Why is copper a pure substance? a. because it is an element b. because it is a compund c. because it is a homogenous mixture
Answer:
a. because it is an element
Explanation:
its pure because it only has one type of atom, making it an element
Which one of the following molecules can form hydrogen bonding?
Answer:
it is a
Explanation:
i hope this helps you
Identify the combustion reaction
Answer:
C₄H₁₂ + 7O₂ --> 4CO₂ + 6H₂O
Explanation:
Organic molecules react with O2 to create water and CO2 in combustion processes. C4H12 is an organic molecule that combines with O2 to create water and CO2 as shown in the reactions.
As a result, this is the sole reaction that obeys the general combustion equation.
You and your classmates are working to develop a prototype for a new type of drone. The drone needs to fly and will be controlled by a remote control. Which STEM fields would be most important for you to have knowledge of to build this drone?
A) chemistry and botany
B) astronomy and geology
C) medicine and geology
D) physics and computer science
Which sentence best describes Earth's rotation?
Earth rotates on its axis once every two days.
Earth rotates on its axis once every year.
Earth rotates on its axis once every 24 hours.
Earth rotates on its axis twice every 24 hours.
Answer:
C.
Explanation:
no explanation but hope this helps
Answer:
A
Explanation: IF U PRESS A U GO TO COLLAGE
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PLEASE HELP DUE IN 10 MINUTES In your own words, how does photosynthesis work?
Answer:
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil
What is the compound N₂O called?
Answer:
I believe its preferred to as "Laughing Gas." It's also called, Nitrous Oxide.
differentiate between lignite and anthracite
Answer:
Anthracite is the coal of highest grade whereas Lignite is the lowest grade coal
____ are designed to make necessary adjustments to place a satellite into stable orbit.
there an A B C D thing?
Explanation:
890
Answer: thrusters
Explanation: got it right
On Eagle Mountain (the highest point in Minnesota), you weigh ____ when you travel the 15 miles to get to Lake Superior's shore.
Question 2 options:
less than
the same as
more than
all of the above
If you are up on Eagle Mountain you weigh more than when you travel the 15 miles to get to Lake Superior's shore.
What is weight?The weight of an object is the product of the mass and the acceleration due to gravity. The acceleration due to gravity of an object is the impact owing to the fact that the object lies within the earth's gravitational field.
If you are up on Eagle Mountain you weigh more than when you travel the 15 miles to get to Lake Superior's shore.
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How does an unconformity affect our geological knowledge of an area?
Answer:
Because the Earth is always shifting, so research has to constantly be updated.
Name these compounds according to IUPAC.
Functional groups are alcohol, carboxylic acids, ester, ketone, etc. The compounds are 2,2 dimethyl propane, 2-methyl butane, and ethanol.
What are functional groups?Functional groups provide specific chemical properties that are linked to the main chain of the compound and define the role of the compound. The first compound has two methyl (CH₃) groups at the second carbon and a total of three carbons making the compound, 2,2 dimethyl propane.
In the second compound, there is a methyl group on the second carbon and total of four carbons making it 2-methyl butane, and the third compound is two carbon with alcohol as the functional group making it ethanol.
Therefore, the compounds are 2,2 dimethyl propane, 2-methyl butane, and ethanol.
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Water has a specific heat of 4.184 J/goC. Copper metal has a specific heat of 0.385 J/goC. What can be said about the amount of heat needed to raise both substances 1 degree Celsius. (In other words, which one will take more heat to raise 1 degree.)
It can be said that water will take more heat to raise its temperature by 1°C than copper. Details about specific heat can be found below.
What is specific heat capacity?Specific heat capacity of a substance can be defined as the amount of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K or 1 °C.
According to this question, water has a specific heat of 4.184 J/g°C while Copper metal has a specific heat of 0.385 J/g°C. This shows that water has a higher specific heat.
Therefore, it can be said that water will take more heat to raise its temperature by 1°C than copper metal.
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is there enough oxygen for complete combustion?
Answer:
Complete combustion occurs when there is enough oxygen to completely use up all the reactants. Incomplete combustion occurs when there is not enough oxygen resulting in the production of smoke, and less energy is produced when compared with complete combustion.
What is the poh in a solution if the [oh-] = 5.42 x 10-5 m?
a
5.26
b
7.26
c
4.26
d
6.26
Answer:
b
Explanation:
is the dictionary definition of a word.
is the feeling or idea associated with a word.
- What mass of sulfur trioxide is formed and what is the limiting reactant? Please show all of your calculations so I can understand, please and thank you?
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What most likely happens when a liquid gains heat?
O it changes into gas
it changes into a solid
Onts temperature decreases
O its temperature remains constant
-Jewel Warren
it turns into a gas due to vaporization
Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.
Critical mass can be achieved by compressing the sample of americium-241 and also removing the deflective shield surrounding the sample.
What is critical mass?Critical mass of a nuclear reaction is the mass of nuclear fuel which is just sufficient for a nuclear fission reaction to proceed and be sustained.
In order to achieve critical mass, the density of the fuel is increased by compressing the sample of americium-241 and also remove the deflective shield surrounding the sample.
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Answer: A
Explanation:
a.
Convert these temperatures to Kelvin:
A. -22 °C
b. 206 °C
C. 50 °C
d. 8 °C
Fill in the blanks to create the lesson question, which is the broad question about gases that Boyle’s law answers. You will explore this question in the lab experiment.
Lesson Question: What is the effect of on the volume of a gas?
A. pressure
B. the number of moles
C. temperature
D. molecular structure
E. The mass of the Gas
Hypothesis: If the pressure on a gas is increased, then its volume will ..
A. Decrease
B. increase
C. Stay the same
D. fluctuate randomly
because the gas molecules will ...
A. scatter at random
B. Break apart
C. change into solid form
D. be pushed closer together
E. be pushed farther apart
Answer:
The kinetic energy would decrease with increaseThe densities of copper, silver, iron, and magnesium are in that order. You are given grams of each metal. Which one has the largest volume
Density is the ratio of mass to volume. The substance with the lowest density has the largest volume. The volume of magnesium will be the largest.
What is density?Density is the mass per volume of the substance. It is denoted by the Latin letter rho (ρ) or D. It is the division of the mass in kilograms to the volume in cubic meters.
The relation of the density is inversely proportional to the volume and when the order is given in increasing order of density then magnesium will have the largest volume as it has the least density.
Therefore, magnesium has the largest volume.
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which term best defines the feeding behavior of most gulls?
Answer:
Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century, most gulls were placed in the genus
How can these objects all weigh the same but be different sizes?
How many kilojoules of heat are produced when 34.0 g of Fe2O3 reacts with an excess of CO according to the following reaction? Fe2O3 + 3 CO 2 Fe + 3 CO2 ΔH = -26.3 kJ
The heat produced when iron oxide reacts with carbon monoxide is -23.47 kJ/mol.
What is the enthalpy of reaction?
The standard enthalpy of the reaction is given by the enthalpy of formation of the products and the reactants. The reactants and the products of the reaction are:
Fe₂O₃ (s) + 3CO (g) → 2Fe(s) + 3CO₂ (g)
We know,
The standard enthalpy of formation of iron oxide = −825.50 kJ/mol
The standard enthalpy of formation of carbon monoxide = −110.53 kJ/mol
The standard enthalpy of formation of carbon dioxide = −393.52 kJ/mol
The standard enthalpy of reaction is calculated as:
[tex]\rm \Delta H_{rxn}[/tex] = [2(0) + 3(−393.52)] - [1(-825.50) + 3(-110.53)]
= (0−1180.56+825.50+331.59)
= −23.47 kJ/mol
Therefore, −23.47 kJ/mol is produced.
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Which chemical equation is unbalanced? c o2 right arrow. co2 sr o2 right arrow. 2sro 6h2 3o2 right arrow. 6h2o h2 h2 o2 right arrow. h2o h2o
The unbalanced equation is one in which the moles of atoms are not equal on both sides of the reaction.
What is a balanced chemical equation?A balanced chemical equation is one in wgich the moles of atoms in the reactants side is equal to the moles of atoms on the product side.
The given equations of reaction is not clearly stated.
Therefore, the unbalanced equation is one in which the moles of atoms are not equal on both sides of the reaction.
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Draw a complete enthalpy diagram for the following reaction: 4Na(s) + O2(g) → 2Na2O(s). H=-178kJ
The enthalpy change of the given reaction is negative, so the reaction is an exothermic reaction.
What is enthalpy change of a reaction?Enthalpy change of a reaction is the energy changes that occur when reactant molecules form products.
Enthalpy is the heat content of a substance.
When enthalpy change is positive, the heat content of the product is greater than that of the reactant and the reaction is an endothermic reaction.
Whereas, when enthalpy change is negative, the heat content of the reactant is greater than that of the product and the reaction is an exothermic reaction.
Therefore, since the enthalpy change of the given reaction is negative, the reaction is an exothermic reaction.
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If the concentration of H+ is 4.29 x 10-4 M, what is the pH?
pH = - log [H⁺]
pH = - log 4.29 x 10⁻⁴
pH = 4 - log 4.29
why is the ring around saturn
Answer:
Saturn's rings are made up of ice, dust, rocks, moons and other satellite that orbit the gas giant as its equator, where gravity is strongest.
Explanation:
A telescope would be MOST useful in answering which question? . O How do rockets move in space? What shape is a human skin cell? O What is on the surface of the Moon? O How do worms breathe underground?
Answer:
what is on the surface of the moon.
Explanation:
Which has the most thermal energy?
1 points
200 ml of cold water
200 ml of hot water
100 ml of hot water
100 ml of cold water