Answers
Answer:
i think its the gibbous phase
Explanation:
Related Questions
(4 pts) Fill in the number of protons and electrons for each product and reactant (two boxes have been filled in for you). (2 pts) Verify that the number of protons on the left side of the chemical equation is equal to the number of protons of the right side. Show your work. (2 pts) Verify that the number of electrons on the left side of the chemical equation is equal to the number of electrons of the right side. Show your work. (3 pts) Which substance is being oxidized
Answers
Answer:
a)
Zn(s) + 2 H⁺(aq) ⇒ Zn²⁺(aq) + H₂(g)
#p⁺ 30 2 30 2
#e⁻ 30 0 28 2
b) 32
c) 30
d) Zn
Explanation:
There is some info missing. I will add the complete question.
Consider the following oxidation/reduction reaction.
Zn(s) + 2 H⁺(aq) ⇒ Zn²⁺(aq) + H₂(g)
#p⁺ 2
#e⁻ 2
a) Fill in the number of protons and electrons for each product and reactant (two boxes have been filled in for you).
b) Verify that the number of protons on the left side of the chemical equation is equal to the number of protons of the right side. Show your work.
c) Verify that the number of electrons on the left side of the chemical equation is equal to the number of electrons of the right side. Show your work.
d) Which substance is being oxidized?
a) The atomic number of Zn is 30 so it will have 30 protons. Since it ts neutral, it will also have 30 electrons. Zn²⁺ will also have 30 protons but it lost 2 electrons, so it has 28 electrons. The atomic number of H⁺ is 1, so each H atom will have 1 proton (2 in total). But since H has 1 electron, and H⁺ lost 1 electron, H⁺ will have 0 electrons. The complete chart is:
Zn(s) + 2 H⁺(aq) ⇒ Zn²⁺(aq) + H₂(g)
#p⁺ 30 2 30 2
#e⁻ 30 0 28 2
b) The total number of protons on the left side is: 30 + 2 = 32.
The total number of protons on the right side is: 30 + 2 = 32.
c) The total number of electrons on the left side is: 30 + 0 = 30.
The total number of electrons on the right side is: 28 + 2 = 30.
d) Zn(s) is oxidized because it loses electrons (from 30 to 28) and its number increases.
Which of these is a disadvantage of wind energy?
a. it is renewable.
0
b. it reduces greenhouse gas emissions.
0
c. it is abundant.
0
d. it reduces bird and bat populations
Answers
Answer: d
Explanation: took the test got it right
What is the volume of 40.0 grams of argon gas at STP ?
Answers
Answer:
24.9 L Ar
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KAqueous Solutions
States of MatterStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
[Given] 40.0 g Ar
[Solve] L Ar
Step 2: Identify Conversions
[PT] Molar Mass of Ar - 39.95 g/mol
[STP] 22.4 L = 1 mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 40.0 \ g \ Ar(\frac{1 \ mol \ Ar}{39.95 \ g \ Ar})(\frac{22.4 \ L \ Ar}{1 \ mol \ Ar})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 24.9235 \ L \ Ar[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
24.9235 L Ar ≈ 24.9 L Ar
Explain why a city that receives 10 hours more light each day has colder average temperatures. Explain
Answers
Explanation:
This would be similar to how the poles work in the North and South. Due to their placement, they recieve much more sun light than the rest of the Earth since we rotate horizontally. However, their placement also makes them farther from the sun than the rest of Earth, therefore not receiving as much heat.
Write an equation and solve the problem.
3. Dexter buys a package of 38 plates. He already
has 4 plates. He puts an equal number on each of
6 tables. How many plates are on each table?
