Answer:
hunit
Explanation:
5
A professor insists that a research scientist in her laboratory repeat an
experiment, despite the fact that the experiment took several weeks to
complete. Which best explains the professor's reasoning?
Answer:
This is to make sure that the experiment is precise as outside disturbance could cause false outcome
4NH3(g) + 3O2(g) --> 2N2(g) + 6H2O(l)
H = 1530.4 kJ
If the temperature of this system is increased, then the equilibrium will shift to the _______ and the amount of N2 gas will _________.
a. left, increase
b. left, decrease
c. right, decrease
d. right, increase
Answer:
its D
Explanation:
PLEASE HELPPP!!!
The vapor pressure of a substance is 792 kPa at 0.0 degrees Celsius. What
is the vapor pressure of water at this temperature expressed in atmospheres?
a.1.04 atm
b. 3.26 atm
c. 7.82 atm
d. 5.62 atm
Answer:
I'm pretty sure it's A but I am not 100 present
hope this helps ❤️
A solution is observed to have a sour taste, it turns litmus paper a pinkish/red color, and is
corrosive to living tissue. Which relationship between ions shown below is correct for this
solution?
A.)[H'] > [OH']
B.)[H') <[OH']
C.)[H] = [OH)
D.)More information is needed
Answer:
Option (A.) [H+] > [OH-]
Explanation:
From the question given, we understood that the solution is:
1. Has a sour taste.
2. It turns litmus paper into pinkish /red.
3. It corrosive to living tissue.
The above information proofs that the solution is acidic because all the listed characters of the solution are exactly the characteristics of an acid solution.
Since the solution is acidic, it therefore means that the concentration of Hydrogen ion, [H+] is more than the concentration of Hydroxide ion, [OH-] .
Option A gives the correct answer to the question.
Answer:
The correct option is;
A.) [H⁺] > [OH⁻]
Explanation:
The given properties of the solution are;
1, Turns litmus paper pinkish/red
2. Corrosive to living tissue
Since the solution turns the litmus paper red, we recall that blue or neutral litmus paper turns to red when placed in an acid solution, therefore, the solution is an acid
We are also given that the solution is corrosive to living tissue, therefore, the solution is a strong acid
Fromm the above, the number of hydrogen ions, [H⁺] in the solution is much more than the number of hydroxyl ion [OH⁻]
Hence, the correct option is A.) [H⁺] > [OH⁻].
Which type of material becomes molten rock at subduction zones?
Answer:
Heavy plates
Explanation:
Took the test, sorry.
Hello, can someone help me? Please
Which velocity changed the most?
Answer:
A
Explanation:
Since acceleration is the change of velocity and f=ma, the change in velocity is dependent on force and mass. Since the force on all of the objects is the same, the one with the least mass will accelerate the most. Object A is the least massive at a mass of 0.5kg, meaning that its velocity will change the most. Hope this helps!
What is the pH of a solution that has a H+ concentration equal to 1.7 x 10-5 M?
5.20
0.22
10.20
4.77
Considering the definition of pH, the pH is the last option, 4.77.
In firts place, you need to know that pH is a numerical scale used to specify the acidity or alkalinity of a solution. The pH is related to hydrogen ions, since it indicates the amount of these ions present in a solution or substance.
Mathematically, pH is defined as the opposite of the base 10 logarithm or the negative logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions:
pH= -log [H⁺]
The pH scale varies from 0 to 14, being acidic solutions with a pH lower than 7 and basic those with a pH greater than 7, while the pH value 7 corresponds to neutral substances.
In this case, being [H+]=1.7×10⁻⁵ M, you can replace this value in the definition of pH:
pH= -log (1.7×10⁻⁵ M)
Solving:
pH=4.77
Then, the pH is 4.77.
Learn more: brainly.com/question/3992824?referrer=searchResults
periods on the periodic table are
Answer:
Periods on the periodic table of elements
Explanation:
In the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families. (See also The Periodic Table: Metals, Nonmetals, and Metalloids.) In each period (horizontal row), the atomic numbers increase from left to right.
The movement of rocks and soil is an
example of...
O erosion
O weathering
O deposition
Answer:
its weathering
Explanation:
brainliest please
Where is the least amount of energy transferred in a food web?
Group of answer choices
From primary consumer to secondary consumer
From secondary consumer to primary consumer
From secondary consumer to producer
From producer to secondary consumer
Answer:
From primary consumer to secondary consumer; that is the answer!
Answer: "From primary consumer to secondary consumer"
Explanation:
I took the test (good luck)
The movement of material from a more crowded area to a less crowded area is called
A. Diffusion
B. Respiration
C. Osmosis
D. Photosynthesis
The movement of material from a more crowded area to a less crowded area is called diffusion, which achieves equilibrium when the concentration of molecules is equal in both areas.
The movement of material from a more crowded area to a less crowded area is known as diffusion. This natural process involves molecules moving from an area of higher concentration to an area of lower concentration. The process continues until the concentration of molecules is equal in both areas, achieving a state called equilibrium.
Diffusion is also described as the movement of solutes "down the concentration gradient." Osmosis is a specific type of diffusion pertaining to the movement of water across a semi-permeable membrane due to a concentration difference. However, since the question does not specify water or a semi-permeable membrane, the best answer would be option A, which is Diffusion. Respiration and photosynthesis, on the other hand, are biological processes involved in energy conversion and do not describe the movement of materials from a more crowded to a less crowded area.
How many moles of O2 are needed to produce 50.0 moles of CO2?
2 C8H18 + 25 O2 --> 16 CO2 + 18 H20
a) 78.1 moles
Answer:
4 moles
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
Which of these is a physical property?
A malleable
B easy to digest
C does not burn
D become moldy quickly
Answer:
malleable
Explanation:
able to be bended into shape
pH revolves around a ‘point of focus’ we call what ______________?
Answer:
Equivalence point
Explanation:
In most cases, this point has a pH value of 7, but can vary
Answer:
The answer to this question is the equivalence point which has a pH of 7. It is neither acidic or basic. Therefore, it is an equivalence point.
The summer is caused by __________.
Which phrase best completes the sentence?
Earth's far distance from the sun
direct sunlight striking Earth
Earth's closeness to the sun
indirect sunlight striking Earth
Answer:
direct sunlight striking earth
Explanation:
The seasons are caused by Earth's axis of rotation. The poles are farther away from the direct beam of sunlight, so they are normally much colder than the equator.
When a part of the globe is in direct sunlight, it gets hotter, logically, and we call that season summer.
What is the valence of oxygen
Answer:
-2
Explanation:
eACH ELEMENT HAS AN SPECIFIC VALENCE, FOR EXAMPLE, CARBON (+2),+4 IN THE CASE OF OXYGEN IS -2
NEED HELP DESPERATELY!!!
What assumption can be made about the density of two cylinders with similar masses and very different volumes?
A
mass-32
volume 23 mL
B
mass-31
volume 30 ml
PLS help ASAP
I rly don't want to fail 6th grade
Answer:
The density of tube A is greater then the density of tube B having more mass inside of the smaller area.
Explanation:
Answer:
A is denser.
Explanation:
How do yo know when your in love ?
Answer:
Play the 24 signs you're falling in love bingo I attached lol (I hope this isn't for school)
Explanation:
Ernest Rutherford discovered that atoms were mostly:
Negatively charged
Positively charged
Electrons
Empty space
Answer:
The answer is positively charged.
Explanation:
The Rutherford model supplanted the atomic model of English physicist Sir J.J. Thomson, in where the electrons were set in a positively charged atom.
Select the correct answer.
An inflatable toy starts with 1.05 moles of air and a volume of 5.17 liters. When fully inflated, the volume is 8.00 liters. If the pressure and
temperature inside the toy don't change, how many moles of air does the toy now contain?
A
2.05 mol
B. 1.62 mol
C. 1.55 mol
D. 0.679 mol
Answer:
b
Explanation:
Predict the molar volume of hydrochloric acid required to produce 55 mol of hydrogen gas at STP. A) 0.045 mol/L B) 3.7 M C) 8.9 mol/L D) 15 L
Answer:
A) 0.045 mol/L
When two or more substances are changed into different substances
O
chemical reaction
chemical equations
stoichiomety
O
freezing
Answer: A chemical reaction is a process in which some substances change into different substances. Substances that start a chemical reaction are called reactants. Substances that are produced in the reaction are called products. Reactants and products can be elements or compounds.
What are the names of the reactants in the reading
passage? 10 points
P + O2 →P4O10
Answer:
The reactants are Phosphorus and Oxygen .
Explanation:
In the equation above, P represents Phosphorus and O represents Oxygen or Oxygen gas.
Which liquid has the strongest base?
Liquid A-pH of 4.0
Liquid B-pH of 7.0
Liquid C- pH of 8.0
Liquid D-pH of 11.0
Answer:
water
Acidity and basicity are usually determined in a solvent. The strongest acid in the solvent is always the conjugate acid of the solvent and the strongest base is the conjugate base of the solvent. So, in water, the strongest acid is H3O+ and the strongest base is OH- (conjugate base of water).
1. An acetic acid solution that is 60.0% HC2H302 (by mass) contains
60.0 g acetic acid and 100.0 g water
60.0 g acetic acid and 40.0 g water
60 moles of acetic acid
60.0 g acetic acid and 60.0 g water
Answer:
A solution of acetic acid that is 60.0% HC₂H₃O₂ (by mass) indicates that it contains 60.0 g of acetic acid and 100.0 g of water.
Explanation:
A percentage is a way of expressing an amount as a fraction of 100. The mass percentage corresponds to physical units of the solutions and they allow to establish more precisely the concentration of the solutions and express them in terms of percentages.
Mass percentage indicates the amount in grams of solute per 100 grams of solution.
So a solution of acetic acid that is 60.0% HC₂H₃O₂ (by mass) indicates that it contains 60.0 g of acetic acid and 100.0 g of water.
1. What is an ecosystem!
A :All the living things on Earth
B:All the nonliving things on Earth
C:All the plants and animals that interact with each other on Earth
D:All the living and nonliving things in a place or region that interact
with each other
Answer:
The answer is D.
Explanation:
Answer:
D. All the living and nonliving things in a place or region that interact
with each other
It requires 2,500 joules to raise a certain amount of water (c = 4.186J/g°C) from 20.0°C to 65.0°C.
What is the mass of the water that is being heated?
a 80 g
b 138
c 40 g
d 158 g
Answer:
The answer above is correct - the right option is A.
Explanation:
Hope this helped confirm!
A balloon starts off with 0.00035 moles of air and has a volume of 0.0081
L. It is inflated to a size of 1.5 L, how many moles of air are in the balloon
now?
Answer:
0.0648 mols
Explanation:
An electron-pair acceptor is:
Lewis acid.
Lewis base
Arrhenius acid
Brønsted-Lowry base
Answer:
number3
Explanation:
A redox reaction always involves
A. a change in oxidation number
B. a change in phase
c. the transfer of protons
D. the formation of ions
Answer:a
Explanation: