Answer:
dora needs help
Explanation:
Answer:
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.What type of energy includes both kinetic and potential energy?
Answer:
mechanical energy
Explanation:
A student determines the density of an unknown liquid by weighing a sample of known volume. The reported density is found by the instructor to be significantly higher than it should be. Which of the following experimental errors could account for this result?
A. The pipet used was filled to a level above the calibration mark.
B. The balance was read incorrectly, and the recorded sample mass was lower than the true sample mass.
or
C. A part of the sample was spilled from the beaker before it was weighed.
Answer: C. A part of the sample was spilled from the beaker before it was weighed.
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{Volume}[/tex]
Density is directly related to mass and inversely related to volume. Thus if density is measured to be higher than it should be , it could be due to more mass or less volume.
Thus errors could be a part of the sample was spilled from the beaker before it was weighed.
The correct option is C. A part of the sample was spilled from the beaker before it was weighed.
The following information should be considered:
Density refers to the mass contained per unit volume.Density is directly related to mass and inversely related to volume.Learn more: https://brainly.com/question/4626564?referrer=searchResults
If you were balancing an equation containing the O2 molecule, which of the following would be correct representations of O2 and its coefficient?
a. ½O2
b. O2
c. 3O2
d. 6O2
e. 3O
f. 5O3
Answer:
a. ½O2
b. O2
c. 3O2
d. 6O2
Explanation:
Hello!
In this case, since balancing chemical reactions can be attained by adding coefficients prior to each species in the chemical equation, we infer that the following representations are correct because they have a coefficient and the molecule O2 as diatomic oxygen:
a. ½O2
b. O2
c. 3O2
d. 6O2
It means that e. and f. are wrong because even when they have the coefficient, the molecule O2 is not properly written.
Best regards!
The correct representations of O2 and its coefficient are: ½O2, O2, 3O2, 6O2.
Oxygen molecule O2 exists as a diatomic molecule that comprises two atoms chemically bonded together.
When oxygen undergoes a chemical reaction with other compounds, the diatomicity of oxygen O2 is still usually maintained.
The coefficient of oxygen O2 varies depending on the reaction in which oxygen undergoes such as:
combustion reaction with alkanes,the reaction of iron with oxygen O2, reaction with magnesium etc.An oxygen molecule does not exist as 3O and 5O3 represent a reaction of ozone.
Therefore, we can conclude that the correct representations of O2 and its coefficient are: ½O2, O2, 3O2, 6O2.
Learn more about balancing chemical reactions here:
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You have a 500.0 ml graduated cylinder filled with 100.0 mL of water. You carefully add a 178.5 gram piece of iron (density of iron = 7.87 g/mL). What is the final volume reading in the graduated cylinder after adding the iron piece?
Answer:
122.7 mL
Explanation:
Step 1: Given data
Volume of water: 100.0 mLMass of the piece iron (m): 178.5 gDensity of iron (ρ): 7.87 g/mLStep 2: Calculate the volume of the piece of iron
Density is equal to the mass of the piece divided by its volume.
ρ = m/V
V = m/ρ
V = 178.5 g/(7.87 g/mL) = 22.7 mL
Step 3: Calculate the volume of the mixture
The volume of the mixture is equal to the sum of the volume of water and the iron piece.
100.0 mL + 22.7 mL = 122.7 mL
Sulfur dioxide (SO2) is an unwelcome result
of burning soft coal in power plants. Some
of the SO2 ends up as sulfuric acid in acid
precipitation. The net reaction is
2 SO2(g) + O2(g) + 2 H2O(l) —— 2 H2SO4(l)
What mass in grams of SO2 is needed to
react with 1771 g of O2?
Answer in units of g.
Answer:
I believe it is 1771 divided by 4
Explanation:
The substance krypton has the following properties normal melting point 115.9 K normal boiling point: 119.8 K triple point: 0.72 atm. 115.8 K critical point: 54.3 atm. 209.4 K A sample of krypton at a pressure of 1.00 atm and a temperature of 149.2 K is cooled at constant pressure to a temperature of 107.8 K Which of the following are true?
a) The final state of the substance is a solid
b) One or more phase changes will occur
c) The final state of the substance is a liquid
d) The sample is initially a gas
e) The solid initially present will vaporize.
Answer:
B. One or more phase change occur
C. the final state of substance is liquid
D. the sample initially gas
Explanation:
The pressure p = 1.00 atm
The temperature t = 149.2K
The temperature > 119.8K
119.8K being the normal boiling point.
This shows that the krypton is a gas
After it has cooled the pressure = 1.00 atm
The temperature T dropped to 107.8K
T < 115.9K
The melting point has been put as 115.9K
This is a liquid. The final state of the substance is a liquid. Since the temperature is less than the melting point and the pressure is 1.00 atm
in a double replacement reaction cesium chloride reacts with silver nitrate to produce silver chloride and
a cacl
b cs(no3)2
c agcs
d csno3
Answer:
CsNO₃
Explanation:
The reactants are:
Cesium chloride = CsCl
Silver nitrate = AgNO₃
Products:
Silver chloride = AgCl
The other product:
Now;
CsCl + AgNO₃ → AgCl + ?
The other product is CsNO₃
So;
CsCl + AgNO₃ → AgCl + CsNO₃
Which of the following is NOT a factor in how much voltage is produced by a
generator?
How fast the magnet in the generator is moving through the coiled wire
How many amps are run through the electromagnet of the generator
How strong the magnet in the generator actually is
How many times the wire is coiled in the generator....
Answer:
How fast the magnet in the generator is moving through the coiled wire
Explanation:
Another name for an electric generator is the electric motor. It is a device that is used to convert mechanical energy into electrical energy.
It comprises of a rectangular coil of insulated wire called armature which rotates about a fixed axis. Powerful magnets provides the required magnetic field. A commutator made of split ring copper and two carbon brushes are attached to it.
The voltage produced by the electric motor depends on;
i) The strength of the magnetic field.
ii) The number of turns of the coil
iii) The current across the armature
PLEASE HELP ASAP I NEED IT
the answer is true the first one
__HgO __Hg + __O2 what is the reaction
Answer:
2HgO <---- 2Hg + O2
Explanation:
what can scientists learn from index fossils?
Answer:
dating and correlating the strata in which it is found
Explanation:
Answer:
The correct answer is A:The age of an unfamiliar layer of rock
Explanation:
I promise that I got it correct on A P E X <3
6. Primary succession usually occurs after which catastrophic events?
a.) Volcanic eruptions burning down a forest
5. Hurricanes flooding a forest
c. Tomadoes uprooting trees leaving behind the soil
d. Glaciers moving revealing bare rock underneath
Answer: d. Glaciers moving revealing bare rock underneath
Explanation:
Primary succession is what happens when living things colonise an area that was previously uncolonized because it had been destroyed or hadn't been created yet.
When glaciers move on from areas and expose the bare rock underneath, these areas are new and so primary succession will take place as living things begin to colonize this new area.
At Grangemouth, BP make large quantities of ethanol by a process called catalytic
hydration of ethene:
C2H4 + H2O → C2H5OH
What mass of ethanol would be produced from 560kg of ethene
process step by step, please
Answer:
Mass = 799971.50 g
Explanation:
Given data:
Mass of ethene = 560 Kg (560 Kg ×1000 g/1 Kg= 560000 g)
Mass of ethanol produced = ?
Solution:
Chemical equation:
C₂H₄ + H₂O → C₂H₅OH
Number of moles of ethene:
Number of moles = mass/molar mass
Number of moles = 560000 g / 28.05 g/mol
Number of moles = 19964.35 mol
Now we will compare the moles of ethene and ethanol.
C₂H₄ : C₂H₅OH
1 : 1
19964.35 : 19964.35
Mass of ethanol:
Mass = number of moles × molar mass
Mass = 19964.35 mol × 46.07 g/mol
Mass = 799971.50 g
Number
850095
Scientific
Notation
0-2
What is the scientific notation to 850095? Is it 8.5 x10^4
Answer:
8.50095 x 10^5
Explanation:The purpose of scientific notation is for scientists to write very large, or very small, numbers with ease.
Calculating scientific notation for a positive integer is simple, as it always follows this notation:
a x 10b
Follow the steps below to see how 850,095 is written in scientific notation.
Step 1
To find a, take the number and move a decimal place to the right one position.
Original Number: 850,095
New Number: 8.50095
Step 2
Now, to find b, count how many places to the right of the decimal.
New Number: 8 . 5 0 0 9 5
Decimal Count: 1 2 3 4 5
There are 5 places to the right of the decimal place.
Step 3
Building upon what we know above, we can now reconstruct the number into scientific notation.
Remember, the notation is: a x 10b
a = 8.50095
b = 5
Now the whole thing:
8.50095 x 105
Step 4
Check your work:
105 = 100,000 x 8.50095 = 850,095
the reaction between potassium metal and water produces potassium hydroxide and hydrogen gas.
the correct equation for this reaction is:
A: K + H2O—> KOH + H2
B: K + H2O—>KOH + H
C: 4K + 3H2O—> 4KOH + 2H
D: 2K + 2 H2O—> 2KOH + H2
Answer:
2K + 2H₂O → 2KOH + H₂
Explanation:
The reactants are:
Potassium metal = K
Water = H₂O
The products are:
Potassium hydroxide = KOH
Hydrogen gas = H₂
The reaction equation is given as;
Reactants → Products
2K + 2H₂O → 2KOH + H₂
The reaction is a single displacement reaction
26. A Grignard's reagent may be made by
reacting magnesium with which of the
following compound ?
