Answer:false
Explanation:false
Answer:
true
Explanation:
hoping for the brainliest
QUESTIONS
1. Vinegar contains acetic Acid, CH3COOH. Titration of 5.00g of vinegar with 0.100 M
NaOH requires 33.0cmº to reach the equivalence point.
(a) What is the weight percentage of CH3COOH in vinegar?
(b) If the vinegar has a density of 1.005gcm", what is the molarity of CH3COOH in
vinegar?
Answer:
389929.827
Explanation:
33806.78° C
Answer:
(a) 3.96 (w/w) %
(b) 0.663M
Explanation:
The acetic acid, CH₃COOH, reacts with NaOH as follows:
CH₃COOH + NaOH → CH₃COONa + H₂O
Where 1 mole of acetic acid reacts with 1 mole of NaOH
In the equivalence point of the titration, the moles of acetic acid are equal to moles of NaOH added. To solve this question we need to find the moles of NaOH and thus, the mass of acetic acid
Moles NaOH = Moles acetic acid:
33.0cm³ = 0.033L * (0.100moles / L) = 0.0033 moles
Mass acetic acid -Molar mass: 60g/mol-:
0.0033 moles * (60g / mol) = 0.198g
a) Weight percent is 100 times the ratio of the mass of acetic acid (0.198g) in the mass of vinegar (5.00g):
0.198g / 5.00g * 100 = 3.96 (w/w) %
(b) The volume of the vinegar in the 5.00g is:
5.00g * (1mL / 1.005g) * (1L / 1000mL) = 0.00498L
And the molarity is:
0.0033moles / 0.00498L = 0.663M
Helppppp pleaseeee xx
Answer:
2.5 moles of O₂ = 5 moles of H₂O
Explanation:
The balanced equation for the reaction is given below:
2H₂ + O₂ —> 2H₂O
From the balanced equation above,
1 mole of O₂ reacted to produce 2 moles of H₂O.
Finally, we shall determine the number of mole of H₂O produced by the reaction of 2.5 moles of O₂. This can be obtained as follow:
From the balanced equation above,
1 mole of O₂ reacted to produce 2 moles of H₂O.
Therefore, 2.5 moles of O₂ will react to produce = 2.5 × 2 = 5 moles of H₂O.
Thus,
2.5 moles of O₂ = 5 moles of H₂O
Help me anyone? Thanks!!!!
Baking soda (NaHCO3) and vinegar (HC2H3O2) react to form sodium acetate, water, and carbon dioxide. If 42.00 g of baking soda react, how many moles of carbon dioxide will form? Show your work. (3 points)
NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO
Answer:
0.5 mole of CO₂.
Explanation:
We'll begin by calculating the number of mole in 42 g of baking soda (NaHCO₃). This can be obtained as follow:
Mass of NaHCO₃ = 42 g
Molar mass of NaHCO₃ = 23 + 1 + 12 + (16×3)
= 23 + 1 + 12 + 48
= 84 g/mol
Mole of NaHCO₃ =?
Mole = mass / molar mass
Mole of NaHCO₃ = 42/84
Mole of NaHCO₃ = 0.5 mole
Next, balanced equation for the reaction. This is given below:
NaHCO₃ + HC₂H₃O₂ → NaC₂H₃O₂ + H₂O + CO₂
From the balanced equation above,
1 mole of NaHCO₃ reacted to produce 1 mole of CO₂
Finally, we shall determine the number of mole of CO₂ produced by the reaction of 42 g (i.e 0.5 mole) of NaHCO₃. This can be obtained as follow:
From the balanced equation above,
1 mole of NaHCO₃ reacted to produce 1 mole of CO₂.
Therefore, 0.5 mole of NaHCO₃ will also react to produce 0.5 mole of CO₂.
Thus, 0.5 mole of CO₂ was obtained from the reaction.
Please..................
Sorry so what I think u should do is ask your teach or look up on how to do this problem
Please help due in 5 min.
Answer:
B) Hope this helps! :)
Explanation:
= 25 X 5 = (use the correct number of sig figs)
Answer:
1.25 *10^2
Explanation:
25*5 = 125
= 1.25 *10^2
A solid powder is composed of molecules containing silver (Ag), nitrogen (N), and oxygen (O) atoms. All of the molecules are identical. How is this substance classified? (A) as a heterogeneous mixture (B) as a homogeneous mixture (C) as a compound (D)as an element
GIVING 500 PTS Question 17 (1 point)
Chemical energy can be transformed into mechanical energy in a fan. However, what is the step that is missing from the diagram that shows how this transformation works?
