Answer:
5
Explanation:
5
An unknown substance has a volume of 2 cm3 and a mass of 38.6 grams.
What is the density of the sample?
Answer:
The answer is 19.3 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{38.6}{2} \\ [/tex]
We have the final answer as
19.3 g/cm³Hope this helps you
Why does wood float besides it being less dense
Answer:
The only reason wood floats is because it is less dense and has big openings and gaps which allows air in.
Wood that sinks has very tiny openings. The ratio between weight and volume is called density. An object that is less dense than water can be held up by water, and so it floats.
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HELP!!!
write the scientific names of these ionic compounds
Answer:
• Copper chloride
• Copper (II) chloride
• Iron (II) sulfide
• Iron (III) sulfide
how can prey benefit from the predator having a disease?
The disease can slow the predator down and the prey can get away easily.
Chromium-48 decays. After 6 half-lives, what fraction of the original nuclei
would remain?
Answer:
The fraction of original nuclei remaining is 1.5625
Explanation:
7 Which activity occurs in a plant cell but NOT in an animal cell? *
A Energy is released after food molecules are broken down.
B Materials are transported from one part of the cell to another part of the cell.
C Waste molecules are stored in vacuoles.
D Food is produced using light energy.
Answer:
don't know sorry
Explanation:
(-_-)
What elements do these macromolecules
have in common?
Copper, Helium, Oxygen
Carbon, Hydrogen, Oxygen
Calcium, Hydrogen, Oxygen
Carbon, Helium, Oxygen
Answer:
Carbon, Hydrogen, Oxygen
Explanation:
From the prefix "macro" which means large, macromolecules are considered to be "large molecules" when compared to the micromolecules. They come in four major types: proteins, nucleic acids, carbohydrates and lipids.
These macromolecules have three common elements and these are: Carbon, Hydrogen and Oxygen. These are all essential in the vitality of life. The human body is said to have 10% of carbon and 63% oxygen. Hydrogen, on the other hand, is said to be the most abundant element among organic molecules.
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3. Scott and James work at a grocery store. After the grocery store closed, they were playing a game with a shopping cart and Scott’s skateboard. They crashed the skateboard and the shopping cart two times. The shopping cart had more mass in Crash 2 than it did in Crash 1. Use the information in the diagram to answer.
In which crash did the skateboard experience a stronger force? Why?
Answer: B) Crash 2; the force on the cart was stronger in this crash, so the force on the skateboard was also stronger.
Explanation:
Skateboards are subjected or experience to a greater force in Crash 2.
The force applied on the cart 2 was stronger or powerful in this collision 2, thus the force or power on the skateboarding was also higher and greater, according to the statement.
Strong forces usually do more damage to specific items or things.
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Radio waves are primarily used to
Answer:
Radio is used primarily for communications including voice, data and entertainment media.
What is the correct name for the compound P406?
A. Phosphoric acid
B. Tetraphosphorus hexoxide
C. Phosphorus (IV) oxide
D. Phosphorus oxide
Answer:
Phosphorus trioxide
Explanation:
Answer:
Tetraphosphorus hexoxide
Explanation:
Give brainliest please
What are some things that uses oxygen
Answer:
Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.
Which of the following is the correct model of C7H16?
A.
B.
C.
D.
Answer:
D
Explanation:
Option D gives the correct model of C7H16. From the option, one will discover that the model has 7 carbons in the backbone. If you count the attached hydrogen, you will discover that the hydrogen is 16 in total.
This model or skeletal structure of this element represents heptane. Heptane or n-heptane is known to be a straight-chain compound and an alkane. It's chemical formula can also be written as: H₃C(CH₂)₅CH₃ or C₇H₁₆.
This compound is known to be one of the main components of gasoline. It is known to be a volatile organic compound and a clear and colorless liquids with a petroleum-like odor.
Answer: D
Explanation: Just took the test
Plowing is an example of what Energy?
a. Kinetic Energy
b. Potencial Energy
Answer:
mechanical or kinetic eg hammer and nails
Technetium-104 has a half-life of 18.0 minutes. How much of a 165.0 g sample remains after 126 minutes?
Answer:
1.28g
Explanation:
honestly just put it a half life caculator i couldnt tell you how to do it if my life depended on it ♂️
What is the volume of kristas rock
Answer : The volume of kristas rock is 30 mL.
Explanation :
From the given image we conclude that:
Initial volume of liquid = 150 mL
Final volume of liquid = 180 mL
Now we have to determine the volume of kristas rock.
Volume of kristas rock = Final volume of liquid - Initial volume of liquid
Volume of kristas rock = 180 mL - 150 mL
Volume of kristas rock = 30 mL
Therefore, the volume of kristas rock is 30 mL.
Where is the youngest rock in the Atlantic Ocean found?
Answer:
oceanic ridge
The youngest rocks on the ocean floor are located at the oceanic ridge, an underwater mountain range formed from the spreading of tectonic plates in.
Explanation:
1234567891011121314151617181920
The liquid inside a cell is called?
Answer:
cytoplasm
Explanation:
cytoplasm carries the nutrients of the cell
The first column of the periodic table is called the
Kinetic molecular theory states... (choose all that apply)
A. There is a chemical change when a solid melts to a liquid.
B. Particles that make up matter have kinetic energy.
C. Particles that make up matter are always in motion
What is the formula for an alkene containing six carbon atoms?
A. C6H10
B. C2H6
C. C6H12
D. C5H12
Answer:
C
Explanation:
Cyclohexane is a cycloalkane with the molecular formula C₆H₁₂. Cyclohexane is non-polar.
Which element is this.Its shiny,Is solid at room temperature, has atoms with two valence electrons?A:Lithium B:Strontium C:Aluminium D:Silicon
Answer:
Strontium
Explanation:
STRONTIUM
Strontium is a chemical element that is non radioactive and its occur naturally. It is a shiny and silvery white metal that have atomic number of 38 and it belong to group 2 member of the periodic table which is why it have two valence electrons. It is a solid metal at room temperature.
About 99% of Strontium is found in bones. It help to make new bones in humans by replacing the old bones.
Therefore, it is strontium.
Strontium is the element which is shiny, solid at room temperature and has two electrons in its outermost shell.
The atomic number of Strontium is 38. In the first shell, there are two electrons, in the second and fourth shell has space for 8 electrons so these shells are filled with electron whereas third shell has 18 electrons and the fifth shell has 2 electrons. Strontium belongs to second group i.e. alkaline earth metals due to which it has two valance electrons in its outermost shell.
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2. What are the units for the mass of a solid? mass of a liquid?
Answer:
I'm not sure myself but I'd say mass since it's a solid
How many carbon atoms are there in 2.23 grams of propane (C3H8)?
Answer:
3.05x10²³ (3 sig. fig.)
Explanation:
Propane (C₃H₈) is a colorless alkane gas with three carbons and eight hydrogen atoms. In 2.23 grams of propane, there are 3.05 x 10²³ carbon atoms present.
What is the number of particles/atoms?
The number of atoms or the particles being the smallest units is estimated by the product of the number of moles and Avogadro's number.
The Avogadro's number (Na) is used to determine the number of particles that have been present in a mole of a substance. A mole of a substance is said to have 6.022 × 10²³ ions, atoms, electrons, molecules, etc.
Moles of propane are calculated as,
Moles = mass ÷ molar mass
= 2.23 ÷ 440.094
= 0.05057
Now, the number of particles is calculated as,
Number = moles × Avogadro's number
= 0.05057 × 6.022 × 10²³
= 3.05 x 10²³
Therefore, 3.05 x 10²³ carbon atoms are present in 2.23 grams of propane.
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When boiling a pot of water on the stove without a lid on the pot, the _____________. A energy and water molecules are free to escape into the surrounding environment. B molecules can escape out into the environment, but the energy are forced to stay in the system. C energy can escape out into the environment, but the molecules are forced to stay in the system. D both the energy and molecules are trapped in the system.
Answer:
A) Energy and Water molecules are free to escape into the surrounding environment.
Explanation:
Hello! This is the correct answer! (I took the K12 test)
I hope this helps! Have a blessed day! :)
When boiling a pot of water on the stove without a lid on the pot, the energy and water molecules are free to escape into the surrounding environment.
What is boiling?Boiling point of a substance is the temperature at which the substance changes from liquid state to gaseous state where these two systems comes in equilibrium.
Thus when a liquid is boiled, the liquid molecules get more energy to move apart and they escape into gaseous state. With change in state of the substance, the energy also be transferred from the liquid to the environment.
If the pot is closed with a lid, then both energy can be transferred but molecules get trapped inside. But here the pot is open and thus the gas molecules and energy are free to move outside.
Therefore, option A is correct for the boiling of water in an open pot.
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You are about to take a short trip. However, you will not be traveling by car or bus; instead you will be traveling up in a hot air balloon. You know that hot air balloons, like the ones pictured, are able to rise when the air contained in them is heated. Why does the balloon rise? What is happening at the molecular level to make the balloon rise?
Answer:
Hot air rises. Heated air molecules “spread out” or expand and bounce around, and the space becomes less dense than the surrounding space. Increasing the air temperature inside the balloon envelope makes it less dense than the air, thus making it “lighter than air”.
Explanation:
I'm new to brainly but I hope this helped!
Balloon rise because Warm air ascends. Heat causes the molecules of the air to "spread out," or expand, and bounce off one another, making the area less dense than the surroundings.
What are molecules ?
A molecule is the smallest unit of a substance that keeps its content and properties. It is made up of two or more atoms that are joined together by chemical bonds.
Chemistry is built on molecules. The element symbol and a subscript indicating the number of atoms are used to identify molecules.
When Balloon rise because Warm air ascends. Heat causes the molecules of the air to "spread out," or expand, and bounce off one another, making the area less dense than the surroundings.
The air inside the balloon's envelope becomes less dense as the temperature rises, making it "lighter than air."
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lonic bonding
10. If two atoms that differ in electronegativity combine by chemical reaction and
share electrons, the bond that joins them will be
(1 Point)
ionic bond
polar covalent
nonpolar covalent
a hydrogen bond
Answer:
polar covalent
Explanation:
If they do not equally share the electron then it is polar and covalent bonds share electrons
Which event is part of a convection current in the air?
A. Cool air sinks.
B. Cool air rises.
C. Warm air swirls.
D. Warm air sinks
Answer:
The answer is (Cool air sinks)
Explanation:
hope I help
The Cool air sinks are the part of a convection current in the air. Therefore, option A is correct.
What is convection current ?Convection currents are a type of natural heat transfer that involves the transfer of energy and heat from one location to another. We can use the sensation of heat when placing our hands over a campfire as an example of this. Convection currents are to blame for this.
Convection is a method of heat transfer in which gases or liquids are moved between areas of varying temperatures. Natural or free convection is the term used to describe convection that occurs naturally.
Convection currents move heat from one place to another by using the mass motion of a fluid, such as water, air, or molten rock. Convection currents' ability to transfer heat is what drives ocean currents, atmospheric weather, and geology.
Thus, option A is correct.
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Arrange the following metals in order of increasing reactivity Pb,Al, Sn,Q,Au,and Mg.
Answer:
Sn, Q,Au, Al,Pb
Explanation:
Because thats hw that works
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3.4 moles of CO to liters?
Answer:
76.2 L of [tex]CO_{2}[/tex]
Explanation:
Converting the unit of moles to liters is very easy if you know the value of a mole to a liter. Remember that 1 mole is equivalent to 22.413962 L.
Step 1:
3.4 mol [tex]CO_{2}[/tex] x 22.413962 [tex]\frac{liters}{mole}[/tex] = ?
Step 2:
Cancel out the moles.
Step 3:
If you multiply 3.4 by 22.413962, the answer is 76.2
Step 4:
Don't forget to put the units every time you answer. So the answer is: 76.2 L of [tex]CO_{2}[/tex]