the swallowtail caterpillar is an example of a ?
Answer:
B) Consumer COnsumer COnsumer
Answer:
Consumer
Explanation:
It is a consumer
Does anyone have Chem2 Test please, I really need it!
Answer:
whick level are u on
I am not faking an answer but I cann arrange it to u if possible
PLEASE help
which of the following ions is in a higher oxidation state than their normal ion?
a. none of these
b. F-
c. Mg2+
d. H2+
Answer:
b
Explanation:
because it has gained an electron
[tex]F^-[/tex] ion is in a higher oxidation state than its normal ion. Hence, option B is correct.
What is the oxidation state?An oxidation state is a number given to the atom of an element when participating in a chemical reaction.
The atoms of elements are not always neutral i.e. carry no charge. They sometimes carry either positive or negative charges to become ions.
[tex]F^-[/tex] is in a higher oxidation state than its normal ion because it has gained an electron.
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Warning signs of this extreme event include gas eruptions, tremors, change in size or shift, and change in magnetic field
Answer:
convection within Earth’s interior
Explanation:
Complete question
Name this event
Solution
During the convection within Earth’s interior , the earth's core undergo convection leading to turbulent dynamic that further leads to changing of magnetic field.
Due to movement of core material, there is interaction between the mantle convection and plate motions.
Why do we not see a solar and lunar eclipse every lunar cycle?
Answer:
Explanation: We don't see lunar eclipses every cycle because the Moon's orbit is tilted five degrees from Earth's orbit around the Sun. And when an eclipse occurs the earth passes directly between Sun and Moon.
A pupil adds 5 cm of 12 mol.dm sulphuric acids to make a 250 cmº solution. Calculate the
concentration of the diluted acid.
Answer:
0.500 mol/dm³
Explanation:
Using the formula below;
CaVa = CbVb
Where;
Ca = concentration of acid (mol/dm³)
Cb = concentration of base (mol/dm³)
Va = volume of acid (cm³)
Vb = volume of base (cm³)
In accordance to the information provided in this question is;
Va = 5cm³
Vb = 250 cm³
Ca = 12 mol/dm³
Cb = ?
Using CaVa = CbVb
12 × 5 = Cb × 250
60 = 120Cb
Cb = 60/120
Cb = 0.500 mol/dm³
Why might having mud in an ecosystem be important?
Mud can replace producers in an ecosystem.
Pigs love to wallow in mud.
Mud can replace consumers in an ecosystem.
An insect needs mud wallows to breed; that insect pollinates several flowers in that ecosystem.
plsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss answer with one of the options
An insect needs mud wallows to breed; that insect pollinates several flowers in that ecosystem.
Having mud in an ecosystem is important because Insects are very important as primary or secondary decomposers in the ecosystem. These insects need mud wallows to breed. That insect pollinates several flowers in that ecosystem.
Why do insects like mud?Muddy sediments recycle organic matter back into nutrients for plant photosynthesis. Butterflies and other insects search for moisture, salt, and other nutrients. It's not just damp patches of soil that draw butterflies. Some are attracted by wet sand and dung.An insect needs mud wallows to breed.How do insects play an important role in the ecosystem?Insects like Bees are some of the most important pollinators in the ecosystem.Without bees, most of the plants we rely on would not be able to produce most of the food we eat.Therefore, the mud in an ecosystem is most important as it provides a place for insects to breed and these insects play a major role in the ecosystem like pollination.
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What will happen if the cloud does not have enough mass?
A core will form.
A star will not form.
A protostar will form.
A nebula will not form.
Which type of substance ionizes partially and gives off hydrogen ions when dissolved in
water? (5 points)
Weak base
weak acid
Strong acid
Strong base
Answer:
strong acid
Explanation:
Why do you think there was a rush to mass-produce penicillin around the time of World War II?
Answer:
penicillin could protect mice against infection from deadly Streptococci.
Explanation:
Answer:
In 1940, Florey carried out vital experiments, showing that penicillin could protect mice against infection from deadly Streptococci.
Which of these factors has the greatest influence on how many koala live in an area
Answer:
G - the number of eucalyptus trees available
The factor that has the greatest influence on how many koalas live in an area is the number of Eucalyptus trees available. The correct option is G.
What are the factors that influence something?The definition of influence as a verb is "to impact or transform someone or something in a manner that is usually significant but not directly immediate." The person or thing that impacts something else also influences that something else.
As they forage, koalas destroy trees and scatter leaves, exposing them to ground insects. Large carnivores in the ecosystem use koalas as prey because they are an essential component of the food chain. Koala conservation equates to maintaining their habitats, which serve as carbon sinks.
Therefore, the correct option is G, the number of Eucalyptus trees available.
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Scientists use carbon dating to determine the age of fossils. 14C is a rare isotope of carbon that has a half life of 5730 years and decays into 14N. By measuring the amount of 14C remaining in a fossil, scientists can estimate when the organism died out to about 60,000 years. The atomic number of C is 6, and of N is 7. 14C and 14N have the same: Group of answer choices
Answer:
The correct answer is - mass number.
Explanation:
The atomic number the number of electrons or protons present in a neutral atom.
Atomic number = Number of electrons = Number of protons
Whereas, the mass number the sum of the number of protons and the number of neutrons present in an atom.
Mass number = Number of protons + Number of neutrons
For C-14 and N-14:
C-14 isotope:
Atomic number = number of proton = number of electron = 6.
Mass number = 14
Number of neutrons = 14 - 6 = 8
In N-14 isotope:
Atomic number = number of proton = number of electron = 7
Mass number = 14
Number of neutrons = 14 - 7 = 7
Thus, these two isobars have same mass number.
NEED HELP ASAP!
When heated, cyclopropane is converted to propene. Rate constants for this reaction at 470. °C and 510. °C are k1 = 1.10 × 10-4 s-1 and k2 = 1.02 × 10-3 s-1, respectively. Determine the activation energy, Ea, from these data.
Answer:
1.06 × 10^5 J
Explanation:
We have to use the formula;
log(k2/k1) = Ea/2.303 ×R (1/T1 - 1/T2)
Given that;
k1 = 1.10 × 10-4 s-1
k2= 1.02 × 10-3 s-1
Ea=?
R=8.314 Jmol-1K-1
T1= 470. °C
T2= 510. °C
Hence;
log(1.02 × 10-3 s-1/1.10 × 10-4 =Ea/2.303 ×8.314(1/470 -1/510)
0.9672 = Ea/19.122(2.13 - 1.96) × 10^-3
0.9672= Ea/19.122(0.17) × 10^-3
0.9672= 1.7 ×10^-4 Ea/19.122
19.122 × 0.9672 = 1.74 × 10^-4Ea
Ea= 19.122 × 0.9672/1.74 × 10^-4
Ea= 18.495/1.74 × 10^-4
Ea= 1.06 × 10^5 J
AYUDENME A CONTESTAR ESTO
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umm how do you begin answering that ??
Give the number of protons and neutrons in the nucleus of an atom of each of the following isotopes, and the number of electrons in a neutral atom of that isotope:
a. copper-65
b. helium-4
c. cobalt-60
d. nitrogen-15
Answer:
The development of modern atomic theory revealed much about the inner structure of atoms. It was learned that an atom contains a very small nucleus composed of positively charged protons and uncharged neutrons, surrounded by a much larger volume of space containing negatively charged electrons. The nucleus contains the majority of an atom’s mass because protons and neutrons are much heavier than electrons, whereas electrons occupy almost all of an atom’s volume. The diameter of an atom is on the order of 10−10 m, whereas the diameter of the nucleus is roughly 10−15 m—about 100,000 times smaller. For a perspective about their relative sizes, consider this: If the nucleus were the size of a blueberry, the atom would be about the size of a football stadium (Figure 1).
Figure 1. If an atom could be expanded to the size of a football stadium, the nucleus would be the size of a single blueberry. (credit middle: modification of work by “babyknight”/Wikimedia Commons; credit right: modification of work by Paxson Woelber)
Atoms—and the protons, neutrons, and electrons that compose them—are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g, and an electron has a charge of less than 2 × 10−19 C (coulomb). When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu) and the fundamental unit of charge (e). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are assigned masses of exactly 12 amu. (This isotope is known as “carbon-12” as will be discussed later in this module.) Thus, one amu is exactly 112112 of the mass of one carbon-12 atom: 1 amu = 1.6605 × 10−24 g. (The Dalton (Da) and the unified atomic mass unit (u) are alternative units that are equivalent to the amu.) The fundamental unit of charge (also called the elementary charge) equals the magnitude of the charge of an electron (e) with e = 1.602 × 10−19 C.
A proton has a mass of 1.0073 amu and a charge of 1+. A neutron is a slightly heavier particle with a mass 1.0087 amu and a charge of zero; as its name suggests, it is neutral. The electron has a charge of 1− and is a much lighter particle with a mass of about 0.00055 amu (it would take about 1800 electrons to equal the mass of one proton. The properties of these fundamental particles are summarized in Table 3. (An observant student might notice that the sum of an atom’s subatomic particles does not equal the atom’s actual mass: The total mass of six protons, six neutrons, and six electrons is 12.0993 amu, slightly larger than 12.00 amu. This “missing” mass is known as the mass defect, and you will learn about it in the chapter on nuclear chemistry.)
Describe the traits of a reliable investigation.
Answer:
Every science experiment should follow the basic principles of proper investigation so that the results presented at the end are seen as credible.
Observation and Hypothesis. ...
Prediction and Modeling. ...
Testing and Error Estimation. ...
Result Gathering and Presentation. ...
Conclusions. ...
Law Formation.
Reptiles, amphibians, and fish are all cold-blooded animals. Their body temperatures are determined by their surroundings. How does a cold-blooded animal’s ability to digest food change in colder temperatures?
What would a chemist most likely study about a car? 1- The amount of rotations of the wheel that occur in 1 mile. 2- The reaction of gasoline combustion in the engine. 3- The accuracy of the speedometer. 4- The strength of the car frame.
Answer:
b
Explanation:
e2020
Answer:B
Explanation:It was correct
Please help !!!Is this Lewis dot structure correct? Check whether each atom has an octet and whether the total electrons in the structure match the total valence
electrons of the elements. There MUST be a clear yes/no and some evidence of work in your answer
Answer:
The Lewis dot structure is not correct
Explanation:
Each atom ought to be surrounded by eight electrons or two electrons according to the octet rule. We now need to closely examine the structure to see if it fits into this description.
All the atoms in the molecule have the correct valence except the hydrogen which is directly attached to the oxygen.
The positive charge ought to mean that more than two bonds were formed between hydrogen and oxygen which is clearly not the case here.
Thus, the hydrogen atom attached directly to oxygen does not display the correct valence.
how many elements have been discovered so far by scientists
Answer:
118 elements have been discovered so far
Explanation:
how is the purity of substances important?
Answer:
Pure substances have the ability to form predictable outcomes from their chemical reactions. Chemists tend to use pure substances when conduction chemial research as impure substances can mess up their experiments.
Jake put a bottle of water on the desk and left the room. When he came
back, he found water drops on the outside of the bottle. Where did the
water on the outside of the bottle come from?
Answer:
The air in the room
Explanation:
The diffrent temp of the water compared to the room. The water was colder than the room.
1. Do you think the Genesis story and Big Bang Theory support one another? Why or why not?
2. Do the parallels between the Big Bang/Evolution and the Genesis Creation story strengthen your belief in the idea that God created everything? Why or why not?
3. If you don't believe in the idea of God being the creator, what is your belief for where all the matter and energy of the universe come from? Explain.
Answer:
This is my favorite topic to address. Do you think the Genesis story and Big Bang Theory support one another? Why or why not?
No, the Genesis story and the Big Bang Theory support one another. I'll explain why, God has the power to do the marvelous, the everything that seems impossible to human eyes. Scientist say there was an explosion that originated the universe. That is possible. However, it must have been a controlled explosion.
"Awake 1996 The Awesome Universe What the Big Bang Explains—What It Doesn’t":
What the Big Bang “Explains”: The most popular version of creation says that about 15 to 20 billion years ago, the universe didn't exist. There was no time, no matter—nothing except an infinitely small point called a singularity, which exploded into the present universe. During the first few minutes of the big bang, nuclear fusion took place on a universal scale. After that it gave rise to the currently "measured concentrations of hydrogen and helium" and part of the lithium in "interstellar space". After around "300,000 years, the universe wide fireball dropped to a little below the temperature of the surface of the sun, allowing electrons to settle into orbits around atoms and releasing a flash of photons, or light."
Questions the Big Bang Does Not Answer: "As the report goes on to note, “other data indicate that certain stars are at least 14 billion years old".
"Still another problem for the big bang has come from evidence of “bubbles” in the universe that are 100 million light-years in size, with galaxies on the outside and voids inside. Margaret Geller, John Huchra, and others at the Harvard-Smithsonian Center for Astrophysics have found what they call a great wall of galaxies some 500 million light-years in length across the northern sky. Another group of astronomers, who became known as the Seven Samurai, have found evidence of a different cosmic conglomeration, which they call the Great Attractor, located near the southern constellations of Hydra and Centaurus. Astronomers Marc Postman and Tod Lauer believe something even bigger must lie beyond the constellation Orion, causing hundreds of galaxies, including ours, to stream in that direction like rafts on a sort of “river in space.” Also, "Cosmologists say the blast from the big bang was extremely smooth and uniform, according to the background radiation it allegedly left behind. How could such a smooth start have led to such massive and complex structures? “The latest crop of walls and attractors intensifies the mystery of how so much structure could have formed within the 15-billion-year age of the universe,” admits Scientific American—a problem that only gets worse as Freedman and others roll back the estimated age of the cosmos still more."
Do the parallels between the Big Bang/Evolution and the Genesis Creation story strengthen your belief in the idea that God created everything? Why or why not?
Romans 1:20 states: "For his invisible qualities are clearly seen from the world’s creation onward, because they are perceived by the things made, even his eternal power and Godship, so that they are inexcusable." The book "Draw close to Jehovah" further states: "Just think of the blinding flashes and rumbling booms of a thunderstorm, the glorious cascade of a mighty waterfall, the overwhelming vastness of a starry sky! Do you not see the power of God in such displays? Yet, few in today’s world truly recognize God’s power. Still fewer view it properly. Understanding this divine attribute, though, gives us many reasons for drawing closer to Jehovah."
Based on the book: "Draw Close to Jehovah" it say's: "We do not need to witness a miracle to discern that God possesses this attribute (power). It is readily apparent. The Bible tells us that creation gives proof of Jehovah’s “eternal power and Godship.” Based on the magazine: "Awake 1996 The Awesome Universe What the Big Bang Explains—What It Doesn’t" states that "EVERY morning is a miracle." And its true! Deep inside the morning sun, hydrogen is being fused into helium at high temperatures that are at million degrees. X rays and gamma rays pour out "of the core into the surrounding layers of the sun." If the sun was transparent, "the rays would blast their way to the surface in a few seconds. Instead, they begin to bounce from tightly packed atom to atom of solar “insulation,” gradually losing energy." Days, weeks, centuries, pass. Thousands of years later, that once deadly radiation finally emerges from the sun’s surface as a gentle shower of yellow light—no longer a menace but just right for bathing earth with its warmth.
model the process: nuclear fusion of deuterium and tritium into helium.
Is the following chemical equation and exothermic or endothermic
reaction..... Mg + 2H20 - Mg(OH)2 + H2+ heat
Answer:
Exothermic
Explanation:
Exothermic reactions RELEASE heat as a product.
If you were to see "heat" or "energy" above the reaction arrow, then it would be endothermic.
What is the empirical formula of a compound that has 40% carbon, 6.7% hydrogen,
and 53.3% oxygen?
Which compound?
Answer:
Formaldehyde(CH[tex]_{2}[/tex]O) or methanal is your answer.
Determine the density of 1 L of carbon tetrahydride gas at 19 C and 870 mmHg.
Answer:To calculate the molar mass, first calculate the number of moles of gas using the ideal gas equation. 1 atm. 750 mmHg. (1.00 L). 760 mmHg. 0.0306 mol. L atm.
Explanation:
Where are the electrons found in Bohr's atomic model? O A. The electrons orbit the protons at the atom's center. B. The electrons circle the nucleus in specific orbits. C. The electrons are evenly distributed throughout the atom. O D. The electrons occupy the atom's center, with protons orbiting.
Answer:
O A. The electrons orbit the protons at the atom's center
Explanation:
It was proved by Bohr that electrons are revolving in orbits which creates magnetic fields around the atom.
What mass of water can be heated from 45°C to 70°C by the addition of 875 Joules?
Please I need this
Answer:
17000 joules.
Explanation:
Explanation:
With knowledge of the specific heat capacity of a substance, its mass, and the temperature change, we can convert this to the energy required for this temperature change using:
ΔH=mCΔT, where
ΔH=change in enthalpy (J)
m= mass of substance being heated (g) i.e. water in this question
C= specific heat capacity (J/g°C)
ΔT= change in temperature (°C)
We know mass=65g and ΔT=76°C−12°C=64°C
The specific heat capacity of water is 4.18J/g°C
Therefore, ΔH=65g⋅4.18Jg°C⋅64°C
=17388.8J
=17000J (2 significant figures)
In a titration of hydrobromic acid (HBr) against sodium hydroxide (NaOH), 22.20 mL of 0.150 M NaOH is required to neutralize 36.60 mL of HBr. Calculate the molarity of the HBr. M1V1=M2V2
Answer:
[HBr] = 0.0910 M
Explanation:
NaOH → Strong base
HBr → Strong acid.
This is a titration that involves a strong acid and a strong base, so the recaction is about acid base equilibrium.
Formula for titration in the equivalence point is:
mmoles of acid = mmoles of base
M . Volume of acid = M . volume of base
We replace data:
M . 36.60 mL = 0.150 M . 22.20 mL
M = (0.150 M . 22.20 mL) / 36.60 mL
M = 0.0910 mol/L