Answer:
The unstable nucleus of radioactive atoms emit radiation.
Explanation:
When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced and unstable, or radioactive.
(https://www.epa.gov/radtown/radtown-radioactive-atom-activity-4-atomic-stability)
Answer:
When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable. Whether radioactive elements can become stable and if so, how. The unstable nucleus of radioactive atoms emit radiation. ... This process is called radioactive decay.
Explanation:
1. Based on the Law of Conservation of Mass, if
100g of sodium metal reacts with 25g of
chlorine gas, what will be the total mass of the
product, sodium chloride, created in the
chemical reaction?
2 Na Cl2
2NaCl
100gm + 25gm
+
?
[tex]\boxed{\sf {Na\atop Sodium}+{Cl\atop Chlorine}\longrightarrow {NaCl\atop Sodium Chloride}}[/tex]
Na=100gCl=25g.Mass of reactants :-[tex]\\ \sf\longmapsto Na+Cl[/tex]
[tex]\\ \sf\longmapsto 100+25[/tex]
[tex]\\ \sf\longmapsto 125g[/tex]
Mass of NaCl=125g
What is the density of water (in g/mL) to fouf significant figures at 6°C?
Answer :
0.9999432 g/cm^3
The density of water in g/ml up to 4 significant figures at 6°C is 0.9999432 g/cm³.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant
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What is the function of phloem tissue in the plant transport system?
A.it prepares food
B.it transports food
C.it transports water
D.it provides support
Answer:
option B is the right answer it helps in transfer of food.
Balancing oxidation-reduction reactions
Mg+ N2—>Mg3N2
Answer:
[tex]{ \sf{3Mg_{(s)} + N_{2(g)} →Mg _{3}N_{2(s)}}}[/tex]
Convert to standard notation.
9.3 x 10^-5
Answer:
9.3 x 10^ -5 in standard notation is 0.000093
Explanation:
Since 10 is raised to a -5, this means that there should be 5 zeros before the non-zero digits
MAY SOMEONE HELP ME PLZZ
A tire company wants to determine what kind of rubber will last the longest for their tires. What are some variables that the researchers will want to make controlled variables?
Answer: Rubber source, temperature, thinkness, thread design, driving pattenrs, weather, etc.
Explanation: There are many variables. Here are a few I would include in a tire lifetime study:
1. Type of rubber, including source
2. Thickness of tire
3. Design of tire thread
4. Life as a function of average speed and road surface
5. Expected outside temperature and wet conditions
6. Driving conditions of speed and both acceleration and deceleration parameters (e.g., tire life when slamming on the brakes or accelerating quickly)
Which is larger?
1). 1 liter or 1500 milliliters
2) 12 cm or 12 milliliters
Answer:
1). 1 litre
2).12 cm
Explanation:
In 1 litre = 1000 ml whereas 1500 milliliters equals 0.15 litres and it is same for 12 cm and 12 milliliters
what will happen to the atoms or sbstance when it is condenses
Answer:
Hey mate.....
Explanation:
This is ur answer.....
Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.
Hope it helps!
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What should a prepositional phrase include after the preposition?
A.a noun and its modifiers
B.an adjective and an adverb
C.a subject and a predicate
D.an object and its modifiers
Answer:
B
Explanation:
A prepositional phrase should include after the preposition an object and its modifiers. The correct option is D.
What are prepositional phrases?A prepositional phrase is a group of words that contain a preposition with its object and the words that modify it. These are the words that change verbs and nouns.
For example, Mansi is going out with handsome Brian. Brian is the object and the beautiful is the prepositional phrase. The three types of prepositional phrases are:
Adverb prepositional phrases.Adjective prepositional phrases.Prepositional phrases, behave as nouns.If there are two prepositional phrases used in one sentence. The other prepositional phrase will be used as an adverb.
Thus, the correct option is D. an object and its modifiers.
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GIVING 20 POINTS!! Apply Concepts Two chemists each plan an investigation in which they will combine hydrogen gas with chlorine gas to observe the chemical reactivity. The plans differ in that one will use 25 milligrams each of hydrogen and chlorine, and the other will use 1000 times this amount, i.e., 25 grams each of hydrogen and chlorine. Can the investigations reach similar conclusions about the reactivity of hydrogen with chlorine? Explain.
Answer:
Yes, the investigations will reach similar conclusions about the reactivity of H2 and Cl2
Explanation:
1. The law of multiple proportions says that when elements form compounds, the proportions of the elements in those chemical compounds can be expressed in small whole number ratios. This means that regardless of whether 1000 times more of the products are used, the reactivity of the products is established by the chemical reaction
2. The law of multiple proportions is an extension of the law of definite composition, which states that compounds will consist of defined ratios of elements.
3. A reaction with more reactants will need more care because more products are produced, which can be toxic
4. H2 and Cl2 reactivity does not depend on the quantities but the chemical properties of each compound
As a professor Daniel must complete a research project each year in order to
stay on staff. Daniel is an engineer and has to deal with many complicated
mathematical calculations. Knowing this fact Daniel would most likely concern
himself with qualitative research,
Explanation:
Add our site sources in order to be advantage of knowledge
The strength of van der Waals forces increases as:
A. molecular size decreases
B. molecular size increases
C. number of electrons increases
D. number of electrons decreases
Answer:
B and C
Explanation:
is it multiple choice question??
Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.
What are Van der Waals force?
Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.
An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.
The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.
Therefore, the size and the electron increase the Van der Waals force.
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Which describes a relationship when calculating the energy of a photon? The energy of the photon is directly proportional to frequency. The energy of the photon is inversely proportional to frequency. As the energy of the photon increases, Planck’s constant increases. As the energy of the photon increases, Planck’s constant decreases.
Answer:
The photon is directly proportional to frquency
Explanation:
E=hf
where E is energy
h is plancks constant and
f is frequency
Answer:
A
Explanation:
Edge 2022
A. Identify the type of molecule shown in the drawing. (2 points)
Answer: 1) Caboxylic acid
2) Ether
3) Ester
4) Aldehyde
5) Amine
6) Alcohol
Explanation: The type of a molecule is based it's primary functional group.
https://en.wikipedia.org/wiki/Functional_group
The identities of the given molecules shown in the drawing are:
1) Carboxylic acid.
2) Ether
3) Ester
4) Ethane
5) Aldehyde
6) Amine
7) Alcohol
What are the organic compounds?Organic compounds are those compounds, which contain carbon-carbon and carbon-hydrogen bonds.
The five organic compounds are lipids, carbohydrates, protein, nucleotide, etc.
Thus, the correct option is 1) Carboxylic acid.
2) Ether
3) Ester
4) Ethane
5) Aldehyde
6) Amine
7) Alcohol
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3. Take vinegar, lemon juice, tap water in three separate glass beakers. Put chalk piece,pin, egg shell, leaves in three beakers. Note your observations how test the gas evolved in it.
Answer:
This process is know as Chromotography
Explanation:
What would the car weigh on Earth with a gravitational pull of 9.8 N/kg?
Answer:
Explanation:s the gravitational field strength on Earth's 9.8 N kg?
The gravitational field strength of the Earth is 10 N/kg (10 newtons per kilogram).
what is electron configuration?
Answer:
electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
What are two factors that can change the rate of a chemical?
Answer:
the surface area of a solid reactant.
temperature.
presence/absence of a catalyst.
what amount (in moles) is present in 2.0g of sodium hydroxide,NaOH
Answer: 0.050 moles of NaOH
Explanation: The molar mass of NaOH is 40.0g/mole
2.0g/40.0g/mole = 0.050 moles (2 sig fig)
5. What is common among the following phenomena?
* Blinking of traffic light
* Rotation of blades of fan
* Swinging of pendulum of a clock
a) All are chemical changes
b) All are periodic changes
c) All are undesirable changes
d) All are irreversible changes
Answer:
All are periodic changes
[And is that a todoroki pfp, I like MHA too
(・∀・) ]
give any two reasons that hydrogen is kept in group 1 in Modern Periodic Table
Answer:
Hydrogen is usually classified as a group 1 element since it has one valence electron, just like group 1 metals.
Explanation:
What is the Color of trioxonitrate(v)
Answer:
it's yellowish in color plz Mark me as brainliest
Answer:
It's a yellowish color like copper
I need help on this, It’s due today. Please, anybody
Answer:
1 = 252g, 2 = 2mL, 3 = 1.5mL, 4 = 3g, 5 = 225g, 6 = 0.92g/mL, 7 = 0.75g/mL, 8 = 0.71g/mL, 9 = 1.9mL, 10= 1.11mL, 11 = 76.9g
Explanation:
This problem is testing how well you can move around the equation D = m/v where D = Density (g/mL), m= mass of sample (g), v = volume of sample (mL).
A dehydration reaction (or condensation reaction) is the process in which _____. See Concept 5.1 (Page) View Available Hint(s)for Part A water molecules are produced as a polymer is formed from monomers the bonds between the individual monomers of a polymer are broken by the addition of water molecules water molecules are attracted to each other water molecules are used as a source of raw material to break down polymers to monomers None of the choices is correct.
A dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.
A chemical reaction is the process by which substances called reactants are transformed to another substance known as products through the breaking up or building up of bonds between the reactants.
There are different types of chemicals reaction which includes condensation reaction.
Condensation reaction involves the combination of two smaller molecules known as monomers to for one larger molecule known as polymer with the loss of water molecule.
Condensation reaction is specifically called dehydration reaction due to the loss of water molecule that is involved.
Therefore, a dehydration reaction (or condensation reaction) is the process in which water molecules are produced as a polymer is formed from monomers.
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during the interconversion of state of matter, mass undergoes and change? true or false
True.
The Mass Undergoes change only in ( Solid state to liquid state ) Ice Cube to Water .
Mass changes from mg to litre.
[tex]\huge\mathfrak\red{hope \: it \: helps}[/tex]
A car start from rest and covers distance of 100m after 10seconds.if the acceleration is 2m/s square, calculate the final velocity..
Answer:
20 m/s
Explanation:
solution,
initial velocity (u)=0 m/s
Distance covered(s)=100m
Time taken(t)=10 seconds
Acceleration (a)=2m/s²
Now,
By using first equation of motion, we have
v=u+at
=0+2×10
=20 m/s
I hope it helped U
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Which statement about metals and nonmetals is correct? (1 point)
O Metals and nonmetals can both be found in any column of the periodic table.
O Most metals are a solid under normal conditions, and most nonmetals are a liquid.
O Metals tend to be poor conductors of electricity, while nonmetals are strong conductors of electricity.
O Metals can be hammered into thin sheets, and nonmetals are brittle
Answer:
The answer is the 4th one
The statement about metals and nonmetals that is correct is: "The Metals can be hammered into thin sheets, and nonmetals are brittle."
Metals are found mostly towards the left hand side of the periodic table. Non-metal character increases as you move towards the right hand side of the table.
One common property of metals is that they are malleable; this means that they can be hammered into sheets while a common property of nonmetals is that most of them are brittle.
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Measurements of the heights of various plants in an experiment are called
Answer:
Option 1 Data
Answer:
data
Explanation:
that is the answer
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Which of the following statements correctly explains why the excretory system is different from the digestive system? (1 point)
The excretory system is different from the digestive system because it removes waste from the body by filtering water, which
includes mostly the by-products of metabolism.
The excretory system is different from the digestive system because it removes waste from the body by filtering urine, which
includes mostly the by-products of metabolism
The excretory system is different from the digestive system because it removes waste from the body by filtering food, which
includes mostly the by-products of metabolism. filtering food
SS
2
The excretory system is different from the digestive system because it removes waste from the body by filtering blood, which
o
includes mostly the by-products of metabolism
U.
Hey
Answer:
The excretory system removes waste from the body. remove waste from the blood. The digestive system breaks down the food you eat into nutrients that provide energy and building materials for cells. The digestive and excretory sytems work together to process the food that you eat.
Which equation represents a decomposition reaction?
O 4P +502 → 2P205
O H2SO4 + 2NaOH → Na2SO4 + 2H2O
O 2C8H18 + 2502 → 16CO2 + 18H2O
O 6NaNO3 → 6NaNO2 + 302
There are various type of chemical reactions in chemistry like combination reaction , displacement reaction. One of these is the decomposition reaction. The correct option is option D.
What is decomposition reaction?Decomposition reaction is the one in which molecules breaks down in its constituent in presence of energy. Energy can be in any form, it can be light energy , heat energy.
Decomposition of water is done by providing electricity and the reaction is called electrolysis. Lysis means to break. To give decomposition reaction molecule must have more than one element.
The fourth reaction describe a decomposition reaction (NaNO3 decomposed to become NaNO2 and O2). First and third reaction are considered combustion reaction (reacting with oxygen). Second reaction is acid-base reaction.
Therefore, the correct option is option D.
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