Answer:
false
Explanation:
Atoms make up everything and are made up of protons, neutrons, and electrons.
Hoped this helped!
56.75mL of 0.256 HI M reacts with 10.00mL sample of NaOH, what is the molarity of sodium hydroxide?
Answer: 1.45M
Explanation:
The definition of molarity is moles/liter. The neutralization of NaOH with HI is:
HI + NaOH = NaI + H2O
One mole of HI reacts with 1 mole of NaOH. We'll assume this is a titration reaction and that the 10.00ml sample of NaOH contains the same number of moles as the 56.75ml of 0.256M HI.
Moles HI: (0.256 moles/liter)*(0.05675 L) = 0.01453 moles HI
That means we muct have 0.01453 moles NaOH in 10.0ml of NaOH solution.
(0.01453 moles NaOH)/(0.010L) = 1.45 M
==
Another approach is to use the relationship M1V1 = M2V2, which is useful for titrations (M is concentration and V is volume):
We want M2, so rearrange: M2 = M1V1/V2
M2 = (0.256M)*(56.75ml)/(10.0ml)
M2 = 1.45M
Compare the type of change that occurs when a match is burnt and when a liquid starts boiling. Use complete sentences to justify the type of change that occurs. (10 points)
Answer: liquid boiling is a reversable chemical change.
Explanation: you can alter the temperature to prevent it from boiling
How can one separate and collect the solvent from a salt solution
Answer:
evaporate
Explanation:
after water or any other solvent has mixed with satt stirr the mixture then heat it the water will evaporate leaving the solute (salt) behind
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
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.
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.
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
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.
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.
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:
Which would be considered a substance? Element, Compound, Mixture.
Answer:
MIXTURE , ELEMENT AND SUBSTANCE
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:
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Answer:
B.
Explanation:
yan sagot ko tnx sa points
1 Which of the following is an example of periodicity?
a. eating breakfast
c. writing a letter b. hitting a home run d. sneezing
Answer:
A:UNDERSTANDING CONCEPTS PART A 13) Which of the following is an example of periodicity? A) eating breakfast
A carbonated drink is a
a. mixture of gases and liquids.
b. heterogeneous mixture.
C. mixture of two immiscible liquids.
d. compound.
Help!
Sodium and chlorine react to form sodium chloride. If there are 1.4 moles of sodium used, how many moles of chlorine were required?
Answer:
0.7 moles of Chlorine gas is required.
Explanation:
The reaction is balanced as follows:
2Na + [tex]Cl_{2}[/tex] ------> 2NaCl
According to stoichiometry,
2 mole Sodium reacts with 1 mole Chlorine gas
∴1 mole Sodium reacts with 1/2 moles of Chlorine gas
∴1.4 mole sodium reacts with 1.4/2 moles of Chlorine gas
= 0.7 moles of Chlorine gas
So, 0.7 moles of Chlorine gas is required.
Below is a diagram showing a metal being heated. What name is given to particle Y?
Enter your answer
Answer:
They're called free electrons.
The particle Y marked in the given diagram is electron and surrounding circles indicates metal atom or ions. Free electrons in metal lattice locates at the interstices of the crystal.
What are metals?Metals are electron rich elements exhibit higher thermal electrical conductivity. Metals are a pool of ions or electrons and therefore they form bonds with electronegative elements by donating electrons.
The interstitial sites of metal crystal lattice are occupied with free electrons and they can be transited to another sites or can be excited to get conductivity.
The electron transition from interstices provide the metal lattice some colors. The region from which an electron is transited is called F-center.
Therefore, the particle Y shown in the interstices of the metal lattice is electron.
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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.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
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.
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
H20 + C02...................
Answer:
NICE
Explanation:
TOES
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
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:
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.
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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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.
Learn more about enthalpy: https://brainly.com/question/15289741?
Answer:
10,148 kJ
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:
how many electrons can fit in the third energy level
Answer:
18 electrons
Explanation: