Answer:
Q = - 18830.9 J
Explanation:
Given data:
Mass of water = 85 g
Initial temperature = 55°C
Final temperature = 2°C
Amount of heat lost = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of water 4.18 j/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 2°C - 55°C
ΔT = -53°C
Q = 85 g × 4.18 j/g.°C × -53°C
Q = - 18830.9 J
Negative sign shows that heat is released.
1. If a cell has waste it needs to store, it will store it:
Which of the following is a problem caused by acid rain?
1 -is a factor in global warming
2-causes depletion of the ozone layer
3-respiratory problems in humans
4-makes lakes and streams unsuitable aquatic life
Answer:
1
Explanation:
is a factor in global warming
Answer:
sulfur dioxide from coal fired plants in Tennessee
Explanation:
Got it right on the quiz :)
Atoms of which element have the most valence electrons?
O A. Neon (Ne)
O B. Chlorine (CI)
O C. Nitrogen (N)
O D. Oxygen (0)
Explanation:
neon has 8valence electrons
chroline has 7 valence electrons
nitrogen has 5 valence electrons
oxygen has 6 valence electrons
so neon has the most valence elctrons
PLEASE HELP DUE BY FEB 4TH PLEASE HELP PICTURE IS ATTACHED
Answer:
4. is the troposphere
5. is the lithosphere
6. is the hydrosphere
7. this would be lithosphere (land), hydrosphere (water), biosphere (living things) and atmosphere (air)
8. this would be the goesphere and atmosphere.
note: hope this helps :)
Could someone help?
All forces require an input of ______
- mass
- energy
- speed
- atoms
Answer:
Mass
Explanation:
I majored on Chemistry
Answer:
Mass
Explanation:
All forces require an input of mass
A company needs a substance for a new product that is a good electrical insulator, is lightweight, and can withstand high pressures. Which type of scientist should the company contact for help? Choose the correct answer.
geophysicist
organic chemist
material scientist
analytical chemist
The company should contact with a material scientist to better know which materials can provide the needs that they demand. Hence option c is correct.
Who are material scientists ?The chemical composition and structure of many man-made and natural materials are investigated and analyzed by materials scientists. In order to learn more or acquire new information, glass, rubber, ceramic, alloys, polymers, and metals are all explored and investigated.
Using what they have learnt, materials scientists then come up with methods to mix materials, reinforce existing materials, or develop whole new materials with specific features and characteristics for usage in a variety of applications and products.
A materials scientist develops techniques for evaluating certain materials to find out how they react to various environmental factors. They also design laboratory tests to assess the plausibility of methods and processes used to produce novel materials with enhanced properties.
Therefore, the company have to contact a material scientist.
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HELP true or false: if all the bonds in a molecule are polar the molecule is a polar molecule
BRAINLIST!!
A river flowing through a floodplain shapes the region through the processes of weathering, erosion, and deposition. Which of the following is an example of the river forming a depositional feature?
A.
As the water's speed increases, it scours deep grooves in the muddy river bottom.
B.
As the water flows along the outside edge of a curve, it removes rock and soil from the river bank.
C.
As the water's speed decreases along the inside edge of a curve, sediment is laid down to form a point bar.
D.
all of these
Answer:
B
as the flows along the outside edge of a curve it removes rock and soil from the river bank
2. In the space below, describe why it rains. Include the words that scientists use
when talking about how water changes from liquid to gas and back to liquid
again
An atom has 9 protons and 7 electrons. What is its overall charge?
Answer:
Positive
Explanation:
If an atom has more protons than electrons, its overall charge will be positive. Protons have a positive charge, electrons have a negative charge.
1. Electronegativities of the elements Be, Mg, Ca, and Sr follow a specific trend within their group. Based on this trend, the atoms of which element will have the least attraction for an electron?
A) Be.
B) Mg.
C) Ca.
D) Sr.
2. Which element has a larger atomic radius than sulfur?
A) Chlorine.
B) Cadmium.
C) Fluorine.
D) Oxygen.
3. Which ion was formed by providing the second ionization energy to remove an electron?
A) Ca2+.
B) N3–.
C) Fe3+.
D) S2–.
4. The most negative electron affinity is most likely associated with which type of atoms?
A) Large nonmetal atoms.
B) Small nonmetal atoms.
C) Large metal atoms.
D) Small metal atoms.
5. Selected properties of antimony (Sb) and iodine (I) are listed in the table below.
Element AtomRadius(pm) 1st IonEnergy(kJ/mol) ElectroAffinity(kJ/mol) Electronegative
Sb 145 ? –103 2.05
I 140 1008 –295 ?
Which predictions can most likely be made?
Sb has a lower ionization energy but a higher electronegativity than I.
Sb has a higher ionization energy but a lower electronegativity than I.
Sb has a lower ionization energy and a lower electronegativity than I.
Sb has a higher ionization energy and a higher electronegativity than I.
6. Which correctly summarizes the trend in electron affinity?
A) It tends to be very high for group 2.
B) It tends to be more negative across a period.
C) It tends to remain the same across periods.
D) It tends to be more negative down a group.
7. Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?
A) The ionization energy decreases because the ratio of the protons to electrons increases.
B) The ionization energy increases because the ratio of the protons to electrons increases.
C) The ionization energy decreases because the ratio of the protons to electrons decreases.
D) The ionization energy increases because the ratio of the protons to electrons decreases.
8. Which element would most likely have an electron affinity measuring closest to zero?
A) Na.
B) Al.
C) Rb.
D) Ar.
9. Electronegativities of the elements Na, Al, P, and Cl follow a specific trend across the period. Based on this trend, an electron will be most strongly attracted to
A) Na.
B) Al.
C) P.
D) Cl.
10. Which best describes ionization energy?
A) Energy needed to add an electron to a neutral atom in the gas phase.
B) Energy needed to add an electron to a neutral atom in the liquid phase.
C) Energy needed to remove an electron from an atom or ion in the gas phase.
D) Energy needed to remove an electron from an atom or ion in the liquid phase.
Answer: B D B A C B E D A B
Explanation:
please answer the (a)
Answer:
a) 30
b) 45
Explanation:
A compound has a percent composition of 24.74% potassium (molar mass = 39.10 g/mol), 34.76% manganese (molar mass = 54.94 g/mol), and 40.50% oxygen (molar mass = 16.00 g/mol).
Assuming that the mass of the compound is 100 g, what is the compound’s empirical formula?
Answer: KMnO4
Explanation:
Car 1 has a body made from aluminium and car 2 has a body made from steel. Which car is likely to
have the better fuel economy?
Answer:
1
Explanation:
Um well if a car is made out aluminum keep in mind the engine = heat and stuff the type of stuff that would burn would cause chemicals/ white flame to form the trioxide aluminum(lll) oxide, Al small 2 O small 3. With Steel this would burn off bits of rust/ion oxide
I could be wrong but thats the best answer i can give sorry mate
why is snow a better insulator than ice?
Answer:
Snow is a better insulator than ice because snow contains air packets inside it and air is a good insulator of heat. Due to this, snow takes longer time to melt than the ice of the same mass.
Explanation:
Snow contains air packets inside it; air is a good heat insulator
Which of the following materials has the highest density?
A. O water vapor
B. O steam
C. O liquid water
D. O ice
Answer:
Answer is C. liquid water.
Explanation:
I hope it's helpful!
Liquid water has the highest density. Therefore, the correct option is option C among all the given options.
What is density?The density of a substance is defined just like its weight per unit volume. In other words, density is the mass-to-volume ratio or mass for every unit volume. It quantifies how much "stuff" a thing possesses in an unit volume (cubic meter or cubic centimeter).
Density is a measure of how closely stuff is packed together. The density principle was established by the Greek scholar Archimedes, which is simple to compute if one know the equation and its associated units. Lquid water has the highest density.
Therefore, the correct option is option C among all the given options.
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Which of the following would support the theory that electrons are identical for all elements?
Answer:
what are the following?
This is also for a test
The forces : = 90 N, moving right, unbalanced forces
Further explanationGiven
The forces acting on an object
Required
The net force
Solution
Net force : the sum of all forces acting on an object
We agree that the move up and to the right is a positive sign, while down and to the left is a negative sign.
If we look at the net force, the direction of the forces are to the right (both forces, 60 N and 30 N)⇒horizontal motion
the same direction, add the forces
the opposite direction, subtract the forces
Unbalanced forces, the object will move
The object will not move if forces are balanced (net force = 0)
So the net force :
= 60 N + 30 N
= 90 N to the right
How many elements are in this chemical formula?
2(NH4)2SO4
Your answer
Answer:
4
Explanation:
Nitrogen (N)
hydrogen (H)
sulfur (S)
oxygen (O)
9 of 16
9.
A student drops a ball from 5 feet above the ground. After bouncing once, it only reaches
a maximum height of 4 feet above the ground.
Use energy terms to explain why the ball did not reach its original height after bouncing
once.
A. Some energy was lost
B. Some energy was transferred to the floor and air
C. Some energy disappeared when it hit the floor
D. Some energy was destroyed
A process that releases heat, such as freezing or condensation is called?
Answer:
exothermic
Explanation:
An exothermic reaction gives off heat energy. Condensation is the process by which water vapor turns into liquid water. This typically occurs when water vapor molecules come into contact with cooler molecules. This causes the water vapor molecules to lose some energy as heat which is a exothermic reaction.
When water becomes a solid, it releases heat, warming up its surroundings. This makes freezing an exothermic reaction.
Which of the following atoms could an alkaline earth metal (family 2) form an ionic bond with? Sulfur Argon Sodium
Explain your answer. __________________________________________________________
_______________________________________________________________________________
Answer:
Sulfur (but not argon or sodium.)
Explanation:
In an ionic bond, one atom would completely lose one or more electrons while the other atom would completely gain those electrons.
For that to happen, the first atom needs a strong tendency of losing electrons. The second atom needs a strong tendency of gaining electrons.
Atoms of metals tend to lose electrons. On the other hand, atoms of nonmetals tend to gain electrons.
Alkaline earth metals (IUPAC group [tex]2[/tex]) include elements such as magnesium and calcium. Like many other metals, alkaline earth metal atoms tend to lose electrons. Atoms of elements that form ionic bonds with alkaline earth metal atoms should tend to accept electrons.
Among the choices for the other element in this ionic bond:
Sodium is an alkaline metal. Sulfur is an IUPAC group [tex]6[/tex] non-metal. Argon is a noble gas.Because sodium is a metal, it is unlikely that sodium would accept electrons from alkaline earth metal elements. Rather, sodium might form an alloy (with metallic bonds rather than ionic bonds) when melted and mixed with alkaline earth metals.
Sulfur is a non-metal and is right under oxygen in group [tex]6[/tex] of the periodic table. Like atoms of other nonmetals in that group, sulfur atoms tend to gain electrons and could readily form ionic bonds when mixed with alkaline earth metal elements.
Argon is a noble gas. Noble gas elements are considerably chemically inert. They seldom react with other elements. Even if they do so, they tend to form covalent bonds rather than ionic bonds. In practice, alkaline earth metals such as calcium may even be stored in containers filled with argon to prevent the metal from reacting with oxygen in the air.
Which animals/insects look different from their young?
What is the yearly exposure from wearing a watch with a luminous dial?
Atoms of which two elements have a combined total of 23 protons?
A.Sodium, Na, and magnesium, Mg
B.Boron, B, and carbon, C
C.Copper, Cu, and zinc, Zn
D.None of these
Answer:
A
Explanation:
Sodium has 11 electrons and Magnesium has 12 electrons. Since here you need to consider atoms, they must have equal amount of protons as electrons to be considered neutral, and so an atom.
So simply 11+12 =23
what are ions and how do they work please send me answer
Answer:
hope it helps
please mark me brainliest
Explanation:
An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.
Fill in the blank with the correct number to balance the equation 4Cr +3O2 -> CR2O3 (enter only a whole number)
Answer:
The balanced equation is given below:
4Cr + 3O₂ —> 2Cr₂O₃
Explanation:
From the question given above the following equation was obtained
4Cr + 3O₂ —> Cr₂O₃
The equation can be balance as illustrated below:
4Cr + 3O₂ —> Cr₂O₃
There are 4 atoms of Cr on the left side and 2 atoms on the right side. It can be balance by writing 2 before Cr₂O₃ as shown below:
4Cr + 3O₂ —> 2Cr₂O₃
Now the equation is balanced.
Explain why atoms increase in size when the atom gains electrons.
i need help please this is due today
how many moles of sodium chloride are in a 122 gram sample