Answer:
1) Metalloids Metalloids, also called semiconductors, are the elements that border the zigzag line on the periodic table. Chemical Symbol Each square on the periodic table includes an element's name, chemical symbol, atomic number, and atomic mass.
2) Atom – the smallest particle into which an element can be divided and still be the same substance. 2. Electrons – the negatively charged particles found in all atoms.
3) Electrons are the negatively charged particles of atom. Together, all of the electrons of an atom create a negative charge that balances the positive charge of the protons in the atomic nucleus. ... The mass of an electron is almost 1,000 times smaller than the mass of a proton.
4) Carbon-13 (13C): The carbon isotope whose nucleus contains six protons and seven neutrons. This gives an atomic mass of 13 amu. six neutrons, resulting in an atomic mass of 12 amu.
5) Atoms are constructed of two types of elementary particles: electrons and quarks. Electrons occupy a space that surrounds an atom's nucleus. Each electron has an electrical charge of -1. Quarks make up protons and neutrons, which, in turn, make up an atom's nucleus.
6) Neutrons are the particles in an atom that have a neutral charge. They aren't positive like protons. They aren't negative like electrons.
7) The current model of the atom shows an atom that is mostly empty space. In the center is a small nucleus made of protons and neutrons.
8) The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in any atom is its mass number minus its atomic number. Although all atoms of a given element must have the same atomic number, they need not all have the same mass number.
9) Mendeleev arranged the elements in order of increasing relative atomic mass . When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend .
10) Letter: C
Which statements best describe the first stage of cellular respiration? Check all that apply.
The stage happens in cytoplasm.
The stage happens in mitochondria.
Oxygen combines with small molecules.
Glucose is broken down.
Energy is released.
( 20 points) HELP ME QUICK IM TIMED
Answer:b
Explanation:
Answer:
The correct answer is The stages happens in the cytoplasm.
Explanation:
Explanation:Cellular respiration helps in the complete breakdown of carbohydrates basiclly glucose to form carbon dioxide,water and ATP molecules as energy source.Aerobic respiration consist of 3 principle steps
The first step is called glycolysis which deals with the catabolism of glucose into pyruvate by 10 enzymes catalyzed reactions.
Glycolysis occurs in the cytoplasm as many of the glycolytic enzymes are present in the cytoplasm of the cell in which the glycolysis is occuring.
Balance the following equation: H2O(l) → H2 (g) + O2 (g)
Answer:
2 H2O(l) → 2 H2(g) + O2(g)
Explanation:
H2O(l) → H2 (g) + O2 (g)
Add 2 to both sides:
Reactants: Products:
H: 2+2=4 H: 2+2=4
O: 1+1=2 O:2
2 H2O(l) → 2 H2(g) + O2(g)
Therefore it is balanced, hope this helps.
All of these elements are metals except?
Metals
1. Copper
IronGoldLeadAluminumSilverZincTinNon metals
CarbonSulfurOxygenHydrogenNitrogenExplanation:
Hope this helps!!!
PLEASE HELP MEEE!!!!!!!!!
-If you took a sample of Aluminum and reduced it to the smallest possible particles of pure aluminum, what would you be left with?
Answer:
It can be described as an atom
Which of the following is/are TRUE about heat transfer?
w. heat energy can never be transferred.
x. heat flows from cooler to hotter object.
y. heat travels from hotter to cooler object.
z. heat can transfer through convection, conduction, and radiation
Group of answer choices
x and y
y and z
w and z
w and x
plz choses one of the answer choices
Answer:
B
Explanation:
It adds so there are 4 aluminum on both sides as well as 6 oxygen on both sided.
Answer:
B. would be the correct option.
Explanation:
To balance the equation, both the reactant and product must have the same number so with 4Al+30 with two on the bottom, you would get a total of 4 Al atoms and 6 O atoms. Now, the other side must have 4 Al atoms and 6 O atoms, so multiply them by 2 and that would be your answer.
classify the following chemical reaction
2Li + Cu(No3)2 → Cu + 2 LiNO3
Answer:
im on this question i need help with it as well lol
Explanation:
In order to draw a Lewis structure, it is important to ______. *
a. determine the atomic number of each atom in the molecule
b. add unshared pairs of electrons only around nonmetal atoms
c. determine the total number of valence electrons in each atom
d. determine the electronegativity of each atom
Answer: C. Determine the total number of valence electrons in each atom
Explanation: That’s the main thing that a Lewis structure/ e-dot diagram shows!
.
Which of these halogens is the least reactive
on the Period Table?
1) I 2) Br 3) CI 4) F
Answer:
Chlorine I guess.
Explanation:
none
How many molecules of carbon dioxide are found in 2.50 moles of carbon dioxide?
PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
There are 1.51 x 1024 molecules of carbon dioxide in 2.50 moles of carbon dioxide.
Explanation:
Which of the below statements are true? A. There can be a change in heat (kJ) without the temperature changing by. Heat remains constant through a change of state c. Temperature changes through a change of state d. Heat and temperature are the same
Answer:
A. There can be a change in heat (kJ) without the temperature changing by.
Explanation:
A. There can be a change in heat (kJ) without the temperature changing by.
This is correct. It is what happens whenever there is a change in state.
B. Heat remains constant through a change of state
This is incorrect. During change of state like boiling, the amount of heat changes.
c. Temperature changes through a change of state
This is incorrect. During boiling, the temperature is fixed at 100 celcius
d. Heat and temperature are the same
This is incorrect. Heat refers to the total energy of the molecule. Temperature on the other hand is a measure of how hot or cold something is. Plus they have different units.
Example of genetic biodiversity
Answer:
Different breeds of dogs.
Different varieties of rose flower.
Explanation:
You mix 10g of sugar into 100ml of water and 5g of salt into the same volume. Which is more soluble? Would it matter what temperature it was? Use the words solute, and solvent in your answer.
Answer:
Answers are in the explanation.
Explanation:
A solution is the mixture of 2 or more substances in which the substance in less amount is the solute and the substance must abundant is the solvent.
The more soluble solute is the one that can be dissolved in the biggest amount. As there are dissolved 10g of sugar and 5g of salt, the more soluble is sugar
Normally, the solutes are more solubles when the temperature increases. If you can't dissolve a solute, you can try heat it and probably it would be dissolved.
What atoms are present in the water molecule?
Answer:
hydrogen and oxygen
Explanation:
h20=1hydroden 2 oxygen
Answer: To calculate the number of molecules and atoms in a water drop, you need to know the chemical formula of water. There are two atoms of hydrogen and one atom of oxygen in each water molecule, making the formula H 2 O. So, each molecule of water contains 3 atoms. Molar Mass of Water
Explanation:
Which object has the most potential energy? A ball resting on the ground. A ball being thrown at 100 miles per hour. A ball on top of a refrigerator. A ball resting on the edge of a cliff.
Answer:
The correct option is a ball resting on the edge of a cliff.
Explanation:
A ball resting on the edge of a cliff is the correct option because it has the most potential energy and this is because potential energy is the energy stored by an object or energy posses by an object due it is position. It is the energy at rest.
A ball resting on the edge of a cliff indicate that the ball is a t rest, and it's possess energy base on its position relative to it's zero position.
Answer:A ball resting on the edge of a cliff.
Explanation:
If you observed a beam of particles being bent towards a negatively
charged plate, what might you conclude?
Answer:
The particles did not have a positive charge.
1s2 2s2 2p6 3s2 3p6 Atoms of an element, X, have the electronic configuration shown above. The compound most likely formed with magnesium, Mg, is..... (a) MgX (b) Mg2X (c) MgX2 (d) MgX3 (e) Mg3X2
The question is incorrect, the correct question is:
1s2 2s2 2p6 3s2 3p3
Atoms of an element, X, have the electronic configuration shown above. The compound most likely formed
with magnesium, Mg, is
a. MgX
b. Mg2X
c. MgX2
d. Mg2X3
e. Mg3X2
Answer:
e. Mg3X2
Explanation:
Let us reexamine the electronic configuration of atom X; 1s2 2s2 2p6 3s2 3p3 .
This implies that it is a member of group 15 whose outer electronic configuration is ns2 np3. Members of group 15 have a valency of 3.
Therefore, during exchange of valence, the subscript of X becomes 2 (valency of magnesium) and the subscript of Mg becomes 3(valency of X).
Hence the formula is Mg3X2 as shown in the answer.
The branch of science which deals with chemicals and bonds is called chemistry.
The correct option is D.
The representation of electrons in their shell is called electronic configuration. To find the element we have to count the electrons in it.
The total number of electrons is 2+2+6+2+6 = 18 which is argon a noble gas element.
The valency of the magnesium is 3, Hence the compound they will make is[tex]MgAr_3[/tex].
Hence the correct option is D that is MgX3.
For more information, refer to the link:-
https://brainly.com/question/25026730
What mass does 2.41 moles of copper have?
A 632 g
B 280 g
C 153 g D 352 g
E 820 g
When using a dichotomous key, it is ok to start wherever you want.
True
O False
Answer:
False
Explanation:
Pay attention to the specimens you are trying to identify with your dichotomous key. List down the characteristics that you can notice. For example, say you are trying to classify a group of animals. You may notice that some have feathers whereas others have legs, or some have long tails and others don’t.
Which answer choice describes the noble gases?
Answer:
have a full outer electron shell
Explanation:
Complete the passage to describe velocity vs time graphs.
A velocity vs time graph is a graph that shows the relationship between the velocity of an object over time.
is plotted on the x-axis in seconds, and the
of the object is plotted on the y-axis in
meters per second.
Intro
Done
Answer:
20.6 kg
Explanation:
Answer:
20.6 kg
Explanation:
What side of the equation are the products found?
(Balancing Chemical Equations Using Models Worksheet)
Answer:
The right
Explanation:
Every elements atoms are the same.
True
False
Answer:
Two atoms of the same chemical element are typically not identical. ... Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different.
Explanation:
I have added 12.0 L of air.To a balloon at sea level(760 torr). If I take the ballon with me to Colorado, where the air pressure is 0.650 atm, what will the new volume of the balloon be?
Answer:
18.46 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V1) = 12.0 L
Initial pressure (P1) = 760 torr
Final pressure (P2) = 0.650 atm
Final volume (V2) =..?
Next, we shall express the pressure in the same unit of measurement.
Thus, 760 torr is equivalent to 1 atm.
Finally, we shall the new volume of the balloon as follow:
Initial volume (V1) = 12.0 L
Initial pressure (P1) = 1 atm
Final pressure (P2) = 0.650 atm
Final volume (V2) =..?
P1V1 = P2V2
1 × 12 = 0.650 × V2
12 = 0.650 × V2
Divide both side by 0.65
V2 = 12/0.65
V2 = 18.46 L
Therefore, the new volume of the balloon is 18.46 L.
At standard pressure, the total amount of heat required to completely vaporize a 100. gram sample of water at its boiling point is
Answer:
The heat of vaporization relates the amount of heat required to transform a certain phase of a certain amount of substance from liquid to gas. The heat of vaporization of substances can be expressed in terms of joules per gram or joules per mole.
ExplanaDetermine the total amount of heat, q, that is required to evaporate the given amount of water at its boiling point. For this problem, we simply apply the equation,q
=
m
Δ
H
v
a
p
where m is the mass and
Δ
H
v
a
p
is the enthalpy of vaporization of water. We use the following values:
m
=
100
g
Δ
H
v
a
p
=
2.26
k
J
/
g
We proceed with the solution.
q
=
m
Δ
H
v
a
p
=
(
100
g
)
(
2.26
k
J
/
g
)
=
226 k
j tion:
How the kidneys filter wastes from the blood?
Each of your kidneys is made up of about a million filtering units called nephrons. Each nephron includes a filter, called the glomerulus, and a tubule. The nephrons work through a two-step process: the glomerulus filters your blood, and the tubule returns needed substances to your blood and removes wastes.
Each of your kidneys is made up of about a million filtering units called nephrons.
Each nephron includes a filter,
called the glomerulus, and a tubule. The nephrons work through a two-step process:
the glomerulus filters your blood,
and the tubule returns needed substances to your blood and removes wastes
Forces and Motion:Question 10
Which is the best statement about an object in motion?
Select one:
The object will eventually always stop.
0
The object will keep accelerating.
The object will remain in motion until it experiences an unbalanced force.
o
The object will always slow down
Answer: The object will remain in motion until it experiences an unbalanced force.
Explanation: If you know about Newton's law of physics or whatever it is called, you will find that and object will always keep moving, until it is stopped by an outside force.
I need help with this
Answer:
To fulfill the octet rule
Explanation:
A gas has an initial volume of 2.4 L at a pressure of 1.5 atm and a temperature of 273 K. The pressure of the gas increases to 4.5 atm, and the temperature of the gas increases to 313 K. What is the final volume of the gas? 0.70 L 0.92 L 6.3 L 8.3 L
Answer:
Final volume of the gas v2 = 0.92 L (Approx.)
Explanation:
Given:
Initial volume v1 = 2.4 L
Pressure p1 = 1.5 atm
Temperature t1 = 273 K
New pressure p2 4.5 atm
New temperature t2 = 313 K
Find:
Final volume of the gas v2
Computation:
p1v1 / t1 = p2v2 / t2
(1.5)(2.4) / 273 = (4.5)(v2) / 313
v2 = 0.9172
Final volume of the gas v2 = 0.92 L (Approx.)
About two centuries ago Ben Franklin showed that 1 teaspoon of oil would cover about 0.5 acre of still water. If you know that 1.0x10^4 m^2 = 2.47 acres, and that there is approximately 5 cm^3 in a teaspoon, what is the thickness of the layer of oil?
Answer:
Explanation:
2.47 acre = 10⁴ m²
.5 acre = .2024 x 10⁴ m²
= 2024 m²
volume of oil = 5 x 10⁻⁶ m³
If thickness be t
volume of oily layer = area x thickness
= 2024 x t = 5 x 10⁻⁶
t = 5 x 10⁻⁶ / 2024
= 2.47 x 10⁻⁹ m
= 2.47 nm .
