Answer:
The answer is 2C8H18 + 25O2 → 16CO2 + 18H2O .
(Correct me if I am wrong)
Count then plot the total number of atoms in the reactants to total atoms
in the products for the equation 2H2 + O2 + 2H2O
Which of the following is an example of a mixture?
A. NaCl
B. CO2 + H2 + O2
Ос. Са
D. C6H1206
Reset Selection
Answer:
B.
Explanation:
CO2 + H2 + O2 - are 3 individual substances.
HELP ME ILL GIVE YOU 40 POINTS JUST HELP MEEEEEEEEEEE
What causes blood pressure?
A.the strength of the muscles in the walls of the capillaries
B.the speed at which oxygen is returned to blood in the lungs
C. the force with which the ventricles contract
D. the rate at which blood flows through the heart
Answer:
C
Explanation:
What causes blood pressure?
C
To pump blood around the body, the heart contracts and then relaxes through the cardiac cycle. The cycle begins with the contraction of the two atria, which push blood into the ventricles. Then, the ventricles contract, which forces the blood out of the heart.
When the heart pushes blood around the body during systole, the pressure placed on the vessels increases. This is called systolic pressure.
When the heart relaxes between beats and refills with blood, the blood pressure drops. This is called diastolic pressure.
pleaseeeeee yelp!!! 100 points
Question 10 Multiple Choice Worth 3 points)
(05.03 MC)
A glass of juice at 20°C was kept in the open. After 30 minutes, the temperature of the juice remained the same. Which statement is correct?
The temperature of the surrounding air was greater than 20 °C.
The temperature of the surrounding air was less than 20 °C.
The temperature of the juice was equal to the temperature of the surrounding air.
The temperature of the juice was less than the final temperature of the surrounding air.
Answer:
The answer would be B the temperature of the juice was the temperature of the surrounding air...trust me lolllllllllllllllll
Pressure increases from Earth’s surface toward the center of Earth.
True Or False
Answer:
True
Explanation:
The center receives pressure which is what creates convection currents
How is a muscle mutation potentially linked to the size of our brain?
Answer:
I found on internet may be it helps
Explanation:
Here, we provide a general review of recent studies into the genetic basis of human brain evolution. The insights gleaned from these studies can be broadly divided into three categories: (i) positive selection on protein-coding regions of the genome that lead to changes in the sequences of existing proteins; (ii) duplication and deletion of genes; and (iii) evolutionary changes in non-coding regions of the genome, especially those in cis-regulatory sequences that lead to altered gene expression .
In the reaction, HCl + H2O produces H3O + Cl, what is the conjugate acid
Answer:
Conjugate acid is H3O
Explanation:
HCl + H2O = H3O + Cl
HCl = H+ and Cl- = Acid
H2O = OH- and H+ = Neutral as equal OH- and H+
H3O = H3O+ = Acid also known as Hydronium
Cl = Just free floating Chlorine = Cl-
Conjugate acid is H3O
Acid = A solution with more H+ ions than OH- ions.
A. Element
B. Compound
C homogenous mixture
D heterogenous mixture
What is amplitude in chemisty
Answer:
CHEMISTRY GLOSSARY
Amplitude is the displacement of a wave from zero. The maximum amplitude for a wave is the height of a peak or the depth of a trough, relative to the zero displacement line
The English system is used as the International System of Measurement. Please select the best answer from the choices provided T F
do rainforests have hot summers and cold winters?
Answer:
No, rainforests have long wet winters and short dry summers.
Classify the following as an element, compound, homogeneous mixture, or heterogeneous
mixture: salt water
A. Element
B. Compound
C. Homogeneous mixture
D. Heterogenous mixture
Latent heat of vaporization is used to (1 Point) (a) overcome the forces of attraction between molecules in solid-state. (b) increase the kinetic energy of molecules in a liquid state. (c) overcome the forces of attraction between molecules in a liquid state. (d) increase the kinetic energy of molecules in the vapour state.
Answer:
Not sure what the answer is
Explanation:
I did this a while ago and dont remember sorry
Which type of crystal is typified by a sea of delocalized electrons
surrounding the lattice?
O A. lonic
B. Metallic
OC. Macromolecular
D. Chemical
Reset Selection
B.metallic is the answer hope this helped
The correct answer is option B. Metallic.
What explains the structure of metals and delocalized electrons?
Metal is composed of a huge structure of atoms arranged in a regular pattern. Electrons from the outer shell of a metal atom are delocalized and can move freely throughout the structure. This sharing of delocalized electrons results in strong metal bonds.
Metallic bonds are electrostatic attraction between metal cations and the negatively charged ocean of delocalized electrons. The sea of delocalized electrons contains only valence electrons, not core electrons.
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CH3CH2CHCH2 + HCl in iupac
Answer:
But-1-ene and Hydrochloric acid
Explanation:
CH3CH2CHCH2
H H H
H - C- C - C = C
H H H
C - Carbon
H - Hydrogen
But-1-ene
H - Cl
H - Hydrogen = 1+ = Hard Acid
Cl - Chlorine = 1- = Hard Base
Hydrochloric acid
Values for the molar mass of nitrogen, oxygen, and nitrogen dioxide molecules are given in the table below. What mass of nitrogen dioxide molecules is formed when 1 mole of nitrogen reacts with 2 moles of oxygen and forms nitrogen dioxide? Choices: A). 92.02g B). 46.01g C). 23.00g D) 2.00g
Answer:
A). 92.02g
Explanation:
Equation of the reaction;
N2 (g)+ 2O2(g)------> 2NO2(g)
Note that the balanced reaction equation is the first step in solving any problem on stoichiometry. Once the reaction equation is correct, the question can be easily solved.
Reaction of one mole of nitrogen gas with two moles of oxygen gas yields two moles of nitrogen dioxide.
Mass of two moles of nitrogen dioxide= 2[14 + 2(16)] = 2[14+32]= 2[46]= 92 gmol-1
Therefore; Mass of two moles of nitrogen dioxide is 92
If 11 moles of A are combined with 16 moles of B and the reaction occurs to the greatest extent possible, how many moles of C form?
these are easily extracted with a pH solution of greater than 7? which one
A) acid drugs
B) metabolites
C) base drugs
D) derivatives
Answer:
base drugs
Explanation:
The pH scale is a scale graduated from 0-14. It is used as an indicator of the degree of acidity or alkalinity. A pH of 0-6.9 indicates acidity. A pH of 7 indicates that the solution is neutral. A solution of pH above 7 indicates that the substance is basic.
It is thus a correct statement to say that any substance that dissolves in solution to produce a solution of pH greater than 7.0 is a basic substance.
If we look at the options closely, it is only a basic drug that will dissolve in water to yield a basic solution of pH greater than 7.0 hence the answer.
Nonrenewable resources are ?
Answer:
limited resources
Explanation:
nonrenewable resources are those resources found inside the earth that are in a fixed amount. They are being used at a faster rate, and cannot be renewed. These resources include fossil fuels,natural gas, and coal.
// have a great day //
The volume of a gas is 450 mL when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the
pressure when its volume is changed to 2.00 L?
Use PV = P2V2.
0.225 atm
O 0.444 atm
O 2.25 atm
O 4.44 atm
Answer: 0.225 atm
Explanation:
For this problem, we have to use Boyle's Law.
Boyle's Law: P₁V₁=P₂V₂
Since we are asked to find P₂, let's manipulate the equation.
P₂=(P₁V₁)/V₂
[tex]P_{2} =\frac{(1.00atm)(0.45L)}{2.00L}[/tex]
With this equation, the liters cancel out and we will be left with atm.
P₂=0.225 atm
hi:) how to do 2(bi)?
Answer:
4 protons, 5 neutrons, 2 electrons
Explanation:
If you look at the numbers beside Be²⁺, the number 9 is the relative atomic mass and the number 4 is the proton (atomic) number. The relative atomic mass is the sum of the number of protons and the number of neutrons.
Number of protons= proton number.
Hence, number of protons= 4
Number of protons + neutrons= 9
4 + number of neutrons= 9
number of neutrons
= 9 -4
= 5
In an atom, the number of protons and electrons are the same since atoms are electrically neutral. But in an ion, the number of electrons is not equal to the number of protons since the atom gains/ loses electrons to form an ion. A positive sign means that electrons are given away.
Thus, Be gives away 2 electrons to form Be²⁺.
Original number of electrons= 4
Number of electrons in Be²⁺
= 4 -2
= 2
In summary, the number of protons and neutrons in an ion is the same as that of the atom. However, the number of electrons is not the same.
Answer:
Answer:
4 protons, 5 neutrons, 2 electrons
Explanation:
If you look at the numbers beside Be²⁺, the number 9 is the relative atomic mass and the number 4 is the proton (atomic) number. The relative atomic mass is the sum of the number of protons and the number of neutrons.
Number of protons= proton number.
Hence, number of protons= 4
Number of protons + neutrons= 9
4 + number of neutrons= 9
number of neutrons
= 9 -4
= 5
In an atom, the number of protons and electrons are the same since atoms are electrically neutral. But in an ion, the number of electrons is not equal to the number of protons since the atom gains/ loses electrons to form an ion. A positive sign means that electrons are given away.
Thus, Be gives away 2 electrons to form Be²⁺.
Original number of electrons= 4
Number of electrons in Be²⁺
= 4 -2
= 2
In summary, the number of protons and neutrons in an ion is the same as that of the atom. However, the number of electrons is not the same.
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An experimental procedure says to accurately weigh approximately 1 g of
substance on analytical balance. Which of the following measurements are
consistent with these instructions? Select all that apply.
1.0456 g
1.0 g
0.9811g
1 g
1.01g
O 0.99
Answer:
1.0456 g and 0.9811g
Explanation:
The measurements that are consistent with the approximate 1 g instruction would be 1.0456 g and 0.9811g.
Analytical balance generally weighs to an accuracy of 4 decimal places. Hence, every other option that is short of being in 4 decimal places is incorrect.
Also, 1.0456 g and 0.9811g when approximated to the nearest whole number give 1 g.
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In going through the three physical states of matter, water would normally undergo changes in
A) composition.
B) density.
C) mass.
D) weight.
Answer:
COMPOSITION
Explanation:
Brainliest plz
I’ve gotten the answer as x=.478 but when plugging back in, .46/.478 ≠ .22. Help please
Answer:
15. 2.66 moles .
16. 2.09L.
Explanation:
Molarity of a solution is simply defined as the mole of solute per unit litre of the solvent. Mathematically, it is represented as:
Molarity = mole /Volume.
With the above formula, let us answer the questions given above
15. Data obtained from the question include the following:
Volume of solution = 1.4L
Molarity = 1.9M
Mole of solute =.?
Molarity = mole /Volume
1.9 = mole / 1.4
Cross multiply
Mole = 1.9 x 1.4
Mole = 2.66 moles
Therefore, the mole of the solute present in the solution is 2.66 moles.
16. Data obtained from the question include the following:
Mole of solute = 0.46 mole
Molarity = 0.22M
Volume of solvent (water) =.?
Molarity = mole /Volume
0.22 = 0.46/Volume
Cross multiply
0.22 x Volume = 0.46
Divide both side 0.22
Volume = 0.46/0.22
Volume = 2.09L
Therefore, 2.09L of water is required.
What is one way in which chemistry affects your everyday life?
A. Refrigerators use energy more efficiently than they did 10 years
ago.
B. Tap water is safe to drink because it is monitored for harmful
substances.
c. Weather forecasts are now more accurate because of radar.
D. Watches are now more accurate because they are digitalized.
Answer: B
Explanation: Water is filtered with a bunch of chemicals which makes it drinkable.
Need help on #1 thank youu!
Answer:
Oil---> Wood---> Water
Explanation:
Denser things always go on bottom. Since oil is on top is the least dense among those, and then comes wood and then finally water.
1. How many acetate ions are in the compound strontium acetate?
Answer: 2 Acetate ions
Explanation:
Strontium Acetate, has the molecular formular to be; C4H6O4Sr ( or in a linear form, Sr(CH3COO)2), contains two acetate ions.
In one molecule of strontium acetate (Sr(CH₃COO)₂), there are two acetate ions (CH₃COO⁻).
We must first comprehend the chemical composition of strontium acetate in order to calculate the quantity of acetate ions present.
Acetate ions (CH₃COO⁻) and strontium ions (Sr²⁺) combine to linear form the ionic compound strontium acetate. Sr(CH₃COO)₂ is the chemical formula for strontium acetate.
(CH₃COO)₂ stands for two acetate ions in the formula. The (CH₃COO⁻) ion, also referred to as the acetate ion, is a polyatomic ion made up of two carbon (C), three hydrogen (H), and two oxygen (O) atoms. It has a -1 charge overall.
Thus, there are two acetate ions (CH₃COO⁻) in a single molecule of strontium acetate (Sr(CH₃COO)₂).
It's crucial to understand that in ionic compounds like strontium acetate, the ratio of positively charged ions (cations) to negatively charged ions (anions) must be balanced in order to produce a neutral compound. In this instance, the two -1 charges of the acetate ions (CH₃COO⁻) counterbalance the two +2 charges of the strontium ions (Sr²⁺), creating a neutral molecule.
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What is the energy of light with a wavelength of 652 nm? (The speed of light in a vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 J·s.)
O A 3.05 x 10-²⁸ j
O B. 3.28 x 10¹⁸ j
O C. 3.05 x 10-¹⁹ j
D. 3.28 x 10²⁷ j
A and C have negative exponents pleas help me
Answer:
C. 3.05 x 10⁻¹⁹ J
Explanation:
Given;
wavelength of the light, λ = 652 nm = 652 x 10⁻⁹ m
speed of light, c = 3.00 x 10⁸ m/s
Planck's constant, h = 6.626 x 10⁻³⁴J·s
Energy of electromagnetic wave is calculated as;
E = hf
where;
f is frequency of the light wave
f = c / λ
[tex]E = hf = h\frac{c}{\lambda} \\\\E = \frac{hc}{\lambda} \\\\E = \frac{6.626*10^{-34}*3*10^8}{652*10^{-9}} \\\\E = 3.05*10^{-19} \ J[/tex]
Therefore, the energy of the light is 3.05 x 10⁻¹⁹ J
The correct option is "C"
C. 3.05 x 10⁻¹⁹ J
Answer:
Option C. 3.05 x 10¯¹⁹ J
Explanation:
Step 1:
Data obtained from the question.
wavelength (λ) 652 nm = 652x10^–9m
Velocity of light (v) = 3.00x10^8 m/s
Planck's constant (h) = 6.626x10^-34J·s
Step 2:
Determination of the frequency of the light.
The frequency can be obtained as follow
v = λf
3x10^8 = 652x10^–9 x f
Divide both side by 652x10^–9
f = 3x10^8 / 652x10^–9
f = 4.6x10^14s¯¹
Step 3:
Determination of the energy of the light wave.
This can be obtained as follow:
Planck's constant (h) = 6.626x10^-34J·s
Frequency (f) = 4.6x10^14s¯¹
Energy (E) =..?
E = hf
E = 6.626x10^-34 x 4.6x10^14s¯¹
E = 3.05 x 10¯¹⁹ J
A student dissolves 1 g of sugar in 10 g of water she then determines the mass of the solution what is the mass of dissolved sugar and water
Answer:
11grams
Explanation:
Use the law '' conversation of mass ''
Because the sugar dissolved in water.
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The topmost layer of the Earth is made up of large pieces that fit together like a puzzle. However, these pieces don't stay still, and sometimes they rub against each other. When these large sections of the Earth’s crust, called tectonic plates, hit each other, they send vibrations through the surface of the Earth. These vibrations are seismic waves. Seismic waves are just like the ripples in a pond. But instead of traveling through water, they travel through the Earth. When they reach the Earth's surface, they make the ground shake. That's an earthquake.
Earthquakes are the result of?
A ripples traveling through water.
B Earth’s topmost layer sinking.
C vibrations from seismic waves.
D tectonic plates staying still.
Answer:
C- vibrations from seismic waves
Answer:
C vibrations from seismic waves.
Explanation:
The shifting rock in an earthquake causes vibrations called seismic waves.
