Which property is a chemical property of a substance?
Answer:
A chemical property is a characteristic of a particular substance that can be observed in a chemical reaction. Some major chemical properties include flammability, toxicity, heat of combustion, pH value, rate of radioactive decay, and chemical stability.
How many protons, neutrons, and electrons make up an ion of
phosphorus-28 that has a -3 charge?
11 Pt
Answer:
protons=15
electron=15
neutron=16
Mention and discuss briefly the adverse effects of chemistry.
Depending on the chemical, these longer-term health effects might include:
organ damage. weakening of the immune system. development of allergies or asthma. reproductive problems and birth defects. effects on the mental, intellectual or physical development of children. cancer.The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is –5074 kJ/mol. The reaction equation is: C8H18(l) + 12.5O2(g) arrwo 8CO2(g) + 9H2O(g).
What is the enthalpy of formation for this reaction?
16CO2(g) + 18H2O(g) arrow 2C8H18(l) + 25O2(g)
The enthalpy change for reaction (2) is 10178 kJ/mol.
What is enthalpy of reaction?
The term enthalpy of reaction has to do with the heat that is evolved or absobed in a chemical reaction.
We have the equations;
C8H18(l) + 12.5O2(g) -----> 8CO2(g) + 9H2O(g).16CO2(g) + 18H2O(g) ----->2C8H18(l) + 25O2(g)We can see that equation (2) is obtained from (1) by multiplication using a factor of 2. and also (2) is a reverse of (1). It then follows that the enthalpy change for reaction (2) is 10178 kJ/mol.
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Answer:
10,148 kJ
Explanation:
Which is the larger species in each pair?
a. Sr or Sr2+
b. N or N3-
c. Ni or Ni2+
d. S2- or Ca2+
The element which larger species in each pair are Sr ,N3-, Ni, S2-.
What is an element ?A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.
A substance made up of only one kind of atom, all of which have the same number of protons, is said to be an element. One famous illustration is pure gold. A ring constructed of pure gold would be composed of countless millions of atoms, each with the same atomic number and 79 protons in its nucleus.
The three categories of elements are metal, non-metal, and metalloid. Metals like sodium, calcium, caesium, and other elements on the extreme left of the periodic table are examples of this.
Thus, The element which larger species in each pair are Sr ,N3-, Ni, S2-.
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An engineer is investigating the ways in which electroplating is currently
done. This is an example of which step in the engineering process?
Answer:
Background research
Explanation:
Câu 1: Oxide nào sau đây là oxide lưỡng tính? 2 MgO A Fe203 B ZnO Cao D
Answer:
chưa hiểu đáp ánkia cho lắm. Nhưng đáp án là ZnO nha
Explanation:
pleas
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Answer:
B.
Explanation:
yan sagot ko tnx sa points
Which of an atom's electrons are involved in chemical reactions?
a. The electrons farthest from the nucleus of the atom
b. The electrons that make one isotope different from another
c. The electrons that determine the atomic number of the atom
d. The electrons closest to the nucleus of the atom
Answer:
A is the correct answer
Answer:
A. The electrons farthest from the nucleus of the atom
Explanation:
In which year were the populations of light and dark colored moths the most different?
Answer: 1900
Explanation:
I’m not sure but in 1900 98% of the moths were dark
1. Which property measures the space taken up by an object?
A hardness
B mass
C. volume
D. weight
Define physical and chemical properties, provide three examples of each, DISCUSS THEIR REVERS ABILITIES, and
explain the fundamental differences between them.
I really need the reverse abilities.
Explanation:
the physical and chemical has different meaning
and the three examples are to discuss, reverse
and the ability.and to reverse the ability is to provide
the physical and chemical definement.
People can obtain groundwater by drilling a well
Answer:
yes this is I think a true statement
The process of raising fish in a controlled area for the purpose of feeding the human population is called
Answer:
AQUACULTURE
*Explanation*
Aquaculture is the controlled process of cultivating aquatic organisms, especially for human consumption. It's a similar concept to agriculture, but with fish instead of plants or livestock. Aquaculture is also referred to as fish farming.
Explain how a true acid wave, with a pH below 7.0, can cause the hair to swell.
Answer:
Services raise the pH in the hair to a alkaline state in order to soften and swell the hair shaft. Disulfide, hydrogen, salt. Side bonds are responsible for the strength and elasticity of the hair. Altering these is what make wet setting, thermal styling, permanent waving, curl reforming, and relaxing possible
A pH of 7 is neutral, a pH below 7 is acidic, and pH above 7 is alkaline. ... Chemical Texturizers raise the pH of the hair to an alkaline state in order to soften and swell the hair shaft. This action lifts the cuticle layer, and allows the solution to reach the cortex layer where restructuring takes place.
Explanation:
What TWO changes of state occur when thermal energy is TAKEN AWAY FROM/DECREASED in a substance?
Answer:
i’m sorry i don’t know
Explanation:
What force of attraction pulls everything towards Earth's center?
Answer:
Gravity is the force that pulls all objects in the universe toward each other. On Earth, gravity pulls all objects "downward" toward the center of the planet.
Explanation:
Answer:
Gravity
Explanation:
The force of gravity pulls everything toward the Earth.
how many electrons can fit in the third energy level
Answer:
18 electrons
Explanation:
When burning a campfire, how would the mass of the products of burning (ash, soot, etc.) compare to the mass of the wood and oxygen that were used during the burning?
