Answer:
true
Explanation:
What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=8.2×10 −7 M?
Answer:
6.1
Explanation:
From the question given above, the following data were obtained:
Hydrogen ion concentration [H⁺] = 8.2×10¯⁷ M
pH =?
The pH of the solution can be obtained as follow:
pH = –Log [H⁺]
pH = –Log 8.2×10¯⁷
pH = 6.1
Thus, the pH of the solution is 6.1
Pls someone help me with this question pls
Water is an essential molecule to life on Earth. Which of the following is not a property of water that is critical to biological life?
1. surface tension
2. density
3. temperature
4. viscosity
The property of water that is not critical to biological life is surface tension.
What is biological life?Biological life means the life in which living organism do exist and for their survival they mainly depends on water and air.
The main critical properties that water should posses to biological life are density, temperature, cohesive force and adhesive force. Viscosity is also understand by the cohesive force because more attraction between atoms more viscous they are.
Hence option (1) is correct i.e. surface tension.
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what is independent variable
Answer:
a variable (often denoted by x ) whose variation does not depend on that of another.
Explanation:
You can think of independent and dependent variables in terms of cause and effect: an independent variable is the variable you think is the cause, while a dependent variable is the effect. In an experiment, you manipulate the independent variable and measure the outcome in the dependent variable.For example, someone's age might be an independent variable. Other factors (such as what they eat, how much they go to school, how much television they watch) aren't going to change a person's age.
The diagram shows that the boiling point of water is 100°C At a pressure of one atm.
How could you reduce the boiling point of water in this system?
A. Increase the size of the flame
B. Decrease the volume of the water
C. Decrease the pressure to 0 atm.
D. Increase the pressure to 2 atm
Answer:
I think the answer will be number A
The boiling point of a substance is constant and for water it is 100 degree celsius. However by reducing the surrounding pressure the boiling point can be reduced.
What is boiling point ?Boiling point of a substances is the temperature at which the vapor pressure of the gas phase above the liquid equals to the atmospheric pressure where, the liquid converts to the vapor state.
Boiling point depends on the bond type, molar mass, temperature and pressure. As the and pressure increases, boiling point increases. Similarly with an increasing mass and more strength intermolecular force results in greater boiling point.
As the atmospheric pressure decreases, the temperature needed to equalise the vapor pressure of the gas phase over the liquid also decreases. Hence, boiling point decreases. Therefore, option C is correct.
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please answer asap!
What is the molarity of a KOH solution if 200 ml of the solution contains 0.6 moles KOH?
a. 0.3 M
b. 0.6 M
c. 3.0 M
d. 6.0 M
If you are given 96.0 grams of O2, how many grams of H20 are made?
Answer:
10.66 grams
Explanation:
Addition of sugar to water will result in increase of boiling point
TRUE OR FALSE
Answer:
true
Explanation:
What is TRUE about the majority of explosives that forensic scientists deal with in investigations?
А.
They are made of dynamite and TNT.
B.
They are Molotov cocktails.
C. They use high explosives.
D.
They are homemade bombs.
Answer:D
Explanation:
The majority of explosives that forensic scientists deal with in investigations are homemade bombs. Therefore, option D is correct.
What are forensic scientist ?In general, forensic scientists do the following kinds of work: They examine tangible materials gathered from crime sites. They offer forensic expert testimony both before and during court proceedings. Blood, hair, and other trace evidence are gathered by investigators and sent to crime labs for analysis.
Criminalists or crime scene investigators are generalist forensic science technicians that gather evidence at the scene of a crime and conduct scientific and technical examination in labs or offices.
A forensic scientist's key responsibilities include gathering evidence at the crime scene, documenting the findings in reports, processing the evidence at the lab, and giving testimony in court.
Thus, option D is correct.
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oi oi oi oi ewin
.................
Imagine the following scenario involving marbles as "radioactive isotopes".
Let's say the half-life of green marbles is 1 million years.
In one hand, you're holding 2 green marbles. In your other hand, you're holding 500,000 green marbles.
Hypothetically, noting that we have two different starting amounts of "isotopes", how long will it take for half of each amount to decay?
Answer:
1 million years
Explanation:
The half life of a radioactive isotope refers to the time it takes for the radioactive isotope to decay to half of its original amount.
The half life of a radioactive isotope is independent of the amount of starting material. Hence, whether the amount of starting material is small or large, the half life of the substance remains the same.
Hence the half life of 2 green marbles and 500,000 green marbles is 1 million years.
