Answer:
muscular jumping leg (helps them escape predators, chase after prey), webbed foot (helps them live in both aquatic and land environments), and they can store poison (that is used to attack or defend) in their glands
Explanation:
:)
Which statement best describes how chemical equations demonstrate conservation of mass?
Lavoisier's Law states:
'Mass is neither created nor destroyed' in chemical reactions.
Fill in the coefficients that will balance the following reaction:
__C₂H₂+__O2–>__CO2 +__H2O
Explanation:
C3H8 + 5O2 -> 3CO2 + 4H2O
C2H2 + 2.5O2 -> 2CO2 + H2O
Gravity affects the of an object but not its .
Answer:
weight, mass
Explanation:
Gravity affects the weight of an object but not its mass. Your body's weight can change on different planets, but your mass will ALWAYS stay the same.
Answer:
Gravity affects the weight of an object but not its mass.
Explanation: plato :3
Hope this helps!
given a mixture of aluminium chloride,zinc carbonate and barium nitrate briefly explain how you can obtain a pure sample of each
Answer:
electrolysis or iron extraction in the trunk furnace
How many sodium ions are in 58.5 grams of sodium chloride?
Answer:
NaCl contains 12.046 x 1023 ions.
Explanation:
:p
Convert 4.0 moles of N2 gas to liters.
Convert 4.0 moles of N2 gas to liters.
Answer :-1mole = 22.4 lts of any gas
unitary method :-
so we can say 4 moles = 4 × 22.4 lts of gas
4 moles of N2 gas = 89.6 lts of N2 gas
What is the reason of formation of millions of organic compound
What is the most reliable measurement for the quantity of matter?
Answer:
Answer is: mass.
Explanation:
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Which organism is part of Kingdom Fungi? ciliates lichen paramecium slime molds
Answer:
Slime.
Once upon a time, slime was part of the fungi kingdom. Now it's not, according to experts.
Hope this helps!
What is energy, and what is its unit of measure?
Answer:
Energy is measured in joules. And it is a derived unit. An example that you use in energy is horsepower.
On the web an easy definition: Kinetic energy is motion; it is the motion of waves, electrons, atoms, molecules, substances, and objects.
Also, everything consists of energy. For example, when you turn a page from a book, that is using energy. Or when a ball is rolling down a ramp, it is using kinetic energy. You can also have potential energy, which is the energy stored in something when it isn't moving. For example, when the ball is about to roll on the ramp, it is in its starting point with potential energy.
And finally elastic energy:
Elastic energy is the mechanical potential energy stored in the configuration of a material or physical system as it is subjected to elastic deformation by work performed upon it. Elastic energy occurs when objects are impermanently compressed, stretched or generally deformed in any manner.
For example, an elastic string. When you stretch it, it is the potential anergy stored in the string you are stretching. When you release it, it flies in the air and changes to kinetic energy.
Answer:
Energy is the ability to do work (Quantitative property that must be transferred to an object to perform work on)
Measured in Joule(s)
3. What will you observe (the dependent variable) as a result of that change?
Lithium, sodium, and potassium are Group I metals. Explain why these metals cannot be extracted from their ores by heating the ores with carbon.
Answer:
Explanation:
Metals in the top of the reactivity level i.e. metals like sodium, magnesium, calcium, etc cannot be obtained from their compound by heating with carbon as they are very reactive. Electrolytic reduction is used to obtain such metals.
Which of the following statements explains why the bond in
hydrogen chloride (HCI) is polar covalent?
o The diameter of a chlorine atom is greater than that
of a hydrogen atom.
o The atomic mass of chlorine is greater than that of
hydrogen.
o The number of valence electrons in a chlorine atom
is greater than that in a hydrogen atom.
o The electronegativity of chlorine is greater than that
of hydrogen.
Answer:
The atomic mass of chlorine is greater than that of hydrogen
The temperature of aluminum increases from 30.0 to 38.0 °C and absorbed 900.J. Calculate the mass of aluminum used if the specific heat is 0.902 J/gK.
please help!!!!
Answer:
The mass of aluminum is 124.72 g
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of energy that causes a change in the temperature of a substance. In other words, sensible heat is that heat that causes the temperature of an object to vary without affecting its molecular structure and therefore its physical state. Its mathematical expression is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
Q= 900 Jc= 0.902 [tex]\frac{J}{g*K}[/tex]m= ?ΔT= Tfinal - Tinitial= 38 °C - 30°C= 8°C as it is a temperature difference, it is indistinct if the temperature is expressed in ° C or ° K because the difference will be the same. So: ΔT= 8°C= 8 °KReplacing:
900 J= 0.902 [tex]\frac{J}{g*K}[/tex] *m* 8 °K
900 J= 7.216 [tex]\frac{J}{g}[/tex] *m
[tex]\frac{900 J}{7.216\frac{J}{g} } =m[/tex]
124.72 g=m
The mass of aluminum is 124.72 g
What air pollutants can result from burning fuelwood?
Answer:
These air pollutants consist of...
Carbon monoxideNitrogen oxidesClimate changeFossil fuelsOrganic compounds. Just because they are organic does not mean they are good for the environment.
Use the oxidation states as indicated by the superscript numbers to answer the questions. k( 1)cl( 5)o3(-2) → k( 1)cl(-1) o2(0) which element is oxidized? which element is reduced? which element does not change in the oxidation state? how many electrons will be moved to have a balanced reaction?
Oxygen gets oxidized and potassium and chlorine get reduced. The number of electrons moving to have a balanced reaction is 6.
What is an oxidation number?The number of allocated elements in a chemical combination is termed an oxidation number. The oxidation number is generally the count of the number of electrons that a molecule or atom shares, loses, or gains during bond formation.
The given chemical equation will be
[tex]\rm 2K ^+ + 2Cl^+ + 2O_3^{2-} = 2KClO_3[/tex]
In this reaction, oxygen gets oxidized and potassium and chlorine get reduced.
The number of electrons moving to have a balanced reaction will be
Number of electron = 2 × 3 = 6
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Answer:
Answer down below
Explanation:
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Which one is a process in which water changes into vapours in atmosphere?
(a) Evaporation
(b) transpiration
(c) Precipitation
(d) condensation
Answer:
a
Explanation:
32.2 g of ethyl alcohol is dissolved in water to make a 0.50 L
solution. What is the molarity of the solution?
If 32.2 g of ethyl alcohol is dissolved in 0.50 L water to make a solution, the molarity of the solution will be 1.398 mol/L or 1.398 M
Molarity
The molarity of a solution is the ratio of the number of moles of solutes and that of the volume of solvent in the solution.
Mathematically:
Molarity = number of moles/volume in L
Number of moles of 32.2 g ethyl alcohol = mass/molar mass
= 32.2/46.07 = 0.699 moles
Molarity of the solution = 0.699/0.50
= 1.398 mol/L or 1.398 M
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Stoichiometry Stumper
You are a forensic scientist. You are investigating a murder involving poison. The victim was poisoned with a compound called di-chloro benzene whose formula is C6H4Cl2. Autopsy results show that the victim’s body contained about 31 g of the poison, but the actual amount could have been slightly higher due to tissue absorption. The main suspect is his wife, Suzanne, who works as a chemistry professor at the local university. Records show that she purchased 15 g of benzene (C6H6) two days before the murder. Benzene is one of the compounds used to make the poison, but she claims she was using it to make ethyl benzene (C6H5CH3), an innocuous compound, for use in her lab. She shows you the bottle of ethyl benzene she claims to have made. It contains 25 grams of ethyl benzene.
Is she telling the truth or did she have more nefarious motives? If you can show that it is possible to produce 25 g of ethyl benzene from 15 grams of benzene, then she was telling the truth. Otherwise, you will have caught her in a lie, which makes it likely she killed her husband with the poison. After extensive research in the literature, you find the two reactions related to this case. Show all work.
From the calculation, Suzanne is lying and she is guilty of killing her husband.
What is stoichiometry?Stoichiometry provides a means of calculating the relationship between mass and mole or mole and volume in a reaction.
Now the preparation of ethylbenzene goes according to the reaction;
C6H6 + C2H6 ---->C6H5C2H5 + H2
Number of moles of benzene = 15 g/78 g/mol = 0.192 moles
Number of moles of ethyl benzene= 25 g/106 g/mol = 0.236 moles
Since the reaction is 1:1, 0.192 moles of ethyl benzene is produced.
Mass of 0.192 moles of ethylbenzene = 0.192 moles * 106 g/mol = 20.4 g
Suzanne is lying.
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what is galvanic or voltaic cell?
Answer:
An electrochemical cell that converts the chemical energy of spontaneous redox reactions into electrical energy is known as a galvanic cell or a voltaic cell. Galvanic cell Voltaic cell is an electrochemical cell that makes use of chemical reactions to generate electrical energy....
HOPE THIS HELPS, HAVE A GREAT DAY!!
Explanation:
Answer:
A galvanic cell or voltaic cell, named after the scientists Luigi Galvani and Alessandro Volta, respectively, is an electrochemical cell in which an electric current is generated from spontaneous Oxidation-Reduction reactions.
