Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together.
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Iron has a density of 7.87 g/cm3. If 52.4 g of iron is added to 75.0 mL of water in a graduated cylinder, to what volume reading will the water level in the cylinder rise?
Answer: 81.7 ml
Explanation:
1 cm^3 = 1 ml
Divide the total mass by it's density to find it's volume:
(52.4g/7.87g/ml) = 6.658 ml
Add to 75.0 ml to arrive at a final volume of 81.7 ml
How many pounds of force is 240 Newtons?
Answer:
53.9541 pound force...
Which of the following is an example of combustion?
O A. potassium chlorate -> potassium chloride + oxygen
B. aluminum + cobalt chloride -> aluminum chloride + cobalt
O c. hexane + oxygen carbon dioxide + water
OD. sodium cyanide + hydrochloric acid -> sodium sulfate + hydrogen cyanide
The
Is the treatment you manipulate in an experiment?
Answer:
Not exactly such but Experimental manipulation describes the process by which researchers purposefully change, alter or influence the independent variables(IVs), which are also called treatment variables or factors in an experimental research design.
difference between peak, orbit and orbital
Answer:
An orbit is a fixed path on which electrons revolve around the nucleus. An orbital is the probable area of finding the maximum density of electrons in an atom. An orbit is a planar representation, i.e., a two dimensional representation.
Calculate the heat when 100.0 mL of 0.500 M HCl is mixed with 300.0 mL of 0.100 M Ba(OH)2. Assuming that the temperature of both solutions was initially 25.0C and that the final mixture has a mass of 400.0 g and a specific heat capacity of 4.18 J/C g, calculate the final temperature of the mixture.
Answer:
26.8°C
Explanation:
For this reaction, the equation can be computed as follows:
[tex]2HCl_{(aq)}+ Ba (OH)_{2(aq)} \to BaCl_{2(aq)} + 2H_2O_{(l)} \ \ \ \ \ \ \Delta H= -118 \ kJ[/tex]
Now, Given that:
100.0 mL of 0.500 molarity (M) of HCl reacted with 300.0 mL of 0.100 molarity of Ba(OH)2.
The next process is to determine the number of moles of the solute:
For HCl:
no of mole = [tex]\dfrac{0.500 \times 100}{1000}[/tex]
= 0.05 mol
For Ba(OH)2:
no of mole =[tex]\dfrac{0.100\times 300}{1000}[/tex]
= 0.03 mol
From the reaction, at the reactant side, we will see that two moles of HCl reacted with one mole of Ba(OH)2.
It implies that HCl is the limiting agent since it is in lesser quantity.
Similarly, the heat given out of the system is 118 kJ for each two moles of HCl with one mole of B(OH)2.
Hence, for 0.05 moles of HCl, the heat emitted out is:
[tex]= 0.05 mole \times ( \dfrac{118 \ kJ}{2 \mol})[/tex]
= 2.95 kJ
Let's recall from the question that:
the heat emitted was moved to the final mixture with mass =400g
the specific heat capacity = 4.18 J/°C g
Initial temperature = 25°C
∴
Using the formula;
ΔH = mass × specific heat capacity × (T_f - T_i)
Then, replacing the values, we have:
2.95 kJ = 400 g × 4.18 J/°C g × ( T_f - 25° C)
2950 J = 400 × 4.18 J/°C × ( T_f - 25° C)
[tex]T_f = \dfrac{2950 \ J}{400 \times 4.18 \ J/^0 C}+25^0\ C[/tex]
[tex]\mathbf{ T_f = 26.8^0 \ C}[/tex]
what compound has a molar mass of 37.11 g/mol
Answer:
Explanation:
The closest I can come to this is
Li C2H5 which would really be weird, but it comes to nearly 37.11. Everything depends on the periodic table you are using.
C2 = 2 * 12.011 = 24.022
H5 = 5 * 1.008 = 5.040
Li = 1 * 6.94 6.94
Total 36.002
What would you use to measure the height of a sample?
Question 2 options:
ruler
beaker
graduated cylinder
electronic balance
Answer:
please clear ur ques with image
it's unable to be understood
...
what is the requirements to obtain citizenship?
please answer it correctly
Answer:
Age. ...
Residency. ...
Residence and Physical Presence.
Good Moral Character.
Attachment to the Constitution.
Language.
U.S. Government and History Knowledge.
Oath of Allegiance.
These are some requirements for obtaining citizenship .
What Chemicals including in Cosmetic?
The chemicals including in cosmetic are:-
1.Talcum Powder
2.Nanoparticles
3.Coal Tar
4.Triclosan
5.Toluene
Hope this helps you.
Which of the following properties would helium have?
A. Closely packed and structured particles
B. Fills entire container
C. Definite volume
D. Definite shape
Reset Selection
Answer:
B
Explanation:
It is a gas and therefore according to particle model of matter it has large spaces between them and does not have a definite shape
Among the following properties, Helium would fills entire container. Hence Option (B) is correct.
