Answer:
Good luck man
Explanation:
Good luck man
What is the voltage of a galvanic cell made with zinc (Zn) and aluminum (AI)? A. 0.92 V
B. -0.92 V
c. -2.44 V
D. 2.44 V
Answer:
The correct option is (a) "0.92 V".
Explanation:
The voltage of a galvanic cell made with zinc (Zn) and aluminum (AI) is given by :
Voltage =Ered- Eoxd
Where
Ered = reduction potential
Eoxd = oxidation potential
As per reduction standard potentials, the emf of Zinc is -0.76 V and the emf of Aluminium is -1.66 V. So,
V = 0.76 - (-1.66)
= 0.9 V
Hence, the correct option is (a) "0.92 V".
Helium only has two valence electrons and is a stable atom. How is this possible when atoms
need 8 valence electron to become stable?
Answer:
Explanation:
Helium (He) is similar in that it, too, only has room for two electrons in its only valence shell. Hydrogen and helium have only one electron shell. The first shell has only one s orbital and no p orbital, so it holds only two electrons. Therefore, these elements are most stable when they have two electrons.
If an atom has 8 electrons and 8 protons and 9 neutrons then what is it's net charge?"
choices:
0
1+
1-
2-
_Ch7H16+_O2=_CO2+_H2O balancing the equation
Answer:
0,11,7,8
Explanation: hope this helps!
Which of the following factors affects the amount of heat absorbed by a substance?
A. Boiling point of the substance
B. Specific heat capacity of the substance
C. Melting point of the substance
D. Shape of the substance
Answer:
The correct answer is B, "Specific heat capacity of the substance."
Explanation:
I just took the test. I hope this helps!
Heat absorbed changes the bonds of the molecules or the compounds to alter their state. The specific heat capacity affects the amount of heat absorbed. Thus, option B is correct.
What is specific heat capacity?Specific heat capacity is defined as the amount of heat or energy absorbed by the kilogram of the solid reactant when the system experiences a rise in temperature. It is measured in J/(kg K) or J/(kg °C).
The specific heat capacity, the mass of the substance, temperature, and the phase of the substance affects the absorption of the heat from the surrounding. The specific heat affects absorption as it tells about the substance's ability to take the heat energy.
Therefore, specific heat capacity affects heat absorption.
Learn more about specific heat capacity here:
https://brainly.com/question/2530523
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In order to tell the difference between microwaves and visible light in the blue range, which of the following measurements should be made?
Answer:
microwaves should be made
Answer:
answer choices plzzzzz
ima edit my answer wht are the choices
Explanation:
mrk mE BRAINLIEST PLZZZZZZZZZZZz
PLS HELP FOR FINAL!!!!!!!!!!!!!!
Answer:
The answer is Ernest Rutherford.
Answer :
Ernest RutherfordHope I helpGood Luck
Why are infants and children often more susceptible to the effects of toxic substances than adult? (Explain)
From what I know personally from learning about this type of subject in the past is that children are more susceptible to the effects of toxic substances more than adults are, certain scientific data specifically indicate that children actually are for all intents and purposes more basically susceptible to toxic exposure than adults because they for the most part have proportionally definitely more intake of food contaminants, basically active developmental processes, basically multiple exposure pathways and really susceptible kind of socio-behavioral activities in a particularly major way.
How many grams of H2 are needed to completely react within 50g of N2?
Answer: 10.7 grams
Therefore, 10.7 grams of Hydrogen are necessary to fully react with 50.0 grams of Nitrogen.
A nebula is often made up of hydrogen and helium gases.
True
False
Answer:
Nebulae are made of dust and gases—mostly hydrogen and helium. ... Eventually, the clump of dust and gas gets so big that it collapses from its own gravity. The collapse causes the material at the center of the cloud to heat up-and this hot core is the beginning of a star.
Explanation:
Hope this helps
When 0.875 g. of magnesium was heated in air, 1.25 g. of magnesium oxide
(MgO) was produced. How much oxygen must be added?
Answer:
1. What is the coefficient for calcium in the balanced equation?
2 Ca + 5 NaOH → 4 Na + 2 Ca(OH)2
2. The burning of 20.0 g of acetylene (C2H2) produces what mass of carbon dioxide? You must
write the equation, balance it and solve the mass-mass problem.
a. Balanced equation:
2 C2H2 + 5 O2 4 CO2 + 2 H2O
Explanation:
An endothermic dissolution process a. absorbs energy as heat and has positive enthalpy of solution. b. releases energy as heat and has positive enthalpy of solution. c. absorbs energy as heat and has negative enthalpy of solution. d. releases energy as heat and has negative enthalpy of solution.An endothermic dissolution process a. absorbs energy as heat and has positive enthalpy of solution. b. releases energy as heat and has positive enthalpy of solution. c. absorbs energy as heat and has negative enthalpy of solution. d. releases energy as heat and has negative enthalpy of solution.
Answer:
a. absorbs energy as heat and has positive enthalpy of solution.
Explanation:
A reaction can either be exothermic or endothermic. An endothermic reaction, as the dissolution described in the question, is that which absorbs heat energy from the surroundings in order to start the reaction.
Because an endothermic reaction makes heat lost from the surroundings, the enthalpy (∆H) of the solution will be positive (+). ∆H is got by finding the difference between the enthalpy of the reactants and products and since the enthalpy of a product in endothermic reaction is more, the enthalpy change (∆T) will be positive.
What is the pressure of 13.7 mol of acetylene in a 48.1 L cylinder at 67.0 °C?
Answer:
hinojosa has caught you cheating
Explanation:
ur mom
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How does a new DNA molecule ensure that it has the same nucleotide sequence as the original DNA?
Answer:
This strand contains nucleotides that are complementary to those in the template sequence. Base pairing ensures that the sequence of nucleotides in the existing template strand is exactly matched to a complementary sequence in the new strand, also known as the anti-sequence of the template strand
How is entropy related to the spontaneity of a reaction? AP3X
Answer:
S>0 contributes to spontaneity.
Explanation:
i just took the test on a pex :)
According to the law of thermodynamics, the relationship between entropy and the spontaneity of a reaction is S > 0.
What is entropy?Entropy is the total amount of energy in a closed system that is present there, but there are no uses for that energy. It is the unused energy for any work.
By the second law of thermodynamics, any spontaneous process results in an increase in the universe's overall entropy. The total of the entropy produced by the spontaneous process and the change in energy brought on by the heat flow is known as the net change in entropy of the system or S.
The reaction will be spontaneous if the delta G is negative. Delta G is the Gibbs free energy. So the entropy S will be greater that the reaction.
The Gibbs free energy equation is:
△G = △H − T△S
Thus, the relation is S > 0.
To learn more about entropy, refer to the link:
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2 H2(g) + O2 (g) --> 2 H20 (1)
How many moles of hydrogen gas do you need to make 2 moles of liquid water?
Answer:
4moles of hydrogen atoms
Explanation:
The second conversion factor reflects the number of atoms contained within each molecule. Two water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.
Two samples of hot unknown metals of equal temperatures are dropped in separate containers of water at 30 degrees Celsius. The final temperature of sample A is 33.5 degrees, and the final temperature of sample B is 31.8 degrees. Which metal sample had the highest specific heat?
Answer:
Sample B has the highest specific heat
Explanation:
Specific heat of a material is defined as the heat necessary to increase in the temperature of 1g of material in 1°C.
The material with the highest specific heat requires more energy to increase its temperature.
In the problem, sample A and B are under the same amount of energy but sample A increases more its temperature. That means sample A has the lowest specific heat and:
Sample B has the highest specific heatis zinc an example of a element or compound?
Answer:
Zinc is an element.
Explanation:
Compounds are composed of two or more elements
Answer:
element
Explanation:
zinc is an element with atomic number 30
Which of the following has the most energy?
heat
ultraviolet rays
the color blue
radio waves
Answer:
C
Explanation:
12. A. 2 g of ferrous sulphate crystals 5 points
are heated in a dry boiling tube. a)
Name and define the type of reaction
that has taken place. b) Write
balanced chemical equation for the
above reaction. c) List two main
observations of this reaction. B. A
shining metal 'M'on burning gives a
dazzling white flame and changes to
a white powder ‘N’. a) Identify ‘M'and
'N'. b) Name the type of reaction
taking place and write the balanced
chemical equation.
Answer:
A) Decomposition reaction.
Decomposition reaction is defined as a chemical reaction whereby a compound is broken down into 2 or more simpler substances.
B) 2FeSO4 + Heat > Fe2O3 + SO2 + SO3
C) - Gas evolution because a gas is part of the product
- Upon heating its colour gradually changes from pale green to reddish brown which implies a change in state
Explanation:
A) Name of the reaction is; Decomposition reaction.
Decomposition reaction is defined as a chemical reaction whereby a compound is broken down into 2 or more simpler substances.
B) The balanced chemical equation is;
2FeSO4 + Heat > Fe2O3 + SO2 + SO3
C) From experience, the 2 main observations of this reaction are;
- Gas evolution because a gas is part of the product
- Upon heating its colour gradually changes from pale green to reddish brown which implies a change in state.
2C2H6 + 8O2 = 4CO2 + 6H2O
My teacher wants to know how many moles are required, how many moles oaf carbon dioxide are produced and how many moles of water are produced. Can somebody please help me?
Answer:
4 moles of carbon
6 moles of water
Explanation:
I think as there no data given u have to is the numbers infront of the equation e.g 4CO2 so 4.
hope this helps :)
Describe the process used to dilute a stock solution?
Answer:
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Explanation:
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*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:✧*:✧*:･ﾟ･ﾟ
*:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧ !!!!! Answer: add more solvent to decrease the concentration. A stock solution is a concentrated form of a particular chemical. To make a solution from the stock solution, a required amount of the stock solution has to be taken out and this will be diluted with pre-calculated amount of the correct solvent !!!! *:･ﾟ✧✧･ﾟ: *✧･ﾟ:**:･ﾟ✧*:･ﾟ✧
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Is everything correct?
How many units long is the circumference of a circle with diameter of 18 units?
Answer:
56.52 units
Explanation:
hope that helps :)
an organism that lives in or on another organism and causes harm to is a
A. host
B. parasite
C. prey
D. producer
the answer is B. Parasite.
How does increased exhalation of CO2 at the lungs (pulmonary regulation) restore the correct pH range?
Answer:
When CO2 levels become excessive, a condition known as acidosis occurs. This is defined as the pH of the
blood becoming less than 7.35. The body maintains the balance mainly by using bicarbonate ions in the
blood. As the body responds to neutralize this condition, an electrolyte imbalance – an increase of plasma
chloride, potassium, calcium and sodium, can occur.
Which statement most accurately describes a chemical equation?
a. in a chemical reaction, the mass of the energy change must be equal to the energy used
b. in a chemical reaction, the mass of the products must equal the mass of the reactants
c. in a chemical reaction, the mass of each product must be the same
d. in a chemical reaction, the combined mass of the container the substances is always equal
Answer: A
Explanation:
Is sulfur pentoxide a ionic or covalent bond?
A sample of helium has a volume of 3.49 L at 741 mmHg. What would be the volume if the pressure
were changed to 760 mmHg at the same temperature?
show work
P1: 741 mmHg
V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L
P2: 760 mmHg
V2: ? L
TEACH ME how to do question 2 through your explanations.
Answer:
Explanation:
The first two are easy:
H2O, H3O+ and OH- all exist in an equilibrium
[H3O+] = [OH-] = 10^-7 M
HCl is a strong acid so 1M of it will disassociate completely
[H3O+] = [Cl-] = 1 M
The third one is also an equilibrium as HNO2 is a weak acid. Ka is given so [HNO2] and [NO2-] can be calculated.
The fourth one is a buffer solution so its pH can be looked up to give the concentrations.
Answer:
Explanation:
H20 has pH of 7
1st reaction [H30+] = 10^-7M
[OH-] = 10^-7M
1M HCl has pH of 0
2nd reaction [H3O+] = 1M
[Cl-] = 1M
given Ka = 4.6x10^-3 = [H3O+]x[NO2-] / [HNO2]
and [HNO2] + [NO2-] = 1M
each concentration can be solved
beaker D is a buffer solution n requires more info 2 solve