q
Unit
If the rules for significant figures
are observed in the addition
example shown, how should the
total for this addition be rewritten?
A. 5,610.00
B. 5,610.340
C. 5,610.34
D. 5,610.3
35.7
432.33
+ 5,142.312
5,610.342
The correct answer to the addition of the given number will be D. 5,610.3 based on the rules for addition with significant figures.
We have to find the addition of:
35.7 + 432.33 + 5,142.312 = 5,610.342
However, according to the rule for significant figures, if the addend with the fewest decimal places is 1, the final consequent will also have one decimal place. If the lowest addend is 2, the final consequent will have two decimal places, and so on.
Because significant numbers are established in the form of digits, they are also known as significant digits. The number of significant digits can be determined by counting all of the values beginning with the first non-zero digit on the left. These numbers are dependable and required to represent the quantity of a length, volume, mass, measurement, and so on.
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what is the cost to drive in san fransisco to la (405 miles) if the cost of gasoline is $3.85/gal and the car gets 24 mil/gal?
The cost of travelling from San Francisco to Los Angeles is $65
What is the cost of driving?
Now we know that it could be expensive to use an automobile because of the cost of gasoline. The cost of the use of gasoline depends on the distance that is travelled.
If 1 gallon is required for 24 miles
x gallons is required for 405 miles
x = 405 miles * 1 gallon/24 miles
x = 16.9 gallons
Now;
If 1 gallon costs $3.85
16.9 gallons costs 16.9 gallons * $3.85/1 gallon
= $65
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My pen weighs 24.08grams and when dropped in a graduated cylinder of water that has initial volume of 43mL and final volume 56mL . What is the density of the pen?
Make sure you write you answer with proper sig figs. Density = mass/volume
Taking into account the definition of density, the density of the pen is 1.8523 g/mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
From this expression it can be deduced that density is inversely proportional to volume.
Density of the penIn this case, you know that:
Mass of the pen= 24.08 gInitial volume= 43 mLFinal volume= 56 mLVolume of the pen= Final volume - Initial volume= 56 mL - 43 mL= 13 mLReplacing in the definition of density:
density= mass of the pen÷ volume of the pen
density= 24.08 g÷ 13 mL
Solving:
density= 1.8523 g/mL
In summary, the density of the pen is 1.8523 g/mL.
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Chemical
Part I: The Big Picture
1. When we look at the periodic table of elements, why do we not see substances such as
water listed there?
use
they
Answer:
Water is H2O which is a compound and would therefore not be on the periodic table. The periodic table only consists of elements.
3. Kristen was arrested for stealing 6.532 tons of gold from the armory in North Carolina.
She escaped capture for 2.45 days; until she was picked up on the side of the road for
jaywalking. At this time, she had had already hid some of the gold, but had 2.34 tons of
gold still with her. The gold with her was confiscated by police. a) How much money did
she make from the gold? b) How much room/volume does the gold take up?
a)
1,63760 money she make from the gold and volume of gold take 5.295 volume is the amount of space occupied by a substance
Here given data is kristen was arrested for stealing 6.532 tons and then She escaped capture for 2.45 days and then she had already hid some of the gold, but had 2.34 tons of gold still with her
We have to find how much money did she have if 2.34 tons of gold still with her = ? and how volume does gold take up = ?
Volume is the amount of 3D space a substance or object occupies
We have to convert 2.34 tons into money
Then 2.34 tons = 1,63760 money
And the formula to find volume is:
volume = mass/density
Mass of gold = 196.96 and density = 18.31
Volume = mass of gold / density
Volume = 196.96 / 18.31
Volume = 5.295
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A compound has an empirical formula BH3 and a molar mass of 27.6 g/mol. What is the molecular formula of the
compound?
The molecular formula of the compound having an empirical formula BH₃ and a molar mass of 27.6 g/mol is B₂H₆.
Empirical formula is the whole number ratio of the atoms which are present in the compound.
Molecular formula is the number of atoms of each element present in one molecule of compound.
Given -
Empirical formula = BH₃
Molar mass = 27.6 g/mol
We must find the empirical mass of the compound,
Molar mass of B = 10.8 amu
Molar mass of H = 1.00 amu
Therefore,
Empirical mass = 10.8 amu + (3 x 1.00) amu = 13.8 amu
To find molecular formula, we divide the molecular mass by the empirical mass. So,
Molecular formula = Molecular mass
Empirical mass
Molecular formula = 27.6
13.8
Molecular formula = 2
Hence, the molecular formula of the compound is BH₃ = B₁ₓ₂H₃ₓ₂ = B₂H₆
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An oxide of iron is found to be 70. 00% iron by mass. Determine the empirical formula for this compound and name it.
The empirical formula of iron oxide is Fe2O3 and its name is ferric oxide.
Given:
Percentage of iron by mass = 70%Molar mass of iron = 55.85Percentage of oxygen by mass =30 %Molar mass of oxygen =16Solution:
Now, calculate the relative mass of iron in iron oxide = Percentage of iron by mass / At. mass of iron
Relative mass of iron = 70/55.85 = 1.25
Relative mass of oxygen = Percentage of oxygen by mass / At. mass of iron = 30/55.85 = 1.88
Now the calculate the molar ratio of iron to oxygen = 1.25 : 1.88 = 2:3
Thus, the empirical formula of iron oxide is Fe2O3 and its name is ferric oxide.
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A sample of hydrogen gas, H₂, has a volume of 5.86 L at a temperature of 273K and a pressure of 1.5 atm. Calculate the number of moles of H₂ present in this gas sample. Assume that gas behaves ideally.
a
5.86 mol
b
0.57 mol
c
0 mol
d
0.39 mol
The option (d) will be correct, that is the answer would be 0.39 mol.
Ideal gas equation is also known by the name of the general gas equation.
It is already mentioned in the problem,
Volume , V = 5.86 L
Temperature , T = 273 K
Pressure, P = 1.5 atm
Ideal Gas Equation : PV = nRT
n = PV / RT
= 1.5 atm * 5.86 L / 0.0821 L atm mol^-1 K^-1 * 273 K
= 8.79 / 22.41 mol
=0.39 mol
Hence the number of moles of H2 found in the gas sample is 0.39 mol.
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a chemist must prepare of aqueous aluminum sulfate working solution. she'll do this by pouring out some aqueous aluminum sulfate stock solution into a graduated cylinder and diluting it with distilled water. calculate the volume in of the aluminum sulfate stock solution that the chemist should pour out. round your answer to significant digits.
The aluminum sulfate stock solution should the chemist pour out is 219.8 ml
Complete Question
A chemist must prepare 400 mL of 1.00M aqueous aluminum sulfate working solution. He'll do this by pouring out 1.82 mol/L aqueous aluminum sulfate stock solution into a graduated cylinder and diluting it with distilled water. How many mL of the aluminum sulfate stock solution should the chemist pour out?
The aluminum sulfate stock solution should the chemist pour out is 219.8 ml
Given:
V1 = 400ml, M1 = 1 M, V2 = ?, M2 = 1.82 M
Hence, the relation between molarity and volume is as follows.
M1V1 = M2V2
1.00M x 400ml = 1.82 x V2
V₂ = 219.8 ml
Thus, we can conclude that 219.8 ml of the aluminum sulfate stock solution should the chemist pour out.
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4. Calculate the density of helium from the fact that a balloon with capacity of 5.00
L holds 0.890 g.
The ratio of the mass in grams and volume in cubic meters gives the density. The density of 0.80 gm helium is 1.78 × 10 ⁻⁴ g/cm³.
Helium (He) is an inert gas and a chemical element belonging to Periodic Table Group 18 (noble gases). Helium, the second-lightest element (only hydrogen is lighter), is an odourless, tasteless gas that melts at a temperature of 268.9 °C (452 °F).
Helium has lower freezing and boiling points than any other known substance. The only element that cannot solidify by adequate cooling at standard atmospheric pressure is helium; in order to solidify it, pressure of 25 atmospheres at a temperature of 1 K (or 272 °C or 458 °F) must be applied. density (0 °C, 1 atm): 0.1785 grammes per litre
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what is the symbol for the element with an electron configuration of 1s^22s^22p^31s 2 2s 2 2p 3 1, s, squared, 2, s, squared, 2, p, cubed?
The correct answer is Nitrogen.
From the given question the electronic configuration of the element is given as:
1s²2s²2p³
hence, we know that the maximum no of electrons in the sub-shell
s= 2
p=6
while in this p has only 6 electrons.
Thus by counting the number of electrons in each sub-shell we can know the atomic number as several electrons in an atom is equal to the atomic number of the atom.
thus, the no of electrons present is- 2+2+3= 7
For, 7 electrons the element present will be nitrogen with atomic number 7.
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Which statement best describes why a chemical change is different from a physical change?
A chemical change is used to identify characteristics of a substance, and a physical change identifies the behavior of a substance when in a reaction.
A chemical change results in a new substance being formed, whereas a physical change will result in a different state of matter.
A chemical change results in a different state of matter, and a physical change results in a new substance being formed.
A chemical change is used by scientists to create new substances, and a physical change happens naturally.
Answer:
A chemical change results in a new substance being formed whereas a physical change will result in a different state of matter
solve this problem. a sample of liquid aluminum with mass of 4.39g. the density of liquid aluminum is 2.7 g/cm3. what is the volume of this sample?*1 point
The more the volume of the substance less dense will be the substance. The sample of liquid aluminum with a density of 2.7 g/cm³ has a volume of 1.62 cm³.
What is the relation between volume and density?The volume has been the space that is in inverse relation to the density of the substance and gets increased with less dense substances while decreasing with more dense substances.
Given,
Mass of aluminum = 4.39 gm
Density of aluminium = 2.7 g/cm³
The volume of Al is calculated as:
Volume = Mass ÷ Density
V = 4.39 ÷ 2.7
= 1.62 cm³
Therefore, the volume of liquid aluminum is 1.62 cm³.
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SEP construct explanations what is the difference between a molecule and a compound
The difference between a molecule and a compound is a molecule is made up of pure substance and the same type of atoms, but a compound is made up of different kinds of atoms.
What are molecules and compounds?Molecules are substances that are made up of the same type of atoms. Examples are N³, O³- ozone, etc.
Compounds are made up of different kinds of atoms. Examples of compounds are water, made up of hydrogen and oxygen. H₂O.
Thus, a compound is made up of various types of atoms, as opposed to a molecule, which is composed of a pure substance and the same type of atoms.
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if only 0.264 g of ca(oh)2 dissolves in enough water to give 0.178 l of aqueous solution at a given temperature, what is the ksp value for calcium hydroxide at this temperature?
The ksp value for calcium hydroxide at this temperature is 5.20 × 10⁻⁶.
What is ksp?Ksp is an equilibrium constant of a solid substance dissolved in a liquid solution.
Given that, the volume of water is 0.178 l, 0.264 g of Ca(OH)² dissolves in enough water
The solution equilibrium is
Ca(OH)² = Ca + 2OH
The molar solubility is
0.186 / 74.00 / 0.230 = 0.0109 M
The ksp value will be
Ksp = (s) (2S)²
Putting the values in the formula
(0.0109) x (2 x 0.0109)² = 5.20 × 10⁻⁶.
Thus, the ksp value for calcium hydroxide is 5.20 × 10⁻⁶.
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Draw the conjugate acid for the following base (lone pairs do not have to be drawn):
move double bond add line pairs to Oxygen and make negative then move a double bond into the hexagon
Which of the following is TRUE about
scientific laws?
states that something will happen
universally observable
attempts to explain why something
happens in nature
a statement or equation that reliably
predicts patterns or events
Answer:
c
Explanation:
As we know science is all about fact so from many years scientist use to predict the future or events so answer is in my opinion c
If I have 3.40 moles of gas at a pressure of 1.20 atm, a volume of 31.00 liters, what
temperature is the gas?
The temperature of the gas is 133.42 kelvin.
Assuming that the gas in the question is ideal, we can apply the ideal gas equation which is as follows:
PV = nRT
Here P is the pressure of the gas = 1.20 atm
V is the volume of the gas = 31.00 liters
N is the number of moles = 3.40 moles
R is the universal gas constant = 0.0821 L atm
T is the temperature of the gas =?
Putting the values in the above equation:
1.20 x 31.00 = 3.40 x 0.0821 x T
T = 1.20 x 31/3.40 x 0.0821
T = 133.42 K
Thus, the temperature of the gas is 133.42 kelvin.
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