Answer:
C Li + ZnCO3 Right arrow.
Explanation:
I just took the test and i got this right.
To see which reaction will happen we need to see the reactivity series of metals which shows the order of reactivity of metals, which displaces which. So option c is the correct option
What is displacement reaction?Displacement reaction is a reaction in which one atom replaces other atom from a molecule on the basis of reactivity strength. It is done by following reactivity series which states the increase order of reactivity of metals.
So in C option Li is a more reactive metal than Zn so Li can displace Zn from the Zinc carbonate Whereas in other option Platinum, Copper, Manganese are less reactive than Iron in Ferric chloride, Potassium in Potassium nitrate and calcium in Calcium oxide according to reactivity series. So In only option c, reaction will go in forward direction.
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Question 18 (Essay Worth 8 points)
(03.05 MC)
Use complete sentences to differentiate between acids and bases on the basis of taste. Give an example of each type.
Acids are sour in taste while Bases are bitter in taste . This is due to the pH that indicates acidity or basicity , and is defined as the hydrogen potential of a solution . ... Acids turn blue litmus paper into red whereas in case of Bases they turn red litmus paper into blue .
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A book is resting on a table. The mass of the book is 10 kg. The acceleration of gravity
is 9.8 m/s2. Calculate the force the book exerts on the table.
Answer:
98N
Explanation:
fg=mg
=(10)(9.8)
=98N
could someone help me with this. i am very confused.
Answer:
same tho
Explanation:
the combustion of ethane (c 2 h 6 ) is represented by the equation: 2c 2 h 6 (g) 7o 2 (g) 4co 2 (g) 6h 2 o(l) in this reaction: (a) the rate of consumption of ethane is seven times faster than the rate of consumption of oxygen. (b) the rate of formation of co 2 equals the rate of formation of water. (c) water is formed at a rate equal to two-thirds the rate of formation of co 2 . (d) the rate of consumption of oxygen equals the rate of consumption of water. (e) co 2 is formed twice as fast as ethane is consumed.
Answer:
(e) CO2 is formed twice as fast as ethane is consumed.
Explanation:
Since we have the equation of the reaction as;
2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l)
The rate of consumption of ethene = -1/2 d[C2H6]/dt
Rate of production of CO2= 1/4 d[CO2]/dt
Hence, CO2 is formed twice as fast as ethane is consumed.
4. Which of the following parts should Joseph adjust to change the objective lens from
scanner to HPO?
a. Inclination Joint
c. Stage
b. Revolving Nosepiece
d. Body Tube
Answer:
D. Body Tube
A hallow tube attached to the arm, that connects the eyepiece to the(OBJECTIVES) there are types of objectives and those are "Scanner , LPO , HPO , and OIO" and Body tube also assures continuos alignment of the optics :) I hope this helped you
A certain chemical reaction releases 31.0 kj/g of heat for each gram of reactant consumed. How can you calculate what mass of reactant will produce of heat
Answer:
See explanation.
Explanation:
Hello!
In this case, since we know the heat of reaction per gram of reactant and we should know the total energy of reaction, but it is not there, we are going to assume it is 1200 J as usual in these problems, so you can change it to whatever your given heat is.
In such a way, we set up the math as shown below:
[tex]m= 1200J*\frac{1kJ}{1000J}*\frac{1g}{31.0kJ}[/tex]
Which results:
[tex]m=0.0387g[/tex]
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name the homologous series for this compound and show its structure
ch3ch2cc(ch2)2ch3
Answer:
Alkyne
Explanation:
The homologous series for this compound is the Alkyne because of the presence of the triple bond present between the third and fourth carbon atoms as seen in the picture attached.
What is the symbol for Bromine?
Answer: Br is the answer to the question.
A giant pattern of moving water that spans whole oceans and moves water from place to place in w circle
the answer is equator
how many elements are in 4AI2(SO3)3
Answer: 3
Explanation:
A mixture contains N a H C O 3 together with unreactive components. A 1.56 g sample of the mixture reacts with H A to produce 0.561 g of C O 2 . What is the percent by mass of N a H C O 3 in the original mixture
Answer:
[tex]\% NaHCO_3=68.6\%[/tex]
Explanation:
Hello!
In this case, since a symbolic representation of the undergoing chemical reaction is:
[tex]NaHCO_3 + HA \rightarrow NaA + CO_2 + H_2O[/tex]
In such a way, since there is 1:1 mole ratio between the sodium bicarbonate (84.01 g/mol) and carbon dioxide (44.01 g/mol) we compute the mass of reactant that was used during the reaction via stoichiometry:
[tex]m_{NaHCO_3}=0.561gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molNaHCO_3}{1molCO_2}*\frac{84.01gNaHCO_3}{1molNaHCO_3}\\\\m_{NaHCO_3}=1.07gNaHCO_3[/tex]
Thus, the by-mass percent of pure sodium bicarbonate in the 1.56-g sample is:
[tex]\% NaHCO_3=\frac{1.07g}{1.56g}*100\%\\\\ \% NaHCO_3=68.6\%[/tex]
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The percent by mass of NaHCO₃ in the original mixture is 68.65%
We'll begin by calculating the mass of NaHCO₃ that reacted and the mass of CO₂ produced from the balanced equation.
NaHCO₃ + HA —> NaA + CO₂ + H₂O
Molar mass of NaHCO₃ = 23 + 1 + 12 + (16×3) = 84 g
Mass of NaHCO₃ from the balanced equation = 1 × 84 = 84 g
Molar mass of CO₂ = 12 + (16×2) = 44 g/mol
Mass of CO₂ from the balanced equation = 1 × 44 = 44 g
From the balanced equation above,
84 g of NaHCO₃ reacted to produce 44 g of CO₂
Next, we shall determine the mass of NaHCO₃ required to produce 0.561 g of CO₂From the balanced equation above,
84 g of NaHCO₃ reacted to produce 44 g of CO₂
Therefore,
X g of NaHCO₃ will react to produce 0.561 g of CO₂ i.e
[tex]X \: g \: of \: NaHCO_3 = \frac{84 \times 0.561}{44} \\ \\ X \: g \: of \: NaHCO_3 = 1.071 \: g[/tex]
Finally, we shall determine the percentage of NaHCO₃ in the original mixture.Mass of NaHCO₃ = 1.071 g
Mass of mixture = 1.56 g
Percentage of NaHCO₃ =?[tex]Percentage \: = \frac{mass}{total \: mas} \times 100 \\ \\ = \frac{1.071}{1.56} \times 100 \\ \\ [/tex]
Percentage of NaHCO₃ = 68.65%Learn more: https://brainly.com/question/18763214
Draw the Lewis structures of N2, O2, H20, and CH4. Compare your drawing to the ones in the drawing on this test and select
the answer that best describes which drawing is wrong and why. Note I drew circles
around electrons that are participating in covalent bonding. This is normally not done
but for the purpose of this test the circled electrons are fine.
A: O2 Is wrong because it shows the electrons at a 45 degree angle to the
Oxygen atoms.
B: N2 is wrong because it shows a triple bond.
C: H2O is wrong because it is missing 4 valence electrons.
D: CH4 is wrong because the bonds are supposed to be bent at 109.5 degrees.
Answer:
d
Explanation:
I need help asap please help me
Answer:
the answer is the third one the beak
True or False: Metals usually have stronger electron affinity than non-metals. True or False: Noble gas elements have a very large value for electron affinity. True or False: Negative anions have a larger ionic radius than the atomic radius of their neutral atom.
Explanation:
Metals usually have stronger electron affinity than non-metals:
In the periodic table, the trend of electron affinity is that it increases from left to right across the period and decrease down the group.
False
Noble gas elements have a very large value for electron affinity:
Electron affinity is the change in energy of an atom when an electron is added. Noble gases already have a complete octet configuration hence there is no reason to accept any electrons. This makes their electron affinity value less than or equal to zero.
False
Negative anions have a larger ionic radius than the atomic radius of their neutral atom:
Neutral atoms that gain electron are referred to as anions. The extra electron increases the electron-electron repulsion which pushes the electrons further apart and finally increased radius.
True
What is the mass of 4.42 cm3 of platinum? The density of platinum is 22.5 g/cm3. (Sig Fig rules + units)
Answer: 99.45 g
Explanation: we have 22.5 g of Platinum in every 1cm3 of Platinum so if we take 4.42 cm3 of Platinum we will have 4.42 × 22.5 g = 99.45 g of Platinum
If the average basal rate of oxygen consumption for an adult is 15 L/hour, then calculate how many hours of oxygen use will you get from the 4.7 L tank? Round your answer to 1 decimal place.
Answer:
0.3 hours of oxygen use will be obtained from the 4.7 L tank.
Explanation:
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
To solve a direct rule of three, where a, b and c are known data and x is the value to be calculated the following formula must be followed:
a ⇒ b
c ⇒ x
So [tex]x=\frac{c*b}{a}[/tex]
A value of 15 L/hour indicates that 15 L is consumed in 1 hour. The following rule of three can then be applied: if the average basal rate of oxygen consumption for an adult is 15 L in 1 hour, then 4.7 L in how long will it be consumed?
[tex]time=\frac{4.7 L*1 hour}{15 L}[/tex]
time= 0.3 hours
0.3 hours of oxygen use will be obtained from the 4.7 L tank.
The position of hydrogen is controversial in mendeleevs periodic table?
5.4 L x A mL/ B L= C mL
Answer:
A is 1000, B is 1 and C is 5,400.
Explanation:
Hello!
In this case, since we are dealing with an unit conversion from liters to milliliters, we need to keep in mind that the proper conversion factor is:
[tex]\frac{1000mL}{1L}[/tex]
Thus, the set up turns out:
[tex]5.4L*\frac{1000mL}{1L} =5,400mL[/tex]
Thus, A is 1000, B is 1 and C is 5,400.
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Match the words in the column to the appropriate blanks in the sentences.
a. negative
b. liquid
c. positive
d. solid
The phase with the greater density is___________ argon because the liquid slope of the solid/liquid equilibrium line (also called the fusion curve) is________ meaning that an increase in pressure on ___________argon will result in the formation of __________argon.
Answer:
[tex]The \ phase\ with \ the \ greater \ density \ is \ \ \mathbf{Solid } \ \ argon \ because \ the \ liquid[/tex]
[tex]slope \ of \ the \ solid/liquid \ \ equilibrium \ \ line \ (also \ called \ the \ fusion \ curve) \ is \ \ \mathbf{positive}[/tex]
[tex]meaning \ that \ an \ increase \ in \ pressure \ on \ \ \mathbf{liquid } \ \ argon \ will \ result \ in \ the[/tex]
[tex]formation \ of \ \ \mathbf{solid} \ \ argon.[/tex]
Explanation:
A phase diagram is a graphical representation with axes, representing temperature and pressure, showing the equilibrium conditions of a given substance to be a solid, liquid, or gas.
From the information given, the substance here is Argon.
So, the phase diagram of Argon can be seen in the image below.
From the diagram, it is obvious that the slope of the fusion curve is positive. Hence, the density of the solid argon will be greater than that of the liquid argon.
2.
1 point(s)
Which of the following pairs of solutions forms/form a buffer when equal volumes are mixed?
Explanation:
it should be 2:1 that is acid and base combination to the form either acid or base and its conjugate
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Explain what caused the dark-colored peppered moths to become more numerous than the light-colored peppered moths when their environment became covered in soot.
Answer:
The dark colored moths blended in while the light colored moths stand out. the light moths were hunted by predators and the black moths hid from them, making the light moths rare and the dark moths common.
Explanation:
The dark colored moths can survive easily from predators whereas, light colored moths are easily trapped by the predators due to their visibility. That's why light colored moths are rare and black colored are numerous in the environment.
What is natural selection?According to the concept of survival of the fittest those organisms which are fit to survive in the nature will live more and others will extinct. The food chain in biosphere make the balance between various organisms where higher level organisms are the fittest to survive because they consume the lower level organism for food .
Some living things have certain peculiarity that make them adapted with adverse circumstances or save them from predators. For instance, chameleons shows the camoflouge that is the ability to change its color to protect themselves.
Similarly, the black moths cannot be identified easily by predators and very hard in the dark to see them whereas light moth are visible in the night and can be easily captured by predators. That's why they are less than black moth in population.
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Lack of food, natural disasters, disease, and predation are reasons why a population might decrease in size.True or false
Answer:
true
Explanation:
Answer:
True
Explanation:
A lack of food can cause people to die to starvation. Natural disasters can wreck people's house, make them lose everything they had, and kill them or force them to move to another place. Diseases often kill hundreds of thousands of people. Predation is the same as everything else.
When dominant traits are present they cover up or hide recessive traits
True or false
Answer:
True
Explanation:
If dominant traits are there, then they take over. Periot
1 poin
12. Which scientist said that electrons exist in discrete energy levels?
A. Thomson
B. Rutherford
C. Bohr
D. Dalton
Answer:
The answer is thomson
Explanation: he is the one that said it first and then after they tried to take credit but thomson is the correct answer.
How many electrons, protons, and neutrons does copper - 67 have?
Answer:
This means Cu has 29 electrons as a neutral element. Cu-67 has 29 protons, 38 neutrons, 29 electrons.
Explanation:
Copper has 29 electrons, 29 protons, 38 neutrons.
What is Copper?
The chemical element copper (Cu) is a reddish, very ductile metal belonging to Periodic Group 11 (Ib) that has an exceptional ability to conduct heat and electricity. In nature, copper may be found in its free metallic state.
Neolithic (New Stone Age) people originally utilized this local copper (about 8000 BCE) as a replacement for stone. Around 4000 BCE, Mesopotamia saw the beginning of metallurgy when copper was cast into molds, reduced to metal from ores with fire and charcoal, and purposefully alloyed with tin to become bronze (c. 3500 BCE).
Cyprus provided the majority of the copper the Romans used. Its name, Cyprium, or "metal of Cyprus," was eventually abbreviated to cyprium and then changed to cuprum. also, see bronze.
Basaltic lavas are a common source of native copper, which may also be found reduced from copper compounds including sulfides, arsenides, chlorides, and carbonates.
Therefore, copper has 29 electrons, 29 protons, and 38 neutrons.
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Do you think climate change is a hoax or is it a scientifically valid disrupter of
ecosystems?
Answer:
it is actually valid.
Explanation:
Take a look at the arctic for example. Global warming caused a change within that climate. Icebergs are melting and predators such as polar bears are losing their food sources. They may soon go extinct.
Answer:
Climate change is a scientifically valid disrupter of exosystems. People need to do something to change their actions or we won't have a future to live in. We don't need to end emissions but completly halt all fossil fuel exploration and extraction now and completly divest from fossil fuels all together.
DO NOT COPY
If you somehow subtracted a proton from a Zirconium atom, it would be?
Answer:
Yttrium
Explanation:
If you somehow subtracted a proton from a Zirconium atom, it would become a Yttrium atom.
When the number of protons in an atom changes a new element is directly formed. The difference between one atom and the other is the based on the number of protons they contain.
Therefore, when Zirconium loses a proton, it changes to Yttrium which is the atom before Zirconium.
Such reactions as this are very common with nuclear reactions. During a nuclear reaction, the nucleus of an atom changes stability.
Determine the Density of the following objects mass= 15g volume = 2cm3
Answer:
7.5 g/cm³
Explanation:
density= mass / volume
density= 15 / 2= 7.5 g/cm³
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2) An object accelerates 2.0 m/s2 when a
force of 12.0 Newtons is applied to it.
What is the mass of the object
Show your work
Answer:
0.17 kgExplanation:
The mass of the object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{2}{12} = \frac{1}{6} \\ = 0.166666...[/tex]
We have the final answer as
0.17 kgHope this helps you
write a balenced chemical equation for the reaction: include abbreviation for the physical states-
sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas.
Answer:
2Na(s) + 2H2O(l) ------> 2NaOH(aq) + H2(g)
Explanation:
