Answer:
A. I and II only
Explanation:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
Melting point also goes to decreases because there is large distance between the positive nucleus and bonded electrons thus overall attraction goes to reduced and less energy is required to melt.
You have 16.6 g of water at 40.2 C. How many Joules are needed to warm the water to 44.8 C?
Answer:
Q = 319.49 J
Explanation:
Given that,
Mass, m = 16.6 g
Initial temperature, [tex]T_i=40.2^{\circ} C[/tex]
We need to find the heat needed to warm the water to 44.8 °C. The formula that is used to find the heat required is given by :
[tex]Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\Q=16.6\ g\times 4.184\ J/g^{\circ} C\times (44.8-40.2)^{\circ} C\\\\Q=319.49\ J[/tex]
So, 319.49 J of heat is needed to warm water.
Which part of project management involves determining possible risks?
Answer:
Resources
Explanation:
Answer:
Explanation:
M
Different elements are most likely to react in similar ways when they
Answer:
Belong to the same group.
Explanation:
Different elements are most likely to react in similar ways when they belong to the same group.
This is because the elements in the same group always have similar number of valence electrons which implies that they all have the same number of electrons in their outermost shell. For example,barium (Ba), beryllium (Be), calcium (Ca), magnesium (Mg), radium (Ra), strontium (Sr) all have 2 electrons in their outermost shell and thus they belong to group 2 of elements which are known as Alkaline earth metals and they all tend to react in the same manner with other substances
The elements that has been belonging to the same group have been able to react in similar ways.
The reactivity of the elements has been based on the presence of the valence electrons. The elements that has been belonging to the same group have consisted of the same number of valence electrons with the increase in the number of shells moving from left to right.
Thus, the elements that have been belonging to the same group have consisted of the same reactive properties.
For more information about different elements, refer to the link:
https://brainly.com/question/17845581
When 50.0 mL of 1.000 M HCl is reacted with 50.0 mL of 1.000 M NH4OH, the solution's temperature increases 8.65 °C. Calculate qsolution in units of kJ. The specific heat of the salt solution is 4.184 J/g-°C and the density is 1.010 g/mL.
Answer:
Explanation:
Total volume of solution = 100 mL .
Total mass of the solution = 100 x 1.01 g
= 101 g
specific heat of solution = 4.184 J/g-°C
rise in temperature = 8.65 °C
heat released = mass x specific heat x rise in temperature
= 101 x 4.184 x 8.65
= 3655.35 J
= 3.655 kJ .
qsolution = 3.655 kJ .
In coastal ecosystems as sea otters populations decline sea urchins populations
Increased
Decreased
Remained the same
None of the above
Identify the following examples as either physical or chemical change.
(Ill give brainliest if right)
Answer:
19. Physical
20. Physical
21. Chemical
22. Physical
23. Chemical
24. Chemical
25. Physical
Explanation:
Which characteristic is related to kinetic energy but not potential energy
Answer:
kinectic is movement and potential is still
Explanation:
While kinetic energy of an object is relative to the state of other objects in its environment, potential energy is completely independent of its environment. Hence the acceleration of an object is not evident in the movement of one object, where other objects in the same environment are also in motion.
Answer:an object’s speed
Explanation:
2.
What did five different witnesses see in the area where Mary Lou Arruda
disappeared?
A. Mary Lou talking to an unknown man.
B. A green car driven by an unknown man.
C. Mary Lou's bicycle in the trunk of a green car.
D. An unknown man on foot following Mary Lou .
Answer:
c
Explanation:
I believe its c but i could be wrong sorry if I am
what is 14.235 rounded to the nearest tenth
Answer:
it would round down to 14.2
Explanation:
the 35 is below 50 so it goes down, and it rounds down to 14.2 instead of, if if was, say, 14.62 then that would round up bc the decimal is higher than 50.
but since it is 235, then it rounds down to 14.2
stay safe, TPWK!
identify the molar mass of na2(so4)3
Answer:
142.04 g/mol is the answer to your question.
Find the kinetic energy of a 5kg bowling ball that is traveling 2 meters per second
Explanation:
KE = ½ mv²
= ½ x 5 x 2² joule
= 10 joule
4. Hot material in the Earth's mantle rises and cool material
sinks. This is an example of
a. conduction
b. convection
c. radiation
d. none of these
Answer:
Th answer is b. convection.
Explanation:
As the heat rises it cools down and it sinks and as the cold sinks it heats up so then it rises back up.
how would one convert 36 yd to centimeters?
Answer:
3291.84 cm
Explanation:
you would multiply the amount of yards you have by 91.44, since that's how many centimeters there are in 1 yd.
Answer: it’s D
Explanation:
What does an increase of 1 pH number represent?
Answer:
A one-point pH change indicates the strength of the acid or base has increased or decreased tenfold; a 2-point change indicates a 100-fold change in acidity or alkalinity, and a 3-point change in pH indicates a 1000-fold change. Examples: • An increase in pH from 7.0 to 8.0 means the water is 10 times more basic.
Explanation:
what layer of the Earth is made of liquid metal?
Answer:
the outer core
Answer:
The outer core
I NEED THIS ASAP PLEASEE
what is the partial pressure of nitrogen dioxide gas in psi in a sealed vessel that has a total pressure of 2558 psi and partial pressures of 54.6 bar for carbon dioxide?
