I believe the control group is what doesn't change in the experiment, and the experimental group is what is being tested / receives the treatment :)
write a paragraph on: how Westfield how the rust in their water formed.
Answer:
Students have investigated what's going on in the fictional town of Westfield, they learned that the mysterious reddish-brown substance in the water is actually rust, which formed because of a chemical reaction between the iron pipes and the fertilizer substance in the water.
Explanation:
What will happen to the Sun in approximately 5.5 billion years?
Answer:
This lifespan began roughly 4.6 billion years ago, and will continue for about another 4.5 – 5.5 billion years, when it will deplete its supply of hydrogen, helium, and collapse into a white dwarf.
Explanation:
Got this from the internet lol
why does his apple tastes less sour after 15 days
Answer:
Maybe because that he ate the apple when it wasn't ready or fully grown yet just like bannans if bannanas are green that means that they are still growing so maybe that why it tasted sour or prob because he ate an green apple because thos apples are sour.
The mass of 0.10 mole of methane
Answer:
A methane molecule is made from one carbon atom and four hydrogen atoms. Carbon has a mass of 12.011 u and hydrogen has a mass of 1.008 u. This means that the mass of one methane molecule is 12.011 u + (4 × 1.008u), or 16.043 u. This means that one mole of methane has a mass of 16.043 grams.
メタン分子は、1つの炭素原子と4つの水素原子から作られています。炭素の質量は12.011uで、水素の質量は1.008uです。これは、1つのメタン分子の質量が12.011 u +（4×1.008u）、つまり16.043uであることを意味します。これは、1モルのメタンの質量が16.043グラムであることを意味します。^>^
The mass of 0.10 mole of methane (CH4) is 1.6grams.
HOW TO CALCULATE MASS?The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass. That is;
mass = moles × molar mass
According to this question, there are 0.10 mole in methane (CH4). The molar mass of CH4 is 16g/mol.
Mass of CH4 = 0.10 × 16
Mass of methane = 1.6grams.
Therefore, the mass of 0.10 mole of methane (CH4) is 1.6grams.
Learn more about mass at: https://brainly.com/question/19694949
Which of the following is deforestation most likely to cause?
A.
an increase in the amount of soil on Earth
В.
an increase in the amount of minerals on Earth
C.
an increase in the amount of carbon dioxide in Earth's atmosphere
D
an increase in the amount of ozone in Earth's atmosphere
Answer:
C
Explanation:
trees (as well as other plants) produce carbon dioxide. deforestation is the removal of trees. this will not cause an increase in any pollutants such as ozone. ozone is made from VOCs and other harmful pollutants, and not caused by trees. tearing down trees will also not create more soil. So the answer has to be C
Indicate whether each statement is true or false. Drag the appropriate statements to their respective bins. the octet rule is based on the fact that filling in all s and p valence electrons in a shell gives eight electrons. compounds in which nitrogen is the central atom are frequent exceptions to the octet rule because they have too many electrons surrounding the nitrogen. boron compounds are frequent exceptions to the octet rule because they have too few electrons surrounding the boron. the si in sih4 does not follow the octet rule because hydrogen is in an unusual oxidation state.
Answer:
the octet rule is based on the fact that filling in all s and p valence electrons in a shell gives eight electrons--- True
boron compounds are frequent exceptions to the octet rule because they have too few electrons surrounding the boron......True
compounds in which nitrogen is the central atom are frequent exceptions to the octet rule because they have too many electrons surrounding the nitrogen...... false
the si in sih4 does not follow the octet rule because hydrogen is in an unusual oxidation state......false
Explanation:
The octet rule simply means that atoms tend to be stable when they have eight electrons in their outermost shell. This rule mostly applies to the s and p orbitals and not to the d and f orbitals. The sum of the total electrons in the outermost s and p orbitals is often equal to eight for an atom to be considered stable, for example, the noble gases.
Boron often forms compounds which has less than eight electrons around the boron central atom because the compounds of boron often have a sextet of electrons owing to the fact that boron is trivalent and forms mostly covalent compounds.
Nitrogen compounds mostly obey the octet rule and do not have excess electrons. The oxidation state of hydrogen in SiH4 is not unusual.
please help me asap. NO LINKS I WILL REPORT YOU!!!!
the galvanometer is not measuring any electricity despite all wires being hooked up. Why could this be?
Answer: you can find out information about Wheatstone bridge.
Explanation: maybe resistors are adjusted such a way that current through
Galvanometer is zero. There is no picture.
Answer:
mmh maybe the connections arent right
Explanation:
coz when u mess up even a bit current wont flow
Describe how ultrasonic waves help ships navigate and how ultrasonic waves can be used for medical purposes
How many moles of NaCl are found in 5.2L of a 0.75 M solution?
Answer 4.45 moles
Explanation:
A fire that is burning wood will release water vapor and carbon dioxide
true or false?
Answer:
true.
Explanation:
Definition:This is a type of lab equipment in which students use probes, interfaces, and software for real-
time data acquisition, display, and analysis with a computer or calculator
What is the term?
Describe what happens to the molecules in the ice as temperature of the ice increases
Answer:
When you heat ice, the individual molecules gain kinetic energy, but until the temperature reaches the melting point, they don't have energy to break the bonds that hold them in a crystal structure. They vibrate more quickly within their confines as you add heat, and the temperature of the ice goes up.
Answer:
As energy is transferred to the water molecules in the ice, the motion of the molecules increases. The motion of the molecules increases enough that it overcomes the attractions the water molecules have for each other causing the ice to melt.
how do you balance _KCIO3 + __P4 → _P4010 + ___KCI
How does temperature differ from heat?
Answer:
Heat is a specific spectrum of the temperature scale while temperature is a lot broader
Explanation:
Hello, I need help in this part of chemistry, I need the chemical names of the following four:
1) B and F3
2) Se and I2
3) As2 and Se3
ASAP! Please,,,
How many moles do I have of Lithium if I have 116.3g
Answer:
16.85mol
Explanation:
The number of moles of a substance can be calculated by dividing the mass of that substance by its molecular mass. That is;
number of moles (n) = mass (m) /molar mass (MM)
Molar mass of lithium = 6.9g/mol
Hence,
number of moles = 116.3 ÷ 6.9
Moles = 16.85mol
Therefore, 16.85moles is present in 116.3g of Li.
Read the temp what is it?
17.3 or 17.25??
Answer:
I would say 17.25.
Explanation:
The temperature of 200 mL of gas originally at STP is changed to –25o C at constant volume. Calculate the final pressure of the gas in mmHg.
Answer:
691.6 mmHg
Explanation:
At standard temperature and pressure, temperature of a system = 273K, and pressure= 1atm
T1= 273.15K
P1= 1atm
T2= (–25°C +273.15 )= 248.15K
From Gay-Lussac's law which expressed that at constant volume, pressure of a particular mass of gas is directly proportional to temperature . It can be expressed as
P1 / T1 = P2 / T2
Where P1= initial pressure
T2= final temperature
T1= initial temperature
P2= final pressure
Making P2 subject of the formula
P2= (P1 × T2)/ P1
Substitute the values we have
P2= (1 atm × 248.15K)/273.15
P2= 0.91 atm
But
1atm= 760 mmHg
0.91 atm= X mmHg
If we cross multiply we have
X mmHg= (760× 0.91)/1
= 691.6 mmHg
Hence, the final pressure of the gas in mmHg is 691.6 mmHg
I need help with my science project someone help me answer it!
Answer:
food
Explanation:
How much did the total amount of discarded clothing and other fabrics increase from 1960
to 2018?
Answer:
Around 17,000,000 or a little more than that
CSI blood drop I need help please I don’t find any answers in the episode
A 1.26 g sample of He gas has a pressure of 0.123 arm and a volume of 32.6 L. What is the temperature of the sample, in degrees Celsius
A 1.26 g sample of He gas has a pressure of 0.123 arm and a volume of 32.6 L, then the temperature of the gas is -117.7 degree C.
How do we calculate the temperature of gas?Temperature of any gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure of gas = 0.123 atm
V = volume of gas = 32.6 L
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature of gas = ?
n is moles of He gas and will be calculated as:
n = W/M, where
W = given mass = 1.26g
M = molar mass = 4 g/mol
n = 1.26 / 4 = 0.315 moles
On putting values we get,
T = (0.123)(32.6) / (0.315)(0.082)
T = 155.41 K = 155.41 - 273.15 = -117.7 degree C
Hence required temperature of the helium sample is -117.7 degree C.
To know more about ideal gas equation, visit the below link:
https://brainly.com/question/25290815
A sample of gas is kept at a temperature of 300 k, a volume of 1.45L, and a pressure of 3.00 kPa. How many moles of has are in the sample
Answer:
the number of moles of the gas is 0.00174 mol.
Explanation:
Given;
temperature of the, T = 300 K
volume of the gas, V = 1.45 L
Pressure of the gas, P = 3.0 kPa
The number of moles of the gas is calculated using Ideal gas equation, as follows;
PV = nRT
Where;
n is number of moles of the gas
R is the ideal gas constant, = 8.315 L.kPa/mol.K
n = PV / RT
n = (3 x 1.45) / (8.315 x 300)
n = 0.00174 mol.
Therefore, the number of moles of the gas is 0.00174 mol.
DUE IN AN HOUR PLS HELP WILL SEND MONEY THRU CASHAPP
Can you help me please
Answer:
11.5 or 11.52, depending on however many decimal places you round it to
Explanation:
the equation for mass ( using the specific heat capacity equation) is energy transferred divided by temperature change x the specific heat capacity.
so, we do 725 ÷ 32° (the temp change) x 2.03 = 11.52 or 11.5, depending on how many decimal places you round to
i would round to 2 decimal places, so the answer would be 11.52kg.
mass is measured in kg :) hope this helped.
A 4.5L container of gas has a pressure of 3.0 atm at a temperature of 100 C. The container is expanded to 6L, and the temperature is increased to 200 C.
A) 2.85 atm
B) 5.3 atm
C) 1.05 atm
D) 100 K
How many moles of gas is contained in 2.21 L at STP?
Answer:
its an helium gas are contained in a 4.0L at STP? 0.17
Explanation:
because the elements in column 2.21 is what quantity of gas in holes
PLEASE HELP ME ASAP!!!!!!!!!!!!!
The behavior of an organism is influenced A. only by the organism's life experiences. B. only by the organism's evolutionary history. C. by both the organism's evolutionary history and its life experiences. D. by neither the organism's evolutionary history nor its life experiences.
Organisms are more closely related to the species that they share the most DNA with
True or False
Answer:
True
Explanation: