Answer:
b). 0.732
Explanation:
52g Na₂SO₄ x 1 mol Na₂SO₄ x 2 mol Na
------------------------- -------------------- = 0.732 mol Na
142.04 g Na₂SO₄ 1 mol Na₂SO₄
Atomic Mass Units
Na₂ = 22.99 x 2 = 45.98
S = 32.06
O₄ = 16 x 4 = 64
Na₂SO₄ = 45.98 + 32.06 + 64 = 142.04
There are 2 moles of Na in 1 mole of Na₂SO₄
What syndrome did you researched
What describes a chemical reaction?
Answer:
A chemical reaction is a process where two different substances or elements are mixed together. They then undergo some sort of chemical change to become a different substance altogether.
Explanation:
PLEASE HELP 35 POINTSSS
Answer:
I think it's B or A. Though I believe it is more so B. I think I'm right though.
Explanation:
who is considered the father of the periodic table
Answer:
Dmitri Mendeleev
Explanation:
Someone pls help me I will make you brain
Answer:
I believe the answer is II and III
Explanation:
I'm not sure if III is right cause I cannot read the last word but I think it's OK.
Hope this helped :)
PLEASE HELP!!
What kind of metal is Co?
Alkali Metal
Transition Metal
Alkaline Earth Metal
Answer:
I believe Cobalt is a Transition Metal.
Answer:
answer is transition metal
What is Force? I'll Mark BRAINLIEST
Answer:
A push or pull is referred to as a force. Forces can cause objects to move, slow, stop, or change the direction in which they travel. The force of gravity, for example, pulls all objects toward the Earth's center. Every time two things interact, a force is exerted on each of them. When this happens, the two items no longer feel the force after the interaction ends.
Explanation:
Force is that external physical cause which changes or tends to change:
the Direction of a moving body,the dimensions of a non-rigid body,state of rest or motion condition of a body.hope this helps you.
Which of the following is not a stage of the scientific method?
a. using a hypothesis to sell a new product
b. observing, collecting, and communicating data
c. formulating theories
d. formulating hypotheses
Answer:
Using a hypothesis to sell a new product.
please help :((
Which of the following atoms has the largest radius?
1. Na
2. H
3. Ar
4. P
5. F
6. AI
Where do most metabolic reactions occur?
all of the above
O plasma membranes
O nucleus
O cytoplasm
Answer:
CYTOPLASM
Explanation:
MOST REACTION REQUIRE WATER TO OCCUR
SINCE ENZYME WORK BEST WHEN DISSOLVED IN WATER
WATER IS PRESENT IN CYTPLASM HENCE IT IS MAIN SITE OF MEABLIC REACTIONS
HAAAAAALP MEEEEEEEEEEE
Answer:
It would contain 10.
Explanation:
The atomic number: the number of protons.
what are homologous series
Answer:
A homologous series is a series of compounds with the same general formula, usually varying by a single parameter such as the length of a carbon chain. Compounds within a homologous series typically have a fixed set of functional groups that gives them similar chemical and physical properties.
Why it is important to have balanced charges when forming ionic compounds?
[tex]\textbf{Question:-}[/tex]
Why it is important to have balanced charges when forming ionic compounds?
✿[tex]\textbf{Answer:-}[/tex]
As we know electrons can neither be created not destroyed,instead it can be transferred from one medium to another, therefore it is important to have balanced charges when forming ionic compounds. Net ionic equations must be balanced by both mass and charge. Also, the total number of electrons lost by the cationic species must be same with the total number of electrons gained by the anionic species.✿[tex]\textbf{More to know:-}[/tex]
Ionic Compounds-Ionic compounds are solids and hard due to the strong attracting force between the positive and negative ions. These compounds are generally brittle and break into pieces on application of pressure.Ionic compounds contain positively and negatively charged ions in a ratio that results in an overall charge of zero.This image shows electronegativities of elements on the periodic table. Based on this information, which element is most likely to form a strong ionic bond and take on electrons?
(1 point)
helium (He)
cesium (Cs)
fluorine (F)
hydrogen (H)
Answer:
The answer is C. Fluorine.
21. When considering the Bohr model of a neon atom, which of the following is a true statement?
Ten protons would be located in the nucleus, and 10 neutrons would be on the outside of the atom orbiting in rings.
Ten protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.
O Ten protons would be located in the nucleus, and 20 neutrons would be on the outside of the atom orbiting in rings.
OTwenty protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.
The characteristics of the Bohr model allow you to find that the correct answer for the distribution of particles in the atom is:
b) Ten protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.
The bohr model was initially developed for hydrogen, where it manages to fully explain the spectrum of the hydrogen atom, it was quickly spread to other multi-electronic atoms with the characteristic of having a single electron in their last orbit.
The extension to atoms with more than one electron in the last shell the model results are not completely correct.
The Bohr model uses Rutherford's knowledge that the atomic nucleus is a very small part of an atom that contains all its mass, that is, it contains the protons and neutrons and the electrons are in circular orbits around the nucleus.
In the case presented of Neon, its electronic configuration is
1s² 2s² 2p⁶
Let's examine the different claims:
a) False. Protons and neutrons form the mass of the atom, therefore they are both in the nucleus.
b) True. The protons are in the nucleus and the electrons are in circular orbits.
c) False. All protons and neutrons must be in the nucleus, plus neon only has 10 neutrons.
c) False. The number of protons determines the type of atom. An atom with twenty protons is Calcium atom .
In conclusion, using the characteristics of the Bohr model we can find that the correct answer for the distribution of particles in the atom is:
b) Ten protons would be located in the nucleus, and 10 electrons would be on the outside of the atom orbiting in rings.
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why are being flammable and combustible be considered to be chemical properties and not physical properties?
Answer:
Because combustion is a chemical change and not a physical change. Do, flammable and combustible gases burn and change into new substance.
As opposed to a physical change, combustion is a chemical transformation. Combustible and flammable gases do burn and transform into new substances.
What are considered combustible?Combustible materials are those that, when exposed to fire or heat, will ignite, burn, sustain combustion, or produce flammable gases in the form and circumstances anticipated for their application. Combustible materials include rubber, plastics, rubberized materials, and wood.
Are metals combustible?Depending on the environmental factors, most metals are flammable to varied degrees. With water, acids, and other chemicals, certain metals can react in ways that are hazardous. Some metals can spontaneously ignite and heat up.
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Which law specifically combines volume, pressure, and temperature only?
Charles's Law
Gay-Lussac's Law
Combined Gas Law
Ideal Gas Law
Answer:
Boyles law
Explanation:
I think that is combined gas law.
24. Predict the ions that form when magnesium(group IIA) and nitrogen (group VA) react::
Magnesium (group IIA) loses two electrons to become a cation. This is the most energetically favorable way for Magnesium to obtain a valence electron that is stable (octet). When an atom loses electrons it has a positive charge that matches the number of electrons lost.
Nitrogen (group VA) gains three electrons to become an anion. This is the most energetically favorable way for Nitrogen to obtain a valence electron that is stable (octet). When an atom gains electrons it has a negative charge that matches the number of electrons gained.
what is the reason for the difference between the values of the dry adiabatic lapse rate and the moist adiabatic lapse rate?
What is the SI base unit of temperature?
Answer:
Kelvin
Explanation:
Explain error and how it can impact your results from an experiment.
Answer:
Random errors will shift each measurement from its true value by a random amount and in a random direction. These will affect reliability (since they're random) but may not affect the overall accuracy of a result.
For the following element, predict the most likely oxidation number (charge) for its corresponding ion.
Phosphorus
A. P+1
B. P+3
C. P-1
D. P-3
The most likely ion of Phosphorous is P³⁻ (group 15) since gaining three electrons is the most energetically favorable way for it to follow the octet rule.
Because the charge on ions is equivalent to their oxidation state, then -3 is the most likely oxidation number of Phosphorous.
A____ and _______ takes the shape of their containers
Answer:
liquid
gas
Explanation:
liquid has an indefinite shape
gas has an indefinite shape
Answer:
gas and liquid
Explanation:
gas and liquid flow around and take the shape of their containers because the molecules are more spread apart
calculate the kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0 x 10^2 mi/h
Answer:
262.5 Joules
Explanation:
You find the kinetic energy of multiplying half of the mass by the velocity. In this word problem it tells you the mass so you divide it by 2. That answer is 2.625, you then multiply that by the velocity, in this instance it's 1.0 x 10^2 mi/h.
The unit in kinetic energy is Joules. This is actually a really important part in chemistry and physics.
The kinetic energy of a baseball (mass = 5.25 oz) with a velocity of 1.0×10² mi/h is 147.88 joules.
How do we calculate kinetic energy?Kinetic energy of any object will be calculated by using the below equation:
K.E. = 1/2(mv)², where
m = mass of object in kg = 5.25 oz = 0.148 kg
v = velocity in m/sec = 1.0×10² mi/h = 160934 m/h = 44.704 m/s
On putting values on the above equation, we get
K.E. =1/2(0.148)(44.704)²
K.E. = 147.88 joules
Hence required kinetic enrgy is 147.88 joules.
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Pls help!!! for 100 points, please only answer if your actually going to help ! A kitten has a mass of 1582 g and accelerates at 1.7 m/s^2. What is the net force acting upon the kitten?
Write down all the givens from the problem.
Are all of the units in the form required to use the generic equation? If not, then show your conversion.
Write the generic equation (equation with variables only) for this problem. Do not add any spaces between letters or symbols.
Substitute your numbers into the generic equation. This is where you show your math work, step by step. Solve the problem
Enter the numeric portion (numbers only) of your answer here rounded to the nearest tenth.
Enter the numeric portion (numbers only) of your answer here rounded to the nearest tenth.
Answer:
2689.4
Explanation:
NO LINKSSSS PLEASE!!!
The solubility of oxygen gas in water is increased by which of the procedures shown below?
Select one:
a. Decreasing the temperature of the solution.
b. Decreasing the pressure on the solution.
c. Increasing the temperature of the solution.
d. Stirring the solution.
Answer: b
Explanation:
Put in order from smallest to largest radii:
1. AI, Na, CI, Ar, Mg
2. S, Te, Po, Se, O
3. Cl, Ca, S, P, Ga, Mg
4. F, CI, Br, I, At
Answer:
1. Ar, Cl, Al, Mg, Na
2. O, S, Se, Te, Po
Explanation:
Just remember the trends. From left to right, atomic radius decreases because proton increases and pulls electrons closer. From top to bottom, atomic radius increases because there are more electron shells.
where do the electrons that are excited by the energy in sunlight first come from?
Answer:
Pigments in the light-harvesting complex pass light energy to two special chlorophyll a molecules in the reaction center. The light excites an electron from the chlorophyll a pair, which passes to the primary electron acceptor. The excited electron must then be replaced.
Explanation:
During photosynthesis,the electrons that are excited by the energy in sunlight first come from chlorophyll pigment present in the leaves.
What is photosynthesis?It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy through the process of cellular respiration.
Some of the energy which is converted is stored in molecules of carbohydrates like sugar and starches which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.
The process begins with proteins absorbing light energy which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.
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What is the molality of a solution containing 10.0 G of NA2 S04 and 1000.0 G of water
Explanation:
1 literThe total of water is equal to 1000.0 g of water
we need to find the molality of a solution containing 10.0 g of dissolved in Na₂S0₄1000.0 g of water
1. For that find the molar mass
Na: 2 x 22.99= 45.98
S: 32.07
O: 4 x 16= 64
The total molar mass is 142.05
We have to find the number of moles, y
To find the number of moles divide 10.0g by 142.05 g/mol.
So the number of moles is 0.0704 moles.
For the molarity, you need the number of moles divided by the volume. So, 0.0704 mol/1 L.
The molarity would end up being 0.0704 M
The molality of a solution containing 10.0 g of Na2SO4 dissolved in 1000.0 g of water is 0.0704 Mliter
What did the periodic table help scientists discover?
Scientists can use the table to analyze reactivity among elements, predict chemical reactions, understand trends in periodic properties among different elements and speculate on the properties of those yet to be discovered.
