A student measures the volume of a rock, and then repeats the measurement two times. For the three measurements to be very precise, what must be true about them?
A. The measurements must be very close to the true volume of the rock.
B. The measurements must be very close to one another.
C. At least one of the measurements must be equal to the true volume of the rock.
D. The three measurements must be reported in whole numbers, not decimals.
Answer:
i think b
Explanation:
A student measures the volume of a rock and then repeats the measurement two times. For the three measurements to be very precise the measurements must be very close to one another for rock. Option B is correct.
What is precise?While measuring something is the measured value is close to each other then the result measurement is said to be precise and the phenomena are called precision.
In the measurement of rock, the measured values must be close to each other and do not vary much then only the measurement of students can be precise.
Therefore, Option B is correct, the measurements must be very close to one another for the rock student measures the volume of a rock and then repeat the measurement two times. For the three measurements to be very precise.
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List two factors that affect climate
Answer:
1. Latitude
2. Ocean currents
Explanation:
Why do our liver cells contain so many smooth ER?
Answer:
Liver cells contain lots of smooth endoplasmic reticulum because the liver plays a big role in detoxification. So, if you've had a few too many glasses of wine, it's the smooth endoplasmic reticulum in your liver that's helping move things along the next morning
Explanation:
heelp plzzzzzzzz anyyyyyone
Answer: C
Explanation:
Is copper II chloride mixed with water an element, compound, or mixture? If it's a mixture is it homogeneous or heterogeneous?
Answer:
1. mixture
2. Homogenous
Explanation:
Copper II chloride is a compound because it consists of elements that are chemically combined together. When a solute in this case, copper II chloride is mixed with water- a solvent, the result is a homogenous mixture.
Homogenous substances are formed when a solute and a solvent combine, resulting in a mixture with uniform properties. Mixtures can be separated using relevant separation techniques.
Explain what a conjugate acid is and what a conjugate base is.
Answer:
A conjugate acid, within the Brønsted–Lowry acid–base theory, is a chemical compound formed when an acid donates a proton to a base—in other words, it is a base with a hydrogen ion added to it, as in the reverse reaction it loses a hydrogen ion
Explanation:
According to the A.P.E.X. glossary:
A conjugate acid is the form a base takes after it gains a hydrogen ion (or proton), and a conjugate base is the form an acid takes after it loses a hydrogen atom (or proton).
I'm giving 20 points! please it's for a friend not me
Answer:
Three chemical elements: hydrogen, oxygen, and helium.
The difference between metals and metalloids is: metalloids have properties in between those of the metals and non-metals and are semiconductors.
The periodic table is organized by the elemts atomic number, it goes from the element with the lowest atomic number (which is hydrogen) to the element with the highest atomic number (oganesson)
Explanation:
Hope this helps :)
Answer: Thank you for the points.
Explanation:
Sound Wave, Ripple in water, Guitar String, TV Signal, Which one does not belong? Why?
Answer:
The TV signal.
Explanation: Hope this is right! :)
2. (10 Points) If something has a high heat capacity will it take a little energy or a
lot of energy to change its temperature? Defend your answer.
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2 K + Cl2 → 2 KCI what type of chemical reaction is this
nvm nvm check comments
Answer:
C
Explanation:
Common sense no offense lol
3. To find an object's mechanical energy. you add its A kinetic and potential energy B kinetic and thermal energy C potential and thermale energy D kinetic and chemical energy
Answer:
A
Explanation:
The formula for mechanical energy is mechanical energy = kinetic energy + potential energy.
1.
a) If 1.08 g of sodium sulfate reacts with an excess of phosphoric acid, how much sulfuric acid is produced? (0.74577)
b) If 0.726 g of sulfuric acid is produced in the laboratory experiment, what is the percent yield of sulfuric acid? (97.3190)
2.
If 3.2 moles of sodium sulfate is used in the reaction, how many formula units of phosphoric acid is needed to completely react?
(1.28427×1024
Answer:
1. a) 0.745 g of H₂SO₄
b) 97.4%
2. 1.28×10²⁴ formula units
Explanation:
First of all, we determine the equations:
3Na₂SO₄ + 2H₃PO₄ → 3H₂SO₄ + 2Na₃PO₄
We determine, the moles of sodium sulfate. (As the acid is in excess, we work with the salt)
1.08 g . 1mol/ 142.04g = 0.00760 moles.
Ratio is 3:3. So 3 moles of salt can produce 3 moles of sulfuric acid,
Then, 0.00760 moles will produce the same amount of acid.
We convert the moles to mass → 0.00760 mol . 98 g/mol = 0.745 g
Percent yield = (Produced yield /Theoretical yield) . 100
(0.726 g / 0.745 g) . 100 = 97.4 %
2. 3 moles of sodium sulfate need 3 moles of phosphoric acid to react
Then, 3.2 moles of salt will react to (3.2 . 2)/3 = 2.13 moles
Let's count the formula units:
2.13 mol . 6.02×10²³ formula units /mol = 1.28×10²⁴ formula units.
how would I do this? thanks^^
my opinion is guess and hope Explanation:
Which of these is evidence that an unbalanced force is acting on an object?
The motion of the object is changing
The mass of the object is changing.
The object continues moving in a straight line
The object remains at rest.
Answer:
The motion of the object is changing
Explanation:
Objects will only change their motion (direction, speed) if there is an unbalanced force of some kind acting on them. Balanced forces result in no change in the object's state of motion.
The motion of the object is changing.
Objects will only change their motion (direction, speed) if there is an unbalanced force of some kind acting on them. Balanced forces result in no change in the object's state of motion.
What is motion ?
"Change with time of the position or orientation of a body. Motion along a line or a curve is called translation. Motion that changes the orientation of a body is called rotation."
What is force ?"A force is a push or pull upon an object resulting from the object's interaction with another object."
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Which atom has the lowest(smallest) ionization energy?
A. Na
B.K
C. Me
D. Ca
What happens to that atom of magnesium-24 if it GAINS a NEUTRON? *
Answer: If this atom loses one electron, it will become a cation with a 1+ charge
Explanation:
explain why the fingertip and not the palm of the hand is used to detect braille symbols
Answer:
The Braille is the dots arranged in cell to identify the letter, number and symbols. the Braille system is identified using the fingers. the fingertip is used for identifying the nature of number and symbol. the difference is made by detecting the number and symbol.
Explanation:
Hope this helped Mark BRAINLEST!!!!
is acidity always bad?
Answer:
depends on what you're talking about. Stomach acid benefits us, some fruits like oranges, lemons, and pineapples are acidic.
Explanation:
Answer:
No.
Explanation:
Prove this reaction is a redox reaction
3 Mg + 2 FeCl3 +2 Fe + 3 MgCl2
Your answer should include the half equations
Answer:
because Redox means two words:reduction and oxidation
reduction is when oxygen is taken from a substance while oxidation is the addition of oxygen to a substance..Magnesium displaces chlorine from iron(fe)because it is more reactive than iron
and iron gives chlorine to magnesium because it's less reactive.This is due to their position on reactivity series.
Explanation:
This is called displacement reaction where by A most reactive metal remove a substance from a less reactive metal and form up a salt
and in this case the salt formed in the reaction is 3MgCl
is the maximum population that a given area can support.
Carrying capacity
Population growth
Limiting factor
Immigration rate
The carrying capacity is the maximum number of individuals of a species that an environment can support. Population size decreases above carrying capacity due to a range of factors depending on the species concerned, but can include insufficient space, food supply, or sunlight.
I need help with 5 and 6!!
Answer:
As the axial tilt increases, then the seasonal contrast increases so that winters are colder and summers are warmer in both hemispheres. The northern hemisphere is tipped away from the Sun, producing short days and a low sun angle. What kind of effect does the earth's tilt and subsequent seasons have on our length of daylight (defined as sunrise to sunset). Over the equator, the answer is not much.
As for #5, it's mixed at the end of my answer, but just remember the spring equinox marks the change from 24 hours of darkness to 24 hours of daylight at Earth's poles .
How does the velocity of a falling object change over time?