From internet..hope it helps you:)
Explanation:
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Complete and balance the following oxidation-reduction reaction in basic solution
The balanced oxidation-reduction reaction in basic solution is:
6 ClO⁻(aq) + 2 Cr(OH)₃(s) ⇒ 3 Cl₂(g) + 2 OH⁻(aq) + 2 CrO₄²⁻(aq) + 2 H₂O(l)
What is an oxidation-reduction reaction?An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.
Let's consider the following unbalanced redox reaction.
Cr(OH)₃(s) + ClO⁻(aq) ⇒ CrO₄²⁻(aq) + Cl₂(g)
We will balance it using the ion-electron method.
Step 1. Identify both half-reactions.Reduction: ClO⁻(aq) ⇒ Cl₂(g)
Oxidation: Cr(OH)₃(s) ⇒ CrO₄²⁻(aq)
Step 2. Perform the mass balance by adding H₂O and OH⁻ where necessary.2 H₂O(l) + 2 ClO⁻(aq) ⇒ Cl₂(g) + 4 OH⁻(aq)
5 OH⁻(aq) + Cr(OH)₃(s) ⇒ CrO₄²⁻(aq) + 4 H₂O(l)
Step 3. Perform the charge balance adding electrons where necessary.2 H₂O(l) + 2 ClO⁻(aq) + 2 e- ⇒ Cl₂(g) + 4 OH⁻(aq)
5 OH⁻(aq) + Cr(OH)₃(s) ⇒ CrO₄²⁻(aq) + 4 H₂O(l) + 3 e-
Step 4. Multiply both half-reactions by numbers that make the number of electrons gained and lost to be the same. Then, add them.3 . (2 H₂O(l) + 2 ClO⁻(aq) + 2 e- ⇒ Cl₂(g) + 4 OH⁻(aq))
2 . (5 OH⁻(aq) + Cr(OH)₃(s) ⇒ CrO₄²⁻(aq) + 4 H₂O(l) + 3 e-)
-----------------------------------------------------------------------------------
6 H₂O(l) + 6 ClO⁻(aq) + 6 e- + 10 OH⁻(aq) + 2 Cr(OH)₃(s) ⇒ 3 Cl₂(g) + 12 OH⁻(aq) + 2 CrO₄²⁻(aq) + 8 H₂O(l) + 6 e-
6 ClO⁻(aq) + 2 Cr(OH)₃(s) ⇒ 3 Cl₂(g) + 2 OH⁻(aq) + 2 CrO₄²⁻(aq) + 2 H₂O(l)
The balanced oxidation-reduction reaction in basic solution is:
6 ClO⁻(aq) + 2 Cr(OH)₃(s) ⇒ 3 Cl₂(g) + 2 OH⁻(aq) + 2 CrO₄²⁻(aq) + 2 H₂O(l)
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The compound ammonium bromide is a strong electrolyte. Write the reaction when solid ammonium bromide is put into water:
Answer:
NH4+ + H2O ==> NH3 + H3O+
Explanation:
Ammonium bromide, NH4Br, is the ammonium salt of hydrobromic acid. The chemical crystallizes in colorless prisms, possessing a saline taste; it sublimes on heating and is easily soluble in water.
1. Find at least 3 elements named after countries
2. Find at least 3 elements named after scientists (and name the scientist)
3. Find 1 element named after a state and 1 after a continent
4. Find 3 elements named after planets
5. Find 1 element that sounds like your name and 1 that sounds like it should be in a comic book
6. Find atleast 5 elements whose symbols do not match their names
7. What is the only letter not appearing on the periodic table as a symbol or part of the symbol?
8. Find the element that makes plumbing pipes. is it a medal, nonmetal or metaloid
9. Find the element that makes glowing signs, what special group is it in?
10. Find the element that makes milk good for your health. is it a metal, nonmetal or metalloid?
Answer:
1. Elements named after Countries or Places
Americium
Am
Made in 1945 at Chicago USA
Berkelium
Bk
Made in 1950 at the University of California, Berkeley, USA
Californium
Cf
Made in 1950 at the University of California, Berkeley, USA
Copper
Cu
The Romans were the biggest users of copper. Their source of copper was the island of Cyprus. Their name for the island was "Cyprium". They called the metal "Aes Cyprium" - metal of Cyprus. The name became shortened to Cyprium which then became "Cuprum" from which copper gains its modern day symbol.
Francium
Fr
Discovered in 1939 at the Curie Institute, Paris, France.
Gallium
Ga
Named after the Latin name for France - Gallia
Germanium
Ge
Discovered in 1886 by a German Chemist - Winkler.
Polonium
Po
Discovered in 1898 by Marie Curie, who was Polish.
Scandium
Sc
Discovered and mined in Scandinavia
Strontium
Sr
Named after Strontian, a small village in the Western Highlands of Scotland.
__________________________________________________________
4. Elements named after Planets
Helium
He
From the Greek word "Helios" - the Sun. In 1868 during an eclipse of the Sun, Scientists observed a spectral line caused by an unknown element. They named the element Helium. Twenty seven years later in 1895, the element was discovered on Earth.
Neptunium
Np
Named after the planet Neptune. Find the position of the three planets Neptune, Pluto, and Uranus in the Solar system. Now find the position in the Periodic Table of the three elements named after these planets...
Plutonium
Pu
Named after the planet Pluto
Uranium
U
Named after the planet Uranus. The element was discovered in 1789, shortly after the discovery of the planet.
Elements named from Mythology
Tantalum
Ta
Named after the Greek mythological king, Tantalus. It was discovered in 1802 and great difficulties were encountered in dissolving its oxide in acid to form salts. It proved to be a tantalizing problem!
Niobium
Nb
Named after Princess Niobe, the daughter of King Tantalus. According to legend, father and daughter were always found together and were very much alike. The two elements Niobium and Tantalum are usually found together in nature and their properties are very similar. Niobium was discovered in North America in 1801 and was originally named Columbium. It was renamed in 1844 after the connections with tantalum was realized. Find the positions of both elements in the periodic table
Thorium
Th
Named after Thor, the Scandinavian God of War and Thunder. It was discovered and named in 1828. Coincidentally, thorium is used today as a nuclear fuel in nuclear weapons and reactors.
Titanium
Ti
Named after Titans, the Greek supermen. Titanium is an extremely strong metal which resists attack by acids.
Vanadium
V
Named after Vandis, the Scandinavian Goddess of Beauty. The salts of vanadium have beautiful colors.
3. Elements named after Famous Scientists
Curium
Cm
Made in 1944 at Chicago. It was named in honor of Marie and Pierre Curie.
Einsteinium
Es
Made in 1952 at the University of California. It was named in honor of Albert Einstein.
Lawrencium
Lw
All of the man-made elements have been made as a result of the Nuclear Age. The majority of these elements were made at the University of California USA, in a machine called the Cyclotron. The Cyclotron was invented by Professor Ernest Lawrence. Lawrencium was made at the University of California in 1961 and named in his honor.
Mendelevium
Md
Made in 1955 at the University of California. It was named after a world famous Russian Chemist Dimitri Mendeleev.
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8. The chemical symbol for lead is Pb, which comes from the Latin word plumbum, meaning "waterworks," referring back to ancient times when the metal was widely used in the construction of water pipes.
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10. Summarize the effect of hydrogen bonding on boiling point.
11. Hydrogen fluoride (HF) has a lower boiling point than water, even though fluoride (F) has a greater electronegativity than oxygen (O). Why do you think that is?
Answer:
10. it increases the boiling point because it is a stone bond and will require much energy to break it.
11.So, to boil liquid water, all hydrogen bonds have to be broken and it requires a large amount of energy. This isn't the case in HF; all hydrogen bonds need not to be broken, and therefore a lesser amount of energy is required. So HF boils at a much lower temperature as compared to water even though F has high electronegativity but the force of attraction or the intermolecular is is weak
A sample of water has a mass of 100.0 g. calculate the amount of heat required to change the sample from ice at -45.0°c to liquid water at 75.0°c. use the chart to complete the multiple steps required to arive at the final answer. type in your answers below using 3 digits. q1 = kj q2 = kj q3 = kj qtot = kj
The amount of sensible and latent heat of mass of 0.1 kg of water will be q₁ = 9.486 kJ, q₂ = 226 kJ, q₃ = 31.5 kJ, and [tex]\rm q _{total } = 226.986[/tex] kJ.
What is thermodynamics?It is a branch of science that deals with heat and work transfer.
A sample of water has a mass of 100 g.
The amount of heat required to change the sample from ice at -45.0°C to liquid water at 75.0°C.
We know that the state of water from -45.0°C to 0°C is solid that requires sensible heat (q₁), 0°C solid to 0°C liquid is a transition that requires latent heat (q₂), and 0°C to 75.0°C is liquid that requires sensible heat (q₃).
m = 0.1 kg
The specific heat capacity of ice is 2.108 kJ/kg-K.
The specific heat capacity of water is 4.18 kJ/kg-K.
The latent heat of water at 0°C is 2260 kJ/kg.
The sensible heat is required for ice from -45.0°C to 0°C will be
q₁ = m × c × (T₂ - T₁)
q₁ = 0.1 × 2.108 × [0 - (-45)]
q₁ = 9.486 kJ
The latent heat is required for ice to water at 0°C will be
q₂ = m × LH
q₂ = 0.1 × 2260
q₂ = 226 kJ
The sensible heat is required for water from 0°C to 75.0°C will be
q₃ = m × c × (T₂ - T₁)
q₃ = 0.1 × 4.18 × (75 - 0)
q₃ = 31.35 kJ
The total energy will be
[tex]\rm q _{total } = q_1 + q_2 +q_3\\\\q _{total } = 9.486 + 226 + 31.5\\\\q _{total } = 226.986[/tex]
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Answer:
q1 = ⇒ 9.42 kJ
q2 = ⇒ 226 kJ
q3 = ⇒ 31.4 kJ
qtot = ⇒ 267 kJ
Explanation:
If ammonia is manufactured at 356 K, is the reaction spontaneous, given that the enthalpy and entropy change for the reaction are -93 kJ/mol and -198 J/mol K, respectively?
A. Yes, the ∆G is -22.5 kJ/mol.
B. No, the ∆G is 22.5 kJ/mol.
C. No, the ∆G is 92kJ/mol.
D. Yes, the ∆G is -92kJ/mol.
A. Yes, the ∆G is -22.5 kJ/mol.
Further explanationGibbs free energy is the maximum possible work given by chemical reactions at constant pressure and temperature. Gibbs free energy can be used to determine the spontaneity of a reaction
If the Gibbs free energy value is <0 (negative) then the chemical reaction occurs spontaneously. If the change in free energy is zero, then the chemical reaction is at equilibrium, if it is> 0, the process is not spontaneous
Free energy of reaction (G) is the sum of its enthalpy (H) plus the product of the temperature and the entropy (S) of the system
Can be formulated: (at any temperature)
[tex]\large {\boxed {\bold {\Delta G = \Delta H-T. \Delta S}}}[/tex]
or at (25 Celsius / 298 K, 1 atm = standard)
[tex]\tt \Delta G=-93-(356\times -0.198)\\\\\Delta G=-22.512~kJ/mol[/tex]
ΔG<0 ⇒ reaction spontaneous
SCIENCE ANSWER THIS IF YOUR IN 5TH GRADE K12
Answer: moon earth
Explanation: because the earth is rocky and has mountains so does the moon. Hope this helps!
Answer:
The Earth should be the answer.
What is the mass of an object if its density is 12.3 g/ml and it has a volume of 25 ml?
[tex]density \: = \frac{mass}{volume} [/tex]
mass = 12.3 × 25
= 307.5
approximately = 308 g
What is the pH of a solution with a concentration of 0.01M hydrochloric acid?
Now
[tex]\\ \sf\longrightarrow pH=-log[H^+][/tex]
[tex]\\ \sf\longrightarrow pH=-log10^{-2}[/tex]
[tex]\\ \sf\longrightarrow pH=2[/tex]
Convert 5.70 Kilograms to milligrams. Show your work!
Answer:
5.7e+6
Explanation:
Multiply the value in kilograms by the conversion factor '1000000'.
So, 5.7 kilograms = 5.7 × 1000000 = 5700000 milligrams.
To convert kilograms to milligrams, we need to remember that there are 1,000 grams in a kilogram and 1,000 milligrams in a gram. From this, 5.70 kilograms is equal to 5,700,000 milligrams.
1 kilogram (kg) is equivalent to 1,000 grams (g). This is a conversion factor that allows us to convert from kilograms to grams.
Additionally, 1 gram (g) is equivalent to 1,000 milligrams (mg). This is another conversion factor that allows us to convert from grams to milligrams.
To convert 5.70 kilograms to milligrams, we can use these two conversion factors:
5.70 kilograms × (1,000 grams / 1 kilogram) × (1,000 milligrams / 1 gram)
First, we multiply 5.70 kilograms by the conversion factor of 1,000 grams / 1 kilogram. This eliminates the kilograms unit and leaves us with grams:
5.70 kilograms × 1,000 grams / 1 kilogram = 5,700 grams
Next, we multiply 5,700 grams by the conversion factor of 1,000 milligrams / 1 gram. This eliminates the grams unit and leaves us with milligrams:
5,700 grams × 1,000 milligrams / 1 gram = 5,700,000 milligrams
Therefore, 5.70 kilograms is equal to 5,700,000 milligrams.
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