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.
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
Which of the following is an example of using creativity while doing background research?
Organizing data in tables
Validating results by repetition
Drawing a conclusion
Writing a hypothesis
Answer:
B
Explanation:
Answer:
D. Writing a hypothesis
Explanation:
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
Four 5-gram blocks of metal are sitting out in the sun and absorb the same amount of heat energy. Use the following specific heat capacity data to determine which block will increase its temperature the most.
Substance Specific Heat Capacity (cal/g°C)
iron 0.11
copper 0.09
silver 0.06
lead 0.03
iron
copper
silver
lead
Answer:
lead
Explanation:
During radioactive decay, atomic nuclei of unstable isotopes
a.
give off nuclear radiation.
b.
are broken down by radioactive bacteria.
c.
form chemical bonds.
d.
are unchanged.
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
Where did the mass of the forest trees come from? What happens to that mass when the forest burns?
Answer:
when the forest burns all the trees die and the ground becomes more fertile.
The mass of forest trees is due primarily due to the presence of carbon in them. When the forest burns the mass is not destroyed as burning does not cause changes in matter.
What is the law of conservation of mass?
Law of conservation of mass is a law which states that during a chemical reaction mass is neither created nor destroyed.Rather it is the only form of the matter which changes.
In chemistry, the law of conservation of mass can be stated as during a chemical reaction the mass of products is always equal to the mass of the reactants.
This law is important in chemistry as it helped scientists to understand that during a chemical reaction substances do not disappear rather they are transformed to new substances of equal mass.
Law of conservation of mass was given in the year 1774 by French chemist Antoine Lavoisier and hence is also known as Lavoisier's law.
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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.
4 Al(s) + 3 O2(g) --> 2Al2O3 (s) What mole ratio would you use to convert from the given quantity of moles of aluminum to the wanted unit of moles of aluminum oxide?
Answer:
1:2
Explanation:
For every 4 moles of aluminum, there are 2 moles of aluminum oxide, so the mole ratio when converting from aluminum to alunmimum oxide is
2 moles aluminum oxide:4 moles aluminum. This can be simplified to 1:2.
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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!
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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Sprinkler powder on the carron board _________ friction
Answer:
Sprinkler powder on the carron board reduce friction.
.Put 8.4 x 10^-6 into standard notation.
Answer:
.0000084
Explanation:
Why do scientists believe that virus diversity, virosphere is unimaginably vast?
Answer:
Explanation:
no no knows
Answer:
I wish I was a scientist
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 was there no increase in the reaction rate with 8 g of substrate as compared to 4 g of substrate?
Answer:
Equilibrium over-saturated
Explanation:
In both were excessively-saturated in volume equilibrium and much more molecules would be required to see a growth in reaction rate.
So, we can say that there was no increase in reaction rate.
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.What does the term division of labor mean as it relates to cells?
Answer:
what each cells job is divided
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.
3. All the water found on Earth's surface, below ground, and as a liquid in the
atmosphere makes up the
_________
Answer:
hydrosphere
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.
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
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:
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.
Use the table to answer the questions. What is the fastest time trial for the first quarter checkpoint? What is the slowest time trial for the first quarter checkpoint? What is the range of times measured for this checkpoint? All answers in seconds
Answer:
25
Explanation:
Answer:
Explanation:
What is the fastest time trial for the first quarter checkpoint?
2.02
seconds
What is the slowest time trial for the first quarter checkpoint?
2.15
seconds
What is the range of times measured for this checkpoint?
0.13
seconds
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:
is saliva a element compound or mixture
Answer:
mixture
Explanation:
Answer:
mixture
Explanation:
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.
Extensive properties _______________ useful for identifying a substance because the substance may be present in any _______________. Some _______________ properties, such as _______________, aren't useful either.
Answer: Extensive properties such as the mass, volume and entropy of systems are additive for subsystems, useful for identifying a substance because the substance may be present in any physical properties. Some intensive properties, such as temperature, refractive index and density, aren't useful either.
Explanation: According to scientific studies, Physical properties of materials and systems can often be classified as being either intensive or extensive, according to how the property changes when the size (or extent) of the system changes. Based on IUPAC classification, an intensive quantity is one whose magnitude is independent of the size of the system whereas an extensive quantity is one whose magnitude is additive for subsystems. This explains the corresponding mathematical ideas of mean and measure, respectively.