Answer:
2
Explanation:
1. Take 2-3 crystals of potassium permanganate and dissolve them in 100 mL of water.
2. Take out approximately 10 mL of this solution and put it into 90 mL of clear water.
3. Take out 10 mL of this solution and put it into another 90 mL of clear water.
4. Keep diluting the solution like this 5 to 8 times.
5. Is the water still coloured?
How can sound waves be used to put out fire
Define the term metal ore
Answer:
Ore is a deposit in Earth's crust of one or more valuable minerals. The most valuable ore deposits contain metals crucial to industry and trade, like copper, gold, and iron
The naturally occurring material from which a mineral or minerals of economic value can be extracted.
A car with a mass of 3,500lbs accelerates negatively from 35m/s to 8m/s in 8s. What is the
car's negative acceleration?
Answer:
[tex]a=-3.37\ m/s^2[/tex]
Explanation:
Given that,
A car accelerates negatively from 35m/s to 8m/s in 8s.
We need to find the car's acceleration.
Initial speed, u = 35 m/s
Final speed, v = 8 m/s
Time, t = 8 s
The acceleration of an object is equal to the rate of change of velocity. So,
[tex]a=\dfrac{v-u}{t}[/tex]
Put all the values,
[tex]a=\dfrac{8-35}{8}\\\\a=-3.37\ m/s^2[/tex]
So, the acceleration of the car is equal to [tex]-3.37\ m/s^2[/tex].
an archer releases an arrow toward a Target the arrow travels 166 m in 2 seconds what is the speed of the arrow
the speed of arrow is 83m/per second
that means
83metres = 1 second
●The arrow would cover the distance of 83 metres in 1 second
may this helps you
bye
6. Find the number of molecules in 33.6 L of co, at STP? What is the name
of this compound?
!!!!!!PLEASE HELP!!!!!!!!!!
Which organisms are consumers?
Select all correct answers.
mushrooms
monkey
grasshopper
bacteria
snake
Answer: snake grass hopper and monkey
Explanation: i took the test and this is what i got
Answer:
snake grasshopper and monkey
Explanation:
Which of the following is a property of elements?
O
Elements have at least two different types of atoms.
Elements have their own individual characteristic properties.
Elements are can be separated from one another.
Elements have the ability to change into a different element.
A box slides with an initial speed of 4.0 towards a spring on a frictionless horizontal surface. When the box
S
N
hits a spring with spring constant k = 150 the spring compresses by 0.30 m.
m
m
M
What is the mass of the box?
Answer: .84kg
Explanation:
Khan academy
A box slides with an initial speed of 4.0 kg m/s towards a spring on a frictionless horizontal surface. When the box hits a spring with spring constant k = 150 N/m, the spring compresses by 0.30 m.
What is the mass of the box?
Answer: 0.54 kg
What happens to food we eat?
Answer:
It goes through our digestive system then though our bladder.
Answer: When we eat the food gets digested.
Explanation: Once filled with food, the stomach grinds and churns the food to break it down into small particles. It then pushes the small particles of food into the first part of the small intestine, called the duodenum. The small intestine is where most of the digestion and absorption of our food takes place.
What makes an atom stable?
a. Having the nucleus in the center
b. Being very small
c. Being neutral
d. Having the right number of protons and neutrons
4. What is the volume of 6.5 moles of Helium at STP?
|
Answer:
Volume of 6.5 moles of Helium at STP is 145.6954 L
Explanation:
As we know
[tex]pV = nRT[/tex]
At STP, temperature is 273.15 K and pressure is 1 atm
n is the number of moles which is equal to 6.5
R is the gas constant = 0.08206 L atm/K mol
Substituting the given values in above equation, we get -
[tex]1 * V = 6.5 * 0.08206 * 273.15\\V = 145.6954[/tex]Liters
Volume of 6.5 moles of Helium at STP is 145.6954 L
What is the empirical formula for a compound that has 1.5 moles of copper and 0.5 moles of phosphorus?
Answer:
[tex]Cu_{3}P[/tex]
Explanation:
usually, the first step is to calculate the moles but since that is already given in the question we can move onto the next step
least molar ratio:
Cu = [tex]\frac{1.5}{0.5}[/tex] = 3
P = [tex]\frac{0.5}{0.5}[/tex] = 1
thus, empirical formula = [tex]Cu_{3}P[/tex]
The empirical formula for a compound that has 1.5 moles of copper and 0.5 moles of phosphorus is Cu₃P.
What is the empirical formula?Empirical formula of any compound gives idea about the number of constituents particles present in that compound by mentioning the ration.
In the question, given that:
Moles of copper = 1.5 moles
Moles of phophorous = 0.5 moles
Now we divide the given moles by the smallest number to get the ration number as follow:
Cu : P
1.5/0.5 : 0.5/0.5
3 : 1
Hence, required empirical formula is Cu₃P.
To know more about empirical formula, visit the below link:
https://brainly.com/question/1603500
Calculate the molar mass of HCI.
Haley has been having difficulty breathing. She is having difficulty with the gas exchange in the respiratory system. Which organ is being affected?
Answer:
Lungs.
Explanation:
This is because the lungs are respiratory organs in the body that are located at the either side of the thorax or chest. These are organs that are incharge of exchange of gases. The air is breathe in through the trachea i.e oxygen is inhaled and carbondioxide which is the waste product is exhaled. Gas exchange take place in the lungs.
Please please help me!! It needs to be turned in in a few minutes!
Answer:
D. Thermal
Thermal is another energy the match gives off
What is the pH of a 0.30 M solution of Ca(OH)2?
Explanation:
30 to the second power
4Fe+3O2 →2Fe2O3
80.0 grams of iron are reacted with 50.0 grams of oxygen gas. Which of these reactants are the limiting reactant, and how many grams of iron (III) oxide would be produced?
Answer:
FFe
2
O
3
(
s
)
+
3
CO
(
g
)
→
2
Fe
(
s
)
+
3
CO
2
(
g
Explanation:
How many grams of NaOH are produced from 2.1g of Na2O?
Na2O + H20 --> 2NaOH
Answer:
2.72g
Explanation:
The balanced equation of this reaction is given as follows:
Na2O + H20 --> 2NaOH
Based on this balanced equation, 1 mole of Na2O will produce 2 moles of NaOH.
First, we need to convert mass of Na2O into moles by using the formula;
mole = mass/molar mass
Molar mass of Na2O = 23(2) + 16
= 46 + 16
= 62g/mol
mole = 2.1g/62g/mol
mole of Na2O = 0.034mol
Hence, if 1 mole of Na2O will produce 2 moles of NaOH.
Then, 0.034mol of Na2O will produce (0.034 × 2) = 0.068mol of NaOH.
To convert mole of NaOH to mass, we use;
mole = mass/molar mass
Molar mass of NaOH = 23 + 16 + 1 = 40g/mol
0.068 = mass/40
mass of NaOH produced = 2.72g.
pls help and show work!!!
Answer:
44.9g
Explanation:
You have to convert grams of CH4 to moles, use the mole-to-mole ratio of CH4 to water, and convert back to grams.
(20.0g CH4)(1 mol CH4/16.04g)(2 mol H2O/1 mol CH4)(18.01 g H2O/ 1 mol) = 44.9127 g
Hope this helps!
Horticulture 100 POINTS Hurry
Which of the following is an example of an indirect expense?
A. corn oil
B. animal fodder
C. export commodity
D. snack foods
Answer:
B!
Explanation:
Answer:
i know im late but i just really want the points. the answer is b.
Explanation:
What is the normality of a 2.0 M NaOH solution?
