Answer:
5 Significant Figures
Explanation:
13.26 g has
significant figures
1.
0
1
2
3
4.
Answer:
13.26 g has 4 significant figures
Which of the following is correct?
a. One molecule of methane reacts with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water.
b. One gram of methane reacts with two grams of oxygen to produce one gram of carbon dioxide and two grams of water.
c. One mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and 2 moles of water.
d. a and c are correct.
Answer:
The correct option is d. a and c are correct.
Explanation:
First, we will write a balanced equation for the reaction between methane (CH₄) and oxygen (O₂).
The reaction between methane (CH₄) and oxygen (O₂) gives carbon dioxide (CO₂) and water (H₂O). The balanced equation for the reaction is shown below
CH₄ + 2O₂ → CO₂ + 2H₂O
The number beside each molecule on the reactant side indicates the number of the individual molecules required for complete reaction and also the number beside each molecule on the product side indicates the number of the individual molecules produces in the reaction.
This means,
One molecule of methane will react with two molecules of oxygen to produce one molecule of carbon dioxide and two molecules of water. Hence, option a is correct.
From,
Number of molecules = Number of moles × Avogadro's number
Since Avogadro's number is constant, hence, the equation also means,
One mole of methane will react with two moles of oxygen to produce one mole of carbon dioxide and two moles of water. Hence, option c is correct.
For the mass relationship,
Mass = Number of moles × Molar mass
Molar mass of methane = 12 + 1(4) = 16 g/mol;
∴1g of methane = 0.0625 mole
Molar mass of oxygen = 16 g/mol;
∴2g of oxygen = 0.125 mole
Molar mass of carbon dioxide = 12 + 16(2) = 44 g/mol;
∴1g of CO₂ = 0.02272 mole
Molar mass of water = 1(2) + 16 = 18 g/mol;
∴2g of water = 0.11111 mole
From the equation 0.0625 mole of methane reacts with 0.125 mole of oxygen to produce 0.0625 mole of carbon dioxide and 0.125 moles of water.
Hence, option b is not correct.
How do scientists calculate the energy and frequency of photons?
5 Laboratory instructions require students to as- semble a measuring device containing many small parts and springs. Which piece of safety equipment would be required in this investigation
A apron
B gloves
c lab coat
D safety glasses
Answer
C lab coat
Explanation
Answer:
c
Explanation:
three examples of disaccharides
Answer:
sucrose
lactose
maltose
Hope this helps :)
Entrance Question: What is a physical trait? Explain using complete sentences.
Answer: A physical trait is a defining aspect or feature of your body or other subject that you can see visually.
Explanation:
Which statement best describes the chart? Heat was removed from the activation energy to create the product. Heat was added to create the product. The products have less energy than the reactants. The products have the same energy as the reactants.
Answer:
A. Heat … Get the answers you need, now! ... A. Heat was removed from the activation energy to create the product. ... C. The products have less energy than the reactants. D. The products have the same energy as the reactants.
Explanation:
Answer:
its B. Heat was added to create the product.
Explanation:
just took the test on edg2020 :)
How many cubic centimeters of an ore containing only 0.22% gold (by mass) must be processed to obtain $100.00 worth of gold? The density of the ore is 8.0 g/cm3 and the price of gold is $818 per troy ounce. (14.6 troy oz = 1.0 ordinary pound, called an avoirdupois pound; 1 lb = 454 g)
Answer:
The cubic centimetres of the ore containing 0.22% gold (by mass) that must be processed to obtain the $100.00 worth of gold is approximately 216 cm³
Explanation:
The percentage by mass of gold in the ore = 0.22%
The density of the ore = 8.0 g/cm³
The price of the gold = $818 per troy ounce
14.6 troy oz = 1.0 pound
1 lb = 454 g
Given that one troy ounce = $818
$100 worth of gold = 1/818 ×100 troy ounce = 100/818 troy ounce
1 troy oz = 1.0/14.6 lb
100/818 troy oz = 100/818 × 1.0/14.6 lb = 250/29857 lb ≈ 0.0084 lb
1 lb = 454 g
250/29857 lb = 454 × 250/29857 g ≈ 3.8015 g
$100 = 3.8015 g worth of gold
The mass, M, of the ore containing 3.8015 g of gold is given as follows;
0.22% of M = 3.8015 g
0.22/100 × M = 3.8015 g
M = 3.8015 g × 100/0.22 = 1727.933 g
The volume, V, of the ore containing 3.8015 g of gold is given as follows;
Density of ore = Mass of ore/(Volume of ore)
Volume of ore = Mass of ore /(Density of ore)
The density of the ore = 8.0 g/cm³
Volume of ore = 1727.933 g /(8.0 g/cm³) = 215.99 cm³ ≈ 216 cm³
Therefore, the cubic centimetres of the ore containing 0.22% gold (by mass) that must be processed to obtain the $100.00 worth of gold ≈ 216 cm³.
How does distance affect the forces of attraction an repulsion?
Explanation:
Increasing the separation distance between objects decreases the force of attraction or repulsion between the objects. Decreasing the separation distance between objects increases the force of attraction or repulsion between the objects. ... Electrostatic force and distance are inversely related. That is how distance affects the forces of attraction or repulsionwhat is the electrons...
Electrons are negativity charge particle found in an atom. His twine is Proton who is positively charged
The individual components of a solution
Answer:
"can be separated using physical means" is the answer
Which category would sawdust be in
Answer:
If you are asking what state of matter sawdust is, the answer is solid.
Explanation:
Solid substances can be hard or soft, but they have low compressibility and usually maintain their shape on their own.
what is the answer of (9*10^4)^3?
Answer:
7.29 x 10^14
Hope this helped! :)
Hydrocarbons that contoins least double bond are
Answer:
Chemistry has taught that ;
Unsaturated hydrocarbon molecules that contain one or more double bonds are called alkenes.
Alkynes are unsaturated hydrocarbons due to the fact that some of the carbons are connected to fewer than four neighbouring atoms.
Note : Alkenes contain at least one double bond, while alkynes contain at least one triple bond.
Explanation:
Another way of writing 0.00000731 g
Answer:
nanograms - 7310
kilograms - 7.310000000000001e-9
what labatory activity involves a chemical change
Answer:
buring of paper, burning of wood etc are the examples of chemical change
What is not a product of modern chemistry ?
Answer:
Modern chemistry describes the composition, structure, and physical and chemical properties of substances. ... The main aim of modern chemistry is to improve the communication and conversation among the scientists, researchers, engineers, and policymakers, who are working under the area of modern chemistry
Explanation:
I hope this helps you!!
A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 6.9 mL. If the metal weighs 4.9 g, what is the density of the metal?
Answer:
The density of the metal is 0.561 g/mL
Explanation:
The computation of the density of the metal is shown below;
As we know that
The Density of the metal is
[tex]= \frac{mass}{volume}[/tex]
where,
Mass = 4.9g
Change in volume = 6.9 mL
Now place these values to the above formula
So, the density of the metal is
[tex]= \frac{4.9g}{6.9mL}[/tex]
= 0.561 g/mL
Hence, the density of the metal is 0.561 g/mL
We simply applied the above formula so that the correct density could arrive
Express 0.044 km in meters.
Answer:
44
Explanation:
You multiply the length value by 1000
Answer:
0.044 km × 1000 = 44 meters
How did Louis Pasteur’s experiments lead to new scientific understandings of germs? A.Experiments with cooking food showed that disease-carrying germs in food could be killed when heated. B.Experiments with different magnification lenses showed that germs were real and could be observed. C.Experiments with animals showed that dominant genes could lead to risks of disease. D.Experiments with shallow dishes showed that groups of germs could be grown so they could be seen without microscopes.
Answer:
A.Experiments with cooking food showed that disease-carrying germs in food could be killed when heated.
Explanation:
Louis Pasteur (1822-1895) is regarded as the father of immunology. He extensively studied microbes and their effect on food. He discovered that microorganisms were responsible for the spoilage of food.
His most important discovery was the fact that heating wine to 55°C will lead to the death of microorganisms and prevented wine from spoiling and did not affect its taste. This process is known as pasteurization.
Answer:
A
Explanation:
1) A person counts the number of flowers she sees on different types of plants. She records data
every week.
a. Independent Variable (IV):
b. Dependent Variable (DV):
c. Control Group:
d. Constants:
Answer:
Explanation:
An independent variable is the variable that is intentionally altered or changed during the course of an experiment and is not dependent on another variable. The independent variable from the narration in the question is the different types of plants (as seen, the type of plant was intentionally changed during the course of the experiment).
A dependent variable is the variable whose "outcome" is assumed/expected to be dependent on another variable called the independent variable. The dependent variable from the narration in the question is the number of flowers (as seen, the outcome/number of flowers is expected to be dependent on the type of plant).
The control group is the group that is used as a reference (or benchmark) for the sake of comparisons while reporting an experiment. From the narration in the question, nothing was mentioned as regards the control group.
Constants are unchanged factors that are maintained throughout the course of an experiment. From the narration, the constant is the time in which her observations are done which is weekly (every week).
INDEPENDENT VARIABLE:
Independent variable is the variable that is changed or manipulated in an experiment in order to bring about a response.DEPENDENT VARIABLE:
Dependent variable is the variable that is measured or recorded in an experiment.CONTROL VARIABLE:
Control variable or constant is the variable that is kept unchanged throughout the experiment. According to this question, a person conducts an experiment by counting the number of flowers she sees on different types of plants. She records data every week.In this experiment;
Independent Variable (IV) is the different types of plants because it was changed. Dependent Variable (DV) is the number of flowers because it is recorded. Control Group: NoneConstants: Duration/time of recordingLearn more about IV, DV and constant at: https://brainly.com/question/17498238?referrer=searchResults
ULUI HIGISTUU 2 3 5 6 7 8 A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal that has a density of 2.71 g/cm3was selected
Answer:
iiiiii<iiiiii
Explanation:
Answer:
4/J
Explanation:
Remember the triangle
m
v d
d=m/v
do this for the 4 questions.
1.7.36
2.10.5
3.1,846
4.2.71
so it would be 4
good luck!!!!
Are Elements on the Period Table of Elements?
Yes or No?
Answer:
Yes they are I guess so
:)
Answer:
Yes it is
Hope it helps
HOW MANY ATOMS DO THE REACTANTS HAVE? (602 + C6H1206)
Answer:
36
Explanation:
The O2 atoms have two atoms in them, and the glucose molecule has 24 atoms in them. Since there are 6 O2 atoms, there are 12 atoms. Add the number of atoms from the glucose molecule and the 6 oxygen atoms to get 36 atoms.
Which step in the scientific method requires you to use your senses to obtain information?
Answer:
The answer is Observation.
For you to observe the things around you then you need to use all your sense organs....
Answer: making an observation.
> So, to fill this shell, will it be easier for sodium to steal
seven more electrons from another atom, or will it be easier
for sodium to give up that one electron and get rid of that third
shell? Sodium is simply going to give away that last electron.
This means that it will lose an electron (negative charge) but
will keep the same number of protons (positive charges).
What will the sodium ion's overall charge be now?
40
- Exploring Anatomy & Physiology in the Laboratory
Answer:
+1
Explanation:
Sodium has one electron in its outermost shell. Sodium can not be able to accept seven electrons because the energy required for that process is very high. Sodium would rather loose its only valence electron to form a univalent positive ion Na^+.
This is an easier process. When sodium looses one electron, it now has a charge of +1.
A student describes the motion of particles in each of the four different states of matter
State 1: particles that are charged move freely
State 2: particles move freely at high speed
State 3: particles are locked in place
State 4: particles slide past one another
which state describes solids?
State 3: particles are locked in place describes the solid state exactly.
What is Solid State ?The physical characteristics of matter in which molecules or atoms are unable to move freely and are instead required to maintain their borders independently and in fixed connection to one another.
One of the four basic states of matter is solid.
The least energy molecules are those that form solids and are tightly grouped.
The solid's defining structural rigidity and resistance to external pressure.
Solids have precise mass, volume, and shape as well as compact arrangements of their constituent particles. Between molecules, there is not much intermolecular space.
Therefore, State 3: particles are locked in place describes the solid state exactly.
Learn more about Solid state here ;
https://brainly.com/question/27951509
#SPJ6
Why can't an atom lose or gain a proton?
You can compress a substances in the gas state, but not in the solid or liquid state. Use the particle theory to explain why？
Answer:
we can compress gas instead of liqued or solid because it contains a lot of space between its particles.
Explanation:
particles of gases are far apart from each other and there motion are irregular as well, due to the free free space gases can be expressed.
Which of the following is an example of chemical energy changing into radiant energy?
A. A fireplace glowing when lighted B. A plant using sunlight to make food C. A child on a swing slowing down as she swings upwards D. A coil of a toaster glowing when the toaster is switched on
Answer:
D. A coil of a toaster glowing when the toaster is switched on
Explanation: