Answer:
2.040 cm
Explanation:
If we study the options closely, we will discover that the chosen option is exactly the same as the actual value of the length of the test tube.
Hence it follows that the option chosen in the answer represents the actual measurement of the length of the test tube as stated above
How does the area of the rectangle relate to the lengths of each side?
Answer:
A = l×b
Explanation:
Rectangle is a closed figure with 4 vertices. Each angle of a rectangle is 90 degrees. The opposite sides of a rectangle are equal.
Let l is the length of opposite sides of a rectangle and b is the breadth of the opposite sides of a rectangle.
The area of a rectangle is then given by :
A = l×b
i.e. area of a rectangle is equal to length times breadth.
please help me I need this answered ASAP. You take a 10-day trip across the country by car. At the beginning of the trip you zero the odometer and every evening you write down the odometer reading At the end of the trip you make a graph of cumulative miles travelled vs the day the measurement was taken
Which of the following do you think is true?
a) The mileage is the independent variable and the day is the dependent variable.
b) The day is the independent variable and the mileage is the dependent
variable.
C) Neither variable is independent or dependent
The image to the right is an odometer, which measures the number of miles traveled based on the rotation of the car's wheels This car traveled 91.308 miles
explain your reasoning
The day is the independent variable and the mileage is the dependent variable. Thus option B is correct.
What are the types of variables in experiment ?
Variables are the measurable parameter can be manipulated and controlled in research. For example person's eye color, its value can be changed from brown to blue depend on different factors.
An independent variable is a single character where Age is an example of an independent variable and dependent variable depend on other variable like it can be changed by other components.
Control variable remain constant and show no effect on other variables. It is used to prevent bias in an experiment. An intervening variable or mediator variable is another variable can modify the relationship between dependent and independent variables.
Thus option B is correct.
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which if the following questions can be answered by science?
Answer:
Need the choices before i can give answers thanks
Explanation:
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 miles will a person run in a 10 kilometers race
Answer:
6.2 Miles!
Explanation:
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%
1. Which of the following best describes the relationship
between cells and living things in general? *
O A The larger the living thing, the larger are its cells.
O B All living things are made up of one or more cells.
O c The number of cells in all living things is the same.
O D There is one kind of cell of which all living things are made.
What two units are typically shown on thermometers?
Answer:
Fahrenheit and Celsius
Explanation:
If the density of mercury is 13.6g/ml, what is the mass in grams of 3426 ml of the liquid?
A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, calculate the mass in grans of the cylinder. (Assume pi=3.14
Answer:
1. 46593.6g
2. 177065.856g
Explanation:
1. 13.6*3426=46593.6g
2. [tex]\pi r^{2}[/tex] = [tex]12^{2}[/tex] * 3.14=452.16 [tex]cm^{2}[/tex] (area of circle)
452.16*44.0=19895.04 [tex]cm^{3}[/tex] (volume of cylinder)
8.90*19895.04=177065.856g
≈177065.9g
Hope this helps.
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
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)
Definition of science
Answer: science is the systematic way of gaining knowledge about nature
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:
Convert 75 miles/hour to km/s.
Explanation:
0.033528 Kilometers per second
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
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.
1.what causes a fire tornado to form ?
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
Boojho wants to separate the following materials as combustible and non-combustible. Can you help him?
Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood
Combustible: Charcoal, straw, cardboard, paper, candle, wood.
Non-combustible: Chalk, stone, iron rod, copper coin, glass.
2. how are firefighters expected to deal with them
A cylinder container is filled with air. Its radius is 6.00 cm and
its height is 3.50 cm. What is the volume of air inside? (Use 3.14
for it)
Answer:
395.84cm³
Explanation:
V= π r² h
V= 3.14 6² 3.5
V= 3.14 36 3.5
V= 395.84
The volume of the air inside the cylinder is 395.64 cubic centimeters.
Given:
A cylinder container is filled with air. Its radius is 6.00 cm and its height is 3.50 cm.
To find:
The volume of the air inside the cylinder.
Solution:
The radius of cylinder = r = 6.00 cm
The height of the cylinder = h = 3.50 cm
The volume of the cylinder = V
The volume of the cylinder is given :
[tex]V=\pi r^2 h\\\\V=3.14\times (6.00 cm)^2\times 3.50 cm\\\\V=395.64 cm^3[/tex]
The volume of the air in cylinder = V = [tex]395.64 cm^3[/tex]
The volume of the air inside the cylinder is 395.64 cubic centimeters.
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What is the temperature -71 oC expressed in Kelvin?
Group of answer choices
Answer: 202.15
Explanation:
-71°C + 273.15
= 202.15K
The molar mass of silver (Ag) is 107.87 g/mol.
Calculate the mass in grams of a sample of Ag containing 1.97 x 1022 atoms.
Write your answer using three significant figures.
g Ag
Answer:
3.53 g
Explanation:
To convert from atoms to moles, you need to know Avogadro's number. Avogadro's number (6.022 × 10²³) is how many atoms there are in one mole of a substance. Use this to convert.
(1.97 × 10²² atoms) ÷ (6.022 × 10²³ atoms/mol) = 0.0327 mol
Now that you have moles, use the molar mass to convert to grams.
(0.0327 mol) × (107.87 g/mol) = 3.53 g
The mass in grams of the sample of Ag to three significant figures is 3.53 grams
The formula for calculating the number of moles of a substance is expressed as shown below:
[tex]moles =\frac{Mass}{Molar mass}[/tex]
Given the following parameters
Molar mass = 107.87 g/mol.
number of atoms of the sample = 1.97 x 1022 atoms.
Get the number of moles of the substance:
Moles = 1.97 × 10²²/6.022 × 10²³ = 0.0327 mol
Get the required mass of the substance:
Mass = moles * molar mass
Mass = 0.0327 * 107.87
Mass = 3.53 grams
Hence the mass in grams of the sample of Ag to three significant figures is 3.53 grams
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54,000,000 nanometers equals 0.000000054 megameters. true or flase
Answer:
true...
Explanation:
Convert 88.2°C into °F
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
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 volume, in mL, of carbon dioxide gas is produced at STP by the decomposition of 0.242 g calcium carbonate (the products are solid calcium oxide and carbon dioxide gas). Report your answer to 4 sig figs
Answer:
54.21 mL.
Explanation:
We'll begin by calculating the number of mole in 0.242 g calcium carbonate, CaCO3.
This is illustrated below:
Mass of CaCO3 = 0.242 g
Molar mass of CaCO3 = 40 + 12 +(16x3) = 40+ 12 + 48 = 100 g/mol
Mole of CaCO3 =?
Mole = mass /Molar mass
Mole of CaCO3 = 0.242/100
Mole of CaCO3 = 2.42×10¯³ mole.
Next, we shall write the balanced equation for the reaction. This is given below:
CaCO3 —> CaO + CO2
From the balanced equation above,
1 mole of CaCO3 decomposed to produce 1 mole CaO and 1 mole of CO2.
Next, we shall determine the number of mole of CO2 produced from the reaction.
This can be obtained as follow:
From the balanced equation above,
1 mole of CaCO3 decomposed to produce 1 mole of CO2.
Therefore,
2.42×10¯³ mole of CaCO3 will also decompose to produce 2.42×10¯³ mole of CO2.
Therefore, 2.42×10¯³ mole of CO2 were obtained from the reaction.
Finally, we shall determine volume occupied by 2.42×10¯³ mole of CO2.
This can be obtained as follow:
1 mole of CO2 occupies 22400 mL at STP.
Therefore, 2.42×10¯³ mole of CO2 will occupy = 2.42×10¯³ x 22400 = 54.21 mL
Therefore, 54.21 mL of CO2 were obtained from the reaction.
If you have a density of 15 g/mL and a mass of 5 g, what is the volume? (Don’t use fractions–change it to a decimal form)
Answer:
0.33 mL
Explanation:
Use the density formula, D = [tex]\frac{m}{v}[/tex], where m is the mass and v is the volume.
Plug in what we know and solve for v:
15 = [tex]\frac{5}{v}[/tex]
15v = 5
v = 0.33
= 0.33 mL
Answer:
d≈0.33 mL
Explanation:
Volume can be found by dividing the mass by the density.
v= m/d
The mass is 5 grams and the density is 15 grams per milliliter. Therefore,
m= 5 g
d= 15 g/mL
Substitute the values into the formula.
v= 5g / 15 g/mL
Divide 5 g by 15 g/mL. When you divide, the grams (g) in the numerator and denominator will cancel each other out.
d= 0.333333333 mL
Let's approximate our answer and round to the nearest hundredth. The 3 in the thousandth place tells us to leave the 3 in the hundredth place.
d≈ 0.33 mL
The density is approximately 0.33 milliliters.
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.