How does one recognize a periodic trend on the periodic table?
O A. Find elements in random positions of the periodic table.
B. Look for predictable changes and patterns.
O C. Look for all elements with 2 electrons in
any orbital.
D. Compare an element's properties to the properties of a noble gas.
Answer:
B. Look for predictable changes and patterns.Explanation:
Answer:
B
Explanation:
If you double the lenght of a wire, how does the resistance of the wire change?
and
If you make a wire twice as thick, how does the resistance of the wire change?
Answer:
If the length of a wire is doubled the resistance is shortened if it is thicker is is more durable due to the electrons having more room to spread out and flow through the wire
I hope this will help you
What is a source of energy that is internal to the
earth systems?
A. Sun
B. Moon
C. Tides
D. Radioactive decay
E. All of the above
Answer: The answer is D - radioactive decay
Explanation: I took the test and got this question correct.
A source of energy that is internal to the Earth's systems is radioactive decay which is option D.
The source of energy that is internal to the earth's systems is radioactive decay.
Radioactive decay is a natural process in which unstable atomic nuclei release energy in the form of radiation. The decay of radioactive isotopes found in the Earth's crust and mantle produces this energy. It contributes to the Earth's internal heat and is important in many geological processes, including plate tectonics and volcanic activity. Radioactive decay, unlike external sources such as the Sun, Moon, and tides, is a source of energy that begins within the Earth itself.
Therefore, the correct option is option d
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Which of the sun’s layers is called the sun’s furnace?
Answer:
The core of the sun
Explanation:
The core of the sun acts like a furnace. The sun's energy comes from nuclear fusion
If you increase the number of hours that you practice, you can score more goals in soccer.
a. Hypothesis?
b. How could you set up this experiment?
Answer:
A.Hypothesis
Explanation:
Answer:
Yes
Explanation:
Hypothesis: If i increase the number of hours i practice, then i will score more goals in soccer.
Set up. I would have two people who don't play soccer. One will be practicing for one hours every day, and the other will be practicing three hours every day. Based on my hypothesis, the person that is training three hours every day will score more goals than the person training one hour a day.
what’s the empirical and molecular formula for a compound with 20.2% sodium, 37.6% sulfur, 42.2%oxygen and a molar mass of 682.8g/mol?
Answer:
Empirical formula: Na3S4O9
Molecular formula: Na6S8O18
Explanation:
1) To find the empirical formula, which is the simplest whole number ratio of each element that makes up this unknown compound, we first divide the portion of each element by it's respective atomic mass.
Na= 23g/mol, S= 32g/mol, O=16g/mol
Na = 20.2/23 = 0.878mol
S = 37.6/32 = 1.175mol
O = 42.2/16 = 2.638mol
Next, we divide each number of moles by the smallest value (0.878mol)
Na = 0.878/0.878 = 1
S = 1.175/0.878 = 1.34
O = 2.638/0.878 = 3.004
Next, we multiply each decimal fraction by 3 to make it whole no:
Na = 3
S= 4.02 ~ 4
O= 9.012 ~ 9
The simplest ratio between Na, S and O is 3:4:9 hence, the empirical formula is Na3S4O9
2) To get the molecular formula, we use the molecular weight of each element in the empirical ratio, and the overall molar mass of the compound i.e.
Molar mass of compound= 682.8g/mol
molecular weight of Na3S9O4 = (3 x 23g/mol) + (4 x 32 g/mol) + (9 x 16 g/mol)
= 69 + 128 + 144
= 341 g/mol
Hence, (Na3S4O9)n = 682.8g/mol
= (341)n = 682.8
n = 682.8/341
n = 2.002
n~ 2
Hence, molecular formula = (Na3S4O9)2
= Na6S8O18
The empirical and molecular formula are Na₃S₄O₉ and Na₆S₈O₁₈
respectively.
The empirical formula can be gotten by dividing each element by it's
respective atomic mass.
Na= 23g/mol, S= 32g/mol, O=16g/mol
Na = 20.2/23 = 0.878mol
S = 37.6/32 = 1.175mol
O = 42.2/16 = 2.638mol
Then divide each number of moles by the smallest value which in this case is 0.878mol.
Na = 0.878/0.878 = 1
S = 1.175/0.878 = 1.34
O = 2.638/0.878 = 3.004
Next, we multiply each decimal fraction by 3 to make it whole no:
Na = 3
S= 4.02 ~ 4
O= 9.012 ~ 9
The simplest ratio between Na, S and O is 3:4:9 hence, the empirical formula is Na₃S₄O₉
The molecular formula is calculated by multiplying the molecular weight of each element with empirical ratio to get overall molar mass of the compound
Molar mass of compound is given as 682.8g/mol
Molecular weight of Na₃S₉O₄ = (3 x 23g/mol) + (4 x 32 g/mol) + (9 x 16 g/mol)
= 69 + 128 + 144
= 341 g/mol
Hence, (Na3S4O9)n = 682.8g/mol
= (341)n = 682.8
n = 682.8/341
n = 2.002
n~ 2
Hence, molecular formula = (Na₃S₄O₉)²
= Na₆S₈O₁₈
Snow that weathers buildings in a city is an example of: A mechanical weathering B acid precipitation carbonation D oxidation
Answer:
A
Explanation:
because its weathering them down.
On a cool morning, Uyen’s breath can form a cloud when she breathes out. Which changes of state are most responsible for Uyen seeing her breath in this way?
melting
condensation
deposition
sublimation
1. Matter can be measured in many ways for specific purposes. Which measurement depends on the force of gravity it is not reliable measurement?
A. Mass
B. Weight
C. Volume
D. Temperature
2. A bar of gold occupies a volume of 17.0cm3 and has a mass of 34.5g. What is the density of that bar of gold?
A. 2.1 ml/g
B. 2.0 g/cm3
C. 0.49 g/cm3
D. 0.51 ml/g
3. What volume of copper will weigh exactly 240g and have a density of 10.5g/cm3
A. 0.04g/cm3
B.18.2g
C.22.8g/cm3
D.21.4 cm3
Answer:
1. B- weight
2. B- 2.0g/cm3
3. C- 22.8g/cm3
Explanation:
an atom has 43 protons 55 neutrons and 44 electrons. what is the charge of the atom's nucleus?
Table:Question 1
All of these elements are metals except
Select one:
helium.
gold.
sodium.
aluminum
Answer:
Helium is nonmetal
Explanation:
At immense pressures (such as what exists in the center of gas giant planets like Jupiter and Saturn), both Helium and Hydrogen enter a metallic state, where both will conduct electricity. Helium turns into a liquid metal similar to Mercury. So, helium can be a metal.
Please make the following calculation and round your
answer to the correct number of significant figures:
103 x 3.327
Answer:
343
Explanation:
What does 120V AC stand for
120V is the AC voltage on a single hot wire in your home with respect to neutral (or ground). ... The 0V line in the middle is the voltage of your neutral line. AC power oscillates at 60 cycles per second (60 Hz) in the U.S. Other parts of the world use a 50Hz standard. The AC voltage oscillates from +120V to -120V
1. Naturally occurring europium (Eu) consists of two isotopes was a mass of 151 and 153. Europium- 151 has an abundance of 48.03% and Europium-153 has an abundance of 51.97%. What is the atomic mass of europium?
Calculate the volume of a cube having sides 3.0 cm in length
Answer: 27
Explanation:
3*3*3
you take l*w*h (3*3*3)
how does lithium change into a cation
Answer:
If it loses an electron it becomes a positive ion. Picture 1.8 Some atoms lose electrons and become positive ions. A lithium atom has 3 protons and 3 electrons. It can lose one of its electrons, making it an ion
Explanation:
An object is made from a material that is hard, shiny, and can be hammered into thin sheets.
Which of these is another likely property of the material?
1) it dissolves in water 2)I has a low boiling point. 3) it is a good conductor heat. 4) it’s density is less than that of water
Answer:
3) it is a good conductor heat.
Explanation:
An object is made from a material that is hard, shiny, and can be hammered into thin sheets. The aforementioned properties are those of a metal. Therefore, the other property of a metal is that, it is a good conductor of heat and even electricity because there valence (outer) electrons are delocalized. Some examples of chemical elements that are metals are iron, gold, sodium, silver, copper etc.
Water molecules stick together by a force called?
Answer:
Cohesion
Explanation:
Depending on how attracted molecules of the same substance are to one another, the substance will be more or less cohesive. Hydrogen bonds cause water to be exceptionally attracted to each other. Therefore, water is very cohesive.
Which of the following types of energy does an object store in the bonds of atoms and molecules? (5
points)
Chemical energy
Gravitational energy
Kinetis energy
Sound energy
Answer:
Chemical Energy
Explanation:
Answer:
yes
Explanation:
A 9.0 g of a mysterious substance was heated from 23.0°C to 85.0°C using 127 J of heat. To identify the substance we need to know the specific heat capacity of it. What is the mysterious substance’s specific heat capacity?
Answer:
0.228 J/g°C
Explanation:
The specific heat capacity, denoted by c, can be calculated using the formula:
Q = m × c × ∆T
Where; Q = amount of heat
m = mass
c = specific heat capacity
∆T = change in temperature
In this question, m = 9.0g, Q = 127J, T1 = 23°C, T2 = 85°C
Using, Q = m × c × ∆T
127 = 9 × c × (85-23)
127 = 9 × c × 62
127 = 558c
c = 127/558
c = 0.2275
c = 0.228 J/g°C
4) Ramon is playing soccer. The ball comes straight at him, and he kicks it to a player on his right. His kick is an example of A) a pull that stops the ball. B) a force that changes the roll of the ball. C) a pull that creates the motion of the ball. D) a force that changes the direction of the ball. Eliminate
Answer:
it's D my guy
Explanation:
Answer:
I took a usatestprep with this same question so i know the answer is D
Hopefully you find this helpful. :)
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In the vinegar and Salt solution, is it possible there was some other compound that formed on the egg shell instead of the food coloring? Based on what you know about the charge on the egg shell and the ions in the solution, what might have reacted to form a compound on the shell instead of the food coloring?
Answer: Most food dyes are acid dyes, so called because they only work in acidic conditions. The vinegar—a solution of 5 percent acetic acid in water—is there to bring the pH low enough that the dye will actually bind.
Explanation: Brainlest please
Guys please what is the answer of 6y+-2
Answer: 6y-2
Explanation: If it is not equal to something, then it will just be plain old
6y-2. Unless you have to graph it...
I was riding my bike the other day under some very big power lines on a trail and when ever i touched the brake handles it would shock me and when I was farther away from the power lines it wouldn't hurt as much.
Answer:
When the big power lines are down, electricity is going through the ground and up you bike to the handles, so when yo touch it, you are electrocuted
Explanation:
How many liquids are found on the periodic table?
1
There are six liquids found on the periodic table.
1. Bromine
2. Mercury
3. Caesium
4. Gallium
5. Rubidium
6. Francium
Suppose you made 40 atoms of Highlinium and it has a
half life of 2 seconds. How many Highlinium atoms would you expect to be
left after 6 seconds?
Answer:
After 6sec 5 atoms will be left.
Explanation:
Given data:
Total atoms of Highlinium = 40
Half life = 2 sec
Atoms left after 6sec = ?
Solution:
First of all we will calculate the number of half lives passes during 6sec.
Number of half lives = Time elapsed/ half life
Number of half lives = 6 sec / 2sec
Number of half lives = 3
Now we will calculate the number of atoms left
At time zero = 40 atoms
At 1st half life = 40 atoms/2 = 20 atoms
At 2nd half life = 20 atoms/2 = 10 atoms
At 3rd half life = 10 atoms / 2 = 5 atoms
Thus, after 6sec 5 atoms will be left.
Using the periodic table, predict which elements will have similar chemical
properties or reactivity?
A.Nitrogen, sulfur, and bromine
B. Rubidium, yttrium, and zirconium
C.Magnesium, strontium, and barium
D.Cadmium, calcium, and carbon
Answer:
C. Magnesium, Strontium, and barium
These four elements are in the same group or family. They are in the alkaline earth metals.
What is the circulatory system?
a. The system that helps you breathe.
b. The system that helps you move.
c. The system that transports blood.
d. The system that sends electrical signals.
Answer:
c
Explanation:
Answer:
C
Explanation:
The respiratory is breathing
The muscular system is the movement
In the same condition, what happens to the net force acting on the rope?
Answer:
Explained below
Explanation:
Newton's law of inertia states that An object at rest will remain continue at rest or if in motion, will continue in motion unless in both cases it is acted upon by a net external force.
Now, If two forces on the rope are equal and opposite forces, then the net force on the rope will be zero and it will not move. Thus,balance force is present in the rope and the rope will remain at rest since the net force is zero or it will continue in motion if already in motion without stopping since net force is zero
However, if the forces are acting in the same direction, it will result in an unbalanced force which means that the net force will be equal to the sum of the two forces and this will result in a stronger force than even the 2 individual forces and consequently it will cause the rope at rest to move, or if the rope is in motion, it will cause it to stop.
What does the measurement 45 N represent in the photograph?
A. The direction of the force
O B. The net force
O C. The magnitude (size) of a force
D. An action force with no opposite
SUBMIT
The measurement 45 N represent the magnitude (size) of a force in photograph. Therefore, option C is correct.
What is the magnitude of a force?The magnitude of the force is the number that represents the force's strength. Assume the force is 10 N in the direction of the east. The direction is indicated by 'towards east,' and the magnitude is indicated by '10'. Magnitude is thus the 'value' or 'amount' of any physical quantity.
The magnitude of force is expressed in mass times length times time squared. The most common metric unit is the newton (N), which is defined as one kilogram times one meter over one second squared.
Thus, option C is correct.
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