Answer:
about 79% (79.04369332 to be exact)
Explanation:
Percent composition=(Molar mass of element x amount of it)/Molar mass of compound x 100
Br= 3 x 79.9/303.25 x100=79.04369332
Which statement does NOT describe a relationship shown in the food web?
A Elk are prey for mountain lions.
B Mice are herbivores that consume grasses and are preyed on by snakes.
COwls prey on rabbits and frogs.
Rabbits consume shrubs and are parasites of grasses.
D
PLEASE HELP
True or false Compounds link up to make elements
Answer:
false
compound are formed from elements .
Help pwease!!!!!!!!!!!!!!!
Answer:
B
Explanation:
I think its water desposits clay in thick , flat layers because the way how a clay feels.
What is the mass in grams of 0.94 moles of sodium bicarbonate. NaHCO3?
Mass of a substance = Moles of a substance × molar mass of a substance
We have 0.94 moles of NaHCO3. The molar mass of NaHCO3 is the sum of the atomic masses of the elements comprising NaHCO3, which is approximately 84.007 g/mol.
The mass of 0.94 moles of sodium bicarbonate is therefore (0.94 moles NaHCO3)(84.007 g NaHCO3/mol NaHCO3) = 78.97 ≈ 79 grams of sodium bicarbonate.
_________deep-sea currents that occur because of differences between the salinity and temperature characteristics of water masses
Lesson 2.12
Question 3 options:
Density
Thermohaline currents
Salinity
Polar ice caps
Answer:
its B) Thermohaline currents Sorry if its wrong but im sure this could be it
Explanation:These deep-ocean currents are driven by differences in the water's density, which is controlled by temperature (thermo) and salinity (haline). This process is known as thermohaline circulation. In the Earth's polar regions ocean water gets very cold, forming sea ice.
Thermohaline currents deep-sea currents that occur because of differences between the salinity and temperature characteristics of water masses
What is thermohaline currents?Thermohaline currents is also known as 'the ocean conveyor belt' or 'the global conveyor belt'. It is a part of the large scale ocean circulations.
As the name thermohaline suggested that, 'thermo' means heat and 'haline' refers to the salt content. So, when there is a great difference in the temperature and the salt content deep sea currents occur.
Hence option (2) is correct i.e. thermohaline currents occur due to temperature and salinity difference.
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Calculate the number of moles of NaOH contained in 250. mL of a 0.05M solution.
Answer:
0.0125mol
Explanation:
Molarity (M) = number of moles (n) ÷ volume (V)
n = Molarity × Volume
According to this question, a 0.05M solution contains 250 mL of NaOH. The volume in litres is as follows:
1000mL = 1L
250mL = 250/1000
= 0.250L
n = 0.05 × 0.250
n = 0.0125
The number of moles of NaOH is 0.0125mol.
In the future the universe will most likely
Answer:A
Explanation: The universe is always expanding at all times. It dosnt expand that much though, very little
Determine the final temperature of a mixture of 50 grams of water at 10 C added to 120 grams of water at 80 C. Show all work. Use the simulator to check your answer. (Hint: This is a weighted average.)
Answer: 59.41
Explanation:
The final temperature of the system has been 130[tex]\rm ^\circ C[/tex].
Specific heat can be defined as the amount of heat required to raise the temperature of 1 g of substance by 1-degree celsius.
The amount of heat lost and the heat gained have been equal.
Heat = mass × specific heat × change in temperature
Thus,
mc[tex]\Delta[/tex]T = mc[tex]\Delta[/tex]T
50 g × (10 - x) = 120 × (x - 80)
500 - 50x = 120x - 9600
70x = 9100
x = 130
Thus, the final temperature of the system has been 130[tex]\rm ^\circ C[/tex].
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.
7)
A 1-gram sample of which substance in a sealed 1-liter container will occupy the container
completely and uniformly?
A)
H2O(g)
B)
H2000)
C
Hg(0)
D)
Ag(s)
Answer:A) H20 gas
Explanation:
Based on the property of gases, 1-gram sample of hydrogen gas, H₂ in a sealed 1-liter container will occupy the container completely and uniformly.
What is the nature of a gas?Gases are one of the states of matter.
Gas molecules have negligible forces of attraction between them, therefore, they are always in motion.
Gases do not have a specific shape or volume, rather they fill up every available space in their container.
Of the given option, only H₂ is a gas.
Therefore, 1-gram sample of hydrogen gas, H₂ in a sealed 1-liter container will occupy the container completely and uniformly.
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5. Now you want to know the distance in AU to each place where
you will be traveling. That way, you can relate each distance to our
solar system. What conversion factor will you need to multiply by to
convert kilometers to AU? (Hint: 1 AU = 149,598,000 km)
Answer:
Multiply the length value by 6.68456e-9
Explanation:
The question involves converting from one unit (kilometers) to another unit (Au)
From the question;
149,598,000 km = 1 AU
1 km = x
Cross multiplying;
1 * 1 = x * 149,598,000
1 = 149,598,000x
x = 1 / 149,598,000
x = 6.68456e-9
To convert kilometer to Au; Multiply the length value by 6.68456e-9
Which element would you predict to have the highest first ionization energy? Why?
a) neon or carbon
b) fluorine or francium
c) beryllium or strontium
d) iodine or fluorine
When a piece of copper metal at 100ºC was placed into a cup of water at 25ºC, the final temperature of both substances reached 30ºC within a minute. Which of the following statements is TRUE about the transfer of energy between the two substances?
A. Copper lost less energy than the amount of energy gained by water
B. Copper lost more energy than the amount of energy gained by water
C. Copper lost the same amount of energy that was gained by water
D. Copper gained the same amount of energy that was lost by water
Answer:
imma say C or D
Explanation:
Using the equation below, calculate the percent yield of H3PO4 if an experiment that started with 12.98 grams of HCl and excess Na3PO4 yielded 8.42 g of H3PO4. Please round to the nearest 0.01 and remember units and substance.
Na3PO4 + HCl --> NaCl + H3PO4
HELP! WILL MARK BRAINLYEST!!
The following formula d/t is used for calculation what?
The formula is used for calculating speed. D stands for distance, T stands for time. Full formula is S=D/T
How many atoms of oxygen in the chemical formula 2Ca(ClO2)2?
2
4
6
8
Answer:
D.
Explanation:
Balance the equation:
C6H1206 + 02 → CO2 + H2O
Answer:
c6h12o6 + 6o2 = 6co2 + 6h20
Explanation:
c6h12o6 + 6o2 = 6co2 + 6h20
0 = 18 18
h = 12 12
c = 6 6
What is the chemical equation?
Electrolysis (splitting) of water.
H20-->
Answer:
hydrogen(H2) and oxygen gas(O2
What is the unit of measurement for potential electric energy existing between two points on a circuit?
A. Joule
B. Voltage
C. Current
Fe2O3 (s) + 2 Al (s) ---> 3 Fe (l) + Al2O3 (s) Based on the thermite reaction, how much aluminum oxide (Al2O3) is formed from 8.0 grams of aluminum (Al)?
Answer:
15.3 g
Explanation:
Fe₂O₃ (s) + 2Al (s) → 3Fe (l) + Al₂O₃ (s)First we convert 8.0 grams of aluminum into moles, using its molar mass:
8.0 g Al ÷ 27 g/mol = 0.30 mol AlThen we convert 0.30 moles of aluminum into moles of aluminum oxide, using the stoichiometric coefficients:
0.30 mol Al * [tex]\frac{1molAl_2O_3}{2molAl}[/tex] = 0.15 mol Al₂O₃Finally we convert 0.15 moles of Al₂O₃ into grams, using its molar mass:
0.15 mol Al₂O₃ * 102 g/mol = 15.3 g Al₂O₃What is the % of each element in (NH4)2(SO4)?
Nitrogen=21.1999%
Hydrogen=6.1023%
Sulfur=24.2660%
The percent composition of nitrogen, hydrogen, sulfur , oxygen in ammonium sulfate is 21.18%, 6.05%,24.21%,48.43% respectively.
What is percent composition?The percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of solute/mass of solution ×100.It helps in elemental analysis of a given compound by giving proportions in which they are present.
Percent composition of N= 28/132.14×100=21.18%
Percent composition of H=8/132.14×100=6.05%
Percent composition of S=32/132.14×100=24.21%
Percent composition of O=64/132.14×100=48.43%.
Thus, the percent composition of nitrogen, hydrogen, sulfur , oxygen in ammonium sulfate is 21.18%, 6.05%,24.21%,48.43% respectively.
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example of gases collected through upward delivery
Answer:
In this process The more dense gases are collected in a gas jar. Carbon dioxide, Nitrogen dioxide are collected by this way. Air is displaced upward thus, this process is known as upward delivery
Hope it helped :)
(Help would be greatly appreciated) Which sweet tea would you expect to taste the sweetest?
1. 1M
2. 3M
3. 3.1M
4. 2.5M
Answer:
3.1 M
Explanation:
3.1 M has the highest concentration of sweet tea so it should taste the sweetest.
How many moles of gas are contained in a 50.0 L cylinder at a pressure of 100.0 atm and a temperature of 35.0°C?
Answer:
n = 2 moles (1 sig-fig)
Explanation:
Using the Ideal Gas Law equation (PV = nRT), solve for n (= moles) and substitute data for ...
pressure = P(atm) = 100atm
volume =V(liters) = 50L
gas constant = R = 0.08206L·atm/mol·K
temperature = T(Kelvin) = °C + 273 = (35 + 273)K = 308K
PV = nRT => n = PV/RT = (100atm)(50L)/(0.08206L·atm/mol·K)(308K)
∴ n(moles) = 1.978moles ≅ 2 moles gas (1 sig-fig) per volume data (= 50L) that has only 1 sig-fig. (Rule => for multiplication & division computations round final answer to the measured data having the least number of sig-figs).
Moles are the ratio of the mass and the molar mass of the substance. In a 50.0 L cylinder, 2 moles of gas are present at 100 atm and 35 degrees celsius.
What is an ideal gas equation?An ideal gas equation states the relationship between the moles of the substance, temperature, pressure, and volume. The ideal gas equation is given as,
[tex]\rm PV = nRT[/tex]
Given,
The pressure of the gas (P) = 100.0 atm
Volume of the gas (V) = 50.0 L
Temperature (T) = 308 K
Gas constant (R) = 0.08206 L atm/mol K
Substituting values in equation moles (n) is calculated as:
[tex]\begin{aligned} \rm n&= \rm \dfrac{PV}{RT}\\\\&= \dfrac{100 \times 50}{0.08206 \times 308}\\\\&= 1.978\end{aligned}[/tex]
Therefore, 1.978 or 2 moles of gas are present.
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Which system controls organs in times of stress?
Answer:
The autonomic nervous system has a direct role in physical response to stress and is divided into the sympathetic nervous system (SNS), and the parasympathetic nervous system (PNS). When the body is stressed, the SNS contributes to what is known as the “fight or flight” response.
Explanation:
What volume of a 0.100 M AgNO3 solution is required to completely react with the CaCl2 in 3.00 L of a 0.100 M CaCl2 solution? The balanced chemical equation is: 2 JUpper A g upper N upper 0 subscript 3 plus upper C a upper C l subscript 2 right arrow 2 upper A g upper C l plus upper C a (upper N upper O subscript 3) subscript 2. L AgNO3
Answer:
6.00 LAgNO3
Explanation:
Got it right on Edge. :)
Answer:
B
Explanation:
In the reaction below identify the products. CH4 + 202 --> CO2 + 2H2O
Answer:
CO2 and H20
Explanation:
The products are on the right hand side of the equation.
I’ll really appreciate it if you help me out on this one .
The effective nuclear charge of a neutral atom aluminum, Al with atomic number 13 is
Answer:
wala hindi ko yan alam ty
PLEASE HELP.!
While studying meiosis and mitosis for her genetics test, Marisa made notes of the kinds of cells produced from these processes with examples from the body. Which pairing of the cell produced during meiosis and example is correct?
A) diploid cell: liver cell
B) diploid cell: sperm cell
C) haploid cell: egg cell
D) haploid cell: hair cell
Answer:
C
Explanation:
The pairing of the cell produced during meiosis and correct example is haploid cell: egg cell (Option C).
A haploid (n) cell contains only a set of homologous chromosomes, whereas a diploid (2n) cell contains two sets of homologous chromosomes. Meiosis is a type of reductional cell division by which a parental diploid (2n) cell generates four haploid germinal (egg) daughter cells having half of the genetic material.Conversely, mitosis is a type of cell division that produces two genetically identical daughter cells.Meiosis produces germinal (sex) cells, whereas mitosis produces somatic (body) cells.In conclusion, the pairing of the cell produced during meiosis and correct example is haploid cell: egg cell (Option C).
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1. Define action energy.
Answer:
In physics, action is an attribute of the dynamics of a physical system from which the equations of motion of the system can be derived through the principle of stationary action. ... Action has dimensions of energy⋅time or momentum⋅length, and its SI unit is joule-second.
Explanation:
hope it helps
Answer:
Action is an attribute of the dynamics of a physical system from which the equations of motion of the system can be derived through the principle of stationary action.
Explanation: