Answer: ice is less dense than liquid water. If ice was more dense, Earth would freeze.
Explanation: There are many reasons why life on Earth depends on the characteristics of water. One could discuss hydrogen bonds and its role as a solvent, but the unusual property of water is is the change in density with change in temperature. Water is densest at 4 degC, which is why ice floats - it is less dense than cold water (it melts quickly in warm water, so density isn’t impotant at higher temperatures). Most liquids are less dense than the solid, frozen form. If this was the case with water, any ice that formed would sink, and sease would freeze from the bottom up. Furthermore, the lowest layers would be insulated and would not all melt in summer. Thus over time, the seas would become a thin layer of liquid water at best, over solid ice. Life could not develop without liquid seas. In addition, ice is reflective, reducing the amount of sunlight absorbed, further reducing temperatures. Without ocean circulation, polar areas would be even colder, and there would be no rain.
why are cell wall chloroplast and vacuole found in plant cell only while centriole is for animal cell only?
Answer:
The cell wall and chloroplasts are essential for autotrophic processes, basically allowing plant life to thrive off of self-made nutrients/food. This is why they are only in plant cells.
Centriole:Anatomically, animal cells have them and plant cells don't have them. Centrioles direct the movement of chromosomes during cell division, but plant cells don't need this since they use photosynthesis.
Explanation:
(Please explain the answer. Thank you!)
A chemist needs 2.00 g of a liquid compound, which has a density of 0.718 g/mL. If the
compound costs $5.67 per mL, how much will a 2.00 gram sample cost?
Sample cost = $15.796
Further explanationGiven
Mass = 2 g
Density = 0.718 g/ml
Cost = $5.67 per mL
Required
Cost
Solution
The density : the ratio of mass and volume
Can be formulated :
Density (ρ) = m : V
The volume of the liquid :
V = m : ρ
V = 2 g : 0.718 g/ml
V = 2.786 ml
Sample cost :
= 2.786 ml x $5.67/ml
= $15.796
please fast!!!!!!!!!!!!!!!!!!!!!!
Answer:
1 g/mL.
Explanation:
From the question given above, the following data were obtained:
Volume = 100 mL
Mass = 100 g
Density =?
Density of a substance is simply defined as the mass of the substance per unit volume of the substance. The density can be expressed mathematically as:
Density (D) = mass (m) / volume (V)
D = m / V
With the above formula, we can obtain the density of the liquid as follow:
Volume (V) = 100 mL
Mass (m) = 100 g
Density (D) =?
D = m / V
D = 100 / 100
D = 1 g/mL
Thus, the density of the liquid is 1 g/mL
Which of the following is the metallic ion in sodium fluoride? 1. Na 1- 2. Na1 + 3. F 2- 4. F 2+
Answer:
2. Na1 +
Explanation:
The formular for sodium fluoride is; NaF
The metal in sodium flouride is sodium.
Sodium belongs to group 1, hence would lose one electron when forming ions.
This is represented as;
Na+
Which set of reagents will best convert 2,2-dimethylpropan-1-ol (neopentyl alcohol) to 4,4-dimethylpentan-2-ol
Answer:
SOCl2, Mg, CH3CHO, H3O^+
Explanation:
The reaction of the 2,2-dimethylpropan-1-ol with SOCl2 converts the alcohol to an alkyl halide. This now reacts with Mg metal to yield a Grignard reagent.
The Grignard reagent reacts with CH3CHO and acid to yield 4,4-dimethylpentan-2-ol as shown in the image attached to this answer.
Why is the time series useful as a management tool?
A) It estimates the probability of extinction.
B) It estimates the harvested numbers.
C) lt monitors a population's age structure.
D) It designates wildlife refuge areas.
Answer:
A)
Explanation:
It estimates the probability of extinction.
Which of the following is not a natural change to the envlronment? drought , flood, disease ranching
Answer:
Disease ranching
Explanation:
Floods and Droughts are caused by the enviorment. Diseases are but a product and don't affect the enviorment.
Answer:
disease ranching is not a natural change to the environment .
Explanation:
This all happen because of human activities
Many organisms on Earth exhibit similar ____________.
Question 1 options:
time
single-celled
characteristics
nonliving
Answer:
Characteristics
Explanation:
hope this helps
Tonic bonding is the result of electron transfer.
Lose electrons and become positive ions. While,
Gain electrons and become negative ions.
gain
Write your two answers with a comma between them like: dogs, cats.
Answer:
metals, non-metals
Explanation:
Ionic bonding results from electron transfer. To form this bond type, metals lose electrons and becomes positive ions. While non-metals gain electrons to become negatively charged.
Ionic bond forms between a very less electronegative substance and one with with a higher one. The two ions formed attracts one another with an electrostatic force. This electrostatic force is the ionic bonding that holds the atoms together.Calculate the number of moles of iron that are contained in 2.89x10^ 25 atoms of iron
What is conclusive evidence that mixing sugar in water is a physical change
Explanation:
1) their is no formation of new substance
2) the reaction can be reverse i.e if we heat sugar solution it we give us sugar and water.
I need help as fast as possible
how many grams og gas must be relased from a 45.2 L sample of N2 at STP to reduce the volume to 45.0 L at stop
Answer:54,6
Explanation:
Answer:
yes it is 54,6
Explanation:
54,6 you ar correct you did a graet job
This image of a baby was produced using ultrasound.
Which option is the best model of how the image was made?
O An X-Ray
O An echo
O A convex lens
O A turbine
Answer:
im pretty sure its "An echo"
Explanation:
Answer: An echo
Explanation:
it's very much correct
Over long periods of time, a series of processes continuously change rocks from one type into another. This is called the rock cycle. A combination of subsurface and surface processes are responsible for the recycling of rocks in the geosphere.(that was the story)
What two processes are responsible for changing metamorphic and igneous rock into sedimentary rock?(this is the question)
A) intrusive and extrusive
B) weathering and erosion
C) subduction and sea floor spreading
D) heat and pressure
Answer:
B) weathering and erosion
Explanation:
The two processes responsible for changing metamorphic and igneous rocks into sedimentary rocks is weathering and erosion.
Weathering is the defined as the physical disintegration and chemical decomposition of rocks to form sediments and soils.
Erosion is the removal of weathered materials from the surface of the earth.
The process of erosion and weathering serves to convert igneous and metamorphic rocks into sediments by which a sedimentary rock is formed.
Answer: The rock cycle
Explanation: Well its kinda obious that it is the rock cycle because the question says it changes countinuously to other rocks so yeah rock cycle is answer to question.
Which of the following is true of ionic bonds?
Moving electrons become delocalized between the atoms creating the
ionic bond
Electrostatic attraction results in the arrangement of charged atoms in a
regular, geometric structure called a crystal lattice.
Transferring of valence electrons creates the bond
The bond is created by oppositely charged metal and nonmetal atoms
Sharing Valence electrons between nonmetal atoms creates the bond
Answer:
D: The bond is created by oppositely charged metal and nonmetal atoms.
Explanation:
An ionic metal basically involves a metal and a nonmetal in bonding. A metal is a cation with a + charge and a nonmetal is a anion with a - charge. I will give you an example. Magnesium Chloride is a ionic bond. This is because Magnesium is a metal with a +2 charge(so it is a cation). Chloride or Chlorine is a nonmetal because it has a -1 charge.(so it is a anion). The chemical formula for magnesium chloride is MgCl2.
Hope my answer helped! Have a great day.
What is the name of the compound with formula P3O10?
Answer:
The compound of the formula is Sodium triphosphate.
Explanation:
How do you draw a branched carbon chain for trimethylbutane?
Answer:
I think this is how you draw it, but I'm not entirely sure.
Explanation:
Screenshot below:
An empty Erlenmeyer flask weights 241.3 g. When filled with water (d = 1.00 g cmଷ ⁄ ), the flask and its contents weight 489.1 g. What is the flask’s volume? What is the mass of the flask when filled with chloroform (d = 1.48 g cmଷ ⁄ )?
Answer:
608 g
Explanation:
Mass of flask + contents = 489.1 g
Mass of flask = 241.3 g.
Mass of water = 489.1 - 241.3 = 247.8 g
Density of water = 1.0 g/cm^3
volume of water = 247.8 g/1.0 g/cm^3
Volume = 247.8 cm^3
But
Volume of flask = volume of water
Volume of flask = 247.8 cm^3
volume of chloroform = volume of flask
mass of chloroform = 1.48 g/cm^3× 247.8 cm^3
Mass of flask + chloroform = 366.7 g + 241.3 = 608 g
8. Water behind a dam, a moving car, and electricity moving in a circuit all are examples of
energy because they
a. Help accomplish a job
b. Can cause change
C. Are expensive to create
d. Come from fossil fuels
Answer:
a. Help accomplish a job
Explanation:
Energy is defined as the ability to do work. It is the ability to get a job done.
Where energy is deficient, no job or work can be done.
In a water behind a dam, potential energy is stored. Potential energy is due to the position of a body. A moving car has kinetic energy which the energy due the motion of a body. Electrical energy is used to carry the currents in a circuit round about.Which atorn was used to determine the amount of particles in a mole?
Answer:
carbon atom is used to determine the amt of particles in a mole
26. A pathogen is any organism that causes a disease. Which of the following is an example of a pathogen that
infects humans?
A.parasite
B.plasmid
C.plant cell
D.plasma membrane
Answer:
A.parasite
Explanation:
The strongest spring tide occurs when?
Answer:
the sun and moon are aligned with the earth.
Answer:
uhhh first or third quarter
Explanation:
0.446 g of hydrogen gas fills a 5.0 L bag determine the density of hydrogen
The density of hydrogen : ρ = 0.0892 g/L
Further explanationGiven
mass of Hydrogen : 0.446 g
Volume = 5 L
Required
The density
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
The unit of density can be expressed in g/cm³, kg/m³, or g/L
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
Input the value :
ρ = m : V
ρ = 0.446 g : 5 L
ρ = 0.0892 g/L
How many molecules are in 38.4 moles of NF3?
Answer:3
Explanation:
I added and substituted for the garlic
The chemical formula for methanol is: Calculate the molar mass of methanol. Round your answer to decimal places.
Answer:
CH3OH (Methanol)MM = 12 + 8 + 16 = 36u
3. Why do you think the image of the pencil inside the beaker of water is different than the pencil
inside the empty beaker?
I’m going to give brainlest to who answers does tree questions
Answer:
the water.
Explanation:
well the water makes things look larger than due to ( the surface of a water drop curves outwards to make a dome. this outward or convex, curature light rays inward. the result is an enlarge ment image on the eye. / makes it look larger) + more mass.
Please help me thanks so much....I’ll mark you?!?!:)))) ( 15 points)
Answer:
all of the above
Explanation:
For all seawater problems, assume the salinity is 3.5%
If you have a 2000 gram sample of seawater, how many grams of pure water are there?
0.035 x 2000) = x, 2000 - x = pure water
Answer to the nearest WHOLE number.
Answer:
1930g
Explanation:
We have been given that the salinity of sea water is 3.5%;
Now the mass of sea water sample is 2000g
So, problem here is to find the quantity of pure water in the sample = ?
Solution:
Let us find the quantity of the salt in the sample;
Salt content = 3.5% x 2000 = 70g
Amount of pure water = 2000 - 70 = 1930g
PLEASE HELP! Due in 1 minute chemistry lewis structure.
Am i correct?