Question 17 options:
magnetic energy
transformational energy
electrical energy
heat energy
Question 18 (1 point)
What is the difference between a generator and a motor?
Question 18 options:
A generator converts mechanical energy into electrical energy and a motor converts electrical energy into mechanical energy.
A generator converts electrical energy into mechanical energy and a motor converts mechanical energy into electrical energy.
A generator converts kinetic energy into mechanical energy and a motor converts mechanical energy into kinetic energy.
A generator converts potential energy into electrical energy and a motor converts electrical energy into potential energy.
Question 19 (1 point)
Which of these is an example of convection?
Question 19 options:
an egg boiling in water
an egg frying in a pan
an egg exposed to a flame
an egg warming under a light
Question 20 (1 point)
A rainstorm occurs on a hillside. Within hours, much of the water flows into a lake at the bottom of the hill. What will most likely happen to the rest of the water?
Question 20 options:
It will change into dew on plants along the hill.
It will become part of the groundwater flow.
It will form a cloud above the hill.
It will change from water into air.
Question 21 (1 point)
What is the Coriolis Effect?
Question 21 options:
the circulation route of trade winds moving from east to west
the way that tropical winds circulate to form hurricanes and large storms
the rapid movement of winds found in the upper atmosphere
he curved path of global winds due to the rotation of Earth
Question 22 (1 point)
Based on the weather map above, which statement is true based on the weather map?
Question 22 options:
A warm front is moving towards South Carolina bring rainy conditions.
A cold front just passed through South Carolina bringing cooler temperatures.
A warm front just passed through South Carolina bringing warmer temperatures.
A stationary front is moving towards South Carolina bringing long periods of rain.
Question 23 (1 point)
Which type of local wind is shown below and what causes this type of wind?
Question 23 options:
At night, cooler air over land replaces rising warmer air over water causing a land breeze.
At night cooler air over water replaces rising warmer air over land causing a land breeze.
During the day, cooler air over land forces warmer air over water to rise causing a sea breeze.
Question 24 (1 point)
An air mass, shown in the image below, that forms over parts of Mexico, Texas, and Arizona will be a _______.
Question 24 options:
continental polar air mass
continental tropical air mass
maritime polar air mass
maritime tropical air mass
Question 25 (1 point)
Which of these plants do not have special tissues to deliver food and water to its cells?
Question 25 options:
Maple
Dogwood
Tomato
Liverwort
Question 26 (1 point)
Where are the female reproductive organs of a flower found?
Question 26 options:
in the stamen
in the roots
in the pistil
in the petals
Question 27 (1 point)
What path do sperm cells take to get to egg cells during fertilization of a flowering plant?
Question 27 options:
Pollen lands on the stigma; pollen grain grows a tube down the style to an ovule; and fertilization occurs.
Pollen lands on an anther; grows a tube to the filament; and fertilization occurs.
Pollen lands on the stigma and fertilization of the stigma occurs.
Pollen lands on a newly formed seed and fertilization occurs.
Question 28 (1 point)
A green plant must be able to perform three different processes in order to survive. What are they?
Question 28 options:
respiration, perspiration, photosynthesis
transpiration, respiration, photosynthesis
chlorophyll, photosynthesis, perspiration
transcription, photosynthesis, chloroplast
Question 29 (1 point)
Which statement is a correct description of the processes of respiration and transpiration in a plant?
Question 29 options:
Transpiration is when the plant loses water through its leaves. Respiration is when the plant breaks down the sugar in its cells to release energy.
Transpiration is when the plant pulls water into its roots. Respiration is when the plant breathes.
Transpiration is when the plant grows over time. Respiration is when the plant breaks down the sugar in its roots.
Transpiration is when the plant produces buds. Respiration is when the plant dies.
Question 30 (1 point)
Which equation correctly describes photosynthesis?
Question 30 options:
water + sugar + oxygen → carbon dioxide + chlorophyll
sunlight + water + carbon dioxide → oxygen + sugar
sunlight + sugar → water + oxygen
carbon dioxide + oxygen → water + sugar + sunlight
Answer:
17. transformational energy
21 POINTS TO WHO EVER CAN ANSWER THIS
Explain why water is considered the "universal solvent".
Answer:
Explanation:
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This allows the water molecule to become attracted to many other different types of molecules.
Polar bears are well adapted to the Arctic environment due to their white
fur coats. Which statement BEST explains why white coat color was
possibly favored by natural selection over other coat colors?
answer: white fur works as a camouflage against the white snow, allowing polar bears an advantage when hunting for food and hiding from predators
How many moles is 130g of CoCl2
Answer:
1 mol
Explanation:
The mass of CoCl2 is 129.83. 130 divided by the mass is 1. This is to convert the mass given to mols that exist in the sample.
Which tile should be used to solve the following problem?
I will give brainliest PLEASE HELP
Answer: B. [tex]\frac{\text {2 mol} H_2O}{\text {2 mol HCl}}[/tex]
Explanation:
The balanced chemical equation is:
[tex]Ca(OH)_2(aq)+2HCl(aq)\rightarrow CaCl_2(aq)+2H_2O(l)[/tex]
is the limiting reagent as it limits the formation of product and is the excess reagent.
According to stoichiometry :
2 moles of produce = 2 moles of
Thus 3.25 moles of [tex]HCl[/tex] will produce=[tex]\frac{2}{2}\times 3.25=3.25moles[/tex] of [tex]H_2O[/tex]
Thus the tile used is [tex]\frac{\text {2 mol } H_2O}{\text {2 mol HCl}}[/tex]
Answer:Below is the answer to all 5 of stoichiometry question
Explanation:
1. B. The student chose the correct tile, but needs to flip the tile to make the units cancel.
2.C. 2.3 moles of oxygen (O2)
3. B. Tile B
4. A. 2.9 moles of aluminum sulfate
5. B. 42.0 grams
which solution would help local farms if the water level in a reservoir used for irrigation became low?
Answer:
Build wind-powered pumps to use groundwater
Explanation:
Answer:
Its B!
Explanation:
Did it on the test!
During the rock cycle, which of the following types of materials forms as a result of weathering and erosion of rock?
2Na + 2H20 – 2NaOH+H2
How many Liters of water are needed if 3.7 moles of Hydrogen are available?
Answer:
0.1332 L
Explanation:
The balanced chemical equation is the following:
2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g)
According to the equation, 2 moles of water (H₂O) produce 1 mol of hydrogen (H₂). So, the stoichiometric ratio is 1 mol H₂/2 mol H₂O. To calculate how many moles of H₂O we need to produce 3.7 moles of H₂, we multiply the moles by the stoichiometric ratio:
3.7 moles H₂ x 2 mol H₂O/1 mol H₂ = 7.4 moles H₂O
Now, we have to convert the moles of water to liters. For this, we have to consider the molecular weight (MW) of water and its density (let's consider 1.0 g/mL).
MW(H₂O) = (2 x 1 g/mol H) + 16 g/mol = 18 g/mol
7.4 moles H₂O x 18 g/mol = 133.2 g
133.2 g/(1.0 g/ml) = 133.2 mL
133.2 ml x 1 L/1000 ml = 0.1332 L
Therefore, approximately 0.13 liters of water are needed.
A strong beam of light is directed toward a tank filled with water. What caused the beam of light to change direction?
When light travels from less dense air to denser glass or water, it slows down. Slowing down of a ray of light changes the direction of the ray of light.
What is Ray of light?Light that travels in a straight line in one direction is called a ray of light. When a group of light emanates from a source, it is called a beam of light. A beam of light is defined as the path of a photon or a group of photons traveling through a space appearing as a column of light.
There are three types of light rays. They are
Incident raysReflected raysRefracted raysExample of a beam is a beam of light with a pass from a laser or laser pointer. A beam of light is made up of particles called photons that carry specific amounts of energy. We cannot measure the length of a beam.
Thus, when light travels from less dense air to denser glass or water, it slows down. Slowing down of a ray of light changes the direction of the ray of light.
Learn more about Ray of light, here:
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giving 300 pts if u get it correct I will put up a separate link so u can get the
Which gases makes up most of Earth’s atmosphere?
Question 1 options:
argon and water vapor
carbon dioxide and oxygen
nitrogen and oxygen
oxygen and argon
Question 2 (1 point)
What is the correct order of earth's atmospheric layers from bottom to top?
Question 2 options:
Mesosphere, Stratosphere, Troposphere, Thermosphere, Exosphere.
Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere
Stratosphere, Troposphere, Mesosphere, Thermosphere, Exosphere.
Thermosphere, Mesosphere, Stratosphere, Troposphere Exosphere.
Question 3 (1 point)
Which characteristics makes the mesosphere different from the other layers of the atmosphere?
Question 3 options:
It is the lowest layer
It is the largest layer
It is the coldest layer
It is the thinnest layer.
Question 4 (1 point)
Based on the diagram above which change can be observed when moving from the troposphere into the stratosphere?
Question 4 options:
Air pressure decreases
Air particles increase
Temperature increases
Question 5 (1 point)
Certain gases in Earth’s atmosphere slow down the movement of energy away from Earth’s surface by absorbing and re-emitting infrared radiation. This helps to keep the surface of Earth at an average temperature of 15°C (59°F). What is this process called?
Question 5 options:
The Coriolis Effect
The Solar Effect
The Greenhouse Effect
The Global Warming Effect
Question 6 (1 point)
How might the increase of volcanic eruptions affect Earth?
Question 6 options:
It might produce more ozone in the atmosphere
It might decrease temperature across Earth
It might increase the carbon dioxide in the atmosphere
It might cause the Earth’s surface to absorb more oxygen.
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Determine which heat transfers below are due to the process of conduction.
I) You walk barefoot on the hot street and it burns your toes.
II) When you get into a car with hot black leather seats in the middle of the summer and your skin starts to get burned when you touch the seats.
III) A flame heats the air inside a hot air balloon and the balloon rises.
IV) A boy sits to the side of a campfire. He is 10 feet away, but still feels warm.
Question 1 options:
I & II
III & IV
I, II, & IV
II, III, IV
Question 2 (1 point)
Saved
The heat transfer depicted in the image is MOST likely
Question 2 options:
circulation
conduction
convection
radiation
he method of heat transfer by which the sun energy reaches the earth is
Question 3 options:
conduction
convection
radiation
solaration
Question 4 (1 point)
Carol owns a two story house with a heating and cooling unit on each floor. In the winter she mostly uses the downstairs unit because the volume of warm air __________ warming the whole house through __________.
Question 4 options:
rises, convection
sinks, conduction
rises, conversion
sinks, radiation
Question 5 (1 point)
The prevailing westerlies are global winds that move from west to east and push most weather in this direction in the United States.
Question 5 options:
True
False
Question 6 (1 point)
Due to the Earth's rotation, global winds follow a curved path known as___.
Question 6 options:
Sea breezes
Wind Direction
Coriolis effect
Wind Chill effect
Which property among the following is best suitable for metalloids
1 Brittle and behaves like a non-metal
2 Have the property of metals and non-metals
3 Malleable and ductile
4 Conducts electricity and behaves like a metal
Answer:
2. Have the property of metals and non-metals
Explanation:
A metalloid is a substance that posseses the characteristics of both metals and non-metals. In other words, it can be said to be an intermediary between metals and nonmetals.
According to this question, a metalloid
Is it possible for a reaction with + ΔG° to still be spontaneous in the forward direction? Explain.
Answer:
See explanation.
Explanation:
Hello!
In this case, according to the thermodynamic definition of the Gibbs free energy:
[tex]\Delta G=\Delta H-T\Delta S[/tex]
In the scenario by which G>0 (nonspontaneous) it would be possible for reaction to have a G<0 (spontaneous) if:
- If H>0 and S>0, then the temperature should be increased until the process was entropy-driven for it to be possible.
- If H> and S<0, then it'd be impossible to have an spontaneous process.
- If H<0 and S>0 then the process was not spontaneous.
- If H<0 and S<0 it is possible if the temperature is not high enough to ensure the process is enthalpy-driven.
Best regards!
g At the start of an experiment, there are 0.200 mol of reactant and 0 mol of product in the reaction vessel. After 25 min, 0.111 mol of reactant (CH3NC) remain. There are ________ mol of product (CH3CN) in the reaction vessel. At the start of an experiment, there are 0.200 of reactant and 0 of product in the reaction vessel. After 25 , 0.111 of reactant remain. There are ________ of product in the reaction vessel. 0.022 0.089 0.311 0.111 0.200
Answer: b. 0.089
Explanation: The Law of Conservation of Mass states that when in a chemical or physical change, the products' mass of a chemical reaction will equal to the mass of the reactants' mass or in other words, mass cannot be created or destroyed.
The same can be said to moles, since, they are also measures of mass.
In the reaction:
[tex]CH_{3}CN_{(g)} \rightarrow CH_{3}NC_{(g)}[/tex]
initially there were 0.200 mol of reactant. After 25 min, there are 0.111 mol left.
This means that 0.089 mol of reactant "transformed" into product.
Therefore, in the reaction vessel, there are 0.089 mol of product.
Hydrogen peroxide with a concentration of 3.0 percent (3.0 g of H2O2 in 100 mL of solution) is sold in drugstores for use as an antiseptic. For a 10.0-mL 3.0 percent H2O2 solution, calculate (a) the oxygen gas produced (in liters) at STP when the compound undergoes complete decomposition and (b) the ratio of the volume of O2 collected to the initial volume of the H2O2 solution.
Answer:
a) 0.099 L
b) 9.9
Explanation:
Now, given the equation for the decomposition of H2O2;
2H2O2(l) ------> 2H2O(l) + O2(g)
Mass of H2O2;
percent w/v concentration = mass/volume * 100
volume = 10.0-mL
percent w/v concentration = 3.0 percent
mass of H2O2 = x
3 = x/ 10 * 100
30 = 100x
x = 30/100
x = 0.3 g of H2O2
Number of moles in 0.3 g of H2O2 = mass/ molar mass
Molar mass of H2O2 = 34.0147 g/mol
Number of moles in 0.3 g of H2O2 = 0.3g/34.0147 g/mol
= 0.0088 moles
From the reaction equation;
2 moles of H2O2 yields 1 mole of oxygen
0.0088 moles of H2O2 = 0.0088 * 1/2 = 0.0044 moles of oxygen
If 1 mole of oxygen occupies 22.4 L
0.0044 moles of oxygen occupies 0.0044 * 22.4/1
= 0.099 L
b) initial volume of the H2O2 solution = 10 * 10-3 L
Hence, ratio of the volume of O2 collected to the initial volume of the H2O2 solution = 0.099 L/10 * 10-3 L = 9.9
Among the theories of man's state of nature,which is/are the most credible/Reasonable?,
trees... they bring life nd without trees, there wouldnt be life
Which one is not an ore of copper
1 Azurite
2 Malachite
3 Haematite
4 Chalcopyrite
Which answer would represent 0.001 moles?
Answer:
Which answer would represent 0.001 moles?
How does air flow when a low-pressure center occurs in the
atmosphere?
Answer:
A
Explanation:
It is so because the low air pressure create vacuum and the air from high pressure area move toward the low air pressure.
Set of degenerate orbital in germanium
Answer:
Which set of orbitals are degenerate?
Degenerate is used in quantum mechanics to mean 'of equal energy. ' It usually refers to electron energy levels or sublevels. For example, orbitals in the 2p sublevel are degenerate - in other words the 2px, 2py, and 2pz orbitals are equal in energy, as shown in the diagram.
Explanation:
Answer:
Electron orbitals having the same energy levels are called degenerate orbitals, For example, orbitals in the 2p sublevel are degenerate - in other words the 2px, 2py, and 2pz orbitals are equal in energy.
Changing the size and shapes of wood would be a chemical change.
O True
O False
Answer:
False.
Explanation:
False because there's no chemicals making change. its a physical change
explain the following terms using examples basic oxide acidic oxide an amphoteric oxide
Answer:
Example of basic Oxide: sodium oxide which reacts with water to produce sodium hydroxide.
Example of Acidic Oxide: SO² in acidic oxide reacts with water and produces an acid.
Example of Amphoteric Oxide: ZnO(s)+2HC(aq)→ ZnCI2(aq)+H2O (I)
Explanation:
Hope this helped Mark BRAINLEST!!!!
PLS HELP, NEED HELLLLLPPPPP!!
How are air temperature and humidity related?
Colder air can hold more water vapor than warmer air.
Warmer air and colder air can hold the same amount of water vapor.
Warmer air can move faster than colder air.
Warmer air can hold more water vapor than colder air.
Answer:
I got you! I think the answer is D. Warmer air can hold more water vapor than colder air.
Explanation:
Although this statement is true, I could be incorrect, but it is unlikely. When warm air recieves more water vapor it expands while cold air becomes packed and unstable.
Hope this helps out, good luck! (¤﹏¤)
~ #LearnWithBrainly ~
Answer:
B!Explanation: