The decomposition of limestone CaCO3 > CaO + CO2
In iron metallurgy with a blast furnace, the non-redox reaction is the decomposition of limestone (calcium carbonate), which forms calcium oxide and releases carbon dioxide.
Explanation:In the processing of iron in a blast furnace with various stages, most of the reactions are indeed redox ones, where reduction of iron ores happen. However, one of the equations that is not a redox reaction is the thermal decomposition of limestone, an impure form of calcium carbonate (CaCO3). This is done to remove unwanted impurities, forming calcium oxide (CaO) and releasing carbon dioxide (CO2). The equation for this reaction is CaCO3(s) → CaO(s) + CO2(g). Here, there's no transfer of electrons indicating that it's not a redox reaction.
Learn more about Non-Redox Reaction in Iron Extraction here:https://brainly.com/question/34432569
#SPJ6
Which indicator most likely suggests that a chemical change is taking place? 1)change in size 2)change of color 3)change of state 4)change in shape
Out of the options, the best indicator is a color change since it is the only one that can't really be blamed on a physical change. you will eventually notice that during qualitative labs and some quantitative labs, usually the thing that you are looking for is either color change or the production of a precipitate to indicate the presence of a chemical reaction
The correct answer is 2) change of color
Explanation:
A chemical change occurs when a new substance is formed or the original substance changes its identity and composition due to a chemical reaction. This is the opposite of a physical change that modifies only physical properties such as state or shape. Moreover, a chemical reaction can be identified because if often leads to a change in color, odor, the formation of bubbles or temperature change. This implies the only one that suggests a chemical change is a change of color because this occurs if the composition of a substance or substances change.
Which is a characteristic of glacial movement?
A. The zone of wastage is at the top of the glacier.
B. Movement depends on the balance between accumulation and wastage.
C. New snowfall accumulates in a zone at the bottom of the glacier.
Answer:
(B) Movement depends on the balance between accumulation and wastage.
Explanation:
A Glacier is accumulation of snow over a particular region over many years. It is balanced by zone of accumulation and zone of wastage. The zone of accumulation is the top of the glacier where the snow or ice accumulates whereas the zone of wastage is the bottom region of the glacier which melts slowly over time. A glacier sustains if the zone of accumulation is greater than the zone of wastage.
Glacial movement is determined by the balance between accumulation and wastage.
Explanation:Glacial movement is characterized by the balance between accumulation and wastage. The movement of a glacier depends on the amount of snow and ice being added through accumulation compared to the amount being lost through wastage. New snowfall accumulates zone of accumulation at the top of the glacier, while the zone of wastage is at the bottom where ice melts and breaks off. Therefore, the correct option is B. Movement depends on the balance between accumulation and wastage.
Learn more about Glacial movement here:https://brainly.com/question/33448786
#SPJ6
How would a collapsing universe affect light emitted from clusters and superclusters? A. Light would acquire a blueshift. B. Light wouldn't be affected. C. Light would acquire a redshift. D. Light can't be measured from clusters and superclusters.
Answer:
Choice A: Light would acquire a blueshift.
Explanation:
When a universe collapses, clusters of stars start to move towards each other. There are two ways to explain why light from these stars will acquire a blueshift.
Stars move toward each other; Frequency increases due to Doppler's Effect.
The time period [tex]t[/tex] of a beam of light is the same as the time between two consecutive peaks. If [tex]\lambda[/tex] is the wavelength of the beam, and both the source and observer are static, the time period [tex]T[/tex] will be the same as the time it takes for light travel the distance of one [tex]\lambda[/tex] (at the speed of light in vacuum, [tex]c[/tex]).
[tex]\displaystyle t = \frac{\lambda}{c}[/tex].
Frequency [tex]f[/tex] is the reciprocal of time period. Therefore
[tex]\displaystyle f = \frac{1}{t} = \frac{c}{\lambda}[/tex].
Light travels in vacuum at a constant speed. However, in a collapsing universe, the star that emit the light keeps moving towards the observer. Let the distance between the star and the observer be [tex]d[/tex] when the star sent the first peak.
Distance from the star when the first peak is sent: [tex]d[/tex].Time taken for the first peak to arrive: [tex]\displaystyle t_1 =\frac{d}{c}[/tex].The star will emit its second peak after a time of. Meanwhile, the distance between the star and the observer keeps decreasing. Let [tex]v[/tex] be the speed at which the star approaches the observer. The star will travel a distance of [tex]v\cdot t[/tex] before sending the second peak.
Distance from the star when the second peak is sent: [tex]d - v\cdot t[/tex].Time taken for the second peak to arrive: [tex]\displaystyle t_2 =t + \frac{d - v\cdot t}{c}[/tex].The period of the light is [tex]t[/tex] when emitted from the star. However, the period will appear to be shorter than [tex]t[/tex] for the observer. The time period will appear to be:
[tex]\begin{aligned}\displaystyle t' &= t_2 - t_1\\ &= t + \frac{d - v\cdot t}{c} - \frac{d}{c}\\&= t + (\frac{d}{c} - \frac{v\cdot t}{c}) -\frac{d}{c}\\&= t - \frac{v\cdot t}{c} \end{aligned}[/tex].
The apparent time period [tex]t'[/tex] is smaller than the initial time period, [tex]t[/tex]. Again, the frequency of a beam of light is inversely proportional to its period. A smaller time period means a higher frequency. Colors at the high-frequency end of the visible spectrum are blue and violet. The color of the beam of light will shift towards the blue end of the spectrum when observed than when emitted. In other words, a collapsing universe will cause a blueshift on light from distant stars.
The Space Fabric Shrinks; Wavelength decreases as the space is compressed.
When the universe collapses, one possibility is that clusters of stars move towards each other. Alternatively, the space fabric might shrink, which will also bring the clusters toward each other.
It takes time for light from a distant cluster to reach an observer on the ground. The space fabric keeps shrinking while the beam of light makes its way through the space. The wavelength of the beam will shrink at the same rate. The wavelength of the beam of light will be shorter by the time the beam arrives at its destination.
Colors at the short-wavelength end of the visible spectrum are blue and violet. Again, the color of the light will shift towards the blue end of the spectrum. The conclusion will be the same: a collapsing universe will cause a blueshift on light from distant stars.
Answer:
Light would acquire a blueshift.
Explanation:
Just took the test and got it right.
What can you conclude about these two reactions based on the chemical equations? Reaction A: 6CO2(g) + 6H2O(l) + sunlight → C6H12O6(aq) + 6O2(g) Reaction B: 2H2(g) + O2(g) → 2H2O(g) + energy A. Reactions A and B are both exothermic. B. Reaction A is endothermic, and reaction B is exothermic. C. Reactions A and B are both endothermic. D. Reaction A is exothermic, and reaction B is endothermic.
Answer:
The correct answer is B: reaction A is endothermic and reaction B is exothermic.
Explanation:
A: 6CO2(g) + 6H2O(l) + sunlight → C6H12O6(aq) + 6O2(g): is the photosynthesis reaction. Photosynthesis is an endothermic reaction, therefore it needs energy (sunlight) to take place.
B: 2H2(g) + O2(g) → 2H2O(g) + energy: is the formation of water. It is an exothermic reaction which releases energy as a result of the reaction.
So, the answer is option (B): Reaction A is Endothermic and Reaction B is Exothermic.
Answer: Answer: B. Reaction A is endothermic, and reaction B is exothermic
Explanation:
Endothermic reaction is a reaction that absorb energy from its surrounding.
Reaction A : 6H2O(l) + sunlight
Exothermic reaction is a reaction that releases energy to the surrounding.
Reaction B → 2H2O(g) + energy
An element is?
A solid form of a substance
A substance only with one type of atom
The smallest particle of an atom
The smallest particle of matter
Answer:
A substance only with one type of atom
Explanation:
took test
I have 0.725 liters of a 1.500m solution of cacl2. How many grams of cacl2 are in the solution
Answer:
120.7 g.
Explanation:
Molarity is defined as the no. of moles of a solute per 1.0 L of the solution.
M = (no. of moles of solute)/(V of the solution (L)).
∴ M = (mass/molar mass)of NaCl/(V of the solution (L)).
∴ mass of CaCl₂ = (M)(V of the solution (L))(molar mass) = (1.5 M)(0.725 L)(110.98 g/mol) = 120.7 g.
How many grams are present in a 5.63 liter container filled with O2 at STP?
At STP,
22.4litre Oxygen=32 g of oxygen
so 1 litre oxygen=32/22.4=1.42 g of oxygen
hence 5.63 litre oxygen=1.42×5.63=7.99 g of oxygen
5.01 moles of magnesium phosphate contain how many atoms of phosphorus?
Answer:
Explanation:
Deal with 1 mole first.
The chemical formula of Magnesium Phosphate is
Mg3(PO4)2
The 2 tells you that there are 2 mols of Phosphorus in the chemical.
1 mol of anything is 6.02 * 10^23 (in this case) atoms.
2 mols of anything is 12.04 * 10^23 atoms
2 moles of anything is 1.204 * 10^24 (the 2 answers are the same. This one is more correct in scientific notation.)
Now we come to the 5.01. Where does that go?
5.01 * Mg3(PO4)2
So multiply 1.204 * 10^24 by 5.01 When you do, you get
7.26 * 10^24 atoms
Select the characteristics that will probably yield an ionic bond. Each answer refers to two atoms, Atom X and Atom Y. Atom X is referred to first, and Atom Y is referred to second. low E.N., low E.N. high E.N., low E.N. high E.N., high E.N. low I.E., low I.E. low I.E., high I.E. high I.E., high I.E.
Answer:
low I.E., high I.E
Explanation:
Ionic or electrovalent bonds are interatomic bonds that results from the transfer of electrons between atoms. It is usually between a metal, electron donor, and non-metals which accepts electrons readily.
For an ionic bond to be formed, a large electronegativity difference is required. This suggests that one atom has a large electronegativity value while the other, the donating atom, has a low value of electronegativity. Electronegativity of an element is a property that combines the ability of its atom to lose or gain electrons. So, with respect to electronegativity, atom X would have a low electronegativity value and Y, a very high electronegativity value.
Ionization Energy(I. E) is the readiness of an atom to lose an electron. Most metals have low I.E values and would readily want to lose electrons. This satisfies X. Y in an ionic bond would have a very high I.E value and would not readily want to lose electrons but gain electrons. Y is a non-metal to a large extent.
Answer:
Low I.E of atom X and high I.E of atom Y.
Explanation:
An ionic bond is formed when two ions are formed.
In ionic bond an atom loses electron and the electron is accepted by another atom. The atom losing electron acquires positive charge and the atom gaining electron acquires negative charge.
Now to lose an electron the atom should have low ionization energy (I.E.) and the other atom must not lose electron easily (high I.E.) and should have high electron affinity.
What is the concentration of the acid in this titration 1.2 m 2.4 m 1.95 m 0.98 m 1.98 m
Answer:
1.95
Explanation:
Just did the test and it was correct!
Answer: The correct answer is 1.95 M
Explanation:
To calculate the concentration of acid, we use the equation given by neutralization reaction:
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1,M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of unknown acid which is HCl.
