Answer:
The three main subatomic particles that form an atom are protons, neutrons, and electrons.
. The density of gold is 19.32 g/mL. A U.S. $5.00 gold coin has a diameter of 1.62 cm and a thickness of 0.085 cm. The price of gold is currently $53.90 per gram. What is the value of the gold in the coin. V = π r2 h.
Answer:
$182 is the value of the gold in the coin
Explanation:
Diameter is 2r, the ratio of the coin is = 1.62cm / 2 = 0.81cm
Following the formula of the volume of the coin:
V = π r² h
V = π*(0.81cm)²*0.085cm
V = 0.172cm³ = mL
As the density of the gold is 19.32g/mL, the mass of 0.1752mL of gold is:
0.1752mL * (19.32g / mL) =
3.385g is the mass of the coin
As the price of the gold is $53.90 / g, the value of the gold in the coin is:
3.385g * ($53.90 / g) =
$182 is the value of the gold in the coin-What number is 66.3% of 56?
-Find a number so that 25.5% of it is 10.
Answer:
17
39.21
Explanation:
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What is the relationship (direct or indirect) between wavelength of light and the energy of its photons?
Answer:
The energy of a wave is directly proportional to its frequency, but inversely proportional to its wavelength. In other words, the greater the energy, the larger the frequency and the shorter (smaller) the wavelength.
How many millimeters (mm) are in 25 meters? Also, pick the choice that shows the correct math work.
O Q025 mm; because 25 m x
1 m
1.000 mm
= 0.025 mm
1.000 mm
O 25.000 mm; because 25 m x = 25,000 mm
1 m
25.000 mm; because 25 m X
100 mm
= 2500 mm
1 m
O 0.025 mm; because 25 m x
1 m
100 mm
= 0.25 mm
Answer:
25000 mm: because 25 m × 1000 mm /1 m = 25000 mm
Explanation:
We can convert 25 m to millimetre (mm) by doing the following:
Recall:
1 m = 1000 mm
Therefore,
25 m = 25 m × 1000 mm /1 m = 25000 mm
25 m = 25000 mm
Thus, 25 m is equivalent to 25000 mm
10. In which of the following is the symbol for the ion and the total number of electrons it contains given correctly?
A Al3+ has 16 electrons
B S2- has 2 electrons
C Br1- has 34 electrons
D Ca2+ has 18 electrons
9. Which total mass is the smallest?
A The mass of 2 electrons
B The mass of 2 neutrons
C The mass of 1 electron plus the mass of 1 proton
D The mass of 1 neutron plus the mass of 1 electron
8. After measuring the ratio of the charge of a cathode ray particle to its mass, Thomson concluded that the particles
A Had no mass
B Had a very small mass
C Had a very large mass
D Carried a positive charge
Answer:
10. D
9. A
8. A or B
Explanation:
10. Calcium has 20 electrons, but the Calcium ion has 18 electrons.
9. The mass of electrons are negligible.
8. Electrons have a very small mass where some consider it to have no mass.
Questions below :) These ones are fairly easy :P
Answer:
See below.
Explanation:
1. The water here is the solvent, and the 'sugar and fruit specific chemicals' are considered the solute. That is as the solute is the component dissolved in the solvent.
2. The collision theory states that the greater the collisions, the greater the rate of reaction. When powdered sugar is placed in the water (solvent) it occupies more surface area, resulting in more collisions that speed up the rate of reaction, compared to a cube of sugar - that occupies less surface area. Therefore, the powdered sugar dissolved faster.
3. Molarity describes the number of moles of a substance per unit of volume. The standard unit of volume is liter, giving you the standard units (mol/l). Molality describes the number of moles per unit of mass, typically kilograms (mol/kg).
The concentration of a solution can be given in moles of solute dissolved per kilogram of solvent for molality, and moles of solute dissolved in liters of solvent for molarity. Molality is generally used for concentration.
Which statement is NOT a part of the scientific theory of cells? *
Answer:
I'm sorry but there is not enough context to answer your question.
Explanation:
Heat energy is necessary for evaporation to occur. Energy is used to break the bonds that hold water molecules together, which is why water easily evaporates at the boiling point. In fact the process of the evaporation removes heat from the environment . Which of these every day examples illustrates how evaporation removes heat from the environment ?
Answer:
As a result of the network of hydrogen bonding present between water molecules, a high input of energy is required to transform one gram of liquid water into water vapor, an energy requirement called the heat of vaporization. Water has a heat of vaporization value of 40.65 kJ/
Explanation:
What are 3 benefits of being a part of the microgrid?
Answer:
1.Improves electric reliability.
2.Enhance recovery.
3.Promotes clean energy.
Explanation:
Some people suffering from the darkness still had their lights from facilities with microgrids.Power outages they can be dangerous.Microgrids keep the power flowing by disconnecting.It also generate possibly batteries then the microgrids customers are served until power is restored on the Central grid.
100 POINTS A graph of gas pressure versus the number of particles in a container is a straight line. Which other relationship will have a similar graph? volume versus pressure, because they are also directly proportional volume versus temperature, because they are also directly proportional volume versus pressure, because they are also inversely proportional volume versus temperature, because they are also inversely proportional
Answer:
volume versus temperature, because they are also directly proportional
Explanation:
you can trust me
Answer:
volume versus temperature, because they are also directly proportional
Explanation:
the guy below me was correct
The "Atomic Number" is another way to refer to: a the number of atomic mass units b the number of neutrons c the number of electrons d the number of protons
Answer:
D. The number of protons.
If 25 g of CH4 and 100 g of O2 react, what is the total mass of the reactants and products?
Answer:
125g
Explanation:
you simply add the masses together
How is the periodic table organized?
Answer:
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
Explanation:
The periodic table is arranged in order of increasing atomic numbers of elements.
The periodic table is arranged in groups and periods. The elements in the same group have the same number of valence or outermost electrons while the elements in the same period have the same highest energy level.
According to the modern periodic law, the properties of elements are periodic function of their atomic numbers. Hence, the elements are found arranged in order of increasing atomic numbers from left to right in the periodic table.
Learn more: https://brainly.com/question/11155928
Which of the following defines the wavelength of a wave? A. the distance between peaks of a wave B. the speed that a wave is passed from particle to particle C. the loudness of waves that travel through the air D. the height of a wave between peak and trough
Answer:
D.the wavelength of a wave is the distance between two successive peaks or two successive troughs or a peak and trough
Answer:
My answer to the question is wavelength is the distance between two successful cress or successful troughs of a wave. which will be option A.
3.6 x 10^-3/2.1 x 10^6= 1.7 x 10^9
Answer:
(3.6×10^(-3))/(2.1×10^6) = 1.7×10^9 = False
Explanation:
How can a fire be extinguished?
Answer:
Answer below!
Explanation:
A fire can be extinguished by many forms like fire extinguisher, but the main is water. Water can extinguish fire.
THANK U
Answer:
The preferred method for extinguishing class “A” fires is to remove the heat. Water is the most common agent, but others such as dry chemical, halon, halogenated agents and foam can be used effectively. A class “B” fire involves flammable liquid or gas.
Explanation:
What is right hand thumb rule ?
Answer:
In mathematics and physics, the right-hand rule is a common mnemonic for understanding orientation of axes in three-dimensional space. Most of the various left- and right-hand rules arise from the fact that the three axes of three-dimensional space have two possible orientations
Explanation:
Answer:
In mathematics and physics, the right-hand rule is a common mnemonic for understanding notation conventions for vectors in 3 dimensions. It was invented for use in electromagnetism by British physicist John Ambrose Fleming in the late 19th century.
When choosing three vectors that must be at right angles to each other, there are two distinct solutions, so when expressing this idea in mathematics, one must remove the ambiguity of which solution is meant.
lead has a density of 11.3 g/ml, If you weigh an empty beaker and it weighs 245.61 g then add lead until the scale reads 350.52 g what is the volume of lead that you have?
Answer:
9.28ml
Explanation:
The density of Lead (Pb) can be calculated using the formula:
Density (g/ml) = Mass (g) / Volume (ml)
According to the question, the empty beaker weighs 245.61 g, then weighed 350.52 g when lead was added to it. This means that the mass of lead in the breaker is: 350.52 g - 245.61 g = 104.91 g
Hence, mass of lead= 104.91g, density of lead= 11.3g/ml
Volume = mass / density
Volume = 104.91/11.3
Volume= 9.284
Hence, the volume of lead is 9.28ml
Calculate the average acceleration of a car with a starting velocity of 0 m/s2 that accelerates to 9 m/s2 in 3 seconds.
Answer:
Explanation:
If the particle has a velocity of 4 m/s initially (at t=0) and has a constant acceleration of 2 m/s2, find the velocity of the particle: when t=1; when t=2; after t seconds.
The average acceleration of the car starting with a starting velocity of 0 meters/second and accelerating up to 9 meters/second in 3 seconds would be 3 meters/second².
What are the three equations of motion?There are three equations of motion given by Newton
The first equation is given as follows
v = u + at
the second equation is given as follows
S = ut + 1/2×a×t²
the third equation is given as follows
v² - u² = 2×a×s
As given in the problem we have to find the average acceleration of the car starting with a starting velocity of 0 meters/second and accelerating up to 9 meters/second in 3 seconds,
By using the first equation of motion
v = u + at
By substituting the value of velocities and time period in the first equation of motion,
9 = 0 + 3a
3a = 9
a = 9/3
a = 3 meters/second²
Thus, the acceleration of the car would be 3 meters/second².
Learn more about equations of motion from here,
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Why do some elements that are classified as metals not look metallic?
Answer:
So, that students like us get confuse!!!
Explanation:
Victoria grows the same bacteria in 20 petri dishes. She places 10 of the dishes in a container with a normal atmosphere. The remaining dishes she places in a container in which the oxygen level is double the normal level. She labels the first group "A" and the second group "B." Which statement best describes the groups?
