Answer:
100
Explanation:
answer is to simple why it is 100.0 when you write the number down on your calculator it give you 100 because the last zero does not count
Which statement best describes a physical change? 1. Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same. 2. Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same. 3. Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same. 4. Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.
3. Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
A physical changes the physical properties of a substance, but not the chemical composition. If it changed the chemical composition, it would be a chemical change. Typically a physical change can be reversible. Therefore, some typical examples of a physical change are:
- melting
- transition to a gas
- textural change
- change in shape
- change in size
Answer:
Its 3. Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Explanation:
I just took the test
how many significant figures are in the following? 22.045
Answer:
5 significant figures
Explanation:
zeros between whole numbers are always significant
Answer:
[tex]\huge\boxed{Answer=> 5}[/tex]
Explanation:
Picture below of how to calculate significant figures.
⇒ The number of significant is... 5
⇒ And, the number of decimals is... 3
Therefore, The answer to your question & problem will be ( 5 significant digits ).
(Picture attached)
Convert 88.2°C into °F
Elements that can exist in two or more geometric patterns are called
Answer:
The answer is allotropes
Explanation:
As known by studying and research the ansqer came out to be allotropes
what does it mean to be in the path of totality science
Answer:
The track of the Moon's shadow across Earth's surface is called the Path of Totality. This path is typically 16,000 kilometers (about 10,000 miles) long but only 160 kilometers (100 miles) or so wide. In order to see the Sun totally eclipsed by the Moon you must be in the path of totality.
Explanation:
An organic compound composed of carbon and hydrogen connected only by double bonds is an ________. Group of answer choices
Answer:
Alkene
Explanation:
An organic compound with carbon and hydrogen and at least one double bond is an alkene. You can also have alkanes and alkynes.
Alkanes have single bonds. Alkynes have at least one triple bond.
Answer:
an alkene is an hydrocarbon that contains a carbon–carbon double
bond.
The term is often used as synonym of olefin, that is, any hydrocarbon containing
one or more double bonds.
Which of the following is a chemical property? Select one: a. The air pressure at sea level is higher than that in Denver, Colorado. b. Water boils at 100°C. c. The rusting of the joints of a metal children’s swing set.
Answer:
c. The rusting of the joints of a metal children’s swing set.
Explanation:
By definition, chemical property describes the ability of a substance to undergo a specific chemical change.
In the definition above, the key words are; "Chemical change".
Generally, chemical changes are irreversible. This means we just have t observe the options and pick the one that contains an irreversible change.
Upon doing ths, the correct option is;
c. The rusting of the joints of a metal children’s swing set.
This is because rusting is a chemical change and is irreversible.
.239cal=J joules. How many joules J are in 450cal?
Answer:
1.89
Explanation:
238cal = J joules
450cal = xJ joules
[tex] \frac{450}{238} = \frac{xj}{j} [/tex]
1.89 = x
450cal = 1.89J joules
In nature, where do fusion reactions take place?
Answer:
it takes place only at extremely night temperatures
Explanation:
I looked it up
Answer:
In nature, fusion reactions take place in the Sun and other stars.
Explanation:
Edmentum sample answer!!
Dawa ate junk food at breakfast and worried about the examination, which combined to give her an annoying case of acid indigestion. Suggest some ways to reduce the indigestion
6.02 x 1023
Significant figures
Answer:
It depends on the number of significant figures you are changing to
Explanation:
6.02×1023=6158.46
1 sig fig = 6000
2 sig fig = 6200
3 sig fig = 6160
4 sig fig = 6158
5 sig fig = 6158.5
6 sig fig = 6158.46
When solving significant figures you have to consider the number after each number like in the case of changing to two sig fig the number following one is five and when the number is up to or greater than five you add a value of one to the number before it. But in a case where the number is less than five you just leave it like that like in the case of changing to one sig fig
is calcium a metal, nonmetal, or metalloid?
Answer:
Calcium is a metal.
