Answer:
B hope this helps
Explanation:
The density of a substance describes how closely its molecules are packed. Despite the fact that ice is a solid form, an ice cube contains many pores in and the molecules are more spread in the state than that in liquid state of water.
What is density?Density of a substance is the measure of its mass per unit volume. It describes how closely packed its molecules within a given volume. If the molecules have enough space to spread they will be less dense.
The objects which are less dense than water will float in it. Whereas which are having more density will sink on it. Ice floats on water because, ice is less dense than water.
An ice cube has a pore structure and one ice cube contains fewer water molecules and which are spread through the porous structure. Therefore, water in liquid state is more dense than ice.
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Help Will give brainlyest
Answer: deposition
extra words lol
The density of pure water is 1 kg/L. After you calculated the density of material, how would you know if the object would sink or float without placing it in water?
Explanation:
After calculating the density of the material we can tell if the object will sink or float without placing it in water by comparing their density.
The density of water is given as 1kg/L If the density of the material is greater than the density of water, the material will sink. If the density of the material is less than the density of the water, it will float.This way, comparing the density values of both substances can tell us whether they will float or sink.
Between room temperature and its melting point (1132C), pure U metal exists in three crystal phases: alpha, beta, and gamma. Transformation from alpha to beta occurs at 668C and from beta to gamma at 775C. Calculate theoretical density (g/cm3) for all three phases.
Neec help please :)
. H ow many milliliters of water must be added to 250 mL of a 25% w/v stock solu- tion of sodium chloride to prepare a 0.9% w/v sodium chloride solution
We have that for the Question it can be said that the volume of water must be added to 250 mL of a 25% w/v stock solution of sodium chloride to prepare a 0.9% w/v sodium chloride solution is
x=444ml
From the question we are told
. H ow many milliliters of water must be added to 250 mL of a 25% w/v stock solution of sodium chloride to prepare a 0.9% w/v sodium chloride solution
Generally the equation for the volume of NaCl is mathematically given as
[tex]V=\frac{25}{100}*250\\\\V=62.5ml[/tex]
Therefore
[tex]\frac{62.5}{250+x}*100=0.9\\\\x=6250-2250\\\\x=4000ml\\\\x=444ml[/tex]
Therefore
the volume of water must be added to 250 mL of a 25% w/v stock solu- tion of sodium chloride to prepare a 0.9% w/v sodium chloride solution is
x=444ml
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Microscale glassware kits include connectors to fit the smaller glassware. The black connectors should be used when _________ are present. Otherwise, the tan connectors can be used. The connectors can combine different pieces of glassware or components_______
Answer:
high boiling aromatics
with the same ground glass joint.
Explanation:
The black connectors are more resistant to the reactant than the white connectors. This implies that the black connectors should be used when high boiling aromatics are present, Else, the tan connections can be used.
Thus, the connectors can combine different pieces of glassware or components with the same ground glass joint.
If NaCl has a mass of 3.2g, what is the volume of chlorine gas at STP?
Hey there!
Molar mass NaCl = 58.44 g/mol
58.44 g ----------------- 22.4 ( at STP )
3.2 g -------------------- Volume ??
Volume = ( 3.2 x 22.4 ) / 58.44
Volume = 71.68 / 58.44
Volume = 1.226 L
Hope this helps!
Answer:
V = 0.56 L
Explanation:
Given data:
Mass of NaCl = 3.2 g
Volume of chlorine gas = ?
Pressure and temperature = standard
Solution:
Chemical equation:
2NaCl → 2Na + Cl₂
Number of moles of NaCl:
Number of moles = mass/molar mass
Number of moles = 3.2 g/ 58.44 g/mol
Number of moles = 0.05 mol
Now we will compare the moles of NaCl with chlorine;
NaCl : Cl₂
2 : 1
0.05 : 1/2×0.05 = 0.025 mol
Volume of chlorine:
PV = nRT
V = nRT/P
V = 0.025 mol × 0.0821 atm.L/mol.K × 273 K / 1 atm
V = 0.56 L
Please show all work for full credit.
1. (6 pts) A photon has a wavelength of 325 nm. Does the photon have sufficient energy to
break a N=N bond that has a bond energy of 418 kJ/mol.
Answer:
No, it is not sufficient
Please find the workings below
Explanation:
Using E = hf
Where;
E = energy of a photon (J)
h = Planck's constant (6.626 × 10^-34 J/s)
f = frequency
However, λ = v/f
f = v/λ
Where; λ = wavelength of light = 325nm = 325 × 10^-9m
v = speed of light (3 × 10^8 m/s)
Hence, E = hv/λ
E = 6.626 × 10^-34 × 3 × 10^8 ÷ 325 × 10^-9
E = 19.878 × 10^-26 ÷ 325 × 10^-9
E = 19.878/325 × 10^ (-26+9)
E = 0.061 × 10^-17
E = 6.1 × 10^-19J
Next, we work out the energy required to dissociate 1 mole of N=N. Since the bond energy is 418 kJ/mol.
E = 418 × 10³ ÷ 6.022 × 10^23
E = 69.412 × 10^(3-23)
E = 69.412 × 10^-20
E = 6.9412 × 10^-19J
6.9412 × 10^-19J is required to break one mole of N=N bond.
Based on the workings above, the photon, which has an energy of 6.1 × 10^-19J is not sufficient to break a N=N bond that has an energy of 6.9412 × 10^-19J
how much mass is lost through radioactive decay if 1.8 x 10^15 J are released?
Answer:
0.02 kg
Explanation:
A P E X
The energy released by the decay process is 1.8 x 10¹⁵ J. Therefore the mass of the radioactive substance is 0.02 Kg.
What is radioactive decay ?Heavy unstable radioactive nuclei undergoes nuclear decay by the emission of charged particles to form more stable nuclei.
The relationship between energy and mass is given by Einstein's famous equation, E = mc², where E is the energy released in a process, m is the mass lost or gained in the process, and c is the speed of light.
To calculate the mass lost through radioactive decay, we need to rearrange this equation to solve for m:
m = E / c²
Plugging in the given energy released, E = 1.8 x 10^15 J, and the speed of light, c = 3 × 10⁸m/s, we get:
m = (1.8 x 10¹⁵ J) / ( 3 × 10⁸ m/s)²
m = 1.8 x 10¹⁵ J /9 x 10^16 m²/s²
m =0.02 kg
Therefore, the mass lost through radioactive decay is approximately 0.02 kg.
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can you please help me with this question
Answer:
Heat the water i'm pretty sure
Explanation:
A change from one state (solid or liquid or gas) to another without a change in chemical composition is called what.
Answer:
Physical Change. A change of matter from one form to another without a change in chemical properties. Chemical Change. A change that occurs when one or more substances change into entirely new substances with different properties.
Explanation:
plz help plzzzzzzzzzzzzzzz
Answer: C.
Explanation: Please mark Brainlest Pleasee
Which statement best explains what will happen to the soil erosion in the area that was burned by the wildfire?
Answer:
Soil erosion will increase because there are fewer plants to stabilize the soil.
Explanation:
study island
What volume (L) will 3.56 mol NH3 occupy at STP. (1 point)
A 0.159 L NH3
B 79.7 L NH3
C 157 L NH3
D 0.0809 L NH3
Answer:
B
Explanation:
I hope it helps you good luck
Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
11.65498 + 156.325 = [?]
Answer:
167.980.
Explanation:
Hello!
In this case, since additions involving the display of the result with the appropriate number of significant figures involve the solution of the system without looking at them:
[tex]156.325 +11.65498 =167.97998[/tex]
Considering that 156.325 is significant to the thousandths and 11.65498 to the hundred thousandths, we infer that the result should be taken to the thousandths as well as 156.325; thus, we obtain:
[tex]167.980[/tex]
Because the second decimal nine is rounded to ten and therefore the 7 is taken to 8.
Best regards!
how many atoms are there in 0.075 mol of titanium
Answer:
There are 6.022x10^23
Explanation:
plzz put me as brainest
What part of the leaf is responsible for absorbing the sun’s energy?
Answer:chlorophyll
Explanation:
The part of leaves that is responsible for absorbing sun's energy is chloroplast.
What is chloroplast?A chloroplast is an organelle found within the cells of plants and certain algae that is responsible for photosynthesis, which is the process by which solar energy is converted into chemical energy for growth.
Small organelles called chloroplasts are found inside plant cells and store sunlight energy.
The chloroplast's thylakoid membranes contain a light-absorbing pigment called chlorophyll, which is responsible for the plant's green color.
They are in charge of photosynthesis, which is the process of converting light energy into sugar and other organic molecules that plants and algae use as food.
They also produce amino acids and lipids, which are required for the production of chloroplast membranes.
Thus, the chloroplast is the part that traps the energy of the Sun.
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N
0/2 points
Imagine: There are at least a few atoms that now make up you, that USED to make up one of the
dinosaurs that lived 65 million years ago! Explain how this could be using the idea that elements were
originally created in the heat and explosion of stars.
Answer:
These people painted mostly animals that they most likely hunted as a major source of food, and in doing so left behind evidence of their activities i think
Explanation:
Please help me ASAP I’ll mark Brainly
Answer:
Batteries hold chemical energy
Explanation:
The battery acid in a battery leads to chemical energy.
How does a meteorologist use an understanding of what causes weather to predict a storm?
A person plugs a power cord into an electrical outlet in the wall. The power cord is covered in black rubber .Which statement is an accurate description of the materials?
Electrons would easily move through the person if there was no rubber around the wire
Electrons would not move through the wire if there was no rubber around the wire
Electrons easily move through the rubber around the wire
Electrons move through air when the cord is a few inches from the outlet
Answer:
A
Explanation: The rubber around the wire is an insulator, and the wire i would imagine would be made out of something like copper. Electricity runs through everything and without the insulator there, you'd be touching metal that electricity is running through.
Why are atoms electrically neutral if they contain charged particles?
Answer:
Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).
Explanation:
could someone please help me out??
Which of the following is not true about proteins?
A.) Proteins are found in hemoglobin and in the keration of skin.
B.) Proteins are made up of long chain amino acids
C.) Polypeptides are formed by 10 or mode amino acids
D.) Common amino acids are adenine and guanine
Answer:
(I'm not sure tbh) It's C Polypeptides are formed by 10 or more amino acids
Select the correct answer.
Which characteristic is a property of water?
Answer: A. It is made of polar molecules.
Explanation:
A polar molecule refers to a molecule that has a covalent bond but has an uneven distribution of electrons due to an atom in the molecule having strong electronegativity which will attract more of the electrons from the other atom.
Water is such a molecule because Oxygen has strong electronegativity which leads to electrons being pulled to it.
Answer:
e
Explanation:
How many grams of sodium carbonate, Na2CO3, are needed to add to 0.125 kg of water to make a 0.200 m (molal) solution
Answer:
Mass = 2.65 g
Explanation:
Given data:
Mass of sodium carbonate = ?
Mass of water = 0.125 g
Molality = 0.200 m
Solution:
Formula:
Molality = number of moles of solute / mass of solvent in Kg
by putting values,
0.200 m = Number of moles of solute / 0.125 kg
Number of moles = 0.200 m × 0.125 kg
Number of moles = 0.025 mol
Mass of sodium carbonate:
Mass = number of moles × molar mass
Mass = 0.025 mol × 106 g/mol
Mass = 2.65 g
i don’t really know anything about this so i need help
Answer:
D. a new substance is formed.
Explanation: "Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance." B. and C. are two different effects of chemical reaction, but not for all. Hope this helps ^-^.
answer this I hope you can see it
Answer:
Explanation:
Dry I can't c it
Caffeine, a stimulant in coffee and some cola drinks, is 49.47% carbon, 5.19% H, 28.8% N, 16.48% O. What is the mass of carbon contained in 37.1 g of
caffeine?
a. 36.8 g
b. 1840 g
c. 24.39 g
d. 18.49 g
e.6.11 g
Answer:
18.4g
Explanation:
Given parameters:
Percentage composition:
49.47% carbon
5.19% H
28.8% N
16.48% O
Mass of caffeine = 37.1g
Unknown:
Mass of carbon = ?
Solution:
To find the mass of the carbon:
Mass of carbon = percentage composition of carbon x mass of caffeine
Mass of carbon = 49.47% x 37.1 = 18.4g
In a lab, you produce a quantity of the radioactive isotope thorium-234. Over the course of several weeks, the unstable isotope decays, and you measure the amount of thorium-234 remaining in the sample. You obtain the following data. What is the half life of Thorium-234? How much Thorium 234 will there be after two half lives?
Days Elapsed Grams of Thorium 234 Remaining
0 16
12 11
24 8
36 6
a. 36 days
b. 12 days
c. 24 days / 4 grams
Answer:
Option C. 24 days / 4 grams
Explanation:
From the question given above, the following data were obtained:
Days Elapsed >>>> Mass Remaining
0 >>>>>>>>>>>>>>> 16
12 >>>>>>>>>>>>>>> 11
24 >>>>>>>>>>>>>>> 8
36 >>>>>>>>>>>>>>> 6
A. Determination of the half-life of Thorium-234.
To determine the half-life, it is important to know the definition of half life.
Half-life is defined as the time taken for a substance to reduce to half its original mass.
From the table given above, we can see that the original mass of the isotope is 16 g (i.e at 0 day). By day 24, the mass of the isotope is 8 g (i.e half the original mass). Thus, the half-life of the isotope is 24 days.
B. Determination of the mass of the isotope remaining after 2 half lives.
Original amount (N₀) = 16 g
Number of half-lives (n) = 2
Amount remaining (N) =?
N = 1/2ⁿ × N₀
N = 1/2² × 16
N = 1/4 × 16
N = 4 g
Thus, 4 g of the isotope is remaining after 2 half lives.
Summay:
Half-life = 24 days
Amount remaining after 2 half-lives = 4 g
Option C gives the correct answer to the question.
Question 1 of 10
Where is a tomado most likely to form?
O A. Where warm, moist air masses traveling north collide with cool,
dry air masses traveling south
O B. On the northwestern side of a low-pressure system
C. Where a high-pressure system is lingering over an area
OD Over warm, tropical ocean water
SUBMIT
Answer:
A Where warm, moist air masses traveling north collide with cool,
dry air masses traveling south
