Answer:
THE VOLUME OF 0.200M CALCIUM HYDROXIDE NEEDED TO NEUTRALIZE 35 mL of 0.050 M NITRIC ACID IS 43.75 mL.
Explanation:
Using
Ca VA / Cb Vb = Na / Nb
Ca = 0.0500 M
Va = 35 mL
Cb = 0.0200 M
Vb = unknown
Na = 2
Nb = 1
Equation for the reaction:
Ca(OH)2 + 2HNO3 --------> Ca(NO3)2 + 2H2O
So therefore, we make Vb the subject of the equation and solve for it
Vb = Ca Va Nb / Cb Na
Vb = 0.0500 * 35 * 1 / 0.0200 * 2
Vb = 1.75 / 0.04
Vb = 43.75 mL
The volume of 0.02M calcium hydroxide required to neutralize 35 mL of 0.05 M nitric acid is 43.75 mL
The volume of 0.0200 M calcium hydroxide that would be required to neutralize 35.00 mL of 0.0500 M nitric acid will be 43.75 mL
From the equation of the reaction:
[tex]Ca(OH)_2 + 2 HNO_3 ---> Ca(NO_3)_2 + 2 H_2O[/tex]
The mole ratio of calcium hydroxide to nitric acid is 1:2.
Mole of nitric acid = molarity x volume
= 0.0500 x 35.00/1000
= 0.00175
Thus, the mole of the calcium hydroxide can be calculated as:
0.00175/2 = 0.000875
Volume of calcium hydroxide = mole/molarity
= 0.000875/0.0200
= 0.04375 L
= 43.75 mL
More on volume calculation can be found here: https://brainly.com/question/22819768
A straight piece of wire is coiled to form a spring. Is it a Chemical or ra physical change? explain by justifying your answer.
Answer:
Explanation:
It is a physical change. The reason is that when a straight piece of wire is coiled to form a spring, its chemical properties do not change. Only the physical property ( shape ) of the wire changes.
Hope this helps
plz mark as brainliest!!!!!!
Answer:
See below
Explanation:
If a piece of wire is coiled to form a spring, it is a physical change. This is because there is no change in it's bonds rather there is a change in its shape and figure. Also, Physical change is reversible such that the coiled piece of wire can be changed back to a straight piece of wire. But, A chemical change is irreversible.
So, This is a physical change.
please help, ive been putting 3 for the coefficient and 14 for the exponent but, it keeps saying it’s wrong. any help is appreciated.
Answer:
3 × 10¯¹⁰
Explanation:
9×10² ÷ 3×10¹²
The above expression can be evaluated as follow:
9×10² ÷ 3×10¹²
Recall:
3² = 9
3¹ = 3
Therefore,
9×10² ÷ 3×10¹² = 3²×10² ÷ 3¹×10¹²
Recall:
y^m ÷ y^n = y^(m – n)
Therefore,
3²×10² ÷ 3×10¹² = 3²¯¹ × 10²¯¹²
= 3¹ × 10¯¹⁰
Recall:
y¹ = y
Therefore,
3¹ × 10¯¹⁰ = 3 × 10¯¹⁰
Therefore,
9×10² ÷ 3×10¹² = 3 × 10¯¹⁰
What is a good example of ACCURACY and PRECISION? *
Answer:
Bow and arrow
Explanation:
A bow and arrow need accuracy to hit a target. It needs precision to hit the small target
Lamar has been running sprints tp prepare for his next football game. He has found that he can maintain his maximum speed for 45 yards. He's thinking of running in a 5 km race in a few months, but doesn't know if he can maintain his maximum speed for the entire 5 km. Can you help him determine how far he can?
Answer and Explanation:
Given that
Length of race = 5km
Maximum speed = 45 yards
Based on the above information,
We transform the yards to kilometer i.e.
1 km = 1093.613 yards
And,
x = 45 yards
So,
1093.613 × x = 45
x = 45 ÷ 1093.613
x = 0.0411480 km
Where
x = Maximum length for which the maximum speed demonstrated in kilometers is sustained.
So, we concluded that Lamor cannot go for the overall 5km as he maintained till 0.0411 km
Imagine that Ana has a block made of pure gold. If she cuts this block into two equal pieces, pick the statement that best describes the resulting pieces.
Answer : The correct statement is:
The density of each piece is the same as that of the original block.
Explanation :
Intensive property : It is defined as a property of substance which does not change as the amount of substance changes.
Examples: Temperature, refractive index, density, hardness, etc.
According to question, if Ana has a block made of pure gold and she cuts this block into two equal pieces then the density of each piece is the same as that of the original block because density is an intensive property that does not changes until and unless material is changed.
That means density remains same as that of the original piece.
Hence, the correct statement is the density of each piece is the same as that of the original block.
The growth rate is the death rate minus the birth rate these change because birth rates and
death rates increase or decrease
O True
False
Question 3
1 pts
Answer:
Hey there!
False. The growth rate is actually the birth rate minus the death rates.
Let me know if this helps :)
The first mechanistic step in the direct reaction of an amine with a carboxylic acid to produce an amide is ________.
A) an acid-base reaction
B) nucleophilic attack on the carbonyl carbon
C) loss of H2O
D) loss of CO2
E) loss of N2
Answer:
The first step is - option A) an acid base reaction.
Explanation:
The direct reaction of a carboxylic acid with an amine to form an amide is expected to be difficult as it would deprotonate the carboxylic acid and make a nonreactive carboxylate.
The first step in this reaction would be an acid - base reaction as protonation of the carbonyl carbon, that involves the interchange of proton in between electric charge or neutral compound, it is also known as protonation or deprotonation. The acid base reaction is followed by the nucleophilic attack on the carbonyl carbon.
Thus, The first step is - option A) an acid base reaction.
is oxygen gas an element or a compound?
Select the claim that correctly describes the surface tension of water and the ability of the water strider to walk on water if the pond temperature increases due to global warming.
A
Global warming would increase the surface tension of water, making it easier for water striders to walk on water.
B
Global warming would increase the surface tension of water, making it harder for water striders to walk on water.
C
Global warming would decrease the surface tension of water, making it easier for water striders to walk on water.
D
Global warming would decrease the surface tension of water, making it harder for water striders to walk on water.
Answer:
The correct option is;
D Global warming would decrease the surface tension of water, making it harder for water striders to walk on water
Explanation:
Global warming involves the heating of the ecosystems on Earth due to human activity, which results in rising temperatures
As the temperature of the water rises due to global warming the surface tension decreases due to the increasing ratio of the force of higher kinetic energy water molecule to inter-molecular cohesive forces pulling the water together, which tends to weaken the effect of the cohesive forces and thus reduce the surface tension
As the surface tension has been reduced, the water striders will find it difficult to walk on the water surface as the maximum weight the water surface can lift without shearing, due to surface tension is reduced.
Thanks for the help :) Question attached below:
• Take a look at the steps below to see how to balance this equation. Let's start by writing the unbalanced equation given the information.
Unbalanced Equation : C₃H₈ (g) + O₂ (g) → CO₂ (g) + H₂O (g) ,
Start by Balancing the Carbons : C₃H₈ (g) + O₂ (g) → 3CO₂ (g) + H₂O (g)
Now let's balance the Hydrogen : C₃H₈ (g) + O₂ (g) → 3CO₂ (g) + 4H₂O (g)
Balancing the Oxygen : C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)
Balanced Equation : C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)
• Let's apply dimensional analysis here,
0.7 L propane × (5 liters Oxygen / 1 liter Propane) = 3.5 Liters of Oxygen
• Similarly we can identify the liters of carbon dioxide produced in the reaction,
0.7 L propane × (3 liters Carbon Dioxide / 1 liter Propane) = 2.1 Liters of Carbon Dioxide
• 0.7 L propane × (4 liter water vapor / 1 liter propane ) = 2.8 Liters of Water Vapor
What is needed to burn the candle (reactant)?
Answer:
wax, candlewick, and oxygen
Explanation:
The burning of the candle is both a physical as well as a chemical change. The reactants are the substances or the raw materials that are required for a reaction to the process. In the process of burning a candle, the reactants are the fuel which includes wax and wick, and oxygen which is found in the air. The products found at the end of the reaction are carbon dioxide and water vapor.
Silver has a density of 10.5 g/cm and gold has a density of 19.3 g/cm. Which would
have a greater mass, 5 cm of silver or 5 cm of gold?
Answer:
Hey there!
Gold would have a greater mass, because density is mass/volume, and if the density is greater, so is the mass.
Let me know if this helps :)
Carbon burns in air to release energy along with formation of which carbon dioxide carbon dioxide and water carbon dioxide and hydrogen carbon monoxide and water
Answer:
CO2 and O2
Explanation:
How much energy is transferred when 30.0
g of water is cooled from 25.0 °C to 12.7 °C.
Answer:
Heat transferred, Q = 1542.42 J
Explanation:
Given that,
Mass of water, m = 30 grams
Initial temperature, [tex]T_i=25^{\circ} C[/tex]
Final temperature, [tex]T_f=12.7^{\circ} C[/tex]
We need to find the energy transferred. The energy transferred is given by :
[tex]Q=mc\Delta T[/tex]
c is specific heat of water, c = 4.18 J/g °C
So,
[tex]Q=30\ g\times 4.18\ J/g-^{\circ} C\times (12.7-25)\ ^{\circ} C\\\\Q=-1542.42\ J[/tex]
So, 1542.42 J of energy is transferred.
Please I have no idea my teacher didn’t teach this
Answer:
B (40º c)
Explanation:
Rubidium being silvery-white and melting at 39 ºC. Which means 40º C is the closest.
Bleach boils at 101°C. Isopropyl alcohol (rubbing alcohol) boils at 82.5°C. Vinegar boils at 100.6°C. Water boils at 100°C. A student has an unknown clear liquid. She wants to determine what it is, so she decides to boil the liquid and use the boiling point as a means of identification. The liquid starts boiling at 99°C. Based on the boiling points shown, which substance is it?
Answer:
most likely water
Explanation:
most likely it is water, however pressure plays a role, if you are at sea level the boiling point of water is 100°C but if you are on Mt. Everest it is 71°C, assuming she is slightly above sea level it is water.
Which of the following does not take place in the "Experiment step of the scientific method?
A. Making a bar graph
B. Creating the procedures
Collaborative Lesson Planning
C. Making a materials list
D. Conducting the experiment
A chef fills a 100 ml container with 76.5 g of cooking oil. What is the density of the oil? \
A top fuel dragster is designed to go from 0 to 100 miles per hour in a mere 0.8
seconds. Calculate its acceleration. Show your work and include units.
Answer:
Acceleration, [tex]a=55.88\ m/s^2[/tex]
Explanation:
It is given that, A top fuel dragster is designed to go from 0 to 100 miles per hour in a mere 0.8.
Initial velocity, u = 0
Final velocity, v = 100 mph
1 mph = 0.44704 m/s
100 mph = 44.704 m/s
Time, t = 0.8 s
We need to find its acceleration. Rate of change of velocity equals acceleration.
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{44.704-0}{0.8}\\\\a=55.88\ m/s^2[/tex]
So, the acceleration is [tex]55.88\ m/s^2[/tex]
4. Refer the table given below to answer the questions fon Electronic configuration Element Atomic number 11 R 19 2,8,1 2,8,8, 1 2,8,8, 92 20 S T 12 2,812. Are the above elements Q, R, S and I metals or non-metals? Support your answer with reasona.
Answer:
The electronic configuration of the element with Atomic number 19 is 2,8,8,1. The element is potassium. It is an alkali metal with one valence electron.