[tex]n_2,M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of base which is [tex]Ca(OH)_2[/tex]
We are given:
[tex]n_1=1\\M_1=?M\\V_1=(45.5-0.0)=45.5mL\\n_2=2\\M_2=1.2M\\V_2=(37.5-0.5)=37mL[/tex]
Putting values in above equation, we get:
[tex]1\times M_1\times 45.5=2\times 1.2\times 37\\\\M_1=1.95M[/tex]
Hence, the concentration of unknown HCl solution comes out to be 1.95 M.
An "arid" climate is very hot and dry.
True | False
Answer:
True
Explanation:
This is true!
Answer:
true
Precipitation (or the lack of) is the main factor that defines Arid climate. To have an Arid climate, an area must receive less than 10 inches of rain per year. However, many areas of arid climate receive far less than that. Some deserts around the world don't receive 10 inches of rain in 10 years!
How does a catalyst increase the rate of a reaction?
A) It decreases the enthalpy change of the reaction.
B) It lowers the potential energy of the reactants.
C) It provides a lower activation energy for the reaction.
D) It raises the potential energy of the products.
Answer: The answer would be C. Please give me a thanks :) bye!
Explanation:
Answer: C) It provides a lower activation energy for the reaction.
Explanation:
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.
The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.
If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?
A.It decreases.
B.It increases.
C.It stays the same.
Answer:
B. It increases.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
It is clear that, at constant P, the volume of the gas (V) is directly proportional to the temperature of the gas.
V ∝ T.
So, If a balloon is heated, the volume of the air in the balloon if the pressure is constant:
B. It increases.
which of the following would improve the experimental design of this investigation? why?
safety goggles
root vegetable, such as a large carrot or potato
two metal forks
an edge or thin wall to freely balance the vegetable on, such as a cardboard box with its flaps taped down
Stay safe! Always wear your safety goggles. Be careful while sticking the forks into the vegetable. If you’re working outside a lab, make sure the area is clean so you can save the vegetable when you’re done.
Part A
Stick a fork into each end of
How is the precision of a calculated result related to the precision of the measurement used in the calculation?
Answer:
The precision of a calculated answer is limited by the least precise measurements used in the calculation.
Explanation:
HELP
Question 1 (1 point)
Saved
In the first reaction with Epsom Salt added to ammonia, what evidence was there for a chemical reaction taking place?
Question 1 options:
color change
formation of a precipitate
increase in temperature
formation of bubbles
Question 2 (1 point)
In the second reaction with iron and oxygen, what evidence for a chemical reaction was NOT observed?
Question 2 options:
new substance formed
formation of a precipitate
color change
change in temperature
Question 3 (1 point)
In the third reaction which gas is released when baking soda is added to vinegar?
Question 3 options:
carbon dioxide
hydrogen gas
water
oxygen
Question 4 (1 point)
In the fourth reaction with copper sulfate and sodium hydroxide, what is the precipitate that is formed?
Question 4 options:
Cu(OH)2
NaOH
CuSO4
Na2SO4
Answer: Question #1) The formation of a precipitate
Question # 2) ? Insufficient information
Question # 3) when you mix baking soda (sodium bicarbonate) with vinegar (acetic acid) the baking soda is the base and the vinegar is the acid, the baking soda takes a proton from the acid and the products of the reaction are H2O and CO2. The initial two products are carbonic acid and sodium acetate and the second part of the reaction is the decomposition reaction with the carbonic acid immediately decomposing into water and carbon dioxide gas. The CO2 rises to the surface creating bubbles.
Question #4) when sodium hydroxide, a strong base reacts with copper sulfate an acidic salt as a blue precipitate of copper hydroxide is produced with ions of sodium sulfate in solution. This represents a double displacement reaction as well as a precipitation reaction.
Explanation:
Copper conducts heat well.
physical
chemical
Alcohol has a sweet odor.
physical
chemical
The properties of copper conducting heat well and the sweet odor of alcohol are both physical properties. They describe the state of a physical system and do not indicate a change in the chemical composition of the substances.
Explanation:These properties you referred to are known as Physical Properties. A physical property is any property that is measurable whose value describes a state of a physical system.
The property of copper conducting heat well is a physical property. Metallic copper is highly conductive and allows for the fast transfer of thermal energy, which is a physical change, not a chemical one. It simply changes the temperature, not the chemical structure of the copper.
Similarily, the sweet odor of alcohol is also a physical property, distinct to specific alcohols, for instance, Ethanol. The odor or smell does not alter or define the chemical composition of the alcohol, thus it is not a chemical property.
Learn more about Physical Properties here:https://brainly.com/question/18327661
#SPJ3
How much energy would a jeweler need to melt 4.4 g of copper to fix a broken necklace if the copper starts out at 25°C and melts at 1083°C
Answer:
1792 J.
Explanation:
To calculate the energy would a jeweler need, we use the relation:The amount of heat released from Cu = Q = m.c.ΔT.
where, m is the mass of Cu (m = 4.4 g).
c is the specific heat capacity of Cu = 0.385 J/g°C.
ΔT is the temperature difference = (final T - initial T = 1083°C - 25°C = 1058°C).
∴ The amount of heat released from Cu = Q = m.c.ΔT = (4.4 g)(0.385 J/g°C)(1058°C) = 1792 J.
what are the names of the major groups that settled the islands of Oceania south
choose all answers that are correct.
A. South Americans
B. Filipinos
C. Aboriginals and Maori
D. Indonesians
Answer:
i think it's B, C and D
Explanation:
The reaction 2KClO3 (s) ->2KCl (s) + 3O2 (g) is a
Answer:
(C) Decomposition reaction
Explanation:
A decomposition reaction is a chemical reaction in which a single compound breaks down into two or more compounds or elements.
in this example
2KClO₃(s) ->2KCl (s) + 3O₂ (g)Potassium chlorate (KClO₃) decomposed to two smaller compounds KCl and O₂ gas.
So, the right choice is (C) Decomposition reaction
Which of the following happens during a lunar eclipse?
Select one:
a. Earth casts a shadow on the moon.
b. The moon casts a shadow on Earth.
c. Earth stops revolving in its orbit.
d. Earth starts revolving around the moon.
Answer:
a. Earth casts a shadow on the moon.
Explanation:
Lunar eclipse occurs when Earth comes in between sun and moon. The sunlight falling on moon is blocked by Earth and the shadow of earth falls on moon. This happens on full moon day when sun, earth and moon align in one line.The moon passes through the shadow of earth and appears dark.
Thus, the correct option is a.
Answer:
a
Explanation:
HELP ME PLZZZZ ASAP
Which statements describe asexual and sexual reproduction? Check all that apply.
1. Sexual reproduction always requires two parents.
2. Methods of asexual reproduction are forms of meiosis.
3. Asexual reproduction requires only one parent.
4. In sexual reproduction, offspring receives all of its DNA from one parent.
5. The offspring of sexual reproduction have the same DNA as the parent.
Answer:
1. Sexual reproduction always requires two parents.
3. Asexual reproduction requires only one parent.
Explanation:
The statement which clearly distinguish two types of reproduction is option 1. Sexual reproduction always require two parents whereas, asexual reproduction.
What is asexual reproduction ?Asexual reproduction refers to a type of reproduction where a child is born to a single parent. The newly created people are clones of their parents since they have the same genetic makeup and physical characteristics.
Both multicellular and unicellular species can reproduce asexually. There will be no gamete fusion involved in this procedure, and the number of chromosomes will remain the same.
Sexual reproduction always requires two parents. The genetic traits from both parents are inherited to the offsprings. However , not all of them can be active traits some goes hidden. Hence, option 1 is correct.
Find more on inheritance:
https://brainly.com/question/14930526
SPJ6
The pressure exerted on a sample of gas is 735 mm Hg with a volume of 375 mL and a temperature of 25 degrees Celsius. What would the pressure of the gas be if the temperature was reduced to standard temperature and the volume was expanded to 500.0 mL?
Answer:
= 498.13 mmHg
Explanation:
Using the combined gas law;
P1V1/T1 =P2V2/T2
in this case; P1 = 725 mmHg, V1 = 375 mL and T1 = 25°C + 273 = 298 K
P2 = ? V2 = 500 mL and T2 = 0°C + 273 = 273 K
P2 = P1V1T2/T1V2
= (725 × 375 × 273)/(298 × 500)
= 498.13 mmHg
Convert a pressure of 1.75 atm to kPa and to mm Hg
Answer:
Explanation:
1.75atm x 101.3kPa/1 atm
=177kPa
1.75 atm x 760 mmHg/1 atm
=1300 mm Hg
The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.
The correct answer is 1300mmhg
What is pressure?Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure is the pressure relative to the ambient pressure. Various units are used to express pressure.According to the question, the formula is used as
[tex]1.75* 101.3[/tex] =177kPa
1.75 * 760=1300 mm Hg
Hence, the correct answer is 1300mmhg.
For more information about the pressure refer to the link:-
https://brainly.in/question/9531558
Refrigerator technology now makes it possible to grow and then store food for the winter, as well as ship large amounts of food long distances. How has refrigerator technology changed society? A. Refrigerator technology has helped improve people’s nutrition. B. Refrigerator technology has helped people travel faster. C. Refrigerator technology has allowed people to work throughout the summer. D. Refrigerator technology has helped farmers grow more types of food.
Answer: A. Refrigerator technology has helped improve people’s nutrition.
Explanation:
Refrigeration technology has been transformative for society by enhancing food preservation, enabling long-distance transportation of fresh produce, and thereby improving overall nutrition and food variety available to people. Correct option is A.
Refrigerator technology has significantly changed society by improving how we store, transport, and consume food. With the advent of refrigeration technology, we're able to preserve the quality and nutritional value of food over longer periods and distances, helping to improve global nutrition levels. It's worth noting that refrigeration technology has also led to a greater variety of food being available to consumers, as produce can now be shipped safely across the world, and stored efficiently for later use.
The correct answer to the question of how refrigerator technology has changed society is A. Refrigerator technology has helped improve people’s nutrition.
Pick the correct answer down below
The correct answer is A I believe!
the correct answer is d)
Why does the same side of the moon always face earth? A. The rotational period of earth is the same as that of the moon B. The rotational period of earth is equal to one revolution around earth C The rotational period of the moon is equal to one revolution around earth D. The rotational period of the moon is different than one revolution around Earth
Answer:
A. the rotational period of the earth is the same as that of the moon
Explanation:
I learned about this last year
The rotational period of the moon is equal to one revolution around the earth,so that the same side of the moon always face earth. Hence the option C is correct.
What is Earth?Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers.The rotational period of the moon is equal to one revolution around the earth,so that the same side of the moon always face earth. Hence the option C is correct.
To learn more about Earth refer:https://brainly.com/question/17503026
#SPJ2
What is the reaction quotient?
A.It measures the [products] / [reactants]
B.It measures the concentration of the reactants.
C.It measures the concentration of the products.
D.It measures the [reactants] / [products]
Reset
Answer:
A. It measures the [products] / [reactants].
Explanation:
The reaction quotient aids in figuring out which direction a reaction is likely to proceed, given either the pressures or the concentrations of the reactants and the products.It is calculated from the concentration of the products and reactants at mixing up.Reaction quotient (Q) = [products] / [reactants]So, the right choice answer:
A. It measures the [products] / [reactants].
During natural selection, which organisms are most likely to survive as the environment changes?
Are there any choices to your question? If so what are they? Then I can answer. :)
Disorders, such as sickle cell anemia, are the result of mutations of theA)brain.B)chromosomes.C)heart.D)nucleolus.
Answer:
B)
Explanation:
Mutations are changing in chromosomes.