Answer:
300 mL
Explanation:
the unit formula of calcium phosphate is Ca3(PO4)2
molar mass of Ca3(PO4)2 = (3×40 + 2×31 + 8×16) g/mol = 310 g/mol
n = m/M = 35 g/(310 g/mol)
c = n/V
V = n/c = [35 g/(310 g/mol)]/0.375 mol/L
V = 0.30 L = 300 mL
Because fresh water is constantly be evaporated from the ocean and then replaced by rivers, the salinity of the oceans ____.
A.increases
B.doubles
C.remains balanced
D. decreases
Answer: Because fresh water is constantly be evaporated from the ocean and then replaced by rivers, the salinity of the oceans remains balanced.
Explanation:
When evaporation takes place in sea water then of course there will occur an increase in salinity.
But as this evaporated water is replaced by water coming from rivers. As a result, the raising salinity is counter balanced by the water coming from rivers.
Hence, salinity remains balanced in sea water.
Thus, we can conclude that because fresh water is constantly be evaporated from the ocean and then replaced by rivers, the salinity of the oceans remains balanced.
What is the empirical
formula for a compound that is 69.8% Fe
and 30.2% 0?
Answer:
Fe2O3
Explanation:
Help I’ll mark brainliest
Answer:
A and C
Explanation:
both stay the same in every experiment
How many moles are in 24.3g of iron (II) oxide?
Mark me Brainliest..... ......
What is an example of a biotic factor in an environment?
Answer:
A biotic factor is a living organism that shapes its environment. In a freshwater ecosystem, examples might include aquatic plants, fish, amphibians, and algae. Biotic and abiotic factors work together to create a unique ecosystem.
Answer:
A FWOGGY!
Explanation:
hey mid! how ya doin?
Which types of wave are used to support the theory that galaxies are expanding
Visible Spectrum
Explanation:
which uses red shift to indicate objects making away while the blue shift indicates objects moving down.
A sample of He gas in a 2 L container has a pressure of 6 atm. The He is moved into a 3 L container of Ne gas at 8 atm. What is the total pressure of the 2 gases in the 3 L container?
Answer:
yhcdun vfggcbnjj. bhh hjb jnnn k inv
why are cells called the smallest functional unit of a living organism?
A football is inflated to 12psi at 20°C What is the new pressure in the football
when the temperature is lowered to -5C
Answer: The new pressure is 3 psi.
Explanation:
Given: [tex]P_{1}[/tex] = 12 psi, [tex]T_{1} = 20^{o}C[/tex]
[tex]P_{2}[/tex] = ?, [tex]T_{2} = 5^{o}C[/tex]
Formula used is as follows.
[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\\\frac{12 psi}{20^{o}C} = \frac{P_{2}}{5^{o}C}\\P_{2} = \frac{12 psi \times 5^{o}C}{20^{o}C}\\= 3 psi[/tex]
Thus, we can conclude that the new pressure is 3 psi.
help a girl out please :)
Answer:
94.4mg is the answer.
Explanation:
mass of gold = 0.175g = 175mg
no. of moles = given mass / relative atomic mass
n = 175/197
n = 0.888 mol.
From the equation, mole ratio of Gold to Chlorine is 2:3
moles of chlorine = 1.5 × 0.888 = 1.33
no. of moles (chlorine) = mass/(35.5 × 2)
1.33 = m/71
m = 94.4mg
∴ mass of chlorine = 94.4mg
What type of reaction occurs without the addition of heat?
Answer:
A
Explanation:
A spontaneous reaction doesn't require any addition of heat.
The rest of the choices require a transfer of heat energy.
11. Write each step of uranium-240 undergoing first an alpha decay then two rounds of beta decay.
Pls HURRY HELPPP MEEEE
lanation:
ExpErnest Rutherford’s experiments involving the interaction of radiation with a magnetic or electric field (Figure 2) helped him determine that one type of radiation consisted of positively charged and relatively massive α particles; a second type was made up of negatively charged and much less massive β particles; and a third was uncharged electromagnetic waves, γ rays. We now know that α particles are high-energy helium nuclei, β particles are high-energy electrons, and γ radiation compose high-energy electromagnetic radiation. We classify different types of radioactive decay by the radiation produced.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
210
84
Po
⟶
4
2
He
+
206
82
Pb
or
210
84
Po
⟶
4
2
α
+
206
82
Pb
Submit two compounds that will correspond to the unknown compound in the equation.
balance this equation:
AsCl3(aq) +__H2S (aq)--> __As2S3(s) + ___HCl (aq)
How does H3PO ionize in water ?
Are these done correctly ?
HNO3 → H + NO3
H2SO4 → H2 + SO4
Answer:
H3PO4 + H2O ↔ [tex]H^{+}[/tex] + [tex]H2PO4^{-}[/tex]
Explanation:
HNO3 → NO2 + H2O + O2
H2SO4 → SO3 + H2O + O2
How many moles of H2 can be made from complete reaction of 3.0 moles of Al?
Given: 2 Al + 6 HCI - 2 AlCl3 + 3 H2
Answer: 4.5 moles of [tex]H_{2}[/tex] can be made from complete reaction of 3.0 moles of Al.
Explanation:
The given reaction equation is as follows.
[tex]2Al + 6HCl \rightarrow 2AlCl_{3} + 3H_{2}[/tex]
This shows that 2 moles of Al reacts with 6 moles of HCl. So, the amount of HCl required to react with 1 mole Al is three times the amount of HCl.
Therefore, 3 moles of Al will react with 9 moles of HCl to give 3 moles of [tex]AlCl_{3}[/tex] and [tex]\frac{9}{2}[/tex] moles of [tex]H_{2}[/tex].
The reaction equation now will be as follows.
[tex]3Al + 9HCl \rightarrow 3AlCl_{3} + \frac{9}{2}H_{2}[/tex]
The moles [tex]\frac{9}{2}[/tex] can also be written as 4.5 moles.
Thus, we can conclude that 4.5 moles of [tex]H_{2}[/tex] can be made from complete reaction of 3.0 moles of Al.
4.5 moles of H2 can be made from complete reaction of 3.0 moles of Al with hydrogen chloride.
STOICHIOMETRY:
According to this question, aluminum reacts with hydrogen chloride to form aluminum chloride and hydrogen gas as follows:2Al + 6HCI → 2AlCl3 + 3H2Based on this equation, 2 moles of aluminum (Al) reacts to produce 3 moles of hydrogen gas. Hence, 3 moles of aluminum will produce (3 × 3)/2 = 4.5 moles of hydrogen gas. Therefore, 4.5 moles of H2 can be made from complete reaction of 3.0 moles of Al with hydrogen chloride.Learn more about stoichiometry at: https://brainly.com/question/22288091?referrer=searchResults
NO LINKS I WILL REPORT IT!
Identify the gas law that
applies to the following scenario: When setting up the decoration for a marathon, a volunteer decides to inflate the balloons inside
an air conditioned trailer. The balloons increased slightly in volume when she when to set them up outside.
• Gay-Lussac's Law
Boyle's Law
Charles' Law
Avogadro's Law
8)
The animals in the food web release
into the environment, which plants then use for
A)
oxygen respiration
B)
carbon dioxide respiration
water vapor photosynthesis
D)
carbon dioxide photosynthesis
Answer:
Carbon dioxide photosynthesis
Explanation:
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.
hope it helps
How does the energy in chemical bonds affect the energy in a chemical reaction?
Answer:
Is by comparing the energy absorbed when bonds in the reactants are broken with the energy released when bonds in the products are formed, you can determine whether a chemical reaction releases energy or absorbs energy overall. Chemical reactions that release energy are called exothermic
Which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid?
A) Both elements in the compound are metals.
B) The atomic masses of the elements in the compound are relatively small.
C) There is equal sharing of electrons between the atoms of the elements in the compound.
D) The electronegativity difference between the elements in the compound is relatively large.
Answer:
There is ionic bonding between Mg2+ ions and NO3− ions. Which of the following claims about a binary compound in which the bonding is ionic is most likely to be scientifically valid? Both elements in the compound are metals.
Answer:
The answer is D.
Explanation:
A: not correct: one element is a metal and the other is a non-metal.
B: not correct: Fr could be combined with Cl
C: not correct: They are transferred not shared.
D: correct: Non-metals have a higher electronegativity in comparison to the metals with a low electronegativity which results in a great change in electronegativity.
El metal Mg reacciona con el Hcl para producir gas Hidrógeno Mg +2HCl---MgCl2 + H2. ¿Qué volumen en Litros de H2 en condiciones STP se liberan cuando reaccionan 8.25g de Mg? * 8.60L 6.60L 7.60L 16.60L
Answer: 7.60 L of hydrogen gas will be liberated.
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of Mg = 8.25 g
Molar mass of Mg = 24.305 g/mol
Plugging values in equation 1:
[tex]\text{Moles of Mg}=\frac{8.25g}{24.305g/mol}=0.340mol[/tex]
The given chemical equation follows:
[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]
By the stoichiometry of reaction:
If 1 mole of magnesium produces 1 mole of hydrogen gas
So, 0.340 moles of magnesium will be produce = [tex]\frac{1}{1}\times 0.340=0.340mol[/tex] of hydrogen gas
At STP conditions:
1 mole of a gas occupies 22.4 L of volume
So, 0.340 moles of hydrogen gas will occupy = [tex]\frac{22.4L}{1mol}\times 0.340mol=7.60L[/tex] of hydrogen gas
Hence, 7.60 L of hydrogen gas will be liberated.
PLS help its not that hard but I don't understand it. Its science not chemistry but they don't have science.
In this activity, you will construct two solar ovens and use thermometers to determine which oven gets the hottest. What engineering problem are you trying to solve?
Answer:
Conservation of resources. Saving energy and helping reduce carbon emission.
Explanation:
Se mezclan por error 70 mililitros de solución de HCl 0.5 Normal con 250 mililitros de solución de hidróxido de sodio 0.30 normal. Calcular: El volumen final de la solución resultante El carácter de la solución resultante La concentración final de la solución resultante El pH de la solución resultante El valor del pOH de la solución resultante
Answer:
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What do faults mean? I can see if people write it on goo gle btw.anddddddf short answers only please
Answer:
faults are wrong or disallowed options or suggestions.
7. What are the chemical formulas for water and calcium chloride?
Answer:
water: H2O
Calcium Chloride: CaCl2
water and calcium chloride: Ca(OH)2 + HCl
Explanation:
CaCl2 + H2O = Ca(OH)2 + HCl
Answer:
Water is H20
Calcium Chloride is CaCI2
Which of the following statements is true about acids?
A. Acids taste sour.
B. Acids conduct electricity when dissolved in water.
C. Acids turn blue litmus paper red.
D. Acids donate protons or H+ ions.
E. All of the Above
Answer:
It's (D)
Explanation:
Most acids taste sour, conduct electricity when dissolved in water, turn blue litmus
Most acids taste sour, conduct electricity when dissolved in water, turn blue litmuspaper red, but not all of them. Some acids taste bitter, others sweet and some simply delicious.
Most acids taste sour, conduct electricity when dissolved in water, turn blue litmuspaper red, but not all of them. Some acids taste bitter, others sweet and some simply delicious.Silicic acid is tasteless, is not soluble in water, does not conduct electricity, does not turn blue
Most acids taste sour, conduct electricity when dissolved in water, turn blue litmuspaper red, but not all of them. Some acids taste bitter, others sweet and some simply delicious.Silicic acid is tasteless, is not soluble in water, does not conduct electricity, does not turn bluelithmus paper red, since it merely does not dissociate in water. The only correct option is D
Explain why a solid expands when is is heated
Answer:
When a solid object is heated, it expands. This happens because the atoms in the object start vibrating or moving faster.
Explanation:
If you need a longer explanation, let me know! If not, I hope I helped.
What TWO things decide the amount of kinetic energy an object can have?
Answer:
Mass SpeedExplanation:
The energy transferred is known as kinetic energy, and it depends on the mass and speed achieved. Kinetic energy can be transferred between objects and transformed into other kinds of energy. Additionally, The faster an object moves, the more kinetic energy it has. The more mass an object has, the more kinetic energy it has.
Un elemento tiene 3 orbítales desapareados y presenta 3 niveles de
energía. ¿A qué grupo y período peretenece?
a) IIIA, 3 b) IIIB, 3 c) VIA, 3 d) VB, 3 e) VA, 3
1) What is the value of G at 120.0 K for a reaction in which H = +35 kJ/mol and S = 1.50
kJ/(mol.K)?
Answer:
ΔG = -145kJ/mol
Explanation:
To solve this question we must use the change in Gibbs free energy:
ΔG = ΔH - TΔS
Where ΔG is change in Gibbs free energy = ?
ΔH is enthalpy change = +35kJ/mol
T is absolute temperature = 120.0K
And ΔS is change in entropy = 1.50kJ/molK
Replacing:
ΔG = 35kJ/mol - 120.0K*1.50kJ/molK
ΔG = 35kJ/mol - 180kJ/mol
ΔG = -145kJ/mol