so 68 + 83 is 182 easy done
1. explain how u would test the presence of oxygen and hydrogen gases
2. explain how u can get the most accurate reading in titration
3. why is scientific method important in chemistry? state your opinion
4. you are given a bucket of ice cubes, a little sugar, a measuring cylinder and a stopwatch.Plan a experiment to determine whetther sugar increases the melting rate of ice
In the case of pathogen infections, chronic inflammation indicates
that the host does not have functional defense mechanisms.
that the host is fighting a lengthy battle against the pathogen.
that the pathogen has become an established part of the host's resident microbiota.
that the pathogen infection has been effectively overcome by the host.
Answer:
The answer is that the pathogen has become an established part of the host's resident microbiota. :)
Have an amazing day!!
Please rate and mark brainliest!!
What is the best reason that fire is not considered a living organism?.
Answer:
all living organisms have cells fire does not
HELP ANYONE PLEASE ASAP TYY!!!
As the pressure on a given sample of a gas increases at constant temperature, the mass of the sample.
Complete and balance the following equation K+H2O
Explanation:
hello
2K + 2H2O ==》2KOH + H2
In one to two sentences, describe characteristics of a high-pressure system.
i give brainlist
pls answer in your own words
Answer:
A high pressure area is an area where the air sinks. As it does, it warms up by the adiabatic effect of a greater pressure and that causes the clouds to evaporate, giving place to a clear sky
Explanation:
A high-stress area, high, or anticyclone, is a location in which the atmospheric stress on the surface of the planet is more than its surrounding environment.
What are the traits of the high-pressure system?In a high-Pressure system, it has better pressure in its center than in the regions around it. Winds blow away from excessive pressure.
Swirling withinside the contrary route from a low-stress system, the winds of an excessive pressure system rotates clockwise north of the equator and counterclockwise south of the equator.
Hence, these are the characteristics of high-pressure system.
Learn more about high-pressure system here:
https://brainly.com/question/22343575
#SPJ2
1. -A mixture of aluminum metal and chlorine gas reacts to form aluminum chloride (AlCl3): 2Al(s) +
3Cl2(g) → 2AlCl3(s). How many moles of aluminum chloride will form when 5 moles of chlorine gas react
with excess aluminum metal?
Answer:
3.33 moles
Explanation:
We know that our limiting reactant is chlorine so we just have to figure out how much of the product aluminum chloride (AlCl3) would be formed from 5 moles of chlorine gas. As we can see in the balanced equation, the mole ratio of chlorine gas (Cl2) to aluminum chloride is 3:2 based on the coefficients of the species. All you have to do from here is divide the amount of moles of chlorine gas by its own coefficient and then multiply the number you receive by the coefficient of AlCl3.
5/3=1.66
1.66*2=3.33
The buffer that is adjusted to control acid-base balance is ________. plasma protein hemoglobin phosphate buffer bicarbonate: carbonic acid buffer
The buffer that is adjusted to control acid-base balance is referred to as a bicarbonate buffer.
What is a Buffer?This consists of a weak acid and its conjugate base, or vice versa and resist changes in the pH of the solution.
The bicarbonate buffer is involved in acid-base homeostasis by removing CO2 and hydrogen ions, respectively, from the body.
Read more about Buffer here https://brainly.com/question/22390063
9. A 2.00 L flask is filled with propane gas (CH) at a pressure of 1.00 atm and a
temperature of -15.0°C. What is the mass of the propane in the flask?
the correct amswer is 4.17g
Which is the best definition of rate-determining step?
a) an elementary step that often occurs in the reaction mechanism
b) the elementary step that limits how fast the overall reaction proceeds
c) an elementary step that is used to derive a rate law
d) the unimolecular step in a reaction mechanism
Answer:
The correct answer is B. Give me Brainliest
The pressure of a gas sample at 60.0 °C is decreased from 3.40 atm to 2.60 atm by cooling at a constant volume. What is the temperature (in °C) of the gas at 2.60 atm?
When the pressure of a gas is decreased from 3.40 atm to 2.60 atm, the temperature of the gas will decrease from 60.0 degree celsius to 45.88 degree celsius.
What is Gay-Lussac law?Gay -Lussac law states that the pressure and temperature is in direct proportions. Thus, pressure increases with an increase in temperature. The relation can be mathematically expressed as follows:
P/T = a constant. Hence,
P1/T1 = P2/T2
The initial pressure of the sample is given, 3.46 atm and the initial temperature is 60 °C. The final temperature of the gas when gas the expand to the lower pressure of 2.60 atm is calculated as follows:
[tex]T_{2} = \frac{P_{2}T_{1}}{P_{1}}[/tex]
= (60 °C× 2.60 atm) / 3.40 atm
= 45.88 °C.
Hence, the final temperature of the gas which is expanded from the pressure of 3.40 atm to 2.60 atm with an initial temperature of 60 °C is 45.88 °C.
To find more about Gay-Lussac law, refer the link below:
https://brainly.com/question/2683502
#SPJ2
_______ are similar to molecular formulas but show how atoms are bonded together.
Answer
The structural formula are similar to molecular formulas but show how atoms are bonded together.
Explanation:
The structural formula for a compound gives the same information as its molecular formula (the types and numbers of atoms in the molecule) but also shows how the atoms are connected in the molecule.
please help
Which of the following diagrams shows how osmosis would affect a plant cell when placed in a solution with a lower solute concentration than its own?
A.
Diagram Y
B.
Osmosis is not dependent on solute concentration.
C.
Diagram Z
D.
Diagram X
Answer:
Diagram Z
Explanation:
A cell placed into a hypotonic solution will swell and expand until it eventually burst through a process known as cytolysis.
Answer:
Diagram Y
Explanation:
Osmosis is the passive movement of water molecules across (into or out of) a cell membrane. "Passive" means that the process occurs automatically without the need for chemical energy.
In the diagrams above, a plant cell is shown as it would appear in a solution with a solute concentration more than its own (X), a solution with a solute concentration equal to its own (Y), and a solution with a solute concentration less than it own (Z). The movement of water is toward the area of more solute concentration (and therefore less water concentration).
The answer, then, is Diagram Y.
(Trust me, I just did it)
Calculate the volume of a solution of 3.6 M NH4Cl needed to prepare 350.0 mL of 1.24M NH4CH
Select one:
a. 120 mL
b. 12.0 mL
c. 967 ml
d. 96.7 ml
How many grams of ammonium chloride are in the solution you created in the above problem Select one:
a. 23.28
b. 0.438
c 53.58
d. 232 23
Answer:
select one :c
select two:d
What is the pressure in a 8.00 L tank with 50.5 grams of chlorine gas at 365 K?
The pressure in a 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.67atm.
How to calculate pressure?The pressure of a given mass of gas can be calculated using the following formula:
PV = nRT
Where;
P = pressureV = volumeT = temperaturen = no of molesR = gas law constantThe number of moles in 50.5g of Chlorine gas is as follows:
moles = 50.5/70.91
moles = 0.71mol
P × 8 = 0.71 × 0.0821 × 365
8P = 21..34
P = 21.34/8
P = 2.67atm
Therefore, the pressure in a 8.00 L tank with 50.5 grams of chlorine gas at 365 K is 2.67atm.
Learn more about pressure at: https://brainly.com/question/12971272
PLEASE HELP ASAP
What does it mean that the collisions between gas particles are elastic?
Answer:
There is no net loss of energy from the collisions.
Explanation:
Gas particles are constantly colliding with each other and the walls of their container. These collisions are elastic; that is, there is no net loss of energy from the collisions. Gas particles are small and the total volume occupied by gas molecules is negligible relative to the total volume of their container.
1. A sulfur atom has 16 protons, 18 neutrons, and 16
electrons. A sulfide ion has a 2– charge. Which of
the following is the correct number of particles that
make up a sulfide ion?
a. 18 protons, 18 neutrons, and 16 elections
b. 16 protons, 18 neutrons, and 18 electrons
c. 18 protons, 16 neutrons, and 16 electronis
d. 14 protons, 18 neutrons, and 16 electrons
e. 15 protons, 17 neutrons, and 17 electronis
Answer:
b. 16 protons, 18 neutrons, and 18 electrons
Explanation:
Things to be remembered
Negative charge on any ionic species indicates gained the electrons
Positive charge on any ionic species indicates lost the electrons
A sulfur atom has 16 protons, 18 neutrons, and 16 electrons, A sulfide ion has a 2– charge which indicates that sulphur has gained two electron from any other atom, ion or species!
