Answer:
Add 2 to Cu in first part of problem only
What is the greatest
source of light in the
ocean?
Answer:
the greatest source of light in the ocean is the sun.
1 point
5. A drug or other chemical compound whose manufacture, distribution,
possession, and use is regulated by the legal system is referred to as a
poison.
a.poison
b. narcotic
c. toxin
d. controlled substance
I'm pretty sure its D because if it's manufactured and distributed its likely not toxin or poison. a narcotic could be a controlled substance so that's why I'm leaning towards D
How and why do we see colors?
Answer:
Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. Newton observed that color is not inherent in objects. Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors.
45) Rank Ca, Se, Co from the lowest to highest ionization energy.
46) Rank Te, S, and O from the lowest to the highest electronegativity.
Answer:
45) Ca < Co < Se
46) Te < S < O
Explanation:
These questions are talking about periodic trends. Here are some things to know about periodic trends:
Electronegativity
how well an element attracts an electronincreases left to right and bottom to top on the periodic tablenoble gases are not includedfluorine is most electronegative element, Francium is leastAtomic Radius
the distance between nucleiincreases from right to left and top to bottom on the periodic table the more electronegative an element is, the smaller it's atomic radiusFrancium has the largest atomic radius while fluorine has the smallestIonization Energy
the energy required to remove an electrondirectly proportional to electronegativityMetallic Character
how closely an element's properties match those of a metaldirectly proportional with atomic radiusHope this helps :)
Plz help :’(
Using structural formula, write a balanced equation for the following and name the organic product.
2-methylbutan-1-ol + hot conc H2SO4
Explanation:
2-metylbutene should be the profuct
What is the difference between a renewable and non-renewable source of energy? Give 3 examples of each.
Answer:
There are two major categories of energy: renewable and non-renewable.
Non-renewable energy resources are available in limited supplies, usually because they take a long time to replenish. The advantage of these non-renewable resources is that power plants that use them are able to produce more power on demand. The non-renewable energy resources are:
CoalNuclearOilNatural gasRenewable resources, on the other hand, replenish themselves. The five major renewable energy resources are:
SolarWindWater, also called hydroBiomass, or organic material from plants and animalsGeothermal, which is naturally occurring heat from the earthWhile renewable energy resources have the advantage of unlimited supply over the long haul, they are limited in their availability at any given moment.
For example, the sun rises each day, but its ability to generate power is limited when its cloudy. Another disadvantage is that power plant operators can’t crank up renewable energy production when people are consuming more power, such as on a hot day when many people are running air conditioners at the same time.
In this case you have unlimited iron, but only 6.40 moles of oxygen (O2). How much Fe2O3 can you produce?
Answer: 682 grams
Explanation:
The balanced chemical reaction is:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
[tex]O_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Fe[/tex] is the excess reagent.
According to stoichiometry :
3 moles of [tex]O_2[/tex] produce = 2 moles of [tex]Fe_2O_3[/tex]
Thus 6.40 moles of [tex]O_2[/tex] will produce=[tex]\frac{2}{3}\times 6.40=4.27moles[/tex] of [tex]Fe_2O_3[/tex]
Mass of [tex]Fe_2O_3=moles\times {\text {Molar mass}}=4.27moles\times 159.69g/mol=682g[/tex]
Thus 682 g of [tex]Fe_2O_3[/tex] will be produced from 6.40 moles of oxygen
Can someone help me out with the question
Radioactive decay follows first-order kinetics. If a sample of I-131 decays from 25.0 mg to 8.25 mg in 12.8 days, what is the rate constant, k?
Answer:
k = 0.0866 days⁻¹
Explanation:
The isotope decay of the atom follows the equation:
ln [A] = -kt + Ln[A]₀
Where [A] is the amount of the isotope after time t = 8.25mg
Time = 12.8days
k is rate constant
[A]₀ is actual amount of the isotope = 25.0mg
Replacing:
ln 8.25mg = -k*12.8days + ln 25.0mg
2.11 - 3.22 = -k*12.8days
-1.11 = -k12.8days
k = 0.0866 days⁻¹
• In trial 2 of the vinegar-baking soda reaction, how did the masses of reactants and products compare?
Answer:
Yes (In a closed (or sealed) system, the total mass of reactants and products will remain the same.)
Explanation:
Answer:
they are the same
Explanation:
^_^
Hypothesis: What do you think will happen when you add more magnets to the set up?
Answer:
........................
a. How many moles of hydrogen would be needed to produce 12 moles of ammonia
8 moles and I hope that this helps
How does a liquid change as it moved from one container to another?
Answer:
gas
Explanation:
Elements are solid liquid and gas substance that can be found on earth which statements best describes an element
Answer:
i guess
Explanation:
we will never know
what is the difference between evaporation and boiling
Answer/Explanation:
Let's define both terms
Boiling: is defined as a process whereby the liquid state is turned into gaseous state at a specific boiling point. And it is a fast process.
Evaporation: is defined as a process whereby a natural process in which the increase in temperature or pressure causes liquid to change into gas.
