Answer:
a. pH = 2 b. pH = 3 c. pH = 1 d. Unanswerable
Explanation:
pH = -log[H+] OR pH = -log{H3O+]
and inversely
pOH = -log[OH-]
1. Determine what substance you are working with, (acid/base)
2. Determine whether or not that acid or base is strong or weak.
a. 1.0 x 10^-2M HCl
HCl is a strong acid, therefore it will dissociate completely into H+ and Cl- with all ions going to the H+, therefore, the concentration of HCl and concentration of H+ are going to be equal, meaning we simply take the negative logarithm of the concentration of HCl and that would equal pH
pH = -log[H+]
pH = -log(1.0x10^-2)
pH = 2
b. 1.0 x 10^-3M HNO3
HNO3 like part a, is a strong acid, therefore it would simply require you to take the negative logarithm of the concentration of the compound itself, to find its pH.
pH = -log[H+]
pH = -log(1.0 x 10^-3)
pH = 3
c. 1.0 x 10^-1M HI
Like the previous parts, HI is a strong acid
pH = -log[H+]
pH = -log(0.10)
pH = 1
d. HB isn't an element, nor is it a compound so that would be unanswerable.
How many oxygen atoms are in 3.45 mol CaCO3
Answer:
The formula tells us that each mole of CaCO3 contains 3 moles of Oxygen. Then 3 moles of CaCO3 would contain 3 X 3 or 9 moles of Oxygen. I mole is define as avogadro’s number of units. Avogadro’s number is 6.02 X 10^23. so the answer is 3 X 3 X 6.02 X 10^23. = 5.42 X 10^24
The volume and amount of aflium gas remains constant.
Under these conditions, aflium gas has an initial pressure of
635 torr when it is at 67.0°C. What is the new temperature if
the pressure drops to 250 torr?
Answer:
133.85 K
Explanation:
Initial pressure, P₁ = 635 torr
Initial temperature, T₁ = 67.0°C = 340 K
Final pressure, P₂ = 250 torr
We need to find the new temperature. The relation between temperature and pressure is given by :
[tex]\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\\\\T_2=\dfrac{P_2T_1}{P_1}\\\\T_2=\dfrac{250\times 340}{635}\\\\T_2=133.85\ K[/tex]
So, the new temperature is equal to 133.85 K.
Phosphoric acid is delivered to a drinks factory in
concentrated form. Why do you think the acid is not
diluted before transporting it?
Answer:
Because it might be reactive or may lose its property in liquid form..
With the dilution of phosphoric acid, its volume will increase. To avoid the transport cost the acid might not be diluted before transporting.
What is the food additive?
Food additives are the chemicals that are used in food products, that prevent food from spoiling due to bacterial growth.
Food additives are a kind of food preservative that is added to food products to prevent spoilage and retain their nutritional value for a long time. These additives inhibit microbial growth in food.
Different types of food additives are preservatives, nutrients, sweeteners, flavoring agents, antioxidants, and colorants.
Phosphoric acid acts as a preservative and prevents the growth of mold and bacteria in foods with sugary solutions. This increases the shelf life of that beverage and improves affordability.
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10. How many moles of glucose are in 0.5L of a 0.138M solution of glucose in
water?
Answer:
0.069 moles of glucose
Explanation:
(0.138 mol/L)(0.5 L) = 0.069 moles of glucose
Answer:
[tex]\boxed {\boxed {\sf 0.069 \ mol \ C_6H_12O_6}}[/tex]
Explanation:
Molarity is the moles per liter of a solution. It is found by dividing the moles of solute (glucose) by the liters of solution (water).
[tex]M= \frac {moles}{liters}[/tex]
We know the molarity is 0.138 M. 1 M is equal to 1 mole per liter, so we can rewrite the molarity as 0.138 moles per liter.
There are 0.5 liters of solution.
We are solving for the moles, so we can use x.
[tex]0.138 \ mol/L= \frac {x }{0.5 \ L}[/tex]
We must isolate the variable (x) to solve for the moles. It is being divided by 0.5 liters. The inverse operation of division is multiplication. Multiply both sides of the equation by 0.5 L.
[tex]0.5 \ L *0.138 \ mol/L= \frac {x }{0.5 \ L}* 0.5 \ L[/tex]
The liters on both sides cancel.
[tex]0.5 *0.138 \ mol= {x }[/tex]
[tex]0.069 \ mol =x[/tex]
[tex]0.069 \ mol \ C_6H_12O_6[/tex]
Ther are 0.069 moles of glucose in a 0.138 M solution with 0.5 liters of water.
The compound calcium carbonate contains the calcium ion (Ca2+) and the polyatomic carbonate ion (CO32-). Explain why calcium carbonate is considered to be an ionic compound when it contains both ionic and covalent bonds.
Answer:
Because of the electronegativity difference C-O (covalent) and Ca-O (ionic) bonds have.
Explanation:
Hello there!
In this case, in order to understand the polarity of this compound, calcium carbonate, it firstly necessary that it is comes from the definition of electronegativity, as a property defining the capacity to attract electrons from another atom; thus, since the electronegativities of calcium, carbon an oxygen are 1.0, 2.55 and 3.44, it is possible to realize this compound has O-Ca and O-C bonds according to its Lewis dot structure. In such a way, we calculate the difference electronegativity for these two bonds:
[tex]\Delta E_{O-Ca}=3.44-1.0 = 2.44\\\\\Delta E_{O-C}=3.44-2.55=0.89[/tex]
Thus, since 2.44 accounts for an ionic bond and 0.89 for a covalent one, we bear out the given statement in the question.
What final temperature will be attained by a 250. g sample of Cu at 20.0oC if it absorbs 1000 J of heat? Cu 's c = 0.39 J/(g oC
Answer:
30.26 °C
Explanation:
From the question,
Q = cm(t₂-t₁)................ Equation 1
Where Q = Heat, c = specific heat capacity of Cu, m = mass of Cu, t₁ = Initial temperature, t₂ = Final temperature.
Given: Q = 1000 J, c = 0.39 J/g.°C, t₁ = 20°C, m = 250 g
Substitute into equation 1 and solve for t₂
1000 = 250×0.39(t₂-20)
250×0.39(t₂-20) = 1000
97.5(t₂-20) = 1000
(t₂-20) = 1000/97.6
(t₂-20) = 10.26
t₂ = 10.26+20
t₂ = 30.26 °C
The outermost layers of the Earth are warm compared to the Earth's core.
[ ]False
[ ]True
Answer:
I am not sure this one is False.
Explanation:
Answer:
False
Explanation:
This is false because the outer part of earth is cooler than the inner. For example, the inner is filled with lava, and all kinds of stuff, so this is technically saying that the outer is much cooler, It has dirt, and dirt can be cool.
What is the specific heat of ethanol if 4650 j are required to raise the temperature of 250.0g of ethanol from 22.0oc to 29.6 degrees Celsius
Answer:
[tex]C=2.45\frac{J}{g\°C}[/tex]
Explanation:
Hello there!
In this case, since the thermodynamic definition of heat in terms of mass, specific heat and temperatures is given by:
[tex]Q=mC(T_2-T_1)[/tex]
We are to calculate the specific heat of the ethanol as shown below:
[tex]C=\frac{Q}{m(T_2-T_1)}[/tex]
Thus, by plugging it the given data we can obtain:
[tex]C=\frac{4650J}{250.0g(29.6-22.00\°C)} \\\\C=2.45\frac{J}{g\°C}[/tex]
Regards!
Fill in the blank with the molar mass of calcium
nitrate. A link to the periodic table is provided for you.
g/mol
Answer: 61.98 is correct
Explanation:
Molar mass of calcium nitrate is 164 g/mole which is obtained by adding atomic weights of constituent elements.
What is molar mass?
Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
Molar mass of calcium nitrate =40+[14+(16×3)]×2=164 g/mole.
Thus, the molar mass of calcium nitrate is 164 g/mole.
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You use 50.00 mL of a 12.0 M solution of HCl solution to make a 500.00 mL solution. What is the concentration of the new solution? *
Answer:
1.2 M
Explanation:
If you use the dilution equation (M1V1=M2V2), you end up with (50)(12)=(500)(M2), and when you solve for M2 you get 1.2 M.
Right balanced chemical equations, complete ionic equations, and net ionic equations for the reactants below. Include a description of what you did while going through your solving.
1. HgI2+PbSO4
2. Sodium carbonate and calcium react in a single replacement, one of the resulting products immediately decomposes. (you should end up with one balanced equation - 3 product)
3. CaS + Al
URGENT PLS I NEED THIS OR I WILL FAIL AND HAVE TO DO SUMMER SCHOOL
Carbon monoxide gas and oxygen gas combine to form carbon dioxide
gas in the following equation:
2CO(g) + O2(g) → 2CO2(g)
The enthalpy value for gaseous carbon monoxide is -110.5, and gaseous
carbon dioxide is -393.5, calculate the enthalpy change (AH) for the
reaction.
Answer:
ΔHr = -566kJ/mol
Explanation:
Based on Hess's law, the ΔH of a reaction is the sum of the ΔH's of products times its coefficient subtracting the ΔH of reactants. For the reaction:
2CO(g) + O2(g) → 2CO2(g)
ΔH is:
ΔHr = 2*ΔH CO2 - (2ΔH CO + ΔH O2)
As ΔH CO2 = -393.5kJ/mol; ΔH CO = -110.5kJ/mol and ΔH O2 = 0kJ/mol
ΔHr = 2*-393.5kJ/mol - (2*-110.5kJ/mol)
ΔHr = -566kJ/molhow many grams of chromium are needed to react with of cuso4 to produce 10.2g cu
Answer:
14.7 g of chromium
Explanation:
How many moles are in 3.25 x 1025 molecules of H2O?
Answer:
[tex]27.72 g[/tex]
Explanation:
The relationship between the number of particles and the number of mole of a substance is given by the equation N = n L ; where N is the number of particles, n is the number of mole, and L is Avogadro's constant.