Democrats and Republicans
What is kinetic energy (KE)
A. energy an object has because of its position
B. energy an object has because of its height
C. energy an object has because of its direction
D. energy an object has because it is moving
Answer:
The answer is D, I hope this helps
Answer:
It would be D.energy an object has because it is moving-hope this helps
6) Find the pH of the following solutions:
a) 0.00010 M HClO4
b) 2.35 x 10-3 M HI
c) 4.678 x 10-5 M HNO3
d) 0.0000877 M HCl
e) 0.00020 M HF
f) 0.0000061 M H3O+
g) 4.3 x 10-3 M NaOH (This is a base! Remember you will be finding pOH first!)
h) 6.7 x 10-9 M KOH (This is a base! Remember you will be finding pOH first!)
i) 0.00044 M HCl
j) C
Answer:
pH is the negative logarithm of hydrogen (oxonium) ion concentration of aqueous solutions.
Explanation:
Recall that pH is defined as the negative logarithm of hydrogen ion concentration. We are going to apply that definition here.
a) 0.00010 M HClO4
pH= -log[0.00010]
pH= 4
b) 2.35 x 10-3 M HI
pH= -log[2.35 x 10-3 ]
pH= 2.63
c) 4.678 x 10-5 M HNO3
pH= -log[4.678 x 10-5]
pH= 4.3
d) 0.0000877 M HCl
pH=-log[0.0000877]
pH= 4.1
e) 0.00020 M HF
pH= -log[0.00020]
pH= 3.7
f) 0.0000061 M H3O+
pH= -log[0.0000061]
pH= 5.2
g) 4.3 x 10-3 M NaOH
pOH= -log[OH^-]
pOH= -log[ 4.3 x 10-3 ]
pOH= 2.4
But
pH + pOH =14
Therefore
pH= 14-pOH
pH= 14 -2.4
pH= 11.6
h) 6.7×10^-9 M KOH
pOH= -log[OH^-]
pOH= -log[ 6.7 x 10-9 ]
pOH= 8.2
But
pH + pOH =14
Therefore
pH= 14-pOH
pH= 14 -8.2
pH=5.8
I) 0.00044M HCl
pH= -log[0.00044]
pH= 3.4
Answer: A. 4 B. 2.6 C. 4.3 D. 4.1 E. 3.7 F. 5.8 G. 11.6 H. 5.8 I. 3.4
Explanation:
A. 0.00010 M HClO4
pH = -log [1.0 x 10^-4]
= 4 - log 1 = 4
B. 2.5 x 10^-3 M HI
pH = -log [2.5 x 10^-3]
= 3 - log 2.5
= 3 - 0.398 = 2.6
C. 4.678 x 10^M HNO3
pH = -log [4.678 x 10^-5]
= 5 - 0.7 = 4 .3
D. 0.0000877M HCL
pH = - log [8.77 x 10^-5]
= 5 -0.943 = 4.057 =4.1
E. 0.00020M HF
pH = -log [2.0 x10^-4]
= 4 - 0.301 = 3.7
F. 0.0000061M H3O+
pH = - log [ 6.1 x 10^-6]
= 6 -0.785 = 5.2
G. 4.3 x 10^-3 M NaOH
Finding pOH first , we have
pOH = - log [4.3 x 10-3]
= 3 - 0.633 = 2.4
pH + pOH = 14
pH = 14 - 2.4 = 11.6
H. 6.7 x 10^-9 M KOH
Finding pOH, we have,
pOH = - log [6.7 x 10^-9]
= 9 - 0.826 = 8.17 = 8.2
pH + pOH = 14
pH = 14 - 8.2 = 5.8
I. 0.00044 M HCl
pH = -log [ 4.4 x 10^-4]
= 4 - 0.64 = 3.36 = 3.4
Suppose that a solution is tested for NO2 ion by adding 3M H2SO4 and heating, repeating this process until no further reaction occurs. This solution
is then analyzed for NO3 ion by adding FeSO4 solution and more H2SO4, heating the test tube and its contents. The NO3 ion reaction is positive. In this case, is it accurate to state that NO3 ion was present in the original solution? Briefly explain. Write appropriate equations to support your answer.
