Answer:
Compound
Explanation:
This is because it made up of two elements that's is hydrogen and oxygen in the ratio of 2:1 respectively
Answer:
Compound
Explanation:
H2O isn't on the periodic table so it's not an element. H2O isn't a molecule because it's water. H2O isn't a mixture because it can't be seperated. So, it must be a copound.
why do scientists classify the brown algae and paramecium are both protists
Are the following chemical equations balanced or
Balanced / Onbalanced
.
CH4 + 4Cl2 → CCL + 2HCL
Balanced / Unbalanced
N2 + 3H2
2NH3
Balanced / Unbalanced
C3H2 + 302 + 3CO2 + 4H2O
+
Answer:
the first is unbalanced
because the number of hydrogen are not equal on both sides
the second one is balanced
because the number of nitrogen and hydrogen atoms are equal on both sides
and the third one seems to be incomplete
Which of the following are said to be physical properties of gases?
Select one:
a.
The atoms or molecules of a gas are relatively far apart.
b.
A gas expands to fill the space in a closed container.
c.
A gas is easily compressed.
d.
All of the above.
e.
Answers A and B only.
Answer:
Gases have three characteristic properties: (1) they are easy to compress, (2) they expand to fill their containers, and (3) they occupy far more space than the liquids or solids from which they form.
SO the answer is- D. All of the above
Explanation:
When common salt sodium chloride is dissolved in water sodium and chloride – not formed
Answer:
they do not separate to form lumps of sodium metal or to form chlorine gas.
Explanation:
While it's true that when a crystal of the ionic substance sodium chloride is dissolved in water the sodium and chloride ions separate from one another, they do not separate to form lumps of sodium metal or to form chlorine gas. Rather, they remain as single Na+ and Cl− ions, surrounded by water molecules
The following acid-base reaction occurs spontaneously in the gas phase: NH₃(g) + HCl(g) ⇌ NH₄Cl(s) During an experiment, 10. 00 g of solid NH₄Cl was added to a 500. 0 mL flask at 25. 0°C. The equilibrium constant for this reaction at this temperature is 8. 9 × 10¹⁵, determine the partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium
The partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium is mathematically given as
PH3=1.06*10^{-8}atmPHCl=1.06*10^{-8}atmWhat is the partial pressures (in atm) of NH₃ and HCl after the reaction reaches equilibrium?Question Parameter(s):
Generally, the equation for the Chemical Reaction is mathematically given as
HCl(g) ⇌ NH₄Cl(s)
Therefore
[tex]Keq=\frac{1}{PH3*PHC}[/tex]
PH3*PHCl=1.23*10^16
Therefore
P^2=1.23*10^{-16}
P=1.06*10^{-8}
In conclusion,
PH3=1.06*10^{-8}atm
PHCl=1.06*10^{-8}atm
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4. Which of the following compounds is
molecular?
A. NaF
B. Al3PO4
C. CO2
D. KC1
Answer:
CO2(C)
Explanation:
This is because there is a mutual sharing of electrons between the atoms or elements...That's to say covalent bond exist between them.
How many moles are in 2.3 g of NaHCO3? Answer should have 3 digits after the decimal and a unit.
Answer: 0.027 moles
Explanation:
Ecosystem 8L.3. 1-2 1 1 of 25
Which is the BEST example of a community responding to an external factor?
A. Plants and animals thrive on the forest floor after the fall of a white pine causes an opening in the canopy.
B. Many species of raptors fly alongside each other during the autumn migration to warmer climates.
C. Elephants use their tusks to dig the salt needed in their diets from the wall of a cave.
• D. Adult musk oxen in a herd surround their young to protect them from wolves.
Answer:
Adult musk oxen in a herd surround their young to protect them from wolves.
Answer:
D
Explanation:
Which of the following is a biotic part of an environment?
mud
clams
sunshine
rocks
Answer:
sunshine
Explanation:
because it's light u get it from the ecosystem
Answer:
sunshine is your correct answer
Abiotic factors are non-living things that "live" in an ecosystem that affect both the ecosystem and its surroundings. Some examples of Abiotic factors are the sun, rocks, water, and sand. Biotic factors are living organisms that affect other living organisms.
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7. What assumption of the kinetic-molecular theory explains why a gas can expand to fill a container?
Answer:
Gas molecules move at random with no attractive forces between them.
Explanation:
Kinetic-molecular theory is based on the following postulates, or assumptions.
Gases are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion.
These particles move in a straight line until they collide with another particle or the walls of the container.
These particles are much smaller than the distance between particles. Most of the volume of a gas is therefore empty space.
There is no force of attraction between gas particles or between the particles and the walls of the container.
Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.
The average kinetic energy of a collection of gas particles depends on the temperature of the gas and nothing else.
Which of the following will dissolve in water?
Help quickly please picture is attached
option b mg2 magnesium dissove in water
4. Use the chemical equation to answer the question.
4K(s) + O2(g) → 2K2O(s)
The molar mass of potassium (K) is 39 g/mol. The molar mass of oxygen (O) is 16 g/mol. How many grams of potassium are needed in the reaction to produce 23.5 grams of potassium oxide (K2O)?
A 23.5 g
B 9.75 g
C 0.50 g
D 19.5 g
The amount, in grams, of potassium that would be needed to produce 23.5 grams of potassium oxide will be 19.5 grams
Stoichiometric calculationFrom the equation, the mole ratio of K to K2O is 2:1.
Mole of 23.5 K2O = mass/molar mass
Molar mass of K2O = 39x2 + 16 = 94
Mole of 23.5 K2O = 23.5/94 = 0.25 moles
Equivalent mole of K = 0.25 x 2 = 0.5 moles
Mass of 0.5 mole K = 0.5 x 39 = 19.5 grams
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Answer: Calculating mass quick check
1. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.
2. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.
3. 2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g
4. 19.5 g
5. 853.5 g
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Which of the following can be beaten into thin sheets?
A. Zinc
B. Phosphorus
C. Sulphur
D. Oxygen
The purpose of a titration, such as
that done in the hard water lab, is to
Answer:
to detect equivalence point.
Explanation:
the point at which chemically equivalent amounts of reactants have been mixed.
Find the liters of 1.112 moles of CO
Answer:
24.9
Explanation:
Answer:
should be 22.4L
Explanation:
Can you post all the answers for "Specific Mass Conversions Quick Check"
1. How does stoichiometry support the law of conservation of mass?(1 point)
2.Nitrogen gas and hydrogen gas react to produce ammonia according to the following equation.
N2 + 3H2 → 2NH3
Which ratio of components is correct?
Answer:
#1: The law of conservation of mass underpins the principles of stoichiometry. Because matter cannot be generated or destroyed, the mass of each element present in a chemical reaction's product(s) must be equal to the mass of each element present in the reactant (s).
#2: 3molH2:2molNH3
Explanation:
Question 1:
Stoichiometry allows us to make predictions about the outcomes of chemical reactions. Making useful predictions is one of the main goals of science, the other being the ability to explain phenomena we observe in the natural world.According to the Law of Conservation of Mass, in "ordinary" chemical reactions, mass is neither created nor destroyedStoichiometry deals with the chemical quantities of a BALANCED chemical equations.The following is an example of an unbalanced equation and we can see why it does NOT follow the law of conservation of mass.H2O (l) ⇒ H2 (g) + O2 (g)From the equation above, it appears that you begin with 2 hydrogen atoms and form 2 hydrogen atoms. That's just fine. BUT, you cannot begin with 1 oxygen atom and end up with 2 oxygen atoms on the product. This is a violation of the Law of Conservation of Mass.Below, you will find the balanced equation for this reaction which DOES follow this law.2 H2O (l) ⇒ 2H2 (g) + O2 (g)In the above example, you begin with 4 hydrogen atoms and produce four hydrogen atoms; you start with 2 oxygen atoms and end with 2 oxygen atoms.The coefficients needed to balance this chemical equation tell you the ratios that the reactants and products exist in; stoichiometry deals with the quantities of balanced equations.---------------------------------------------------------------------------------------------------Question 2:
In order to determine the mole ratio, we need to begin with a balanced chemical equation.For this reaction the balanced chemical equation isN2 + 3H2 ⇒ 2NH3The mole ratios are determined using the coefficients of the substances in the balanced chemical equation.1 moln: 3mol2 : 2molNH3The mole ratios for each substance pair would be1molN2: 3molH21molH2/3molH2 or 3molH2/1molN21molN2:2molNH31molN2/2molNH3 or 2molNH3/1molN23molH2:2molNH33molH2/2molNH3 or 2molNH3/3molH2what happens to a pendulum’s kinetic energy as the pendulum comes to a stop.
On the other end of the swing, the kinetic energy begins to change back into potential energy. The pendulum then comes to a complete stop! At the end of each swing, it comes to a complete stop for a brief moment. When the energy is "at rest," it is once again potential energy.
GIVING BRAINLY
a balloon contains 2.5 L of air at 1.00 atm. it is taken underwater to a new pressure of 4.00 atm. what id the new volume? round to 2 decimal places
What does the law of reflection state?
A. The angle of incidence is greater than the angle of refraction.
B. The angle of incidence is equal to the angle of reflection.
O C. The angle of incidence is greater than the angle of reflection.
D. The angle of incidence is equal to the angle of refraction.
Answer:
B is the correct answer
A given volume of methane diffuses in 20 seconds. How long will it take the same volume of hydrogen to diffuse under the same conditions? [CH4 = 16; H2 = 2]
The time taken for the same volume of methane gas to diffuse is 7.1 s.
Rate of gas diffusionThe rate at which a given mass of diffuses is inversely proportional to the molar mass of the gas.
[tex]\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }[/tex]
where;
M1 is the molar mass of methane (CH4) = 16 gM2 is the molar mass of hydrogen as = 2t1 is time taken for methane = 20 st2 is the time taken for hydrogen = ?[tex]\frac{t_2}{t_1} = \sqrt{\frac{M_2}{M_1} }\\\\\frac{t_2}{20} = \sqrt{\frac{2}{16} }\\\\\frac{t_2}{20} = \frac{\sqrt{2} }{4} \\\\t_2 = \frac{20\sqrt{2} }{4} \\\\t_2 = 5\sqrt{2} \\\\t_2 = 7.1 \ s[/tex]
Thus, the time taken for the same volume of methane gas to diffuse is 7.1 s.
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The time it takes for hydrogen to diffuse is 7.07 seconds
Graham's law of diffusionTo calculate the time it will take hydrogen gas to diffuse, we use the formula from Graham's law of diffusion.
Formula:
T'/T = √(M'/M)........... Equation 1Where:
T' = Time taken for menthane to diffuseT = Time take for hydrogen to diffuseM' = Relative molecular mass of menthaneM = Relative molecular mass of hydrogen.Make T the subject of the equation
T = T'/[√(M'/M)]................ Equation 2From the question,
Given:
T' = 20 secondsM' = 16M = 2Substitute these values into equation 2
T = 20/[√(16/2)]T = 20/[√(8)]T = 20/(2.828)T = 7.07 secondsHence, The time it takes for hydrogen to diffuse is 7.07 seconds.
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what are of study in chemistry is concerned with the heat changes that occur during chemical reactions?
Answer:
Thermochemistry
Explanation:
Thermochemistry is the area of study in chemistry that is concerned with the heat transfers that occur during chemical reactions.
Hope this helps.
HCl + CaCO3 → CaCl2 + H2O + CO2 balanced equation
Pls Help i will give 100 Points!!!
[tex]\\ \rm\rightarrowtail 2HCl+CaCO_3\longrightarrow CaCl_2+H_2O+CO_2[/tex]
On both sides
H=2O=3Ca=1C=1Hence balanced
what is polyatomic?..
Answer:
The term poly implies many, so a polyatomic particle is a particle that contains more than one atom. Hence it is not the same as monatomic particles, which contain just a single iota. Instances of monatomic particles incorporate Na+ and Cl-
Answer:
The ions which contain more than one atoms behaving as a single unit are called polyatomic ions. For example, PO43−,CO32−
Explanation:
The graph shows the average number of striped bass caught near a dam built in 1958. Which statements are supported by this data?
A
The dam is causing the numbers of striped bass to decrease.
B
The greatest number of striped bass were seen in this area in the 1980’s.
C
The number of striped bass at this location has decreased since the data collection began.
D
The greatest decrease in total number of bass in the region occurred between 1988 and 1989.
E
There is a correlation between the number of striped bass and the amount of time the dam has been in operation.
Badrd on the graph provided, it can be concluded that:;
The dam is causing the numbers of striped bass to decrease.How does human activities impact wildlife population?Human activities have on the most part affected wildlife negatively.
Humans activities such as construction of dams across rivers have being demonstrated to negative affect the habitat and hence the population of aquatic organisms in the area.
The data shown on the graph shows a steep decrease in the population of the striped bass after the construction of the dam in 1958.
Therefore, it can be concluded that the population of the striped bass has been on a steady decline since 1958.
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What volume of concentrated 18M solution is required to prepare 550 mL of a 2. 0M solution?
Explanation:
L&L previews exhibitors and their products on show at the latest installment of the leading label and package printing trade show, Labelexpo Europe 2017.
Labelexpo Europe 2017 takes place September 25-28 in Brussels, Belgium, and is set to be the biggest edition in the show's history.
As well as the below exhibitor-by-exhibitor preview, read Andy Thomas' opinion article on how Labelexpo Europe is broadening its horizons in 2017, and L&L editor James Qurk's leader from issue 4 on how boundaries are shifting and the term 'label' is being redefined. There's also a look at the new Automation Arena feature area debuting at Labelexpo Europe this year, and a lowdown on the Label Industry Global Awards 2017 finalists, also reported here, plus more on the new FoodSaveUV industry group that proposes food safe UV certification. And if you missed the pre-show webinar, catch up with it here.
Further, see the image gallery below for visual highlights of what will be presented on the show floor at Labelexpo Europe 2017.
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What is the chemical formula for ammonia, according to this illustration?.
Answer:
Ammonia is a chemical compound used as a fertilizer because it is rich in nitrogen. Its chemical formula is NH3, which means that it consists of one atom of nitrogen and three atoms of hydrogen per molecule.
A chemical formula is a symbolic representation of a chemical compound. It tells us about the number of atoms present in the compound. The chemical formula of ammonia is NH₃.
What is ammonia?An inorganic compound which is composed of nitrogen and hydrogen with the formula NH₃ is called the ammonia. It is a colourless gas with pungent smell. It is lighter than air and it can be easily liquified due to the strong hydrogen bonding between the molecules.
In ammonia there are 3 bond pairs and one lone pair around the central nitrogen atom. According to VSEPR theory, these tend to stay as far apart as possible to minimize mutual repulsion. Hence they arrange themselves in tetrahedral manner.
However due to the lone pair of electrons, the actual geometry of the molecule is trigonal pyramidal. One of the most important feature of ammonia is that it is a weak base.
Thus the chemical formula of ammonia is NH₃.
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Can I get a rebuttal on why humans are better to send to space than humans.
Answer:
both are humans
Explanation:
so what on earth are you talking about?
Answer:
Do you mean why animals are better to send to space than humans? Animals do not comprehend what is going on so they are not worried or scared to die in space. They also do not have the same level of IQ as humans so humans are worth more if you saw it from that point of view. I know this can be debated however.
\\
Ok I see you posted a comment saying "Robots"
Robots will not die if there is an explosion because AI does not have a mind of it's own.
What is the Mr of a substance where 1 mole has a mass of 11 g?
Answer:
A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly
12 grams of carbon-12 (i.e., 6.023 X 1023).
Explanation:
which of these is not a function of the digestive system
A) break down food
B) absorb nutrients
C)synthesis of insulin
D)synthesis of vitamin K
Answer:
C
Explanation:
I believe it is C but don't take my advice 100%.
Please help
Science....
Thanks
Answer:
docx it is a science document