Your friend had an upset stomach caused by indigestion. His mother explained to him
that indigestion is when the contents in the stomach are too acidic. She also told him to
drink soda to settle his stomach. The soda did not help. You tell him that you would not
have expected the soda to help with the indigestion based on what you know about
acids and bases.
ليالي
Baking Soda
Acidic
Neutral
Basic
Explain why soda would not help settle your friend's stomach. In your reponse, be sure
to include:
• a better alternative to drinking soda.
• how each substance above would react with the stomach acid.
• defining characteristics of acids and bases, besides how they react.
Be sure to consider the completeness of your response, supporting details, and accurate
use of terms.
Answer:
because it may cause burn that causes acid to build up which causes you to keep having an upset stomach
keeping a bike indoor will stop it rusting true or false
Answer: True because if you leave it outside and it rains on the bike it will cause rust. Keep it in the garage or something. :) I have a bike btw.
Explanation:
The best way to prevent rusting is to store your bike safely away when it isn't being used and apply a rust-proofing lubricant to protect it when you are riding it – enjoying those wet and wild rides guilt-free!
so true
The molar mass of two equally sized samples of unknown gaseous compounds is shown in the table.
Molar Mass Comparison
Gas Molar Mass
X 28 g/mol
Y 44 g/mol
At STP, which describes the density and effusion of both gases? (4 points)
a
Gas X has a higher density and effuses faster than Gas Y.
b
Gas X has a higher density and effuses slower than Gas Y.
c
Gas X has a lower density and effuses slower than Gas Y.
d
Gas X has a lower density and effuses faster than Gas Y.
Answer:
D. Gas X has a lower density and effuses faster than Gas Y.
Explanation:
I took the test.
Lower Density = effuse/ diffuse fasterLower Molar Mass = effuse/ diffuse fasterGas X has a lower density and effuses faster than Gas Y. Hence, option D is correct.
What is density?Density is the amount or the number of entities that can be contained in an area. It is denoted by ρ and is calculated as,
ρ = Mass ÷ Volume
Diffusion is the process of movement of a substance from the area of higher concentration to the area of lower concentration.
Effusion is the process of a gas being poured out through a hole diametrically smaller than the structural exit of the container.
The gas with a smaller mass will diffuse slower in rate than the gas with a higher mass.
Hence, Gas X has a lower density and effuses faster than Gas Y.
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Why does the N2 molecule in this room have a greater average velocity
than the O2 molecules in the same room?
Answer:
Explanation:
The temperature will only move the average velocity of all the molecules in the room. There is a limitation. The O2 molecules are heavier than the N2 molecules. The lighter the molecules, the faster they are going to move on average.
Help i just need people to answer the question today
Answer:
1) Hydrogen
2) Methane
3) Carbon
4) Structural isomer
5) Ethene also known as ethylene
6) Hydrocarbons are widely used as fuel
7) Crude oil
Explanation:
Compute the mass of KI needed to prepare 500 mL of a 0.750 M solution.
Answer:
62 grams
Explanation:
Molarity=mol/liter
We have mL and Molarity
500 mL * 1 L/1000 mL=0.5
Plug 0.5 in and solve for moles
0.75=mol/0.5
0.75*0.5=0.375 mol
Convert to grams by finding the mass of KI: 39+126.9= 165.9 grams
0.375 mol KI * 165.9 grams KI/1 mol KI= 62.2125 grams
The mass of KI needed is 124.5 grams, this can be calculated by adding the values in molarity formula.
What is Molarity?It is defined as number of moles of solute over volume of solution in liters.
It is given by:
M = n/ V
What information do we have?
Molarity= 0.750 M
Volume = 500 mL= 1 L
Molar mass of KI = 166 g/mol
To find:
Mass of KI=?
On substituting the values:
M= n/V
0.750 M= n/ 1 L
n= 0.750 M* 1l
n= 0.750 moles
Number of moles is the ratio between mass and molar mass.
n= m/M
0.750 moles = m/ 166 g/mol
m= 0.750*166
m= 124.5 grams.
Thus, the mass of KI needed is 124.5 grams.
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What determines the degree of polarity in a bond?
Answer:
The relative electronegativity of the two bonded atoms determines the polarity of a bond. If the difference in electronegativities between the two atoms is less than 0.4, the bond is nonpolar covalent. ... If the difference in electronegativities between the two atoms is more than 2.0, the bond is ionic.
Give an example of a model used in Earth science. Explain why models are particularly important to this field.
Answer:
Some examples include maps and globes. Conceptual Models - These models serve as a tool to piece together a variety of concepts together so that we can better conceptualize the phenomena under investigation.
Scientific models are used to explain and predict the behaviour of real objects or systems and are used in a variety of scientific disciplines, ranging from physics and chemistry to ecology and the Earth sciences
Steve and Meg are doing an experiment where they need to make 37 grams of Fe2O3. How many grams of Fe would they need ?
Answer:
25.9g
Explanation:
Molecular mass of Fe₂O₃ = (56 * 2) + (16 * 3)
= 112 + 48 = 160
Let's follow the unitary method now
In 160g Fe₂O₃ , there is 112 g Fe
In 1 g Fe₂O₃ , there is 112 / 160 g Fe
In 37 Fe₂O₃ , we need 112 * 37 / 160
= 25.9 g Fe
Which of the following limits a population's growth?
Answer:
hereeee
Explanation:
Limitations to population growth are either density-dependant or density-independent. Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size.
Answer: environmental factors
Explanation:
tiny sacs in the lungs where gas exchange takes place are called ____?
Answer:
Alveoli
Explanation:
I hope this helps you.
Can someone please help me, i just need help =(
Answer:
The answers to your questions are given below
Explanation:
F. Determination of the missing part of the equation.
_ I₂ + _Na₂S₂O₃ —> _ NaI + _ Na₂S₄O₆
The above equation can be balance as illustrated below:
I₂ + Na₂S₂O₃ —> NaI + Na₂S₄O₆
There are 2 atoms of I on the left side and 1 on the right side. It can be balance by writing 2 before NaI as shown below:
I₂ + Na₂S₂O₃ —> 2NaI + Na₂S₄O₆
There are 2 atoms of Na on the left side and a total of 4 atoms on the right side. It can be balance by writing 2 before Na₂S₂O₃ as shown below:
I₂ + 2Na₂S₂O₃ —> 2NaI + Na₂S₄O₆
Now the equation is balanced.
The coefficients are: 1, 2, 2, 1
Elements >>> Reactant >>> Product
Sodium >>>>> 4 >>>>>>>>> 4
Sulphur >>>>> 4 >>>>>>>>> 4
Oxygen >>>>> 6 >>>>>>>>> 6
Iodine >>>>>> 2 >>>>>>>>>> 2
G. Determination of the missing part of the equation.
__ Mg + __P₄ —> __Mg₃P₂
The above equation can be balance as illustrated below:
Mg + P₄ —> Mg₃P₂
There are 2 atoms of P on the right side and 4 atoms on the left side. It can be balance by writing 2 before Mg₃P₂ as shown below:
Mg + P₄ —> 2Mg₃P₂
There are 6 atoms of Mg on the right side and 1 atom on the left side. It can be balance by writing 6 before Mg as shown below:
6Mg + P₄ —> 2Mg₃P₂
Now the equation is balanced.
The coefficients are: 6, 1, 2
Elements >>>> Reactant >>> Product
Magnesium >> 6 >>>>>>>>> 6
Phosphorus >> 4 >>>>>>>>> 4
1 Write the chemical symbols for following elements: Nitrogen-
Phosphorus- bromine- Zinc-Potassium-Magnesium.
Answer:
Look below
Explanation:
Nitrogen: N
Phosphorus: P
Bromine: Br
Zinc: Zn
Potassium: K
Magnesium: Mg
Hope this helps(would be very grateful if you mark this answer branliest bc i need for lvl up)
An alternating current complete 100 cycles in 0.1s. it's frequency is
Answer:
The frequency is 1000 cycles/s
Explanation:
An alternating current is an electrical current in which the current changes its magnitude and the sense cyclically. The frequency of this current is defined as the cycles that the current completes in one second.
As the current completes 100 cycles in 0.1 seconds, the frequency is:
100 cycles / 0.1s = 1000 cycles /s
The frequency is 1000 cycles/shelp me plss plss.plsss.plsssplss plsss.plsss plsss plsss plsss
Answer:
1. Distance = 5 cm
Displacement = 1 cm
2. Distance = 7 cm
Displacement = 1 cm
3. Distance = 5 cm
Displacement = -1 cm
4. Distance = 6 cm
Displacement = -2 cm
5. Distance = 4 cm
Displacement = 0 cm
Explanation:
The distance an object travels is a measure of the total ground cobpvered bybthe object without regard to the direction of motion. It is a scalar quantity as it only takes into account magnitude but not the direction of a quantity.
Displacement however, is a measure of how far away or apart an object is from its starting position. It a vector quantity as it takes into account both the magnitude and direction in its measurement.
From the attachment provided, considering forward direction as positive and reverse as negative :
1. When a object moves from point 1 to point 4 and reverses to point 2.:
Distance = from 1 to 4 = 3 cm; from 4 back to 2 = 2 cm; 3 + 2 = 5 cm
Displacement = from 1 to 4 = +3 cm; from 4 back to 2 = -2 cm; 3 - 2 = 1 cm
2. When an object moves from point 1 to 5 and reverses to 2:
Distance = from 1 to 5 = 4cm; from 5 back to 2 = 3 cm; 4 + 3 = 7 cm
Displacement = from 1 to 5 = +4 cm; from 5 back to 2 = -4 cm; 4 - 3 = 1 cm
3. When an object moves from point 1 to 3 and then reverses to 0.
Distance = from 1 to 3 = 2 cm; from 3 back to 0 = 3 cm; 2 + 3 = 5 cm
Displacement = from 1 to 3 = +2 cm; from 3 back to 0 = -3 cm; 2 - 3 = -1 cm
4. When an object moves from point 3 to 5 and then reverses to 1:
Distance = from 3 to 5 = 2 cm; from 5 back to 1 = 4 cm; 2 + 4 = 6 cm
Displacement = from 3 to 5 = +2 cm; from 5 back to 1 = -4 cm; 2 - 4 = -2 cm
5. When an object moves from point 2 to 4 and then reverses to 3.
Distance = from 2 to 4 = 2 cm; from 4 back to 2 = 2 cm; 2 + 2 = 4 cm
Displacement = from 2 to 4 = +2 cm; from 4 back to 2 = -2 cm; 2 - 2 = 0 cm
Question - Complete and balance the following chemical equations:
C8H18 + O2 --->
When you complete and balance the specific equation, give the following information:
State which type of chemical reaction this is.
Explain how you know which type of chemical reaction it is.
List the amount of each element you have when the equation is unbalanced. E.g. there is one mole of calcium on the reactants side.
Give the balanced chemical equation.
List the amount of each element you have when the equation is balanced.
The order of the elements that you balanced the equation with.
Explain how you know which coefficient to use for the specific compound.
Your Answer:
Answer:
2C8H18 + 25O2 -> 16CO2 + 18H2O
(16C, 36H, 50O)
H2O requires 2H per H2O, Meaning that you'd have 9H2O's from 1C8H18, but you still need that O2 for the CO2 and because the reactant side has 8C (within C8H18) You'd have to times the amount of required O2 from CO2 by 8. Even then you still don't have enough for both CO2 and H2O so you'll have to multiply MORE causing a bigger chain reaction resulting in 2C8H18 + 25O2 -> 16CO2 + 18H2O
Pure gold has a density of 19.3 g/cm³. if it is made into a crown. what will be the density of the crown? how can you find out if the crown is indeed made of pure gold and nothing else?
Answer:
19.3g cm^3
If it deviates from the original 19.3g cm^3
In another experiment, the student titrated 50.0 mL of 0.100 M HC,H,O, with
0.100 M NaOH(aq). Calculate the pH of the solution at the equivalence point
Answer:
Eqv Pt pH = 8.73
Explanation:
HOAc + NaOH => NaOAc + H₂O
50ml(0.10M HOAc) + 50ml(0.10M NaOH) => 100ml(0.05M NaOAc) + H₂O
For neutralized system, 100ml of 0.05M NaOAc remains
NaOAc => Na⁺ + OAc⁻
Na⁺ + H₂O => No Rxn
OAc⁻ + H₂O => HOAc + OH⁻
C(i) 0.05M ----- 0M 0M
ΔC -x ----- +x +x
C(f) 0.05-x
≅ 0.05M ----- x x
Kb = Kw/Ka = [HOAc][OH⁻]/[OAc⁻] = 1 X 10⁻¹⁴/1.7 X 10⁻⁵ = (x)(x)/(0.05M)
=> x = [OH⁻] = SqrRt(0.05 x 10⁻¹⁴/1.7 x 10⁻⁵) = 5.42 x 10⁻⁶M
=> pOH = -log[OH⁻] = -log(5.42 x 10⁻⁶) = 5.27
pH + pOH = 14 => pH = 14 - pOH = 14 - 5.27 = 8.73 Eqv Pt pH
3. Are the gates working and can be easily opened in case of
emergency?
Answer:
Yes, I think.
Explanation:
You cannot make an emergency door if you cannot open it easily. So if there is an emergency you need to be able to go threw it fast. So if there is a fire and you needed to just get out of there through the emergency door, just open it and you can get out.
The gates of an emergency exit must be easily opened in case of an emergency to let people out of the building.
It is required that building ought to have an emergency exit. The emergency exit is a door that can easily be opened so that people can leave via that door.
Hence, the gates of an emergency exit must be easily opened in case of an emergency to let people out of the building.
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