Answer:
The correct equation will be "[Fe(H2O)5]²⁺ + NO → Fe(H2O)5NO]²+ (brown ring) ".
Explanation:
For NO₂, the addition of H₂SO₄ forms HNO₂ comprising NO gas as well as HNO₂, the equation will be:
⇒ NO₂⁻ + 2H⁺ → HNO2
⇒ HNO₂ + H₂O + H⁺ → HNO₃ + NO
For NO₃⁻,
NO₃⁻, Fe₂+ oxidized to Fe₃ + then releases NO gas in the existence of H₂SO₄
⇒ 3Fe₂⁺ + 4H⁺ + NO₃⁻ → 3Fe₃⁺ + NO + 2H₂O
Brown ring forming establishes NO3- presence in the initial test sample,
⇒ [Fe(H2O)5]²⁺ + NO → Fe(H2O)5NO]²+ (brown ring)
Many functions of the nervous system require you to think about them to make them happen and are called ____ ?
The role of chlorophyll during photosynthesis is to
-release carbon dioxide
-reflect light energy
-make ATP
-absorb light energy
Answer:
Absorb light energy
Explanation:
Chlorophyll absorbs light energy which is used to produce carbohydrate and oxygen in the presence of carbon dioxide and water.
Which function do pygmy rabbits serve in a desert?
OA) eat sagebrush
B) make their own food
C) perform photosynthesis
D) convert light energy to chemical energy
Answer:
A
Explanation:
A: Eat sagebrush
A rabbit is an animal. It cannot make it's own food. It is a heterotroph, and it needs to feed on other organisms to survive. A pygmy rabbit would eat sagebrush, therefore this is the correct answer.
B: Make their own food
Rabbits and animals can't make their own food, they have to eat other things to survive. Therefore, this answer is incorrect.
C: Perform photosynthesis
Rabbits and animals can't perform photosynthesis, only plants, algae, and certain bacteria can. This answer is also wrong.
D: Convert light energy to chemical energy
In the process of photosynthesis, light energy from the sun is turned into chemical energy. Animals like rabbits can't perform photosynthesis, so this choice is also incorrect.
The best choice is A: eat sagebrush.
Help! Drag and drop the answer into the box to match each method of how to separate solutions to its description.
Answer:
1) D 2) A 3) C
Explanation:
how many moles in 2.5 liters of methane gas
Answer:
0.155836449023405
Explanation:
The molecular formula for Methane is CH4.
The SI base unit for amount of substance is the mole.
1 grams Methane is equal to 0.062334579609362 mole.
Answer:
Explanation:
After calculating the answer will be 0.112 mol CH4
Which freshwater ecosystem is least productive?
O A. Stream
B. Bog
C. Marsh
D. Swamp
SUBMIT
What is the role of a scientist
Answer:
This is what they usually do.
Explanation:
Scientists are often people who want to see change occur. ... Today, the role of a scientist is the same. We have the obligation to explore and discover. Scientists use their resources to bring about change, whether it is change in medicine, improvements in the environment, or creating more efficient fuels
Scientist Responsibilities. The role of a scientist is integral and vital for the better functioning of society. Scientists are responsible for conducting detailed research on various subjects. They are liable for influencing modern society with their new developments and innovations, bringing about a great change in the quality of life.
What is the molar mass of magnesium (Mg)? A 12.00 g/mol B 22.99 g/mol C 24.31 g/mol D 26.98 g/mol
Answer:
C 24.31g/mol
Explanation:
if you look at the periodic table, than when you look at the element magnesium (Mg) it is 24.305 in atomic mass which rounds up to 24.31
Which best describes a force?
a vector with magnitude and direction
a vector with speed and strength
a vector with direction only
a vector with strength only
Mark this and retum
Save and Exit
Next
Submit
Answer:
a vector with speed and strenght
Explanation:
Answer:
Explanation:
A
Why would the Linnaeus system not stay the same? Explain in your own words.
Answer:
The Linnaeus system of classification will always stay the same. o Fact: Linnaeus system will always stay the same exact way.so therefore it will stay the sam infact it will keep going.
Explanation:
Evidence shows that traits going from species,genus,family,order,class,phymisnes,and then kingdom.
How many grams of
CO2 will be produced
by burning 6 grams of carbon?
Please I really need your help
Answer:
Explanation:
22g of CO2
Earth would fly off into space in a straight line if the ______________________________
between Earth and the Sun ended.
Answer:
Gravity
Earth would fly off into space in a straight line if the gravity
between Earth and the Sun ended
Explanation:
The Earth's orbit is made through gravity and inertia. If gravity between the Sun and Earth had ended, inertia would make the Earth travel in a straight line because there is no gravity to pull it towards the sun and keep it in motion.
The taxonomic classification system contains three Domains . List all 3 Domains: (Hint: last 3 slides of the PDF Power Point will all give the answer
Answer:
Archaea, Bacteria, and Eukarya.
Explanation:
hope this helped
Which of the following is most likely an indication of a chemical change?
A. A loud sound when an MP3 player is turned on
B. A loud sound when someone claps their hands
C. A loud sound when a starter's pistol is fired at a race
D. A loud sound when a large object falls to the ground
Hello there!
Question: Which of the following is most likely an indication of a chemical change?
Answer Choices:
A. A loud sound when an MP3 player is turned on.
B. A loud sound when someone claps their hands.
C. A loud sound when a starter's pistol is fired at a race.
D. A loud sound when a large object falls to the ground.
Correct Answer:
C. A loud sound when a starter's pistol is fired at a race.
Reasons:
A would not be correct since an MP3 player is a mechanical object and does not mix any substances that create a reaction.
B would not be correct since clapping hands causes a loud sound due to two forces slamming together and causes a disturbance in the air.
D would not be correct since a large object falling to the ground does not indicate any chemical reactions or changes since its merely the result of a mass hitting another mass.
C would be correct since the gunpowder mixes with other substances inside the pistol's chamber and causes and explosion, and explosions are part of a chemical reaction indicators.
What is the total mass of solute in 1000 g of a solution having a concentration of 5 ppm
It's 500 pounds worth of rpm and solute when put together to form a compound of space and time to warp quantum matter to the point of no existence for big bang reopening of time and super warp of neutral electronic atoms with a power of 4 to 5 in ratio of micrometers squared to the power of 10
When 10 moles of O₂ reacts with 1.4 moles of C₁₀H₈ what is the limiting reactant? *
Answer:
O2 is the limiting reactant.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2C10H18 + 29O2 —> 20CO2 + 18H2O
The limiting reactant can be obtained as follow:
From the balanced equation above,
2 moles of C10H18 reacted with 29 moles of O2.
Therefore, 1.4 mole of C10H18 will react with = (1.4 x 29)/2 = 20.3 moles of O2.
From the above calculation, we can see that it will take a higher amount of O2 i.e 20.3 moles than what was given i.e 10 moles to react completely with 1.4 mole of C10H18. Therefore, O2 is the limiting reactant and C10H18 is the excess reactant.
please help idk what to do
Answer:
2H and 6N
EXplain
You need one H and three N molecules for one molecule of NH3 for you’ll need 2 H and 6N Molecules to create 2
Answer:2h and 6n
Explanation:
Hope i could help
A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. Which is symbol of this radionuclide?
Superscript 32 subscript 17 upper P
Superscript 17 subscript 15 upper P.
