Answer:
Positive catalysts are those catalysts which increase the rate of the reaction This means that the activation energy of the reaction is lowered, and the speed of the reaction also increases. An example of positive catalysis is decomposition of potassium chlorate.
Explanation:
Liquid A and Liquid B are clear liquids. They are placed in open containers and allowed
to evaporate. When evaporation is complete, there is a white solid in container A, but
no solid in container B. Fromthese results, what can you infer about the two liquids?
(Choose all that are correct.)
A buffer resists change in ph when ___________ amount of acid or base is added to it.
A buffered solution will resist changes in pH when small amounts of acid or base are added.
How does a buffer withstand pH changes?Buffers are solutions that resist pH changes when small amounts of acid or base are added. They are able to do so because they contain an acidic component, HA, which neutralises OH- ions, and a basic component, A-, which neutralises H+ ions. Because Ka is a constant, the [H+] will be directly proportional to the [HA]/[A-] ratio. Buffer, as defined, is a conjugate acid-base pair that can withstand pH changes when small amounts of strong acids or bases are added. When a strong base is added, the buffer's acid neutralises the hydroxide ions (OH -start superscript, start text, negative, end text, end superscript).The strong acid reacts with the weak base in the buffer to form a weak acid, which produces few H ions in solution and therefore only a little change in pH.To learn more about A buffer resists change in ph refer to
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While you are conducting your experiment, you notice that the ball bounces at a different height and in a different direction for each trial. You look at the ground and see it is uneven. What could you do?
8th grade science
Which statements describe kinetic and potential energy? CHECK ALL THAT APPLY.
O Energy can be stored in the position of an object.
O Energy is not present in a moving object.
O Energy can be stored in the position of the particles that make up a substance. O Energy exists as movement of the particles of a substance.
O Energy is greater in faster-moving particles than in slower-moving particles. O Energy is lower in objects with greater mass than in objects with less mass.
Answer:
A and D is what I got hopes this helps
A 2.42 g sample of a mixture of kcl and mgcl2 is treated with excess agno3(aq). if 5.52 grams of agcl(s) are obtained, then what is the percentage by mass of kcl in the original mixture?
The % by mass of KCl in the original mixture is 40%
Given:
Mass of AgCl, m = 5.52g
Molar mass of AgCl, mm = 143.32g/mol
Mass of sample mixture, ms = 2.42g
Molar mass of KCl = 74.5513g/mol
To find:
Mass of KCl = ?
Formula:
Mass of KCl = no. of moles x molar mass
% = Mass of KCl / Mass of sample mixture x 100
Calculations:
n AgCl = 5.52 / 143.32 = 0.039 mols
Since Moles of AgCl = 1 mole from 1 mole of KCL and 2 moles from 1 mole of MgNO3
1 mole of KCl forms 1/3 mole of AgCl
Therefore,
No. of moles of AgCl formed from KCl = 1/3 x 0.039 = 0.013 mols
Mass of KCl = 0.013 x 74.5513 = 0.969g
% = 0.969 / 2.42 x 100 = 40%
Result:
The % by mass of KCl in the original mixture is 40%.
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beryllium is found in beryllium aluminium silicate
the formula of beryllium aluminium silicate is Be3Al2(sio3)6
what is the ratio of atoms of each element in beryllium aluminium silicate?
the ratio of Be: Al: Sio : _:_:_:_
Answer:
3:2:6
There's 3 Beryllium atoms, 2 Aluminum atoms, and 6 Trioxidosilicate atoms.
The ratio of atoms of each element in beryllium aluminium silicate, the ratio of Be: Al: Si:o : 3:2:6:18.
What is atom?The building block of an element is an atom. An atom is a kind of stuff that cannot be further decomposed chemically. The three main components of an atom are protons, neutrons, plus electrons.
Some substances are either bigger or smaller than atoms. Examples of chemical species which are not commonly regarded as atoms include protons, neutrons, and electrons, which are atom-related particles.
Atoms make up molecules and compounds, however they are not actual atoms. The molecules and compounds salt, water, and methanol are examples of. Ions are the name for electrically charged atoms. The ratio of atoms of each element in beryllium aluminium silicate, the ratio of Be: Al: Si:o : 3:2:6:18.
Therefore, the ratio of Be: Al: Si:o : 3:2:6:18.
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Lithium has an atomic number of 3 and an average atomic mass of 6.941. how many protons does lithium have in the nucleus? 3 3 4 4 6 6 10
Lithium has 3 protons in the nucleus.
Atomic number is the number of protons or the number of electrons in the nucleus of a neutral atom.Mass number is the sum of the protons as well as the neutrons in the nucleus of an atom. ( sum of neutrons and protons = nucleons)Atomic number =number of protons =number of electrons
According to the question,
we have been given atomic number= 3
So, number of protons will be 3 and number of electrons will also be 3.
We can additionally calculate number of neutrons as follows-
number of neutrons= mass number - number of protons
= 6.941 - 3
≈ 4
Hence, the number of protons in lithium will be 3.
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The nucleus of Lithium has three protons.
The number of protons or electrons in the nucleus of a neutral atom is known as its Atomic number.
The total mass of an atom's protons and neutrons is known as its mass number. (neutrons and protons added together Equals nucleons)
Atomic mass= Mass number + Neutrons
Atomic number equals the sum of the protons and electrons
Since, atomic number given is 3
Therefore, protons in the nucleus will be 3.
Additionally, we may determine the neutron number using the formula below.
mass number = number of neutrons + number of protons
⇒ 6.941 = number of neutrons + 3
⇒ number of neutrons will be approximately 4.
Thus, lithium will contain three protons.
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4NaOH+2H₂CO3→2Na₂CO3+4H2O
What is the mass of 2H₂CO3?
Are the reactants elements or compounds?
Answer:
1. 62 grams 2. Compounds
Explanation:
assuming you want the molar mass, the answer to the 1st question is 62 grams.
The reactants are compounds due to there being 2 or more elements together
What would be the ph of solutions 8 and 9 give a relavent chmeical equation and related ph calculation compare the calculated value and experimental value?
The ph of solutions 8 is 4.75 and the PH of solution 9 is 9.25.
The pH of a solution is a measure of hydrogen ion concentration, which in turn is a measure of its acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions.
Now,
CH3COOH + NaOH -> CH3COONa + H2O
pH = p Ka + log [CH3COONa] /[снз соон]
4.15 +( log 0.10m x 5 mL/ (0.1 Mx 10 mL) - (0.10 x5))
pH= 4.75
Calculated value is less than experimental value.
For solution 9:
NH4NO3 + NaOH -> Na No3 + H2O + NH3
pH = P ka + log( [NH3] [NH4+])
= 9.25 + log ((0.10Mx5 mL) (0.1M x 10.0 mL -0.10 mx 5.0ml).
PH = 9.25
Calculated value is less than experimental value.
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For the reaction c2h6(g)=c2h4(g) h2(g) deltah= 137kj/mol and deltas= 120j/k. this reaction is______.
For the reaction c2h6(g)=c2h4(g) h2(g) deltah= 137kj/mol and deltas= 120j/k. this reaction is spontaneous.
What is spontaneous reaction?A spontaneous reaction is one that favours the creation of products under the reaction's current conditions.
A bonfire that is raging and exothermic is an illustration of a spontaneous reaction (there is a decrease in the energy of the system as energy is released to the surroundings as heat).
Exothermic reaction: This is a reaction when there is a decrease in the enthalpy.
At high temperatures, the reaction is spontaneous when both H and S are positive.
Let's take that back;
ΔG = ΔH - TΔS
Therefore, the reaction is spontaneous at high temperature when both H and S are positive.
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Substance
Sodium (Na)
Chlorine (CI)
Sodium Chloride
(NaCl)
Physical
Appearance
Shiny, soft, solid
metal
Greenish gas
C
White crystals
Boiling Point
(°C)
883
-34
1,465
Change When
Added to Water
Which statement best describes the properties of sodium chlorine, and sodium chloride?
A
All have similar physical properties but different chemical properties
B
All have similar chemical properties but different physical properties.
All have similar chemical and physical properties.
D All have different chemical and physical properties.
Forms new
compound
Forms new
compound
Dissolves in water
I gotta say it's D cause all of those all react differently towards another chemical.
Calculate the molar solubility of agcl in a solution made by dissolving 10.0 g of cacl2 in enough water to make up a 1.00 l solution.
Mass of CaCl2 = 10 g.
Volume of solution = 1 L.
To determine the solubility, the concentration of CaCl2 solution has to be determined.
The formula for calculating the Molarity (conc. in mol/L) is:
Molarity = Number of Moles of the solute/Volume of solvent in L
The number of moles of solute is determined using the formula:
Number of moles = Mass in g/Molar mass in g/mol = 10g/110.98 g/mol = 0.09 mole.
Now, Molarity = 0.09/1 = 0.09 M
So, the concentration of CaCl2 is 0.09M
CaCl2 dissociates into Ca2+ and 2Cl− ions as shown below.
CaCl2→Ca2+ + 2Cl−
The concentration of Cl− ions in the solution = 2×0.09M =0.18M.
Substitute these values in the expression for the solubility product
Ksp = [Ag+][Cl−] = s×(s+0.18)
Since the value of Ksp is very low, the value of s will be negligible compared to 0.052, and hence,
(s+0.18) ≈0.18
Ksp = s×0.18
1.8×10^−10 =0.052 s
s = 1.8×10^−10/0.18
s = 10 x 10^-10 or 1 x 10^-9M
Therefore, the solubility of AgCl in the given CaCl2 solution is 1x10^-9 M
What is Molar solubility?The amount of moles of a solute that can dissolve in a solvent before it becomes saturated is known as molar solubility. The amount of solute that dissolves in a liter of solution is most frequently expressed as the number of moles. As a result, it is typically expressed as "M" and measured in moles/liter.
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3. What are the values of the graduations (unmarked lines) in each of the
following graduated cylinders?
Q
(A)
50
3
graduations =
(B)
50
-40
-30
-20
10
graduations =
(C)
25
-20
-15
10
5
graduations =
The values of the Graduations for A , B and C will be 0.2 ml, 2ml and 1ml respectively.
Graduated Cylinder - A popular piece of scientific equipment used to measure the volume of a liquid is a graduated cylinder, sometimes referred to as a measuring cylinder or mixing cylinder. Its form is slender and cylindrical. Each marked line on the graduated cylinder indicates the volume of liquid that has been measured.
The clear graduated cylinder is widely used for volume measurements and is regarded to be more accurate than a beaker since it contains permanently marked incremental graduations.
To calculate the value of graduations-
1. Subtract the two values to get the value between the labeled graduations.
2. Determine how many spaces there are between the two graduations. Keep in mind that volume equals space.
3. Divide the number of gaps by the value between the graduations.
For cylinder A.
2 ml- 1ml = 1ml
Number of spaces = 5
∴1/ 5 = 0.2
Graduation = 0.2ml
For cylinder B -
20-10 = 10
number of spaces = 5
∴10/ 5 =2
Graduation = 2ml
For cylinder C-
10-5 = 5
Number of spaces= 5
∴5/5 = 1
Graduation = 1ml
Hence , Graduations for A , B and C will be 0.2 ml, 2ml and 1ml respectively.
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Your question is incomplete. Please find the missing image below.
1. Which of these properties of an iron nail is a physic
A does not burn when a flame is applied
B. reacts with hydrochloric acid to release hydrogen gas
C. composed of only one piece instead of fragments
D. rusts
Answer:
.
Explanation:
Complete the chemical combustion reaction of naphthalene, which demonstrates the conservation of mass.
The complete combustion reaction of the naphthalene is that Naphthalene+ oxygen → carbondioxide + water + energy
What is the complete combustion reaction of the naphthalene?The complete combustion reaction of the naphthalene is given below;
Naphthalene+ oxygen → carbondioxide + water + energy
This reaction takes place and the reason behind this is that the naphthalene combustion involves a simple burning reaction in which the simple burning procedures are present.
Naphthalene also with oxygen will burn and in the result of which carbon dioxide and water will produce.
So we can conclude that the complete combustion reaction of the naphthalene is that Naphthalene+ oxygen → carbondioxide + water + energy.
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Which of the following is a statement of ideas meant to explain forensic evidence?
Observation
Hypothesis
Theory
Law
A compound containing carbon, hydrogen, and nitrogen used in rocket fuels. When burned in an excess of oxygen, a 0. 312 g sample yields 0. 458 g co2 and 0. 374 g h2o. In a separate experiment, the nitrogen content of a 0. 486 g sample is converted to 0. 226 g n2. What is the empirical formula of the compound?.
The empirical formula of the compound is CH₄N (N-methyl amide).
A sample of 0. 312g produces 0.458 g CO₂ and 0.374g H₂O.
The nitrogen content of a 0.486g sample is converted to 0.226g N₂.
Unknown :
The empirical formula of the compound = ?
Moles of C = 0.458g/(44g/mol) = 0.010409 mol
Mass of C = 0.010409 mol * 12
= 0.1249 g
Moles of H = (2*0.374g)/(44g/mol) = 0.0415 mol
Mass of H = 0.0416g
Mass of N in sample = 0.312g - (0.1249g + 0.0415g)
= 0.1456g
Moles of N = 0.1456g/ (14g/mol) = 0.0104 mol
Moles of C : H : N = 0.0104 : 0.0415 : 0.0104
= 1 : 4 : 1
So, the empirical formula of the compound, N-methyl amide is CH₄N.
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What is the density of a metal block has a mass of 270 grams and has a length of 5 cm, width of 8 cm, and height of 2 cm
(ch3)3coh draw the molecule on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars. Online
This molecule is called tert-butyl alcohol, also known as tert-butanol and 2-methyl-2-propanol (IUPAC nomenclature).
All carbon atoms are [tex]sp^{3}[/tex] hybridized. The oxygen atom has the same hybridization, with two of the orbitals being taken by the nonbonding electron pairs, and two by the C-O and the O-H bond.
Tert-butanol is a commonly used polar organic solvent, with a boiling point of 83 degrees Celsius and a density of 0.775 g/mL. Because it has an unusually high freezing point (26 degrees Celsius), pure tert-butanol is often solid at room temperature.
It is colorless, but has a characteristic camphorous smell, and is very miscible with water (dry tert-butanol is usually obtained through distillation over potassium or sodium).
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When 50.0 mL of a 1.00 M solution of Fe(NO 3 ) 3 are mixed with 50.0 mL of a 1.00 M solution of NaOHa precipitate forms. How many moles of precipitate is formed? Fe(NO 3 ) 3 (aq)+3 NaOH(aq)-Fe(OH) 3 (s)+3 NaNO 3 (aq)
6.701×10²¹moles of precipitate of iron hydroxide are formed.
How to calculate number of moles ?Number of moles can be calculated using molar mass and Avogadro's number. The formula of which is,
number of moles=1/molar mass×Avogadro's constant
In the question given , by carrying out the reaction between iron nitrate and sodium hydroxide a precipitate of iron hydroxide is going to be formed.
The moles of iron hydroxide can be calculated by substituting the values in the formula,
1/89.86×6.022×10²³=6.701×10²¹ moles.
Hence,6.701×10²¹ moles of precipitate is formed.
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4. Recall that you may have seen bubbles of gas forming during the redox reaction. These bubbles are due to a side reaction between some of the aluminum wire and acid (H* ions) formed by the hydrolysis of the copper ions. Write a balanced net ionic reaction that occurs between aluminum metal and acid ions. This is a redox reaction. Which element is oxidized, which element is reduced.
The reaction is single displacement reaction you may have seen bubbles of gas forming during the redox reaction
This bubbles are due to the side reaction between leftover aluminum wire and acid (H⁺) ion formed by the hydrolysis of copper ion in this reaction single displacement reaction are seen here a single displacement reaction or single replacement reaction or exchange of reaction in which element is replaced by another in a compound and in this reaction redox reaction are seen means oxidation and reduction takes place simultaneously called redox an balanced net ionic reaction that occurs between aluminum metal and acid ions are
Al⁺ + H⁻ in that Al is oxidized and H ion is reduced element in that reaction
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How solve stiochiometry problem easily
Answer:
Balance the equation.Convert units of a given substance to moles.Using the mole ratio, calculate the moles of substance yielded by the reaction.Convert moles of wanted substance to desired units.
Which isotope, when bombarded with bismuth-209, would yield two neutrons and an isotope with atomic number 121 and mass number 299?
The Sr-92 isotope, when bombarded with bismuth-209, would yield two neutrons and an isotope with atomic number 121 and mass number 299
When it comes to nuclear research, there are always new isotopes and elements being created. The Sr-92 isotope is one of the latest discoveries, and it has the potential to change the game when it comes to nuclear power.
When this isotope is bombarded with bismuth-209, it yields two neutrons and an isotope with an atomic number of 121 and a mass number of 299. This is a huge breakthrough because it could potentially be used to create a new form of nuclear power.
There is still a lot of research that needs to be done in order to make this a reality, but the potential is there. It will be interesting to see how this develops in the coming years.
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How many moles of retinol (c20h30o), a form of vitamin a, are in a 0.125g sample of retinol?
Moles = mass / molar mass
molar mass of retinol is 286.459 g/mol.
moles = 0.125/ 286.459
moles = 0.00043
What is Molar mass?A chemical compound's molar mass is calculated by dividing its mass by the amount of the compound present in the sample, which is given as the number of moles in the sample and measured in moles. A substance's molar mass is a bulk characteristic rather than a molecular one. The molar mass of the substance is an average over many samples, which frequently have varying values due to isotopes. The molar mass is most usually estimated using the standard atomic weights and is a function of the relative abundance of the isotopes of the constituent elements on Earth.
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Answer: 4.36x10^-4 mol
Explanation:
One example of a chemical reaction is when H20 (water) melts and changes its state from ice to liquid.
When water (H₂O) melts and changes its state from ice to liquid is not a example of chemical reaction .it a example of physical change.
A chemical reaction is defined as when one or more substances (reactants) form a new substances ( product ).
When ice melts and changes to water , there will be no new substances is form. water is made up of H₂O and ice is also made up of H₂O. its just a change in the state , solid to liquid. Physical change are the change in which only physical properties of matter changes and no new substances is formed. so, in case of ice to liquid only the change in physical properties changes and physical change is a temporary change . we can turn water to ice by freezing.
Thus, When water (H₂O) melts and changes its state from ice to liquid is not a example of chemical reaction .it a example of physical change.
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Darlene had given the guy at the recycling place four hundred aluminum cans with a mass of 53.96 grams each. How many moles of aluminum are in each can? How many molecules of aluminum did Darlene give the recycling guy altogether?
1mol=mass in grams of any element
1mol=6.02 x 10^23 things
1. The number of mole of aluminum in each can is 2 moles
2. The number of molecules of aluminum that Darlene gave to the recycling guy altogether is 4.816×10²⁶ molecules
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
1. How to determine the mole in each can of aluminumMass of one Al can = 53.96 gMolar mass of Al = 27 g/mol Mole of one Al can =?Mole = mass / molar mass
Mole of one Al can = 53.96 / 27
Mole of one Al can = 2 moles
2. How to determine the number of moleculeNumber of Al cans = 400Mole of one Al can = 2 molesTotal mole = 2 × 400 = 800 molesNumber of molecules =?From Avogadro's hypothesis,
1 mole of Al = 6.02×10²³ molecules
Therefore,
800 moles of Al = 800 × 6.02×10²³
800 moles of Al = 4.816×10²⁶ molecules
Thus, Darlene gave to the recycling guy a total of 4.816×10²⁶ molecules
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15. If the density of magnesium is 1.7 g/cm³, how many grams would be needed to fill a container that
has a volume of 25 cm³? You must show your work using dimensional analysis.
which two elements are most simiar?
A. Fe and Co
B. Li and F
C. Cu and Ag
D. H and O
I think it should be C. Cu and Ag since they are both in the same group of the periodic table, meaning that they have similar properties.
Question 6 of 25
Which phrase best describes a car that has negative acceleration?
A. The car is slowing down.
B. The car is moving fast.
C. The car is moving slowly.
Answer:
C. the car is moving slowly
During winter in new york, the lower the temperature drops, the higher the demand for energy. this is an example of _________.
During winter in new york, the lower the temperature drops, the higher the demand for energy. this is an example of a negative relationship.
An inverse correlation that favors one partner at the expense of the other is referred to as a negative relationship. This may resemble codependency or other dysfunctional dynamics in which the needs of one spouse are not satisfied or even taken into account. Loss of trust, poor communication, lack of respect, a difference in priorities, and a lack of intimacy are the primary causes of negative relationships.
People who are in negative relationships are more likely to show signs of diminished confidence and self-worth. Additionally, it causes more self-doubt, helplessness, fear, worry, melancholy, insecurity, and paranoia, which lowers professional motivation and productivity.
Lower rates of anxiety and despair, more self-esteem, more empathy, and closer relationships are all examples of correlations that have been demonstrated in negative relationships. Your immune system can be boosted by having healthy connections, and they can also aid in your recovery from illness.
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