Consider the structure of vitamin a1 c.o't''e~'ll (c2oh3oo). vitamin a1 should be less soluble in water than in oil.
What is structure of vitamin?
Vitamins perform a variety of biological processes. The proliferation and differentiation of cells and tissues is regulated by vitamin A. Vitamin D performs a hormone-like function by controlling how quickly bones and other organs use minerals. The B complex vitamins serve as cofactors (coenzymes) for enzymes or as their precursors.
Therefore,
Consider the structure of vitamin a1 c.o't''e~'ll (c2oh3oo). vitamin a1 should be less soluble in water than in oil.
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A sample of water has a volume of 560
mL and a mass of 560 g. What is the
density of the water?
Explanation:
density=mass÷volume
density= 560÷560
density= 1 g/mL
As a rule of thumb, the air leaving the evaporator will be about ____ than the air entering the evaporator.
As a rule of thumb, the air leaving the evaporator will be about 17-20° cooler than the air entering the evaporator.
The refrigeration cycle can justify the above statement. The refrigeration cycle depicts the transfer of the heat.
Heat is rejected by the condensor and it is absorbed by the evaporator. The refrigerant when enters in the evaporator, it is a cold low pressure liquid. Then the refrigerant starts boiling and then soon evaporates. This evaporation creates a cooling effect and the heat is removed and carried to be dumped in condensor.
The heat which is removed from the air and flowing over the evaporator makes the air feel cooler. This cooler air is then blew back by the evaporator fan back into the space which is being cooled.
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In joining two molecules by dehydration synthesis, a(n) ______ group is removed from one molecule and a(n) ______ from the other; a new chemical bond then forms between the molecules.
In joining two molecules by dehydration synthesis, a(n) hydroxyl (-OH) group is removed from one molecule and a(n) hydrogen (H) from the other
Dehydration reactions can be defined as the is the reaction in which a molecule of water is eliminated from the reactant molecule. here dehydration synthesis means the process of combination of two molecules with the elimination of water molecules. that's why hydroxyl (-OH) group is removed from one molecule and hydrogen (H) loses from the other this two functional group are removed and then a new chemical bond then forms between the molecules.
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the combustion of one mole of liequid hexane releases 3800kj. when 2.3 g of hexane is combusted in a bomb calorimeter
2.3 g of hexane is combusted in a bomb calorimeter.
What is combustion of hexane?
Hexane also engages in hydrocarbon combustion, forming carbon dioxide when combined with oxygen. The complete combustion of hexane yields the following chemical equation: The burning of hydrocarbons releases heat energy and is an example of an exothermic reaction.
Strong intermolecular interactions make up the non-polar, extremely volatile molecule known as hexane. It burns, releasing carbon dioxide and water as a byproduct.
2C6H14 + 19O2 → 12CO2 + 14H2O
Combustion of 1 mole of hexane releases 3800KJ of energy.
86 g hexane = 1 mole
Thus, 2.3 g hexane = 2.3/86 mole = 0.0267 mole.
Thus combustion of 0.0267 mole of hexane releases 3800*0.0267 KJ energy = 101.46 KJ energy. in a bomb calorimeter.
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Suppose it takes 12.69 ml of 0.0026 m i2 solution to reach the end point of the titration. how many moles of vitamin c are present?
Moles of vitamin c are present is 3.299 x 10^-5 mol
Sol:
12.69 mL x 1L/1000mL x 0.0053 M
What is mole?
A fundamental unit of measurement used by chemists is the mole. Chemists use moles to quantify extremely small substances like atoms, molecules, or other particles.
Simply put, a mole is a measuring unit. It's one of the International System of Units' seven foundation units, in reality. Units are created when preexisting ones are insufficient. At the same time that using absolute numbers of atoms, molecules, or ions would be unclear, chemical reactions frequently occur at low concentrations where using grams would be inappropriate.
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What is the approximate dihedral angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane?
180° angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane.
conformatio Results from bond rotation, they may be interconverted by bond rotation but interconversion does NOT require the breaking of bonds, Virtually every molecule, except the simplest and most rigid, has many possible conformationsIn it the bond rotates and interactions between atoms and their electron clouds create torsional strain and steric strain in the molecule and the preferred conformations are those of lower energy where strain is minimized.the less stearic hindrance the most stable configuration, the big molecules create the most stearic hindrance dipole moment also defines the stability of conformational structure.To know more about diequatorial conformation visit : https://brainly.com/question/14703697
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the mass spectrum for an unknown element is shown above. according to the information in the spectrum, the atomic mass of the unknown element is closest to 90amu 90 a m u 91amu 91 a m u 93amu 93 a m u 94amu
Because 1s electrons are most attracted to the nucleus, peak X results.
For A(27.977 u)
Mass number = 27.977
Abundance = 78.21%
For B (28.976 u)
Mass number = 28.976
Abundance = 1.346%
For C(29.974 u)
Mass number = 29.974
Abundance = 20.444%
Averages atomic mass
= (Mass of A x abundance of A)/100 + (Mass of B x abundance of B)/100 + (Mass of C x abundance of C)/100
= (27.977x78.21)/100 + (28.976x1.346)/100 + (29.974x20.444)/100
= 21.8808117 + 0.39001696 + 6.12788456
= 28.40
What is a nucleus?In terms of genomics, a nucleus is the organelle within a cell that is membrane-enclosed and houses the chromosomes. The nuclear membrane has a variety of pores that enable the selective passage of specific molecules (such proteins and nucleic acids) into and out of the nucleus.
The nucleus carries the genes, structures that hold the genetic information, and controls and regulates the functions of the cell (such as growth and metabolism).Inside the nucleus, tiny structures known as nucleoli are frequently seen. The gel-like matrix in which the nuclear components are suspended is known as the nucleoplasm.
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Which actions are part of the scientific process? Select all that apply.
A] Experiments
B] hypotheses
C] Observations
D] Conclution
Please help i give brainly!!!!!
The actions that are part of the scientific process are as follows:
ExperimentsHypothesesObservationsConclusionWhat is the scientific method?The scientific method is a method of discovering knowledge about the natural world based in making falsifiable predictions called hypotheses, testing them empirically, and developing theories that match known data from repeatable physical experimentation.
The scientific method is made up of the following processes:
Making an observation or asking questionsConstructing an hypothesisTesting the hypothesis via experimentationAnalyzing the dataMaking a conclusionTherefore, the actions that are part of the scientific process are as follows:
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There is virtually no matter between the Earth and the Moon, only empty space.
Image courtesy of NASA
Yet the Earth and Moon are able to exert a force on each other because
Answer:
of gravity
Explanation:
lmk if this is wrong
a certain ore is 35.4% nickel by mass. how many kilograms of this ore would you need to dig up to have 55.0 g of nickel?
If a certain ore is 35.4% nickel by mass. To have 55.0 g of nickel, we have to dig up 0.155 kg of this ore.
Mass percent of Nickel = (mass of Nickel/mass oft he ore)×100
= 35.4%
This means that in 100 g of ore we have 35.4 g of nickel.
So, 35.4 g of Nickel is present in = 100 g of the ore
1g of Nickel is present in = 100/35.4 g of the ore
55.0 g of Nickel is present in = (100/35.4) × 55.0 g of the ore
= 155.3 g of the ore
1 g = 1/1000 kg
155.3 g = 155.3/1000 kg
= 0.155 kg
So, we need to dig 0.155 kg of the ore to get 55.0 g of Nickel.
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Which phrase describes a chemical change?
O an exploding firecracker
O a freezing ice cube
O wood breaking into splinters
O a wire conducting electricity
the radius of a aluminum atom is 143 pm. how many aluminum atoms would have to be laid side by side to span a distance of 4.23 mm? atoms
the no. of Al atoms required to be laid side by side to make up a distance of 4.23 mm is = 4.23/(2 * 143 * 10^(-9) )
= 14790210 atoms of Al.
What is the radius of an atom?
The atomic radius of an atom is the distance between the centre of the nucleus and the outermost electron in each of its energy shells. Since the border is not a clearly defined physical entity, there are many non-equivalent definitions of atomic radius. The four most popular ways to define atomic radius are van der Waals radius, ionic radius, metallic radius, and covalent radius. Due to the challenges of isolating individual atoms to measure their radii, atomic radii are frequently measured in a chemically bonded state; yet, theoretical calculations are simpler when individual atoms are taken into account.
1 pm = 10^(-9) mm
radius of Al atom = 143 pm = 143 * 10^(-9) mm
Diameter of Al atom = 2 * 143 * 10^(-9) mm
Thus, the no. of Al atoms required to be laid side by side to make up a distance of 4.23 mm is = 4.23/(2 * 143 * 10^(-9) )
= 14790210 atoms of Al.
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what is 26.1 celsius converted to kelvin
Answer:
299.25, or if you round it up 300
Formula to find kelvin: Celsius + 273.15 = Kelvin
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day :)
What does volume measure? name two different units that might be used to measure volume.
Answer:
mL,L,cm^3
Explanation:
Genetic testing cannot be used to determine _____.
1.life-threatening accidents
2.potential for developing genetic diseases
3.DNA identity of a criminal
4.the identity of a genetic disease presenting symptoms
Answer:
4.the identity of a genetic disease presenting symptoms
Explanation:
The compound mnco3 is an ionic compound. what are the ions of which it is composed?
Manganese(II) ions are arranged in MnCO3 in an octahedral coordination geometry, giving it a structure similar to that of calcite.
What is octahedral coordination?The shape of compounds with six atoms or groups of atoms or ligands symmetrically grouped around a central atom, defining the vertices of an octahedron, is described by octahedral molecular geometry, also known as square bipyramidal, in chemistry. The prefix octa refers to the octahedron, which has eight faces. Although octahedral compounds typically have an atom in their center and no links between the ligand atoms, the octahedron is one of the Platonic solids.
To the point group Oh belongs a perfect octahedron. Molybdenum hexacarbonyl Mo(CO)6 and sulfur hexafluoride SF6 are two examples of octahedral chemicals.
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What is the major elimination product obtained from the reaction of each of the following alkyl halides with hydroxide ion?
The major elimination product is 2-methylbut-2-ene and the structure can be seen as followed in the diagram attached.
The outcome of an elimination reaction is what?An elimination reaction’s main byproduct is often the more substituted alkene. This is due to the lower energy and faster progressing transition state that leads to the more substituted alkene.
What is the location of the elimination product?It is critical to first identify the electrophilic carbon in the substrate in order to determine the potential products. Next, list every hydrogen on every carbon that is next to the electrophilic carbon. Every distinct neighboring hydrogen has the potential to create a distinct elimination product.
What is an example of an elimination reaction?The kind of atoms or groups of atoms that are expelled from the molecule is a frequent way to identify elimination reactions. The elimination of a halogen and an atom of hydrogen
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select all of the following that apply to lipids. multiple select question. consist mostly of polar chemical groups contain mostly carbon and hydrogen do not dissolve in water high oxygen content
Select all of the following that apply to lipids. contain mostly carbon and hydrogen ,do not dissolve in water
What is lipids in simple terms?A lipid is any of varied organic compounds that are insoluble in water. They include fats, waxes, oils, hormones, and certain components of membranes and performance as energy-storage molecules and chemical messengers.
What is lipids in human body?Lipids are fatty, wax like molecules found within the human body and other organisms. They serve several different roles within the body, including fuelling it, storing energy for the longer term , sending signals through the body and being a constituent of cell membranes, which hold cells together.
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Which statement describes the particles that make up the rigid structure of a
three-dimensional crystalline solid?
A. They move around freely to various locations in a random pattern.
B. They move more quickly than the particles in the liquid of the
substance.
C. They move more quickly than the particles in the gas of the
substance.
D. They move by vibrating in their locations within a fixed pattern.
SUBMIT
The statement that describes the particles that make up the rigid structure of a three-dimensional crystalline solid is:
They move by vibrating in their locations within a fixed pattern; option DWhat are the nature of the particles in a solid?Solids are one of the three states in which matter exists.
Solids are characterized by their having definite shapes and volumes.
Solids have definite shapes and volumes because of the arrangement of the particles in a solid.
The intermolecular forces of the particles in a solid are very strong such that the particles are not free to move but vibrate about a fixed position.
Thus, they are arranged in rigid continuous patterns as seen in solid crystals.
In conclusion, the particles in a crystalline solid are arranged in regular repeating patterns forming a three-dimensional structure.
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what name is given to this molecule? a positively charged molecule. this molecule consists of three hydrogen atoms bonded to an oxygen atom. what name is given to this molecule? a positively charged molecule. this molecule consists of three hydrogen atoms bonded to an oxygen atom. methane hydronium ion water glucose hydroxide ion
Hydronium ion are positively charged molecule
Here as per given data hydronium ion are positively charged molecule consists of three hydrogen atoms bonded to an oxygen atom, this molecule is written as H3O⁺ that's why it is called hydronium ion. this means that in the bond between hydrogen and oxygen and oxygen pull harder on the shared electrons thus causing a partial negative charge on the molecule and causing it to be attracted to the positive charge of H⁺ to form hydronium.
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A neutral atom has a mass number of 80 and has 45 neutrons. write its atomic symbol.
A neutral atom has a mass number of 80 and has 45 neutrons.
What is mass no.?
mass number The total of the protons and neutrons is how it is described. The atomic mass of a specific atom is nearly equivalent to the mass number.
For the given problem, we have mass no = 80
Now, we know that, mass no. = no. of (neutrons + protons)
Hence here, no of protons = 80-45 = 35,which is again equal to the no of electrons, which corresponds to the atomic no. of a specific element. Here atomic no 35 corresponds to Bromine atom and its symbol is Br.
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What are two ways engineers use their understanding of ke and pe to make their designs safer
The energy formed in a system by the motion of particles is called kinetic energy. which is half of the product of the mass and volume
k.E = mv^2/2
When someone is riding on an amusement ride also known as a roller coaster, due to the nature of the turns and slope, energy will change from potential to kinetic energy and it will be repeated a couple of times throughout the course of the ride.
The energy stored in the system when it's at a rest is called potential energy, the energy is converted into kinetic energy. when it starts moving. The potential energy is stated as the product of the mass, height, and acceleration due to gravity.
Normally, the amusement ride vehicles will be pulled up from the first hill by a chain and as the other vehicles follow that route in climbing, and they will then gain potential energy
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caffeine (c8h10n4o2) is the world's most consumed psychoactive drug. it's common name is 1,3,7-trimethylxanthine. it is completely absorbed within 30 to 45 minutes and it effects diminish within about three hours. what is the molarity of a solution that contains 14.1 g of caffeine dissolved in 942 ml of solution? enter to 4 decimal places.
The molarity of a solution that contains 14.1 g of caffeine dissolved in 942 ml of solution is 0.0770 mol/l.
The formula for molarity is,
M = n / V
where, M = molarity of solution
V = volume of solution in litres
where, n = given mass / molar mass
n = 14.1 /194.19
n = 0.0726
So, molarity is
M = 0.0726 / 0.942
M = 0.0770 mol/l
Therefore, molarity of a solution that contains 14.1 g of caffeine dissolved in 942 ml of solution is 0.0770 mol/l.
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Volatile chemicals are agents that are able to change easily from a ________ into a ________.
Volatile chemicals are agents that are able to change easily from a liquid into a gas.
What are volatile substances?
In the field of chemistry, "volatile" refers to susbtances which vaporise easily .Volatility can be defined as the measure on how fast the conversion of liquid to gas phase takes place.learn more about volatile substances
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Silicon has an atomic number of 14 and a mass number of 28. how many neutrons are found in silicon?
Silicon is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster.
How many neutrons are found in silicon?
The mass number is defined as the sum of total numbers of protons and also the numbers of neutrons which is present in the nucleus of an atom is called the mass number. So as we know that the number of proton present in silicon is 14, so by subtracting the number of neutrons from the mass number of silicon, we get 14 which shows the numbers of neutrons in the nucleus of the silicon. Silicon is an element which is denoted or represented with the symbol Si and atomic number 14. It hard in structure, with a blue-grey metallic luster.
Silicon has 14 protons and 14 neutrons. Its atomic number is 14 and its atomic mass is 28.
So we can conclude that there are 14 number of neutrons present in the nucleus of the silicon atom.
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A sample of pentanol, c5h12o, contains 0.185 mol of the compound. what is the mass of the sample, in grams?
The mass of the sample is 18.3g
What is mass?The total amount of matter in a physical body is known as mass. This property also measures inertia, or the body's resistance to acceleration (change of velocity) when a net force is applied. The mass of an object also affects the gravitational attraction it exerts on other bodies.
The kilogram is the fundamental mass unit of SI (kg). Although mass is frequently established by measuring an object's weight on a spring scale rather than a balancing scale and directly comparing it with known masses, mass and weight are not the same things in physics. Although there is less gravity on the moon than there is on Earth, an object would nonetheless have the same mass.
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what mass of ammonium thiocyanate must be used if it is to react completely with 6.7 g barium hydroxide octahydrate?
3.04 gm of ammonium thiocyanate is used to react completely with a molecular mass of 6.7 gm of barium hydroxide octahydrate.
What is molecular mass?The total atomic masses of all the atoms in a molecule make up its molecular mass. The molecular mass indicates a molecule's mass in relation to the ¹²C atom, whose mass is assumed to be 12. Although molecular mass is a dimensionless number, it is assigned the unit Dalton, also known as the atomic mass unit, to indicate that it is equivalent to 1/12th the mass of a single carbon-12 atom.Although it is often accepted that molecular weight and relative molecular mass are synonymous, in actuality, the two terms are very varied.A weighted average equivalent to the molar mass but with different units is usually employed when the molecular weight is used with the units Da or u.The molecular weight, which is stated in kDa and is used in molecular biology to describe the mass of macromolecules, is frequently imprecise and denotes an average.
Ba(OH)₂.8H₂O + 2NH₄ScN⇒ Ba(ScN)₂ + 10H₂O + 2NH₃
weight = Molecular mass × Number of moles
moles of barium hydroxide octahydrate = 6.5/315 = 0.02 M
moles of ammonium thiocyanate = 2 × 0.02 = 0.04 M
weight of ammonium thiocyanate required = 0.04 × 76.1 = 3.044 gm.
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The lab experiment introduces you to the chemistry of elemental copper. Copper will undergo several chemical transformations, represented by the chemical formulas given. What is the correct sequence of chemical transformations with the correct phases? begin with 1 and and with 6.
The proper order of chemical reactions of copper in the right phases is
1. Cu(s) 2. Cu(NO3)2 (aq) 3. Cu(OH)2 (s) 4. CuO (s) 5. CuSO4 (aq) 6. Cu(s)
What are the properties of copper?
One of the first metals that people used was copper. The primary causes of this are the fact that it is a native metal, meaning it can be found naturally in a usable state, and that it possesses advantageous metallurgical qualities. Malachite, cuprite, azurite, bornite, and chalcopyrite are other minerals that naturally include it.
Copper is softer than zinc and has a bright finish when polished. Along with silver and gold, it can be found in group Ib of the periodic table. Chemical reactivity is minimal for copper.
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how do I write both conversion factors for converting L to ML
The capacity of a liquid is measured in metric units of volume called litres and millilitres.
There are four units of measurement for liquid volume: millilitres, centilitres, litres, and kiloliters.Liter is a fundamental metric unit that measures liquid volume and is equal to one cubic decimeter.The millilitre is a more compact metric unit that measures a liquid's volume or capacity. It is equivalent to one thousandth of a litre and is used to measure smaller amounts of liquid.By dividing the given amount by 1000, we may convert the given amount to millilitres. Let's, for illustration, convert 6 litres to millilitres. So, 6 × 1000 Equals 6000 ml. 6 litres hence equal 6000 millilitres.It should be remembered that we must divide the supplied amount by 1000 in order to convert from millilitres to litres. Let's convert 7000 millilitres to litres as an example. 7000 x 1000 equals 7 litres. So, 7000 millilitres equals 7 litres.A crucial component of measurement is unit conversion, which is done using the appropriate quantity conversion factor.
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First Steps
THE LANDING
As the lander hit, Maria drew a jagged breath, and her chest muscles clenched tight with anxiety. Captain Curran, the group leader, turned around and smiled at Maria and her five friends.
“All right,” he said with forced joviality. “Who wants to be the first of the generations born in space to set foot on a real planet?”
Maria waited for someone else to speak or raise their hand. Next to her, Allen just stared at the floor of the lander muttering, “Not me, not me.”
She glanced at Lily, who Maria had always known to be fearless, but Lily bit her lip and turned away. Javier looked positively gray, and the twins buried their faces in their hands. Someone would have to be first. Maria closed her eyes and took a few meditative breaths, waiting for someone else to volunteer, but the lander was silent.
FINDING COURAGE
The radio crackled to life. “Lander one, this is Mothership, do you copy?”
“Yes,” Captain Curran answered. “We’ve landed safely and are waiting to exit the lander, but there’s just a little…disagreement…over which pioneer wants to be the first to set foot on our new home.”
“Tell them there’s plenty for everyone to see, and they’re going to love it out there,” the voice on the radio responded. “I wish it were me instead of you; I miss the feel of real air on my face.”
Captain Curran flipped off the microphone. “You six have lived your entire lives in space, and it’s a great privilege to be the first of your generation to see a new planet. The others are watching; if you’re afraid, they’ll be afraid. Can’t any of you find the courage to set an example?”
Maria shifted uncomfortably in her seat and thought of her parents; they had traveled across the galaxy to find their family a new home, with clean air and good soil, and she knew this planet was for them. “I’ll do it, Captain,” she mumbled as she slipped out of her harness and rose out of her seat. Maria couldn’t shake the feeling of trepidation as she stood and watched the doors of the lander slide open.
A NEW WORLD
A burst of air hit Maria in the face. She scrunched up her nose as an unfamiliar assortment of odors hit her nostrils. Some smelled sweet, some disgusting, and some were just strange. There were never strange smells on the ship; everything was always the same there. What was it going to be like to live where things changed? The rest of the children gathered around the opening as she climbed down the ladder, and Maria tried to smile as she met their worried eyes. Then, suddenly, something crunched underneath her boots; she was standing on the surface of the planet, and it felt nothing like the smooth metallic halls that she’d known all her life.
Without letting go of the ladder, she turned around to look at the world around the lander. The soil was full of shapes and textures; there were some small, grainy pieces, then larger clumps that she could break with the toe of her boot. One piece was hard and smooth, and she let go of the ladder to pick it up. “Captain,” she called, “I think I’ve found a rock!”
The air was moving, and long, thin, green things bowed and danced. “Grasses,” Maria whispered to herself, remembering the videos in her science lessons. She let go of the ladder and took soft, slow steps and realized her arms and legs felt like they were full of lead. “Natural gravity,” she whispered to herself. She started to walk a little more quickly, getting used to the new sensation. She was doing what others had previously thought impossible—taking steps on a new world.
A creature with gossamer wings landed on her nose, and she crossed her eyes trying to get a good look at it. Something small and furry scurried across her feet as she spun in a slow circle. Inspired, she ran as fast as she could across the foreign soil; she’d never seen somewhere so big, and it was thrilling. Suddenly, a deep, low sound echoed around her.
“That’s the call of a hornbeast,” Captain Curran shouted from the bottom of the ladder. Maria glanced back and saw that he was helping her friends take tentative first steps in the new world. “Walk to your left a little, and there should be a stream—flowing water on the ground; they often go there to drink, the explorers say.”
She started to run in that direction and then paused. “Hurry up!” she yelled, unable to contain her enthusiasm. “Our new home is extraordinary!”
Question
In “First Steps,” which theme is developed by Maria’s volunteering to leave the lander?
Some things cannot be learned in school.
Some things cannot be learned in school.
It takes courage to be the first to try something new.
It takes courage to be the first to try something new.
Taking unnecessary risks is foolish.
Taking unnecessary risks is foolish.
Great tasks can be accomplished by working as a team.
Answer:
I think it is C. It takes courage to be the first to try something new.
Explanation:
The story showed her courage to the first to try something new.
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