The molar concentration of the original HF solution : 0.342 M
Further explanation
Given
31.2 ml of 0.200 M NaOH
18.2 ml of HF
Required
The molar concentration of HF
Solution
Titration formula
M₁V₁n₁=M₂V₂n₂
n=acid/base valence (amount of H⁺/OH⁻, for NaOH and HF n =1)
Titrant = NaOH(1)
Titrate = HF(2)
Input the value :
[tex]\tt 0.2\times 31.2\times 1=M_2\times 18.25\times 1\\\\M_2=0.342[/tex]
A 5.00 g sample of a pure substance powder is heated, and the powder leaves 4.63g of a shiny, metallic liquid. Is the powder an element or a compound? Explain
Answer:
compound
Explanation:
We already know that the original substance was pure. If this substance was pure and it was powdery in nature then we have a footing to start from.
Secondly, a 4.93 g of shinny metallic liquid was left behind. This shinny metallic liquid must be an element.
Since there was a loss in mass during heating, it follows that there were other components of the pure powder.
If the reasoning stated above is correct, then the substance is a compound.
Which compound would be classified as a covalent bond
A. KI
B. CaCl2
C. P2O5
D. MgO
Answer:
Explanation:
Examples of compounds that contain only covalent bonds are methane (CH4), carbon monoxide (CO), and iodine monobromide (IBr). Covalent bonding between hydrogen atoms: Since each hydrogen atom has one electron, they are able to fill their outermost shells by sharing a pair of electrons through a covalent bond
The compound that is classified as covalent bond is P₂O₅
The correct answer to the question is Option C. P₂O₅
Covalent bond is a type of bond in which there is a sharing of electron(s) between the atoms involved. Compounds formed by this type of bond are called covalent compounds.
Covalent bond exist between non metals only
With the above information in mind, we can conclude that P₂O₅ is a covalent compound as both phosphorus and oxygen are non metals.
The rest options in the question contains metal and non metals.
The correct answer to the question is Option C. P₂O₅
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Distance and mass are factors that affect the force of
Answer:
Gravity is a fundamental underlying force in the universe. The amount of gravity that something possesses is proportional to its mass and the distance between it and another object.
Explanation:
Hope it helped, brainliest???
I have a project and I need help with a diagram. What do the moon, sun, and earth look like at night in the Americas? (diagram)
Answer: Hope This Helps
Explanation:
How many strawberries would you need to make 12 smoothies?
Answer: Hey! You need 48 Strawberries to make 12 smoothies.
Explanation: I knew this before but needed to make sure if it's true. So I tested it by myself and got it!
You are very welcome!
You need 84 strawberries to make 12 smoothies.
What is multiplication?Multiplication is a mathematical arithmetic operation. It is also a process of adding the same types of expression for some number of times.
Example - 2 × 3 means 2 is added three times, or 3 is added 2 times.
Given:
Martha needs 28 strawberries to make 4 smoothies.
To make one smoothie,
Martha needs = 28/4 = 7 strawberries.
To make 12 smoothies,
Martha needs = 12 x 7
= 84 strawberries.
Therefore, you need 84 strawberries.
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The complete question:
Martha needs 28 strawberries to make 4 smoothies.
How many strawberries would Martha need to make 12 smoothies?
but in your own words
Answer:
gametes are sperm and an egg individually. when the gametes come together and fertilize, they form a zygote.
3. Meteorologists refer to the water vapor in the atmosphere as
+
O A. humidity
O B. precipitation
O C. condensation
OD. air pressure
Calculate the maximum mass of aluminium which can be extracted from 10 kg of
aluminium oxide
2AlO3+ 3C ----->4Al + 3CO2
Answer:
Hrishikesh. bshjsjbd. jwjjja
the boiling point of isopropyl alcohol is 82.5°C. a student conducts an experiment and finds a boiling point of 83.1°C. what is the students percent error in this experiment?
A.0.6%
B. 0.7%
C. 1.0%
D. 99.3%
Answer:
B. 0.7%
Explanation:
Given data:
Actual boiling point = 82.5°C
Experimental boiling point = 83.1°C
Percent error = ?
Solution:
Formula:
Percent error = ( actual value - experimental value / actual value )×100
by putting values,
Percent error = (82.5°C - 83.1 °C /82.5°C) × 100
Percent error = 0.007 × 100
Percent error = 0.7 %
Negative sign shows that experimental value is greater than accepted value. It can not written in result.
How to fronts and air masses affect weather?
Answer:
Warm fronts often bring stormy weather as the warm air mass at the surface rises above the cool air mass, making clouds and storms. Warm fronts move more slowly than cold fronts because it is more difficult for the warm air to push the cold, dense air across the Earth's surface.
Explanation:
Good luck!
Please help and I will give brainliest!
I am going to put them in order
R r
R RR rR
r rR rr
For a solar eclipse to occur, a. the sun must be directly between Earth and the moon. b. the moon must be directly between Earth and the sun. c. the moon must be directly behind Earth. d. Earth must be directly between the sun and the moon.
For a solar eclipse to occur, the moon must be directly between Earth and the sun.
What is solar eclipse?A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth.
A solar eclipse takes place only at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth's surface.
Hence, option B is the correct answer.
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Water vapor becomes part of the air through the process of evaporation. Describe why and how evaporation occurs.
Explain:
Answer:
evaporation occurs when heat from the sun beams down onto a water source and it turns the water into vapor. If you further explain it, the water vapor will then clump together into clouds. The clouds will then become heavy and release water back to the ground.
Explanation:
The volume of a gas is 450 mL when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the pressure when its volume is changed to 2.00 L?
Use P Subscript 1 Baseline V Subscript 1 = P Subscript 2 Baseline V Subscript 2.
0.225 atm
0.444 atm
2.25 atm
4.44 atm
Answer:
0.225 atm
Explanation:
v1=450ml÷1000=0.45l(1l=1000ml)
P1=1
v2=2.00l
p2=?
p1v1=p2v2
p2=p1v1/v2
=1×0.45/2
=0.225
so the answer is first one
This question is based on Boyle's law as temperature is constant. Boyle's law is derived from ideal gas equation only at constant temperature. Thus the pressure calculated is 0.225atm.
What is Boyle's law?
Boyle's law is a law which states that at constant temperature, the pressure that is exerted by an ideal gas on the walls of the container is inversely proportional to the volume occupied that gas.
Ideal gas is a gas where there is no forces of attraction or forces of repulsion between the particles . The volume of container is equal to the volume occupied by the gas.
Mathematically,
Initial condition to final condition
[tex]P_{1}V_{1} \rightarrow P_{2}V_{2}[/tex]
[tex]P_{1}[/tex]=1.00atm
[tex]V_{1}[/tex]=450 mL=0.45l
[tex]P_{2}[/tex]=?
[tex]V_{2}[/tex]=2.00L
Substituting all values in given equation
[tex]P_{1}V_{1} \rightarrow P_{2}V_{2}\\P_{2}=P_{1}V_{1}\div V_{2}[/tex]
[tex]P_{2}[/tex]=(1×0.45)÷2.00
[tex]P_{2}[/tex]=0.225atm
Thus the pressure when volume changed to 2.00 is 0.225atm.
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What is the best definition of solar radiation?Storing Storing of of energy energy in in Earth'Earth's s oceansoceansEnergy Energy from from the the Sun Sun that that reaches reaches EarthEarthMoisture Moisture and and heat heat energy energy in in the the atmosphereatmosphereIncreased Increased evaporation evaporation due due to to warm warm waterwater
Answer:The solar energy that we receive through solar radiation is directly or indirectly responsible for aspects as important to life as: Photosynthesis in plants; maintaining a planet temperature compatible with life. of the wind. The solar energy that reaches the earth's surface is 10,000 times greater than the energy currently consumed by all
Explanation:
pls answer this asap
Answer:
1. The enthalpy change for the backward reaction is –20 KJmol¯¹
2. The forward reaction is endothermic.
3. The activation energy for the forward reaction is +70 KJmol¯¹.
Explanation:
Considering the diagram given above, the following data were obtained:
1. The enthalpy change for the forward reaction being is +20 KJmol¯¹ and so, the enthalpy change for the backward reaction is –20 KJmol¯¹
2. The heat energy of the product is higher than that of the reactant. Therefore, the forward reaction is endothermic.
3. Activation energy is the minimum energy needed to be overcome in order for the reaction to proceed to product. It can be obtained from the energy profile diagram by considering the energy between the reactants and the peak.
For the question given above, Activation energy = 20 + 50
Activation energy = +70 KJmol¯¹
What is molarity a measurerhent of?
A. The grams of a substance dissolved in a liquid
B. The concentration of a substance dissolved in a liquid
C. The number of moles of a dissolved substance
O O
D. The volume of liquid containing a dissolved substance
ammonium nitrate, which is prepared from nitric acid, is used as a nitrogen fertilizer. determine the percent composition of ammonium nitrate
Answer:
Ammonium nitrate, (NH4NO3), a salt of ammonia and nitric acid, used widely in fertilizers and explosives. The commercial grade contains about 33.5 percent nitrogen, all of which is in forms utilizable by plants; it is the most common nitrogenous component of artificial fertilizers.
how many moles of Al2O3 will be produced if 1.35 moles of Fe are produced?
Answer:
0.675 mol
Explanation:
Step 1: Write the balanced equation
2 Al + Fe₂O₃ ⇒ 2 Fe + Al₂O₃
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of Fe to Al₂O₃ is 2:1.
Step 3: Calculate the moles of Al₂O₃ produced when 1.35 moles of Fe are produced
We will use the established molar ratio.
1.35 mol Fe × 1 mol Al₂O₃/2 mol Fe = 0.675 mol Al₂O₃
What is the empirical formula for propane?
Answer:
The empirical formula for propane is C3H8.
Answer:
Because propane is made up of only hydrogen and carbon _ the chemical formula is C3H8..
what mechanical weathering process is used when water turns to ice?
Answer:
Frost weathering
Explanation:
Answer:
frost wedging where the water seeps into the cracks of a rock and expands on freezing and making the crack bigger
Explanation:
A 100 mL sample of a gas has a pressure of 1.92 atm. What would the volume of the gas be at a pressure of 2 atm, if temperature remains constant?
Answer:
New volume V2 = 96 ml
Explanation:
Given:
Old volume V1 = 100 ml
Old pressure P1 = 1.92 atm
New pressure P2 = 2 atm
Find:
New volume V2
Computation:
Using Boyle's Law
P1V1 = P2V2
(1.92)(100) = (2)(V2)
V2 = 96
New volume V2 = 96 ml
2) How many moles of Al atoms are needed to combine with 1.58 mol of O atoms to make
aluminum oxide, Al,0,?
Answer:
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Explanation:
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What elements make up our blood???
Answer:
erythrocytes, leukocytes, platelets
Plz help me with is thank you
Answer:
d
Explanation:
the pattern of the chart
Explain cell division in multicellular organisms?
Answer:
the divide through osmosis of mitosis or sum
Explanation:
Answer:
In multicellular organisms, cell division aids in the formation of gametes, which are cells that combine with others to form sexually produced offspring. For growth to occur in living organisms, the number of cells have to increase through cell division until it reaches its maximum size. The human body also repairs injuries by means of cell division.
I hope this answer helps you find your answer! Have a great day! :)
How many moles does 100 g of Calcium hydroxide contain?
Answer:
The molecular formula for Calcium Hydroxide is Ca (OH)2. The SI base unit for amount of substance is the mole. 1 grams Calcium Hydroxide is equal to 0.01349660992152 mole. Note that rounding errors may occur, so always check the results.
Explanation:
sorry if it's wrong
How many moles of calcium atoms are in each mole of calcium carbonate?
Answer:
1 mole of calcium, one mole of carbon, and 3 moles of oxygen.
Explanation:
Answer:
You know that one mole of calcium carbonate contains 1 mole of calcium, one mole of carbon, and 3 moles of oxygen. Each mole contains 6.022⋅1023 atoms - this is known as Avogadro's number.
WILL MARK BRAINLIST!!! only for correct answer
NEED CORRECT ANSWER ASAPPP
Answer:
D. 4
Explanation:
Reflection can be defined as a phenomenon which typically involves a change in the direction of a ray of light or waves as it falls on a smooth surface.
Simply stated, reflection occurs when a ray of light or wavefronts bounces off a smooth surface.
Hence, from the diagram provided above, the thin beam of light which illustrates reflection is the fourth because as it hit the surface, it bounced back to the medium from which it was originally propagated with.
Why is water considered to be neutral?
A. It has only (H+) in solution.
B. Its (H+) and (OH) are the same.
C. It has only (OH) in solution
D. Its pH + POH =14
b
.................,
......
Answer:
Its [H+] and [OH-] are the same.
Explanation:
i just took the test and got it right
