Answer:
CH4 + 2O2 --> CO2 2H2O, Combustion Reaction
Explanation:
Which substance is an element that is composed of molecules?
A. water (H2O)
B. methane (CH4)
C. hydrogen (H2)
D. helium (He)
Answer:
the answer is hydrogen which is B
The substance is an element that is considerably composed of molecules known as hydrogen (H2). Thus, the correct option for this question is C.
What is a Chemical element?A chemical element may be defined as a species of an atom that remarkably bears a specific number of sub-atomic particles in its structure. These elements are not further decomposed into smaller components in a chemical reaction.
H2 is also known as molecular hydrogen. It forms when two hydrogen atoms are significantly bonded to one another in order to give rise to a molecule. Water is not an element, it is a molecule. While methane is a chemical compound that possesses a chemical formula CH4. Helium (He) is a chemical element only.
Therefore, hydrogen is an element that is composed of molecules. Thus, the correct option for this question is C.
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In a year an adult cow produces around 3.571 x 10^27 molecules of methane CH4 a greenhouse gas how many moles of methane does this cow produce in a year
Answer:
[tex]\boxed{\boxed {\sf 5930.0 \ mol \ CH_4}}[/tex]
Explanation:
We are asked to find how many moles of methane (CH₄) a cow produces in a year. We must convert molecules of methane to moles of methane. We will do this using Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance.
In this case, the particles are molecules of methane. There are 6.022 × 10²³ molecules of methane in 1 mole.
We will convert molecules to moles using dimensional analysis. Set up a ratio using Avogadro's Number.
[tex]\frac {6.022 \times 10^{23} \ molecules \ CH_4}{ 1 \ mol \ CH_4}[/tex]
We are converting 3.571 × 10²⁷ molecules of methane to moles, so we multiply the ratio by this value.
[tex]3.571 \times 10^ {27} \ molecules \ CH_4 *\frac {6.022 \times 10^{23} \ molecules \ CH_4}{ 1 \ mol \ CH_4}[/tex]
Flip the ratio. It is still the same value, but the units of molecules of methane cancel.
[tex]3.571 \times 10^ {27} \ molecules \ CH_4 *\frac { 1 \ mol \ CH_4}{6.022 \times 10^{23} \ molecules \ CH_4}[/tex]
[tex]3.571 \times 10^ {27} *\frac { 1 \ mol \ CH_4}{6.022 \times 10^{23} }[/tex]
[tex]\frac {3.571 \times 10^ {27}}{6.022 \times 10^{23} } \ mol \ CH_4[/tex]
[tex]5929.923613 \ mol \ CH_4[/tex]
The original measurement of molecules of methane( 3.571 × 10²⁷ molecules) has 4 significant figures, so our answer must have the same. For the number we calculated, that is the ones place. The 9 in the tenth place tells us to round the 9 in the ones place up to a 0, then the 2 in the tens place up to a 3.
[tex]5930 \ mol \ CH_4[/tex]
We must add a placeholder zero in the tenth place to reach 4 sig figs.
[tex]5930.0 \ mol \ CH_4[/tex]
The adult cow produces approximately 5930.0 moles of methane in a year.
which is the best interpretation of the two flat portions of the graph
A. These show where kinetic energy is increased
B. These show where temperature is at 0 Celsius
C. These show where thermal energy does not exist
D. These show were changes of state are occurring
Answer:
b
Explanation:
how we can separate sand and water with the help of evaporation.
Answer:
By filtering
Explanation:
Take one cup of mixture of sand and water , filter using a cotton cloth ,
Which of the following is a feature of a Type IV flotation device?
Answer:
A Type IV PFD is an approved device designed to be thrown to a person in the water. It is not designed to be worn. It is designed to have at least 16.5 pounds of buoyancy. The most com- mon Type IV PFD is a buoyant cushion.
plz help!!
fill in the blank
Answer:
0.0325m = 3.25 cm
Explanation:
1m = 10-²cm
Answer:
3.25cm
Explanation:
a centimeter is just 1/100 of a meter
Which of the following is an example of quantization?
A. The distance the ball is passed
O B. The fans sitting in the bleachers
C. The coach pacing the floor
O-D. The movement of basketball players on a court
The correct option is D The movement of basketball players on a court.
What is basketball ?Basketball exists as a team sport in which two teams, most generally of five players each, opposing one another on a rectangular court, contest with the primary objective of shooting a basketball (approximately 9.4 inches (24 cm) in diameter) through the defender's hoop (a basket 18 inches (46 cm) in diameter mounted 10 feet (3.048 m) high to a backboard at each end of the court, while controlling the opposite team from shooting through their hoop. A field goal stands worth two points unless made from behind the three-point line when it stands worth three. After a foul, timed play stops and the player fouled or selected to shoot a technical foul is assigned one, two, or three one-point free throws. The team with the most points at the end of the game wins, but if regulation play passes with the score tied, an additional period of play (overtime) exists mandated.
Hence, The correct option is D The movement of basketball players on a court.
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what happens when we mix stone in water observation
Answer:
hope it's help you dear
Explanation:
If one drops a stone into a pond, a very rapid, thin jet of water spouts upwards. ... A cavity forms behind the object during impact on the water surface. This cavity is subsequently compressed by hydrostatic pressure, which leads to the formation of the jet
Why do you think the mass of the carbon atom shown is 12 atomic mass units (amu)?
Answer:
The mass of Carbon-12 is exactly 12 amu. But, that is not the number that is reported in your periodic table. Carbon as it exists in nature is not all carbon-12. There is some small amount of carbon-13 and even traces of carbon-14 in there. The periodic table reports the average mass of the carbon as it is found in nature, not that of pure carbon-12. The average mass of carbon is slightly heaver than carbon-12, because of the slight amounts of those heaver isotopes of carbon in nature.
Mark me as brainliest please
Explanation:
If you know the atomic number of an element, what information does it give you about neutral atoms of that element?
Answer:
electrons
Explanation:
the atomic number tells you the number of Drotons in one atom of an element.It also tells you the number of electrons in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the periodic table.
What is the SI unit for energy? How is it abbreviated?
Answer:
Joule - J
Explanation:
As energy is defined via work, the SI unit of energy is the same as the unit of work – the joule (J).
6. Heat from the sun reaches to us by
(a) radiation
(b) conduction
(c) convection
(d) all of these
PS. the one who gets it correct will be followed by me and also be marked as the brainliest!
Answer:
radiation
....
.
.
.
.hi how r u
Is my answer correct
Answer:
Radiation
Explanation:
Heat from the sun reaches is by the process of radiation
which atom can gain electrons lose electrons and how many ? if sodium is -2,8,1/and chlorine is -2,8,7
Answer:
A sodium atom can lose its outer electron. It will still have 11 positive protons but only 10 negative electrons. So, the overall charge is +1.
A major component of gasoline is octane . When octane is burned in air, it chemically reacts with oxygen gas to produce carbon dioxide and water . What mass of octane is consumed by the reaction of of oxygen gas
1044.987 Rounded to three significant figures
Answer: 1040 or 1.04 × 103
Explanation:
Depending on if you need to write it in scientific notation.
Hope this helps!
Why is the top ruler more reliable in measuring length than the bottom ruler?
Answer:
cause the bottom part starts at 0 and the top starts at 12
Explanation:
Which of the following atoms is expected to have two unpaired electrons?
Al
Mg
Na
None of the above
Answer:
none of the above answers
When you pump a bicycle tire, what is happening to the particles inside the tire?
Answer:
they become more compressed with each other, forming a higher-pressure environment.
Explanation:
:)
When you pump air into the tire, it compresses the air, bringing the molecules in the air closer together.
Explanation:
A carboxylic acid is an organic acid based on the carboxylate functional group, −COO−−COO−. The pKa of acetic acid, CH3COOHCH3COOH, is 4.80. The pKa of chloroacetic acid, CH2ClCOOHCH2ClCOOH, is 2.99. The pKa of trichloroacetic acid, CCl3COOHCCl3COOH, is 0.79 Acetic acid diluted in water is known as vinegar, which is safe for many food, cleaning, and alternative health applications. The other two acids are quite hazardous to our health in addition to being stronger acids, and their reactivity makes them useful as reagents in organic synthesis. Let us consider what accounts for the increased acidity and how to test those hypotheses.
Consider what trend exists in the pKapKa values for these three carboxylic acids based on their molecular formulas, then complete the following statement regarding a trend that relates to this phenomenon.
The pKa values of the carboxylic acids tend to decrease as the ___ increases.
In order for a wave to be affected by a polarized lens, it must be a
a. Transverse wave
b. Longitudinal wave
c. Surface wave
d. Electromagnetic wave
Answer:
the answer is transverse wave
A bike lost 20% of its value after the first year, its value after the first year is $1039. Calculate the original price of the bike?
Answer:
$1246.90
Explanation:
Since the bike lost [tex]20%[/tex]% of it's value and it now currently at $[tex]$1039[/tex], we have to do 20% * $1039 to find the amount of money lost. 20%*1039=207.8. We have to add it up to find the original value so 1039+207.8=$1246.8
balanced equation for the decomposition by heating of iron(II) sulfate heptahydrate
The balanced equation for the decomposition by heating of iron(II) sulfate heptahydrate is FeSO₄.7H₂O —> FeSO₄ + 7H₂O.
What is a balanced equation?An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and the total charge for each component of the reaction. In other words, both sides of the reaction have an equal balance of mass and charge.
Here, in the equation FeSO₄.7H₂O —> FeSO₄ + 7H₂O
There is one molecule of iron is given on both sides and seven molecules of water given on both sides. So this equation is balanced. When there are similar molecules present on both sides. If the count on both sides is equal then this is called a balanced equation.
Thus, the balanced equation is FeSO₄.7H₂O —> FeSO₄ + 7H₂O.
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What is the volume of 12.0 gof a liquid with a density of 1.37 g/mL?
How can the Swartz process be modified to work for bacteria?
Answer:
https://swartzbiotechnologylab.sites.stanford.edu/research
Explanation:
I need help on this question plzzz
Answer:
76 ml
0.076 L
Explanation:
hope that helps
Answer:
76 for the first one at least I think
Explain why there was a reaction between zinc metal and a salt solution of copper sulphate please help me
Answer:
When zinc is added to copper sulphate (CUSO4) solution due to more reactivity of zinc, cooper is replaced by the zinc and forms zinc sulphate. During the process, the colour of the solution changes from blue to colourless.
Rocephin® is an antibiotic sometimes used to treat skin infections. In children, the maximum recommended daily dose of this medicine is 75 mg/kg of body mass. Express this dosage in g/lb, using the conversion 1 kg=2.20 lb.
A daily dose of 75 mg/kg of body mass of Rocephin® is equivalent to 0.034 g/lb of body mass.
In children, the maximum recommended daily dose of this medicine is 75 mg/kg of body mass. First, we will convert this dose to g/kg of body mass using the conversion factor 1 g = 1000 mg.
[tex]\frac{75 mg\ Rocephin}{kg\ body\ mass} \times \frac{1 g\ Rocephin}{1000 mg\ Rocephin} = \frac{0.075 g\ Rocephin }{kg\ body\ mass}[/tex]
Then, we will convert the dose of 0.075 g of Rocephin/kg of body mass to g of Rocephin/lb of body mass using the conversion factor 1 kg = 2.20 lb.
[tex]\frac{0.075 g\ Rocephin }{kg\ body\ mass} \times \frac{1kg\ body\ mass}{2.20lb\ body\ mass} = \frac{0.034 g Rocephin}{lb\ body mass}[/tex]
A daily dose of 75 mg/kg of body mass of Rocephin® is equivalent to 0.034 g/lb of body mass.
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The reaction X - Y has a reaction enthalpy of - 64 kJ moJ-1 and an activation energy of 22 kJ moJ^-1. What is the activation energy for the y -> x reaction?
Answer:
?
Explanation:
I'm very sorry I couldn't get you a answer, I haven't learned this in school.
At least not this stuff, my apologies!
what is the formula of water
Answer:
H2O is the formula of water
Answer:
H²O is formula of water
Explanation:
2 molecule of hydrogen and 1 molecule of oxygen
How did Mendeleev come up with the first periodic table of the elements? (1 point)
A He determined the mass of atoms of each element.
B He estimated the number of electrons in atoms of each element.
C He arranged the elements by different properties to find a pattern.
D He organized the elements by their atomic number.
Mendeleeve's periodic table was based on the atomic mass of each element.
The correct answer is option A: He determined the mass of atoms of each element.
The periodic table can be described as a regular arrangement of elements based on some periodic properties. The periodic table has evolved through the ages. Its patter has been changed several times before it arrived at its present form.
The Mendeleev periodic table was based on the mass of atoms of the elements. This table was published in Russia in 1869. His table even predicted elements that were yet to be discovered.
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Answer:
1. He arrange the elements by different properties to find a pattern!
Here are the rest!
2.. atoms are indivisible
3. He determined the amount of charge on an electron
4. Like charges repel and opposite charges attract
5.Alpha particle deflection
Hope this helps the ballers!