Answer:
a. 53.3°C.
b. Percent error for both students is 53.3°C
c. Both students are equal in accuracy.
2nd student is most precise
Explanation:
The percent error is defined as:
|M - T| / T * 100
Where M is measurement,
and T is theoretical value
a. To obtain the average of both measurements we need to sum the measurements and divide these in the number of measurements:
51.5°C+53.5°C+55.0°C+52.3°C+54.2°C+52.3°C+53.2°C+54.0°C+53.5°C / 9
= 53.3°C
b. Percent error for 1st student:
51.5°C+53.5°C+55.0°C+52.3°C+54.2°C / 5 = 53.3°C
|53.3°C - 53.0°C| / 53°C * 100
0.57%
Percent error for 2nd student:
52.3°C+53.2°C+54.0°C+53.5°C / 4 = 53.3°C
|53.3°C - 53.0°C| / 53°C * 100
0.57%
c. Now, precision is how close are the measurements to each other and the accuracy how close are the measurements to the theoretical value:
The accuracy is obtained with percent error, the lower percent error the most accurate measurement. That means:
both students are equal in accuracy.
And precision is obtained with relative standard desviation.
Desviation standard / Average * 100
(We can solve the standard desviation in a scientific calculator):
1st student:
2.65%
2nd student:
1.34%
The lower RSD the most precise measurements.
2nd student is most preciseWhich is composed of aromatic hydrocarbons?
clothing
barbeque fuel
pain relievers
O polyvinyl chloride
Answer:
the answer is pain relievers
Which is composed of aromatic hydrocarbons?
clothing
barbeque fuel
pain relievers
polyvinyl chloride
Pain relievers are composed of aromatic hydrocarbons. Therefore, option C is correct.
What are aromatic hydrocarbons ?Hydrocarbons with delocalized pi electrons and sigma bonds between their carbon atoms are known as aromatic hydrocarbons. One example is benzene. Since they smell, they are said to as aromatic.
One aromatic ring makes up monocyclic aromatic hydrocarbons (MAHs). The well-known environmental contaminants benzene, toluene, ethylbenzene, and xylenes are among the most combustible and water-soluble aromatic hydrocarbons (BTEX).
The typical aromatic parent structure is benzene. When the benzene ring is a substituent, it is referred to as a phenyl group.
Thus, Pain relievers are make up of aromatic hydrocarbons, option C is correct.
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4 Identify What are the starting materials
and products of photosynthesis and cellular
respiration?
Answer:
Detail is given below.
Explanation:
Photosynthesis:
Reactants = Carbon dioxide + water + energy
Products = glucose + oxygen
Chemical equation:
6H₂O + 6CO₂ + energy → C₆H₁₂O₆ + 6O₂
It is the process in which in the presence of sun light and chlorophyll by using carbon dioxide and water plants produce the oxygen and glucose.
water is supplied through the roots, carbon dioxide collected through stomata and sun light is capture by chloroplast.
Cellular respiration:
Reactants = Glucose + oxygen
Products = carbon dioxide + water + 38ATP
Chemical equation:
Glucose + oxygen → carbon dioxide + water + 38ATP
It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.
Which air is driest?
Air Temp 66F Dew-point 60F
Air Temp 77F Dew-point 19F
Air Temp 50F Dew-point 36F
Air Temp 30F Dew-point 29F
Answer: 2nd option
Explanation: took the quizz
plsss helpppp
im confused i dont know the answer
pls
N and C
_____________________________________WHY OPTION A?Because Lithium and Sodium belong to group 1A whereas Magnesium is from group 2A, which are S block elements and they form ionic bond.
_____________________________________HOPE IT HELPS!Answer:
N and C
Explanation:
Os the right answer
Start moving, stop moving, speed up, slow down, and change direction are ways that motion can
change.
O True
O False
Answer:
This is true
Explanation:
Because motion can change due to its speen rate and direction change
PLEASE HELP.
1. Fossils of sea creatures have been found near the top of Mount Everest (8848m above the sea level). How do you think they could have got there?
2.How did Wegener work out what Pangea looked like? ( IN UR OWN WORDS PLS)
Answer:
Explanation:
Wegener figured out what Pangea looked like because he rearranged the continents, joining them so that the distribution of the fossils matched up across the continents.
How do slab pull forces affect plate motion? Choose the correct answer.
Uplifted mantle causes plates to move apart.
Convection currents drive the plate downward to move it.
Earthquakes break the crust into smaller plates to make motion easier.
The weight of the subducted plate produces a force to continue moving the plate.
Answer:
The weight of the subducted plate produces a force to continue moving the plate.
Explanation:
If the mass is 7150 kg, and the
acceleration is 2 m/s2, then what is the
force?
Explanation:
f= ma
f= 7150 *2
f= 14300N
The force will be equal to 14300N when the mass is 7150 kg and the
acceleration is 2m/s².
What is force?Force is an external agent that can change a body’s state of rest or motion. Force has a direction and a magnitude so it is a vector quantity. The SI unit of force is Newton and the unit used is Kgm/s².
Force can change the state of a body from rest to motion and can accelerate the speed of a moving body. The direction of a moving object can be changed by applying force.
The force is expressed by the product of the mass (m) and acceleration (a) of an object. The mathematical equation for force can be expressed in the form of:
F = ma
Given, the mass (m) = 7150 Kg and acceleration (a) = 2 m/s²
Then, force, F = (7150 Kg) × (2 m/s²)
F = 14300 Kgm/s²
or, F = 14300 N
Therefore, the force of the object will be equal to 14300 N.
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The rows in the periodic table are called periods.
What is true about elements in the same period?
A. They have the same atomic mass.
B. Their magnetism increases in strength from left to right.
C. Their atomic numbers increase by 1 from left to right.
D. They have similar chemical properties.
Answer: C
Explanation:
What is an ionic compound? Describe and give an example.
Answer:
Ionic compounds are compounds made up of ions. These ions are atoms that gain or lose electrons, giving them a net positive or negative charge. Metals tend to lose electrons, so they become cations and have a net positive charge. Ions of opposite charge are held together by very strong ionic bonds within the compound.
Explanation:
My explanation is above with the answer
Which indicates how evidence of climate change supports the theory of continental drift?
coal fields in several continents
volcano formation
glacial evidence found in South America
folded mountains in Africa and South America
Glacial evidence found in South America, do indicate how evidence of climate change has supports the theory of continental drift.
Climate change occurs daily all over the world. This is largely due to man's activities that has affected the atmosphere and the earth.Continental drift is simply known as the theory that states that the continents at a time has formed a single landmass, broke up, and drifted to their present locations. Glacial evidence in South America has made man to believe more in the continental drift hypothesis.Conclusively, we can therefore say that Glacial evidence found in South America, do indicate how evidence of climate change has supports the theory of continental drift.
Learn more from
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Answer:
glacial evidence found in South America
Explanation:
Calcium nitrate and calcium carbonate are both ionic compounds.
Calcium nitrate mixed with water behaves as an electrolyte.
Calcium carbonate mixed with water does not behave as an electrolyte.
Explain, in terms of solubility and movement of ions, this difference in behaviour
Answer:
Calcium nitrate is soluble in water and dissociate into ions whereas calcium carbonate is insoluble and water and do not form ions.
Explanation:
An electrolyte is a substance which conducts electricity in molten form or when dissolved in water.
The ability of an electrolyte to conduct electricity is due the movement of charged particles called ions. The ions are of two types: negatively charged ions called anions and positively charged ions called cations.
Calcium nitrate is a soluble in water, and when dissolved in water produces two ions; negatively charged nitrate ions,NO₃⁻, and positively charged calcium ions, Ca²⁺. These ions enable it to conduct electricity.
Calcium carbonate on the other hand is insoluble in water, and thus, do not produces any ions capable of carrying current.
A factory produces a certain chemical at a rate of 3.5 grams per second. How many kilograms of the chemical are produced each hour?
1 kilogram = 1.000 grams
1 hour = 3.600 seconds
Express the answer to the correct number of significant figures.
The factory produces
kilograms of the chemical per hour.
Answer:
12.6kg
Explanation:
3.5×3,600 then convert to kg
Isotopes of the same element have different numbers of
A protons
B neutrons
C neutrons and electrons
D protons and electrons
i need this ASAP i will give brainliest :)
Which term is defined as the ratio of the speed of light in a vacuum to the speed of light in the material it is passing through?
Answer:
I really dont know i just guessed :(
Explanation:
Answer:
index of refraction
Explanation:
y’all help me out i’m so dumb 3
which of the following can be agents of erosion? (alternate phrasing: which of the following can cause erosion)
moving water
wind
ice and glaciers
humans and animals
all of the above
If L = 5, then the magnetic quantum number "mL" can be equal to
a. -4, -3, -2, -1, 0, +1, +2, +3, +4
b. -5, -4, -3, -2, -1, 0, +1, +2, +3, +4, +5
c. 0, 1, 2, 3, 4
d. 0, 1, 2, 3, 4, 5
b. -5, -4, -3, -2, -1, 0, +1, +2, +3, +4, +5
Further explanationEach orbital in an atom consists of 4 quantum numbers
n is the principal quantum number.
l is the angular momentum / azimuthal quantum number
ml, the magnetic quantum number
ms, the electron-spin quantum number
Value of n: positive integer
value of l: s = 0, p = 1, d = 2, f = 3 , ..(n-1)
ml value: between -l to + l
ms value: +1/2 or -1/2
So for L=5, mL value : -5 to +5
How are oxidation states of transition metals indicated in the names of metal
compounds?
A. Prefixes are used to indicate oxidation states.
B. Group numbers are used to indicate oxidation states.
C. Roman numerals are used to indicate oxidation states.
D. Subscripts are used to indicate oxidation states.
Answer:
The anser is c
Roman numerals are used to indicate oxidation states. Hence, option C is correct.
What is the oxidation state?An oxidation state is a number given to the atom of an element when participating in a chemical reaction.
Roman numerals are used to indicate oxidation states of transition metals.
The names for transition metal compounds often have roman numerals in them, because the roman numerals indicate the charge on the transition metal. But the oxidation state of Cu in CuO is +2, and the oxidation state of Cu in [tex]Cu_2O[/tex] is +1. Name metal first and charge and transition metal with a roman numeral.
The transition metals may form more than one ion, thus it is needed to be specified which particular ion we are talking about. This is indicated by assigning a Roman numeral after the metal. The Roman numeral denotes the charge and the oxidation state of the transition metal ion.
[tex]Fe^{2+}[/tex] would be named iron (II) and [tex]Fe^{3+}[/tex] would be named iron (III).
Hence, option C is correct.
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PLEASE HELP!!! 1. What is the scientific name for the following compound using IUPAC rules?
H2O
Answer:
Wouldn’t it be Oxidane, water?
Please help... awarding 20 points and brainiest if correct.
Answer:
CH4
- 4 electron
- 0 electron
- the geometry of Ch4 is tetrahedral
AlF3
- 3 electron
- 0 electron
- the geometry is trigonal planar
CCl4
- 4 electron
- 0 electron
- the geomotry is tetrahedral
SeH2
- 2 electron
- 2 electron
- the geometry is V shape
7th grade help me plzzzzzzz
Answer:
15 atoms
increases
Explanation:
10 hydrogen atoms + 5 oxygen atoms = 15 atoms
(100 points) Atleast 5 slogans on saving fuel.
Answer:
Save Fuel, Save Earth
Fuel and time wait for none!
Be wise, don’t waste fuel
Save fuel, stop being cruel
Don’t contribute towards global warming
Care for future, save fuel
Hope That Helps!!!
Explanation:
Here are Best Slogans on Save Fuel.
-Towards a better future.
-Save to sustain.
-Save fuel for a better world.
-Make sure to keep some for the next generation.
-Our resources are limited.
-Save to expand.
-Saving fuel has no alternatives.
-Save money while saving fuels.
Choose the statement that is NOT true.
Hundreds of stars with planets have been confirmed using the radial velocity method and the transit method.
The first Earth-size planets ever found outside the solar system were discovered in 2012 by the Kepler Mission team.
Planets orbiting stars in the "habitable zone" are likely to have life existing on them.
More than 50% of the 100 billion stars in the Milky Way galaxy have at least one planet orbiting.
Answer:
More than 50% of the 100 billion stars in the Milky Way galaxy have at least one planet orbiting.
Explanation:
This is False so this would be your Answer
Answer: planets orbiting stars in the habitabke zone are likely to have life existinv on them
Explanation:
because it is false and i took the quiz
An ionic compound is
A.a salt
B.held together by a transfer of electrons
C.composed of anions and cations
D.held together by sharing of valence electrons
How many grams of nickel 58.69 (No,58.69 g/mol) are in 1.57 moles of nickel
Answer:
92.1
Explanation:
1.57 * 58.69
what further observation led mendeleev to create the periodic table
Answer:
;,knbbbknnbkhbln bhbj k; b; m j
Explanation:
can you help me ? directions at the top of the pic.. I only have 30 minutes to do it
Why do you think Earth's plates move on the surface?
Explanation:
heat in the Earth's core
What is the density of a 6 g of pure copper with a volume of 12 mL?
a 0.25 g/mL
b 1.5 g/mL
c 2.3 g/mL
d 0.5 g/mL
Answer:
The density of copper is 0.5 g/mL
Explanation:
Given data:
Mass of copper = 6 g
Volume of copper = 12 mL
Density of copper = ?
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
d = 6 g/ 12 mL
d = 0.5 g/mL
Thus, the density of copper is 0.5 g/mL
Electrons in Atoms
The (type here) of the atom is the most up-to-date model of the atom at this point.
generally speaking, the Bohr model encapsulates the modern understanding of the atom. This model is often depicted in artwork showing a central atomic nucleus and oval lines representing the orbits of the electrons.
Bohr
