Answer:
Different elements together that can be separated again
Answer:
a mixture is a material made up of two or more different substances which are physically combined.
Explanation:
Two internal sources of energy for Earth are
A.rotational energy.
B.solar energy
C.geothermal energy
What is a half-life of an isotope? please help
Answer:
Explanation:
Hello! Hope this helps!
One important measure of the rate at which a radioactive substance decays is called half-life, or t1/2. Half-life is the amount of time needed for one half of a given quantity of a substance to decay. Half-lives as short as 10–6 second and as long as 109 years are common.
If 12.4 mol of Ne gas occupies 122.8 L, how many mol of Ne would occupy 339.2 L under the same temperature and pressure? Record your answer in scientific notation using 3 significant figures.
Answer:
3.43×10¹ mol
Explanation:
Given data:
Initial number of moles = 12.4 mol
Initial volume = 122.8 L
Final number of moles = ?
Final volume = 339.2 L
Solution:
The number of moles and volume are directly proportional to each other at same temperature and pressure.
V₁/n₁ = V₂/n₂
122.8 L/ 12.4 mol = 339.2 L / n₂
n₂ = 339.2 L× 12.4 mol / 122.8 L
n₂ = 4206.08 L.mol /122.8 L
n₂ = 34.3mol
In scientific notation:
3.43×10¹ mol
(BrainPop Will give brainliest)
Based on the information from the movie, what can you conclude about the most common chemical compound on earth?
A) It's oxygen incorrect answer
B) It's hydrogen gas incorrect answer
C) It's carbon dioxide incorrect answer
D) It's water
Answer: What movie? The one where i ate chicken. (I eat chicken at all times)
Explanation: Its oxygen anyway
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Oxygen is the most common chemical compound on earth. The correct option is option A.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Oxygen and water are the most abundant on earth. Carbon dioxide and hydrogen gas are the rarest. Out of Oxygen and water, oxygen is the most abundant gas on the earth. Carbon dioxide are mostly released on combustion. two third of earth surface is covered by water.
Therefore, oxygen is the most common chemical compound on earth. The correct option is option A.
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Make an observation about the average height of the beanbag. How does it compare with your calculated kinetic energies for each speed? Does the height of the beanbag increase in equal increments with each step up in speed? Record these qualitative observations in Table B.
Answer: The kinetic energy in the solid and liquid phases is the same. The kinetic energy of the substance's particles will depend on the volume of the substance. The particles have less kinetic energy in the liquid phase than they do in the gas phase. They vibrate so quickly that the particles ionize and become plasma.
Compare and contrast how observations and results can be used to support a conclusion to an experiment.
Answer:
Difference between Observation and Results:While performing any ex
Explanation:
What units would you use to measure a virus?
1.Nanometers
2.micrometers
3.millimeters
Answer:
(B Nanometers
Explanation:
Most viruses vary in diameter from 20 nanometres (nm; 0.0000008 inch) to 250–400 nm; the largest, however, measure about 500 nm in diameter and are about 700–1,000 nm in length. Only the largest and most complex viruses can be seen under the light microscope at the highest resolution.
PLSS HELP ME! Read each statement below and decide if you agree or disagree. Write Agree or Disagree below each statement, based on your decision.
1. Temperature is the measurement of how hot or cold something is.
2. When something heats up, new energy is created, and when something cools down, energy is destroyed.
3.When something heats up, it moves faster, and when something cools down, it moves slower.
4. Hotter things have more energy than colder things.
Answer:
1. Temperature is the measurement of how hot or cold something is.
agree
2. When something heats up, new energy is created, and when something cools down, energy is destroyed.
disagree
3.When something heats up, it moves faster, and when something cools down, it moves slower.
agree
4. Hotter things have more energy than colder things.
agree
Please help y’all I don’t understand
Answer:
the last one
Explanation:
Which of these minerals would most likely be valued as a gem and used in jewelry?
olivine, a green or gray mineral with a hardness rating of 6.5
gypsum, a pink or white mineral with a hardness rating of 2
galena, a metallic silver mineral with a hardness rating of 2.5
science
Answer:
b? I hope this helps! Let me know :)
Explanation:
Ancient plants captured solar energy from the sun, which eventually produced
A.geothermal energy
B.fossil fuels
C.greenhouse gases
D.infrared radiation
Answer:I think it’s B. Fossil Fuels
Explanation:
Please help!
