Answers
Answer:
it's not clear. could you send a clearer one?
Related Questions
The amplitude of the wave in image above is represented by the letter?
A
B
C
D
E
F
Answers
Answer:
D
Explanation:
Amplitude is a measure of the distance between the midline and the crest (high point) OR trough (low point) of the wave.
A gas has an initial volume of 10 L and an initial pressure of 0.8 atm. If the pressure decreases to 0.3 atm, what will be the new volume of the gas?
Answers
Answer:
Gas pressure is measured in units such as torr, mmHg, atm, and Pa. ... You can see mass is small, Volume is large. - hense a small ... The pressure increases if volume decreases. ... For each of the following changes of the initial balloon, select ... A sample of nitrogen (N2) has a volume of 60.0 L at a pressure of 725 mmHg.
Explanation:
How does living in a group help wolves?
Answers
Answer: They can hunt together.
Explanation:
Answer:
Wolves are pack animals. They live together in small groups, or families.It's a howl of support, to let the pups know that the pack is there. The other pack members tip their heads back and add their voices to the call.
Explanation:
Match the words and the definitions (15 points for you, please answer quickly <3)
Question 1 options:
Umbra
Eclipse
Penumbra
Corona
1.
The outer, larger, lighter shadow
2.
During a solar eclipse, the moon covers the sun, a small ring of fire is visible around the edge
3.
to vanish
4.
the inner, darkest, cone-shaped shadow is
Answers
Umbra is cone shaped, darkest, inner shadow, eclipse means to vanish, when moon covers sun during solar eclipse, ring of fire visible is called as corona, and larger, lighter shadow of outside is called penumbra. Thus, 1. D, 2. C. 3. B, 4. A are correct.
What is an eclipse?When any astronomical object is temporarily become unclear, because its light is blocked by another object bypassing it, during an astronomical event it is called as eclipse.
Umbra and penumbra re caused by solar eclipse. When light source is completely covered by light source, it is called umbra and when, partial illumination or partial shadow occur, it is called penumbra.
The ring of light visible around edges, during solar eclipse, it is called as corona. Therefore, option 1. D, 2. C. 3. B, 4. A are correct.
Learn more about eclipse, here:
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When you combine vinegar and baking soda, a gas is produced. Explain how a solid and a liquid produced a gas?
Answers
acid reacts to carbon dioxide and sodium acetate a chemical reaction happens and gas bubbles are produced
In a solution made of baking soda and water, the baking soda is the?
Answers
Answer:
solute
Explanation:
water is the solvent and baking soda is the solute and it dissolve in water to make a solution
does anybody know the answer to this?
Answers
Answer:
The answer is Conduction.
Help me to answer the question please
Answers
Answer:
The density is decrease so it B!
someone help ,, I'll give brainliest lolll .
Answers
Answer:
# 4
Explanation:
Toxicity is the degree to which a chemical substance or a particular mixture of substances can damage an organism.
i need this answer today help pls
Answers
Answer:
A. 28 days
Explanation:
Answer:
about 29.53 days
So, 28 days.
Explanation:
If you want the exact, It takes 27 days, 7 hours, and 43 minutes. Yes, i was bored so i calculated it. I'm good with astrology.
Which is true of the enthalpy of a reaction?
Answers
Answer:
C. Its Value Does Not Depend On Which Reactions Are Added
Explanation:
I Just took the test
The true statement of the enthalpy of a reaction is its value does not depend on which reaction is added. The correct option is C.
What is enthalpy?
Enthalpy is a term of thermodynamics. It is the total internal energy and product of the pressure and volume of a system. It can not be calculated, but can be changed.
Thus, the correct option is C, its value does not depend on which reaction is added.
Learn more about enthalpy
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2. How many moles of carbon dioxide are there in 1.34 x1021 molecules of CO,?
Answers
Answer:
0.00223mol
Explanation:
The number of molecules of CO2 (nA) can be used to determine the number of moles it contain by dividing by Avagadros number (6.02 × 10^23 atoms)
That is;
number of moles (n) = nA of CO2 ÷ 6.02 × 10^23
According to this question, there are 1.34 x10^21 molecules of CO2, hence,
n of CO2 = 1.34 x10^21 ÷ 6.02 × 10^23
n = 1.34/6.02 × 10^21-23
n = 0.223 × 10^-2
n = 0.00223mol of CO2
Describe the periodic trend in the ionization energy of elements down a group. Use the periodic table, ionization energy and your knowledge of atomic radius as evidence.
Answers
Answer:
As we move down the group it increases.
Explanation:
This is because the electrons are farther away from the nucleus and hence they are not tightly bounded.
An idea is being proposed. The steps that led to the idea are listed below:
There was a review by the scientific community.
The data collected was observable and measurable.
Opinion and values of all social groups were implemented.
Can this idea be scientific?
A. Yes, because the idea was tested empirically.
B. No, because opinions and social values may lead to bias.
C. Yes, because all steps of the scientific method were followed.
D. No, because the scientific community often favors its peers.
Answers
Answer:
No because opinion and social values may lead to bias
Explanation:
I'm smart >:)
B. No, because opinions and social values may lead to bias.
if it's wrong correct me but I'm pretty sure that's right!
which of the following acts as a catalyst in catalytic converters?
A. Wood
B. Metal
C. Water
D. Gas
Answers
Answer:
B. Metal
Explanation:
The catalyst used in the converter is mostly a precious metal such as platinum, palladium and rhodium. Platinum is used as a reduction catalyst and as an oxidation catalyst. Although platinum is a very active catalyst and widely used, it is very expensive and not suitable for all applications.
Hope it helps plz mark brainlist :)
Why do lawmakers have so much to consider when debating effective energy policies 
Answers
Answer: Different ways of distributing energy have different short-term and long-term environmental consequences.
Explanation:
Due to the big issue of some energy sources being non-renewable and some being renewable, lawmakers have a lot on their plate. Non-renewable sources of energy are harmful to the environment, but they work the best. Renewable sources of energy cost a lot and work, but they require a lot of effort.
Match the items to use the analogy of time to the vocabulary of chemistry.
1 Year
Amount of Matter
Time in general
-
1 Atom/Particle
1 Second
1 Mole
1
Answers
Answer:
1 year- 1 mole
time in general- amount of matter
1 second- 1 atom/ particle
Answer the following question:
How many moles of ammonia are in 375. mL of a 2.25 M aqueous ammonia solution?
Find the numerical answer for this question and make sure to include the following:
What is the chemical formula for ammonia?
What is the formula for molarity?
When you give your numerical answer, what is the correct significant figures and how do you know that is the correct amount?
Answers
poste en français s’il vous plaît
Answer:
Be careful, your chemistry teacher knows that you posted this question and he bookmarked this page!
Explanation:
From an online cheimstry teacher.
. Which of the following factors contributes to the increase in lonization energy from left to right across a period?
an increase in the size of the nucleus
an increase in the shielding effect
fewer electrons in the highest occupied
energy level
an increase in the number of protons
Answers
Answer:
Answer is D
Explanation:
an increase in the number of protons
a student claims the change in average global air temperatures is a result of burning fossil fuels. Explain whether the students claim is plausible based on the data
Answers
Answer: When fossil fuels are burned, they release nitrogen oxides into the air and has a significant impact on global warming. Nitrogen oxide is 300 times more potent than carbon dioxide, and it also depletes the ozone layer.
Explain why the Cell A (nerve cell) and Cell B (red blood cell) cannot switch jobs
Answers
That is copied from “gene expression” article
But all in all, the cells have different structures and different jobs. This means that they are produced for that one job and cannot be made to do another job that they aren’t specifically made for. As well the dna make up will produce these cells specifically and in different cells than the other.
Hopefully this helps some. Have a nice day!
How has the atom changed since Rutherford’s Early Atomic Model?
Answers
Answer:
the atom has changed in many ways, we have found sizes, masses, electrons, neutrons, and more.
Explanation:
The San Andreas fault is at the boundary between two tectonic plates. Earthquakes occur frequently along the fault as the plates slide past one another. The map below shows data on the intensity and location of earthquakes in California and Nevada during a one week period.
Image courtesy USGS
Which conclusion is supported by the data on the map?
A.
The most intense earthquake during the week was in California.
B.
More earthquakes were felt in Nevada than in California.
C.
Earthquakes along the fault were more frequent in the south than in the north.
Answers
Answer:
c.
earthquakes along the fault were more frequent in the south than in the north
A solid has a fixed ___________________ and a fixed ____________
Answers
Answer:
Shape and volume
hope this helps
have a good day :)
Explanation:
Which of the following objects would take you the greatest amount of force to accelerate?
Answers
Complete question is;
Which of the following object would take you the greatest amount of force to accelerate.
A) a soccer ball with a mass of 0.5 kg
B) a refrigerator with a mass of 200 kg, C) a bike with a mass of 25 kg
D) a car with a mass of 5,000 kg,
Answer:
D) a car with a mass of 5,000 kg
Explanation:
Formula for force is;
F = ma
Where;
F is force
m is mass
a is acceleration
Now, Force is directly proportional to the acceleration and mass.
Thus, the higher the mass, the greater the force.
Thus, the object that will require the most force is the one that has the highest mass.
Looking at the options, the one with the highest mass is option D.
A student thermally decomposed a .810 gram sample of impure potassium chlorate. Manganese dioxide was used as a catalyst in the reaction. The student collected 43.60 mL of oxygen gas over water in a eudiometer. Potassium chloride was the other product of the reaction. The temperature and pressure at collection time were 20 Celcius and 762.10 torr respectively. The water level in the eudiometer was 4.22 cm above the outside water level in the beaker. a) write a balanced equation for the reaction. b) what is the corrected pressure of the dry oxygen gas c) what is the volume in mL of the dry oxygen gas at STP conditions d) how many molecules of oxygen gas were collected e) what is the percent purity of the original potassium chlorate sample.
Answers
Answer:
a. 2 KClO3 ------> 2 KCl + 3 O2
b. Vapor pressure of dry oxygen gas = 741.45 torr
c. Volume at STP = 39.63 mL
d. Number of oxygen gas molecules = 1.065 × 10^21 molecules
e. Percent purity of KClO3 = 40.07 %
Explanation:
a) The balanced equation for the reaction is given below :
2 KClO3 ------> 2 KCl + 3 O2
b) Vapor pressure of dry oxygen gas = Total pressure - (water vapor pressure + pressure due difference in water levels)
Vapor pressure of water at 20 °C is 17.535 mm (torr).
Pressure due to difference in water level = 4.22 cm × 10mm/cm / 13.534 (13.534 is the density of mercury) = 3.118 mm (torr).
Vapor pressure of dry oxygen gas = 762.10 torr - 3.118 torr - 17.535 torr
Vapor pressure of dry oxygen gas = 741.45 torr
c) P1 = 741.45 torr
V1 = 43.60 ml
T1 = 20 °C + 273.15 = 293.15 K
P2 = 760 torr
T2 = 273.15 K
V2 = ?
Using the general gas equation = P1V1/T1 = P2V2/T2
V2 = P1V1T2 / P2T1
V2 = (741.45 × 43.60 × 273.15 ) / (760 × 293.15)
V2 = 39.63 ml
Volume at STP = 39.63 mL
d) 39.63 mL = 0.03963 L
Number of moles of oxygen gas in 0.03693 L = 0.03963/22.4 L
Number of molecules of oxygen gas = 0.03963/22.4 L × 6.03 × 10^23
Number of oxygen gas molecules = 1.065 × 10^21 molecules
e) Number of moles of O2 = 39.63/22.4 = 0.001769 mole
From the balanced equation, mole ratio between oxygen gas and potassium chlorate is 3 : 2
Moles KClO3 = 3/2 × 0.001769 moles = 0.00265 moles
Molar mass of KClO3 = 39 + 35.5 + 3 × 16 = 122.5 g
Actual mass of KClO3 decomposed = 122.5 grams × 0.00265 mole = 0.3246 grams
Percent purity = (actual mass KClO3 decomposed / sample mass of impure KClO3) × 100%
Percent purity = (0.3246/0.810) × 100% = 40.1 %
2KClO₃ ------> 2KCl + 3O₂
The corrected pressure of the dry oxygen gas will be calculated with this formula:Vapor pressure of dry oxygen gas = Total pressure - (water vapor pressure + pressure due difference in water levels)
Vapor pressure of water at 20 °C is 17.535mm(torr)
Pressure due to different water levels is
4.22 cm × 10mm/cm / 13.534 (13.534 is the density of mercury) = 3.118 mm (torr).
Vapor pressure of dry oxygen gas = 762.10 torr - 3.118 torr - 17.535 torr
= 741.45 torr
Volume of dry oxygen gasSince we have, P1 = 741.45 torr, V1 = 43.60 mL ,T1 = 20 °C + 273.15 = 293.15 K, P2 = 760 torr , T2 = 273.15 K , V2 = ?
We can then use the general gas equation = P1V1/T1 = P2V2/T2
V2 = P1V1T2 / P2T1
V2 = (741.45 × 43.60 × 273.15 ) / (760 × 293.15)
V2 = 39.63 mL
Volume of dry oxygen gas = 39.63 mL
Number of moles of oxygen gas that was collected will be 0.03693 L = 0.03963/22.4 LNumber of molecules of oxygen gas = 0.03963/22.4 L × 6.03 × 10^23
= 1.065 × 10^21 molecules
The percentage purity will be calculated using the number of moles of O₂ = 39.63/22.4 = 0.001769 moleWe use the balanced equation for the reaction to calculate mole ratio. The
mole ratio between oxygen gas and potassium chlorate is 3 : 2
Mole of KClO₃ = 3/2 × 0.001769 moles = 0.00265 moles
Molar mass of KClO₃ = 39 + 35.5 + 3 × 16 = 122.5 g
Actual mass of KClO₃ decomposed = 122.5 grams × 0.00265 mole = 0.3246 grams
Percentage purity = (actual mass KClO₃ decomposed / sample mass of impure KClO₃) × 100%
= (0.3246/0.810) × 100% = 40.1 %
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Colors of light with shorter wavelengths - A: have less energy than colors with longer wavelengths Strike Reset B: have more energy than colors with longer wavelengths Strike Reset C: have less matter than colors with longer wavelengths Strike Reset D: have more matter than colors with longer wavelengths Strike Reset
Answers
Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
tinyurl.com/wpazsebu
What process created the sand and the soil?
Answers
Answer:
They are produced from rocks (parent material) through the processes of weathering and natural erosion.
Explanation:
Soil minerals form the basis of soil. They are produced from rocks (parent material) through the processes of weathering and natural erosion. Water, wind, temperature change, gravity, chemical interaction, living organisms and pressure differences all help break down parent material.
If you get a root canal or any other potentially painful procedure done at the dentist's office, he or she will probably inject your gums with a local anesthetic to "numb the pain." Neurons that trigger pain are called nociceptors. They trigger pain in order to alert the body to potentially dangerous stimuli. Most local anesthetics hinder the activity of all local neurons, not just nociceptors, so pain is not the only sensation that goes away temporarily. Because all feeling is gone, you can end up drooling on yourself without knowing it.
Considering this information about local anesthestics, which of the following statements best demonstrates that science is an ongoing process that changes in response to new information and discoveries?
A. There are a variety of local anesthetics being used today, including lidocaine, prilocaine, and mepivacaine.
B. Sir Charles Sherrington, who discovered nociceptors, wrote a book about the nervous system that helped show its role in allowing organisms to adapt to their environments.
C. Unlike a local anesthetic, a general anesthetic causes a person to lose consciousness rather than sensation in one area.
D. Scientists have discovered a way to use a compound found in hot peppers, capsaicin, along with an anesthetic in order to block nociceptors only.
Answers
A tower built of Iron is 500 meter tall. What is the change in height (m) if it is exposed to 25 0 Celsius during summer and at 1.00 Celsius during winter. α iron = 1.2 x 10-5/ Celsius
Answers
Answer:
-0.144 m
Explanation:
From the question,
α = Δh/(h₁Δt).................... Equation 1
Where α = coefficient of linear expansivity of iron, Δh = change in height, h₁ = initial height, Δt = change in temperature.
make Δh the subject of the equation
Δh = α(h₁Δt)..................... Equation 2
Given: α = 1.2×10⁻⁵/°C, h₁ = 500 m,
Δt = (t₂-t₁) Where t₂ and t₁ = Final and initial temperature respectively.
Δt = (1-25) = -24 °C
Substitute these values into equation 2
Δh = 1.2×10⁻⁵[500×(-24)]
Δh = 1.2×10⁻⁵(-12000)
Δh = -0.144 m