Answers
Answer:
I used to know this stuff but I don't remember it anymore
Related Questions
The value of the equilibrium constant, Kc, for a reaction will be __________. Select the correct answer below: independent of temperature independent of initial concentrations an exact number will always move the reaction from left to right
Answers
Answer:
Independent of initial concentrations
Explanation:
Initial concentrations do not affect equilibrium constant because equilibrium constant is found from equilibrium concentrations.
Abuse of time and temperature can occur in each of the following ways except: The items are not cooked to the proper internal temperature The items are cooked or reheated improperly The items are held at the wrong temperature The items are held in the freezer for too long
Answers
Holding items in the freezer for too long is not an example of abuse of time and temperature.
What is abuse of time and temperature?
Abuse of time and temperature has to do with a situation in which time is used in an improper way or food is not held at the correct temperature ultimately leading to food poisoning.
Holding items in the freezer for too long is not an example of abuse of time and temperature.
Learn more about temperature: https://brainly.com/question/7510619
Which of the following can be said in the crystallization of liquid salt.
A.
Answers
Answer:
Correct option is D)
Explanation:
Crystallization is the process that is used to separate a pure solid in the form of its crystals from a solution.
Copper sulphate, salt, and potash alum can be purified by this method. In this process, the solution of the substance is heated and then cooled to form crystals.
Why must a new flu vaccine be manufactured annually?
Se*ual reproduction between flu viruses creates new strains.
The genes for the proteins on the exterior of the flu virus mutate frequently.
The flu causes mutations in the host cell DNA.
The flu virus develops methods to break down the vaccine.
Answers
Answer:
D or A
But I do know...
It's because new strains of the virus are constantly appearing and evolving, so the vaccine must change along with them.
4. Magnesium and oxygen undergo a chemical reaction to
produce magnesium oxide.
2Mg + O2 + 2MgO
If 24.4 grams of magnesium react with oxygen gas to produce
40.5 grams of magnesium oxide, what is the mass in grams of
the oxygen gas in the chemical change?
Answers
Answer:
About 16.1 grams of oxygen gas.
Explanation:
The reaction between magnesium and oxygen can be described by the equation:
[tex]\displaystyle 2\text{Mg} + \text{O$_2$} \longrightarrow 2\text{MgO}[/tex]
24.4 grams of Mg reacted with O₂ to produce 40.5 grams of MgO. We want to determine the mass of O₂ in the chemical change.
Compute using stoichiometry. From the equation, we know that two moles of MgO is produced from every one mole of O₂. Therefore, we can:
Convert grams of MgO to moles of MgO. Moles of MgO to moles of O₂And moles of O₂ to grams of O₂.The molecular weights of MgO and O₂ are 40.31 g/mol and 32.00 g/mol, respectively.
Dimensional analysis:
[tex]\displaystyle 40.5\text{ g MgO} \cdot \frac{1\text{ mol MgO}}{40.31\text{ g MgO}} \cdot \frac{1\text{ mol O$_2$}}{2\text{ mol MgO}} \cdot \frac{32.00\text{ g O$_2$}}{1\text{ mol O$_2$}} = 16.1\text{ g O$_2$}[/tex]
In conclusion, about 16.1 grams of oxygen gas was reacted.
You will obtain the same result if you compute with the 24.4 grams of Mg instead:
[tex]\displaystyle 24.4\text{ g Mg}\cdot \frac{1\text{ mol Mg}}{24.31\text{ g Mg}} \cdot \frac{1\text{ mol O$_2$}}{1\text{ mol Mg}} \cdot \frac{32.00\text{ g O$_2$}}{1\text{ mol O$_2$}} = 16.1\text{ g O$_2$}[/tex]
Sodium and magnesium are used to displace titanium from
titanium chloride. What does this tell you about titanium?
Answers
In a catalyzed reaction a reactant is often called a:.
Answers
Answer:
The reactant in an enzyme-catalyzed reaction is called a substrate.
