Answer:
The more structures that are similar, the more closely related organisms are in their evolutionary past. For example, a human, a dog, a fruit bat, and a dolphin all have the same pattern of bone structure in the upper extremity—one bone connected to two bones, connected to many bones, connected to finger-like bones.
Answer:
Explanation:
they are all made of cells
Inferring Relationships Most earthquakes take
place near tectonic plate boundaries. Based on the
hazard levels, where do you think a boundary between
two tectonic plates is bcated in the United States?
Answer:
california
Explanation:
How many chlorine atoms are there in 100 g of carbon tetrachloride
Answer:
1.566x10²⁴ atoms of Cl
Explanation:
In Carbon tetrachloride, CCl₄, you have 4 moles of Cl per mole of CCl₄. To solve this question we must find the moles of CCl₄ in order to find the moles of Cl. Using Avogadro's number we can solve the chlorine atoms:
Moles CCl₄: 153.82g/mol
100g * (1mol / 153.82g) = 0.65 moles CCl₄
Moles Cl:
0.65 moles CCl₄ * (4 moles Cl / 1mol CCl₄) = 2.6 moles Cl
Atoms Cl:
2.6 moles Cl * (6.022x10²³ atoms / mol) =
1.566x10²⁴ atoms of ClHow many moles of nitrogen gas are present in a 28.9 dm3 temperature of 55.0 °C and a pressure of 144 kPa?
Given :
Temperature, T = 55° C = ( 55 + 273 ) K = 328 K .
Volume of container, V = 28.9 dm³ = 0.0289 m³ .
Pressure, P = 144 kPa = 144000 Pa .
To Find :
Number of moles of nitrogen gas.
Solution :
We know, by ideal gas equation :
PV = nRT ( R ( universal gas constant ) = 8.31 J K⁻¹ mol⁻¹ .
[tex]n = \dfrac{PV}{RT}\\\\n = \dfrac{144000\times 0.0289}{8.31 \times 328} \ moles\\\\n = \dfrac{4161.6}{2725.68}\\\\n = 1.53 \ moles[/tex]
Therefore, number of moles of nitrogen gas is 1.53 moles.
How many moles of KClO3 are needed to produce 480 grams of O2?
Answer:
2:3
You'd need 33.3 moles of potassium chlorate, KClO3 , to produce that much oxygen. Notice that you have a 2:3. mole ratio between potassium chlorate and oxygen gas, which means that, regardless of how many moles of the former react, you'll always produce 3/2 times more moles of the latter.
Explanation:
Balance the following chemical equation:
C2H60+02 → CO2 + H20
Answer:
Explain: In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal.
What can lead to being curious and also lead to fascinating scientific investigations? a. Questions b. Answers c. Qualitative Measurements d. Quantitative Measurements
Answer:
Questions
Explanation:
The word "science" was obtained from the Latin word "Scire" which means "to know". Hence science is a systematic investigation into the nature of the universe.
Scientific investigations begin with asking questions about the universe. It is this curiosity to know about occurrences in the universe as well as how to solve problems in the universe that leads to fascinating scientific investigations and discoveries.
7.(05.02 MC)
The speed of light in four different materials is shown below:
Material Speed of light in thousand miles per second
A
140
B
78
С
186
D
12
Which material is the most dense? (4 points)
Material A
Material B
Material C
Material D
Answer:
C
Explanation:
thats the answer!! HEHEHHEHHHHSJSKSSSSJS
Answer: B or A
Explanation: Everyone is saying C and i just took the test and it is not C
Microorganisms have a major role in maintaining soil biodiversity. They recycle nutrients in ecosystems and decompose organic matter in soil. Organic matter contains dead and living plant and animal materials. Microorganisms convert these materials into simpler compounds that maintain soil quality and help with plant growth.
Which solution could best help to restore or increase microorganisms and soil biodiversity?
A.
adding manure or compost to the soil
B.
spraying chemical weed-killers and fertilizers on the soil
C.
removing all ground-covering plants from the soil
D.
adding sewage containing synthetic materials to the soil
Answer:
A i think
Explanation:
The solution that could best help to restore or increase microorganisms and soil biodiversity is adding manure or compost to the soil.
What are microorganisms?A microorganism, or microbe, is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.
“Microorganisms are minute organisms that are invisible to the normal eye.” Microorganisms are so small that they can only be seen under a microscope. These include a huge range of organisms such as bacteria, viruses, fungi, algae, protozoa, etc.
Given options are-
A. adding manure or compost to the soil
B. spraying chemical weed-killers and fertilizers on the soil
C. removing all ground-covering plants from the soil
D. adding sewage containing synthetic materials to the soil
Therefore, The solution that could best help to restore or increase microorganisms and soil biodiversity is adding manure or compost to the soil.
Learn more about microorganisms here:
https://brainly.com/question/6699104
#SPJ3
What is the answer to this?
the answer is A.
the scientist used mud and vinegar to make a model of the volcano.
what is the electronic structure of an atom with a proton number 11 and mass number 23
Answer:
1s^2 2s^2 2p^6 3s^1
Explanation:
electron configuration of an element gives description of the distribution of electron in it's orbital of the atom, the superscript symbolize number of electron been hold by them.
The element here is sodium, which is a alkali metal
mass number =23
Number of proton= 11
electron must be seen in thelowest-energy subshell that is available in the the 3s orbital,
Hence, the electronic configuration is
1s^2 2s^2 2p^6 3s^1
Your friend says, “chemical changes are caused by an input in energy. In physical changes, there is no transfer of energy” is your friend correct? Why or why not?
Answer: Your friend is incorrect.
Explanation: If we have an object or something that isn’t moving, (let’s say a notebook on a desk). If there is change, and the notebook moves, there is acceleration. Force = Mass times acceleration, f = m*a. There has to be a force, first of all. If you touched the notebook and moved it, some of your energy is transferred and now the notebook has kinetic energy. If our system is you and the notebook, the total energy doesn’t change. the energy is transferred, but doesn’t change. Your friend is not correct. Please give brainliest hope this helped!
Please help!
Explain how the Gray Wolf is a keystone species in the Yellowstone
National Park ecosystem.
Wolves are a censerious(critical) keystone species in a healthy ecosystem. By regulating prey populations, wolves authorize(enable) many other species of plants and animals to flourish. Without predators, such as wolves, the system fails to support a natural level of biodiversity.
An object has balanced forces acting on it. Which of the following describes the result these balanced forces have on the object? A. It remains at rest or speeds up in the same direction. B. It speeds up in the same direction or moves at constant speed. C. It speeds up in the same direction or slows down. D. It remains at rest or moves at constant speed in the same direction.
Answer:
C.It remains at rest or moves at constant speed in the same direction.
Explanation:
First, remember the Newton's 1st law of motion which states that the object at rest will remain at rest and that in motion will stay in motion with the same speed and same direction unless acted by unbalance forces.
Balanced forces on an object occur when two forces at act on an object are equal in size and act in opposite direction. In this case, a stationary object will stay at rest while an object moving will continue to move at the same speed and same direction.
An object acted by balanced forces is said to be at equilibrium, thus the state of motion will be maintained.The object will not accelerate. A good example of an object acted by balanced forces is an object at rest or in constant motion such as a car that stopped at red-light signal or a car travelling at a constant speed.
Lab: Limiting Reactant and Percent Yield
Student Guide
Pre-Lab Information
Purpose Explore the yield of a chemical reaction by identifying the limiting reactant, comparing the
theoretical and actual yields, and explaining the sources of error.
Time Approximately 45 minutes
Question While observing a chemical reaction, how can you tell which reactant is limiting?
Reaction The reaction of copper(II) chloride and aluminum is shown in this balanced equation:
3CuCl2 + 2Al 2AlCl3 + 3Cu
Hypothesis If a substance is the limiting reactant, then it will be fully consumed by the time the
reaction completes because it is the reactant that reacts completely and the reaction
cannot proceed further.
Summary You will react copper(II) chloride with different quantities of aluminum in two trials. You
will also calculate percent yield for Trial 2.
Answer:
pre lab information would be the thing you to ressearch the lab to get the information
Limiting Reactant and Percent Yield Lab Report attached
Describe how ultrasonic waves help ships navigate and how ultrasonic waves can be used for medical purposes
A material in which electrons are able to move easily or freely is a(n)
A none of these
В electric field
C insulator
D conductor
Answer:b
Explanation:
Name the gases that mostly compose the atmosphere.
O Argon and Carbon Dioxide
O Oxygen and Carbon Dioxide
Oxygen and Nitrogen
Carbon Dioxide and Nitrogen
Explanation:
Oxygen and Nitrogen. is the correct pair.
An organism whose cell contains a nucleus.
Answer:
Eukaryotes
Explanation:
The Moon only emits light at night.
True
False - does not emit light at all
Answer:
It's trueeeeeee:))))))
Answer:
TRUE
Explanation:
How are bird bones adapted for flight?
1. They are thin.
2. They are hollow.
3. They are strong.
4. Birds do not have many bones.
Answer:
2. They are hollow.
Explanation:
goo gle says
At what temperature would the volume of a gas be 0.550 L if it had a volume of 0.432 L at –20.0°C? Be careful! This is not in the correct units for temperature.
Answer:
49.2°C is the temperature
Explanation:
Based on Charles's law, the absolute temperature of a gas is directly proportional to the volume under constant pressure. The equation is:
V1 / T1 = V2 / T2
Where V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas.
Computing the values of the problem:
V1 = 0.432L
T1 = -20.0°C + 273.15K = 253.15K
V2 = 0.550L
T2 = ?
0.432L / 253.15K = 0.550L / T2
322.3K = T2
322.3K - 273.15 =
49.2°C is the temperatureCertain minerals exclude lead but not uranium from their crystal structure, so when the minerals form they have no lead, only uranium. As time goes on, the uranium decays to lead, so measuring the ratio of lead atoms to uranium atoms allows investigators to determine the ages of the minerals. If a sample of a mineral contains 3 atoms of 207Pb207Pb for every 1 atom of 235U235U, how many years ago was it formed
Answer:
The answer is "[tex]1.4 \ \bold{ billion-years}[/tex]".
Explanation:
Using formula:
[tex]\to N_{Now} = N_{orige}e^{\lambda t} \\\\[/tex]
[tex]\to[/tex] 1 U atom produces 1 Pb atom after decay.
[tex]\to[/tex] U's original numbers are now the sum of U counts and Pb counts.
[tex]\to N_U=(N_U+N_{pb})e^{\lambda Ut}[/tex]
[tex]\to 1 = (1+3) \ exp[(\frac{-\ln(2)}{t_{(half)}} \times t ]\\\\\to t = [\frac{\ln(4)}{\ln(2)}] \times t_{(half)}[/tex]
[tex]= 14 \times 10^8 \ \ years\\\\=1.4 \ billion \ \ years[/tex]
I’ll give the brainliest
What will happen to buildings, statues and canyons where water flows through them over many years?
Answer:
Water gradually degrades them until the metal parts rust and the other materials deteriorate.
Explanation:
Which of the following uses electrical energy?
A washing machine
The sun
A plant
A cat
Answer:
★ B. A washing machine.
Explanation:
What's Electrical energy?
Electrical energy is energy derived from electric potential energy or kinetic energy. When used loosely, electrical energy refers to energy that has been converted from electric potential energy.
how does dipping an iron bucket in Molten zinc protect it?
Answer:
It forms a barrier that prevents corrosive substances from reaching the underlying steel or iron. The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc. The zinc protects its base metal by corroding before iron.
Explanation:
Answer:
It protects it from corrosion.
Explanation:
Zinc protects iron and steel from the relentless forces of corrosion. Galvanizing iron and steel by dipping them in molten zinc creates an alloy that can, in the right environmental conditions, protect the iron or steel beneath it for 100 years or more.
How are the testes and the ovaries similar?
They are part of the human skeleton.
They are reproductive organs.
They are sensory organs.
They produce sperm.
How many mL of a 1.63 M solution would contain 12 g of Na(OH)?
Answer:
89 mL of solution would contain the given amount of Al(NO₃)₃.
Explanation:
Hope this help
What variables are used to calculate speed
S /\ Speed
mph, km/h, ft/s
Answer:
Calculating speed, distance and time
We can use formulas to model real-life situations. For example, the formula for calculating speed is speed = distance ÷ time. It is possible to calculate the speed, distance or time if you have the other two values.
Explanation:
PLEASE Answer asap! What characteristics are shared by all alkali metals and alkaline earth metals?
A. They conduct electricity very well
B. They are strong and shiny
C. They form alkaline solutions when mixed with water
D. They do not react with water at all
Answer:
C
Explanation:
Mostly all of them but most likely C
How much force is needed to accelerate a 1000-kg car at a rate of 3 m/s2? a 1003 N b 0.003 N c 3000 N d 333.3 N
Answer:
Option c.
Explanation:
According to Newton's law, formula to solve this problem is:
F = m . a
Mass → 1000 kg
a → 3 m/s²
F = 1000 kg . 3m/s² → 3000 N
1 N = 1 kg . m/s² according to SI, Internation System of units.