Which part of the flower produces seeds? (992 points)
a
Ovule
b
Pistil
c
Stamen
d
Stigma
Answer:
The pistil, B.
Explanation:
The seeds are formed from the ovule which is contained in the ovary; all in the base, the pistil.
describe un modelo matemático para representar lo que sucede en cada una de las reacciones químicas (incluye toda la simbología que puedas) y clasifícalas según consideres de acuerdo con lo abordado en el tema.
1. El hidrógeno molecular reacciona con el oxígeno molecular y produce agua
2. El Óxido de calcio reacciona con el agua y produce hidróxido de calcio
3. El sulfuro de hierro (II) se produce cuando reacciona el azufre y el hierro en su forma atómica
4. El ácido sulfuroso se descompone por la acción de calor en dióxido de azufre gaseoso y agua
5. El carbonato de calcio se descompone por la acción de calor en oxido de calcio y dióxido de carbono gaseoso.
6. El magnesio reacciona con el ácido clorhídrico y produce dióxido de magnesio e hidrógeno gaseoso.
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Responder:
2H2 + O2 → 2H2O
CaO + H2O → Ca (OH) 2
Fe + S → FeS
H2SO3 → SO2 + H2O
CaCO3 → CaO + CO2
Explicación:
2H2 + O2 → 2H2O
2 moléculas de hidrógeno gaseoso reaccionan con oxigente para producir 2 moléculas de agua
CaO + H2O → Ca (OH) 2
El óxido de calcio reacciona con el agua para producir hidróxido de calcio.
Fe + S → FeS
El hierro reacciona con el azufre para producir sulfuro de hierro.
H2SO3 → SO2 + H2O
Por descomposición, el ácido sulfuroso se descompone para producir dióxido de azufre y agua.
CaCO3 → CaO + CO2
El carbonato de calcio se descompone para producir óxido de calcio y dióxido de carbono.
_N2+_F2→ _NF3
What goes inside the blanks
Typically, your percent yield is ______ than 100% because ___________________________.
Reasons why percent yield is more than 100
Typically, percent yields are understandably less than 100% because of the reasons indicated earlier. However, percent yields greater than 100% are possible if the measured product of the reaction contains impurities that cause its mass to be greater than it actually would be if the product was pure.
figure it out
Answer:
Explanation:
A
You have 1 1/2 moles of 1 kg bottles of O2. What is the mass of O2 that you have? A. 9.033x10^23 kg B. 9.033x10^23 atoms C. 1.80x10^27 kg D. 1.806x10^24 moles
Answer:
b
Explanation:
trust
Answer:
B
Explanation:
1. (10 Points) When you boil water in a pan on the stove which heats faster the
pan or the water? Defend your answer.
The pan would heat faster because in order for the water to get hot the pan needs to be hot as well.
How many moles of NaCl can be made from 16 moles of Na?
La densidad del aire contenida en una habitación es 0.0013 g/cm3. si las dimensiones de la habitación son 4m de ancho, 5m de largo y 2.5m de alto, ¿ que nada tiene el aire contenido?
Answer:
La masa del aire contenido en la habitacion es 65000 gramos.
Explanation:
La densidad se define como la propiedad que tiene la materia, ya sean sólidos, líquidos o gases, para comprimirse en un espacio determinado. En otras palabras, la densidad es una magnitud que permite medir la cantidad de masa que hay en determinado volumen de una sustancia. Entonces, la expresión para el cálculo de la densidad es el cociente entre la masa de un cuerpo y el volumen que ocupa:
[tex]d=\frac{m}{V}[/tex]
En este caso:
d= 0,0013 [tex]\frac{g}{cm^{3} }[/tex]m=?V= 4 m*5 m*2,5 m= 50 m³= 50.000.000 cm³ (siendo 1 m³=1.000.000 cm³)Reemplazando:
[tex]0,0013\frac{g}{cm^{3} }=\frac{m}{50000000 cm^{3} }[/tex]
Resolviendo obtienes:
m= 0,0013 [tex]\frac{g}{cm^{3} }[/tex] * 50.000.000 cm³
m=65000 g
La masa del aire contenido en la habitacion es 65000 gramos.