What is a physical property of water?
A) liquid at room temperature
B) not flammable
C) pH of 7
D) reacts with sodium
A piece of copper at 10 °C is dropped into a glass of water at 35 °C. Which statement is correct?
A. Heat will flow from the copper to the water in the glass until both reach the same temperature.
B. Heat will flow from the water in the glass to the copper until both reach the same temperature.
C. The final temperature of the water in the glass and the copper will be 10 °C.
D. The final temperature of the water in the glass and the copper will be 35 °C.
Answer:
The correct answer is option B, that is, heat will flow from the water in the glass to the copper until both reach the same temperature.
Explanation:
Let us see a perfectly thermal insulation system with a glass of water at higher temperatures and a piece of copper at a lower temperature, and when both encounters each other than water will lose some of the heat and that heat will be gained by the copper. The procedure will take place until and unless both attain a similar temperature. After attaining a similar temperature, there will be no change in temperature or heat between the two. The change in heat is a function of temperature difference.
A (n) blank is a vent or fissure in the earths surface through which magma and gases are expelled
Answer:
Volcanoes
Explanation:
The volcanoes are the features on the earth's surface through which the magma comes out along with other gases.
The formation of the volcano is associated with the divergent and the convergent type of plate boundary. Due to this motion and subduction of heavier plates, the plates at greater depth melts and mixes up with the uprising magma. This magma then rises up towards the surface in the over-riding plate, forming volcanoes, from where the magma erupts on the surface forming lava along with the emission of various gases such as carbon dioxide, sulfuric acid, and hydrogen sulfate.
When an electron moves to another orbital farther from the nucleus, does it gain or lose energy?
As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato. Why did the iodine solution change color on the potato? A. The iodine evaporated into a gas. B. The iodine mixed with the colors of the potato so it looked black. C. The iodine burned the potato and turned it to ash. D. The iodine reacted with the potato to form a new substance.
Answer:
The iodine reacted with the potato to form a new substance.
Explanation:
Which of the following is an example of a population?
Question 7 options:
all of the western diamondback rattlesnakes in Big Bend National Park
all plants and animals in Grand Canyon National Park
all leopard frogs in the world
all of the trees in Yellowstone National Park
In biology, a population is made up of all individuals of a specific species within a certain area. Thus, the example that best fits this definition is all of the western diamondback rattlesnakes in Big Bend National Park.
Explanation:In biology, a population consists of all the individuals of a certain species living within a specific area. Therefore, the best example of a population among the options provided is all of the western diamondback rattlesnakes in Big Bend National Park. This is because this group contains only one species (western diamondback rattlesnakes) and is limited to a specific area (Big Bend National Park).
Alternatively, the other options contain either multiple specie (all plants and animals in Grand Canyon National Park and all of the trees in Yellowstone National Park) or include a species that is not confined to a specific area or region (all leopard frogs in the world).
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how many liters of laughing gas are in 0.98 moles stp
3H2 + N2 ===> 2NH3
GIVEN: 44.8 L of H2 at STP.
answer: mols of N2.
By applying ideal gas equation,
[tex]P\times V=n\times R\times T[\tex]
Where, P= pressure of gas
V=volume of gas
R=Gas constant
n=Number of moles of gas
T=Temperature
At STP, each gas has a defined value of pressure, volume and temperature.
P= 1 atm
R=0.0821 L atm mol⁻¹ K⁻¹
T= 0°C or 273 K
Putting all the values in the equation will give:
[tex]1\times V=0.98\times 0.0821\times 273[\tex]
V = 22 L
So the answer is 22 L.
Carbohydrates are made up of three of the six major molecules found in living things. The general chemical formula for a carbohydrate is CH2O. Which elements combine to make a carbohydrate? Explain why the answer is correct. A. copper and colbat B. chlorine and oxigen C. carbon, helium and oxygen D. carbon, hydrogen and oxygen. Please answer ASAP
An air mass of volume 6.5 x 10 to the fifth L starts at sea level, where the pressure is 775 mm HG. It rises up a mountain where the pressure is 622 mm HG. Assuming no change in temperature, what is the volume of the air mass?
How hot or cold is Mercury
How will the arrangement of salt particles most likely change?
Answer:
Salt particles will diffuse and towards where it is less that is left !!
so your answer is A !! left through diffusion !!
Explanation:
Which equation shows conservation of mass? A. H2O → H2 + O2 B. PCl5 → PCl3 + Cl2 C. Na + Cl2 → NaCl D. Al + Br2 → AlBr3
Answer:
B. PCl₅ → PCl₃ + Cl₂.
Explanation:
The conservation of mass is a phenomena that is applicable and found in chemical reaction but only balance chemical reactions.Balanced chemical reaction means that: The number of atoms of the reactants = the number of atoms in the products.In balanced chemical reaction; the atoms that enter and participate in the reaction will result from it and maintain the mass of each atom.The first choice (A) is wrong that it is unbalanced chemical reaction,H₂O → H₂ + O₂, the oxygen has 1 atom in the reactants side while has 2 atoms in the products side.
to be balanced and apply conservation of the mass it should be: H₂O → H₂ + 1/2O₂.
The second choice (B) is the right answer: PCl₅ → PCl₃ + Cl₂.The number of atoms of P (1 atom) and Cl (5 atoms) are the same in both sides of reactants and products.
The third choice (C) is wrong that it is unbalanced chemical reaction,Na + Cl₂ → NaCl, the Cl has 2 atoms in the in the reactants side while has 1 atom in the products side.
to be balanced and apply conservation of the mass it should be: Na + 1/2Cl₂ → NaCl.
The fourth choice (D) is wrong that it is unbalanced chemical reaction,Al + Br₂ → AlBr₃, the Br has 2 atoms in the in the reactants side while has 3 atoms in the products side.
to be balanced and apply conservation of the mass it should be: 2Al + 3Br₂ → 2AlBr₃.
The law of conservation of mass states that matter cannot be created nor destroyed. In chemical equations, this is demonstrated by having an equal number of atoms for each element on both sides of the equation. Thus, the balanced chemical equation PCl5 → PCl3 + Cl2 shows the conservation of mass.
Explanation:The principle of the conservation of mass is demonstrated by a balanced chemical equation, which has an equal number of each element's atoms on both sides. In the options given, the correct equation demonstrating mass conservation is PCl5 → PCl3 + Cl2. This equation rightly represents the law of conservation of mass as the number of atoms for each element is equal on both the reactant and the product side.
Out of the other options, H2O → H2 + O2 is incorrect because there is only 1 oxygen atom in the reactant side (in H2O) but 2 in the product side (in O2). Both Na + Cl2 → NaCl and Al + Br2 → AlBr3 do not conserve mass, as they don't have equal number of atoms for each element on both sides of the equation.
Remember, to show conservation of mass in a chemical reaction, the equation must be balanced, meaning it must contain equal atoms of each element on the reactant side and the product side, highlighting the fact that in any process, matter is neither created nor destroyed.
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Through which of the following processes is carbon directly transferred between living organisms and the environment?
Answer:
The answer is carbon cycle.
Explanation:
The carbon cycle is an important process for living organisms. As plants prepare their food through photosynthesis and is also an important source of fossil fuels for human activities.
Therefore carbon atoms are regenerated again and again in the carbon cycle process. This recycling process takes place between livings and nonliving things in the environment and also within the earth biosphere.
Abundance supply of carbon is necessary to carry out the biological processes. The entire carbon cycle is actually made up of sourced and sinks elements.
Both algae and amoeba are in the domain Eukarya. Which of the following characteristics do they most likely share?
They both belong to the plant kingdom.
They both have cells with no nucleus.
They both have cells with membrane-bound organelles.
They both belong to the animal kingdom.
Answer: They both have cells with membrane- bound organelles.
Explanation:
The domain eukarya includes the eukaryotic organisms, which range in diversity from single celled to multicellular. These organisms have cells that have membrane bound organelles, nucleus is present in them. These organisms range from simple to complex life cycles.
Hence, both algae and amoeba which belong to domain eukarya have membrane bound organelles in their cells.
Answer:
C, They both have cells with membrane-bound organelles.
Explanation:
I did the module exam
If the wavelength of one wave is 0.25 or ¼ meters, how many waves will be formed in one meter?
The reactant Zn is an
element
an ionic compound
a molecule
an oxide.
How many milliliters are in 22 mm3?
Properties such as luster, conductivity, and flexibility are used to describe what type of elements
Answer:
A.metals is the correct answer
HELP FAST PLZ!!!!
which statement describes the role of decomposers in the carbon cycle?
A they release the carbon that remains in the bodies of dead organisms.
B they prevent carbon from escaping into the atmosphere
C they absorb carbon dioxide in the atmosphere
D they change carbon dioxide into a form that organisms can use.
Answer:
Your answer would be A.
Explanation:
I took a quiz with the same exact question
How many moles of BaSO4 are formed if 0.5 moles of Na2 SO4 react with 60 g of BaCl2? Na2 SO4 + BaCl2 → BaSO4 + 2NaCl
Answer: 0.29
Explanation:
[tex]Na_2SO_4+BaCl_2\rightarrow BaSO_4+2NaCl[/tex]
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\textMolar mass}}[/tex]
Putting values in above equation, we get:
[tex]\text{Moles of}BaCl_2}=\frac{60g}{208g/mol}=0.29mol[/tex]
Moles of [tex]Na_2SO_4[/tex] = 0.5 moles
According to stochiometry, 1 mole of [tex]BaCl_2[/tex] reacts with 1 mole of [tex]Na_2SO_4[/tex]
Thus 0.29 moles of [tex]BaCl_2[/tex] will react with 0.29 moles of [tex]Na_2SO_4[/tex]
Thus [tex]BaCl_2[/tex] is the limiting reagent as it limits the formation of products and [tex]Na_2SO_4[/tex] is the excess reagent.
1 mole of [tex]BaCl_2[/tex] produces = 1 mole of [tex]BaSO_4[/tex]
0.29 moles of [tex]BaCl_2[/tex] will produce= 0.29 moles of [tex]BaSO_4[/tex]
Earth's path around the sun is _____.
a) eliptical
b) circular
c)random
d) triangular
An electromagnetic wave that has a lower frequency than infrared radiation will have ____ than the infrared radiation. longer wavelength and higher energy longer wavelength and lower energy shorter wavelength and higher energy shorter wavelength and lower energy
The answer is longer wavelength and lower energy.
Helpp pleaseeeeeeeee
Answer:
The Sarah will arrive at 5.00 P.M..
Explanation:
Distance covered by Sarah = D = 30 miles
Time taken by Sarah to travel 30 miles = T
Speed by which Sarah cycling = S = 10 mile/hr
[tex]Speed=\frac{Distance}{Time}[/tex]
[tex]Time = \frac{Distance}{Speed}[/tex]
[tex]T=\frac{30 mile}{10 mile/hr}=3 hr[/tex]
Sarah will reach her grandmother's house in 3 hours.
If she leaves the home at 2.00 P.M. ,then she will reach at her grandmother's house by 5.00 P.M..
What evidence do scientists have that Earth has been hit by large objects, like asteroids, in the past? Check all that apply.
HQ5.49 Use standard enthalpies of formation to calculate the standard enthalpy of reaction for the following reaction: 2 H 2 S(g) + 3 O 2 (g) → 2 H 2 O(l) + 2 SO 2 (g) ΔH ∘ rxn
The equation Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) is an example of which type of reaction?
Answer : This is an example of single-displacement reaction.
Explanation :
Single-displacement reaction : It is a type of reaction in which the more reactive metal displaces the least reactive metal from its solution.
It is represented as :
[tex]A+BC\rightarrow AC+B[/tex]
where A is the most reactive metal and BC is the compound in which the B is the least reactive metal which is displaced by the most reactive metal A.
The given balanced reaction is,
[tex]Mg(s)+2HCl(aq)\rightarrow MgCl_2(aq)+H_2(g)[/tex]
This reaction is an example of single-displacement reaction in which the magnesium metal displaces the hydrogen metal from its solution to give magnesium chloride and hydrogen gas as a product.
Hence, the given reaction is an example of single-displacement reaction.
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Which of the following is an exothermic reaction?
melting ice
dissolving ammonium nitrate in water to cool the water
dissolving sugar in water
condensation
What is the source of energy that is released in an exothermic reaction? what absorbs the energy that is released ?
Why are sound recordings needed to preserve sound information