Answer:
B. the smallest part of a substance that is still that substance with atoms chemically bonded together
Explanation:
Molecules are the small part of a substance with the atoms that are chemically bonded together. Hence, option (B) is the correct answer.
What is the meaning of length?
12579 nm rounded to 3 significant figures is
[tex]\\ \sf\longmapsto 12579nm[/tex]
[tex]\\ \sf\longmapsto 12579\times 10^{-9}m[/tex]
[tex]\\ \sf\longmapsto 1257.9\times 10^{-8}m[/tex]
[tex]\\ \sf\longmapsto 12.5\times 10^{-6}m[/tex]
[tex]\\ \sf\longmapsto 12.5\mu m[/tex]
Answer:
1.26e-5
Explanation:
Change 12579 nm to meters first, it becomes 1.2579e-5, then rounding it to 3 significant figures becomes 1.26e-5.
If you place a glass rod over a burning candle, the glass turns
black. What is happening to each of the following (physical
change, chemical change, both, or neither) as the candle burns?
Explain.
a. the wax
b. the wick
c. the glass rod
(i mainly just need the whether or not it is a chemical or physical, or both, change or not.)
If you place a glass rod over the burning candle, the glass turns black. The happening in the following substances are:
a. the wax is a both.
b. the wick is neither
c. the glass rod is a physical change.
What are chemical and physical reactions?Chemical reactions are those in which the substance changes its composition and totally transformed into a new substance. A chemical reaction involves reactants ad products.
Physical changes are temporary or permanent. Due to changes in the temperature or environment, some matter changes its shape and size.
Thus, the reactions are:
a. the wax is a both; Physical change-solid to liquid. Chemical change-burned to CO2 + H20 + heat + carbon as seen as black on the rod.
b. the wick is neither; the wick does not change, just provides a conduit for the wax to flame
c. the glass rod is a physical change; the carbon is only deported.
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mass=35g
density=5 g/cm3
what is the volume?
[tex]\large \mathfrak{Solution : }[/tex]
given values :
mass = 35 g
density = 5 g/cm³
we know that :
[tex] \boxed{density = \dfrac{mass}{volume} }[/tex][tex]5 = \dfrac{35}{vol} [/tex][tex]vol = \dfrac{35}{5} [/tex][tex]volume = 7 \: cm {}^{3} \: or \: 7 \: litres[/tex]Describe the process of making the four major macromolecules.
Answer:
Proteins, carbohydrates, nucleic acids, and lipids are the four major classes of biological macromolecules—large molecules necessary for life that are built from smaller organic molecules. Macromolecules are made up of single units known as monomers that are joined by covalent bonds to form larger polymers.
Explanation:
Have a great day!
Answer:, , nucleic acids, and lipids are the four major classes of biological macromolecules—large molecules necessary for life that are built from smaller organic molecules. Macromolecules are made up of single units known as monomers that are joined by covalent bonds to form larger polymers. I forgot to add carbohydrates and proteins also my bad
i just started learning aboit this too
Explanation:
helppppp I’ll brainlist
Answer:
Chloroplast
Explanation:
The chloroplast is the green Pigment in the skin that gives the leaf its color.
Why is titan a good name for Saturns largest moon?
Describes how likely an element is to form bonds with other elements.
Reactivity
Flamability
Dissolving
Melting
A sample of metal has a mass of 10.5 grams and a volume of 1.21 cm cubed. What is the density of the metal?
Answer:
[tex]\boxed {\boxed {\sf 8.68 \ g/cm^3}}[/tex]
Explanation:
The density of a substance is its mass per unit volume. The formula for calculating density is:
[tex]\rho= \frac{m}{v}[/tex]
The mass of the sample of metal is 10.5 grams. The volume of the sample of metal is 1.21 cubic centimeters.
m= 10.5 g v= 1.21 cm³Substitute these values into the formula.
[tex]\rho= \frac{ 10.5 \ g }{ 1.21 \ cm^3}[/tex]
Divide.
[tex]\rho= 8.67768595 \ g/cm^3[/tex]
The original measurements of mass and volume have 3 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place. The 7 in the thousandth place (8.67768595) tells us to round the 7 up to an 8.
[tex]\rho \approx 8.68 \ g/cm^3[/tex]
The density of the metal is approximately 8.68 grams per cubic centimeter.
The following data was collected for a runner's speed: 4mi/hr, 3mi/hr, 6.9mi/hr, and 7mi/hr. Is this data precise
The data collected is not precise.
In science, we define precision as the degree to which scientific measurements yield results having close range of values.
A precise data set has values that are very close to each other.
In this case the values; 4mi/hr, 3mi/hr, 6.9mi/hr, and 7mi/hr are not close to each other.
Therefore, the data set is not precise.
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1) Convert 300 cm3 to L
Answer:
300 Cubic Centimeters x 0.001 = 0.3 Liters
Answer:
Answer is 0.3 litre.
Explanation:
1 cm^3 = 1/1000 L
300 cm^3 = 300/1000 L
= 0.3 L answer.
an object is traveleing at a speed of 7.500.0 cm/sec. what is this value in km/day
Answer:
1 cm » 0.00001 km
1 sec » 1/86400 days
[tex]7500 {cm \: sec}^{ - 1} = \frac{75 00\: cm}{1 \: sec} \\ \\ = \frac{7500 \times 0.00001 \: km}{(1 \times \frac{1}{86400}) \: day } \\ \\ = { \boxed{ \boxed{6480 \: km \: {day}^{ - 1} }}}[/tex]
which is an example of a polymer?
A. Diamond
B. Cellulose
C. Sodium Chloride
D. Carbon Monoxide
Answer:
diamond
Explanation:
The diffrences between wood and stone
Wood:
Wood comes from trees, that are growing out of the ground, but not TECHNICALLY part of the earth.
Stone:
Stone is a part of the earth, created by a lot of minerals combining, and molten rock hardening a LOOOOOOONG time ago.
Which one of the give elements the least reactive?
A. Fluorine
B. Chlorine
C. Iodine
D. Bromine
Answer:
c
Explanation:
iodine is the answer.please mark me as brianlist.
Answer:
Fluorine
Explanation:
It is the most reactive
The only type of movement particles in a solid do is
Answer
:small vibrational movements.
Explanation:
The particles of a solid are not able to move out of their positions relative to one another, but do have small vibrational movements.
___________________________________________________________
-Darkspirit-
Each of the following can be used to make observations, except:
Help please it’s confusing to me
Answer:
B, H, E, G, C, D, A, F
Explanation:
The ones closest to the bottom are the oldest
> Ha
19. You have found a mysterious substance that appears to be radioactive. You take a sample to a nuclear chemist who
measures out 100 g. of the substance. Thirty hours later, the chemist tests the sample and finds that 6.25 grams of the
sample remains radioactive. What is the half-life of the sample?
> Nu
> Nu
Answer:
7.5 hours
Explanation:
half life is the a period of time the sample takes to be half the amount it started the period with
it means we can express it as
original amount / (2^n) = current amount
where n is the number of periods
in the problem if we put 100 / (2^n) = 6.25
we will find that n = 4
we divide 30 over 4 and we get that half life of each period will be equal to 7.5
6. Is there any way to predict when a specific piece of candy will land marked
side up or "decayed?" If you could follow the fate of an individual atom in a
sample of radioactive material, could you predict when it would decay?
Explain.
Answer:
No, each piece of candy has a 50% chance of decaying.No, just like the candy, each atom has a 50% chance of decaying each half-life.Explanation:
what property of wood would you need to know to predict how fast the wood would start to burn
Answer:
The chemical property of combustion.
Explanation:
Combustion is a chemical reaction that occurs between a combustible material, a substance that causes or favors the combustion of other substances that is oxidizer and oxygen, all this accompanied by outgoing energy in the form of heat (exothermic energy) and incandescent energy.
In this case, wood is the combustible material, and combustion is generated by separate energy, fire, phosphors, sparks.
Which one is NOT the name of a measurement system? (1 Point) International System of Units Metric System Spanish System British System
Spanish System is not the name of a measurement system.
WHAT IS A MEASUREMENT SYSTEM:
System of measurement refers to a collection of units of measurement and their corresponding rules. These systems are considered to be standard for measuring units. The system of measurements recognized are as follows:The international system of units (S.I units)The metric systemThe British imperial systemTherefore, the SPANISH system is not one of the measurement systems in use.
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negative
in your own words, why dose a car have
accelerction when it stops at a stop light?
Answer:
since it has lower mass. the force acting on it results in larger acceleration.
If you were to fill up a tub with water at the very highest that the water could go, and then sit inside the tub, do you think the water would sink due to your density upon the water, or would you submerge into the water (the water arises above you?)
Answer:
the water would rise above you and spill out
Explanation:
the water would form around you, because the human body is solid, and would take up some of the volume of the tub. the water then goes up due to the added volume.
What is the mass of a piece of silver that when dropped into a 100.0ml graduate cylinder cause the water level to rise from 12.65ml to 18.76 ml?
Answer:
dgdgdf
Explanation:
and yeah thatds it
PLS I NEED HELP
The distance from the Sun to Mercury is 3.598 • 10^7
miles. The distance from the Sun to Neptune is
2.798. 10^9 miles. How far is Mercury from Neptune?
Write your answer in scientific notation.
Answer:
4.44309 × 109 ( 4443090000 kilometres )
2.760936126 × 109 ( 2760936126 miles)
Please make me the brainliest! !!
Answer:
The distance of Mercury to Neptune = The distance from sun to Neptune - The distance from sun to Mercury
= 2.798 . 10^9 - 3.598 . 10^7
= 2.798 . 10^9 - 0.03598 . 10^9
= 10^9 ( 2.798 - 0.03598 )
= 2.76202 . 10^9 miles
.
.
Hope it helps
Thomson's model of the atom included negative
embedded in a ball of
Answer:
Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup."
Explanation:
I hope it helped
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A Cylinder has a diameter of 20 m and a height of 100 cm.
A. 12.56 m^3
B. 314 m^3
C 1256 m^3
D 2000 m^3
Answer:
d
Explanation:
cylinder has a diameter of 20 m and height of 100 cm is 2000mcube
Answer: 314 m^3
Explanation: V = πr²H
H = 1 meter (100cm = 1 meter)
R = 10 meters
V = (3.14)(10m)²(1m)
V = 314 m³
1. What is Science?
A. The goal of science is to investigate and understand the natural world, to explain events in the natural
world, and to use those explanations to make useful predictions.
Explain the term isotopes with two examples.
hi <3
isotopes have the same number of protons but different numbers of neutrons, and thus a different mass number.
chlorine has isotopes and so does hydrogen
hope this helps :)
Isotopes are atoms of same element having same atomic number but different mass numbers.
i.e because of different number of neutrons.
Example 1 : isotopes of Hydrogen
[tex] \mathrm{{_1 {}H }^{1} } - protium[/tex][tex] \mathrm{_1H }^{2} - deuterium[/tex][tex] \mathrm{_1H }^{3} - tritium[/tex]Example 2 : isotopes of Carbon
[tex] \mathrm{_{6} C {}^{12} }[/tex][tex]\mathrm{_{6} C {}^{13} }[/tex][tex]\mathrm{_{6} C {}^{14} }[/tex]I hope it helped...