Answers
As mentioned, every step in the Fischer esterification mechanism is an equilibrium. As such, the reaction conditions are chosen in such a way to drive reaction to completion. a. For the reaction you have chosen, calculate the number of moles of carboxylic acid and the number of moles of alcohol given using the starting volumes given in the experiment
Answers
Answer:
Hello your question lacks some required information attached below is the missing information
answer :
number of moles
Acetic acid = 0.061199 mole
Alcohol = 0.027320 mole
Explanation:
The starting volumes : 2.5mL of either alcohol and 3.5mL of either acid
for the purpose of this solution I will take 2.5 mL of 1-butanol and 3.5 mL of acetic acid
mass of 1-Butanol = 2.5 mL * 0.81 g/mol = 2.025 g
∴ number of moles of 1-butanol = 2.025g / 74.12 g/mol = 0.027320 mole
mass of acetic acid = 3.5 mL * 1.05 g/mol = 3.675 g
∴ number of moles of Acetic acid = 3.675 g/ 60.05 g/mol = 0.061199 mole
Reaction equation
CH3-CH2-CH2-CH2-OH + CH3-COOH + H+ (cat) ↔ CH3-CH2-CH2-CH2-O-CO-CH3 + H2O
Calculate the mass (grams) of 0.750 moles of Al2(Cr2O7)3
Answers
Answer:
526g is the mass of this sample
Explanation:
To solve this question we must, as first, find the molar mass of Al₂(Cr₂O₇)₃ using the periodic table. The molar mass is defined as the mass of this compound per mole. With this value we can find the mass in 0.750 moles as follows:
Molar mass Al₂(Cr₂O₇)₃
2Al = 2*26.98g/mol = 53.96g/mol
6 Cr = 6*51.9961g/mol = 311.9766g/mol
21 O = 21*15.999g/mol = 335.979g/mol
53.96g/mol + 311.9766g/mol + 335.979g/mol
= 701.9156g/mol
The mass of 0.750 moles is:
0.750 moles * (701.9156g / mol) =
526g is the mass of this sampleA student is heating a crystal of alum to
determine the hydrate formula. If she removes
it from the heat before all the water has been
removed, what will happen to the calculated
hydrate formula?
A. It will not be affected by the error.
B. The mole ratio will indicate less water than was
actually present.
C. The mole ratio Will indicate less alum than was
actually present.
Answers
A percent composition analysis yields
22.6% phosphorus (P) and 77.4%
chlorine (CI). What is the empirical
formula for the compound?
А
B
P2C17
PCI:
Answers
Answer:
PCl₃
Explanation:
To determine the empirical formula of a compound, we need to follow a series of steps.
Step 1: Divide each percent composition by the atomic mass of the element
P: 22.6/30.97 = 0.729
Cl: 77.4/35.45 = 2.18
Step 2: Divide all the numbers by the smallest one, i.e. 0.729
P: 0.729/0.729 = 1
Cl: 2.18/0.729 ≈ 3
The empirical formula of the compound is PCl₃.
A gas is contained in a thick-walled balloon. When the pressure changes from ___ kPa to 114 kPa, the volume changes from 0.654 L to 1.32 L and the temperature changes from 596 K to 715 K.
Answers
Answer: 191.8
Explanation:
Answer:
191.8
Explanation:
I know the answer is correct I got the exact same one :)
What is the hydronium ion concentration of a solution whose pH is 4.12?
a. 5.1 x 10–6 M
b. 7.6 x 10–5 M
c. 6.4 x 10–5 M
d. 4.4 x 10–8 M
Answers
In the balanced equation-aPb(NO3)2(s)heatb PbO(s)+ c NO2(g)+ dO2(g); the values of a,b,c, d are respectively
Answers
Answer:
The balance reaction is
2Pb(NO3)2 ----》4NO2+2PbO+O2
hence the value of a,b,c,d are 2,4,2,1 respectively!
What type of cloud is associated with a warm front
Answers
Please help me l don’t understand please !!!!!!
Answers
Answer: C
Explanation:
he never had evidence in the first place that was nearly enough.
Which object will have more potential energy (PE), a book on the edge of a small bookshelf or a penny sitting on the edge of the Empire State building? EXPLAIN your reasoning.
Answers
Answer: I dont know
Explanation: figure it out
Someone please help me and thank you
Answers
Answer:
what grade is this?
Formula mass of Ca(NO2)2
Answers
Answer: 132.1 g/mol
Explanation: 40.08 + 2·(14.01+2·16)
Was rays birthday lit
Answers
Answer:
Yes.
Explanation:
Yes.
Answer:10-1707
Explanation:
The atmospheric pressure at 1000 m altitude is 0.868 atm.
What is this pressure in Pascals?
Pa
Answers
Answer:0.868
Explanation:
Answer: 87950.1 Pascals
11. The modern periodic table is arranged in order of increasing atomic
O radius
O charge
O number
O mass
Answers
Answer:
number. so the option is c
Answer:
atomic number
Explanation:
i just know it
How deep below Earth's surface do rocks melt?
A. 1000 km
O B. 50 m
C. 500 km
D. 50 km
Answers
The answer is D. 50 km
The colder parts of the surface of Pluto have a temperature of –382°F. What is this temperature in Celsius?
Answers
Step-by-step explanation:
Well assign the coldest place on earth on the day as having x temperature
Therefore based on the statement;
2x – 53.6 = -280
2x = -280 + 53.6
2x = - 226.4
X = -113.2
Determine how many molecules are in 86L of carbon dioxide at STP?
Answers
Answer:How can you tell how much gas is in these containers?
Small gas tanks are often used to supply gases for chemistry reactions. A gas gauge will give some information about how much is in the tank, but quantitative estimates are needed so the reaction will be able to proceed to completion. Knowing how to calculate needed parameters for gases is very helpful to avoid running out too early.
Conversions Between Moles and Gas Volume
Molar volume at STP can be used to convert from moles to gas volume and from gas volume to moles. The equality of 1 mole = 22.4 L is the basis for the conversion factor.
Sample Problem One: Converting Gas Volume to Moles
Many metals react with acids to produce hydrogen gas. A certain reaction produces 86.5 L of hydrogen gas at STP. How many moles of hydrogen were produced?
Step 1: List the known quantities and plan the problem.
Known
86.5 L H2
1 mol = 22.4 L
Unknown
moles of H2
Apply a conversion factor to convert from liters to moles.
Step 2: Calculate.
Explanation:
How are nuclear fission and nuclear fusion similar?
A. Both processes combine smaller nuclei into larger nuclei.
B. Both processes convert mass into energy.
C. Both processes are used to produce electrical power.
D. Both processes occur in stars.
Answers
Answer:
C. Both processes convert mass into energy.
2. A chemical's flash point is the
Answers
- Rachel performed an investigation to study the thermal conductivity of four different materials. She started with four identically shaped rods—each made of a different material. Then, she placed one end of each rod into a pot of boiling water, which was at 100°C.
- After five minutes, Rachel measured the temperatures of the ends of the rods that were sticking up out of the pot to see whether they got hot. Her results are shown below.
Thermal Conductivity Investigation
Material Temperature of End of Rod After 5 Minutes
Material 1 41°C
Material 2 53°C
Material 3 98°C
Material 4 59°C
- Rachel knows that one of the materials is copper and that copper conducts thermal energy very well. Which of the materials is most likely copper?
A.
material 1
B.
material 3
C.
material 4
D.
material 2
Answers
Answer:
I will have the maths book
Answer:98
Explanation:
Can someone help me I am stuck on this question it would mean the world if u helped me =) have a nice day!
Answers
Answer:
C: Plants mostly need air, water and sunlight to grow
Explanation:
Calculate the pH of each solution:
0.030 M HBr
3.0 M HF
0.50 M HNO3
O.0010 M NaOH
0.150 M KOH
Answers
Which sound frequency with a human ear be able to detect? Select ALL correct answers.
100 Hertz
1,000 Hertz
10,000 Hertz
100, 000 Hertz
The answers are 100, 1,000, 10,000 if your are with K12
Answers
Answer:
100 HZ 1,000 HZ 10,000 HZ there you go :)
Answer:
100 hertz, 1,000 hertz, and 10,000 hertz
Explanation:
I took the k12 test :)
HELP! 20 mL of hydrogen measured at 15°C is heated to 35°C.
What is the new volume at the same pressure?
Answers
Answer:either 20.38 or 21.38
Explanation:
i clicked on 10.38 and it was wrong, i also clicked on 22.38 and it was wrong lol
Answer: 21.38 mL
Explanation: i just answered it on ck-12