Thanks for joining brainly community!
What type of probes physically land on the surface of a planet or moon?
Answer:
Here are three types of probes that land on space physically. Interplantery, orbiters, and landers.
Explanation:
These are the ones that collect data and other stuff from space.
giving brainliest please help!
What is Solution Concentration with examples
[tex]\qquad \qquad \huge \pink {\sf{☁Answer☁}} \\ \\ [/tex]
Solution Concentration or the concentration of the solution.The amount of solute dissolved in a particular amount of the solvent is a crucial parameter and is called Solution ConcentrationEXAMPLE →if you add one teaspoon to two cups of water, the concentration could be reported as 1 t salt per 2 c water.[tex]\purple{\rule{15mm}{2.9pt}} \red{\rule18mm{2.5pt}} \orange{ \rule18mm{2.5pt}}[/tex]
[tex]\sf{\:мѕнαcкεя\: ♪...}[/tex]
What is the molarity of NaCl when 5.0 moles of NaCl is dissolved in 2.0 L solution
Answer:
Molarity having mol/L that is moles of solute in per liters of solution.
mark as Brainliest please
Explanation:
substituted and expected value in the above education molarity equal to 0.5 mole by 2.0
How many grams are in 2.3 moles of N?
Answer:
Therefore, 40.4 grams are contained in 2 moles of Neon.
A sample of no2 occupies 16,500 ml at stp. How many no2 molecules are in the sample?.
According to Avogadro's law equal volume of all gases at the same temperature and pressure contain equal number of molecules. At STP one mole of any gas behaving ideally occupies a volume of 22.414 L.
What is molar volume?The volume occupied by one mole of a substance at a given temperature and pressure is defined as the molar volume at that temperature and pressure. The value of molar volume of an ideal gas at STP is important in stoichiometric calculations.
At STP, the number of molecules of a gas is given as:
Number of molecules of a gas (N) = V₀ in L / 22.414 × 6.022 × 10²³
Here V₀ in L = 16500 = 16.5 L
N = 16.5 / 22.414 × 6.022 × 10²³
N = 4.433 × 10²³
Thus the number of molecules present is 4.432 × 10²³.
To know more about number of molecules, visit;
https://brainly.com/question/19109598
#SPJ2
Geysers are formed when groundwater is heated by nearby magma. Please select the best answer from the choices provided T F
If a gas has a volume of 1.25 l at a temperature of 300 k, what will the volume change to if the container is cooled to 200k
The volume of the gas when the container is cooled from a temperature of 300 K to 200 K is 0.83 L
Charles' law
Charles' law states as follow:
V₁ / T₁ = V₂ / T₂
Where
V₁ is the initial volume T₁ is the initial temperature V₂ is the new volume T₂ is the new temperature How to determine the new volumeFrom the question given above, the following data were obtained
Initial volume (V₁) = 1.25 LInitial temperature (T₁) = 300 KNew temperature (T₂) = 200 KNew Volume (V₂) =?V₁ / T₁ = V₂ / T₂
1.25 / 300 = V₂ / 200
Cross multiply
300 × V₂ = 1.25 × 200
Divide both side by 300
V₂ = (1.25 × 200) / 300
V₂ = 0.83 L
Learn more about gas laws:
https://brainly.com/question/6844441
1. Define the unit 'mole'
Answer:
Below
Explanation:
The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample
PLEASEE HELPPP
what is the ph of 1.0 times 10^-2 M HBr
Answer:
The pH of a solution with the [H + ] = 1 × 10 -2 M is 2 and the pH of a solution with the [H + ] = 1 × 10 -10 M is 10. ( I think this is correct ).
Explanation:
Which substances are contained in saliva and tears to break down pathogens?
enzymes
acids
oils
sweat
Answer:
A. Enzymes
Explanation:
Enzymes are in our saliva and tears. They help break down pathogens and the cell wall of bacteria.
I hope it helps! Have a great day!
Muffin~
Answer:
A. Enzymes.
Explanation:
Enzymes break down things and they are in both our saliva and tears.
I hope it helps! Have a great day!
.-.
how do you find the oxidation numbers for H3PO4