Explanation:
It is considered a metal because it is most likely to give away it's two valence electrons to reach Argon. All the elements in gray are metals.
help! science what usually has the greasiest density 1. plasma 2. liquid 3. gas 4. solid
Answer:soild
Explanation:
Answer:
I think that it is a solid that has the greatest density
what is sublimation
Answer:
Sublimation is the transfer or transition of a substance from the solid state to the gaseous state without passing through the liquid state .
(In simple terms ; Sublimation occurs when a substance changes from solid to gas without becoming a liquid)
Examples ;
Dry ice solid CO2CamphorExplanation:
Answer:
Sublimation is the transition of a substance directly from the solid to the gas phase without passing throught the intermedate liquid phase.
Explanation:
1.what causes a fire tornado to form ?
Which example is most likely an inorganic compound? A. methane, which is made of carbon and hydrogen B. glucose, which is a sugar made by plants C. sodium chloride, which is a salt D. human DNA, which is a molecule in cells
Answer:
C
Explanation:
Answer:
CCCCCCCCCC.
Explanation:
54,000,000 nanometers equals 0.000000054 megameters. true or flase
Answer:
true...
Explanation:
Please help!!!
Perform the following operation
and express the answer in
scientific notation.
9x102: 3x1012
Answer:
3 × 10¯¹⁰
Explanation:
9×10² ÷ 3×10¹²
The above expression can be simplified as follow:
9×10² ÷ 3×10¹²
Recall:
9 = 3²
9×10² ÷ 3×10¹² = 3²×10² ÷ 3×10¹²
Recall:
a^m ÷ a^n = a^(m – n)
3²×10² ÷ 3×10¹² = 3^(2 – 1) × 10^(2 – 12)
= 3¹ × 10¯¹⁰
Recall:
a¹ = a
3¹ × 10¯¹⁰ = 3 × 10¯¹⁰
Placing a sample of iron (II) oxide into a graduated cylinder makes the water volume increase 12.0 mL. The weight of the sample is 76.6 g. What is its density? (Round to the nearest hundredths) g/cm3
Answer:6.38
Explanation:D=76.6/12
Convert 75 miles/hour to km/s.
Explanation:
0.033528 Kilometers per second
One gallon is equal to 16 cups. One cup is equal to 8 ounces. Assume you have 10.24 ounces of milk. Convert this value to gallons. show work
Answer:
There 0.08 gallon in 10.24 ounces of milk.
Explanation:
It is given that,
1 gallon = 16 cups ....(1)
1 cup = 8 ounces ....(2)
We need to convert 10.24 ounces of milk to gallons.
From equation (2)
1 ounce = 1/8 cup
10.24 ounce = [tex]\dfrac{1}{8}\times 10.24=1.28\ \text{cup}[/tex]
From equation (1),
1 cup = 1/16 gallon
1.28 cup = [tex]\dfrac{1}{16}\times 1.28=0.08\ \text{gallon}[/tex]
So, there 0.08 gallon in 10.24 ounces of milk.
What is the temperature -71 oC expressed in Kelvin?
Group of answer choices
Answer: 202.15
Explanation:
-71°C + 273.15
= 202.15K
Round to 4 significant figures.
0.007062
Answer:
Hey there!
This is already rounded to four significant figures!
Zeroes after the decimal but before the 7 don't count, and 7, 0, 6, and 2 count as significant figures.
So, the answer would be 0.007062.
Let me know if this helps :)
4 significant figures are there in 0.007062.
What are significant figures?“The term significant figures refer to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.
The number of significant figures in an expression indicates the confidence or precision with which an engineer or scientist states a quantity.”
Zeroes after the decimal but before the 7 don't count, and 7, 0, 6, and 2 count as significant figures.
Hence, 4 significant figures are there in 0.007062.
Learn more about significant figures here:
https://brainly.com/question/14359464
#SPJ5
3. A 134.50 g sample of aspirin is made up of 6.03 g of hydrogen, 80.70 g of carbon, and 47.77 g of oxygen. What is the percent by mass of each element in aspirin?
