Answer:
When you heat ice, its temperature rises, but as soon as the ice starts to melt, the temperature stays constant until all the ice has melted. This happens because all the heat energy goes into breaking the bonds of the ice's crystal lattice structure.
Explanation:
Shards of ice fly from the sculptor’s chisel. As the crowd
looks on, a swan slowly emerges from a massive block of ice. As
the day wears on, however, drops of water begin to fall from the
sculpture. Drip by drip, the sculpture is transformed into a puddle of liquid water. What makes matter change from one state to
another? To answer this question, you need to think about the
particles that make up matter.
Energy Simply stated, energy is the ability to do work or cause
change. The energy of motion is called kinetic energy. Particles
within matter are in constant motion. The amount of motion of
these particles depends on the kinetic energy they possess. Particles
with more kinetic energy move faster and farther apart. Particles
with less energy move more slowly and stay closer together.
The total kinetic energy of all the particles in a sample of
matter is called thermal energy. Thermal energy, an extensive
property, depends on the number of particles in a substance as
well as the amount of energy each particle has. If either the
number of particles or the amount of energy in each particle
changes, the thermal energy of the sample changes. With identically sized samples, the warmer substance has the greater thermal energy. In Figure 7, the particles of hot water from the hot
spring have more thermal energy than the particles of snow on
the surrounding ground.
Coloumb's Law shows that opposite charges (positive and negative) attract
whereas charges that are both positive or both negative repel and a TRUE or FALSE
Answer:
True
Explanation:
It is true that coulomb's law states that opposite charges attracts and similar charges repel one another.
Charges are of two different types which are:
Positive charges
Negative charges
As a general rule, opposite charges attracts. For example, positive charges attracts negative charges at all times.
Similar charges will repel one another. For example, positive charges and positive charges repel also, negative and negative charges repel one another.
Therefore, opposite charges attracts and similar charges repel.
The element carbon continuously Cycles through an ecosystem. A simplified carbon cycle showing Step I, where organic molecules (carbohydrates) are created, and step II where CO2, Carbon dioxide, is produced, is depicted below.Identify the process in Step I and explain how it causes the movement of carbon.
Answer:
See the answer below
Explanation:
Organic molecules in the form of carbohydrates are created during photosynthesis or chemosynthesis and these processes cause carbon to be removed from the atmosphere or other environment into the biosphere - the living organisms of the ecosystem.
During photosynthesis, atmospheric carbon dioxide is fixed as carbohydrates into green plants in a two-stage process that requires sunlight energy and water. The entire process can be summarized as an equation below:
[tex]6CO_2 + 6H_2O + sunlight --> C_6H_1_2O_6 + 6O_2[/tex]
Instead of using water as a reactant, chemosynthetic organisms make use of high energy chemicals such as hydrogen sulfide to fix carbon dioxide in order to generate carbohydrates.
[tex]CO_2 + 4H_2S + O_2 -> CH_20 + 4S + 3H_2O[/tex]
Both processes ensure that carbon dioxide moves from the environment into living organisms.
The mass of an unidentified rock is 15.5 grams. Students determine the volume of the rock by placing the rock in a cylinder with water. What was the density of the rock that the students should have calculated?
Hint: The graduated cylinder measures volume. Read the difference in water level.
why is light important in astronomy?
Answer:
When stargazers go outside at night to look at the sky, they see the light from distant stars, planets, and galaxies. Light is crucial to astronomical discovery. Whether it's from stars or other bright objects, light is something astronomers use all the time. Human eyes "see" (technically, they "detect") visible light.
Answer:
Image result for why is light important in astronomy?
When stargazers go outside at night to look at the sky, they see the light from distant stars, planets, and galaxies. Light is crucial to astronomical discovery. Whether it's from stars or other bright objects, light is something astronomers use all the time. Human eyes "see" (technically, they "detect") visible light.
Explanation:
When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water
When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water
according to the reaction below.
2H2+ O2 + 2H2O
How many grams of oxygen were required?
2H, + O2 + 2H2O
How many grams of oxygen were required?
Mass of Oxygen required : 24 grams
Further explanationGiven
3 moles of H
1.5 moles of O
3 moles of H₂O
Required
Mass of O
Solution
Reaction
2H₂ + O₂ ⇒ 2H₂O
Mass of Oxygen for 1.5 moles of O :
= mol x Ar O
= 1.5 moles x 16 g/mol
= 24 grams
How many moles of carbon dioxide are produced when 23.0 g of C3H2O3 is burned during the
complete combustion of C3H2O3?
O 33.0 mol
O 0.250 mol
O 0.750 mol
O 3.00 mol
O 0.0833 mol
Moles of Carbon dioxide : 0.75
Further explanationGiven
23 g C₃H₈O₃
Required
Moles of Carbon dioxide
Solution
Reaction
2C₃H₈O₃ + 7O₂ → 6CO₂ + 8H₂O
mol C₃H₈O₃ :
= mass : MW
= 23 g : 92,09382 g/mol
= 0.24975
From the equation, mol ratio of C₃H₈O₃ : 3CO₂ = 1 : 3, so mol CO₂ :
= 3/1 x mol C₃H₈O₃
= 3/1 x 0.24975
= 0.74925≈0.750 mol
6. What is the lowest temperature on the Kelvin scale? What happens to matter when it
reaches this temperature?
Answer:
-273.15 degrees celsius
. Report the correct number of
significant figures.
a. 87.3 + 0.001 =
b. 0.201 + 0.92 =
c. 320 + 8.41 =
d. 1200 – 60 =
Answer:
[tex]87.3 + 0.001 = 87.301[/tex]
[tex]0.201 + 0.92 =1.121[/tex]
[tex]320 + 8.41 =328.41[/tex]
[tex]1200-60=1140[/tex]
Explanation:
Solving (a): 87.3 + 0.001 =
87.3 --> 3 significant figures
0.001 --> 1 significant figure
So, the answer must be in at least 3 significant figures
[tex]87.3 + 0.001 = 87.301[/tex]
Solving (b): 0.201 + 0.92 =
0.201 --> 3 significant figures
0.92 --> 2 significant figures
So, the answer must be in at least 3 significant figures
[tex]0.201 + 0.92 =1.121[/tex]
Solving (c): 320 + 8.41 =
320 --> 2 significant figures
8.41 --> 3 significant figures
So, the answer must be in at least 3 significant figures
[tex]320 + 8.41 =328.41[/tex]
Solving (d): 1200 – 60 =
1200 --> 2 significant figures
60 --> 1 significant figure
So, the answer must be in at least 2 significant figures
[tex]1200-60=1140[/tex]
Shown below is a table with plants and animals with their adaptations.
Using the description of plants and animals in the table above, which biome would all of these organisms would be best adapted to?
Answer:
Desert
Explanation:
The adaptation shown by the given plants and animals shows that they will adapted to the desert biome.
It is so because, due to high temperature of desert some desert animals like camel have the storage of fat in humps or tails; some animals have large ears such as Jackrabbits, it helps to release body heat and adapt in high temperature; plants have thick water holding tissues to reduce water loss in heat and waxy coating that keeps the plants cooler and reduce moisture loss.
Hence, the correct answer is "Desert".
Why do electrons repel each other?
Answer:
Electrons repel each other due to electrostatic force of attraction between both of them as a result prevent the electron from entering the nucleus preventing it from collapsing
Electrons repel each other because they have the same charge present in
them.
What is Law of Magnetism?Law of magnetism states that:
Like poles repelUnlike poles attract.Electrons are subatomic particles which are negatively charged which
depicts them possessing like poles.
This explains why electrons which are in contact with each other will repel as
a result of the repulsive force present in like poles.
Read more about Law of Magnetism here https://brainly.com/question/12529206
[Ar]4s1 what’s the element name?
Answer:
19
Explanation:
Here,
[Ar] = Argon = atomic no. = 18
4s1 = 1 electron
so 18 + 1 = 19
19 = Potassium (K)
Sodium metal is placed in water to produce sodium hydroxide (NaOH)
ions and hydrogen gas (H2).
Which substance in the chemical reaction is a solid?
a Sodium
b Water
C Sodium hydroxide ions
d Hydrogen vapor
Answer:
a Sodium
Explanation:
The solid in this reaction is the sodium metal. A solid is a substance held together by attractive forces that are very strong.
Solids have a fixed shape and volume.
Metals are solidsSodium is an alkali metal belonging to the first group on the periodic table. This solid combines with the liquid water. The product is an aqueous sodium hydroxide.Please help me understand how to...
Calculate the mass of Cr2O3 that can be produced if the reaction of 56.2 g of chromium and sufficient oxygen has a 76.0 % yield.
...Thank you!
Answer:
[tex]m_{Cr_2O_3}^{actual}=62.4gCr_2O_3[/tex]
Explanation:
Hello!
In this case, according to the reaction:
[tex]4Cr+3O_2\rightarrow 2Cr_2O_3[/tex]
We can see there is a 4:2 mole ratio between chromium and chromium (III) oxide, this, for the given 56.2 g of chromium, the theoretical yield of the oxide product is computed down below:
[tex]m_{Cr_2O_3}^{theoretical}=56.2gCr*\frac{1molCr}{52.0gCr}*\frac{2molCr_2O_3}{4molCr} *\frac{151.99gCr_2O_3}{1molCr_2O_3} =82.13gCr_2O_3[/tex]
Now, considering the 76.0-% yield for this reaction, the actual yield turns out:
[tex]m_{Cr_2O_3}^{actual}=82.13gCr_2O_3*\frac{76.0gCr_2O_3}{100gCr_2O_3} \\\\m_{Cr_2O_3}^{actual}=62.4gCr_2O_3[/tex]
Best regards!
3. Which subatomic particles account for most of an atom's mass?
4. Which subatomic particle accounts for most of an atom's volume?
3. Proton is the subatomic particle which accounts for most of an atom's mass.
4. Electrons are the subatomic particle which accounts for most of atoms volume.
For most of a cells life, chromosomes exist in a loose noodle like structure. Why do they become more compact?
Answer: For most of the life the chromosomes exists in a loose noodle like structure. They become compact to fit into a very small space.
Explanation: The chromosomes consists of a very long DNA that is linear. The liner DNA also has many proteins associated with it which is called as histone proteins.
These proteins fold and gets packed into a compact form from loose noodle or thread like structure.
This is necessary to get into a compact structure because being in linear form would require much space which is not possible. So as to manage the space and many processes like replication, repair and gene expression it is necessary for the chromosomes to get compact.
Fat and water in the sausage changed state
Answer:
Susie cooked sausages on a barbecue. (a) Fat and water in the sausages changed state. Draw one line from each statement to the correct change of state.
Explanation:
brailest/ crown please
What kind of intermolecular forces have the weakest attraction?
Answer:
This kind of interaction can be expected between any polar molecule and non-polar/symmetrical molecule. The induction-interaction force is far weaker than dipole–dipole interaction, but stronger than the London dispersion force.
Hope this is fine for youIron metal reacts with elemental oxygen to form rust according to the unbalanced reaction, Fe(s) + O2(g) → Fe2O3(s),. What is the coefficient of the iron(III) oxide, Fe2O3(s), in the balanced reaction?
a
1
b
2
c
3
d
4
Time left for this assessment:
50:27
Answer:
c. 3
Explanation:
The unbalanced reaction expression is given as:
Fe + O₂ → Fe₂O₃
To balance the expression gives the coefficient of oxygen.
Assign the coefficients a,b, c and use a mathematical approach to solve this problem:
aFe + bO₂ → cFe₂O₃
Conserving Fe: a = 2c
O: 2b = 3c
Now let c = 1, a = 2, b = [tex]\frac{3}{2}[/tex]
Multiply through by 2,
a = 4, b = 3 and c = 2
4Fe + 3O₂ → 2Fe₂O₃
The coefficient of O₂ is 3
Please help!! Need to know what it is!
Answer:
The correct answer will be 15
Answer:
15Explanation:
it is fifteen. 15 heheheehehehhehehehehehheheheHow much voltage is needed to get 3 amps to flow through a resistance of 6ohms
Answer:
18 Volt
Explanation:
Step 1: Given data
Intensity of the current (I): 3 AmpereResistance (R): 6 OhmRequired voltage (V): ?Step 2: Calculate the required voltage
We have a continous current flowing through a resistance. We can calculate the required voltage using Ohm's law.
I = V/R
V = I × R
V = 3 A × 6 Ω = 18 V
What is a mole in chemistry terms?
a mammal found in Eurasia and North America
an IS unit for measuring the amount of a substance
a benign tumor sometimes found on human skin appearing as a small, sometimes raised area of skin, usually with darker pigment
a Mexican sauce made from chili peppers, other spices and chocolate
Answer:
the IS unit for measuring the amount of a substance
Explanation:
that's what it is
1. Compound description ionic or molecular? 1 Compound 1 is a hard white smooth odorless solid, which is insoluble in water. If the flame from an ordinary laboratory burner is held on the solid for 10 minutes, the solid grows hot to the touch but does not soften. ionic molecular (can't decide)
2 Compound 2 is a hard light gray solid made up of clusters of cube-shaped crystals. It can easily be ground into a fine powder. If that powder is compressed to form a block, the block is an insulator. However, if the block is moistened slightly, it starts to conduct electricity much better. ionic molecular (can't decide)
3 Compound 3 is a clear liquid with a strong pleasantly fruity smell. If cooled it freezes at about −10°C. In the solid state it does not conduct electricity. ionic molecular (can't decide)
Answer:
Compound 1 - Can't decide
Compound 2 - Can't decide
Compound 3 - molecular
Explanation:
The solid that has been designated as compound 1 is difficult to really classify because, we can see that the solid only became hot when heated but does not soften. This can be an attribute of an ionic solid. However, the same solid is not soluble in water. This insolubility in water is a property of molecular solids. As a result of these, we will find it difficult to classify the solid.
Compound 2 is also difficult to decide upon because ionic solids are crystalline and can not be ground into powder. Amorphous substances can be ground into powder easily. Then, we can see that the substance does not conduct electricity in block form but does so when moistened. This means that we can not conveniently classify it as a molecular solid since molecular substances do not conduct electricity.
A molecular substance usually has a low melting and freezing point and also does not conduct electricity hence compound 3 is molecular solid.
Please help!! What is this
Answer: It's a redox reaction
Explanation:
Along the length of the DNA strand, information is stored in the sequence of __________.
PLEASE HELP! DUE IN 5 MINS!!
CHEMISTRY
True or false: lone pairs of electrons around the central atom do not influence the shape
of the molecule.
Answer:
False
Explanation:
How can you minimize a collision summary
One of the ways to minimize a collision is to slow down: When you can't find an escape and you're definitely going to collide with something, you should slow your vehicle down as much as possible.
Hope this helps ^^
Calculate the pH of a buffer solution containing 0.1 M of ethanoic acid (CH3COOH) and 0.02 M Magnesium ethanoate (NB make sure you have the correct formula for the salt and therefore CH3COO-ions ). The Ka for ethanoic acid is 1.74 x 10-5 mol dm-3.
Answer:
By the end of this module, you will be able to: ... (a) Calculate the pH of an acetate buffer that is a mixture with 0.10 M acetic acid and 0.10 M ...
What is the definition of silicon minerals
Which of these is a physical property?
Group of answer choices
ability to burn
weight
ability to tarnish
ability to rust
Given 2Na + 2H2O → 2NaOH + H2, how many grams of oxygen are produced if 300.00 grams of Na are reacted with water?
First you have to find the number of moles , then you have to apply stoichometry to find the number of moles of H2 gas , after that you can determine its mass.