Difference between boiling and evaporation
In boiling, temperature of the liquid remains constant. While in evaporation, temperature of the liquid reduces
In boiling, temperature is required only at boiling point while in evaporation, temperature occurs at any given temperature.
In boiling, bubbles are formed while in evaporation, bubbles are not formed.
In boiling, a source of energy is required while in evaporation, the surrounding supplies the energy required.
Boiling produces heat and does not lead to liquid cooling, evaporation leads to liquid cooling.
The molecules of the liquid move faster in boiling than in evaporation
How are the atmospheres on Jupiter and Saturn different than those on Uranus and Neptune?
Answer:
The atmospheres of Jupiter and Saturn are made almost entirely of hydrogen and helium, although there is some evidence they contain hydrogen compounds. The there is Uranus and Neptune that are made primarily of hydrogen compounds, with smaller traces of hydrogen, helium, metal and rock.
Explanation:
Hope this helps.
Which of the following atoms has the largest radius?
Mg
Si
S
Cl
Answer:
Mg
Hope this helps :D sorry if im wrong :(
How many liters of P, are in 3.5x1022 molecules at STP?
Answer: they giving you some hard question
Explanation:
i dont know know what the answer is do you have any answer options
onsider a tank used in certain hydrodynamic experiments. After one experiment the tank contains 200 L of a dye solution with a concentration of 1 g/L. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in at a rate of 2 L/min, the well-stirred solution flowing out at the same rate. Find the time that will elapse before the concentration of dye in the tank reaches 1% of its original value.
Answer:
Explanation:
From the given information;
Let Q(t) = mass of dye in the tank as a function of time
The mass in the tank = 200 L × (1g/L) = 200 g
Using the law of mass conservation;
[tex]\dfrac{dQ}{dt} = \text{(Rate of incoming mass)- (rate of outgoing mass)}[/tex]
[tex]\dfrac{dQ}{dt} = (2 L/min ) (0 \ g/L) - (2 L/min ) (\dfrac{Q}{200}g/L)[/tex]
[tex]Q' = \dfrac{-Q}{1000}[/tex]
Q(0) = 200
By finding the solution to the ODE using the method of separation of variables;
[tex]\dfrac{Q'}{Q} = -0.01[/tex]
[tex]Q(t) = Ce^{-0.01t}[/tex]
Using the initial condition;
200 = Q(0) = C
[tex]Q(t) = 200e^{-0.01t}[/tex]
1% of 200g = 2g of dye solution
∴
[tex]2 = 200e^{-0.01t}[/tex]
[tex]e^{-0.01t}=0.01[/tex]
[tex]t =\dfrac{ In(0.01}{-0.01}[/tex]
t = 460.5 hours
14
Use the data in the table to work out the state of each substance at 25 °C. *
(3 Points)
Substance
Melting point (°C)
Boiling point (°C)
State at 25 °C
methane
-182
-164
dodecane
-10
216
phenol
43
182
(3 marks)
Enter your answer
This question is required.
16
Answer:
Explanation:
The melting point of a substance is the temperature at which its melt. The state of a substance is dependent on it's melting temperature. Generally, melting point above 25 °C is a solid.
This means phenol is a solid
Duodecane has melting point below 25 °C hence it is either a liquid or gas. However its boiling point of 216 °C means it would require higher temperature to boil it. Since 25 °C is less than 216 °C it means that it would remain in the liquid state.
Methane has melting point below 25 °C hence it is either a liquid or gas. However its boiling point of -164 °C means it boils easily even at very low temperatures. Since 25 °C is greater than -164 °C it means that it would exist in the gaseous state
Every day a 6th grade class puts candy into bags to prepare for Valentine's Day. They put
7 pieces of candy in each bag. If they make 28 bags in 4 days, how many bags would
they make in 10 days?
How many particles are in 67 grams of Oxygen?
Answer this correctly please...
1. Two body systems Which of the following is NOT a part of the integumentary system of the body?
A. hair
B. bones
C. skin
D. finger and toe nailswork together to help remove waste products from blood.
2. What are these two systems?
A. circulatory and excretory
B. skeletal and digestive
C. circulatory and integumentary
D. muscular and excretory
3. One of the functions of the endocrine system in the body is to -
A. circulate blood to all parts of the body
B. collect waste products and remove them from the body
C. provide a strong framework for the body
D. produce enzymes to help digest food
6. When a person’s body needs food, the brain helps maintain homeostasis by sending signals that make the person
A.feel hungry.
B. perspire.
C. put on a sweater.
D. feel tired
7. The largest human body organ which regulates temperature and serves as a barrier against harmful microorganisms belongs to the -
A. circulatory system
B. nervous system
C. digestive system
D. integumentary system
8. Which of the following is NOT a part of the respiratory system?
A. diaphragm
B. esophagus
C. lungs
D. trachea
9. What would happen to your body if you had little or no bone marrow?
A. Your other systems would make up for it
B. You would not have enough red blood cells
C. Nothing would happen to you.
D. You would not have enough cartilage.
Answer:
1. B
2. C
3. B or D
6. A
7. D
8. A
9. A
Explanation:
Brainliest plz answered to the best of my abilitys
Beth wrote the following description of the life cycle of non-flowering, seed-bearing plants. Read her description and find the mistake.
"Non-flowering, seed-bearing plants go through four major stages in their life cycles. The first stage is when the plant is a seed from a cone. The second stage is when the plant sprouts out of the seed and the cones begin to grow. The third stage is the when the plant is a seedling. The fourth stage is when the plant is a bigger seedling."
What statement corrects the error in Beth's report? (10 points)
a
There are five stages in the life cycle of non-flowering, seed-bearing plants, not four.
b
Cones do not begin to grow in the second stage.
c
The third stage is when the plant sprouts out of the seed and the flower grows.
d
The fourth stage is when the plant is an adult plant growing leaves and cones which produce more seeds.
Answer:
Ok so I know the answer is not B, cones do not grow on the second stage.
Explanation:
I took the test my self and I choose that one and it was wrong. Sorry if this doesn't help I will put the correct answer one here someday
Answer:
the answer is b
Explanation:
because its the only true onE and i hope i dont fail soooooo
someone please help!! I need an answer by 10:20
“I used to think _____________ about electricity, and now I think….”
Im in 7th grade btw
100 points!!!
Answer:
"I used to think a lot about electricity, and now I think..."
or a synonym of it.
Explanation:
How many protons does isotope of carbon- 14 atom have
Answer:
Number of protons in Carbon - 14 atom [tex]6[/tex]
Explanation:
The atomic number of carbon 14 atom is [tex]14[/tex]
Number of neutrons in the nucleus of Carbon-14 atom [tex]= 8[/tex]
Atomic number is equal to the sum of neutrons and protons
Number of protons in Carbon - 14 atom [tex]= 14 -8 = 6[/tex]
Helppppppppppppppppppppppp
Answer:
B. Periodic electrons
Specify the number of possible isomers of bromodimethylbenzene. 6 Write the name of one of these isomers. Abbreviate ortho (o), meta (m) and para (p), no italics, if you elect to use these terms.fill in the blank 2 Specify the number of possible isomers of aromatic compounds with the formula C7H8O. ___ Write the name of one of these isomers. Abbreviate ortho (o), meta (m) and para (p), no italics, if you elect to use these terms. fill in the blank 4
Answer:
Explanation:
See attached file .
The number of possible isomers of Bromodimethylbenze are 6. One of the isomers is 2 Bromo - m -xylene. The number of possible isomers of an aromatic compound [tex]\rm C_7H_8O[/tex] are 5. One of these isomers has been o - cresol.
(a). Bromodimethylbenze has also been known as bromoxylene. The compound has been consisted of 1 benzene ring with 2 methyl groups and a bromine atom.
The possible isomers of bromoxylene are:
4 Bromo - o -xylene3 Bromo - o -xylene2 Bromo - m -xylene4 Bromo - m -xylene5 Bromo - m -xylene2 Bromo - p -xylene(b). Aromatic compound with formula [tex]\rm C_7H_8O[/tex] has been the benzene compound. The compound has been consisted of a benzene ring with 1 methyl group and oxygen atom.
The possible isomers of [tex]\rm C_7H_8O[/tex] are:
Benzyl alcoholAnisolo - cresolp - cresolm - cresolThus, the number of possible isomers of Bromodimethylbenze are 6. One of the isomers is 2 Bromo - m -xylene. The number of possible isomers of an aromatic compound [tex]\rm C_7H_8O[/tex] are 5. One of these isomers has been o - cresol.
For more information about isomers, refer to the link:
https://brainly.com/question/12796779
42 mole Al= how many atoms?
2.5 × 10²³ atoms Al
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
42 mol Al
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 42 \ mol \ Al(\frac{6.022 \cdot 10^{23} \ atoms \ Al}{1 \ mol \ Al})[/tex]Multiply/Divide: [tex]\displaystyle 2.52924 \cdot 10^{25} \ atoms \ Al[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
2.52924 × 10²³ atoms Al ≈ 2.5 × 10²³ atoms Al
camouflage
2. chemical warfare
3. commensalism
4. indicator species
5. interspecific competition
a relationship in which one
organism lives in or on another organism
and benefits from that relationship while
the host organism is harmed by it
those species that normally live
and thrive in a particular community
species that play critical roles in
their communities and help determine
the types and numbers of other species
in a community
association in which one organism
is benefited and the other organism is
neither benefited nor harmed
20
species that serve as early
warnings of damage to a community or
ecosystem
competition between species for
shared or limited resources
using chemical substances to kill or
injure predator or prey
species that migrate or are
deliberately introduced into a community
where they would not normally live
a relationship between two kinds
of organisms that benefits both
blending in with one's
surroundings
an adaptation in which an animalis
protected against predators by its
6. invasive
7. keystone species
8. mimicry
9. mutualism
10. native species
11 parasitism