Answer:
Volume of the cube is 2*2*2 = 8cm^3.
Divide the weight (40g) over the volume (8cm^3).
Density is 5g/cm^3. Definitely not gold.
Explanation:
Yes, the given golden-colored cube is gold .The density of gold is 32 gm/cm³ and we must buy it.
What do you mean by density?Density is a mass of a unit volume of a material substance.
The formula for density is d = M/V, where d is density, M is mass, and V is volume.
Density is commonly expressed in units of grams per cubic centimetre.
To calculate density-
given
mass=40gm
side of cube =2cm
therefore, volume=(side)³
=8cm³
density=?
density=mass/volume
density=40/8
density=5 gm/cm³
The handed golden-colored cube is gold with its density 5gm/cm³ and hence we must buy it.
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The experimental group is the group that is left alone during the experiment
Answer:
The given statement is false.
Explanation:
A common method of experimentation that is used to collect data on hypotheses of end up causing-effect is a contrast between two groups. One community, the experimental group, is receiving medication for having any result. Some other group becomes left exposed, the control group, whether creating a different treatment.both questions pls !!
Answer:
b and C
Explanation:
Round 2.6765 to two significant figures
Answer:
2.7 Significant Figures
Explanation:
The two significant figure value is "2.7".
Significant figures:Users were required to round up the given value, 2.6765, to two significant numbers in this challenge. Since the given number has no zeroes, all the digits are significant. Therefore, if we need and round the given number to 2 major digits, the number should only have two numbers.
Then we must select if the last digit to be preserved will be scaled up or down, and this will be determined either by digit following the last digit to be retained.Whereas if the digit after the last digit to be kept is greater than 5, the last digit should be rounded up.A digit following the last digit to be kept in the supplied number is 7, which is more than 5, hence using the aforementioned concept, So, the round figure value is "2.7".Therefore, the round figure value is "2.7".
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Why water is a compound but air is a mixture?
Answer:
Explanation-
Water is a compound because it is formed from hydrogen and oxygen, which is irreversible, having different properties but air is a combination of different gases in any proportion.
Which of the following is a physical
change?
A iron rusting under water
B copper turning green in the air
C solid iodine subliming into a gas
D hydrogen and oxygen producing water
Answer:
C. solid iodine subliming into a gas
Explanation:
A physical change is a change that is reversible and can be reversed back into the original product. The atoms and molecules undergoes some rearrangement in the physical change. The process of change in the state of matters are placed under physical change. Solid iodine sublimes into purple gas on heating. The gas is then changed back to iodine crystals after being cooled. Hence, this is an example of a physical change.
is evaporation of water a physical change or a chemical change ?
Answer:
Physical
Explanation:
Water is the chemical form of 2 hydrogen and 1 oxygen (H2O)
It is still H2O, as nothing made it chance that formula.
I need to do this but i really don’t know what to write about so can everyone help me and just put something nice i should put
Answer:
Just say you expect all the help you need.
Explanation:
Say that you expect to get as much help as you can and that you expect to he welcomed and loved
is saliva a element compound or mixture
Answer:
mixture
Explanation:
Answer:
mixture
Explanation:
3. All the water found on Earth's surface, below ground, and as a liquid in the
atmosphere makes up the
_________
Answer:
hydrosphere
Explanation:
When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change? because the metal reaches a high temperature because the metal begins to melt because a new substance is formed because the metal is malleable
Answer:C
Explanation: on Edge
Answer: letter c is the answer
Explanation:
How are thermal energy and mass related?
Answer:
s
Explanation:
s
Answer:
Both reflect the kinetic energy of moving particles of matter. However, temperature is the average kinetic energy of particles of matter, whereas thermal energy is the total kinetic energy of particles of matter. ... Another factor also affects thermal energy. The other factor is mass
Explanation:
Which of the following equations best describes the energy at point
C, assuming energy is conserved?
O A. PEA= KEC
o B. PEA= KEc + PEC
C. PEg= KEC + PEC
O D. PEg = PEC
Answer:
The correct option is
B. PEA = KEC + PEC
Explanation:
The potential energy is the energy possessed due to position
From the image the point with the highest position and therefore the most potential energy and the lowest or zero kinetic energy is point A
Given that we have;
Total mechanical energy = The potential energy + The kinetic energy
Where there is constant total mechanical energy in the system, then, at the point A where the kinetic energy is zero, the potential energy is equal to the total mechanical of the system, we have;
Total mechanical energy = The potential energy at A = PEA
Total mechanical energy = PEA
At point C where we have the total mechanical energy presented as follows;
Total mechanical energy = Kinetic energy at C + Potential energy at C
Total mechanical energy = KEC + PEC
Therefore;
PEA = KEC + PEC.
Claim: If I brush my teeth everyday, then I won't get cavities.
In this statement, the dependent variable is
I
Answer:
I wont get cavities it the dependent variable
Explanation:
Describe the many different forms of energy involved with stretching and releasing a rubber band. What other processes are similar to this model?
Answer:
Conversion of kinetic energy to potential energy (chemo mechanical energy)
In the state of rest, the rubber is a tangled mass of long chained cross-linked polymer that due to their disorderliness are in a state of increased entropy. By pulling on the polymer, the applied kinetic energy stretches the polymer into straight chains, giving them order and reducing their entropy. The stretched rubber then has energy stored in the form of chemo mechanical energy which is a form of potential energy
Conversion of the stored potential energy in the stretched to kinetic energy
By remaining in a stretched condition, the rubber is in a state of high potential energy, when the force holding the rubber in place is removed, due to the laws of thermodynamics, the polymers in the rubber curls back to their state of "random" tangled mass releasing the stored potential energy in the process and doing work such as moving items placed in the rubber's path of motion such as an object that has weight, w then takes up the kinetic energy 1/2×m×v² which can can result in the flight of the object.
Explanation:
Answer:
Elastic potential energy------> kinetic energy --------> elastic potential energy
Explanation:
Elastic potential energy is the energy stored in a spiral spring. When a rubber band is stretched, this elastic potential energy is capable of doing work. This energy is just stored inside the rubber band and released when work is done by the rubber band.
Once the rubber band is released and it is in motion, the energy of the rubber is kinetic energy.
The system is similar to a simple pendulum.
Which of the following equations can be used to solve volume of a solution using
molarity equation?
Answer:Molarity can be used to calculate the volume of solvent or the amount of solute. The relationship between two solutions with the same amount of moles of solute can be represented by the formula c1V1 = c2V2, where c is concentration and V is volume.
Explanation: c1V1 = c2V2
The equation that can be used to solve the volume of a solution using the molarity equation is:
Molarity (M) = moles of solute (mol) / volume of solution (L)
This equation can be rearranged to solve for the volume of solution:
Volume of solution (L) = moles of solute (mol) / Molarity (M)
By knowing the molarity of the solution and the number of moles of solute, you can substitute these values into the equation to calculate the volume of the solution.
It's important to note that this equation assumes the molarity is given in units of moles per liter (mol/L). If the molarity is given in a different unit, it may need to be converted before using the equation.
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Your question is incomplete, but most probably your full question was.
Which of the following equations can be used to solve volume of a solution using molarity equation?
Volume moles ÷ molarity
Volume-moles + molarity
Volume moles + molarity
Volume = moles x molarity
what is astrobiology
Answer:Astrobiology, formerly known as exobiology, is an interdisciplinary scientific field concerned with the origins, early evolution, distribution, and future of life in the universe.
Explanation:
Answer: the branch of biology concerned with the study of life on earth and in space.
Explanation: Astrobiology is an interdisciplinary scientific field concerned with the origins, early evolution, distribution, and future of life in the universe. Astrobiology considers the question of whether extraterrestrial life exists, and if it does, how humans can detect it.
why is a graduated cylinder most appropriate for measuring the volume of a liquid instead of a beaker ?
Answer:
Graduated cylinders are designed for accurate measurements of liquids with a much smaller error than beakers. They are thinner than a beaker, have many more graduation marks, and are designed to be within 0.5-1% error. ... Therefore, this more precise relative of the beaker is just as critical to almost every laboratory.
Explanation:
hope this helped!
.Put 8.4 x 10^-6 into standard notation.
Answer:
.0000084
Explanation:
How do you find significant figures in numbers?
Answer:
Significant Figure Rules
Non-zero digits are always significant.
All zeros between other significant digits are significant.
The number of significant figures is determined by starting with the leftmost non-zero digit. The leftmost non-zero...
The rightmost digit of a decimal number is the least significant digit or least significant figure. Another way to look...
Explanation:
10. How does a heterogeneous mixture differ from a homogeneous mixture? How are they similar?
Why do scientists believe that virus diversity, virosphere is unimaginably vast?
Answer:
Explanation:
no no knows
Answer:
I wish I was a scientist
Calculate the average atomic mass of boron (B), which has two isotopes: B-10 with 19.9% natural abundance, and B-11 with 80.1% abundance. Average atomic mass of boron = (f1)(M1) + (f2)(M2) Question 13 options: 12.1 amu 10.8 amu 9.2 amu 3.3 amu
Answer:
The average atomic mass of boron is found to be
10.80
Explanation:
also u answered it urself
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. Therefore, the average atomic mass of boron is 10.80amu. The correct option is option B.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)
Substituting the given values
Average atomic mass=( 10 amu × 19.9%)+(11 amu × 80.1%)
Average atomic mass=10.80amu
Therefore, the average atomic mass of boron is 10.80amu. The correct option is option B.
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1. Form a hypothesis: As altitude increases, the air pressure decreases. How do you think the lower pressure will affect the following? (Circle your answers.) A. Freezing point: Increase, Stay the same or Decrease B. Melting point Increase Stay the same Decrease C. Boiling point: Increase Stay the same Decrease
Answer:
A. Freezing point: Increase.
B. Melting point: Decrease
C. Boiling point: Decrease
Explanation:
As we go up in higher altitudes the air becomes on and less dense, hence the decrease in the water vapor content at such altitude leads to a decrease of boiling point. Thus the air above is cool and much colder than at the ground surface. The vapor pressure is temperature-dependent and thus melting point will also decrease.Answer:
A increase
B decrease
C decrease
Explanation:
What does the term division of labor mean as it relates to cells?
Answer:
what each cells job is divided
Explanation:
What is callibration of temperature
ouch that hurts
What is Temperature Calibration? Temperature calibration refers to the calibration of any device used in a system that measures temperature. Most importantly, this usually means the temperature sensor, itself, which is typically a platinum resistance thermometer (PRT or PT-100), thermistor, or thermocouple.
The Gateway Arch in St. Louis, MO is approximately 630 ft tall. How many U.S. half dollars would be in a stack of the same height? Each half dollar is 2.15 mm thick.
Answer:
The number of half dollars in the stack of the height of the Gateway Arch in St. Louis is 89,313 half dollars
Explanation:
The given height of the Gateway Arch in St. Louis = 630 ft
The thickness of each half dollar = 2.15 mm
By conversion of factors, we have;
1 feet = 304.8 mm
Therefore;
630 ft. = 304.8 × 630 mm = 192,024 mm
The number of half dollars that will stack up to 630 ft or 192,024 mm, is therefore, given as follows;
The number, n, of half dollars in the stack of the height of the Gateway Arch in St. Louis = The height of the Gateway Arch in St. Louis/(The thickness of each half dollar)
n = 630 ft/(2.15 mm/(half dollar)) = 192,024 mm/(2.15 mm/(half dollar)) = 89,313.49 ≈ 89,313 half dollars
The number of half dollars in the stack of the height of the Gateway Arch in St. Louis = 89,313 half dollars.
Which of the following has a crystalline structure?
Answer:A copper-gold alloy has a crystalline structure
Explanation:
What are the parts of this water wheel system?Label the water wheel to show the matter and forms of energy that flow through the system?
Answer:
Water, wheel and paddles or bucket are the parts and mechanical energy is produced.
Explanation:
The parts of water wheel system are water, wheel and paddles or bucket. The main purpose of water wheel system is to generate useful energy by using the flowing or falling of water on the wheel. We use this water wheel system for the conversion of kinetic energy into mechanical energy such as water mill or hydroelectric plant in which the blades movement is responsible for the generation of electricity.
what will happen reaction of rubidium with water 
Answer:
reaction of rubidium with water
Explanation:
rubidium metals react very rapidly with water to form a colourless solution of rubidium hydroxide ( RbOH) and hydrogen gas H2
differentiate between melting point and boiling point
Answer:
The main difference between boiling point and melting point is that the melting point is defined as the temperature at which solid and liquid phases are in equilibrium, whereas the boiling point is the temperature at which the vapour pressure of a liquid is equal to the external pressure