Answers
Explanation...
Related Questions
What does the little 2 in 2CO2 mean?
Answers
Answer:
it means 2 oxygen atoms in the molecule
Explanation:
A train with an initial velocity of 31 m/s begins accelerating at rate of 0.0705 m/s^2. If the train travels for 180.5s, how far does it travel?
Answers
Answer:
v = 43.72 m/s
Explanation:
Given that,
Initial velocity of the train, u = 31 m/s
Acceleration of the train, a = 0.0705 m/s²
Time for which the train travel, t = 180.5 s
We need to find the final velocity of the train. Let it is v.. Using first equation of kinematics to find it such that,
[tex]v=u+at\\\\v=31+0.0705\times 180.5\\\\v=43.72\ m/s[/tex]
So the final speed of the train is equal to 43.72m/s.
a- Write the name of the process when the electron falls to a lower energy level and a photon is emitted
Answers
Answer:
emission
Explanation:
when atoms return to lower energy levels they emit photons, in a process called emission
An oxidizing flame resembles the neutral flame slightly, but has an inner cone that is shorter and more pointed with an almost purple color instead of brilliant white true or false
Answers
Answer:
True
Explanation:
The answer to this question is true. The oxidizing flame is a flame which is gotten when oxygen is used excessively. The flame is bluish or almost purple in color. And it makes a hissing sound. The flame from this is shorter than the neutral flame. In the neutral flame there is neither the occurrence of oxidation or reduction.
Lab: Limiting Reactant and Percent Yield
Student Guide
Pre-Lab Information
Purpose Explore the yield of a chemical reaction by identifying the limiting reactant, comparing the
theoretical and actual yields, and explaining the sources of error.
Time Approximately 45 minutes
Question While observing a chemical reaction, how can you tell which reactant is limiting?
Reaction The reaction of copper(II) chloride and aluminum is shown in this balanced equation:
3CuCl2 + 2Al 2AlCl3 + 3Cu
Hypothesis If a substance is the limiting reactant, then it will be fully consumed by the time the
reaction completes because it is the reactant that reacts completely and the reaction
cannot proceed further.
Summary You will react copper(II) chloride with different quantities of aluminum in two trials. You
will also calculate percent yield for Trial 2.
Answers
Answer:
pre lab information would be the thing you to ressearch the lab to get the information
Limiting Reactant and Percent Yield Lab Report attached
what is the ionic equation for dilute hydrochloric acid and magnesium
Answers
Answer:
Mg(s) + 2H⁺(aq) ⟶ Mg²⁺(aq) + H₂(g)
Explanation:
A net ionic equation shows all the ionic substances as ions and shows the correct state of each substance.
Magnesium react with hydrochloric acid according to the equation :
Mg(s)+2HCL(aq)----->MgCL2(aq) +H2(g)
This demonstration can be used to illustrate the characteristics reactions of metals with acid , a single replacement reaction ,or to demonstrate the generation of hydrogen gas.
An 886 mL sample of Neon gas is at 752 torr and 299 K. What will be the new volume if, with the pressure and amount of gas held constant the temperature is increased to 371 K?
Answers
Answer:
[tex]V_2=1099.35mL[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible to infer that as both the amount of the gas and the pressure remains the same, we can solve this problem via the Charles' law a directly proportional relationship between the volume and temperature:
[tex]\frac{V_2}{T_2} =\frac{V_1}{T_1}[/tex]
Thus, by solving for the final volume, V2, we obtain:
[tex]V_2 =\frac{V_1T_2}{T_1} \\\\V_2 =\frac{886mL*371K}{299K}\\\\V_2=1099.35mL[/tex]
Best regards!
People don't want to live in a warming world so maybe do less things that emit greenhouse gasses.
Answers
Answer:
yea that's true
things you can do is: reduce ,reuse, and recycle
reduce the use of air/heat
remove lightbulbs and replace led bulb
drive less
plant a tree
Explanation:
A student titrated 50 cm of sulphuric acid (H2SO4)of an unknown concentration
in a flask with sodium hydroxide (NaOH).
The acid required 30 cm3 of 0.500 mol/dm3 NaOH to reach the end point
H2SO4(aq)
+ 2NaOH(aq)
Na2SO4(aq) + 2H2O()
Calculate the concentration the acid.
Concentration =
mol/dm3
Answers
Mole ratio of NaOH:H2SO4= 2:1
No. of mol. of H2SO4: 0.015/2= 0.0075mol
Conc. of acid= 0.0075/(50/1000)= 0.15moldm^-3
Hope it helps, drop a thanks
what color does blue and cyan pigment make?
Answers
Answer:
Teal
Explanation:
Blue lightens the cyan.
What theoretical yield of NaCl would result from reacting 3.00 moles of Na2CO3 with excess HCl (aqueous)?
Answers
Answer:
350.7 g of NaCl
Explanation:
For this reactions our reactants are:
HCl and Na₂CO₃.
Then, the reaction is:
2HCl + Na₂CO₃ → 2NaCl + H₂CO₃
2 moles of hydrochloric acid react to 1 mol of sodium carbonate in order to produce 2 moles of salt and 1 mol of carbonic acid.
Ratio is 1:2. 1 mol of sodium carbonate can produce 2 moles of NaCl
Then, 3 moles of carbonate may produce (3 . 2) /1 = 6
We convert the moles to mass to determine the theoretical yield
6 mol . 58.45g /mol = 350.7 g
The theoretical yield of NaCl produced is 350.7 g.
What is NaCl?NaCl is a salt, and it is an ionic compound.
The reaction is
[tex]\rm 2HCl + Na_2CO_3 \rightarrow 2NaCl + H_2CO_3[/tex]
2 mol of HCl reacts with 1 mol of [tex]Na_2CO_3[/tex] and produces 2 mol of NaCl and 1 mol of [tex]H_2CO_3[/tex].
The ratio will be [tex]Na_2CO_3[/tex] : NaCl
1 : 2
Then, for 3 mol of [tex]Na_2CO_3[/tex]
[tex]\dfrac{3 \times 2}{1} = 6[/tex]
Now, convert the moles to mass
[tex]6\; mol \times 58.45g /mol = 350.7 g[/tex]
Thus, the theoretical yield produced is 350.7 g.
Learn more about NaCl
https://brainly.com/question/1473063
Select the correct answer.
John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up. What
happens when John rubs his hands?
O A. The skin on his hands rapidly conducts heat, similar to metal.
O B. He traps heat between his hands because skin is an insulator. IS
O C. The particles In his hands vibrate faster because of friction.
O D. Thermal energy moves from his fingertips to his palms.
O E. He simulates a fever that'll raise his core body temperature.
Answers
Answer:
Fairly certain it's C. The particles In his hands vibrate faster because of friction :)
Answer:
C
Explanation:
Describe how urine is formed, beginning with the blood. In 5th grade language please
Answers
Answer:
kidneys takes the waste out of the blood. It is then stored in the bladder, until the urinary tract takes the urine out of the body.
Create a model of the atoms of a substance moving through the solid, liquid, and gas states.
Answers
Answer correctly and dont bother coming to this question if you have the wrong answer.
Answers
Answer:
it's b or d I am not 100% sure witch one tho
Answer:
B.
Explanation:
It is B because it says which is an example of A PHYSICAL MODEL. B is a physical model becuase by using tennis balls to represent the plantes (including the sun)
it is a model of a problem!!!
Have a great day!
Hope this helps!
-Lea
Please Help! Brainliest!
Convert the following to milligrams: 5.6 x 10-4 kilograms. Show your work on a separate sheet of paper and attach
with your assignment.
Answers
Hi there!
Here's a picture to show you. Does this help?
PLSSS ANSWERRRRR????
Answers
Scientists have been able to find a full record of Earth's fossil history, thus making the fossil record complete.
True or False?
Answers
Answer:
False
Explanation:
Few organisms were not preserved as well as others, and new fossils are found every day
Can someone please answer this?
Answers
Answer:
B) go look on the periodic table for the atomic number
Explanation:
The atomic number is how many protons is in an atom
Answer:
Either A or B
Explanation: Because I learned it on Edge. :)
How many milliliters of 0.20 M NaOH must be added to 75 mL of 0.050 M HCl to make a neutral solution?
Answers
Answer:
this should help
Explanation:
What type of organism is the common house cat?
F
parasite
G
saprophyte
H
autotroph
J
heterotroph
Answers
Answer:
F
parasite
Explanation:
What causes the release of energy in an exothermic reaction? Bonds breaking Bonds breaking A catalyst A catalyst Bonds being formed Bonds being formed Electrons escaping the bond
Answers
Answer:
weak bonds break and strong bonds form
Explanation:
An exothermic reaction is a chemical reaction in which heat energy is evolved during the reaction process.
Bond formation requires energy while bond breakage releases energy. More energy is needed for the formation of weak bonds as compared to strong bonds.
Hence, when weak bonds break, they release more energy than needed to make a corresponding strong bond leading to the release of the remaining energy as heat.
What is the value that is MEASURED in a lab?
Answers
Answer:
To use standard laboratory measurement devices to measure length, volume and mass amounts.
The picture shows a community living in a dry, grassy area. A few organisms have died off due to lack of a water source. ******Is this an example of an abiotic or biotic limiting factor? WHY
Answers
Answer:
brainly blurred the half of the question i cant read it completely
Explanation:
WILL MARK BRAINLIEST!!
Need help plsss
Answers
6.32 KJ is how much heat is given off
Which energy transformation occurs when a match is lit?
A
Chemical energy to heat energy
B
Heat energy to potential energy
C
Electrical energy to heat energy
D
Kinetic energy to potential energy
Answers
Answer:
A
Explanation:
the chemical energy in the phosphorous in the match turns into heat energy once the match is struck and starts to combust.
Chemical energy to heat energy
9
If you wanted to make 250 mL of a 0.01 M solution of CaCl, calculate how many moles of calcium chloride would be
needed. Your response must include both a correct numerical setup and the calculated result. [1]
Answers
Answer:
0.0025moles
Explanation:
Molarity of a solution (M) = number of moles (n) ÷ volume (V)
According to this question, to make 250 mL of a 0.01 M solution of CaCl, the following number of moles is needed:
Volume = 250mL = 250/1000 = 0.250Litres.
Using; molarity = n/V
0.01 = n/0.250
n = 0.0025
n = 2.5 × 10^-3 moles.
How many moles of nitrogen gas are present in a 28.9 dm3 temperature of 55.0 °C and a pressure of 144 kPa?
Answers
Given :
Temperature, T = 55° C = ( 55 + 273 ) K = 328 K .
Volume of container, V = 28.9 dm³ = 0.0289 m³ .
Pressure, P = 144 kPa = 144000 Pa .
To Find :
Number of moles of nitrogen gas.
Solution :
We know, by ideal gas equation :
PV = nRT ( R ( universal gas constant ) = 8.31 J K⁻¹ mol⁻¹ .
[tex]n = \dfrac{PV}{RT}\\\\n = \dfrac{144000\times 0.0289}{8.31 \times 328} \ moles\\\\n = \dfrac{4161.6}{2725.68}\\\\n = 1.53 \ moles[/tex]
Therefore, number of moles of nitrogen gas is 1.53 moles.
What is the percent by mass of C in benzene (C6H6)? The molecular weight of carbon is 12.0107 g/mol and of hydrogen 1.00794 g/mol
Answers
Answer:
92.26% of C
Explanation:
To solve this problem we must assume we have 1 mole of benzene. The mole contains 6 moles of C and 6 moles of H. We have to convert these moles to grams in order to find the total mass and mass percent will be:
Mass atom / Total mass * 100
Mass C: 6mol C * (12.0107g / mol) = 72.0642g
Mass H: 6mol H * (1.00794g / mol) = 6.04764g
total mass: 72.0642g + 6.04764g = 78.11184g
Mass percent of C will be:
72.0642g C / 78.11184g* 100
92.26% of Cqestions do you have about plate tectonics
Answers
From the deepest ocean trench to the tallest mountain, plate tectonics explains the features and movement of Earth's surface in the present and the past.
Developed from the 1950s to the 1970s, the theory of plate tectonics is the modern update to continental drift, an idea first proposed by scientist Alfred Wegener in 1912 which stated that Earth’s continents had “drifted” across the planet over time. Wegener didn't have an explanation for how continents could move around the planet, but researchers do now: plate tectonics.
Plate tectonics is the theory that Earth's outer shell is divided into large slabs of solid rock, called “plates,” that glide over Earth's mantle, the rocky inner layer above Earth’s core. Earth’s solid outer layer, which includes the crust and the uppermost mantle, is called the lithosphere. It is 100 km (60 miles) thick, according to the Encyclopaedia Britannica. Below the lithosphere is the asthenosphere—a viscous layer kept malleable by heat deep within the Earth. It lubricates the undersides of Earth's tectonic plates, allowing the lithosphere to move around.
Answer:
1. How fast do tectonic plates move? Answer: There are seven major plates: African, Antarctic, Eurasian, Indo-Australian, North American, Pacific and South American
2. What are the factors affecting plate tectonics? Answer: The force that causes most of the plate movement is thermal convection, where heat from the Earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the plates of the crust along with them.
3. What 3 things support the theory of plate tectonics? Answer: Modern continents hold clues to their distant past. Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.
Explanation: