Answer:
periods
Explanation:
In chemsitry, the horizontal columns are known as periods and the vertical columns are known as groups.
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.
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
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
Answer:
A 19g
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
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!
Some volatile organic compounds can be detected by hydrogeologists in the field or labs because of the ______ emitted from the groundwater and/or soil samples. Multiple choice question.
Volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.
What are volatile substances?Volatile substances are substances which can easily vaporize or change to gaseous state.
Volatile substances can either be solids or liquids but are mostly liquids.
Example of volatile substances include ether, petrol, chocolate.
The presence of volatile substances can be detected by the gases they release which may have characteristic odors.
Therefore, volatile organic compounds can be detected by hydrogeologists in the field or labs because of the odor of the vapors emitted from the groundwater and/or soil samples.
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what is the sun and is it enegery
What is the primary difference between a molecule and a compound?
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:
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
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.
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Classify each of the coordination compounds according to the coordination number.
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.
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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.
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
Mass of cl that could be obtained from 500kg of tubocurarine. (C37H422N2O6)
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.
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Where do electromagnetic waves move slowest?
Answer:
Solids
Explanation:
Electromagnetic waves travel fastest in empty space. But they are slowest in solids
Why is brass more suitable than copper for a key?
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.
How many moles of MgO are produced when 7. 2 moles of O2 react with excess Mg
[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.
is a Chemical change and a chemical reaction the same?
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 ^^
Two atoms of a single element that differ in number of neutrons are said to represent two distinct ________ of that element. a. isotherms b. atomic species c. isotopes d. isomers
Answer:
C
Explanation:
Isotopes are atoms of the same elements having same atomic number but different mass number
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)
Answer:
1130 j
Explanation:
4.2 j/g-C * 60 g * 4.5 C =
What happens to the molar volume when the pressure increases? molar volume increases molar volume decreases molar volume stays the same
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:
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?
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]
Define the following terms
a. crystallization
b. radical
c. mixture
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:
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?
Answer:
43.2
Explanation:
you use the charles law.
What two factors must be equal when a chemical reaction reaches equilibrium
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 energy source is composed of hydrocarbon compounds.
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
In a catalyzed reaction a reactant is often called a:.
Answer:
The reactant in an enzyme-catalyzed reaction is called a substrate.
Explanation:
. What are the benefits and consequences of using ethanol for fuel? Try to name a few of each.
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.
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?
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.
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suppose that 4.1 L of methane at a pressure of 618 Torr is transferred to a vessel of volume 2.8 L what is the final Pressure of methane if the change occurs at constant temperature? answer in units of Torr
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
Answer:
Independent of initial concentrations
Explanation:
Initial concentrations do not affect equilibrium constant because equilibrium constant is found from equilibrium concentrations.
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.
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.
Sodium and magnesium are used to displace titanium from
titanium chloride. What does this tell you about titanium?
what does the sides of a container do with a gas
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: