Answer:
(1)
(c) A teacher puts hot sodium into a gas jar of chlorine.
The changes seen before, during and after this reaction were observed.
Complete the sentences.
Choose the answers from the box.
colourless
green
lilac
silver
white
yellowlorange
Sodium is a
solid.
Chlorine is a
gas.
The hot sodium burns with a
flame.
The product sodium chloride is a
solid.
1. slivery-white
2. yellow
3. lilac
4. colourless
Explanation:
Imagine you are working in the lab and your chemical bottle is labeled Fe2O3. Explain how you could
determine if the iron in the compound is Fe+2 or Fe+3. Provide the name of the compound in your
answer.
Burning hydrogen is an example of a chemical reaction. The reaction is
shown in the diagram. Which of the following statements about energy in
this reaction is the most accurate?
There is no energy in this reaction
B. from 52 moles of nitric acid, how many moles of silver nitrate will be produced?
Answer:
39 mol AgNO3
Explanation:
We have the equation 4HNO3 + 3Ag -----> 3AgNO3 + NO + 2H2O
We want to calculate the number of silver nitrate (AgNO3) moles that would be produced from 52 moles of nitric acid ( HNO3 )
We can calculate this by using mole ratio as well as dimensional analysis.
The mole ratio of Silver nitrate to nitric acid based on the balanced equation is 3AgNO3:4HNO3.
Using this we can create a table: The table is attached.
Breakdown of the table.
The moles of nitric acid cancel out and we multiply 52 by 3/4 to get 39 moles of Silver nitrate.
Difference between carbon monoxide and carbon dioxide.
Answer: Number of oxygen atoms
because carbon dioxide is named CO2 which means 1 carbon 2 oxygen and monoxide is CO or 1 carbon one oxygen
Explanation:
why can ionic compounds
Conduct electricity ?
Explanation:
Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
What are some common structures of all cells?
How many C8H18 particles would be in 12.6 moles of octane (C8H18)?
Taking into account the definition of Avogadro's number, 7.59×10²⁴ particles of C₈H₁₈ would be in 12.6 moles of octane.
Definition of Avogadro's NumberAvogadro'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.
Amount of C₈H₁₈ particlesThen you can apply the following rule of three: If by definition of Avogadro's number 1 mole of C₈H₁₈ contains 6.023×10²³ particles, 12.6 moles of the compound contains how many particles?
amount of particles of C₈H₁₈= (6.023×10²³ particles × 12.6 mole)÷ 1 mole
amount of particles of C₈H₁₈= 7.59×10²⁴ particles
Finally, 7.59×10²⁴ particles of C₈H₁₈ would be in 12.6 moles of octane.
Learn more about Avogadro's Number:
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Write the balanced equation for the reaction of sodium with water to form sodium hydroxide and
hydrogen
2 Na ( s ) + 2 H2O ( l ) = 2 NaOH ( aq ) + H2 ( g )
Here's the balanced equation
A 5.00 L sample of helium expands to 15.0 L, at which point the pressure is measured to be 0.720 atm. What was the original pressure of the gas
The original pressure of a gas that has 5.00 L of its sample expanded to 15.0 L, at which point the pressure is measured to be 0.720 atm is 2.16atm.
How to calculate pressure?The pressure of a gas can be calculated using the Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressureP2 = final pressureV1 = initial volumeV2 = initial volumeP1 × 5 = 15 × 0.720
5P1 = 10.8
P1 = 10.8 ÷ 5
P1 = 2.16atm
Therefore, the original pressure of a gas that has 5.00 L of its sample expanded to 15.0 L, at which point the pressure is measured to be 0.720 atm is 2.16atm.
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more sugar dissolves in hot water than in cold water why?
Answer:
Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster.
Explanation:
What aspect of sound waves does the student observe? A. absorption B. refraction C. resonance D. transmission
Resonance and transmission are the two aspects of sound waves that the student observe.
What is resonance?Resonance is defined as when one object vibrating at a specific natural frequency and compels the second object into vibrational motion.
We know that sound waves required medium and transmit from one place to other by transferring the sound energy to its neighbouring particles so we can conclude that Resonance and transmission are the two aspects of sound waves that the student observe.
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A gas occupies 30. L at 2.0 atm pressure and 27°C. Calculate the volume of the gas if
the pressure remains at 2.0 atm, but the temperature is raised to 54°C.
Answer:
V2 = 33L
Explanation:
KNOW THAT:
V1 = 30L
P1 = 2.0atm
T1 = 27 + 273.15 = 300.15k (it's help to be in Kelvin)
P2 = 2.0 atm
T2 = 54 = 273.15 = 327.15
V2 = ?
We have an equation: P1V1/T1 = P2V2/T2
Multiply both side for T2 to remove it, divided both side for P2 to remove it. So we can left with V2, and that is what we want to find.
T2P1V1/T1P1 =>> V2= 33L
What is the constant movement
of water from the ground, to the
sky, and back again called?
A rain
B snow
C water cycle
D rain clouds
Answer:
C the water cycle
Explanation:
The water gets evaproated, then it becomes clouds and thn it makes precipitation! The correct answer is the water cycle!
Have an amazing day!!!