Answer:
The percentage of mass of hydrogen in aspirin is 4.48%
The percentage of mass of carbon in aspirin is 60%
The percentage of mass of oxygen in aspirin is 35.5%
Explanation:
Given that,
Mass of sample of aspirin = 134.50 g
Mass of hydrogen = 6.03 g
Mass of carbon = 80.70 g
Mass of oxygen = 47.77 g
We need to calculate the percentage of mass of hydrogen in aspirin
Using formula for percentage of mass
[tex]\text{percentage of mass of hydrogen}=\dfrac{m_{h}}{m_{s}}\times100[/tex]
Put the value into the formula
[tex]\text{percentage of mass of hydrogen}=\dfrac{6.03}{134.50}\times100[/tex]
[tex]\text{percentage of mass of hydrogen}=4.48\%[/tex]
We need to calculate the percentage of mass of carbon in aspirin
Using formula for percentage of mass
[tex]\text{percentage of mass of carbon}=\dfrac{m_{c}}{m_{s}}\times100[/tex]
Put the value into the formula
[tex]\text{percentage of mass of carbon}=\dfrac{80.70}{134.50}\times100[/tex]
[tex]\text{percentage of mass of carbon}=60\%[/tex]
We need to calculate the percentage of mass of oxygen in aspirin
Using formula for percentage of mass
[tex]\text{percentage of mass of oxygen}=\dfrac{m_{o}}{m_{s}}\times100[/tex]
Put the value into the formula
[tex]\text{percentage of mass of oxygen}=\dfrac{47.77}{134.50}\times100[/tex]
[tex]\text{percentage of mass of oxygen}=35.5\%[/tex]
Hence, The percentage of mass of hydrogen in aspirin is 4.48%
The percentage of mass of carbon in aspirin is 60%
The percentage of mass of oxygen in aspirin is 35.5%
Why are fossil fuels like coal, oil, and natural gas
called nonrenewable resources?
Answer:
Because they cant be used again
Explanation:
like plastic is renewable because you can recycle it and it will be the same
Which of the following tells you the number of molecules in 1 mole of a gas?
O A. The atomic mass
O B. Avogadro's number
C. The molar mass
O D. The ideal gas constant
SUBMIT
Answer:
Avogrado's number
Explanation:
It's unniversal measure of moles
what is the density of an object having a mass of 4.0 g and a volume of 30 mL?
Answer:
8.324 Hope this helps! =)
2. how are firefighters expected to deal with them
In the video, the experimenter used a model to represent a phenomenon observed in the natural world. What did the light and each of the flasks represent in this model?
Answer:
The light represented the Sun, and each of the flasks represented the atmosphere, but with different compositions. One flask had a higher carbon dioxide concentration than the other.
Explanation:
Water flows over Niagara Falls at the average rate of 2,400,000 kg/s, and the average height of the falls is about 50 m. Knowing that the graviatational potential energy of falling water per second = mass (kg) x height (m) x gravity (9.8 m/s2), what is the power of Niagara Falls? How many 15 W LED light bulbs could it power?
Answer:
1) The power of Niagara Falls is 1.176 × 10⁹ W
2) The number of 15 W LED light bulbs it could power is 78.4 × 10⁶ light bulbs
Explanation:
1) The Niagara falls water mass flow rate = 2,400,000 kg/s
The height of the fall = 50 meters
The gravitational potential energy = Mass (kg) × height (m) × gravity (9.8 m/s²)
The power = The energy converted per second = Mass flow rate (kg/s) × height (m) × gravity (9.8 m/s²)
Therefore;
The power of Niagara Falls= 2,400,000 kg/s × 50 m ×9.8 m/s²= 1.176 × 10⁹ W
The power of Niagara Falls = 1.176 × 10⁹ W
2) The number, n, of 15 W LED light bulbs it could power is given by the relation;
n × 15 W = 1.176 × 10⁹ W
∴ n = 1.176 × 10⁹ W/(15 W) = 78.4 × 10⁶ light bulbs
The number of 15 W LED light bulbs it could power = 78.4 × 10⁶ light bulbs.