?Where did the mass of the forest trees come from? What happens to that mass when the forest burns?
Answer:
Forests prevent desertification.
Explanation:
If an atom has 6 protons and 7 neutrons it will have 7 electrons if it is a neutral atom.
Answer:
NO
Explanation:
To maintain electric neutrality, the atom has to have equal number of electrons and protons. Therefore, it needs to have 6 electrons to be neutral.
Whenever you cant study when you have to , listen to this song
'Very very strongest one piece'
Why is it important to identify carefully the problem to be solved
Answer:
It's importance is the fact that you cannot solve s situation if you don't know it's problem.
Explanation:
Problem identification or identifying a problem by scientist I a major and a key step in solving a problem.
I mean, if you don't identify a problem, there is no way you can think about the solution not to talk of getting the solution.
So identification of a problem is infact one of the major step a scientist must take to solve a situation.
It's importance is the fact that you cannot solve s situation if you don't know it's problem.
Which best describes the role of a primary consumer in a food web? Carnivore that feeds on producers Herbivore that feeds on producers Herbivore that feeds on primary consumers Carnivore that feeds on primary consumers
A food web is the interconnection of the various food chains. A herbivore is a primary consumer that feeds on the producers in a food web. Thus, option B is correct.
What is a primary consumer?A primary consumer is an organism that appears second at the trophic level after the producers in an ecological pyramid of the food web and food chain. They feed on the producers to gain energy.
The primary consumer is herbivores as they mainly eat the producers that are planted in a food web. They get the maximum amount of energy as a consumer in a pyramid.
They only eat plants hence called herbivores. They get eaten by the secondary consumers that are omnivores and carnivores as they eat plants and animals both.
Therefore, option B. primary consumer are herbivore that eats producers.
Learn more about primary consumers here:
https://brainly.com/question/11173626
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What is 745000 millimeters converted to Megameters?
Answer:
0.000745 megameters is the answer please mark me as brainliest
Answer:
Instantly Convert Millimeters (mm) to Megameters (Mm) and Many More Length Conversions Online. Millimeters Conversion Charts. Many Other ...
Missing: 745000× | Must include: 745000
How is heat measured?
Answer:
To measure heat, you divide the change in temperature of a sample of water by the mass of the water.
Write a full chemical equation for the reactions between magnesium and sulfuric acid
Answer:
magnesium + hydrochloric acid → hydrogen gas + magnesium chloride
explanation:
the nitrogen in HNO3 is in the +5 oxidation state and is easily reduced. The reduction would result in the oxidation of the hydrogen gas, forming the water once again.The sulfur in H2SO4 is also in its highest oxidation state, +6.
Hope this helps :)
The long-term and short-term carbon cycles are connected by the fact that some of the carbon contained in C6H12O6 (or other organic molecules) in plants is incorporated into sedimentary rocks or oil; carbon in sedimentary rock and oil is not immediately cycled back to the atmosphere.
a. True
b. False
Answer:
False
Explanation:
The carbon cycle is a process which involves the flow of carbon through all of living things and life forms on Earth. The carbon cycle span over two segments: long-term and short-term, allowing for regulation of atmospheric carbon dioxide.While the short term segment deals with Earth forms that are more 'fleeting' like water nd air, the long-term affects the rock which take centuries to process through completely.In the short-term reservoir, carbon is stored in the atmosphere, oceans and biosphere with the ocean containing the largest amount of carbon. The biggest player and regulator of atmospheric carbon however is the ocean, not the biosphere. It is what links the long-term segment reserves to the short-term because carbon dioxide is removed from the atmosphere and converted to fossil fuels and rocks which are components of the long-term reserves.I hope this explanation was clear and comprehensive.
What properties you can determine for carbon and calcium based on their respective locations on the periodic table
Answer:
Carbon is non metal because it is found in the right side of the periodic table while calcium is metal because it is found in the left side of the periodic table.