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Elements can't be broken down, into a simplre set of properties. They are one strict unit & cannot be broken down, however they can be added together to make a compound.
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16. What part of the atom does radioactivity involve?
O Outer energy shells
Nucleus
O Entire atom
Inner energy shells
Answer:
inner energy shells are involved in radioactive activity
Answer: I think its NUCLEUS
Explanation: Good luck yall
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Determine the electronegativity difference (AEN) and the type of bond formed
(ionic, polar, non-polar).
BaCl2
Nyour answer
the electronegativity difference (AEN):
<0.5: covalent (non polar)
0.5- 1.7: covalent (polar)
> 1.7 : ionic
BaCl₂
Ba = 0.9
Cl = 3
Cl - B = 3 - 0.9 = 2.1 (ionic)
Two popular antacids tablets are tums and maalox. the active ingredient in both of these anttacids is calcium carbonate, caco3. tums regular strength tablets contain 0. 747 g and maaloz tablets contain 0. 600 g of calcium carbonate. compare the number of formula units of calcium carbonate in both tums and maalox
The number of formula units of CaCO₃ in Tums is 1.25 times the formula units in Maalox
Avogadro's hypothesis1 mole of CaCO₃ = 6.02×10²³ formula units
But
1 mole of CaCO₃ = 100 g
Thus,
100 g of CaCO₃ = 6.02×10²³ formula units
How to determine the number of formula units in both tabletsFor Tums
100 g of CaCO₃ = 6.02×10²³ formula units
Therefore,
0.747 g of CaCO₃ = (0.747 × 6.02×10²³) / 100
0.747 g of CaCO₃ = 4.50×10²¹ formula units
For Maalox
100 g of CaCO₃ = 6.02×10²³ formula units
Therefore,
0.6 g of CaCO₃ = (0.6 × 6.02×10²³) / 100
0.6 g of CaCO₃ = 3.61×10²¹ formula units
ComparisonFormula units in tums = 4.50×10²¹ formula unitsFormula units in maalox = 3.61×10²¹ formula unitsComparison =?Comparison = Tums / Maalox
Tums / Maalox = 4.50×10²¹ / 3.61×10²¹
Tums / Maalox = 1.25
Cross multiply
Tums = 1.25 × Maalox
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2S+3O2=2SO3. If 4moles of sulfur reacts with 9. 5 moles of oxygen, how many moles of oxygen would remain after the reaction?
Answer: 3.5 moles
Explanation:
For every 2 moles of sulfur consumed, there are 3 moles of oxygen consumed.
This means that sulfur is the limiting reactant, meaning that 2(3)=6 moles of oxygen will be consumed.
Thus, 9.5-6=3.5 moles of oxygen will remain.
What is [tex]K_c[/tex] for the following equilibrium concentration of each substance is :
[tex]2SO_2(g)+O_2\rightleftharpoons2SO_3(g)[/tex]
As per the question ,
[tex]2SO_2(g)+O_2\rightleftharpoons2SO_3(g) [/tex] (given)
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex]K_c = \frac{[SO_3]^2}{[SO_2]^2[O_2]}[/tex]
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex] \: \: \: \: \: = \frac{ ( 1.9)^2M^2}{(0.6)^2(0.82)M^3} [/tex]
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex] \: \: \: \: = 12.229 M^{ - 1}[/tex] (approximately)
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
Hence , K for the equilibrium is [tex]12.229M^{-1}[/tex]
The molar mass of kcl is 74.55 g/mol. if 8.45 g kcl are dissolved in 0.750 l of solution, what is the molarity of the solution? use molarity equals startfraction moles of solute over liters of solution endfraction.. 0.113 m 0.151 m 6.62 m 11.3 m
Answer: 0.151 M
Explanation:
We first need to convert the amount of KCl into moles. This is 8.45/74.55 = 0.113 moles.
So, the molarity is 0.113/0.750 = 0.151 M
How many ions are there in 13grms of K+ ions (k=39,L=6.0by10 raised to power23
Answer:
1) k2O = 2K(1+) + O(2-)This is, every molecule of K2O
Explanation:
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Name these compounds according to IUPAC.
The IUPAC names of the compound 8 is propional and compound 9 is propanone or ethyl methyl ketone.
What is IUPAC name?International Union of Pure and Applied Chemistry, IUPAC, is naming of the organic compound by the rules of chemistry.
There are some rules, like identifying the functional group, to find the longest carbon chain.
Thus, the IUPAC names of the compound 8 is propional and compound 9 is propanone or ethyl methyl ketone.
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Braconid wasps lay eggs on the tomato hornworm caterpillar's body. The larvae that hatch from the eggs start feeding on the tissue of the caterpillar. What type of ecological relationship do both the organisms share?
Answer:
Braconid wasps lay eggs on the tomato hornworm caterpillar's body. The larvae that hatch from the eggs start feeding on the tissue of the caterpillar. What type of ecological relationship do both the organisms share?
Which conclusion is supported by the information in the graph?
Timed!!! 56 minutes left!!!!
The cost of producing a kilowatt of power with a fuel cell will be less than $30 in 2015.
Fuel cell cars are unlikely to be affordable in the near future.
The rate of emissions is decreasing because of inexpensive fuel cell technology.
The environment is unlikely to improve as a result of cheap fuel cell technology.
Answer:
A. The cost of producing a kilowatt of power with fuel cell will be less than $30 in 2015
A 10.00-mL sample of HCI solution was transferred to an Erlenmeyer flask and diluted by adding about 40 mL of distilled water. Phenolphthalein indicator was added, and the solution was titrated with 0.215 M NaOH until the indicator just turned pink. The exact volume of NaOH required was 22.75 mL. Calculate the concentration of HCI in the original 10.00-mL sample.
Use Relationship between C and V
C1V1=C2V2(40-10)C1=22.75(0.215)30C1=4.9C1=4.9/30C1=0.1634Mpls help AHHHHHHHHHHHH
Answer:
1 Zn + 2 HCl ⇒ 1 H₂ + 1 ZnCl₂
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A solution of 5 m hci is already made. you need to dilute the solution to 1 m hci. the 1 m hci solution is _____
options :slower, stronger, weaker, faster ,
1M HCl solution is weaker
Which of these best describes electrolysis?
A. another name for all chemical reactions
B. a term that refers to the division of hydrogen and oxygen atoms
C. a reaction that occurs when an electric current passes through water
D. a reaction that occurs any time an electric current is introduced to a solid
Answer:
c
Explanation:
chemical decomposition produced by passing an electric current through a liquid or solution containing ions.
Which statement is true based on the diagram?
A.sulfate ions will move from right to left through the salt bridge
B.sulfate ions will move from left to right through the wire
C.sulfate ions will move from left to right through the salt bridge
D.sulfate ions will move from right to left through the wire
Sulfate ions will move from left to right through the salt bridge. The salt bridge allows the passage of ions between solutions.
What is an electrochemical cell?An electrochemical cell is a cell where electrical energy is produced as a result of chemical reactions.
We have to note that the anions tend to move from the cathode to the anode hence, sulfate ions will move from left to right through the salt bridge.
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which of the following enthalpy diagrams represent exothermic reactions? Endothermic reactions? please state which one each diagram is.
Answer:
a,c and d are exothermic
b is the endothermic
Explanation:
exothermic because energy required to form products is less than the energy required to break bonds in reactants.
endothermic because energy required to form products is larger than the energy required to break bonds in reactants.
Most lakes have rivers flowing out of them, carrying water to the ocean. However, some lakes, including the Great Salt Lake and the Dead Sea, have no outlet. Water flowing into these lakes leaves only through evaporation. Considering that the water flowing into the lakes contains many dissolved substances, how does the lack of an outlet affect the composition of these lakes? What would you expect to happen after many more years of inflow and evaporation?
The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.
What is a lake?Lake is a small stream of running water or a channel for water.
Lakes are usually a standing body of water or slow moving. This means that some lakes, including the Great Salt Lake and the Dead Sea, have no outlet.
The lack of an outlet will affect the composition of these lakes by causing an accumulation of organic and inorganic nutrients due to decomposition of living materials.
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Can someone help me with my chemistry problem?
Answer:
D. 108g of water
Explanation:
16g CH4 produces 2(18)g of H20
1g CH4 produces [tex]\frac{36}{16}[/tex]g of H2O
48g CH4 produces [tex]\frac{36}{16}[/tex]×48
108g of H20
Answer:
D. 108g of water
Explanation:
Why did the United States cut off trade and diplomatic relations with Cuba?
Answer:
It was retaliation for the nationalization of U.S. corporations property by Cuba.
Explanation:
Answer:
Cuba created a communist government and a dictatorship made by Fidel Castro. USA obviously did not approve of this so they responded by severing trade and diplomatic relations with Cuba.
Definition: The time in an age-structure diagram where the population is not yet reproducing.
Answer:
Explanation:An age-structure diagram provides a snapshot of the current population and can represent information about the past and give potential clues about future problems. When you are interpreting age-structure diagrams, it is important to compare the width of the base to the rest of the population
Diethyl ether has a δhvap of 29. 1 kj/mol and a vapor pressure of 0. 703 atm at 25. 0°c. What is its vapor pressure at 76. 0°c?
The heat of vaporization is the heat required to turn 1 gm solid into a liquid. The vapor pressure of diethyl ether at 76 degrees celsius is 1.95 atm.
What is vapor pressure?Vapour pressure is the pressure exerted by the vapors of the equilibrium system. Clausius-Clapeyron equation is used to find the vapor pressure.
[tex]\rm ln \dfrac{P_{2}}{P_{1}} = \rm \dfrac{\delta H}{R} (\dfrac{1}{T_{1}} - \dfrac{1}{T_{2}})[/tex]
Given,
Initial pressure = 0. 703 atm
Initial temperature = 298K
Final temperature = 349 K
Change in enthalpy of vaporization = 29100J/mol
Boltzman constant = 8.314 J/K mol
Substituting values above:
[tex]\begin{aligned} \rm ln \dfrac{P_{2}}{P_{1}} & = \rm \dfrac{\delta H}{R} (\dfrac{1}{T_{1}} - \dfrac{1}{T_{2}})\\\\&= \dfrac{9100}{8.314}(0.0004903)\\\\&= 0.5363\end{aligned}[/tex]
Solving further,
[tex]\begin{aligned} \rm ln \dfrac{P_{2}}{0.703} &= 0.5363\\\\& = \rm e^{0.5363}\\\\&= 1.70\end{aligned}[/tex]
The final pressure is calculated as:
[tex]\rm P_{2} = (0.703 atm)(1.70) = 1.95\;\rm atm[/tex]
Therefore, the vapor pressure at 76 degrees celsius is 1.95 atm.
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ANSWER FAST!!
An experiment requires a solution that is 80% ethyl alcohol by volume. What volume of ethyl alcohol should be added to 400 mL of water to make this solution?
Answer: 800 mL of methyl alcohol should be added to 200 ml of water to make this solution.
Explanation:
Volume of the methyl alcohol = x
Volume of water = y = 200 mL
Volume of the solution ,V = x + y
Volume percentage of solution = 80%
x = 800 mL
800 mL of methyl alcohol should be added to 200 ml of water to make this solution.
What is the function of the seed in the plant? can’t copy and paste what the internet has
Answer:
Seed is the actual medium of reproduction in plants. It could be considered as the result of gametic stage of reproduction producing the basic and fundamental prototype of the parent plant called embryo covered inside a hard protective coat I.e. testa
I read this in 6th std
What is the mass of 22.4 L of Cl2 at STP? (5 points) a 35.45 grams b 70.9 grams c 22.4 grams d 28.01 grams
Answer: 70.9 grams
Explanation:
22.4 L is about 1 mole, meaning that we need to find the mass of 1 mole of chlorine gas, which is about 70.9 grams.
Which substance is a mixture of two or more metals?.
The substance which is mixture of two or more than two metals is called as alloy. Alloy is metallic mixture of any elements.
What is alloy ?Alloy is the mixture of two or more than two metal . This mixture may be homogenous or heterogenous ,in both of the phase alloy mixture occur. It may be solid or mixture of many phases.
Alloy are classified into two parts i.e. substitutional alloy and interstitial alloy. An example of alloy is red gold which is the mixture of copper and gold. and there is mixture of silver and gold to make an alloy.
There are different types of alloy present in environment like nickel alloy, zinc alloy, bronze alloy , stainless steel alloy. I an alloy contain ferrous metal it will be rust.
Thus, Alloy is the mixture of two or more than two elements.
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what is the best definition of weight
what does doping mean ?
give an example.
[tex] \\ [/tex]
ty! ~
D∅ping is usually used in sports to refer to the act of taking substances that enhance performances.
What is d∅ping?D∅ping refers to the act of taking substances that are banned in sports.
The word is usually used with respect to sporting events. Certain substances have been found to give athletes a performance advantage over their competitors. These are referred to as d∅pes and are usually banned in most sports.
When a sportsperson takes any of these banned substances, they are said to have d∅ped.
For example, an athlete anabolic steroids before taking part in a sporting event.
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Doping = use of drugs to improve athletic performance.
Doping means taking of some drugs that enhance athletic performance. Many players use doping to enhance their performance. It is illegal, and it is banned. If any player caught doing this, he/she might be suspended for years.
Hope it help you
What does an embryo do in a seed
Answer:
The embryo, endosperm, and seed coat are the three major parts of a seed. An embryo is the young multicellular organism formed before it emerges from the seed. A seed is an embryonic plant, which stores food and is enclosed in a protective outer covering, which give rise to a new plant.
where do most of the elements on the periodic table come from?
Stars
All the elements on earth have been cooked from billions of years in stars and the released in the universe through super-nova explosions
paragraph about what has caused co2 levels to rise / will give brainliest
Answer: We may only emit about 4% of total emissions, while the natural environment emits the other 96%. But the thing is the natural environment adds and takes out CO2 from the system in roughly equal amounts (at least in the short and medium term). We only add it. We are adding so much of it that the environment can only absorb about half of it, thus the rapid increase in CO2 levels, thus the rapid increase in temperatures.
Explanation:
