A candle weighs 25 grams before burning. After burning for 10 minutes, the candle now weighs 17 grams. Using the Law of Conservation, explain how this is possible.
Explanation:
These are some unaccounted mass that was involved.
According to the law of conservation "matter is neither created nor destroyed but can be combined with one another".
The rule applies to all substances with no exception When burning a candle, a phase change process is going on. Some candle part of the candle occur in molten form whereas the other part is a solid. In this experiment, the molten wax was not taken into consideration. This accounted for the mass deficit.The periodic table is organized into vertical groups of
A
elements with similar properties.
B
comporlds with different properties.
с C
elements with all the same chemical properties.
compounds with all different physical properties.
How many grams are equal to 3.46 moles of iodine
?
875.38 g are equal to 3.46 moles of iodine.
What is moles?The mole is the SI basic unit of substance quantity, with the sign mol. The amount of substance in an object or sample is defined as the number of elementary entities of that substance.
It is given that n = 3.46, molar mass of iodine = 253 g/mol.
Moles can be expressed as:
Moles = mass /molar mass
3.46 mol= mass / 253 g/mol.
mass = 253 g/mol ×3.46 mol
mass = 875.38 g.
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Answer:
see the pic for the answer
Based on this chemical equation KNO3 --> KNO2 + O2
Please identify the kind of chemical reaction represented
A Synthesis
B Decomposition
Single Replacement
D Double Replacement
E) Combustion
HURRY PLEASE THIS NEEDS TO BE TURNED IN BY 4:00pm
What is the equation to determine the MA of a wedge?
MA= length - width
MA= Length+ width
MA= Length * width
MA= Length/ wisth
Answer:
length/width
Explanation:
Answer:
Length/Width
Explanation:
I did the module 10 exam so I know it is length/width
There are ______ moles in 3.73 x 1023 formula units of barium chloride.
Answer:
0.62 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L}\\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.73 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.73}{6.02} \\ = 0.619601...[/tex]
We have the final answer as
0.62 molesHope this helps you
Need help ASAP... The diagram shows a box in the periodic table.. what is the atomic number of the element??
insertion mutation definition ?
Answer:
Insertion is a type of mutation involving the addition of genetic material. An insertion mutation can be small, involving a single extra DNA base pair, or large, involving a piece of a chromosome.
Explanation:
insertion is some sort of mutation that records the addition of genetic material
An unknown occupies a volume of 5 ml and Has a mass of 40 grams what is its density
Answer:
8 g mL
Explanation:
TRUST ME
A sixth grade teacher takes students on a field trip to the beach. One student finds several pebbles that have a rounded shape and are smooth to the touch. What process most likely shaped these pebbles?
Answer:
the one you have selected is correct
Explanation:
Answer:
The shape of the pebbles is a result of weathering and deposition.
Explanation:
Which compounds have carbon-carbon double bonds?
Answer:
Aikens/hydrocarbons
Explanation:
because the formula of this is Cn H²n
According to the big bang theory, which statement is accurate about how the universe came to be?
It expanded slowly.
It gradually warmed.
Stars and galaxies formed.
Atoms such as hydrogen were destroyed
Answer:
The term Big Bang defines that the Universe has expanded from the ancient hot and thick primary situation at some fixed time in the past.
Big Bang theory refers to the origin of the Universe. In the beginning, universe is very heavy and small hot ball of matter. It was a point no bigger than the head of a pin when all the things squished with each other and universe is expanded with huge explosion of energy. Due to expansion, it is cooled and results in the formation of Stars and galaxies. After sometime, atoms formed like helium and hydrogen.
Thus, statement (1), (3) and (4) is correct whereas statement (2) and (5) is incorrect. the right answer is - (It expanded slowly), (Stars and galaxies formed,) (Atoms such as hydrogen and helium formed.)
Explanation:
The statement 'stars and galaxies formed' is accurate about how the universe came to be according to the big bang theory.
What is the big bang theory?The big bang theory is a widely accepted theory in physics that intends to understand the origin of the universe.
According to this theory, the universe started with a hot and dense single point that progressively inflated and stretched.
The big bang theory has two major principles:
The universe is continuing to expand nowadays.An explosion caused matter and energy to expand in order to form all the universe.The big bang theory postulates that this phenomenon occurred approximately 13 billion years ago.
In conclusion, the statement 'stars and galaxies formed' is accurate about how the universe came to be according to the big bang theory.
Learn more about the big bang theory here:
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Which of the following states of matter has a definite volume
Answer:
Solid and Liquids
Explanation:
Solid has both definite shape and volume
It's stays on what is there natural appearance.. while
Liquid has definite volume but has indefinite shape
Answer:
[tex]\boxed {\boxed {\sf Solids \ and \ liquids}}[/tex]
Explanation:
Let's review the 3 main states of matter:
Solid:
Particles vibrate, but are stationary. The solid doesn't change under normal conditions. Definite shape and volumeLiquid:
Particles flow and glide. The liquid fills the container. Indefinite shape, definite volumeGas:
Particles fly around rapidly. The gas fills it's container and is very compressible. Indefinite shape and volumeSo, we see that the 2 states of matter with definite volume are solids and liquids.
N
Nitrogen
14.0
Which two parts are needed to make a neutral atom of nitrogen?
A. Electron clouds with a total of seven electrons
B. A nucleus with three protons and four neutrons
O C. A nucleus with seven protons and seven neutrons
D. Electron clouds with a total of 14 electrons
Answer:
electron - proton
Explanation:
fsger
Answer:
A. Electron clouds with a total of seven electrons
Explanation:
A neutral atom of nitrogen must have a total number of 7 electrons in its cloud.
This is the required number of electrons to bring nitrogen into its state of neutrality.
To maintain neutrality the number of protons and electrons in an atom must be equal. A charge atom called an ion have either the proton or electron greater. Neutrality is attained when the number of protons and electrons are the same.Brainless if correct
Answer:
D
Explanation:
Each of the models shown represents a magnesium atom. Which models show the same isotope of magnesium? P, Q, and R
P and Q
P and R
Q and R
Answer:
P and Q
Q and R
Explanation:
To begin, we must bear in mind the meaning of isotope.
Isotopes are atoms having the same atomic number (i.e proton) but different mass number due to the difference in the neutron number present in the atoms involved.
Thus, we shall write out the number of protons, neutrons and electrons present in the model given above. This is given:
Model P:
Proton = 12
Neutron = 13
Electron = 13
Model Q:
Proton = 12
Neutron = 12
Electron = 13
Model R:
Proton = 12
Neutron = 13
Electron = 12
From the above data, we can say that:
1. P and Q are isotope since they have different Neutron number.
2. P and R are not isotope since they have the same Neutron number.
3. Q and R are isotope since they have different Neutron number.
How do atoms make molecules?
Explanation:
Atoms can join together - they form bonds together - to make MOLECULES. ... For example, a hydrogen atom forms one bond, an oxygen atom forms two, and carbon forms four bonds. Look at that molecule of water again - each hydrogen has one bond, and the oxygen in the middle has two bonds. Molecules can be much bigger.
PLEASE HELP WITH THESE THREE (30 POINTS)
1) How is the number of neutrons in the nucleus of an atom calculated?
A. Add the number of elections- and protons+ together
B. Subtract the number of elections- from protons+
C. Subtract the number of protons+ from the atomic mass number
D. Add the atomic mass number to the number of elections-
2) Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr) are in the same group on the periodic table. Why? *
A. They have the same size.
B. They react with each other.
C. They have similar properties.
D. They have the same number of protons
3) Which of the following elements would be a transition metal?
A. Ca
B. Au
C. Rb
D. Fr
What is the density of an object with a mass of 130 g and a volume of 5 cm^3? please explain or im gonna fail 7th grade science
Answer:
26 g/cm³
Explanation:
Given data:
Mass of object = 130 g
Volume of object = 5 cm³
Density of object = ?
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
d = 130 g/ 5cm³
d = 26 g/cm³
Is oxygen radioactive yes or no?
Answer:
ima go with no.....
Explanation:
Answer:
Stable isotopes are variants of atoms that differ in mass but do not decay over time, that is, they are not radioactive. The element oxygen (O) is found in three naturally occurring stable isotopes. So oxygen is not radioactive.
Explanation:
to chemicals mixed together to make heat physiacal or chemical change THATS IS ALL IMMA SAY ( DONT ANSWER IF THERES NO EXPLATION )THXSSS HAVE A GOOD DAY
Answer:its a chemixal change because there are stuff getting mixed togehter making it a chemiacl change
Explanation:
I need help with this!
Answer:
wavelength decreases, the frequency increases
Explanation:
In the electromagnetic spectrum, as the wavelength decreases, the frequency increases.
The wavelength of the wave is the distance between successive troughs and crests along the wave train.
Frequency of the wave of the number of waves that passes through a point per unit of time.
On an electromagnetic wave, as the wavelength decreases the frequency increases. Also, as the wavelength increases the frequency decreases.A small molecule with an overall charge is called a(n)
Answer:
Monotomic atom
Explanation:
Water in a beaker measures 250 milliliters. A rock is completely submerged in the water. The water level now reads 375 milliliters. What is the volume of the rock in cubic centimeters? Explain your answer.PLEASE HELP ASAP
Answer:
Volume of the rock = 125 cubic centimetres
Explanation:
Given:
Water in beaker = 250 millilitres
Water in beaker after rock = 375 millilitres
Find:
Volume of the rock
Computation:
Volume of the rock = Water in beaker after rock - Water in beaker
Volume of the rock = 375 - 250
Volume of the rock = 125 millilitres
1 millilitres = 1 cubic centimetres
So,
Volume of the rock = 125 cubic centimetres
Answer:
The answer is 125 cubic meters
Explanation:
Because you subtract 375-250 and get 125
Answer=125
PLEASE HURRY WILL GIVE BRAINLIEST TO FASTEST, MOST HONEST
of what importance is the gas ozone in the stratosphere? how would a decrease of ozone in the stratosphere affect the radiation received at earth's surface?
Answer :D
It acts as a shield to protect Earth's surface from the Sun's harmful ultraviolet radiation.
There you go :D
Without the weakening of the shield, we would get skin cancer, cataracts, and impaired immune systems.
___
Could you try to answer one of my questions pls? :D
The pressure in a cylinder of nitrogen continuously decreases as a gas is released from it. On the other hand, a cylinder of propane maintain the constant pressure as propane is released. Explain this difference in behavior
Answer:
Explanation:
Nitrogen gas in nitrogen cylinder is in gaseous form only . So when gas is released , pressure decreases because moles of gas in the cylinder decreases .
Propane gas in cylinder is in liquified form . The gas is partially in gaseous and liquid form . So when gas is released outside , pressure decreases inside but due to low pressure , some liquid form is converted into gaseous form which restores the pressure of gas inside cylinder . Hence , the pressure of gas remains unchanged inside cylinder.
HELP PLEASE lol, I just need a couple answers but I can't find this one anywhere, pic of question down below. :)
Answer:
It's b
Explanation:
amino acid is to protien as?
1) fat is to lipid
2) dna is to rna
3)sugar is to fat
4) simple sugar is to starch
8. Were there any problems with the experiment or the methods? Did you have any surprising results