Explanation:
What is the alveolar ventilation rate of a person that has a tidal volume of 450 ml, a dead space volume of 125 ml, and a is breathing 15 breaths/min
Answers
Answer:
Total minute ventilation is comprised of dead space plus alveolar ventilation. Minute ventilation is respiratory frequency (14 breaths per minute) multiplied by tidal volume (450 mL/breath) = 6300 mL/min.
Explanation:
hope this helps you!
what does the sides of a container do with a gas
Answers
Answer:
If a gas is heated up, its particles move around more quickly. They hit the walls of their container harder and more often.
Explanation:
I need help with this. A container holds 30.0 mL of nitrogen at 45 degree Celsius. What will be its volume if the temperature increases to 65 degree Celsius?
Answers
Answer:
43.2
Explanation:
you use the charles law.
A 25.00 mL sample of a hydrochloric acid solution was titrated to completion with 34.55 mL of 0.1020 M sodium hydroxide. What was the concentration of the hydrochloric acid
Answers
The concentration of hydrochloric acid with a volume of 25mL titrated with 34.55 mL of 0.1020 M sodium hydroxide is 0.141M.
How to calculate concentration?The concentration of an acid in a titration procedure can be calculated using the following expression:
CaVa = CbVb
Where;
Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of baseCa = ?Cb = 0.102MVa = 25mLVb = 34.55mLCa × 25 = 0.102 × 34.55
25Ca = 3.52
Ca = 0.141M
Therefore, the concentration of hydrochloric acid with a volume of 25mL titrated with 34.55 mL of 0.1020 M sodium hydroxide is 0.141M.
Learn more about concentration at: https://brainly.com/question/10725862
Define the following terms
a. crystallization
b. radical
c. mixture
Answers
a) Crystallization :- Crystallization is a chemical process in which the solid-liquid separation technique occurs. This process causes mass transfer of a solute from the liquid solution to a pure solid crystalline phase.
b) Radical :- A radical is an atom of an element or a group of atoms of different elements that behaves as a single unit with a positive or negative charge on it.
c) Mixture :- A mixture is a combination of two or more substances (elements or compounds) which is not done chemically.
Explanation:
Hope it helps you!!Answer:
(a) Crystallization is a process which helps to separate a pure solid from a solution in its crystal form. This is the in use to purify solid. For an example the salt we get from seawater can have many impurities in it. Hence, the process of crystallization is in use to remove these impurities.
(b) A radical is an atom of an element or a group of atoms of different elements that behaves as a single unit with a positive or negative charge on it.
(c) Mixtures are constituted by more than 1 kind of pure form known as substance. There are 2 types of mixture:-
(i) homogeneous
A mixture in which the constituents are uniformly distributed throughout without any clear boundary of separation
(ii) Heterogeneous
A mixture in which constituents don't have uniform composition and has a visible boundary of separation.
Explanation:
What happens to the molar volume when the pressure increases? molar volume increases molar volume decreases molar volume stays the same
Answers
Answer:
This increases our molar volume relative to an ideal gas, which results in a value of Z that is greater than 1.
Explanation:
textbook
Answer:
B. Molar volume decreases
Explanation:
Urgent!!!
Type the correct answer in the box. Express your answer to three significant figures.
The half-life of carbon-14 is 5,730 years. Dating organic material by looking for C-14 can’t be accurately done after 50,000 years.
Suppose a fossilized tree branch originally contained 4.30 grams of C-14. How much C-14 would be left after 50,000 years?
Use the formula N = N0(1/2)^t/T .
A tree branch that originally had 4.3 grams of carbon-14 will have _____ grams after 50,000 years.
Answers
Answer:
0.0102 g
Explanation:
A common formula for determining the amount of sample remaining in terms of its half-life is
where
t = 50 000 yr
Calculate n
n = 50 000/5730
n = 8.726
===============
N₀ = 4.30 g Calculate N
N = 4.30 × 2.36 × 10⁻³
N₀ = 0.0102 g
Explanation:
CORRECT THIS ANSWER
MARK A BRAIN LESS ANSWER
CARRY ON LEARNING
8.
A chain bracelet is found. It looks as though it might be made of either gold or of
copper. When the bracelet is submerged in a graduated cylinder containing water, the
volume of the water rises from 9.2 cm to 11.7 cm3. The bracelet has a mass of 45 g. Is
the bracelet made of gold or copper? (Note: The density of gold is 19.3 g/cm and the
density of copper is 8.92 g/cmº.)
Answers
Answer:
The bracelet is made of gold.
Explanation:
The bracelet displaces the water by [tex]11.7cm^3-9.2cm^3 = 2.5cm^3[/tex] and thus has a volume of [tex]2.5cm^3[/tex]. If the bracelet has a mass of 45g, we know that the density of the bracelet is then [tex]\frac{45g}{2.5cm^3}[/tex], which can be simplified to [tex]18\frac{g}{cm^3}[/tex]. This is closer to the density of gold, so it can be assumed that the bracelet is made of gold.
What two factors must be equal when a chemical reaction reaches equilibrium
Answers
Answer:
The correct answer is option 3. Equilibrium is achieved in a chemical reaction when the rate of the forward reaction is the same for the rate of the backward reaction and when the reaction has stopped.
Explanation:
. What are the benefits and consequences of using ethanol for fuel? Try to name a few of each.
Answers
Answer:
Advantages of Ethanol Fuel
Ethanol Fuel is Cost-effective Compared to Other Biofuels. ...
Ecologically Effective. ...
Helps Reduce Global warming. ...
Easily Accessible. ...
Minimizes Dependence on Fossil Fuels. ...
Contributes to Creation of Employment to the Country. ...
Opens up Untapped Agricultural Sector. ...
Ethanol Fuel is a Source of Hydrogen.
List of the Disadvantages of Ethanol
It isn't as effective a fuel as traditional gasoline. ...
It is a corrosive fuel. ...
It requires a lot of cropland space. ...
It is costly. ...
Its use has resulted in a net emissions increase. ...
It has altered food production principles. ...
It is reliant on the quality of the growing season.
is a Chemical change and a chemical reaction the same?
Answers
Answer: Heyo Kenji Here! Here's your answer- A chemical change is also called a chemical reaction. A chemical reaction is a process that occurs when one or more substances are changed into one or more new substances.
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
In a constant-pressure calorimeter, the temperature of 60. 0 g of water increases by 4. 50 °C.
What amount of heat is transferred to the water? (Specific heat capacity of water = 4. 2 J/goC)
Answers
Answer:
1130 j
Explanation:
4.2 j/g-C * 60 g * 4.5 C =
What energy source is composed of hydrocarbon compounds.
Answers
Answer:
The answer is Crude oil, natural gas, and coal.
Explanation:
Hydrocarbon are highly combustible and produce carbon dioxide, water, and heat when they are burned.
-Hope this helps!
-Justin
What is the primary difference between a molecule and a compound?
Answers
Answer:
Molecules are formed by two or more atoms that are bonded by chemical bondings. Compounds are constructed by two or more elements where the elements are mixed in fixed ratios. Not all molecules can be called compounds.
Explanation:
what is the sun and is it enegery
Answers
Why is brass more suitable than copper for a key?
Answers
Answer:
Brass does not bend as easily as copper.
Explanation:
Brass has more durability due to it having zinc in it.
Answer: Alloy strength
Explanation:
Copper and zinc atoms are different sizes. This distorts the regular lattice structure in brass, so layers of atoms cannot slide over each other so easily. This makes brass stronger than copper or zinc alone.
Mass of cl that could be obtained from 500kg of tubocurarine. (C37H422N2O6)
Answers
Based on the percentage mass of chlorine in tubocurarine, the mass of chlorine in 500 kg of tubocurarine is 52.13 kg.
What is the percentage mass of chlorine in tubocurarine?Tubocurarine chloride is the chloride salt form of tubocurarine which has the molecular formula below:
[tex]C_{37}H_{42}Cl_2N_2O_6[/tex]
The molecular mass of tubocurarine = 681 g/mol
mass of chlorine in tubocurarine = 71 g
Percentage mass of chlorine = 71/861 × 100% = 10.4%
Mass of chlorine in 500 kg of tubocurarine = 500 Kg × 10.4%
mass of chlorine in tubocurarine = 52.13 kg
Therefore, the mass of chlorine in 500 kg of tubocurarine is 52.13 kg.
Learn more about percent mass at: https://brainly.com/question/5493941
Carbonic acid, H₂CO₃ is a diprotic acid with Ka1 = 4. 3 × 10⁻⁷ and Ka2 = 5. 6 × 10⁻¹¹. What is the pH of a 0. 47 M solution of carbonic acid?
Answers
Based on the calculations, the pH of a 0.47 M solution of carbonic acid (H₂CO₃) is equal to 3.35.
How to calculate the pH of a solution?First of all, we would write a properly balanced chemical equation for these chemical reactions:
H₂CO₃(aq) ⇄ HCO₃⁻(aq) + H⁺(aq); Ka₁ = 4.3 × 10⁻⁷.
For the second chemical reaction:
HCO₃⁻(aq) ⇄ CO₃²⁻(aq) + H⁺(aq); Ka₂ = 5.6 × 10⁻¹¹.
Next, we set up an equation from the ICE table;
[HCO₃⁻] = [H⁺] = x.
[H₂CO₃] = 0.47 - x.
Ka₁ = ([HCO₃⁻] × [H⁺])/[H₂CO₃].
4.3 × 10⁻⁷ = (x × x)/(0.47 - x).
4.3 × 10⁻⁷ = x²/(0.47 - x).
x² = 0.0000002021 - 4.3 × 10⁻⁷x
x² + 4.3 × 10⁻⁷x - 0.0000002021 = 0
By solving the quadratic equation, we have:
x = [H⁺] =0.000449 M.
Now, we can determine the pH by using this formula;
pH = -log[H⁺]
pH = -log(0.000449 M).
pH = -(-3.35)
pH = 3.35.
Note: The second dissociation from Ka₂ would be so small, so it's considered negligible.
Read more on pH here: brainly.com/question/24233266
#SJP1
What is the MAXIMUM amount of the substance that will dissolve in 100 cm3 of water at 30OC?
A. 19 g
B. 30 g
C. 57 g
D. 125 g
Answers
Answer:
A 19g
Explanation:
An object that has potential energy may have this energy because of its
a acceleration
b location
c momentum
d speed
Answers
Answer:
i have no idea. let's say location because it has to be somewhere.
Explanation:
I
The picture above shows a water wave hitting the beach. Which of the following is true about this process?
A.
Neither energy nor water is transferred to the shore.
B.
As energy transfers from the water to the shore, the water travels with the energy.
C.
Water is transferred to the shore, but energy does not travel with the water.
D.
Energy is transferred from the water to the shore, but the water does not travel with the energy.
Answers
Answer:
C.
Energy is transferred from the water to the shore, but the water does not travel with the energy.
Explanation:
STUDY ISLAND TOLD ME
Classify each of the coordination compounds according to the coordination number.
Answers
Coordination number has to do with the number of ligands that is attched to the central metal atom/ion.
What is coordination number?The term coordination number has to do with the number of ligands that is attched to the central metal atom/ion. The coordination sphere contains this central metal along with associated ligands.
The question is incomplete. However, if I have something like, K3[Cr(H2O)6], the coordination number of the complex is six.
Learn mlore about coordination number: https://brainly.com/question/16236454
How many moles of MgO are produced when 7. 2 moles of O2 react with excess Mg
Answers
[tex] \frac{no {}^{2} }{1} = \frac{nmgo}{2} [/tex]
[tex]nmgo = no {}^{2} \times 2 = 7.2 \times 2 = 14.4[/tex]
Note that n stands for the number of moles.