Answer:
Acid–base indicators are generally weak protolytes that change color in solution according to the pH. The acid–base equilibrium of a weak acid type of indicator (HI) in water can be represented as. [I] The acid, HI, and the conjugate base, I−, have different colors. The equilibrium expression for this process is.
Explanation:
Which one of your body cells carries proteins that determine your blood type?
1) All of your cells
2)Skin cells
3) Red blood cells
4)White blood cells
Calculate the volume of carbon dioxide given off at r.t.p. when 0.9g of glucose ferments.
C6H12O6 (aq) = 2C2H5OH (aq) + 2CO2 (g)
Answer:
2H+(aq) + CaCO3(s) → Ca2+(aq) + H2O(l) +. CO2(g). [ 2]. Award [1] for correct reactants and products. Award [1] if the ... Exercises. 1 Reaction gives off a gas: change in volume could be measured.
How many atoms are in 9.95 moles of iron?
How many molecules are in 0.03 moles of Carbon dioxide?
How many moles are found in 7.20 x 1023 atoms of platinum?
Answer:
59.92 × 10²³ atoms are in 9.95 moles of iron
1.8 ×10²² molecules are in 0.03 moles of Carbon dioxide
1.19 moles are found in 7.20 x 10^23 atoms of platinum
A car travelled at the speed of 10 mls in 35 calculate the distance covered.
Convert 3.00 moles As2S3 to grams.
Answer:
298.99 , = 738.39
Explanation:
hope it help you
to gain the answer
You titrate 25.00 ml of 0.1894 M acetic acid with 0.2006 M NaOH. How many ml of NaOH (to four significant figures) will be required at the equivalence point?
Answer:
23.60 mL NaOH
Explanation:
The reaction is CH3COOH + OH- --> CH3COO+ + H2O
Since the reaction is one-to-one, we can use M1V1 = M2V2.
M1 = 0.1894 M CH3COOH
V1 = 25.00 mL CH3COOH
M2 = 0.2006 M NaOH
V2 = ?
Solve for V2 --> V2 = M1V1/M2
V2 = (0.1894 M)(25.00 mL) / (0.2006 M) = 23.60 mL NaOH
6. How are these two isotopes of carbon different from each other? 12C and 14C
Answer:
Carbon-12 and carbon-14 are two isotopes of the element carbon. The difference between carbon-12 and carbon-14 is the number of neutrons in each of their atoms. ... Atoms of both isotopes of carbon contain 6 protons. Atoms of carbon-12 have 6 neutrons, while atoms of carbon-14 contain 8 neutrons.
Explanation:
haha carbon atoms go brrrrr
help me how to do this
Answer:
sry i don't know that language
Organisms that do NOT consume other organisms for food are
known as -
-
Answer:
autotrophs
Explanation:
The volume of 3.2 moles of nitrogen gas inside a canister is 1.5L. The canister
volume is reduced to 0.3L. How many moles of nitrogen were released?
Answer:
2.56 moles of nitrogen was released.
Explanation:
We'll begin by calculating the final moles of nitrogen in the canister. This can be obtained as follow:
Initial mole (n₁) = 3.2 moles
Initial volume (V₁) = 1.5 L
Final volume (V₂) = 0.3 L
Final mole (n₂) =?
V₁/n₁ = V₂/n₂
1.5 / 3.2 = 0.3 / n₂
Cross multiply
1.5 × n₂ = 3.2 × 0.3
1.5 × n₂ = 0.96
Divide both side by 1.5
n₂ = 0.96 / 1.5
n₂ = 0.64 mole
Finally, we shall determine the number of mole of nitrogen that was released. This can be obtained as follow:
Initial mole (n₁) = 3.2 moles
Final mole (n₂) = 0.64 mole
Amount released =?
Amount released = n₁ – n₂
Amount released = 3.2 – 0.64
Amount released = 2.56 moles
Thus, 2.56 moles of nitrogen were released.
9. A student needs to prepare 100 mL of a 0.50 M ammonium chloride, NH4Cl,
solution. How much solute does he need?
Answer:
2.67g of NH4Cl are required
Explanation:
Molarity is an unit of concentration in chemistry defined as the moles of solute (In this case, NH4Cl), per liter of solution.
To prepare 100mL of a 0.50M are required:
100mL = 0.100L * (0.50 moles / L) = 0.0500 moles NH4Cl
As molar mass of NH4Cl is 53.491g/mol:
0.0500 moles * (53.491g / mol) =
2.67g of NH4Cl are requiredwhich item is dull.
A. a glass cup
B. a cloth sock
C. a ceramic coffee mug
D. a metal pot
What occurs when solid A, at 50.0°C, is place in liquid B, at 80.0°C?
A Heat energy flows from A to B as the average kinetic energy of the particles in A decreases
B Heat energy flows from A to B as the average kinetic energy of the particles in A increases
CHeat energy flows from B to A as the average kinetic energy of the particles in B decreases
D Heat energy flows from B to A as the average kinetic energy of the particles in B increases
Illustrating Mechanical Waves
TASK: Create a collage to describe and illustrate how a medium may move and transfer energy in a transverse and compressional/longitudinal wave.
Mechanical waves are waves that transfer energy through a medium (matter). The medium can be a solid, liquid or a gas. A medium in a mechanical wave can move transversely , in a surface wave or Longitudinally. Illustrate the medium movement in a transverse wave and in a compression wave. Below is a checklist/guide for how you will be evaluated for this task.
Illustrate a transverse wave that progressively changes with at least 3 distinguishable
properties: Maximum Points: 60
Labels the crest and the trough.
Labels a point at which the energy of the wave is high.
Labels a point at which the energy of the wave is low.
Label the amplitude, wavelength and identify the frequency of the wave
Draw an arrow to indicate the direction that the medium moves.
Draw an arrow to indicate the direction that the wave moves.
Provides description of your wave in terms of wavelength (long, short), frequency (high, low and the amount in Hertz-Hz) amplitude (high, low)
Identify a measured wavelength and amplitude.
Lastly, have a title and the definition of a transverse wave.
YOU MUST HAVE THE FOLLOWING: 5 points each
Uses color.
Uses a color coded system.
Provides a legend/key for the illustration.
Illustration of a Longitudinal/Compressional Wave that changes in energy
Maximum Points 40
Labels the compressions.
Labels the rarefactions.
Identify the point at which the energy of the wave is high.
Identify the point at which the energy of the wave is low.
Draws an arrow to indicate the direction that the medium moves.
Draws an arrow to indicate the direction that the wave moves.
Lastly, have a title and the definition of a compressional/longitudinal wave.
YOU MUST HAVE THE FOLLOWING: 5 points each
Uses color.
Uses a color coded system.
Provides a legend/key for the illustration.
Transverse wave:
⇨- the way the wave is moving
⟶- Medium - the material it is traveling through
冖- Wavelength - the distance from crest to crest
C - Crest - the highest point on a wave
T - trough - the lowest part on a wave
↕️ - Amplitude - the distance from rest to crest
ྊ - (tinfoil)Wave
Description:
In the beginning of the wave the wavelength is short and the frequency is high so is the energy.and the amplitude is low *i believe* And after the mark of T shown on the image the wavelength is long and the frequency is low and so is the energy and the amplitude is high *i believe*.Amplitude and wavelength are both measures of distance.
Longitudinal/Compressional Wave:
KEYS:
⟶-medium - the material it is traveling through
⇨-way the wave is moving
冖-wavelength - the distance from crest to crest
R -Rarefaction - the opposite of compression
C-Compression - particles are closest together
A piece of charcoal is found to contain
30% of the carbon 14 that it originally
had. When did the tree die from which the
charcoal came? use 5600 years as the
half-life of carbon 14.
A) 9709.46
B) 9708.33
C) 9708.34
D) 9709.45
Answer: The tree died 9709.46 years before.
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = 100
a - x = amount left after decay process = [tex]\frac{30}{100}\times 100=30[/tex]
a) to find rate constant
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{5600years}=1.24\times 10^{-4}years^{-1}[/tex]
b) to know the age
[tex]t=\frac{2.303}{1.24\times 10^{-4}}\log\frac{100}{30}[/tex]
[tex]t=9709.46years[/tex]
The tree died 9709.46 years before.
What is an important effect of gravity?
A. It causes radioactive particles to split off from the nucleus.
B. It is responsible for charge attraction.
C. It keeps the nucleus of the atom together.
D. It maintains the distances between planets.
SUBMIT
Answer:
d. It maintains the distances between planets.
Explanation:
can I write "+-" as the charge for a neutron in an atom or would it be considered wrong?
Answer:
yesssssssssssssss
Explanation:
On a hot day, a student places a glass of cold lemonade on a table outdoors. After a few minutes, water droplets have formed on the outside of the glass.