PLEASE RATE AND MARK BRAINLIEST!!
two lamps (with a resistance of 10 Ohms each) are connected in a parallel circuit and are supplied with 100- volts of power. which of the following statements are true of the voltage that each lamp receives
a. Each lamp will recieve 50 volts
B. Each lamp will recieve 100 volts
C. The first lamp will recieve more voltage than the second lamp
In the parallel circuit, each lamp will receive 100 volts.
Equivalent resistance of the parallel circuitThe equivalent resistance of the parallel circuit is the inverse sum of the resistance of the two resistors in the circuit. This is as a result of different current flowing in each resistor parallel circuit arrangement.
The equivalent resistance is calculated as follows;
1/R = 1/10 + 1/10
1/R = 2/10
R = 10/2
R = 5 ohms
Current in each resistorI = V/R
I = 100/10 = 10 A
Voltage in each resistorV = IR
V = 10 X 10 = 100 V
Generally, for a circuit in parallel connection, same voltage will flow in each resistor of the circuit while different current will flow in the resistors.
Thus, the correct statement is, "Each lamp will receive 100 volts".
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Magnesium oxide does not readily decompose into magnesium and oxygen. the reaction is shown below. mgo(s) 601.7 kj right arrow. mg(s) ½o2(g) which factor plays the most important role in allowing this reaction to occur? temperature concentration pressure surface area
Temperature factor plays the most important role in the decomposition reaction of magnesium oxide.
What is spontaneous reaction?
Those reactions which are exothermic in nature or release heat during the reaction are spontaneous reactions.
Given decomposition reaction of magnesium oxide is:
MgO(s) + 601.7 kJ → Mg(s) + ½ O₂(g)
From the above reaction, it is clear that during the decomposition of magnesium oxide heat is absorbed. So, for the feasible decomposition of compound accurate temperature is wanted.
Hence, correct option is temperature.
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Answer:
temperature
A.
Explanation:
edgen
90 is 50% of what number?
Part = Whole x Percent
P:
W:
%
Answer:
90 is 50% of 180
Explanation:
Just multiply 80 by 2 for 50%
HELP ASAP
Which if the following help a tropical storm become a hurricane? making landfall a cold wind an earthquake warm water
making landfall
a cold wind
an earthquake
warm water
Answer:
a cold wind
Explanation:
It starts as a tropical disturbance. Then, with cyclonic circulation and faster wind speeds, it becomes a tropical depression. If the wind keeps getting faster, it becomes a tropical storm and then a hurricane if winds are more than 74 miles per hour (mph).
Who was the first person to suggest the existence
of atoms?
Dalton
Democritus
Proust
O
Thomson
Answer is C
Answer:
democritus is the first person
Which of the following is the name of the process occurs in the sun, in which two hydrogen nuclei combine to make when helium nucleus 
Answer:
This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom.
I NEED HELP ASAP! I don’t know like how to draw it
Explanation:
Take the first 6 going down and that's how your gonna do it
Copper (II) Oxide is mixed with Zinc Iodide
Balanced Chemical Equation:
Answer:
CuO + Zn → ZnO + Cu
Explanation:
Please mark me as brainlist. Hope this helps you.
Select all of the examples of sound resonance. A. plucking a harp string producing a high tone B. hearing "the ocean" in a seashell held up to the ear C. wearing sound cancellation earphones to block out noise D. blowing over the opening of a bottle producing a low tone E. noticing a change in pitch of the siren as a firetruck moves past
Answer
I know the answer
Explanation:
what is electrochemistry?
Answer:
The study of electricity in chemistry.
help!
If the distance between a proton and electron is cut in half, how will that affect the electric force?
A. Cut in half
B. Doubles
C. Quadruples
D. Decreased by four times
Answer:
it will doublethe force attraction
Using the reaction below, calculate how many grams of CO2 is produced from 100 grams of CH4. CH4 + 2 O2 → CO2 + 2 H2O Round your answer to the 2nd decimal place (hundredths).
Answer:
274.08 g of CO2
Explanation:
please see paper for work!
A sample of sodium hydroxide (NaOH) has a mass of 160. 0 g. The molar mass of NaOH is 40. 00 g/mol. How many moles of NaOH does this sample contain? 4. 000 moles 40. 00 moles 160. 0 moles 6,400 moles.
4 moles of NaOH is present in the given 160 grams of NaOH.
How we calculate moles?Moles of any substance will be calculated as:
n = W/M, where
W = given mass of NaOH = 160 grams (given)
M = molar mass of NaOH = 40 g/mole
Moles of NaOH is calculated as:
n = 160g / 40g/mol = 4 moles
Hence, moles of sodium hydroxide (NaOH) is 4 moles.
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Petroleum lowest boiling point
plssssss
95 C/ 203 F
Explanation:
Which force controls the size of an atomic nucleus?.
Answer:
strong nuclear force
Explanation:
1, a force that acts on charged particles
2, a force that holds atomic nuclei together
3, gravity, weak nuclear, electromagnetic, strong nuclear
4, strong nuclear force
5, Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.
100% :)
Describe how continents change over time.
Radon-22 has a half –life of approximately 6 days. If you begin with a sample containing 40 grams of radon, how many grams of radon will be left after 24 days?