Answer:
dimensional analysis is the way of converting different units. when you add two physical quantities or equate them they must be in same units.
uses:
to check the correctness of a physical formula
to convert the value from the one system to another.
to form a relationship between different physical quantities
Question 6
6. Ozone protects living organisms from damaging UVB rays.
True
False
Answer:
True
Explanation:
Ozone protects living organisms from damaging UVB rays
Answer:
A: True
Explanation:
The ozone layer acts as an invisible shield and protects us from harmful ultraviolet (UV) radiation from the sun.
The current day periodic table is organized by
Answer:
Dmitri Mendeleev
Explanation:
Dmitri Mendeleev published the first recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table. Most of his forecasts proved to be correct
Answer:
Mendeleev periodic table
Explanation:
In 1869, just five years after John Newlands put forward his
Law of Octaves, a Russian chemist called Dmitri Mendeleev
published a periodic table. Mendeleev also arranged the
elements known at the time in order of relative atomic mass
The braking distance of the car represents which variable?
A-dependent
B-independent
C-control
Answer:
b
Explanation: i did the quiz
Answer:
Explanation:i’m not sure.
A sample of iron has the dimensions of 2 cm x 3 cm x 2 cm. If the mass of this
rectangular-shaped object is 94 g, what is the density of iron?
Answer: Volume iron = 2 x 3 x 2 => 12 cm³
Mass = 94 g
D = m / V
D = 94 / 12
D = 7.833 g/cm³
Explanation:
is solar energy ecosystem services if so why
yes
Explanation
it is using the sun energy as an energy resource and is therefore Eco friendly
Hope this answer correct :)
what is 98.723 m= cm
Explanation:
To change from m to cm, divide by 100
[tex] \frac{98.723}{100} \\ = \: 0.98723cm[/tex]
Fill in the SI unit for each of the following measurements. 1: Time: ___ 2. Length:___ 3. Mass:___ 4. Temperature___
the si unit for time is second
the si unir for length is meter
the si unit for mass is kilogram
the si unit for temperature is kelvin
1: Time: second 2. Length: meter 3. Mass: kilogram 4. Temperature kelvin are the SI units of measurements.
What do you mean by SI unit of measurements?
It is unit of the standard of reference which is chosen to measure any type of physical quantity.
SI Units of Measurements is the system which stands for the international system of unit.
The SI, uses standard symbols, units and abbreviations, developed by the Bureau International.
The SI unit of mass is the kilogram, length is a meter, time is second, temperature is kelvin, electric current is ampere, amount of substance is mole, luminous intensity is candela.
SI unit has a huge amount of application universally in both technical and scientific research to avoid the confusion.
This system is important as it helps the entire world to understand the measurements in one set of unit systems.
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What evidence do you see that a chemical reaction is taking place when you add hydrogen peroxide to potassium ioxide??
Answer:
Bubbling/Foaming
Heat is produced
Explanation:
A chemical reaction has occurred if
1. There is a change in colour
2. Formation of a precipitate
3. Formation of a gas
4. Change in temperature
5. Change of smell
In the reaction of hydrogen peroxide and potassium iodide, the solution quickly rises which shows the formation of gas. This means it is a chemical reaction.
The beaker/test tube/whatever you used should also become warm because it is an exothermic reaction. This means its a chemical reaction
Identify the terms described by selecting the correct word from the drop-down menu.
Anything that has mass and takes up space
The part of Earth in which life exists, including land, water, and air
Answer: Matter
Biosphere
Explanation:
The substance that occupies space and mass is called matter, and the biosphere is the part of the earth that includes life. Thus, the correct options are 1. c and 2. b.
What is the matter?A matter has been defined as a substance that is made of atoms and has a mass that results in it occupying some space. The matter can be in the form of liquid, solids, or gas. The matter is present everywhere and can be interconnected. Thus, 1. c is correct.
The biosphere is defined as the sphere that combinedly comprises the hydrosphere, lithosphere, and atmosphere and is the part where life exists on the earth. It includes the elements air, water, land, etc., and all the ecosystems that range from oceans to mountains. Thus, 2. b is correct.
Therefore, options 1. c. matter and 2. b. the biosphere is correct.
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Your question is incomplete, but most probably your full question was,
1. Anything that has mass and takes up space
AtomElementMatter2. The part of the earth in which life exists including land water and air
ThermosphereBiosphereExosphereA scientist wants to find the percent of teens that like the taste of "brand X" lemonade over "brand Y" lemonade. She conducts a taste test of 500 teenagers. She gives each teen a bottle of lemonade with the labels showing the brand of each lemonade. She asks each teenager to taste each brand after drinking water in between. She finds that 50% of teens like brand X and 50% like brand Y lemonade. Why are the results of the survey most likely unreliable?
Answer:
She gave them bottles with labels showing the brands
Explanation:
the teens could have been biased due to knowing the brand. It would have been more reliable if the label was covered or removed.
Is atomic mass and molar mass same?
Answer:
Atomic mass is the mass of an atom and is given in a.m.u. (atomic mass unit).
Explanation:
Atomic mass is the mass of an atom and is given in a.m.u. (atomic mass unit). However, a molar mass is the mass of one mole atoms or molecules and is given in grams. Sodium atom has a mass of 23 a.m.u. however, the molar mass of sodium is 23g/mol.
Why do our hair become grey?
Answer:
As humans, we have melanin in our hair but as we grow the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle become a more transparent color. Our hair goes through its natural cycle of dying and regenerating, it’s more likely to grow in as gray after the age of 35. Stress can sometimes speed it up
Explanation:
Answer:
As we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin and will become a more transparent color — like gray, silver, or white — as it grows.
Balance the following equations: i) KClO3 KCl + O2 ii) HNO3 + NaHCO3 NaNO3 + H2O + CO2 iii) Na + H2O NaOH + H2
i) 2KClO3 → 2KCL + 3O2
ii) HNO3 + NaHCO3 → H20 + CO2
iii) 2Na + 2H2O → 2NaOH + H2
I need help please help me
chemical potential energy, thermal energy, electrical energy, sound energy
Explanation:
the coal is chemical potential energy because it is just sitting there, the coal fueled power plant is thermal energy because it is using the heat from the coal to work the power plant, that is then turned into electrical energy, which then goes to the radio which displays sound energy
pls give brainliestThe force that develops when two solutions, each with a different concentration of solutes, are separated by a semipermeable membrane is:________
a. systolic pressure
b. diastolic pressure
c. osmotic pressure
d. atmospheric pressure
Answer:
The correct answer is option c, that is, osmotic pressure.
Explanation:
The development of the force, which takes place when two solutions exhibiting distinct solute concentrations are distinguished by a semipermeable membrane is known as osmotic pressure. It is the least pressure that is required to be imparted to a solution to inhibit the inward pure solvent flow through a semipermeable membrane.
The flow of solvent molecules via a semipermeable membrane to a region of high solute concentration from a region of low solute concentration, until attainment of equilibrium, is done is termed as osmosis.
Select the correct answer. Which quantity is a graduated cylinder designed for measuring? A. length B. mass C. temperature D. time E. volume
what is the Newton's second law?explain.
5) How many kilograms are in 185.6 lbs?
Answer:
84.1 Kilograms
Explanation:
A guy swam a 50 meter freestyle in 21.93 seconds. How fast is this in miles per hour?
Answer:
Speed = 5.107 mile/hrExplanation:
Given:distance =50m = 0.0311 mile
Time= 21.93 seconds/3600 =0.00609 hour
Speed=?
Speed= Distance / Time = 0.0311 / 0.00609 = 5.107 mile/hrIf A • B*2 = 1.8 x 10*-7, and C•B/D = 7.2 x 10*-4, find the value of A•D*2/C*2
Answer:
A*D²/C² = 0.347
Explanation:
A*B² = 1.8*10⁻⁷----- (1)
making A subject of formula; A = 1.8 * 10⁻⁷/B² ----(2)
C* B/D = 7.2*10⁻⁴ ----(3)
making C subject of formula; C = D * 7.2*10⁻⁴/B ----(4)
substituting the values of A and C in the equation A*D²/C²
A*D²/C² = (D² * 1.8 * 10⁻⁷/B²)/(D * 7.2*10⁻⁴/B)²
A*D²/C² = (D² * 1.8 * 10⁻⁷/B²)/(D² * 5.184*10⁻⁷/B²)
A*D²/C² = D² * 1.8 * 10⁻⁷/B² * B²/D² * 5.184*10⁻⁷
A*D²/C² = 1.8 * 10⁻⁷/5.184*10⁻⁷
A*D²/C² = 0.347
Which of the following is displaced by 'Cu'? 1.Fe2+ 2.Ag+ 3.Zn2+ 4.Al3+
Answer:
2.Ag+Explanation:
This problem tests our knowledge/understanding of the electro-chemical series.
Electrochemical series or activity series is a list that describes the arrangement of elements in order of their increasing electrode potential values.
In the electro-chemical series metals placed above can displace metals below from their salt solutions.
In this question given the series as stated
1. Fe2+
2.Ag+
3.Zn2+
4.Al3+
In the series we have metals stated as Zn>Fe>Cu>Ag.
Cu will displace silver Ag+ because it is below it in the series
What is a change of a substance from one form to another without changing its composition called? (1 point) A. Atomic Change B. Chemical Change C. Molecular Change D. Physical Change
Answer:
D. Physical Change
What letter on the graph corresponds to only liquid water
Answer:
What letter on the graph corresponds to both liquid water and steam? D
Explanation:
Liquid water exists between 0 and IOO degrees Celcius.
A weightlifter can lift 495 lbs. How many kg is that? Please provide a step-by-step procedure.
Answer:
Explanation:
2.2 pounds = 1 kg
495 pounds = x
2.2/495 = 1/x Cross multiply
2.2*x = 495 * 1 Divide by 2.2
2.2x/2.2 = 495/2.2
x = 225 kg
A solid object is 75.5 g in mass and has a volume of 13.25 cm^3. What is its density?
5,7 g/cm³
Explanation:d = m/V
= 75.5g/13.25cm³
≈ 5,7 g/cm³
What do you think plasma looks like on the molecular level?
Answer:
At the molecular level, the plasma only lets us see ions and electrons released.
Explanation:
Plasma is the fourth state of matter.
A state similar to gas, but with the difference that it does not have an electromagnetic equilibrium. It also has no defined mass or volume unless it is placed in a closed container.
Water in solid-state: A mesh style is seen where its components obtain more attraction force.
But on the other hand, in the plasma something well defined is not seen, since due to the high temperature its molecules give off electrons, leaving only ions and electrons around.
Japanese scientists accidentally invented a way for ice cream to not melt by the power of polyphenols from strawberries. I want to know: Can eating too much ice cream that contains polyphenols kill you? Is it safe to eat too much?
Answer:
Japanese is educated place so they invent those things which are really good and helpful...
in my opinion it is safe....
chloride gas is usually collected by downward delivery after preparation because chlorine gas is
A. soluble in water
B. denser than water
c. less dense than air
d. very reactive
what is five plus forty five
Answer:
5+ 45 = 50 is the answer....
Answer:
55. I hope this helps you!
Answer in the correct significant figures: 19.117 - 8.110
Answer:
11.007
Explanation:
that is the answer