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
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
Answer:
A) 2.8 atm
Explanation:
Can somebody help me please? it’s urgent
Answers:
See attached table
Explanation:
The isotope symbol will have the mass number and chemical symbol. The atomic number will be equal to the number of protons because the atomic number is the number of protons in an atom. The electrons will be equal to the protons because the atom is neutral. The neutrons can be found by subtracting the number of protons from the mass number. The mass number can be found by adding the protons and neutrons. It is also in the name of the isotope.
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
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.
Mike rides his motorcycle North at an average velocity of 20 meters/second for 500 seconds, how far did he ride?
Answer:
10000
Explanation:
Answer:10,000 meters
Explanation:20x500=10,000
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_______.
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
Why do minerals with metallic bonds conduct electricity so well?
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.
Does standard enthalpy use net ionic equations?a. Trueb. False
Answer:
True
Explanation:
In an ionic reaction, the net ionic equation is used to calculate the standard enthalpy of reaction.
Hence the standard enthalpy of any ionic reaction can be obtained by considering its balanced net ionic reaction equation, hence the answer above.
Which would be an adaptation for living in the tundra?
I Need Help Asap
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:
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.
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.
test results indicated a chemical change has taken place
please help me:) i need to show work too..
Answer:
1 0.005Km
2 3000mg
3 700 cm
5. 2500mm
6 0.0045
Explanation:
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.
Answer:
they each have the same number of protons
Answer:they each have the same number of protons
Explanation:
I just took the test
Causes warm air to rise in the atmosphere. is what type of heat transfer?
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.
Do molecules break or build from a solid to a liquid?
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
List three different forms of potential energy
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?)
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.
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.
Compare and contrast how are predation and parasitism similar how do they differ
What volume of acetic acid of density 1.10g/cm3 is needed to react with 250 mL of 0.50M Stronuim hydroxide?
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.
Calculate the millimoles of solute in 1.88 L of a 0.00713 M NaCN solution. millimoles:
Answer:
13.4 milimoles.
Explanation:
The following data were obtained from the question:
Volume = 1.88 L
Molarity = 0.00713 M
Millimoles of NaCN =?
Next, we shall determine the number of mole NaCN in the solution. This can be obtained as follow:
Molarity = mole /Volume
Volume = 1.88 L
Molarity = 0.00713 M
Mole of NaCN =?
Molarity = mole /Volume
0.00713 = moles of NaCN /1.88
Cross multiply
Mole of NaCN = 0.00713 × 1.88
Mole of NaCN = 0.0134 mole
Finally, we shall convert 0.0134 mole to Millimoles. This can be obtained as follow:
1 mole = 1000 millimoles
Therefore,
0.0134 mole = 0.0134 × 1000
0.0134 mole = 13.4 milimoles
Therefore, the millimoles of the solute, NaCN in the solution is 13.4 milimoles
What’s the symbol of the element that has 8 protons, 9 neutrons, and 8 electrons
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.
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:__________
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
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.
The number 325.608 rounded to 3 significant figures is A) - 326 B) - 325.6 C) - 325.61 D) - 325 BRAINLIEST!!
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.
What is kinetic energy? Give an example please.
Kinetic energy is moving energy or the energy of motion.
If an object is moving like a rock rolling down
a mountain, we say the rock has kinetic energy.
A physical change is chemically the same after the experiment.
True
False
Answer: True
Explanation:
Someone pls help me I don’t know this one
can someone please help me
Which of the following is an example of element? A.Water B.Chlorine C.Carbon Dioxide D.Sugar
lab report for physical and chemical changes??!
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:
Why enthalpy of combustion is always negative ?
Answer:
reason is Heat is involved, the reaction is exothermic and therefore heat is lost to the surrounding