Answer:
soalan ni yang ni tahun atau tingkatan
Write electronic configuration of first 30 elements in their sub shell
Answer:
Helium (He) 1s2
Lithium (Li) [He] 2s1
Beryllium (Be) [He] 2s2
Boron (B) [He] 2s2 2p1
Explanation:
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A student measured the masses of some aluminum and copper cylinders of different volumes. The data is displayed below:
Aluminum: Copper:
Volume (mL)
Mass (g)
Volume (mL)
Mass (g)
3.7
9.99
1.8
16.02
6
16.2
2.3
20.47
8.5
22.99
3.5
31.15
10.74
29
4.2
37.38
15
40.5
5.8
51.62
On graph paper graph the data above on ONE graph. Use the graph paper so the longer side is your y-axis.
Use up the majority of the graph paper. Do not make a small graph!
Use a ruler/straight edge so you graph is neat.
You will need to plot the points for each substance and create a double line graph. When connecting your points for each substance, continue the lines past the plotted points.
Be sure to include a key to identify the substances.
Make your X-axis volume(mL) and your Y-axis mass(g)
Look at the numbers for both substances when creating your scales. You will most likely have a different scale for mass and volume. What is the lowest number? What is the highest number? What does it make sense to go by?
Calculate the density of each metal.
Aluminum:_________________________ Copper:________________________
What happens to the mass of the copper at the volume increases from 6 to 8mL?
Which sample is more dense? How does the graph show you this?
Answer: The data are not arranged in a useful pattern. I arranged them as best I could and made a graph in Excel for demonstration.
Explanation: The data are plotted with mass on the x axis and volume on the y. Add a key to identify the top line as CU and the bottom as Al.
The density of Cu is 8.9 g/ml and 2.70 for Al.
The mass of copper increases by 17.8 grams going from 6 to 8 ml. (8.9 g/ml)*(2 ml) = 17.8 grams.
Copper is more dense. c The graph shows that for the same volumes, copper has the higher mass.
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A procedure calls for 4 parts reagent A to 16 parts water.What is the dilution of reagent A in water?
a) 4/16
b) 1/5
c) 1/4
d) 4/12
my guess answer iss 1/4 if incorrect sorr
1/5 is the dilution of reagent A in water.
Explanation:
The dilution factor of the diluted solution is determined by dividing the final volume of the diluted solution by the volume of the undiluted solution.[tex]D.F.=\frac{V_f}{V_i}[/tex]
Where:
D.F = Dilution factor
[tex]V_f[/tex] = Final volume of the diluted solution
[tex]V_i[/tex]= Initial volume of the undiluted solution
And the dilution is represented as 1 : D.F.Given:
4 parts of the reagent and 16 parts of water are mixed together to form a diluted solution.
To find:
The dilution of reagent A in water
Solution:
Parts of reagent A =[tex]V_i = 4[/tex]
Parts of water = 16
Final volume of solution = [tex]V _f = 4 + 16 = 20[/tex]
The dilution factor of reagent A:
[tex]D.F=\frac{20}{4}=5[/tex]
The dilution of the reagent A = [tex]1:5=\frac{1}{5}[/tex]
1/5 is the dilution of reagent A in water
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Detection of nitrongen ??
Answer:
The extract is boiled with FeSO4 and acidified with concentrated H2SO4. The appearance on Prussian blue colour indicates the presence of nitrogen
Explanation:
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Which statement correctly compares the number of protons and electrons in atom of rubidium (Rb) and Calcium (Ca)?
The question is incomplete, the complete question is;
Which statement correctly compares the number of protons and electrons in atoms of rubidium (Rb) and calcium (Ca)?
Rubidium has fewer protons and fewer electrons than calcium.
Rubidium has fewer protons and more electrons than calcium.
Rubidium has more protons and fewer electrons than calcium.
Rubidium has more protons and more electrons than calcium.
Rubidium has 37 electrons and protons as well as 48 neutrons. Calcium has 20 electrons, protons and neutrons.
Rubidium is a group 1 element while calcium is a group 2 element. Rubidium has more protons and more electrons than calcium.
Rubidium is an element in group one of the periodic table. It has 37 electrons and protons as well as 48 neutrons.
Calcium is an element in group two of the periodic table. It has Calcium has 20 electrons, protons and neutrons.
From the foregoing, we can see that Rubidium has more protons and more electrons than calcium hence the answer.
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The strength of van der Waals forces increases as:
A. molecular size decreases
B. molecular size increases
C. number of electrons increases
D. number of electrons decreases
Answer:
B and C
Explanation:
is it multiple choice question??
Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.
What are Van der Waals force?
Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.
An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.
The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.
Therefore, the size and the electron increase the Van der Waals force.
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A study of reaction _______ is called chemical ________ .
Answer:
The study of reaction "Rates" is called Chemical "Kinetics.
3. What of the following determines an atom's identity?
A. Protons
B. Neutrons
C. Electrons
D. Nucleus
Answer:
protons
Explanation:
the number of protons in a nucleus are equal to the number of atoms in an element.
Protons determines an atom's identity. Therefore, the correct option is option A among alt the options.
Three essential elements make up an atom: protons, neutrons, and electrons. The nucleus, or central portion of the atom, contains protons, which are positively charged particles. Along with protons, neutrons, which have no charge, are found in the nucleus. On the other hand, electrons are negatively charged particles that move in regions called energy levels or shells around the nucleus. An atom's atomic number and designation as an element are determined by the quantity of protons in it. The usual size of an atom is between 0.1 and 0.5 nanometers; one nanometer is equal to one billionth of a metre.
Therefore, the correct option is option A.
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4. Which of the following are not able to
travel through empty space?
A. gamma rays
C. sound waves
B. ultraviolet waves
D. light waves
Answer:
C.Sound waves.
Hope it helps you.How many moles of hydrogen are produced when 6.28 mol of oxygen form?
Answer:
3.14 is the answer
Explanation:
hope it may help you
A scientist is working in a lab and accidentally combines two liquids that quickly form a solution. Which process could be used to
separate the two liquids? (1 point)
heating the liquids and letting one boil away first
passing the liquids through a filter to collect one of them
collecting one of the liquids with a spoon
waiting for the two liquids to separate
Answer:
Heating the liquids and letting one boil away first :)
Explanation:
Heating the liquids and letting one boil away first will be used to separate the two liquids.
Two liquids that quickly form a solution when combined are called miscible liquids.To Separate them, The best decision from the option is to heat the liquids and let one boil away first.
This is a separating method or techniqe called Distillation where two miscible liquids example water and ethanol are separated by Distillation due to the difference in boiling point. The liquid with the lower boiling point boils first and evaporates or trapped in another tube flask while the other with higher boiling point remains .
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what happens to the food dye in hot water?
Answer:
The food coloring mixes through the hot water faster than it mixes with the cold water. The reason for this is because in hot water, the water molecules have more energy and are moving faster than the molecules of cold water. This makes it way more easier for the dye to get mixed throughout the hot water.
Explanation:
What are the missing coefficients for the chemical equation
[ ] Ca + [ ] O2 → [ ] CaO
Answer:
[tex]{ \sf{[ 2] Ca_{(s)} + [1 ] O_{2(g)} → [ 2] CaO _{(s)}}}[/tex]
difference between Ammonia and ammonium..
plz do not scam
4.250 x 10-6 nm in standard form , please help!!
Answer: 4,250 x 10 - 6
Explanation: ok so we have a decimal number, what you do with that is
[tex]4.250 x 10^{3}[/tex] = 4.250 x 1,000 = 4,250 now you can just move the decimal every time without that equation but its better safe. I'm pretty sure that's how they want it, because its not expanded or word.
this is for anyone who’s good with science coz I absolutely hate it. ILL BRAINLIST U AND GIVE U 5 STAR TO WHOEVER IS GOOD;) be specific and use ur own words please! thankyou. and good luck LOL.
conclusions:
The burning candle is an example of a combustion reaction.
a) What do all combustion reactions require?
b) What do all combustion reactions produce?
c) Write a general word equation for the combustion reaction.