(A)
Methyl amine
(B) Diethyl ether
(C
)
Ethyl iodide
(D)
Ethyl alcohol
what is visibility ?
Answer:
Something or someone you can see invisibility is the opposite of something you cannot see or some thing you cannot see
Explanation:
Why is it easier to switch to solar and wind energy as compared to other alternative energy sources? Select all that apply.
A. They are more cost-effective.
B. They require large, easily obtainable parcels of land.
C. They can be produced easily in areas with geothermal activity.
D. The land can be used for other purposes while supplying energy.
Answer:C. They can be produced easily in areas with geothermal activity.
D. The land can be used for other purposes while supplying energy.
Explanation:
Both c and d are correct
It is easier to switch to solar and wind energy as compared to other alternative energy sources because they can be produced easily in areas with geothermal activity and can be used for other purposes while supplying energy.
What is solar energy?Solar energy is any type of energy generated by the sun. Solar energy can be harnessed directly or indirectly for human use.
Generating energy that produces no greenhouse gas emissions from fossil fuels and reduces some types of air pollution.
Diversifying energy supply and reducing dependence on imported fuels. Creating economic development and jobs in manufacturing, installation, and more.
Hence, options C and D are correct.
Learn more about the solar energy here:
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Substances A and B are combined. When combined, substance A, which is a black solid, sinks to the bottom of substance B which is a clear liquid. Based on this situation, which of the following is true.
A. Substances A and B formed a mixture
B. It is impossible to tell without more information
C. Substances A and B formed a compound
D. Substances A and B formed a new element
Answer:
c thats just what i do
Explanation:
Can you give me the answers to questions 28 and 29 please?
28. unbalanced because in reactant side the Aluminium is 1 and oxygen is 2 but in the product side the Aluminium is 2 and oxygen is 3 it is not equal so it is unbalanced equation
29. unbalanced because the oxygen atom are not equal in the reactant and the product side
Follow me pls!!
What ways is carbon added to the atmosphere
Answer:
One way is through fossil fuels. When people burn fossil fuels it enters the atmosphere as carbon dioxide gas. Another way is through animals. Most animals exhale carbon dioxide as a waste product which gets into the atmosphere.
According to the following reaction, how many moles of carbon dioxide will be formed upon the complete reaction of 28.6 grams of carbon monoxide with excess oxygen gas?
carbon monoxide (g) + oxygen (g) ----> carbon dioxide (g) + moles carbon dioxide
Explanation:
We have 2CO + O2 => 2CO2.
Moles of CO = 28.6g / (28g/mol) = 1.021mol.
Moles of CO2 = Moles of CO = 1.021mol.
How is thermal energy transferred during conduction? Check all that apply.
Thermal energy is transferred between particles that are not touching each other.
Thermal energy is transferred between particles that are in direct contact with each other.
Thermal energy is transferred between objects of different temperatures.
Themal energy is transferred between objects of the same temperature.
Themel energy is transferred from slow-moving particles to fast-moving particles.
Themal energy is transferred from fast-moving particles to slow-moving particles, .
Answer:
Option 2, 3, and also 6 btw
Explanation:
The other guy was wrong
Anyone Free can help me with this question please ?
Answer:
68
Explanation:
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a
What is the mollusk tongue called?
B
Answer:
why
Explanation:
B is the answer to the question
My question my question
H2O as an oxidant only
Further explanationGiven
Reaction
2 Na + 2 H2O → 2 NaOH + H2
Required
The function of water in the equation
Solution
Water : oxidizing agent
Na : reducing agent
Na⁰ → Na⁺ (oxidation)
H⁺- → H⁰ (reduction)
Acids and bases according to Bronsted-Lowry
Acid = donor (donor) proton (H⁺ ion)
Base = proton (receiver) acceptor (H⁺ ion)
If water is acting as an acid it should only give 1 H +, so that becomes:
H₂O (l) ⇔ OH⁻ (aq) not H₂
amount moles 167 g of nitrogen
You have 70 grams of aluminum. How many moles do you have
Answer:
70 moles is an Alluminium
A sample of oxygen occupies a volume of 150 cm3 at 72 C. What will be volume of oxygen when the temperature drops to 2 C?
Answer:
V₂ = 119.59 cm³
Explanation:
Given data:
Initial volume = 150 cm³
Initial temperature = 72°C
Final volume = ?
Final temperature = 2°C
Solution:
Initial temperature = 72°C (72 +273.15 K = 345.15 K)
Final temperature = 2°C (2 + 273.15 k = 275.15 K)
Solution:
According to the Charles Law.
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 150 cm³ × 275.15 K /345.15 K
V₂ = 41272.5 cm³.K / 298 K
V₂ = 119.59 cm³
Which describes a value for density