A
the masses would be different
B
the masses would be the same
Answer:
A because this different
Answer:
B
Explanation:
the masses would be equal to the burning (ash, soot, etc.) to the wood and oxygen that were used during the burning since the law of conservation of mass says that matter can not be destroyed nor created.
Como se forman los gases contaminantes en el medio ambiente
Los principales mecanismos de contaminación en el medio ambiente son los procesos industriales que implica combustión,tanto en industrias como automóviles o calefacciones residenciales,que generan dióxido y monóxido de carbono, óxidos de nitrógeno y azufre,entre otros contaminantes.
what are some examples of irreversibilities and reverse abilities for physical properties and chemical properties?
Answer:
physical properties are examples of irreversibilities
and chemical properties are example of reverse abilities.
In the compound nitric oxide (NO), for every 14 grams of nitrogen (N),
there are how many grams of oxygen (O)?
a. 16
b. 8
C.14
Answer:
b
Explanation:
answer is b hope helpful
3. The set up below was used to collect gas K, produced by the reaction between water and calcium metal. Gask Water calcium Metal (b) At the end of the experiment, the solution in the beaker was found to be a weak base. Explain why the solution is a weak base
Ca(s) + 2H2O(l) = Ca(OH) 2(aq) + 2H2(g)
The gas K collected is hydrogen gas.
The solution after the experiment is found to be weak base because Ca(OH)2 is sparingly soluble in water forming a weak base.
What does the enthalpy of reaction measure?
Answer:The amount of energy used or released as heat in a reaction.
Explanation:
Which term describes the materials magma is made of?
A. Extrusive
B. Intrusive
C. Molten
D. Cooled
Answer:
molten hi i eat apples and bananas
6. Model conservation of mass in a labeled drawing that illustrates a physical change.
Answer:
hope it's help you
Explanation:
In an isolated system, neither chemical processes nor physical changes can create or destroy mass, according to the principle of mass conservation. According to the law of conservation of mass, the mass of the products and reactants of a chemical reaction must be equal.
Why is mass conservation crucial?According to the law of conservation of mass, matter cannot be created or destroyed in a chemical reaction. When wood burns, for example, the mass of the soot, ashes, and gases equals the original mass of the charcoal and oxygen when it first reacted. As a result, the product's mass equals the reactant's mass. The understanding that substances do not, contrary to appearances, vanish as a result of a reaction, but rather change into another material of equal mass, was made possible by the law of conservation of mass, which was essential to the development of chemistry. The law of conservation of mass does not always apply.To learn more about mass conservation refer to:
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compare the temperature and thermal energy of hot soup in a small mug and that of hot soup in a large bowl
Explanation:
Both have the same temperature, but the large bowl of soup has more thermal energy than the small mug because there is more matter present in the bowl.
The temperature of both the bowl is same , but the thermal energy of large bowl is more than the thermal energy of small bowl.
What is thermal energy?Thermal energy is defined as the energy of an object or system due to the movement of its molecules and atoms. It is produced with rise in temperature.
It is also defined as internal energy present in a system in the state of thermodynamic equilibrium by virtue of its temperature.
Thermal energy is also known as heat energy.
Thermal energy is directly proportional to mass of the object.
Thermal energy sources include natural gas, coal, and oil, as well as solar, heat pump electric, and geothermal heat.
Thus, the temperature of both the bowl is same , but the thermal energy of large bowl is more than the thermal energy of small bowl.
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write at least on paragraph about space exploration and why it interests you. The moon can certainly be your focus however, you may be interested in exploring other planets within or outside our own solar system.
hahahahhaahahahahhahacbhad
In order for hydrogen bonding to occur, the compound has to have a
hydrogen attached to one of three atoms. Which of the following is NOT
one of those three atoms?
Nitrogen
Fluorine
dh, Chlorine
Oxygen
what's going to be in the he World
Answer:
Lots of people set the alarm with the best of intentions, knowing that's the time they need to get up to meet the day's demands. But then the alarm clock seems to ring way before they're ready to rise, so they're hitting snooze and, eventually, running late. Something's got to give.
The key lies inside your body. "An important factor in being able to wake up easily at the desired time in the morning is the timing of one's circadian rhythm, or 'body clock,'" says sleep researcher Leon C. Lack, PhD, professor emeritus in the school of psychology at Flinders University in Adelaide, Australia. Much of what you need to do to wake up on time starts by planning your sleep schedule the day and the evening before — and by making your mornings count.
How do our internal clocks work, and how much can we control them? According to the National Institutes of General Medical Sciences (NIGMS), the body’s master clock, located in the brain, produces and regulates our circadian rhythms, which help determine sleep patterns over the course of a 24 hour period. Environmental signals, such as daylight and darkness, affect circadian rhythms, too. When incoming light hits the optic nerves, information is passed along from the eyes to the brain. When there is little or no light — at night — your clock tells the brain to make more melatonin, a hormone which makes you sleepy.
Our sleep-wake cycles, hormone levels, metabolism, and body temperature are all affected by our circadian rhythms, notes the National Institute of Neurological Disorders and Stroke. When your rhythm is off, you may be at risk for more than just a few groggy days you drag yourself through. Irregular rhythms, the NIGMS notes, have been linked to chronic health conditions, such as obesity, diabetes, depression, bipolar disorder, and seasonal affective disorder.
But there are ways to recalibrate your system to get the sleep you need and wake up feeling refreshed and ready for the day ahead. Physiological and psychological factors come into play, and it’s not always easy to get a good night’s rest or adhere to a schedule so that you consistently go to sleep and get up around the same time each day.
is going on