Superscript 30 subscript 15 upper P.
Superscript 32 subscript 15 upper P.
Answer:
D. superscript 32 subscript 15 upper P
Explanation:
took the test
An atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. Superscript 32 subscripts 15 upper P is a symbol of this radionuclide. Therefore, option D is correct.
What is a radionuclide?A radionuclide is a type of nuclide that is unstable and undergoes radioactive decay. This means that the nucleus of the radionuclide is not stable and will spontaneously emit energy in the form of particles or electromagnetic radiation to become more stable.
The symbol of an element is determined by the number of protons in the nucleus, which is also known as the atomic number. In this case, the radionuclide has 15 protons, so it is an atom of phosphorus, which has an atomic number of 15.
The total number of nucleons in the nucleus (protons + neutrons) is 15 + 17 = 32. Therefore, the correct symbol for this radionuclide is Superscript 32 subscript 15 upper P, which represents an isotope of phosphorus with a mass number of 32.
Thus, option D is correct.
To learn more about the radionuclide, follow the link:
https://brainly.com/question/14605156
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It is best to say that electric motors require _______ to work. a. a continuous current b. a galvonometer c. a generator d. energy
Answer:
The answer is a) continous current
What is the percent of iron (Fe) in 325g of FeCl3
Answer:
Element Symbol Mass Percent
Chlorine Cl 65.571%
Iron Fe 34.429%
Explanation:
Someone please help me rephrase this or make it shorter :
When light shines on an object it is reflected, absorbed or transmitted through the objects material and the frequency (color) of the light.
Answer:
When light shines on an object it is either reflected, absorbed, or transmitted through the object to produce a frequency (color).
Explanation:
When light shines on an object it is either it is reflected, absorbed or transmitted through the objects material and produce light of some frequency or color.
What is reflection?Reflection is the process in which an incident light ray on a transparent material returns back in the straight direction which make the material gleaming.
Absorption is the process of absorbing a fraction of the incident light. It depends on the nature of the material. Transmission is the process of penetrating of light through a material and returns backs through the other end.
All these three process does no occur together for a material. Either one will be taken place when light is hit on the material and it reflects or transmits it produce a light of certain frequency.
To find more on light reflection, refer here:
https://brainly.com/question/2254222
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Which of these makes a source more reliable?
A. if you have cited it correctly
B. if you found the information online
C. if the information is from expert scientists
D. if you are skeptical when you hear new information
What is the molariity of a 50.0 mL aqueous solution containing 10.0 grams of acetic acid, CH3COOH
Answer:
Molarity is 1.25
0.00056 kg = in metric conversion
Answer:
0.56
Explanation:
Answer:
0.56
Explanation:
in the metric stair case there is 3 space between g and kg, since you are going down you move the decimal 3x to the right.
PLEASE HELP ME
Which statement is true about HCl? (15 points)
Select one:
a. It is a salt because it increases the concentration of metallic ions.
B. It is a salt because it is formed by the reaction of an acid and a base.
C. It is an acid because it increases the concentration of hydroxyl ions. D. It is an acid because it increases the concentration of hydrogen ions.
Answer:
A i think idk sry
Explanation:
Answer: D
Explanation: It is an acid because it increases the concentration of hydrogen ions
5 Points
How have scientists been able to determine the composition of Earth's
layers?
A. By studying the magnetic fields of various planets and moons
B. By looking at how seismic waves change speeds as they travel
through Earth
C. By looking at how X-rays affect the planet
D. By studying layers of other planets and moons
CUIDAIT
Answer:
B
Explanation:
By looking at how seismic waves change speeds as they travel
through Earth
Answer:
b.
Explanation:
What volume of 1.25 M lithium hydroxide LiOH is needed to neutralize 445 ml of 0.550 M phosphoric acid (H₃PO₄ )?
Answer:
0.587 litres (3 s.f.)
Explanation:
Please see attached picture for full solution.