Answer:
Heat or Enthalpy of reaction
This is denoted as ∆H∆H is the enthalpy the of the reaction If ∆H is positive reaction is exothermic otherwise endothermicQuestion 6 of 10
Which two reactions are faster than the others?
A. Iron metal reacts with oxygen in air to form rust.
B. Black powder in fireworks burns explosively to produce gases
and white light
c. Lead nitrate and potassium iodide react to form a yellow
precipitate.
D. Silver tarnishes in air that contains hydrogen sulfide.
Answer:The answer is B and CCC
Explanation:
Out of the given chemical changes, the two reactions which are faster are those mentioned in B and C as formation of rust and tarnishing of silver are slow reactions.
What are chemical changes?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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407 grams of al2o3 to moles?
Answer:
3.99 moles Al₂O₃
Explanation:
The molar mass (g/mol) is used to convert between grams and moles. This value is calculated by taking the individual element molar masses from the periodic table, multiplying them by the corresponding subscripts, then adding them together. Al is 26.98 g/mol and has a subscript of 2. O is 16.00 g/mol and has a subscript of 3. So, the molar mass of Al₂O₃ is 101.96 g/mol.
2(26.98 g/mol) + 3(16.00 g/mol) = 101.96 g/mol
Since it is 101.96 grams PER one mole, the 101.96 is beside grams in the ratio. When setting up the conversion, you want grams in the demoninator (molar mass ratio) to cancel out the grams in the numerator (given value). Since the given number has 3 significant figures, the answer should also have 3 significant figures.
407 grams Al₂O₃ 1 mole Al₂O₃
-------------------------- x -------------------- = 3.99 moles Al₂O₃
101.96 grams
Can animals detect radio waves
Answer:
No.
Explanation:
No organism can detect X-rays or radio waves
Answer:
no
Explanation:
Many animals, including vampire bats and certain fish and snake species, are able to sense infrared radiation, but this only goes up to wavelengths of 1mm. Longer wavelengths carry much less energy and can't be detected without some kind of resonator to amplify the signal.
2.
What is the temperature when the volume is 4L? The original temperature is 200K and the
original volume is 5L.
Answer:
160
Explanation:
p*v/t = constant
or
p1*v1/t1 = p2*v2/t2
pressure is not stated in question so we get rid of it on both sides
v1/t1 = v2/t2
we are finding temperature so we flip the entire equation
t1/v1 = t2/v2
200/5 = t2/4
4(200/5) = t2
=160
Answer:
Yes it is 160K as the first person said
The jet stream is one of the key winds that moves air masses. in which direction does the jet stream in the united state generally move air masses?
The jet stream is one of the key winds that moves air masses at the direction from west to east it moves.
What are jet streams?Jet streams are strong winds which are flow in the form of narrow bands in the upper part of the atmosphere. On the earth these winds are flows near the altitude of the tropopause. These winds carries weather systems and blows toward the colder northern air and due to the rotation of earth, its direction is from west to east.
Hence jet streams move winds from west to east direction.
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Answer: From west to east.
Explanation:
Label the equivalence point on the graph of pH versus volume of the titration of a strong acid and strong base shown below
no bots please!
a. What volume of base was needed to neutralize the acid?
b. What is the pH at the equivalence point?
c. How does the number of moles of hydronium ions and hydroxide ions compare at the
equivalence point?
Why is Seabrook Station the only nuclear power plant in New Hampshire?
A meteorite is found to contain two isotopes of element X, X-12, and X-14. Experimental analysis determined 95% of the element is isotope X-12, whereas 5% of the element is isotope X-14. What is the average atomic mass of element X?
Select one:
12.0 amu
14.0 amu
12.1 amu
13.0 amu
Considering the definition of atomic mass, isotopes and atomic mass of an element, the atomic mass of the element is 12.1 amu.
Definition of atomic massFirst of all, the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeThe same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
Definition of atomic massOn the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes.
In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Atomic mass of the element in this caseIn this case, the first isotope has an atomic mass of 12 amu and a percent natural abundance of 95 %. The second isotope has an atomic mass of 14 amu and a percent natural abundance of 5 %.
Then, the average mass can be calculated as:
12 amu×0.95 + 14 amu×0.05= 12.1 amu
Finally, the atomic mass of the element is 12.1 amu.
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Given the following equation: NaOH + HCl -> NaCl + H2O. Calculate the mass of water produced when 80.0 g of NaOH react with excess HCl.
Answer:
36 grams
Explanation:
Na 22.989
O 15.999
H 1.008 total 39.996 gm per mole
80 grams is 80 / 39.996 = ~ 2 moles
From the equation each mole of NaOH used results in ONE mole of H2O
so you will get two moles of H20
(1.008 *2 + 15.999) * 2 = ~ 36 gm
What is the temperature change if 400 J of energy is added to 10 grams of water
A) 40 degrees Celsius
B) 1 degrees Celsius
C) 100 degrees Celsius
D) 10 degrees Celsius
The temperature change if 400 J of energy is added to 10 grams of water is 9.57°C.
How to calculate temperature change?The temperature change of a calorimeter can be calculated using the following expression:
E = mc∆T
Where;
E = energy in joulesm = massc = specific heat capacity = 4.18J/g°C∆T = change in temperature400 = 10 × 4.18 × ∆T
400 = 41.8∆T
∆T = 400/41.8
∆T = 9.57°C
Therefore, the temperature change if 400 J of energy is added to 10 grams of water is 9.57°C.
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what is the Acid name for HArO3
Question 10 of 25
How many total electrons can the p orbitals hold?
O A. 2
B. 3
C. 6
D. 10
SUBM
Answer:
[tex]\huge\boxed{\sf C. \ 6}[/tex]
Explanation:
Orbitals:
Wave function that describes the location, electronic cloud and wave-like properties of an electron is called an orbital.Types:
There are 4 types of main orbitals.
s orbital (can accommodate 2 electrons)p orbital (can accommodate 6 electrons)d orbital (can accommodate 10 electrons)f orbital (can accommodate 14 electrons)[tex]\rule[225]{225}{2}[/tex]
How many molecules are in 50.000 g of aspartame?
Aspartame stands for C_14H_18N_2O_5
Molar mass:-
14(12)+18(1)+2(14)+5(16)168+18+28+80294g/molNo of moles:-
Given mass/molar mass50000/294170mol(Approx)No of molecules:
No of moles×Avagadro no170×6.022×10²³1023.7×10²³1.02×10²⁶moleculesHow many grams are there in 3.4 x 10^24 molecules of NH3?
Answer:
95.965 grams
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of NH₃, then 3.4×10²⁴ molecules are contained in how many moles of NH₃?
amount of moles of NH₃= (3.4×10²⁴ atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of NH₃= 5.645 moles
Being the molar mass of NH₃, that is, the amount of mass that a substance contains in one mole, 17 , then the amount of mass that 5.645 moles of the compound contain can be calculated as:
5.645 moles× 17= 95.965 grams
Finally, 95.965 grams of NH₃ are in 3.4×10²⁴ molecules of NH₃.
In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:
N2(g) + 3H2(g) - 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
This reaction is:
In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:
N2(g) + 3H2(g) → 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
This reaction is: Endothermic
Consider the following balanced equation:
2KCIO3 → 2KCl + 302
How many grams of O2 will be obtained by decomposing
98.1 grams of KClO3?
Оа
38.4 grams
b
17.1 grams
Ос
25.6 grams
76.8 grams
Answer:
A. 38.4 [gr].
Explanation:
all the details are provided in the attachment, the answer is marked with orange colour.
An atom that has 84 protons and 86 neutrons undergoes a reaction. At the end of the reaction, it has 82 protons and 84 neutrons. What happened to the atom? It accepted radiation in a chemical reaction. It donated neutrons to another atom in a chemical reaction. It emitted an alpha particle in a nuclear reaction. It released a beta particle in a nuclear reaction.
Answer:
C
Explanation:
It denotes a loss of 2 protons and 2 neutrons for the atom. As a result, the atom released an alpha particle, which is composed of two protons and two neutrons, hence option C is correct.
What is an alpha particle?The structure of alpha particles, also known as alpha rays or alpha radiation, is similar to that of the helium-4 nucleus and is made up of two protons and two neutrons bonded together.
They often result from the alpha decay process, although they can also result from other processes.
If an atom has 84 protons and 86 neutrons, after the reaction, the atom has 82 protons and 84 neutrons, it suggests that the atom has lost 2 protons and 2 neutrons.
Therefore, the atom emitted an alpha particle in a nuclear reaction, hence option C is correct.
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i need help ..........
Answer:
E
Explanation:
The problem with choices A B C D is that the molecular balance numbers are incorrect. E is the only one correctly balanced. For example in A is balanced as
3Mg + 2H2O ===> 3Mg0 + 2H2
The Mg's are correctly balanced.
So are the hydrogens. But take a look at the 0xygens. There are 2 on the left and 3 on the right. The equation is not balanced correctly. B and C have the same problem. One of elements is not balanced correctly.
Pumice is a volcanic rock that contains many trapped air bubbles. A 225- gram sample is occupied 236.6ml.
a. What is the density of pumice (answer is 0.951g/ml)
density of the pumice.
solution:density= mass/ volume (d= m/v)
= 225/236.6
= 0.951g/ml
so, the density of pumice is 0.951g/ml.
[tex]{\boxed{{ formula :}}} [/tex]
[tex] →\bold{Density = \frac{mass}{volume} }[/tex]
[tex]{\boxed{{ Given :}}} [/tex]
[tex]→\bold{Mass = 225 g }[/tex]
[tex]→\bold{ Volume = 236.6 ml}[/tex]
[tex]{\boxed{{ Solution :}}} [/tex]
[tex]→\bold{Density = \frac{mass}{volume} }[/tex]
[tex]→\bold{ Density = \cancel{ \frac{225 g}{236.6 ml}} = 0.951 g/ml}[/tex]
The density of pumice is 0.951 g/ ml .
If 2.00 grams of zinc are added to an excess of hydrochloric acid,
what is the volume, in liters, of hydrogen gas is produced?
Answer:
Zinc metal reacts with excess hydrochloric acid to produce hydrogen gas
Explanation: Acording to the following equation:
Zn(s) + 2HCl(aq)ZnCl2(aq) + H2(g)
The product gas, H2, is collected over water at a temperature of 20 °C and a pressure of 753 mm Hg. If the wet H2 gas formed occupies a volume of 5.39 L, the number of moles of Zn reacted was mol. The vapor pressure of water is 17.5 mm Hg at 20 °C.
Distinguish between single and double replacement reactions and give an example of
each.
Answer:
Anabolism builds complex molecules from simpler ones, while catabolism breaks large molecules into smaller ones.
Explanation:
Grace runs 6 miles in 2 hours. What is her speed?
What is the boiling point of water at standard atmospheric pressure?
Answer:
about 100 degrees Celsius
Explanation:
i dont cap
The interstitial fluid is generally poor, while the plasma is generally rich in ---------. A. Protein B. Sodium and chloride ions C. Hydrogen ions D. Carbohydrates
Answer:
B Hydrogen Ions is answer
(40) If a hypothesis is proven correct, a theory is formulated.
True or false
Answer:
In scientific reasoning, a hypothesis is constructed before any applicable research has been done. A theory, on the other hand, is supported by evidence: it's a principle formed as an attempt to explain things that have already been substantiated by data.
Explanation:
What is the most commonly preferred pH range for soil?
Group of answer choices
7.5 to 9.0
6.2 to 7.0
3.2 to 4.5
Answer:
6.2 to 7.0
Explanation:
The “ideal” soil pH is close to neutral, and neutral soils are considered to fall within a range from a slightly acidic pH of 6.2-6.5 to slightly alkaline pH of 7.0-7.5. It has been determined that most plant nutrients are optimally available to plants within this 6.5 to 7.5 pH range, plus this range of pH is generally very compatible to plant root growth.
:-befrank
What element is used to reduce ni cations in nickel ore to form metallic nickel? enter its chemical symbol.
Carbon monoxide with pressure pCO = 0.01 at 800°C is use to reduce the nickel oxide to metallic nickel.
The chemical symbol is CO.
Nickel Extraction?Nickel can be extracted from it's ore through extractive metallurgy. This entails the process of conventional roasting and reduction processes of nickel ore which will produce nickel metal which is greater than 75% purity. In stainless steel applications, 75% pure nickel can be used without been purified furthe purification which depend the components impurities of impurities present in it. Carbon monoxide is use as the reducing agent as it reduce it from nickel oxide to nickel metal.
Therefore, Carbon monoxide with pressure pCO = 0.01 at 800°C is use to reduce the nickel oxide to metallic nickel.
The chemical symbol is CO.
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How did Mesosaurus fossils get separated?
First, state your claim about how the Mesosaurus fossils got separated. Then, use evidence to support your claim. For each piece of evidence you use, explain how the evidence supports your claim. I need 2 reasoning and two pieces of evidence. help l will give you 15 points if they answer this now!
Answer: try thinking with your eyes close
Explanation:
Examine each of the following pie charts. Which one shows the correct makeup of Earth's atmosphere?
A
A
B
B
C
C
D
D
Answer:
Answer A
Explanation:
atmosphere is made up of approx 78% N and 21% O2
A subatomic particle that has almost no mass and a negative charge
Answer:
I think its the electron if this is correct can u mark me brainliest?
