Answer:
C) 2 H2(g) + O2 (g) 2 H2O (l) AH° = -571.6
kJ/mol
Explanation:
The magnitude of heat released in an exothermic reaction is shown by the magnitude of the change in enthalpy.
The more negative the enthalpy change of the reaction, the more the heat released by the process.
Hence, 2 H2(g) + O2 (g) 2 H2O (l) AH° = -571.6 kJ/mol has the most negative value of enthalpy change hence the greatest amount of heat is released in this reaction.
The reaction which would produce the largest amount of heat per mole of hydrogen is; Choice C: 2H2(g) + O2 (g). ===> 2 H2O (l) AH° = -571.6
AH° = -571.6kJ/mol.
According to the question;
We are required to identify the reaction which would produce the largest amount of heat per mole of hydrogen.It is evident that all the reactions are exothermic; the reactions release heat.
In essence, the reaction which produces the largest amount of heat is that with the largest negative enthalpy change, AH.In this scenario; the reaction that would produce the largest amount of heat per mole of hydrogen is Choice C: 2H2(g) + O2 (g) =====> 2 H2O (l) AH° = -571.6 kJ/mol
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What will an object moving at a constant velocity do?
come to a stop, unless it is pushed by another force
A.increase in speed
B.maintain a constant velocity until acted on by another force
C.come to a stop on its own
Answer:B
Explanation: an object in motion will stay in motion until acted on by another force and an object in rest will stay in test until acted on by another force
Plzzz help me answer this question!!,!
which is the part of an experiment that serves as the point of comparison for the results
Answer:
the observation point.
Explanation:
after the experiment, you observe the data and comparing and write out formulas for the given data.
Which of the following is an example of a chemical name using prefixes?
O A. Carbon dioxide
O B. Magnesium sulfate
O C. Iron(ll) carbonate
O D. Potassium chloride
Answer:
A
Explanation:
Fran finds a dark-colored rock that she identifies as basalt. Which property gives the rock its dark color?
O its shape
O its banding
its grain size
O its mineral content
Answer:
Mineral Content.
Explanation:
shape has nothing to do with the color displayed.
Nor does the grain size.
I don't know what banding is. Whatever it is, it is not the answer.
D: mineral content.
which common substance is an acid?
Answer:
sulfuric acid, phosphoric acid, and nitric acid, citric acid
Explanation:
What reagent is
used to test for starch
Answer:
iodine
Explanation:
In the presence of starch, iodine turns a blue/black colour. It is possible to distinguish starch from glucose (and other carbohydrates) using this iodine solution test. For example, if iodine is added to a peeled potato then it will turn black. Benedict's reagent can be used to test for glucose.
5. What could you do to convert from meters to centimeters? *
A. There is no standard way to convert these units.
B. Leave the decimal in the same position.
C. Move the decimal to the right.
D. Move the decimal to the left.
C.
centi- is essentially 10^2 of one meter.
If you had 100m, multiplying 100 by 10^2 (or 100) would give you 10000 cm.
N2(g) + 2H(g) -> N2 H4(g) What are the volumes of N2 gas and H2 gas required to form 28.5 grams of N2 H4 at 30'C and 1.50 atm?
Answer:
Volume of N₂ = 14.76 L
Volume of H₂ = 29.52 L
Explanation:
Given data:
Mass of N₂H₄ formed = 28.5 g
Pressure = 1.50 atm
Temperature = 30°C (30+273 = 303 k)
Volume of N₂ and H₂ needed = ?
Solution:
Chemical equation:
N₂ + 2H₂ → N₂H₄
Number of moles of N₂H₄ formed = mass/ molar mass
Number of moles of N₂H₄ formed = 28.5 g/ 32 g/mol
Number of moles of N₂H₄ formed = 0.89 mol
Now we will compare the moles of N₂H₄ with N₂ and H₂ form balance chemical equation.
N₂H₄ : N₂
1 : 1
0.89 : 0.89
N₂H₄ : H₂
1 : 2
0.89 : 2×0.89 = 1.78 mol
Volume of H₂:
PV = nRT
1.50 atm × V = 1.78 mol × 0.0821 atm.L/mol.K × 303 K
V = 44.28atm.L /1.50 atm
V = 29.52 L
Volume of N₂:
PV = nRT
1.50 atm × V = 0.89 mol × 0.0821 atm.L/mol.K × 303 K
V = 22.14 atm.L /1.50 atm
V = 14.76 L
What term describes the ability of something to float on water
A) density
B) buoyancy
C) magnetism
D) solubility
Answer: (B) Buoyancy
Explanation: Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy
Answer:
[tex]\boxed {\tt B. \ Buoyancy}[/tex]
Explanation:
Let's define each answer choice.
A. Density
The amount of mass in a certain spaceB. Buoyancy
The tendency of an object to float on a fluid/waterC. Magnetism
The ability of objects to product attracting or repulsing fieldsD. Solubility
The ability to dissolveThe definition that matches "the ability for something to float on water" is buoyancy. Therefore, the correct answer is B. Buoyancy
To convert measurements in the metric system you can move the decimal point left or right why does this work?
Explanation:
Because when you move the decimal point once, it it equal to 10 and to convert in the metric system, you must multiply or divide by 10. For example, when converting 4 centimeters to millimeters, you can multiply by 10 to get 40 millimeters or you can move the decimal point to the right and add another 0 to get 40.
Answer:
when you move tne decmal point it alwase ads up to ten
Explanation:
Which compound forms a powerful acid and contains a halogen
Answer:
B I already know this
Explanation:
Which sample contains the greatest number of atoms?
(a) 10.0 g He (b) 25.0 g Ne (c) 115 g Xe
Convert 840 mL to liters ( be sure to keep the appropriate number of significant figures - also, only enter a number DO NOT INCLUDE UNITS)
Atoms contain positively charged protons and negatively charged electrons. Why does an ordinary atom have no charge?
Atoms contain positively charged protons and negatively charged electrons. The atoms contain the same number of protons and electrons so the positively charged protons balance out the negatively charged electrons. Therefore, an atom is electrically neutral because it has no charge.
A scientist is studying two types of worms. Worm X has DNA identical to its parent. Worm Y has a combination of DNA from two parents. The scientist determines that one of the worms has a survival advantage over the other worm. Which statement correctly summarizes this conclusion? Worm X reproduces asexually, which gives it genetic variation. Worm Y reproduces sexually, which gives it genetic variation. Worm Y reproduces asexually, which gives it more DNA. Worm X reproduces sexually, which gives it more DNA.
Answer:
2. Worm Y reproduces sexually, which gives it genetic variation.
Answer:
B Worm Y reproduces sexually, which gives it genetic variation.
Explanation:
hope you all have a good day
For a reversible reaction, what would a large equilibrium constant indicate?
Question 5 options:
A)
At equilibrium, there will be no reactants left because they will all have been turned into products.
B)
At equilibrium, the concentration of the reactants will be much higher than the concentration of the products.
C)
At equilibrium, the concentration of the products will be about the same as the concentration of the reactants.
D)
At equilibrium, the concentration of the products will be much higher than the concentration of the reactants.
(D) At equilibrium, the concentration of the products will be much higher than the concentration of the reactants.
Which of the following could not be responsible for the acceleration of an object?
wind
gravity
density
friction
Answer:
i believe its friction
Explanation:
friction slows down objects
The skeletal structure in line-angle (line-bond) mode of 2,3,3,5-tetramethylhexane is shown. Identify the number of hydrogen atoms bound to each carbon atom in the structure.
Answer:
There are 22 hydrogen in 2,3,3,5-tetramethylhexane (C10H22)
From the left to the right of the skeletal structure:
1st Main Carbon = 3 hydrogen
2nd Main Carbon = 1 hydrogen
1st Branch Carbon = 3 hydrogen
3rd Main Carbon = 2 hydrogen
2nd Branch Carbon = 3 hydrogen
3rd Branch Carbon = 3 hydrogen
4th Main Carbon = 0 hydrogen
4th Branch Carbon = 3 hydrogen
5th Main Carbon = 1 hydrogen
6th Main Carbon = 3 hydrogen
Total = 22 hydrogen
Explanation:
This is the skeletal formula for 2,3,3,5-tetramethylhexane - the 2D chemical structure. It is an organic compound. The carbon atoms in the structure are known as the carbon backbone. The hydrogen atoms are linked to the carbon backbone. This provides each carbon atom with four bonds.
GIVING BRAINLIEST I NEED ANSWER IN LESS THAN 5 mins!
Is this a scientific model? Use complete sentences to explain why or why not.
Answer:
its a scientific model
Explanation:
It is a scientific model because it is showing the water cycle. In the water cycle it is scientifically showing how water circulates through the Earth. For example, the water in the ocean evaporates which is evaporation, then it condensates into a cloud that then becomes condensation and the condensation makes precipitation when it rains. When it falls to the ground, it then becomes a runoff down a hill.
What happens when the compound NaCI is formed
Answer:
A. Sodium transfers an electron to chlorine. Sodium forms an ion with −1 charge and chlorine forms an ion with +1 charge
Explanation:
The element with 6 valence electrons and 3 energy level is
Answer:
sulfur
Explanation:
Choose all the answers that apply. Which of the following energy forms are involved in a nuclear power plant?
1)heat
2)mechanical
3)electrical
4)nuclear
Answer:Three mutual conversions of energy forms occur at nuclear power plants: nuclear energy is converted into thermal energy, thermal energy is converted into mechanical energy, and mechanical energy is converted into electric energy.
Explanation:
Identify each of the pictures as heterogeneous or homogeneous
Answer : The image C shows homogeneous mixture and image A, B and D shows heterogeneous mixture.
Explanation :
Heterogeneous mixtures : It is a mixture in which the constituent substances are not mixed well and do not have a uniform composition throughout the mixture that means appears non-uniformly throughout the solution.
Homogeneous mixtures : It is a mixture in which the constituent substances are mixed well and have a uniform composition throughout the mixture that means appears uniformly throughout the solution.
From the given image we conclude that the,
image C shows homogeneous mixture and image A, B and D shows heterogeneous mixture.
What causes hurricanes in the northern hemisphere to roster counterclockwise ?
-ocean temperatures
-the saffir-Simpson scale
-the strength of the eyewall
-the coriolis effect
Answer: The answer is D.
Explanation:
As the air rushes toward the center, it winds up moving in a curved path thanks to the Coriolis effect. This creates a circular spinning pattern as air travels from areas of high pressure to low pressure. That's why hurricanes originating in the northern hemisphere rotate counterclockwise.
Hope this helps!
dentify the following chemical reactions as decomposition, combination/synthesis, single-displacement, double-replacement, or combustion.
(a) AgNO3(aq) + KCl(aq) → AgCl(s) + KNO3(aq)
(b) C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l)
(c) Cu(s) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 Ag(s)
(d) Cu(s) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 Ag(s)
(e) SrO(s) + SO2(g) → SrSO3(s)
Answer:
(a)Double Replacement
(b)Double Replacement
(c)Single replacement
(d)single replacement
(e) synthesis
How many steps are there in the formation of a Solar System?
O Eight
O Four
O Ten
O Six
If ur a space nerd pls help
Answer:
6 steps
Explanation:
Answer:
6
Explanation:
I looked it up on Google. Hope this is right
Most of the dissolved substance in sea water is: hydrogen chloride nitrogen sodium ANSWER NOW! I NEED HELP ASAP! WILL GIVE BRAINLIEST!
Answer: Sodium chloride
Explanation:
Ocean water contains a number of substances. When a substance which has ionic bonds is dissolved in water it takes the form of ions.
The most common ions in ocean water are sodium and chloride. These are the ions formed when common salt, sodium chloride (NaCl) is dissolved in water.
Sodium chloride accounts for about 3% of ocean water by mass.
Answer:
By far, the most abundant elements are hydrogen and water.
Explanation:
The analysis of the 77 sea water samples taken during the Challenger's 3-year voyage did much to lay the foundations for determining the chemical content of sea water. By far, the most abundant elements are hydrogen and water (combined to make water). Together, these elements make up 96% of sea water. Sodium chloride and magnesium make up just under 4% of sea water. Trace amounts of 97 other elements are found in the remaining 0.08%. Of the trace elements, calcium, potassium, sulfur, and bromine are the most abundant.
This is directly from the text.
What does Prokaryotic have that other cells does not
Answer:
Prokaryotes are unicellular organisms that lack membrane-bound structures, the most noteworthy of which is the nucleus. ... While prokaryotic cells do not have membrane-bound structures, they do have distinct cellular regions. In prokaryotic cells, DNA bundles together in a region called the nucleoid.
Use the drop-down menus to complete each sentence.
A
is an organism that eats other organisms to gain energy; it is also called
.
A
is an organism that makes its own food; it is also called
.
A
is an organism that breaks down waste and dead organisms.
Answer:
A consumer is an organism that eats other organisms to gain energy; it is also called a heterotroph.
A producer is an organism that makes its own food; it is also called an autotroph.
A decomposer is an organism that breaks down waste and dead organisms.
Explanation:
Green plants are examples of autotrophs that make their own food by photosynthesis - they don't rely on other organisms to provide them with energy.
In contrast, many organisms rely on other organisms as an energy source. These organisms are called consumers or heterotrophs. They consume producers and other consumers.
Decomposers such as some fungi, bacteria, and certain insects break down dead or decaying biological material and recycle the nutrients back into the soil.
Answer:consumer a heterotroph producer an autotroph decomposer
Explanation:
