Answer:
0.8M
Explanation:
Given parameters:
Number of moles of KNO₃ = 0.2mol
Volume of KNO₃ = 250mL
Unknown:
Molarity of the solution = ?
Solution:
The molarity of a solution is the number of moles in a given volume of a solution;
Molarity = [tex]\frac{number of moles }{volume}[/tex]
We need to convert the given volume to L;
1000mL = 1L
250mL will give 250 x 10⁻³L = 0.25L
So;
Molarity = [tex]\frac{0.2}{0.25}[/tex] = 0.8M
Answer:
0.8 M
Explanation:
The formula is mol divided by liters. Converting 250 ml to .25 liters is important. Dividing .2 by .25 gets the answer. (I swear it’s right but it’s graded wrong so take this with a grain of salt)
What mass of NH4NO3 would you need to make 250.0mL of a 0.78M solution?
A) 0.20 g
B) 13g
C) 16g
D)2.5x102g
Answer:
a
Explanation:
If an object is suspended in a fluid, neither sinking nor floating, then:
A) The buoyant force is larger
B) The buoyant force is smaller
C) The Buoyant force is equal to the density
D) The buoyant force is equal to the weight
Which sample contains the greatest number of atoms?
(a) 10.0 g He (b) 25.0 g Ne (c) 115 g Xe
What is the Rutherford experiment?
The Rutherford experiment rose above Thompson's Model 1911 with his gold-foil experiment. He designed an experiment to use the alpha particles created by a radioactive element as probes. Hope this helps you.
The volume of an ideally behaving gas is 300 L at 227°C. What volume will the gas occupy at 27°C when pressure remains constant?
Answer:
[tex]V_2=35.68\ L[/tex]
Explanation:
Initial volume, V₁ = 300 L
Temperature, T₁ = 227°C
New temperature, T₂ = 27°C
We need to find the volume of gas occupied when the temperature is 27°C.
It is based on Charle's law. A/c to Charle's law,
[tex]V\propto T[/tex] (at constant pressure)
[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{300\times 27}{227}\\\\V_2=35.68\ L[/tex]
Hence, the new volume is 35.68 L.
1. Describe in your own words what friction is.
2. Describe how friction affected the results of your investigation.
3. Does an object travel farther on a smooth or slippery surface or on a rough surface? Why?
4. Propose another experiment that could be used to demonstrate that friction is a contact force.
10 points, please hurry.
Answer
There is much more friction on the rough surface that there is on the smooth surface.
Are two atoms of the same element identical?
Answer:
Depends on if the atoms have the same amount of atomic mass and if they have the same amount of ions, or none at all.
Explanation:
They can be the same atom, but if they don't have the same amount of protons, electrons, and neutrons, they aren't identical.
Balance the following redox reaction in acidic solution.
Br (aq)+HNO2(aq)
Br2(0)+NO(9)
Answer:
2Br(aq)+2HNO2(aq)+2H(aq)------->Br2(l)+2NO(aq)+2H2O(l)
Explanation:
The given redox reaction can be balanced in acidic medium as follows:
[tex]\rm 2 Br^{-} + HNO_{2} + H^{+} \rightarrow Br_{2} +NO + H_{2}O[/tex]
What is redox reaction?A reaction involving both oxidation and reduction is called redox reaction. One species is getting oxidized here whereas another species reduces. The substance which is oxidized is called oxidant and the reduced species is called reductant.
In the given reaction of bromine gas with nitrous acid, bromine oxidizes from -1 to zero whereas nitrogen reduces from +3 to +2. The reaction can be occurred in acidic medium.
The redox reaction written in acidic medium involves H+ and water properly added to either sides. The balanced redox reaction of the given one in the acidic medium is thus as written above.
To find more on redox reaction, refer here:
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help please need now
Answer:
it is second one
Explanation:
thanks
If you change a substance into a new substance
Answer:
Explanation: Chemical changes cause a substance to change into an entirely substance with a new chemical formula. And chemical changes are also known as chemical reaction.
A student read that a block has a density of .70g/cm^3. When she tested this she got .63g/cm^3. What is her percent error
Answer:
The answer is 10 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual density = 0.7 g/cm³
error = 0.7 - 0.63 = 0.07
So we have
[tex]p(\%) = \frac{0.07}{0.7} \times 100 \\ = 10[/tex]
We have the final answer as
10%Hope this helps you
How many types of rocks can form from the rock cycle?
0 1
02
O 3
04
Answer:
Sedimentary, igneous and metamorphic
Metomorphic, heat and pressure
Sedimentary erosion and weather
Igneous magma and lave
So three!
Which process occurs in a fission nuclear reactor?
Nuclei combine.
Nuclei split apart.
Neutrons combine.
Neutrons split apart.
Answer:
Nuclear fission/ split apart
Explanation:The process of splitting a nucleus is called nuclear fission and is used in nuclear power reactors. Fission is another word for splitting.
Hope this helps! brainlyeast would only be necessary if this helped you thanks! :) have a good day!
Answer:
The correct answer is B. Nuclei split apart
Explanation:
EDGE2022
Hope is testing a substance using blue litmus paper. The paper turns red. The substance is _____.
a neutral
an acid
a base
Answer:
the substance is an acid
I want someone he is good in chemistry
Answer:
.I can help you.....Explanation:
am good atmoles
bonding
balancing equations
and set ups
If a solid has a density greater than 1 g/ml will it sink or float?
Answer:
if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float. Remember that the density of water is about 1 g/cm3.
Which unit of measurement should you use when measuring the length of an earthworm?
Answer:
kilometers.........
A lead ball has a mass of 5.910 g and a diameter of 10.0 mm. What is the density of lead in grams per cubic centimeter
Answer:
Explanation:
The formula is density = mass÷volume
Values given are:
mass = 5.910g and
diameter = 10.0 mm = 1cm
so, we need to find the volume first.
Volume of a sphere is (4/3)πr³
thus, V = 4.189 cm³
Density = mass ÷ volume
density = 5.910 ÷ 4.189
= 1.411 g/cm³
Modeling Nuclear changes
Answer:
can someone please do this and put the answers below !!!!
Explanation:
which factor is unable to determine the climate of an area
Answer:
The climate of any particular place is influenced by a host of interacting factors. These include latitude, elevation, nearby water, ocean currents, topography, vegetation, and prevailing winds.
Explanation:
those are what does not affect climate
The scientific theory of plate tectonics states that the Earth's crust is composed of many plates, or slabs of rock. Interactions of these plates have created different landforms, or geologic features. Which of the following statements provides evidence for this theory?
A.
A large earthquake off the coast of Japan induces a wave that is over twenty feet high.
B.
An iceberg buckles the hull of the Titanic and allows water to enter between the steel plates.
C.
The city of Pompeii is perfectly preserved under volcanic ash following the eruption of Mount Vesuvius.
D.
Fossilized marine creatures can be found at the top of the Himalayan Mountains.
Answer:
study island
proof
Explanation:
Fossilized marine creatures found at the top of the Himalayan Mountains provide evidence for a scientific theory of plate tectonics. Therefore, option (D) is correct.
What is Plate tectonics?Plate tectonics can be explained as the Earth's lithosphere being made of a large number of tectonic plates that have been slowly moving since about 3.4 billion years ago.
The lithosphere is broken into 7 or 8 major plates and many minor plates or "platelets". These plates meet, and their relative motion evaluates the kind of plate boundary: convergent, transform, or divergent.
Mountain-building, Earthquakes, volcanic activity, and oceanic trench formation take place along these plate boundaries. The relative annual movement of the plates ranges from 0 to 10 cm.
Tectonic plates are comprised of the oceanic and the thicker continental lithosphere. The process of subduction which is actually one plate moving under another carries the edge of the lower plate down into the mantle along convergent boundaries.
Pebbles, Shells, and marine fossils found in the limestone beds of the tallest Himalayas Mountains give evidence of the theory of plate tectonics.
Learn more about plate tectonics, here:
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As the vibration of molecules increases, the _____ of the substance increases.
temperature
internal energy
kinetic energy
all of the above
Answer:
Answer option D- all of the above
Which state of matter is found in stars and does not contain electrons within its atoms
Answer:
Interstellar medium (ISM)Explanation:
In astronomy, the interstellar medium (ISM) is the matter and radiation that exists in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, as well as dust and cosmic rays.
I tried, I hope it helps :)
6. Which of the following units would be MOST appropriate for measuring
the length of a car?*
1 poin
A. Millimeters
B. Centimeters
C. Meters
D. Kilometers
7. Which of the following units would be MOST appropriate for measuring
1 point
Answer:
Meter
Explanation:
+
Hele Oqt7nOo (Oettin
Answer:
omggggggggg that is sooo confusing what grade are you in?
The image below shows uncharged particles bouncing around.
State of Matter
Which state of matter is most likely represented in the image? (5 points)
Gas
Solid
Liquid
Plasma
This problem is providing information about the states of matter and a given diagram showing a molecular arrangement it has. Thus, we can start off by analyzing the attached file, which shows molecular arrangements and movements each state exhibits.
Solids are quite organized so that they are able to form molecular networks in which molecules vibrate but do not displace anywhere. Liquid molecules are close enough to have small movements and vibrations but are not able to form any organized network.
Gases, however, exhibit no molecular organization but large movements inside the container whose walls the gas constantly crash against. Plasma do not have any order neither yet it contains ions.
In such a way, since the given diagram do not have any apparent order or ion, we infer this is about a gas that moves into the container and crash against its walls.
Learn more:
https://brainly.com/question/18538345https://brainly.com/question/9402776are all physical reactions reversible?
A) No, while some such as freezing are, others, such as breaking glass aren't.
B) Yes, every single one of them are!
Answer: answer is A
Explanation:
Which best describes the purpose of a controlled experiment?
to make sure the results of the experiment support the hypothesis
to prevent a dangerous condition resulting from a reaction
to examine whether one variable causes a change in another
to prevent an undesired change in a variable
Answer: To examine whether one variable causes a change in another
Explanation:
which element has the largest atomic radii in the 3rd period of the periodic table?
Answer:
Sodium (Na)
Explanation:
How many atoms of each element are in 4Na3PO4?
Answer:
12 sodium 4 phosphorus 16 oxygen. makes the table below to determine the number of atoms of each element in the chemical formula 4Ca(ClO3)2.