What is States of Matter ?
A “state of matter” is a way to describe the behaviour of atoms and molecules in a substance.
There are three common states of matter: Solids – relatively rigid, definite volume and shape. In a solid, the atoms and molecules are attached to each other. They vibrate in place but don't move around.
Helium is a gas in nature and thus fills entire container.
Therefore, Among the following properties, Helium would fills entire container. Hence Option (B) is correct.
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what is chemistry?????
Answer:
chemistry - the science that studies the properties of substances and natural fenomens .
...........
Answer:
The Basic definition of Chemistry is:-
Chemistry is the scientific study of the properties and behavior of matter. It is the natural science that covers the elements that make up matter to the compounds that is composed of atoms, molecules and ions.
What is the freezing point in °C) of a 0.743 m
aqueous solution of KCI?
Enter your rounded answer with
3 decimal places.
K; for water = 1.86 °C/m
Answer:
2.764 °C
Explanation:
ΔT = 2 x 1.86 C/m x 0.743m = 2.764C That means the freezing point of the solution is 2.764C less than the pure solvent (water)
Why does the battery give a reading of 9V even though there are no electrons flowing around the circuit?
Answer:
because battery have it's own voltage in it's composition
The solubility of gases
when the temperature is
increased.
A. increases
B. decreases
C. does not change
Answer:
B. decreases
Explanation:
The solubility of gases in a liquid is inversely proportional to the temperature, it means that if you increase the temperature, the solubility decreases.
What are abiotic factors of the ecosystem
Answer:
Abiotic factors are the non-living components of the ecosystem, including its chemical and physical factors.
Hope this helps.
Answer:
Abiotic factors of ecoystem are non-living creatures present on ecosystem.
what effect does smiling on at teacher mean when given no homework mean please give me an answer thanks guys
Answer:
no n o n o n o nonono in o no n o n I n jo n b
Explanation:
no no no no no no n on on on I I j
hurry
A solution:
A. is a mixture that is made when a solid dissolves and combines with a liquid.
B. is the amount of a substance that will combine with another substance before they begin to chemically combine.
C. is the amount of a substance that will dissolve in 1 dm3 of water at 25 C .
D. is two or more substances that are combined together but not chemically joined.
Reset Selection
Answer:
b is the correct answer ok
A solution is made up of solute and solvent. It is an addition of two or more substances to each other that combines physically and chemically. Thus, option B is correct.
What is a solution?A solution is the mixture of solutes that can be more than one in a solvent that has the same composition all over (homogenous). A solution comprises two main elements called a solute and a solvent.
A solute is the part of the solution that has been added to the solvent for desolvation. On the other hand, the solvent is the substance that dissolves the solute in them to make a solution.
The homogenous mixture or the solution can be created by mixing salt and water, sugar and water, mercury in amalgamated zinc, coffee, vinegar, etc.
Therefore, option B. a solution is the addition of the substances that combine physically.
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Circle the correct term to complete the sentence: When you dilute a solution, the resulting solution has a concentration that is (increased/decreased) and the volume is (increased/decreased).
Answer:. The concentration is decreased and the volume is increased.
Explanation: Diluting a solution means adding more solvent, usually water, meaning that there is less solute in any sample of the solution. Adding more solvent means that the volume of the solution will increase.
Which is a correct statement of what occurs at a turbine during electricity
production?
A. They are burned by fossil fuels.
B. They are turned by workers,
C. They are melted by heating.
O D. They are turned using steam.
Answer:
I think option(D) is more appropriate but not sure.
The correct statement of what occurs at a turbine during electricity production is they are turned using steam. The correct option is D.
What is a turbine?A turbine is a fan-like structure that runs by hydro or air power that generates electricity. Turbines that produce electricity are huge structures made of iron or heavy metal.
Electricity is a form of energy that converts thermal energy into electrical energy, which leads to burning the light or running fans and other machines. It is an important form of energy because all machines and power run by electricity.
Turbines run by using steam. They convert steam or fluid or air into mechanical energy. The water run over the turbines and when turbines move it produces electricity and energy.
Thus, the correct option is D. They are turned using steam.
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How does a balanced chemical equation represent the conservation of
matter in a chemical reaction?
1. There are more atoms in the reactants than in the products.
2. The type of matter in the products is different from the type of matter in
the reactants.
3. The number of atoms of each element in the reactants equals the number
of atoms of each element in the products.
4. There are fewer atoms in the reactants than in the products
Answer:
The correct answer would be 3. The number of atoms of each element in the reactants equals the number of atoms of each element in the products.
Explanation:
The law of conservation of matter states that energy cannot be created or destroyed, only transfered. Thus, option 3 is correct.
Am I correct?
(Plz don’t used this for points or typing random things…plz don’t)
Answer and Explanation:
The answers would be:
A. Domestic cats live in about 34% of homes in the United States. (Statistical statements are, most of the time, facts and not an opinion)
C. Modern domestic cats are closely related to Near Eastern wildcats. (Fact)
D. Cats eat rodents that can spread disease. (Fact)
The above statements are facts because they don't make a judgement or show a position on the topic, only show what is known and proven to be true.
B and E are incorrect because they take a side of the topic, in which someone else might disagree with the opinion. These opinions aren't proven to be true.
#teamtrees #PAW (Plant And Water)
I hope this helps!
Assess two situations in which it is important to question scientific issues in the media.
Answer:
Claims based on vague statements and statements from non-experts.
Explanation:
In an electrochemical cell, equilibrium is the point at which:
A. None of these
B. both electrodes have an equal number of electrons.
C. ion concentrations are no longer changing and the voltage is 0.
D. Equilibrium cannot be reached in a voltaic cell because electrons only flow in one direction.
Answer:
C. ion concentrations are no longer changing and the voltage is 0.
Explanation:
Electrochemical cells are a device that generates current from redox reactions. In the cell, the equilibrium is reached when the voltage drops to 0. Thus, option C is correct.
What is an electrochemical cell?An electrochemical cell is a voltaic device that uses chemical energy to generate electrical energy and vice versa. It is of two types electrolytic and galvanic cells depending on the energy it produces.
The electrochemical cell comprises two electrodes namely an anode and cathode, a salt bridge or the porous barrier, and an external connection.
The connection shows the voltage that indicates the equilibrium. When the current flow stops and the voltage reaches zero, the electrochemical cell is said to be in equilibrium.
Therefore, no change in the ionic concentrations and zero voltage indicates equilibrium.
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please Help!! And answer ASAP!!! Give two examples of compounds that form extended structures instead of molecules. Using a complete
sentence.
Answer:
A structure whose sub-units occur in a constant ratio and are arranged in a repeating pattern; the sub-unit can be individual atoms or a molecule.
Heterometallic systems Which employ multiple building units to produce extended structures.
And
Design and assessment of extended structures often require the generation of spatially variable earthquake motions to be used as multiple-support inputs.
Explanation:
Such As A Polymer For Instance.
A type of extended structure that is made of many smaller, repeating sub-units in a chain; Although, The repeating sub-unit is a unique molecule. I Hope That This Answer Helps.
what are the 2 main methods of combination of elements??
Answer:
to make them react to each other to form a compound
Explanation:
mark me as brainliest pls
Answer:
An element is a material that consists of a single type of atom. Each atom type contains the same number of protons. Chemical bonds link elements together to form more complex molecules called compounds. A compound consists of two or more types of elements held together by covalent or ionic bonds.
can you solve this science question ⁉️
Answer:
chemical reaction between those a b c it's a reaction which occurs when heating
in one to two sentences, explain why structural formulas are good for depicting polymers
Structural formulas of polymers show the actual arrangement of atoms within the polymer. This helps us to explain some of the observed properties of the polymer.
A polymer is composed of monomers. Monomers are small molecules which could link together to form a larger molecule.
There are three kinds of formulas that could be used to represent a chemical substance;
Empirical formulaMolecular formulaStructural formulaTh structural formula shows the actual arrangement of atoms in the polymer. When we have an idea of the actual arrangement of atoms in the polymer, certain properties of the polymer substance become easily understandable.
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Pesticides and fertilizers are a major cause of
O air pollution
O acid rain
o the greenhouse effect
O groundwater pollution
Answer:
it means air pollution Environment. The chemicals and nutrients found in fertilizers, while beneficial for agricultural crops, can be lethal in high doses for fish, birds and other wildlife. Pesticides, designed to kill pests chemically, are also dangerous when leached into soil or groundwater supplies.
Who is most likely to lose an electron when becoming an ion? A. Iodine (I) B. Calcium (Ca) C. Nitrogen (N) D. Helium (He)
Calcium (Ca) is most likely to lose an electron when becoming an ion because it is a metal (Option B).
How can elements be classified?In the periodic table, elements can be classified in 3 big groups.
Metals: they tend to lose electrons to form cations.Non-metals: they tend to gain electrons to form anions.Noble gases: they are stable so they do not tend to gain or lose electrons.Who is most likely to lose an electron when becoming an ion?
A. Iodine (I). No, since Iodine is a non-metal.
B. Calcium (Ca). Yes, since calcium is a metal.
C. Nitrogen (N). No, since nitrogen is a non-metal.
D. Helium (He). No, since helium is a noble gas.
Calcium (Ca) is most likely to lose an electron when becoming an ion because it is a metal (Option B). Specifically, calcium forms a cation.
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