Answer:
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Explanation:
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How long will it take you to walk 12 km if your speed is 2.5 km/hr?
Explanation: Walking for 30 minutes covers a distance of 2.0 to 2.5 km and burns about 125 calories
Answer:
4.8 hours
Explanation:
12÷2.5= 4.8 hours
why elements are arranged according to atomic number rather than atomic mass in the periodic table
What is the name of a number with a fixed value in a specific mathematical context?
⚪︎inverse
⚪︎direct
⚪︎variable
⚪︎constant
⚪︎invariable
Answer:
constant
Explanation:
A constant is a number with a fixed value in a specific mathematical context
Answer: The answer is C
Explanation: And coordinate them with a rectangle or square tiles to provide constant.
Which option gives an object's volume in SI units
The SI unit of volume is the cubic meter.
Conduction is when heat is transferred through
A. the sun
B. the air
C. the object
D. the motion
What is the percentage of chlorine in NaCl?
Answer:
60.66 %
Explanation:
The mass percentage of chlorine is 60.66 % chlorine in the compound sodium chloride. To calculate this, add together the mass of one mole of sodium
Write two ways to reduce carbon dioxide in atmosphere which result to global warming.
Answer:
1- Using buses rather than opting for cars.
2- Regularly servicing your cars.
Explanation:
Alkali metals are extremely reactive because they
1. have very small atomic masses
2. are not solid at room temperature
3. have one valence electron that is easily removed to form a positive ion
4. have two valence electrons that form compounds with calcium and magnesium
Answer:
1 is the answer of these questions
Alkali metals are extremely reactive because they 3. have one valence electron that is easily removed to form a positive ion
Why are alkali metals so reactive ?The alkali metals are the elements in group 1 of the periodic table. They are lithium, sodium, potassium, rubidium, cesium, and francium. These elements are all very reactive because they have one valence electron that is easily removed to form a positive ion.
The valence electron is the electron that is furthest away from the nucleus of the atom. It is also the electron that is involved in chemical bonding. The alkali metals have a very low ionization energy, which means that it does not take much energy to remove the valence electron.
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what is the state of matter shown in this figure?
Which power source directs the electrons from oxidation-reduction reactions to flow through a device to give the device power? O A. An electric motor B. A battery C. An electromagnet O D. An electric generator
Answer:
B. A battery.
Explanation:
I just took the test
If I wanna swing where would the kinetic energy be highest and lowest
Determine the fraction of an original sample of tritium that remains unchanged after 24.62 years.
Answer: The answer is 1/4
Explanation:
Therefore, the fraction of an original sample of tritium that remains unchanged after 24.62 years will be 1/4.
What is fraction?
A fraction denotes a portion of something larger or, more broadly, any quantity of equal pieces.
Calculation of fraction
Given data:
t = 24.62 years = 25 years.
T = 12.5 years
Fraction can be calculated by using the formula:
N / [tex]N_{0}[/tex] = (1/2) power n..................(i)
n = t / T,......(ii)
Put the value of t and T in fraction equation.
n = 25 / 12.5
n = approx = 2.
Now, using equation (ii).
N / [tex]N_{0}[/tex] = (1/2) power 2
N / [tex]N_{0}[/tex] = 1/4.
Therefore, the fraction of an original sample of tritium that remains unchanged after 24.62 years will be 1/4.
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Why would a scientist want to replicate another scientist's experiment?
Answer:
See the answer below
Explanation:
A scientist B might want to replicate the experiment of another scientist A in order to assess the claims made by scientist A. In other words, replication of the experiment of another scientist is done to see if a similar outcome would be arrived at or there would be variations.
The claims made by a scientist while reporting the outcome of a particular experiment must be reproducible by another scientist under similar conditions. Otherwise, the claims are said to be false.
PLEASE HELP THIS IS OVER DUE AND I NEED TO GET IT DONE IM REALLY BAD AT CHEMISTRY
In which state of matter (Solid, liquid, or a gas) do atoms/particles move the fastest?
Answer:
GasExplanation:
I hope it helps ❤❤❤.......
Answer:
Gas
Explanation:
Solid= Particles are really tight (Example: Ice Cube) Has a fixed shape
Liquid= Particles flow freely but is of constant volume.(Liquid fills it's container. Example: Water) No fixed shape
Gas= Particles move freely can fill its container has NO FIXED SHAPE or NO FIXED VOLUME(Example: Oxygen) Particels move FASTEST
please help. thank you!
Find an interesting chemical reaction. It can be a simple one but please have some facts and info about it. Thank you!
Answer:
Mercury chemical bond with aluminum, AKA aluminum amalgam
Explanation:
After the protective oxide layer on aluminum is broken, if mercury were to come into contact with it, then the aluminum will bond with the mercury and will create this interesting tower looking thing upwards. You can learn more about this by searching up Aluminium amalgam, where there is plenty of info about it.
Manganese(IV) sulfate
O Mn(SO4)2
O MnSO4
O MgSO4
DONE
Answer:
A
Explanation:
What is the purpose of light energy?
The element in Group 4, Period 3 of the periodic table is classified as a
Answer:
if you mean group 4a then it is a metalliod
Explanation:
In which reaction is a small molecule formed from the atoms removed from a single reactant molecule?
Explanation:
During condensation reaction, two molecules combine to form a single molecule with the loss of a small molecule; in dehydration reaction, this lost molecule is water.
The reaction is a small molecule formed from the atoms removed from a single reactant molecule this reaction is knowing as condensation reaction.