Answer:
A) Oxygen
B) Heat
C)
Explanation:
Hope it helps
Answer:
a) oxygen is nessasary for all combustion to occur
b)carbon dioxide and water
c)for example combustion of methane:
CH4+2O2 -------> CO2+H2OA scientist who wants to study the effects of a new fertilizer on plants would probably
Answer:
1 no is answer give each experiment group the same amount of fertilizer
Give an example of a non-biological chemical reaction that involves carbon. Name the process that converts a solid compound into a gas.
Answer: The combustion of methane (CH4) with O2.
Explanation: This is a chemical reaction involving carbon:
CH4 + 2O2 = CO2 + 2H2O
grass → rabbit → fox
Explain why energy is lost by the rabbits in the middle step of this food chain.
Answer:
It is used by the organism itself for respiration.
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1) Burning toast physical or chemical
2) Cooking eggs: physical or chemical
3) Melting butter: physical or chemical
4) Removing the pulp (solid) from the orange juice using a juice strainer.: physical or chemical
5) Cutting the toast with a knife: physical or chemical
6) Digesting the food: physical or chemical
A cup of hot tea cools down
a
Chemical Change
b
Physical Change
Answer:
Physical change
Explanation:
No new substances were produced so it is physical change.
Answer:
Physical Change
Explanation:
Since only the temperature is changing not the structure of tea its a physical change. Good luck ;)
PLEASE HELP!!
___ are the most organized state of matter
a.) Solids
b.) liquids
c.) gases
Answer:
solids
Explanation:
liquids spill away and gases are well,,,gases
An element has an atomic number of 16. An ion of this element has a 2- charge. How is the ion formed?
Answer: Atomic number 16 is sulfur (S). It has 6 valence electrons and needs two more to complete it's outer shell to 8 electrons. It will steal those electrons from elements theat need to lose electrons to achieve a full valence shell (lower energy shell).
Explanation: Sulfur's valence shell is 3s^2_3p^4. It needs two more electrons to fill the 3p orbital to 6 electrons. This is a lower energy state and so sulfur will remove, or share, electrrons from elements that benefit from losing an electron to achieve a lower energy state.
How is energy stored in a Van der Graaf generator?
A. Energy is stored in the nucleus
B. Energy is not stored
C. Energy is stored in the chemical bonds
D. Energy is stored in an electrical field
Answer:
C
Explanation:
A Van de Graaff generator is an electrostatic generator which uses a moving belt to accumulate electric charge on a hollow metal globe on the top of an insulated column, creating very high electric potentials. It produces very high voltage direct current (DC) electricity at low current levels
1. Based on the Law of Conservation of Mass, if
100g of sodium metal reacts with 25g of
chlorine gas, what will be the total mass of the
product, sodium chloride, created in the
chemical reaction?
2 Na Cl2
2NaCl
100gm + 25gm
+
?
[tex]\boxed{\sf {Na\atop Sodium}+{Cl\atop Chlorine}\longrightarrow {NaCl\atop Sodium Chloride}}[/tex]
Na=100gCl=25g.Mass of reactants :-[tex]\\ \sf\longmapsto Na+Cl[/tex]
[tex]\\ \sf\longmapsto 100+25[/tex]
[tex]\\ \sf\longmapsto 125g[/tex]
Mass of NaCl=125g
What is the control in the experiment?
Answer:
C. the amount of drug x given to mice
When Hydrogen and Oxygen
form a molecule, what happens to their neutrons?
A. They share their neutrons:
B. They both lose neutrons.
C. Nothing happens to their neutrons.
. Arrange the following in order of increasing radius:
a) Mg2+, Na+, Al3+
b) Na+, Al3+ , Mg2+
c) Mg2+ , Al3+ , Na+
d) Al3+ , Mg2+, Na+
guys pls help i will venmo you money
Answer:
Al3+<Mg2+<Na+
Explanation:
this is because of nuclear charge (no. of protons)
atomic radius is inversely proportional to nuclear charge.
The metal zirconium becomes superconducting at temperatures below 3.4000K.
Calculate the temperature at which zirconium becomes superconducting in degrees Celsius. Be sure your answer has the correct number of significant digits.
Answer:
-269.75 degrees Celsius
Explanation:
question : what are isotopes
Answer:
Isotopes are versions of the same element. They have the same number of protons and electrons as the element but different mass numbers and number of neutrons.
Explanation:
one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table.