Answer:
It's C. Ethanol produces hydrogen when it burns
When burned, ethanol produces water and CO2.
What is the approximate mass of one electron?
Answer:
9.1093837015 × 10^−31 kg
Very small mass
How could you describe the changes that happen when carbon changes form from graphite to diamond?
The change from graphite to diamond is a chemical change.
A chemical change involves the rearrangement of atoms in a substance. In other words, the "composition" of the substance changes when a chemical change takes place.
This is clearly seen when graphite changes to diamond. The arrangement of carbon atoms changes as reflected by the change in the density of graphite when it is converted to diamond.
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If a sample of water has a mass of 200g and the final solution has a mass of 230g, how much solute dissolved in the water?
Could someone plz help me
Answer:
A
Explanation:
B: not B. Opinions don't matter. Facts do.
C: its a consideration. It will limit the scope of the experiment. But it's not relevant to the investigation. Not C
D: You might want to contact some scientists to see what they think about your investigation, but randomly interviewing anyone and everyone is not the answer.
You want to do A for certain.
4. What is a scientific law, and how does it
differ from a theory?
What accurately describes the reactants of a reaction
Answer:
Substance that are used in the reaction
Explanation:
I hope this will help you
Answer:
Substances that are used in the reaction. Hope my answer helps you!
place the letters on the spectrum below from least scientific two more scientific A. All living things are composed of one or more cells. We know this because every living thing examined to date has
been found to be composed of one or more cells.
B. If you break a mirror, you will have seven years of bad luck.
C. The Earth is flat. Anybody can see that!
D. Taking Vitamin C prevents the common cold. Linus Pauling, the Nobel laureate who discovered the structure of
Vitamin C, says it does.
E. Humans have a soul. I believe this because it says so in the Bible. The soul is what separates us from animals.
F. The rate of acceleration of all falling objects on Earth is constant. Two spheres of identical diameter and volume are
dropped from the top of a building; one is made of steel, the other made of a plastic polymer. They both will accel-
crate at the same rate (32 ft/s) and hit the ground at the same time.
Answer: B, C, E, D, A, F
Explanation: It is a little difficult to assign a regid order to these statements. Much depends on one's definition of "more scientific." My thoughts:
B: Only in the movies
C: Flat Earthers still exist, but no one has ever fallen off the edge, that I'm aware of
E: I've had a few pets with souls. My cat has it in for me.
D: I met Linus Pauling twice - he was too enthusiastic with his vitamin C and did not critically evaluate the evidence, but he was far more correct than the Flat-Earthers.
A: Lots of good evidence, although it can also depend on the definition of "living," Is a virus "living?"
F: Yep, I've done it myself. Heavier object have more inertia - they are the couch potatoes of physics. They will take their own time to get moving.
What is the relationship between a calorie and a
joule?
1. Why Isn't Hess's law helpful for calculating the heat of reaction Involved in the conversion of diamond to graphite?
Answer:
This law is not applicable or not helpful in the conversion of diamond to graphite because both are just allotropes of carbon along with C60 (Buckminsterfullerene or buckyball), C540, C70, amorphous carbon, and carbon nanotube
Explanation: did that help? hope it did!
What is density? How do you find it?
Density is the measure of a mass per unit volume of a material substance
density= Mass/volume
The unit of density is g/cm^3
Which of the following is an example of climate?
The polar regions have long winters and short, cool summers.
Humidity levels are high today.
Canada experienced an unusually warm summer this year.
Tornados formed across Oklahoma yesterday.
Answer:
"The polar regions have long winters and short, cool summers."
Explanation:
Climate is the average of that weather. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall.
For Climate example:
You can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July.
An excess of a divalent metal M was dissolved in a limited volume of hydrocloric acid. If 576cm³ of hydrogen was librated at s.t.p , what was the mass of metal that produced this volume of gydrogen?( M = 24, H = 1 , molar volume of gas at s.t.p = 22.4dm³)
Answer:
14.8 g
Explanation:
step 1 You first have to convert the cm^3 to dm^3 by dividing the volume by 1000 then find the number of mols for Hydrogen gas
from there you can use the of moles for hydrogen to find the moles of the metal step 2
then step 3 you multiply the number of by The Mr or Fr giving you your mass
When measuring the volume of an object you are finding the?
A. Single dimension of an object
B. Amount of 2 dimensional space an object covers
C. Amount of 3 dimensional space the object occupies
D. Amount of 4 dimensional space an object occupies
Answer:
C. Amount of 3 dimensional space the object occupies
Explanation:
Single dimension is a laminar
Amount of 2 dimension is area
Amount of 4 dimension is negligible
[tex].[/tex]
Answer C. Amount of 3 dimensional space the object occupies
Explanation:
Single dimension is a laminarAmount of 2 dimension is areaAmount of 4 dimension is negligible
Which is true about atoms?
A. They are always made from other compounds.
B. They are always motionless.
C. They can combine to form other substances.
D. They cannot combine to form other
simbstances.
Answer:
They are always motion less
Explanation:
I hope that is an ok answer for you:)
Let me know if I can help you in any other ways
The more energy a particle has, the
more it will move. Which statement is
true about the energy level of liquids?
A. Liquids have less energy than solids.
B. Liquids have more energy than solids.
C. Liquids have more energy than gases and plasma.
D. Liquids have no energy.
Option B is the answer.
Hope it helps you
Hi,
Answer:
B. Liquids have more energy than solids.
Which of the following statements correctly explains why the excretory system is different from the digestive system? (1 point)
The excretory system is different from the digestive system because it removes waste from the body by filtering water, which
includes mostly the by-products of metabolism.
The excretory system is different from the digestive system because it removes waste from the body by filtering urine, which
includes mostly the by-products of metabolism
The excretory system is different from the digestive system because it removes waste from the body by filtering food, which
includes mostly the by-products of metabolism. filtering food
SS
2
The excretory system is different from the digestive system because it removes waste from the body by filtering blood, which
o
includes mostly the by-products of metabolism
U.
Hey
Answer:
The excretory system removes waste from the body. remove waste from the blood. The digestive system breaks down the food you eat into nutrients that provide energy and building materials for cells. The digestive and excretory sytems work together to process the food that you eat.
Help Please I need to finish TODAY
Answer:
A. > digestive and circulation
B. > digestive and excertory
C. > nervous and muscluar
D.> digestive and circulation
hope this helps !! please make brainlest!
How to convert 2.37 l tp dl?
Answer:
23.7
Explanation:
The formula to convert from L to dL is:
dL = L x 10
SURELY SOMEONE HELP it’s urgent plllss I’ll brainlist u/5 star!!! answer the ones u know. :)
Answer:
3 exothermic reaction. only that much
Hi,
These are the answers.
• Question 2. C , Substance dissolves
• Question 3. D , Exothermic reaction
• Question 4. C , Endothermic reaction takes place
• Question 5. A , the products formed has more energy than reactants
Hope it helps you... pls mark brainliest if it helped you
A researcher wants to conduct an experiment to see how the amount of breakfast a student eats
affects their performance in school. He makes 2 groups, one group consumes 300 calories in
the morning while the second group does not eat breakfast at all. After 2 weeks he compares
the students test scores and every student takes the same tests. Identify the following:
a. Control Group:
b. Independent Variable:
c. Dependent Variable:
The control group are the students who eat no breakfast. The independent variable is the consumption of breakfast. The dependent variable is the performance of students in school.
In an experiment, the control group is the group that did not receive the treatment. The treatment in this case is the consumption of breakfast. Hence the group that did not consume breakfast is the control group.
The independent variable is the variable that is being manipulated and its effect evaluated. The manipulated variable here is consumption of food.
The dependent variable is the variable that is being measured. In this case, it is the performance of students at school.
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What is required for electrons to move from the stable energy level to an excited state?
answer
When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle
what is the concentration of hydrogen ion, H+, present in a water sample if 100. ml of the sample requires 7.2 ml of 2.5 x 10 -3 M NaOH to be neutralized
Answer: 1.8x10^-4 M H+
Explanation: The number of moles of NaOH added to the 100 ml soultion will be equal to the number of moles of H+ present in that solution.
Moles NaOH in 7.2 ml of 2.5x10^-3 M NaOH
(2.5x10^-3 M NaOH) is the same as 2.5x10^-3 moles NaOH/liter
(2.5x10^-3 moles NaOH/liter)*(7.2 ml)*(1 liter/1000ml) = 1.8x10^-4 moles NaOH used to titrate 100 ml of the acid. That means there was 1.8x10^-4 moles of H^+ in 100 ml.
Concentration of H^+ = (1.8x10^-4 moles H)/0.100 l) = 1.8x10^-4 M H+
(pH of 3.74)
he difference between a stable isotope and an unstable isotope of an element is that __________. ANSWER the unstable isotope decays and is always transformed into a stable form of the same element the stable isotope has a nucleus that decays spontaneously and is radioactive the unstable isotope has a nucleus that does not decay spontaneously and is never radioactive the stable isotope has a nucleus that decays spontaneously but is not radioactive the unstable isotope has a nucleus that decays spontaneously, is radioactive, and can be transformed into an atom of another elemen
We know that any known element is defined by the number of protons in its nucleus (which is the same as the number of orbiting electrons).
We can define isotopes as the atoms of the same element but that have a different number of neutrons in the nucleus. The correct statement of the difference between stable isotopes and unstable isotopes is:
"The difference between a stable isotope and an unstable isotope of an element is that the unstable isotope has a nucleus that decays spontaneously, is radioactive, and can be transformed into an atom of another element"
Particularly we can define two of these, the stable isotopes, that can remain as they are for a lot of time, and the unstable isotopes, that have more neutrons in its nucleus than a stable isotope, and because having those extra neutrons in the nucleus needs energy, eventually the isotope will experience a spontaneous radioactive decay, which "breaks" the nucleus in different ways, and, in some cases, generates different elements in the process.
Then we can conclude that:
"The difference between a stable isotope and an unstable isotope of an element is that the unstable isotope has a nucleus that decays spontaneously, is radioactive, and can be transformed into an atom of another element"
If you want to learn more, you can read:
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A(n)_________ test only one factor at a time
Answer:
controlled experiment
State the period and group to which aluminum belongs to in the periodic table
Explanation:
aluminium belongs to group 13 and period 3
Can someone plz help me? Plzz giving brainliest!
(Plz chose 3 questions)
Answer:
Facts: A D and maybe C I think you are intended to say C
Explanation:
A is certainly not an opinion. It is either true, or it is not. I think it is intended as a fact.
B is an opinion (which I think is true)
C is kind of iffy. It might be true and it might be an opinion. In looking it up, it is factually incorrect. Cats are related to wildcats in the middle east.
D is also iffy. They can just eat disease free rodents. I'd classify it as more opinion than fact.
E. definitely an opinion.
How would you prove that Sodium hydroxide is a
Base without using litmus paper
to test ? Give the equation for the
reaction
In a nuclear reaction 5.02 ×10^-28 kg of a radioactive sample reduced to 4.02×10^-29 Kg producing 259.74 Mer energy. Calculate the speed emitted. [ mer= 1.6×10^-13].
I need urgent answer with method pls
Answer:
2jd
Explanation:
Heueneirnfjgnjfbgjgfj,fqiywyjeukdhsjdshmsjhskdlhkddvndkurmbsjhsmjdjgsjlsmhudksyke
Why will goats protect wildfires
Explanation:
The goats can stretch their necks up to 7 feet, biting branches and low lying leaves. They eat poison oak and can clear rocky cliffs -- something other livestock can't do. And it's easier to control where the goats cut a fire break, unlike controlled burns -- another method of removing wildfire fuel.
pls mark me branilestwhat are the three formula of mole?
[tex] \huge \boxed{\mathfrak{Formulas} \downarrow}[/tex]
For all[tex] \large \sf \: mole = \frac{mass}{molar \: mass} \\ [/tex]
For gases[tex]\large \sf \:mole = \frac{volume}{molar \: volume} \\ [/tex]
For solutions[tex]\large \sf \:concentration \: ( \frac{g}{ {dm}^{3} } ) \\\large \sf \: = \frac{mass(g)}{volume( {dm}^{3} )} [/tex]
You can substitute mass with mole for concentration (mol/dm³).