Give reasons for the following the given statements:
a) If you throw a ball upwards, it comes down.
b) Cars will move but it is not living things.
Explanation:
a.) the ball comes back down because of the gravitational pull
b.)the car is non living because it runs on a engine (man made)
What is the counter interval and the relief of this topographic map
Answer:Individual contour lines on a topographical map are a fixed interval of elevation apart known as a contour interval. Common contour intervals are 5, 10, 20, 40, 80, or 100 feet. The actual contour interval of a map depends upon the topography being represented as well as the scale of the map.
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1. How many grams of CO2 will dissolve in 100. g water at 25.°C?
2. How many grams of CO2 will dissolve in 580. g water at 60.°C?
3. How many grams of KNO3 will dissolve in 40. grams water at 80.°C?
This problem is asking for the solubility of CO2 at both 25. °C and 60. °C in different masses of water and that of KNO3 in 40. g of water at 80 °C. At the end, the answers are 0.14 g, 0.348 g and 68. g respectively.
SolubilityIn chemistry, solubility is defined as the maximum amount of a solute one can perfectly dissolve without getting any precipitate or undissolved amount.
In this case, for CO2, one can start seeing that at 25. °C its solubility in 1000 g of water is approximately 1.4 g, which means that in 100. g it turns out to be:
[tex]\frac{1.4gCO_2*100.gH_2O}{1000gH_2O} =0.14 gCO_2[/tex]
However, at 60. °C it is approximately 0.6 g in 1000 g of water, which means that in 580. g it turns out to be:
[tex]\frac{0.6gCO_2*580.gH_2O}{1000gH_2O} =0.348gCO_2[/tex]
Finally, since the solubility of KNO3 at 80 °C is about 170 g in 100 g of water, one can see that in 40. of water it turns out to be:
[tex]\frac{170 gKNO_3*40.gH_2O}{100gH_2O} =68 gKNO_3[/tex]
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A wave has frequency of 50 waves per second (Hz) and a wavelength of 10 m. What is the speed of the wave?
Answer:
500 m/s
Explanation:
Wave Speed=Frequency x Wavelength
=50x10
=500
Which property is the basis of the purification technique recrystallization?.
Magnesium hydroxide reacts with hydrogen chloride, a double-displacement reaction occurs and produces magnesium chloride and water. If you start with 525.0mg of Magnesium hydroxide, how many atoms do you have?
Explanation:
magnesium Hydroxide + Hydrochloric react together and give us magnesium chloride + water
Write the formula of the compound formed between rubidium and sulfur?
Rubidium sulfide( Rb2S)
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What is the leaving group when converting a carboxylic acid to an ester?.
Answer:
Hydroxyl group of the carboxylic acid is destined to leave and the oxygen of the alcohol moiety stays with its hydrogen destined to leave.
Hope this helps, please let me know if I'm wrong.
A fixed mass of gass occupies a volume of 200cm at 21°c calculate it's volume at standard temperature
The calculated amount of product that should ideally be produced in a chemical reaction is called the
A) true yield
B) theoretical yield
C) actual yield
D) percent yield
Answer:
Theoretical yield
Explanation:
hope this helps :)
Answer : B) theoretical yield
percent yield = Actual yield : theoretical yield x 100%
actual yield = actual product
theoretical yield = the product that should be produced (from the calculation of the reaction coefficient)
What determines how much an air parcel will cool?
Answer: As long as the parcel is unsaturated (relative humidity < 100% or whenever the dew point temperature of the parcel less than the temperature of the parcel ), the rate of cooling is 10°C for every 1000 meters the parcel is lifted. As a rising parcel cools, its relative humidity increases.
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Explain how potassium forms an ionic compound with sulfur. Include the ions they would form and how
many ions of each element would be needed to form a neutral ionic compound.
Answer:
You need two potassium atom to form an ionic bond with one sulfur atom. Pottassium ions are formed by donating losing their electrons in the outermost shell, thr lost electrons are gained by sulphur atom to form 2K+ and S2-, respectively. The attraction between the positive ions and negative ions gives rise to the ionic bond and the molecular formula is K2S
Explanation:
A car begins at rest and rolls down a hill and reaches a velocity of 95 m/s after 10 seconds. What is the car's acceleration?
Answer:
The car has an acceleration of 9.5m/s²
Explanation:
Since:
a= change in velocity / change in time
a= 95m/s / 10s = 9.5 m/s²
Salicylamide can undergo an iodination by electrophilic aromatic substitution. Arrange the procedural steps in order to iodinate salicylamide.
The procedural steps in order to get iodinate salicylamide are as follows:
It begins first at a laboratory.Secondly, one has to dissolve salicylamide in ethanol.Then one has to add sodium iodide.Later on, one has to add sodium hypochlorite to the ice cold solution of salicylamide and sodium iodide.Thereafter one has to sodium thiosulfate.It is better to Acidify by a person adding about 10% of HCl.The one has to collect the crude product through the use of vacuum filtration.Lastly one then Recrystallize from hot ethanol.What is Electrophilic aromatic substitution?The Electrophilic aromatic substitution is known to be a kind of an organic reaction where an atom is said to be added or attached to a kind of aromatic structure (that is made up of hydrogen) is said to be replaced by an electrophile.
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What kind of animal is more likely to have taste buds for umami flavors, a carnivore or an herbivore? Explain.
A. A carnivore is more likely to have taste buds for umami flavors because herbivores do not have taste buds. Herbivores rely on their sense of smell which their brains interpret as taste and smell at once.
B. A carnivore is more likely to have taste buds for umami flavors so it can taste the flavors of meat, while a herbivore is less likely because plants do not generally have umami flavors.
C. An herbivore is more likely to have taste buds for umami flavors so it can taste the flavors of plants, while a carnivore is less likely because meats do not generally have umami flavors.
D. An herbivore is more likely to have taste buds for umami flavors because carnivores do not have taste buds. Carnivores rely on their sense of smell which their brains interpret as taste and smell at once.
it is c because canivores eat only meat while herbivores eat only plants so it is most likely a herbivore because it knows flavours that are good for it
A carnivore is more likely to have taste buds for umami flavors so it can taste the flavors of meat, while a herbivore is less likely because plants do not generally have umami flavors. Hence, option B is correct.
What is umami flavor ?One of the five fundamental flavors is umami. It has been characterized as savory and is present in cooked meats and broths. Glutamates and nucleotides, which are plentiful in meat broths and fermented foods, trigger the taste receptors that allow us to detect umami.
Meats, shellfish, fish (including fish sauce and preserved fish like maldive fish, Katsuobushi, sardines, and anchovies), tomatoes, mushrooms, hydrolyzed vegetable protein, meat extract, yeast extract, and cheeses are examples of foods with a strong umami flavor.
Carnivores are eating meat while herbivores are plant eaters. Hence, slight chance for herbivores to taste the umami flavor. Therefore, option B is correct.
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The diagram shows a food chain found in an ocean ecosystem.
Algae
Minnows
Crabs
Seagulls
Which part of the food chain receives energy last?
After understanding the food chain, we realize that how one organism is dependent upon another organism for survival. Here among the given organisms, seagulls receives the energy last. The correct option is D.
What is a food chain?A food chain refers to the order of events in an ecosystem, where one living organism eats another organism, and later that organism is consumed by another larger organism. The flow of nutrients and energy from one organism to another occurs at different trophic levels.
The food chain consists of sequential stages which are called the trophic levels. A food chain starts with the producers which utilize large amount of energy from the sun and the decomposers which are the last part needs less energy.
Decomposers get energy from dead materials. Here Seagulls comes last, so it receives less amount of energy.
Thus the correct option is D.
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What amount of moles does 60.5 L of carbon dioxide occupy at 50.5 kPa and 20 degrees C?
n = PV=RT
where
n = number of mole
p = pressure = 2.15 ATM
v = volume = 60.5L
r = 0.0821 atm (L)/ mol(K)
t = temperature = 25°+273.15=298.15 kelvin
Replacing with the values given
n = 2.15(60.5)/0.0821(298.15)=5.3 mole.
why is zinc oxide not used to investigate this property of hydrogen gas
I think zinc is not used into inverstiagte with hydrogen gas because it is non-porous in nature which causes it to have a slow reaction
Explanation:
Because Zinc is more reactive than Hydrogen
2NaOH + H2SO4 ------> 2 H2O + Na2SO4
How many grams of H2O is produced from a reaction that uses 6 moles of NaOH?
Question 2 options:
16 g H2O
4 g H2O
18.02 g H2O
108.12 g H2O
[tex]\huge\fbox{Answer ☘}[/tex]
It is given in the question that 200.0 grams of sodium hydroxide reacts with excess of sulphuric acid.
The given reaction is shown below
[tex]\bold\blue{2NAOH + H _{2}SO _{4} \: - > 2H _{2} O+ NA _{2}SO_{4} }\\ [/tex]
In this reaction, two mole of sodium hydroxide react with one mole of sulphuric acid to give two mole of water and one mole of sodium sulfate.
To determine the mass of sodium sulfate, first calculate the moles of sodium hydroxide as the value of mass is provided.
The molecular weight of NaOH is 40 g/mol.
The formula is shown below.
[tex]\pink{n = \frac{m}{ M}}\\[/tex]
Where,
✫ n is the number of moles
✫ m is the mass
✫ M is the molecular weight
To calculate the number of moles, substitute the values in the above equation.
[tex]\pink{n = \frac{200.0}{40g \: mol {}^{ - 1} } } \\ \\\pink{ ⇢n = 5}[/tex]
In the equation it is given that 2 mole of sodium hydroxide gives 1 mole of sodium sulphate.
So, to determine the actual mole of sodium sulfate divide the calculated moles of NaOH by 2.
[tex] \pink{⇢ \frac{5}{2}} \\ \\ \pink{⇢ 2.5 \: mol}[/tex]
So 2.5 mol sodium sulfate is formed from 5 mol NaOH.
The molecular weight of sodium sulfate is 142.1 g/mol.
To calculate the mass of sodium sulfate, substitute the values in the formula.
[tex] \pink{⇢2.5 = \frac{m}{142.1g \: mol {}^{ - 1} } } \\ \\\pink{ ⇢ m = 2.5 \times 142.1 }\\ \\ \pink{⇢ m = 355.25}[/tex]
Therefore, the mass of sodium sulfate formed when we start with 200.0 grams of sodium hydroxide and you have excess sulphuric acid is 355.25g.
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Name the following compounds using the Roman numeral system:
a. Fe₂(SO₄)₃
b. Cr(OH)₂
c. Hg₂(ClO₃)₂
d. Fe(ClO₄)₂
e. MnSO₄
f. Cr₂(SO₃)₃
g. Hg(IO₃)₂
h. Pb(ClO₂)₂
i. Cu(C₂H₃O₂)₂
j. Cu₂SO₄
k. CoSO₄
l. Pb₃(PO₄)₂
[tex] \qquad \qquad \huge \sf question[/tex]
Name the compound in attachment !
I have tried it myself and I think I'm correct, but my friend doesn't agree with that.
please help ~
[ Chapter : Nomenclature - Organic Chemistry ]
The IUPAC name of the given compound is 4-methylene-1,7-heptadiene
What is organic chemistry?Organic chemistry is the chemistry of carbon together with other elements such as oxygen, nitrogen, sulfur, hydrogen and phosphorus.
Organic compounds forms the core of organic chemistry.
In naming organic compounds, the IUPAC nomenclature is used.
The IUPAC name of the given compound is 4-methylene-1,7-heptadiene.
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A sample of oxygen at 40.°C occupies 820. mL. If this sample later occupies 1250 mL at 60.°C
and 1.40 atm, what was its original pressure?
[tex]\tt \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
T₁=40+273=313
T₂=60+273=333
P₁.820/313 = 1.4.1250/333
P₁=2.006 atm
Given the equation: 2H2 + O2 → 2H2O, how many moles of oxygen are needed to react with 13 moles of hydrogen
Explanation:
2H2 + O2 = 2H2O
2mol. 1mol. 2mol
2mol reacts with 1mol
13mol reacts with x
x=13mol × 1mol
2mol
x= 13mol
2mol
x= 6.5mol of oxygen
Which evidence cannot be found in spoiled foods?
a. production of gas
b. change of color
c. change of state
d. precipitate found
Answer:
a. Change of state
Explanation:
Because you will see that the state has changed
Explain the practical significance of scientists being able to estimate the products of a reaction before it is performed.
The practical significance of scientists being able to estimate the products of a reaction before it is performed is to evaluate the result without performing any experiment that requires huge capital.
Significance of estimation of productsBeing able to predict chemical reactions is an important skill for scientists which provides valuable information about the reaction such as products of the chemical reaction. This information is used to structure their presentation and results.
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aluminium can not rust why .
Answer:
Aluminium Can not rust (Can't rust also meaning Corrode)
Because it's surface is protected by aluminium Oxide which stops the metal below from coming in contact with the air (which contains Oxygen) Unlike rust, which can flake off the surface of iron and steel objects, the layer of aluminium oxide does not flake off.
Corrode
destroy or damage (metal, stone, or other materials) slowly by chemical action.
Write and balance the equation for the complete combustion of ethane, c2h6. Phase symbols and energy changes are optional.
[tex]2C_2H_6 + 7O_2[/tex] → [tex]4CO_2 + 6H_2O[/tex] is the balanced equation for the complete combustion of ethane.
What is a balanced chemical equation?The chemical equation in which the number of atoms of each element is equal in the reactant and the product of the reaction is called a balanced chemical equation.
[tex]2C_2H_6 + 7O_2[/tex] → [tex]4CO_2 + 6H_2O[/tex] is the balanced equation for the complete combustion of ethane.
Reactants contain 4 carbon atoms, 12 hydrogen atoms and 14 oxygen atoms. The same is true for products too.
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The equation for the combustion of ethane is 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O .
What is Combustion Reaction ?Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Balanced equation for the combustion of ethane :
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O .
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Why can't we make matter disappear?
No, matter never disappears as it follows the law of conservation and matter changes it form from one shape to another.
Matter is something which has both mass and shape . There are generally considered three states of matter which are solid , gas and liquid . The matter is consists of small particles known as atoms .
Matter can never disappear as it follows the law of conservation in which the chemical and physical alterations cause the matter to change in any other form but it is conserved which states that before and after the change has occurred the quantity of matter is always exactly the same .
Variations in temperature or pressure can cause all three forms of matter to change into one another as matter can change its shape .
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What is in lactic acid that it can lower pH levels?.
Answer:
On the basis of this explanation, if the rate of lactate production is high enough, the cellular proton buffering capacity can be exceeded, resulting in a decrease in cellular pH. These biochemical events have been termed lactic acidosis. ... Every time ATP is broken down to ADP and Pi, a proton is released
Explanation:
The number of protons In 200 80hg
Answer:
120
Explanation:
atomic number of Mercury is 80; therefore, each atom has 80 each of protons and electrons. The number of neutrons depends on the isotope, but for Hg-200, the number of neutrons is 200 - 80 = 120.