Answer:
Normality= molarityX total POSITIVE oxidation number of solute Solvent=substance present in the greatest amount Solute= all other substances in the solution +1 (1 na+) is the total POSITIVE oxidation number of NaOH 2.0X1= 2.0 N=2.0
Explanation:
I had the same question on one of my assignments earlier
How many grams of solid iron will be produced from 32.1 grams of iron (III) oxide? Hint: Balance the equation first
Answer:
22.45g of Fe will be produced
Explanation:
The balanced reaction is:
Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g)
Where 1 mole of Iron (III) oxide reacts with 2 moles of Iron
To solve this question we have to find the moles of iron (III) oxide. With these moles and the balanced reaction we can find the moles of iron produced and its mass:
Moles iron (III) oxide -Molar mass: 159.69g/mol-
32.1g Fe₂O₃ * (1mol / 159.69g) = 0.201 moles Fe₂O₃
Moles Iron:
0.201 moles Fe₂O₃ * (2mol Fe / 1mol Fe₂O₃) = 0.402 moles of Fe
Mass Fe -Molar mass: 55.845g/mol-
0.402 moles of Fe * (55.845g/mol) =
22.45g of Fe will be producedYou heat 100 mL of water and 1000 mL of water using 40,000 joules of energy. What would be the outcome of this experiment? *
A. The 100 mL of water would be a higher temperature than the 1,000 mL of water.
B. The 100 mL of water would be a lower temperature than the 1,000 mL of water.
C. They would both be the same temperature.
D. There is not enough information
Answer:
A. The 100 mL of water would be a higher temperature than the 1,000 mL of water.
Explanation:
Since the volume of water affects temperature, when the volume increases this results in a lower temperature. This means that the water with the smaller volume will have a higher temperature.
2 H2 (g) + O2 (g) --> 2 H2O (l)
How many moles of hydrogen gas do you need to make 2 moles of liquid water?
Answer:
2H2(g]+O2(g]→2H2O(l]]. Notice that the reaction requires 2 moles of hydrogen gas and 1
Explanation:
How are Earth;s Days, Years, and Season’s related to the way Earth moves in Space?
what is molarity ? also write its formula ?
Answer:
Definition:
Molarity of a given solution is defined as the total number of moles of solute per litre of solution. The molality of a solution is dependent on the changes in physical properties of the system such as pressure and temperature as unlike mass, the volume of the system changes with the change in physical conditions of the system. Molarity is represented by M, which is termed as molar. One molar is the molarity of a solution where one gram of solute is dissolved in a litre of solution. As we know, in a solution, the solvent and solute blend to form a solution, hence, the total volume of the solution is taken.
Formula :
[tex]m \: = \frac{n}{v} [/tex]
Where,
m = molar concentration
n = moles of solute
v = litres of solution.
2-ciclopropilpropano
Answer:
cool
Explanation:
What is a peer review? *
A. A summary of results from several different experiments
B. A presentation of scientific ideas
C. group of scientists that analyze scientific experiments
D. The errors in an experiment
Answer: Hewo, there! your Answer is Below
C. group of scientists that analyze scientific experiments
Explanation:
the process of someone reading, checking, and giving his or her opinion about something that has been written by another scientist or expert working in the same subject area, or a piece of work in which this is done: All these papers have been published after being subjected to peer review.
Hope this Helps you !!!
Have a great day!!!
A pool float was filled with air to capacity in the middle of a hot day. The next morning the pool float looked different yet no gas escaped or entered the float. Describe what you think the float looked like in the morning and why it occurred.
Answer:
The pool float looked would have looked deflated the next morning.
Explanation:
When temperature decreases the volume decreases
Answer:
The pool float most likely looked a little deflated or pushed in
Explanation:
The pool float most likely looked a little deflated or pushed in. This is because during the night temperatures most likely dropped. These cold temperatures during the night would have caused the air molecules inside the pool float to come closer together which would cause there to be more excess space inside the pool float. Therefore, allowing it to collapse into itself. This would be far worse if the float was filled with helium or another gas other than O2.
Which substances are compounds? Please help
Answer:
1 and 3
Explanation:
oh this one lol,, hope it helps
Answer:
1 and 3
Explanation:
hope this helps :)