The independent variable is the different amounts of salt that will be added to the water.
What is a variable?A variable is any characteristic, number, or quantity that can be measured or counted.
The independent variable is the different amounts salt that will be added to the water (what is done by the scientist).
The dependent variable is the boiling temperature of the water (what is being measured).
HYPOTHESIS: If salt is added to water then, the boiling temperature is lowered.
Hence, the independent variable is the different amounts of salt that will be added to the water.
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How many grams of oxygen gas (02) are needed to completely react with 9.30 moles
of aluminum?
4A1+302 → 2Al2O3
9.30 mol Al
3 mol O₂
4 mol Al
32.0 g 0₂
1 mol O₂
[?] g 0₂
Answer:
223 g O₂
Explanation:
To find the mass of oxygen gas needed, you need to (1) convert moles Al to moles O₂ (via the mole-to-mole ratio from reaction coefficients) and then (2) convert moles O₂ to grams O₂ (via the molar mass). When writing your ratios/conversions, the desired unit should be in the numerator in order to allow for the cancellation of the previous unit. The final answer should have 3 sig figs because the given value (9.30 moles) has 3 sig figs.
4 Al + 3 O₂ ----> 2 Al₂O₃
^ ^
Molar Mass (O₂): 32.0 g/mol
9.3 moles Al 3 moles O₂ 32.0 g
------------------- x --------------------- x -------------------- = 223 g O₂
4 moles Al 1 mole
The integrating center for the negative feedback loop that regulates body temperature is the.
Answer: Hypothalamus
Explanation:
The hypothalamus controls body temperature by sending signals to muscles, organs, glands, and other components of the nervous system when it becomes too low or too high. These structures then help in returning the body temperature to normal.
Which statement best describes a physical change?
Explanation:
A physical change is one which can be reversed.it also does not produce any new substance.
changes in state such as the melting of a solid, the freezing and vaporization of a liquid as well as changes In shape are examples of physical changes
What is the simplest method of determining the composition of a compound?
Answer:
Chemical formulas tell you how many atoms of each element are in a compound, and empirical formulas tell you the simplest or most reduced ratio of elements in a compound. If a compound's chemical formula cannot be reduced anymore, then the empirical formula is the same as the chemical formula.
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What are the conditions needed for reaction to happen in aldehydes and ketones?
Please help thank you
Explanation:
You may not realise it, but you come across aldehydes and ketones many times a day. Take cakes and biscuits, for example. Their golden, caramelised crust is formed thanks to the Mailliard reaction. This is a process that occurs at temperatures above 140° C, when sugars with the carbonyl group in foods react with nucleophilic amino acids to create new and complex flavours and aromas.
Another example is formaldehyde. Correctly known as methanal, it is the most common aldehyde in industry. It has multiple uses, such as in tanning and embalming, or as a fungicide. However, we can also react it with different molecules to make a variety of more useful compounds. These include polymers, adhesives and precursors to explosives. But how do aldehydes and ketones react, and why?You should remember from Aldehydes and Ketones that they both contain the carbonyl functional group , . This is a carbon atom joined to an oxygen atom by a double bond. Let's take a closer look at it.
If we compare the electronegativities of carbon and oxygen, we can see that oxygen is a lot more electronegative than carbon.
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What is the chemical formula for the molecule represented by the model?
CHO
C4H9O2
C4H8O
C3H8O2
The correct formula of the molecule is C4H9O2.
What is a model?The model of a compound is a representation of the molecule. It gives us an idea of what the molecule looks like as well as its molecular formula.
Looking at the structure of the compound as shown in the model in the question, the correct formula of the molecule is C4H9O2.
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Answer:C4H9O2.
Explanation:
Which question cannot be answered through scientific inquiry?
OA. Do people with more spare time live longer than those with less
spare time?
OB. Are people happier if they have more spare time?
OC. What is the relationship between how long a person lives and how
many hours per week they work?
OD. How does the number of hours worked per week affect a person's
health?
SABMIT
Answer: Are people happier if they have more spare time?
Explanation:
Happiness cannot be measured quantitatively.
Which of the following reactions would result in decreased entropy?
Q A. CO,(s) → CO2(g)
OB. H₂O(g) → H₂O()
OC. 203(g) → 30₂(g)
D. N₂204(g) → 2NO₂(g)
The reaction that would result in decreased entropy is : ( A ) CO(s) → CO2(g)
What are Endothermic reactionsReactions that absorb heat from its surroundings are known as endothermic reactions, Endothermic reactions result in a decreased entropy as the temperature of the surrounding becomes lower than the temperature of the container where the reaction occurs.
Examples of endothermic reactions are : melting and evaporation which results in the change of state from solid to liquid or from solid to gaseous state.
Hence we can conclude that The reaction that would result in decreased entropy is : ( A ) CO(s) → CO2(g)
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Webb has calculated the percent composition of a compound. How can he check his result?
what are the most abundant metal in the earths crust from 1 to 10
Answer:
1. Oxygen - 46.1%
2. Silicon - 28.2%
3. Aluminium - 8.23%
4. Iron - 5.63%
5. Calcium - 4.15%
6. Sodium - 2.36%
7. Magnesium - 2.33%
8. Potassium - 2.09%
9. Titanium - 0.565%
10.Hydrogen -0.140%
Explanation:
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Temperature is one of the conditions that affects both physical and chemical change. Support the statement with an example.
Temperature affects both physical and chemical change because it modifies the state of matter and also it alters the rate of chemical reactions.
How does temperature affect physicochemical properties?Temperature affects physical properties by increasing the motion of constituent atoms and thus altering the state of matter.
Moreover, in a chemical reaction, an increase in temperature also affects the conversion rate of a reactant to one or more products.
In conclusion, temperature affects both physical and chemical change because it modifies the state of matter and also it alters the rate of chemical reactions.
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Please Answer!!!!
Which equation is balanced?
A) H₂+ O2 → H₂O + O2
B) 4H2₂+ O2 → H₂O + O
C) 2H₂ + O2 → 2H₂O
D) H₂ + O2 → H₂O
Option C is the correct answer
2H₂ + O2 → 2H₂OIn LHSNo. of hydrogen atoms is 4No. of oxygen atoms is 2In RHS No. of hydrogen atoms is 4No. of oxygen atoms is 2Hence , LHS = RHS
A balanced equation obey the law of conservation of mass. According to this law mass can neither be created nor be destroyed. Among the given options, the balanced equation is 2H₂ + O₂ → 2H₂O. The correct option is C.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products are equal on both sides of the equation is defined as the balanced chemical equation. The numbers which are used to balance the equation are called the coefficients.
The coefficients are generally placed in front of the formulas. The substances on the left hand side are called the reactants and the substances on the right hand side are called the products.
Here the balanced equation is:
2H₂ + O₂ → 2H₂O
The number of 'H' and 'O' atoms are equal on both sides.
Thus the correct option is C.
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What is the correct formula that would result from the combination of the two ionic species?
Cs¹+ and Cl¹-
Answer:
CsCl
Explanation:
The ionic species are:
Cs⁺ and Cl⁻
how is uranus and saturn similar
Answer:
Like Saturn, Uranus has rings and moons. But unlike Saturn — and indeed every other planet in the solar system — the ice giant is tipped on its side. In other words, rather than spinning like a top as it circles the sun, Uranus rolls around on its side.
Explanation:
If air was not allowed to stream
through the kiln, how would the
production of lime be affected?
Explain your answer.
Answer:
The air flow carries away the carbon dioxide formed during the decomposition. Once accumulated in the furnace or if the air was not allowed to stream through, it begins to react again with the newly formed calcium oxide, equilibrating rather than completing the reaction.
Using the conclusion from ruthefords model, identify a charged subatomic particle that is located in the nucleus
You could say either protons or neutrons.
What is lawn sand made up of and clay don’t copy straight off Cuz I can’t write the same thing it has
Answer:
?? what i dont understand
What do scientists and engineers have in common?
Answer:
Engineers and scientists both use methods of science and facts.
Explanation:
They often use Math and computer in calculations.
Answer:
Scientists and engineers both use the facts and methods of science, and both often use MATH and COMPUTERS in their work.
Explanation:
Whose view that matter is infinitely divisible was considered correct for most of the last two millennia?.
Aristotle and Democritus (to some extent) view that matter is infinitely divisible was considered correct for most of the last two millennia
What is Matter ?Anything that occupies space and have some mass is known as matter.
Aristotle believed that everything was comprised of earth, air, water, and fire, which were infinitely divisible.
Democritus stated that matter was subdivided into indivisible and immutable particles that created the appearance of change when they joined and separated from others.
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A, B, C, or D, thanks for the help
According to the label the true statement about the following substance is option c. It does not pose a health risk
What are lab labels ?
Specially designed labels with particularly specialised adhesive qualities are called "lab labels." In the pharmaceutical or medical industry, as well as in laboratories, they are used for labelling. For the labelling of tubes, test tubes, blood bags, and other types of vessels, special laboratory labels are created.
Labels on chemicals
The identify of the hazardous chemical(s) in the container (for example, chemical name) and the dangers present must both be listed on this label. This warning about hazards can be distributed in a variety of ways. Employers want to choose a solution that will function in each place.
The following label indicates that the chemical does not pose a health risk.
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would you expect the substance to float or sink in water if mass is 25g and volume is 7 cm
Answer:
Sink
Explanation:
For a substance to float in water, it must be less dense than water. The density of water is 1 g/cm^3. To find the density of the substance, we can do mass/volume, which in this case is 25g/7cm^3. We see that [tex]25/7 > 1[/tex], so the substance would sink.
How many moles of oxygen are in 4.4 moles of Al(NO3)3 ?
Answer: 40. mol (to 2 sf)
Explanation:
Since there are 9 oxygen atoms in every molecule of aluminum nitrate, this means that there are 9 moles of oxygen atoms in each mole of aluminum nitrate.
So, in 4.4 moles, there are 9(4.4) = 40. mol (to 2 sf)
Suppose you use bottles and balloons to run an experiment to measure the amount of metabolism by yeast. One of your bottles has black coffee and yeast, with a balloon sealing the top of the bottle. After 3 hours, you note that the balloon has not inflated at all. What is the most likely reason that it did not inflate
The yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.
What is the product of the action of glucose on yeast?Yeast metabolizes sugar or glucose to produce alcohol and carbon dioxide.
The carbon dioxide produced is responsible for the raising action of yeast on dough and for the inflation of the balloon.
In the experiment, the possible reason why the balloon did not inflate is that the yeast was not able to metabolize the sugar in black coffee and so, no carbon dioxide was produced.
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For a particular chemical reaction, the enthalpy of the reactants is -400 kJ. The enthalpy of the products is -390 kJ. The entropy of the reactants is 0.2 kJ/K. The entropy of the products is 0.3 kJ/K. The temperature of the reaction is 25 degrees Celsius. What can you conclude about this reaction
Answer:
For a particular chemical reaction, the enthalpy of the reactants is -400 kJ. The enthalpy of the products is -390 kJ. The entropy of the reactants is 0.2 kJ/K. The entropy of the products is 0.3 kJ/K. The temperature of the reaction is 25oC. What can you conclude about this reaction?
It is exergonic
It is endergonic
it is a redox reaction
It is being catalyzed by an enzyme
A reduction reaction involves either the addition of hydrogen or removal of:
Reduction involves the either the addition of hydrogen and removal of oxygen.
What is reduction?Reduction involves the removal of oxygen.
This implies there is a loss of oxygen in reduction.
This can be represented in the extraction of iron from it ores.
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Reduction is also the addition of hydrogen. This implies it is the gain of hydrogen.
For example
CH₃CHO → CH₃CH₂OH
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Considering the activity series given below for metals and nonmetals, which reaction will occur? Al > Mn > Zn > Cr > Fe > Cd > Co > Ni > Sn > Pb > H > Sb > Bi > Cu > Ag > Pd >Hg > Pt F > Cl > Br > I
(a) 2NaBr + I2 --> 2NaI + Br2
(b) 2Fe + Al2O3 --> 2Al + Fe2O3
(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag
(d) Pb + Zn(C2H3O2)2 --> Zn + Pb(C2H3O2)2
(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag
can see all wavelengths/photons of light emitted from excited electrons.
No, all wavelengths/photons of light are emitted from excited electrons.
What is wavelength?Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
When an atom's electrons move to a lower energy state, the atom releases energy in the form of a photon. Depending on the energy involved in the emission process, this photon may or may not occur in the visible range of the electromagnetic spectrum.
Hence, no, all wavelengths/photons of light are emitted from excited electrons.
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. Sodium hydroxide is added drop by drop to some hydrochloric acid in a beaker. Which of the following occurs in the beaker? .
Answer:
Table salt+water
Explanation:
When hydrochloric acid and sodium hydroxide interact it results in the formation of salt and a release of heat. The result of these 2 highly aggressive compounds is table salt and water. (Compounds that are ultimately harmless, even beneficial to us human beings)
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How does this evidence indicate that the reaction has occurred between ions? Be specific and explain why the meter readings change throughout the experiment.
The evidence indicate that the reaction has occurred between ions i.e, change of state of the reactants, e.g. precipitation.
What is Precipitation ?In an aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution.
The reaction of the ions can be checked by a number of methods.
In a chemical reaction, the ions are in the acqeuos solution which means that they are in solution, dissolved with charge.
During the reaction (ionic) there is an attraction between the positive and negative ions.
This makes a change in the state of the reactants in the products.
In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.
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anyone? got an answer