Answer:
121.8bar
Explanation:
The partial pressure is the pressure a gas would exert if it were alone in the volume of the gas mixture;
Given parameters:
Total pressure = 2558psi
Partial pressure of carbon dioxide = 54.6bar
Unknown:
Partial pressure of nitrogen dioxide gas = ?
Solution:
Total pressure = partial pressure of carbon dioxide + partial pressure of nitrogen dioxide gas
Let us convert from psi to bar;
14.504psi = 1 bar
2558psi = [tex]\frac{2558}{14.504}[/tex] = 176.37bar
Now;
Partial pressure of nitrogen oxide = 176.37bar - 54.6bar = 121.8bar
Answer:
1766 psi
Explanation:
The first step is to convert 54.6 bar into psi units, which is aproximately 791.9 psi. Next, subtract that from 2558 psi and you will get about 1766 psi.
Question 1 of 10
Which describes the law of conservation of matter?
O A. The reactants must have more atoms than the products.
B. The reactants must have fewer atoms than the products.
C. Atoms change into other elements during a reaction.
D. The same atoms must be in the products and the reactants.
SUBMIT
FIRST PERSON GETS BRAINLIEST IF RIGHT
Answer:
I think is D. The same atoms must be in the products and the reactants.
Explanation:
Explanation:
DThe same atoms must be in the products and the reactants.
2. The ions in an ionic compound separate from each other when
A. dissolved in water
B. when melted
C. when conducting electricity
D. never
Answer:
A. when dissolved in water
Explanation:
Water is an extremely polar molecule, meaning it has a positive end a negative end. When an ionic compound is dissolved, the positive pole of water will be attracted to the negative ion and attach itself to it. The same goes for the positive ions. That's how water breaks down ionic compounds
Answer:
ions do separate in an ionic compound because there is the free flow of electrons in the oppositely charged ions and conducts electricity in an aqueous form
What represents the identity of an element
Answer:
The identity of an element is its atomic number, which is the number of protons within the nucleus of one of its atoms.
Explanation:
formal units are formed by?
Answer:
However, when formal units are used to measure length, the measurement can usually be read from a scale on a ruler or tape, which shows units of a particular size. Unit iteration involves knowledge of repeatedly placing identical tightly packing units so that there are no overlaps or gaps.
Explanation:
Which statement best describes a difference between electromagnetic waves
and mechanical waves?
A. Mechanical waves can transfer matter through empty space.
B. Electromagnetic waves vibrate in two directions that are
perpendicular to each other.
C. Mechanical waves transfer matter, not energy, from one place to
another.
D. Electromagnetic waves require empty space to transfer energy
from one place to another.
Answer:
C
Explanation:
electronic waves transmits energy but mechanical waves require a medium in order to transport their energy from bgg one place to another.
Answer:
it is B.) Electromagnetic waves vibrate in two directions that are
Explanation:
stay safe 2021
What do you think happens to Difluoroethane at –24°C? Provide evidence to support your claim.
Answer:
The following subsections explain the explanation according to the particular circumstance.
Explanation:
The boiling point seems to be the temperature beyond which the working fluid as well as the boiling phase would be at a predetermined pressure or voltage at equilibrium among one another and. The vapor or boiling temperature of 1,1 difluoroethane seems to be -25oC at 1 atm, although as a gas it can remain at a higher temperature around -24oC.PLEASE HELP ME!!!
THE CHEM QUESTION IS...
Calculate the amounts of heat required for 25.0 g of water to change from 10°C to 30°C
Answer:
1045
Answer: 1045 J of energy was released on cooling the down the water from 20 °C to 10 °C.
Answer:
..............=2100
help me please I really need it
a) Magnesium, 2.8.2, Group number 2,Metals, They are not non metals.
b) Fluorine, 2.2.5, Group number7, Metal No, Non-Metal yes
c) Carbon, 2,2,2. Group number 4, Metal No, Non-Metal yes
_____________________________________Best Regards,'Borz'How do the farmers use the property of density of cranberries to harvest the crop?
5. What do the data in your graphs tell you? Explain in one or two sentences what trend the reader should observe in each of your graphs. (Science Lab Report, if you don't know what the answer is please don't answer-)
Answer:
Graphs are a common method to visually illustrate relationships in the data. The purpose of a graph is to present data that are too numerous or complicated to be described, and If the data shows pronounced trends or reveals relations between variables, a graph should be used.
Explanation:
literally bro i had the same answer for my actual project for edge
Answer: Graphs are a common method to visually illustrate relationships in the data. The purpose of a graph is to present data that are too numerous or complicated to be described, and If the data shows pronounced trends or reveals relations between variables, a graph should be used.
Explanation:
For the following problems, identify the substance as either an element, a compound, or a mixture. Write E for Element, C for compound, and M for mixture. 34. Silicon ___E__ 35. Salad dressing __M___ 36. Table Salt (NaCl) __C___ 37. Oatmeal with apples and raisins_____ 38. Lithium _____ 39. Copper Sulfate (CuSO4) _____
Answer:
Explanation:
34. E
35. M
36. C
37. M
38. E
39. C
What is the concentration of hplus ions at a ph=11
Answer: 10^-11
Explanation:
to find the concentration of H+ ions given the ph, we use the formula 10^(-pH).
so 10^-11
B. Drinking water can only be obtained
hom seawater by hallaka True. I False
Answer:
False
Explanation:
What is the importance of activity series?
The activity series of metals is an empirical tool used to predict products in displacement reactions and reactivity of metals with water and acids in replacement reactions and ore extraction. It can be used to predict the products in similar reactions involving a different metal.