How is the condensation process?Essentially, this is the reverse process of vaporization. In order for water vapor to undergo the process of condensation, which is the change from a gaseous state to a liquid state, it is necessary for a reduction in its temperature to occur until it reaches the dew point or an increase in the pressure to which it is subjected.
In this case the condensation reaction are when two molecules combine to form a single molecule with the loss of a small molecule, in dehydration reaction, this lost molecule is water.
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A collection of standards that define proper social behavior in a specific community is called
confidentiality.
etiquette.
teamwork.
self-discipline.
hello
WRITE CAUSES AND CONSEQUENCE OF ANY 2 NATURAL CALAMITIES.
Answer:
1) eathquake
earthquake is the natural calamities where there is the vertical and horizontal shaking of the
earth crust. it is cause due to overlappibg of the different plates that are present in the earth surface. when this plates intersect or expand the earth occurs
consequences are it causes loss of life and human property , degards the environment , it leads to flood, landslides etc The damage caused by earthquakes is from ground shaking, ground rupture, landslides, tsunamis, and liquefaction.
Next - volcanic eruption
its is the out flow of the larva from the inner of the earth to other surface. it is cayse due to high pressure exerted on the surface of the earth that leads to explode the inner larva.
its consequences are it degards the environment and loss of the beauty of the nature , there is loss of human life , widlife , etc. volcanic eruption include infectious disease, respiratory illness, burns, injuries from falls, and vehicle accidents related to the slippery, hazy conditions caused by ash. When warnings are heeded, the chances of adverse health effects from a volcanic eruption are very low.
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Answer:
B hotplate beakers thermometers
Explanation:
Answer:yea im going to go with A
Explanation:
what is a metal and a non metal
Answer:
I assume you mean as in elements
A metal "A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically malleable or ductile." (wiki)
a non-metal "In chemistry, a nonmetal is a chemical element that mostly lacks the characteristics of a metal. Physically, a nonmetal tends to have a relatively low melting point, boiling point, and density. A nonmetal is typically brittle when solid and usually has poor thermal conductivity and electrical conductivity." (wiki)
Explanation:
Answer:
On the periodic table, the metals are usually on the left and middle side and nonmetals on the right side. nonmetals tend to be either a liquid or gas at room temperature and metals are usually solids at room temperature.
Explanation:
Water has a density of 1g/cm3. Describe an investigation that could test whether a material has a density less than, greater than, or equal to water and identify the independent and dependent variable in your investigation. Also, identify your hypothesis.
Answer:
You can test whether or not the object is more or less dense than what by having, “80mL” (as long as the amount of water is easy to read and doesn’t overflow). You take all the object you want to test for, slowly and carefully drop the object into the water. If the Object sinks it is more dese and if it floats it is less dense. To find the exact density of the tested objects look at how much water is being displaced in the container and subtract the amount of water from that to get volume. Then, (or before putting the object into water) weight the object to find its mass. Next you divide the mass in mL by the volume to get the exact density.
Explanation:
pleaze help im gonna fail this semester
hydrogen peroxide mixed with vinegar makes wich deadly gas?
when hydrogen peroxide mixed with vinegar makes peracetic which is potentially toxic and irritate skin, eyes and respiratory system.
Given the unbalanced equation showing the reactants and product of a reaction occurring at 298 K and 100. kPa:
____P4(s) + ____Cl2(g) ____PCl3(l) + energy
Balance the equation below for the reaction, using the smallest whole number coefficients.
____P4(s) + ____Cl2(g) ____PCl3(l) + energy
Balanced equation
P4(s) +6Cl2(g) ⇒4PCl3(l) + energy
Further explanationGiven
Reaction(unbalnced)
P4(s) +Cl2(g) ⇒PCl3(l) + energy
Required
Balanced equation
Solution
Give a coefficientaP4(s) +bCl2(g) ⇒PCl3(l) + energy
Make an equationP, left=4a, right=1⇒4a=1⇒a=1/4
Cl, left=2b, right=3⇒2b=3⇒b=3/2
The equation becomes:
1/4P4(s) +3/2Cl2(g) ⇒PCl3(l) + energy x 4
P4(s) +6Cl2(g) ⇒4PCl3(l) + energy
why do people save money in bank
Explanation:people save money in the bank because there is no fear of theft and robbery ans also we can get interest from the bank which is profit for us.
Answer:
People save money in bank to save robbery from the people .
How many grams do you have in: 5.3 moles of Zr(NO3)4
Answer:
1800 g Zr(NO₃)₄
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
5.3 mol Zr(NO₃)₄
Step 2: Identify Conversions
Molar Mass of Zr - 91.22 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Zr(NO₃)₄ - 91.22 + 4(14.01) + 12(16.00) = 338.26 g/mol
Step 3: Convert
[tex]5.3 \ mol \ Zr(NO_3)_4(\frac{339.26 \ g\ Zr(NO_3)_4}{1 \ mol \ Zr(NO_3)_4} )[/tex] = 1798.08 g Zr(NO₃)₄
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
1798.08 g Zr(NO₃)₄ ≈ 1800 g Zr(NO₃)₄
_______ is a physical property
A: Oxidation
B: Flammability
C: Density
D: Combustibility
Answer:
C. Density
all the others are chemical properties
Answer:
C: Density
Explanation:
Burning of paper is chemical change why? write with reaction.
Answer:
Burning of paper is not a physical change.It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process!