Is energy absorbed or released by the cold lemonade? Explain your answer.
Compare average kinetic energy for the air molecules and lemonade molecules when the student first places the lemonade outdoors. Explain your answer.
Explain how and why the water droplets form on the outside of the glass.
Answer:
ye but sdfajkd tryng to play me
Explanation:
Answer:
Vapor is released out of the lemonade because when you place it in a hot it will increase.
Explanation:
No link or Files plz i need help with this one i been stuck on it for a long time
Answer:
The particles in a solid are tightly packed and locked in place. Although we cannot see it or feel it, the particles are moving or vibrating in place.
Answer:
molecules in a solid are tightly packed together and vibrate about their fixed positions.
Explanation:
there is very little movement between molecules in a solid since there is not much space between the molecules, hence the slight vibrations.
i hope this helps! :D
Which substance is a binary acid?
1,)hydrochloric acid
2.)phosphoric acid
3.)nitrous acid
4.)sulfuric acid
Answer:
1. Hydrochloric acid
Explanation:
Hydrochloric acid
Answer:
4)
Explanation:
formula:H2 SO4
there are 2 H+ ions in 1 molecule of sulfuric acid
thus it has a basicity of 2
Find the density of an object that has a mass of 12.69 grams and a volume of 3.5cm3
Answer:
3.62 g/cm³
Explanation:
density = mass ÷ volume
Therefore, do 12.69 divided by 3.5
What are cells made of?
Answer: All cells are made from the same major classes of organic molecules: nucleic acids, proteins, carbohydrates, and lipids.
Explanation: please mark as brainliest
. 2. Which has more atoms: 2.5 mol of calcium carbonate,
CaCO3, or 3.5 mol of calcium hydroxide, Ca(OH)2
Answer:
Calcium hydroxide has more atoms.
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.
Then you can apply the following rules of three:
If 1 mole of calcium carbonate represents 6.023*10²³ atoms, 2.5 mole of calcium carbonate represents how many atoms?[tex]amount of moles of calcium carbonate=\frac{2.5 moles*6.023*10^{23} atoms}{1 mole}[/tex]
amount of moles of calcium carbonate= 1.50575*10²⁴
If 1 mol of calcium hydroxide represents 6.023*10²³ atoms, 3.5 mol of calcium hydroxide represent how many atoms?[tex]amount of moles of calcium hydroxide=\frac{3.5 moles*6.023*10^{23} atoms}{1 mole}[/tex]
amount of moles of calcium hydroxide= 2.10805*10²⁴
2.10805*10²⁴ is greater is 1.50575*10²⁴, so calcium hydroxide has more atoms.
0.75 moles of an unknown acid are dissolved in water. If 0.42 moles of H3O+ form, what was the percent dissociation of the unknown acid?
Answer:
56 %
Explanation:
The percent dissociation of a weak acid can be defined as:
Moles of weak acid that produced H₃O⁺ species / Total number of weak acid moles * 100%
We are given all the required data to calculate the percent dissociation:
0.42 mol / 0.75 mol * 100 % = 56 %
The percent dissociation is 56%.
Mosquitoes breed in areas where there is often standing, still, svampy, water. Mosquitoes can cause malaria and other harmful diseases to humans and animals. Without causing damage to an existing ecosystem, what could you do to help control the current mosquitoes and their larvae? (what would eat them ?)
Answer:
Many natural scents that are appealing to humans actually repel mosquitoes, including lavender, peppermint, basil, and eucalyptus. Many of these scents can be worn as an essential oil on your skin to help keep these pesky pests from biting you.
How many grams are there in 51.9 moles of F2 gas? (4 pts)
PLS HELP ASAP ILY
Answer:
1972 grams of F₂
Explanation:
Multiply the molar mass of F₂ by the number of moles
The subject is science I need you’re help plsssss
Answer:
sweat is the water that comes out of your body when you workout
22. Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in an 42.0-g sample after 90 hours?
Answer:
The answer would be 0.65625
What is a bengal cat mixed with to make it a hybrid
Answer:
A Bagel Cat
Explanation:
Answer:
the spotted Egyptian Mau, with the Asian leopard cat.
an elephant puts a force of 30,000 N on its four feet,
which have a total area of 7,500 cm². What is the pressure
it puts on the ground
Explanation:
pressure is Force/area
30000/0.75