1.Ionic compounds are formed when.
-metal reacts with non metal
-metal reacts with metal
-when non-metal reacts with non-metal
2.True or false. Ionic bonds are electrostatic forces.
-True
-False
3.Sodium loses one electron when it reacts with.
-Magnesium
-potassium
-Chlorine
forces start and change the motion of on object.
A: True
B: False
A leaf on a tree stars moving when the wind blows on it how is this an example of newton's first
A. the wind exerts a force on the leaf causing its motion to change
B the wind exerts no net force on the leaf because it is not a push or pulls
C. the leaf stops moving even though the wind continues to blow
PLEASE HELPPPP!!!!!!! (for science)
Nora notices water droplets on the grass in the morning. It did not rain during the night. Which statement is true about this change of state?
1. Mass was added to the water particles, resulting in a deposition.
2. Energy was added to the water particles, resulting in evaporation.
3. Mass was removed from the water particles, resulting in sublimation.
4. Energy was removed from the water particles, resulting in condensation.
Answer:
4
Explanation:
because morning dew is condensation
all minerals on the mohs hardness scale are hard enough to scratch a piece of glass is it true or false
PLEASE I NEED HELP
science
How will the concentration of H+ and OH− ions change when a substance with a pH 11.4 is added to water?
A) Both H+ and OH− will increase
B) Both H+ and OH− will decrease
C) H+ will increase and OH− will decrease
D) H+ will decrease and OH− will increase
Answer:
option d is the answer
hope it helps
Answer:
The answer would be D.
:D
A graph with horizontal axis time (seconds) and vertical axis position (meters). An orange line runs straight upward from 0 second zero meters. A concave blue line runs upward from the same point. Maia says that both lines on this position vs time graph show acceleration. Is she correct? Why or why not?
Answer:
Let's start by using the definition of acceleration. Acceleration is defined as the change in velocity over the change in time. In equation, that would be Δvelocity/Δtime. Based on the axes of the given graph, it shows the trend of position over time. So, the slope of the line and the curve shows the change of position over change of time, Δdistance/Δtime. In physics, this is the definition of speed or velocity. So, Maia is incorrect. Both curves show the speed or velocity of the object, and not acceleration. If the graph used a y-axis of velocity instead of position, then only at that instance, would be Maia be correct.
The difference between the two is, the straight line shows constant velocity while the curve line shows changing velocity.
Explanation:
Maria is incorrect because the line or curve shown in the graph gives value of velocity not of acceleration.
What is acceleration?Acceleration of any object is dfine as the rate of change in velocity with respect to the distance.
According to the question, graph is plotted between time and distance so slope of the graph gives the value of change in position with repect to the time and this is used to define velocity as:
v = dx/dt
So, maria is incorrect.
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Can someone help me like please
Answer:
the last one
Explanation:
one atom had a higher electronegativity than the atom it is sharing with.
The force of gravity on Planet Y is 5.3 m/s2. The force of gravity on Planet Z is 6.2 m/s2. A 10 kg object would: weigh more on Planet Y than on Planet Z weigh less on Planet Y than on Planet Z weigh the same on Planet Y as on Planet Z
Answer:
every thing would weigh less on planet y because weight = m(mass)g(gravity) and planet y is 5.3x10=53 and planet z is 6.2x10=62. 62 is greater than 53 so everything on planet y would weigh less than everything on planet z so the answer is b
Explanation:
4) Finish the analogy related to atoms and matter:
atom is to element as_________________ is to compound
AND letter is to ____________________
Sara determined the kinetic energy (in joules) for each throw and recorded her results in the shaded rows below. however, she accidentally spilled some water on the lab book and cannot see the last number.
what is the value of the missing data point? explain how you got your answer
Answer: I would say the answer is 120J
Explanation:
Answer:
32 J
Explanation:
because if each of the sets in the table are constant then the unit rate both masses is 2 so i simply multiplied 16 by 2 to get 32
Because a glass window is harder than a fingernail, a glass window
would have a higher number on the Mohs Hardness Scale.
would have a lower number on the Mohs Hardness Scale
would have the same number as a fingernail on the Mohs Hardness Scale.
science
Answer:
Because a glass window is harder than a fingernail, a glass window would have a higher number on Mohs hardness scale
Explanation:
What is it called when a girl is romantically and sexually attracted to women but find men attractive?
(what is the name of the sexuality?)
Answer:
i think is biromantic, homosexual woman is romantically attracted to people of multiple genders, but is only sexually attracted to women. A biromantic, homosexual man is romantically attracted to people of multiple genders, but is only sexually attracted to men.
Explanation:
i hope this help :/
Answer:
bisexual, or leaning towards fully homosexual
Explanation:
if a girl has zero romantic nor sexual attraction toward men, then that would be phrased as homosexual. but if there is some sort of attraction at all, i i️ would consider that as bisexual. whatever term you feel most comfortable using, you should be confident in!! you are valid, hope this helps :)
At STP a gas occupies a 26.4 kiloliter balloon. How many mol of the gas must be in the balloon? Answer as a whole number.
Hello!,I'm Lyo, and I'm a Brazilian teacher.
this gas is hydrogen.
Molar mass (M.M): stp = 22.71 Mol/liters
good studies for you!
A manual contains instructions for how to build a variety of structures using a set of interlocking bricks. If this scenario is used as a model for genetic information, which statement is correct?(1 point)
The manual is a gene.
The manual is a chromosome.
Each set of instructions is a protein.
Each structure is a gene.
A manual contains instructions for how to build a variety of structures using a set of interlocking bricks. If this scenario is used as a model for genetic information, which statement is correct?(1 point)
The manual is a gene.
The manual is a chromosome.
Each set of instructions is a protein.
Each structure is a gene.
Answer:
Explanation:The manual is a chromosome.
If the given scenario is used as a model for genetic information, then "the manual is a chromosome" is the correct statement. Therefore, option (B) is correct.
What is a chromosome?A chromosome can be defined as a long nucleotide sequence that consists of linear arrangements of genes. In a chromosome, each DNA strand comprises a nucleotide sequence that can encode proteins that are different genes.
The human body has 23 pairs of chromosomes and this unique structure of the chromosome does DNA tightly packed with histone proteins to fit in the cell and helps in giving stability to it. The unwound DNA of a single cell measures 6 feet, with this we can understand the need for packaging in the nucleus of each cell.
Chromosomes can be seen in cell division as they ensure that DNA will be divided between the daughter cells in the cell division. Even a little irregularity in the process can cause many deformities and diseases.
A chromosome can be considered as manual containing instructions for how to build various types of structures using a set of interlocking bricks means nucleotides.
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Students are asked to correctly identify the reactants and products of this chemical reaction. Which of the following explanations is correct? A. Sam says that nitrous acid and nitric acid are the reactants; water and nitrogen dioxide are the products. B. George says that nitrogen dioxide and water are the reactants; nitrous acid and nitric acid are the products. C. Jan says that nitrogen, hydrogen and water are the reactants; oxygen and acid are the products. D. Erin says that nitrogen dioxide and water are the reactants; nitrogen is the product.
Answer:b
Explanation:
He is correct
Answer:
B. George says that nitrogen dioxide and water are the reactants; nitrous acid and nitric acid are the products.
Which two statements best describe how oceans affect climate?
A.They have warm and cool currents that affect weather on nearby land.
B.They have warm and cool currents that move the air masses above them.
C.They make temperatures in nearby areas slightly colder than freezing
D.They make temperatures in nearby areas slightly milder.
Please help asap
The effects of climate on ocean are:
A.They have warm and cool currents that affect weather on nearby land.
D.They make temperatures in nearby areas slightly milder.
Climate type of the ocean:As ozone harming substances trap additional energy from the sun, the seas are retaining more hotness, bringing about an expansion in ocean surface temperatures and climbing ocean level. Changes in sea temperatures and flows achieved by environmental change will prompt modifications in environment designs all over the planet.
Thus, options A and D are correct.
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A student is pulling a large recycling bin. A teacher fills it with old papers to recycle. What property of the bin changes, and in what way? What does the student have to do to keep the bin moving at the same speed?
Answer:
the mass use his or her force to keep it at the same speed
Explanation:
Help me with this science
Answer:
1. Rain
2.frozen rain
3.clouds
4.when its at its freezing point which is 32 degrees Fahrenheit
5.a form of precipitation with little ice pellets
6.hail is formed when rain is carried up into cold part of the air
7.a thunderstorm
8.its basically just ice
9.It can cause bad dents in a car
10.he was a meteorologist and a photographer
Explanation: