Answers
Answer:
A. 3 Significant Figures
B. 6 Significant Figures
C. 2 Significant Figures
D. 4 Significant Figures
E. 4 Significant Figures
F. 5 Significant Figures
Explanation:
Related Questions
lab report for physical and chemical changes??!
Answers
Answer:
[See Below]
Explanation:
✦ Physical Changes:
✧ Is when the form changes, but not the chemicals in that form.
✧ An example of this would be chopping wood. It's still wood but it's a different size now. It's easier to burn it since it's smaller.
✦ Chemical Changes:
✧ Is when the chemicals inside that form change to something else entirely
✧ An example would be an egg, when you cook the egg it can turn into being scrambled or fried. But you can't eat the raw egg until the chemicals change.
~Hope this helps Mate. If you need anything feel free to message me.
Answer:
Here is an example of the full report for this type of lab. Includes data table etc. I would suggest making some changes on wording prior to submission
Explanation:
When sand is coated with a layer of trimethylhydroxysilane, (CH3)3SiOH, it repels water and can no longer get wet. Hydrophobic sand (aka, magic sand) is fun to play with, but it can also have useful applications in agriculture to reduce water consumption (Water Resour. Manag. 2010, 24, 2237–2246). Predict the geometry for the silicon atom in trimethylhydroxysilane.
The geometry of the silicon atom in trimethylhydroxysilane is:__________
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Reactants undergo chemical reaction to form products.this chemical equation represents one such reaction.the coefficient for one of the reactants or products is incorrect .which part of the chemical equation is incorrect
Answers
Answer:
Explanation:
The part of 10 O2 is wrong.
Explanation:
The correct equation can be written as follows:
2 C 4 H 10 + 13 O 2 → 8 C O 2 + 10 H 2 O
The equation was not balanced before.
For a balanced chemical reaction, the number of atoms before and after the reaction should be the same. This is because matter is neither created not destroyed in a reaction, It changes from one form to another through chemical reactions.
How is the light emitted by an atom related to its electron configuration?A. Light is produced when an electron moves from a higher to a lower energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.B. Light is produced when an electron moves from a lower to a higher energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.C. Light is produced when a proton moves from a higher to a lower energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.D. Light is produced when a proton moves from a lower to a higher energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.
Answers
Answer:
Light is produced when an electron moves from a higher to a lower energy level. The color of the light (as we see it) depends on the amount of energy emitted by the electron.
Explanation:
According to the Bohr's model of the atom, energy is given out by an atom when an electron moves from a higher to a lower energy level. The energy of the emitted light is equal to the energy difference between the two energy levels.
Hence ;
∆E= E2 - E1
Where;
E2 = energy of the higher energy level
E1 = energy of the lower energy level.
By supplying light of various frequencies and observing the frequency/wavelength of light emitted by a particular atom, its electron configuration can be determined.
How many constitutionally isomeric monochlorination products are possible from the following?a. 2-Methylpentane b. 3-Methylpentane c. 2,2-Dimethylbutane d. 2,3-Dimethylbutane
Answers
Answer:
a. 5
b. 4
c. 3
d. 2
Explanation:
How many constitutionally isomeric monochlorination products are possible from the following?
a. 2-Methylpentane
In 2-methylpentane, there are five possible monochlorinated substitutional products in the reaction of chlorination of 2-methylpentane in the presence of sunlight.
b. In 3-methylpentane there are four possible monochlorinated substitutional products in the reaction of chlorination of 3-methylpentane in the presence of sunlight.
c. In 2,2-Dimethylbutane there are three possible monochlorinated substitutional products in the reaction of chlorination of 2,2-Dimethylbutane in the presence of sunlight.
d. In 2,3-Dimethylbutane there are two possible monochlorinated substitutional products in the reaction of chlorination of 2,3-Dimethylbutane in the presence of sunlight.
Which of the following elements is a metalloid? A. vanadium (V) B. radon (Rn) C. silicon (Si) D. rubidium (Rb)
Answers
Answer:
silicon
Explanation:
Why do minerals with metallic bonds conduct electricity so well?
Answers
Answer and Explanation:
Because metallic bonding involves delocalized electrons. It is described as a "sea of electrons", because the electrons are not confined around the nucleus of metal atoms, but they are delocalized: thay can be located in one nucleus and then in another neighbor atom. Thus, the electrons have more freedom to move from one part of the metal to another and electricity is well conducted.
please help me:) i need to show work too..
Answers
Answer:
1 0.005Km
2 3000mg
3 700 cm
5. 2500mm
6 0.0045
Explanation:
Causes warm air to rise in the atmosphere. is what type of heat transfer?
Answers
Answer: Convection
Explanation: Convection is the transfer of heat energy in a fluid. This type of heating is most commonly seen in the kitchen with a boiling liquid. Air in the atmosphere acts as a fluid.
A gas in a 6.2 mL cylinder has a pressure of 1.4 atmospheres. A piston is pushed in
until the gas volume is 3.1 mL, while the temperature remains constant. What's the
final pressure of the gas in the cylinder?
A) 2.8 atm
B) 4.8 atm
C) 3.2 atm
OD) 5.6 atm
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Answer:
A) 2.8 atm
Explanation:
List three different forms of potential energy
Answers
Answer:
Types of Potential Energy
Elastic Potential Energy. Anything that can act like a spring or a rubber band can have elastic potential energy. ...
Gravitational Potential Energy. There is a constant attractive force between the Earth and everything surrounding it, due to gravity. ...
Chemical Potential Energy.
(IF THIS HELPED CAN YOU GIVE ME A BRAINYLEST PLEASE?)
Why enthalpy of combustion is always negative ?
Answers
Answer:
reason is Heat is involved, the reaction is exothermic and therefore heat is lost to the surrounding
What phase(s) of matter are the elements in Main Group 8?
Answers
Answer:
Solids.
Explanation:
Group 8 on the Periodic Table consists of transition metals:
- Fe (Iron)
- Ru (Ruthenium)
- Os (Osmium)
- Hs (Hassium)
Usually, transition metals are solids.
Which would be an adaptation for living in the tundra?
I Need Help Asap
Answers
Answer:
Long fur
Explanation:
Long fur is an adaption for the tundra because it is cold and snowy in the tundra, so therefore long fur is an adaption
Answer:
thic long fur that overs you
Explanation:
which can be found on the periodic table: elements, compoumds or mixtures? pleaae help!!!!!!!!
Answers
Answer:
Elements
Explanation:
A compound: contains atoms of different elements chemically combined together in a fixed ratio.
A mixture: contain different elements and compounds but the ratio is not fixed nor are they combined via chemical bonds.
Answer:
elements can be found on a periodic table
What’s the symbol of the element that has 8 protons, 9 neutrons, and 8 electrons
Answers
Answer:
oxygen
Explanation:
The given isotope has 8 protons and 8 electrons, so the atomic number of the given isotope is 8, which is the atomic number of oxygen.
What volume of acetic acid of density 1.10g/cm3 is needed to react with 250 mL of 0.50M Stronuim hydroxide?
Answers
Answer:
[tex]V=13.6cm^3[/tex]
Explanation:
Hello,
In this case, given the reaction in which the acetic acid reacts with strontium hydroxide to yield water and strontium acetate:
[tex]2CH_3COOH+Sr(OH)_2\rightarrow Sr(CH_3COO)_2+2H_2O[/tex]
The first step here is to compute the moles of strontium hydroxide that are reacting given its volume in liters (0.250 L) and concentration:
[tex]n_{Sr(OH)_2}=0.50mol/L*0.250L=0.125molSr(OH)_2[/tex]
Next, considering the 1:2 mole ratio between the strontium hydroxide and the acetic acid (molar mass = 60 g/mol) we compute the grams of acid that are consumed:
[tex]m_{CH_3COOH}=0.125molSr(OH)_2*\frac{2molCH_3COOH}{1molSr(OH)_2} *\frac{60gCH_3COOH}{1molCH_3COOH}\\ \\m_{CH_3COOH}=15gCH_3COOH[/tex]
Then, by using the density of the acetic acid, we compute the volume:
[tex]V=\frac{m}{\rho}=\frac{15g}{1.10g/cm^3} \\ \\V=13.6cm^3[/tex]
Best regards.
can someone please help me
Answers
A biochemical reaction will proceed in the direction as written if:_______a. ΔG > 0.b. ΔH > 0.c. ΔG = zero.d. ΔG < 0.e. ΔH < 0.
Answers
Answer:
ΔG < 0
Explanation:
The condition for spontaneity of a chemical reaction is that ∆G<0. Hence for any biochemical reaction to proceed as written, ∆G must have a negative value.
If ∆G >0, the reaction is not spontaneous and will not proceed as written. ∆G=0 means that the reaction has attained equilibrium.
test results indicated a chemical change has taken place
Answers
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
It is possible to make a buffer that functions well near pH 7 using citric acid, which contains only carboxylate groups. Explain. Drag the terms on the left to the appropriate blanks on the right to complete the sentences.a. decreaseb. increasec. repulsionsd. associatese. attractionsf. dissociate1. Successive deprotonations______the (−) charge density on the resulting anion.2.This results in unfavorable electrostatic_____between the carboxylate anions, which reduces the likelihood that a proton would_____.3. It is more favorable for the proton to remain bound to reduce unfavorable charge_______.
Answers
Complete Question
it is possible to make a buffer that functions well near pH 7 using citric acid, which contains only carboxylate groups. Explain. Drag the terms on the left to the appropriate blanks on the right to complete the sentences.
Words : decrease, increase, repulsion, associates, attractions, dissociate
1. Successive deprotonations -------------- the (−) charge density on the resulting anion.
2.This results in unfavorable electrostatic --------- between the carboxylate anions, which reduces the likelihood that a proton would ----------
3.it is more favorable for the proton to remain bound to reduce unfavorable charge----------- . .
Answer:
1
Successive deprotonations increase the (−) charge density on the resulting anion.
2
This results in unfavorable electrostatic repulsion between the carboxylate anions, which reduces the likelihood that a proton would dissociate
3
It is more favorable for the proton to remain bound to reduce unfavorable charge repulsion
Explanation:
Generally
Successive deprotonations decrease the (−) charge density on the resulting anion.
This because deprotonations means removal of positive charge
This results in unfavorable electrostatic repulsion between the carboxylate anions, which reduces the likelihood that a proton would dissociate
It is more favorable for the proton to remain bound to reduce unfavorable charge repulsion
Psychoanalysis (Freud) is concerned with Question 1 options: chemical balances in the brain someone's measurable actions childhood trauma Self-actualization
Answers
Answer:
childhood trauma.
Explanation:
I took the test and the answer i got correct was Childhood trauma.
What is true about all uranium atoms?
They each have the same number of nuclear
particles.
They each have the same number of neutral
particles.
O They each have the same number of neutrons.
They each have the same number of protons.
Answers
Answer:
they each have the same number of protons
Answer:they each have the same number of protons
Explanation:
I just took the test
Which of the following is an example of element? A.Water B.Chlorine C.Carbon Dioxide D.Sugar
Answers
Mike rides his motorcycle North at an average velocity of 20 meters/second for 500 seconds, how far did he ride?
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Answer:
10000
Explanation:
Answer:10,000 meters
Explanation:20x500=10,000
name one benifit and one limitation of comparative investigations
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Answer:
Limitation of comparative investigation is that when it is done on a huge population, huge amount cost is required. Explanation: Benefit of comparative investigation is that we can get descrete information about specific breed or species. It is important for the study of behaviour of many organisms.
Explanation:
Do molecules break or build from a solid to a liquid?
Answers
Answer:
they break
Explanation:
Molecules move more freely when it is a liquid state. To keep it a solid, it will bunch together.
Answer:
I think they break.
Explanation:
They do not build a solid to a liquid
You have developed a promising anti-cancer agent, but it has poor solubility in water. Which of the following changes should improve water solubility? ( there is two possible answers)a) adding a methyl groupb) adding a hydroxyl groupc) adding a carboxyl groupd) increasing the size of the druge) adding a benzene ring
Answers
Answer:
adding a hydroxyl group
adding a carboxyl group
Explanation:
The addition of a hydroxyl or a carboxyl group to the molecule will increase its solubility. This is because, the -OH group will form hydrogen bonds with the water molecules. The formation of such hydrogen bonds will lead to improvement in the solubility of the anti cancer agent and solve the problem of poor solubility of the anticancer agent in water.
Compare and contrast how are predation and parasitism similar how do they differ
Answers
The number 325.608 rounded to 3 significant figures is A) - 326 B) - 325.6 C) - 325.61 D) - 325 BRAINLIEST!!
Answers
Answer:
A.326
Explanation:
B is incorrect because that would be 4 significant figures.
C is incorrect because that would be 5 significant figures.
D is incorrect because, while it is 3 significant figures, it is rounding the .6 down which doesn't make sense. since it's .6 you should be rounding up not down.