Answer:
There are no options but the question can be answered based on general understanding of experimentation.
Group A: Control group
Group B: Experimental group
Explanation:
In an experiment, there are two groups viz: the control group and the experimental group. A control group is the group that does not receive any experimental treatment. It is considered the normal group while the experimental group is the group that is subjected to experimental treatment.
N.B: The experimental treatment in this case is the "Oxygen level"
According to the question, out of 20 petri-dishes used to grow bacteria, half (10) of the petri-dishes were placed in a container with normal atmosphere while the other 10 petri-dishes were placed in another container that have double the normal oxygen level. The first group of bacteria labelled GROUP A are the CONTROL GROUP because they were not given any treatment i.e placed under normal conditions while GROUP B are the EXPERIMENTAL GROUP because they are the group that received the experimental treatment (increased oxygen level).
what is the answer to this question?
Answer:
highlight the key words
Explanation:
conjunctions
Answer:
dont know but hey it is me ur freind lol
Explanation:
A diver is going through ocean search-and-rescue training. The graph shows the relationship between her depth and the time in seconds since starting her dive.
A. What details can you determine about the dive from the coordinates of the point (5, −8)?
Answer:
The answer is below
Explanation:
The graph is attached. The time in seconds (s) is plotted on the x axis and the depth in feet (ft) on the y axis.A positive depth is used to represent above the water and a negative depth means below the water.
From the graph, the point (5, -8) is the maximum depth in which the diver has traveled. This means that at 5 seconds, the diver was 8 feet below the water. After 5 seconds, the diver start to swim ul\p
Charlotte is driving at 58.6 mi/h and receives a text message. She looks down at her phone and takes her eyes off the road for 4.36 s. How far has Charlotte traveled in feet during this time?
Answer: 19.71 feet
Explanation:
Given: Speed of Charlotte =58.6 mi/h
Since 1 hour = 3600 seconds
and 1 mile = 5280 feet
So, Speed of Charlotte = [tex]\dfrac{58.6\times5280}{3600}\approx85.95[/tex] mi/ sec
She looks down at her phone and takes her eyes off the road for 4.36 s.
Since , Distance = [tex]\dfrac{speed}{time}[/tex]
So, Distance = [tex]\dfrac{85.95}{4.36}=19.71\ feet[/tex]
Hence, Charlotte traveled 19.71 feet during this time.
If an atom has 16 protons, 14 neutrons, and 18 electrons. What is the
charge of the nucleus? *
Answer: negative
Explanation:
There are two more electrons than protons so the charge is -2.
20 POINTS As a part of a laboratory investigation, Emily measured the volume of water in a graduated cylinder. Which of the choices correctly identifies the volume of water in the graduated cylinder? A. 38 mL B. 35 mL C. 37 mL D. 36.5 mL
Answer:
A.
Explanation:
Answer:
Actually both of ya are incorrect, it would be D. 36.5 mL, on study island it says that.
Explanation:
Explain how and why a drop of syrup can spread through the water in a beaker without stirring?
Answer:
See the answer below
Explanation:
A drop of syrup would spread through water because water molecules interact and dissolve the syrup molecules and the molecules of the syrup randomly diffuse into the water from the region of higher concentration to the region of lower concentration till they become evenly distributed in the water.
Once the molecules become evenly distributed into the water, an equilibrium is established and there is no longer net movement.
Choose ALL of the statements below that are stated as a hypothesis.
The brighter the color of an orange, the juicler the fruit
The faster a river flows, the greater the erosion.
Most apples are red, but some are yellow.
Baking powder is used in biscuits.
Brass contains copper and zinc.
Answer:
the first 2, the. rest are facts
12 points
What's the difference between a hypothesis and a theory?
A. Theory" is another word for "fact;" "hypothesis" is another word for "guess."
B. Hypothesis can't be proven; theories can.
C. Theories have been confirmed through tests; hypotheses haven't.
D. Theories contain many hypotheses; a hypothesis only contains one theory.
Answer:
C. Theories have been confirmed through tests; hypotheses haven't.
Explanation:
In simple terms, a theory is something that has been studied, tested, and validated with results whereas a hypothesis is when one "guesses" or "assumes" about something with no prior tests. In short, a hypothesis can be best understood as just a proposal while theory can be taken as a validated result.
Through various trials and tests, a theory arrives whereas a hypothesis can be the initial stage of the testing. For example, in saying that "My hypothesis is that this metal cannot bend" is just assuming or expressing one's opinion. But when the metal is tested and a definite result is found, then that becomes a theory.
So, we can say that a theory is a confirmed result after tests while a hypothesis is not tested or confirmed with a definite result.
Thus, the correct answer is option C.
1. Based on this graph, how does metal A differ from metal B?
A Metal A is have higher density than metal B.
B. Metal B has higher density than metal A.
C. Both metals A and B have the same density.
D. None of the abaove.
Answer:
B.Metal Bhaskar higher density than metal A