Answer:
Protons
Explanation:
The number of electrons=the number of protons
Which group/family contains elements with the smallest radius within the same period?
Answer:
Halogens
Explanation:
From the given choices, the halogens will have the smallest radius within the same period.
The size of an atom is estimated by the atomic radius. This is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state.
Across a period in the periodic table, atomic radii decrease progressively from left to right. Down a group from top to bottom, atomic radii increase progressively due to the addition of successive shells.Since halogen is the right most group from the choices given, it will have the smallest radius.
Write the full electron configuration of calcium.
152 2s22p6 352 4s2
Use the electron configuration to predict the most likely oxidation state of calcium?
(Explain your answer please)
Answer: [tex]1s^22s^22p^63s^23p^64s^2[/tex] , oxidation state = +2
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies.
The electronic configuartion of Calcium with atomic number 20 is :
[tex]Ca:20:1s^22s^22p^63s^23p^64s^2[/tex]
As calcium can easily lose its two valence electrons to attain stability , its oxidation state is +2.
[tex]Ca^{2+}:18:1s^22s^22p^63s^23p^6[/tex]
What do these words mean ?
a) filtrate
b) residue
I will give him or her brilliant and thank you
I need small and right answer.
Answer:
a) filtrate: a liquid which has passed through a filter.
Explanation:
the other one didnt pop up
how do enzymes help with digestion
Answer: Digestive enzymes play a key role in breaking down the food you eat. These proteins speed up chemical reactions that turn nutrients into substances that your digestive tract can absorb. Your saliva has digestive enzymes in it
Explanation:
What is the mass number of 199F?
Answer:
fluorine
Explanation:
hope it helps
If the size of an object decreases, volume does what?
Answer:
I'm pretty sure the volume decreases because the volume is like how much space it takes up. Sorry if im wrong.
CaCO3(s)+2H*(aq) →Ca2+ (aq)+H2001+CO262)
Initial
Initial Concentration
Experiment
Massof CaCO3(s) (grams) of Haq) (M)
1
5.00
1.0
2
5.00
2.0
Initial Temperatureof
Reactants (°C)
25.0
25.0
The initial rate of formation of CO2(e) from the chemical reaction represented by the
equation above was studied in two separate experiments. The table above provides the
experimental conditions used. If both experiments are carried out with finely powdered
samples of the solid and 50.0mL of HCl(aq), which experiment, if any, will have the faster
initial rate of formation of CO2(g) and why?
The rate of formation of CO2(g) will be the same because the mass of CaCO3(s) and the volume of
HCl(aq) used will be the same in both experiments.
CO2(g) will be formed at a faster rate in experiment 2 because more H* particles can react per
unit time.
O CO26) will be formed at a faster rate in experiment 1 because the proportion of CaCO3(s)
particles to H* particles will be greater.
The rate of formation of CO2(e) will be the same because the surface area of the solid and the
average kinetic energy of the particles will be the same in both experiments.
Answer:CO2(g) will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time
Explanation:
[tex]CO_2_{(g)}[/tex] will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time. The correct option is C.
What is a chemical reaction?A chemical reaction is a process that transforms one or more substances, known as reactants, to one or more different substances, known as products. Chemical elements or compounds are examples of substances.
Combination, decomposition, single-replacement, double-replacement, and combustion are the five basic types of chemical reactions.
Analyzing the reactants and products of a specific reaction will allow you to categorize it. Some reactions will fall into multiple categories.
If both experimental studies are carried out with finely powdered samples of the solid and 50.0mL of HCl (aq), then [tex]CO{_2_{(g)}[/tex] will be formed at a faster rate in experiment 2 because more H+ particles can react per unit time.
Thus, the correct option is C.
For more details regarding a chemical reaction, visit:
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If 250J of energy from the Sun hits the
atmosphere at a certain place, but only 128J
makes it to the surface of the Earth, how much
energy is reflected by the atmosphere?
How many molecules are contained in 78.41 L of Ne
magnesium has two naturally occurring isotopes: magnesium-24 and magnesium-25. if the average atomic mass of magnesium is 24.305 amu, what are the percent abundance's of each isotope?
a. 69.5% and 30.5%
b. 50% and 50%
c. 62% and 38%
d. 0.7% and 0.3%
e. .62% and .38%
Answer:
a. 69.5% and 30.5%
Explanation:
we know there are two naturally occurring isotopes of Mg, Mg-24 and Mg-25.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 25
1-x for isotopes having mass 24
The average atomic mass of Mg is 24.305 amu.
we will use the following equation,
25x + 24 (1-x) = 24.305
25x + 24 - 24x = 24.305
25x- 24x = 24.305 - 24
1x = 0.305
x= 0.305 /1
x= 0.305
0.305 × 100 = 30.5 %
30.5 % is abundance of Mg-25 because we solve the fraction x.
now we will calculate the abundance of Mg-24.
(1-x)
1-0.305 =0.695
0.695 × 100 = 69.5%
69.5% for Mg-24.
PLEASE HELPPPPP 12 POINTS
Answer: It most likely represents a canyon.
A solenoid is a coil of wire that produces a magnetic field when carrying an electric current. The strength of the magnetic field
produced by a solenoid can be increased in two basic ways: increasing the number of loops in the solenoid or increasing the
amount of current running through the solenoid. A solenoid's magnetic field can be increased to an even greater degree by wrapping
the wire around a material that can be magnetized. Four solenoids are shown below.
000000000000000
Solenoid A
Copper Wire Only
Current: 6 amps
Solenoid B
Copper Wire Only
Current: 8 amps
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ཤགས་
Solenoid C
Copper Wire + Iron Core
Current: 6 amps
Solenoid D
Copper Wire + Iron Core
Current: 8 amps
Based on the strength of the magnetic fields they produce, arrange the solenoids from strongest to weakest.
Solenoid A
Solenoid B
Solenoid C
Solenoid D
Answer: Motion, providing a burst of power that can move a specific part of the device.
Explanation: Hope this helps
Answer:
D > C > B> A
Explanation:
i solved this on study island
10. (a) Describe how the structure of an alloy is different to a pure metal
You can type directly into this text box below: (2)
10. (b) Suggest why coins are not made of pure copper. Do not give cost as a reason.
You can type directly into this text box below: (1)
Grade 5+ 15 marks
Total 27 marks
Um, yea, please help lol
(C)
C21H44 can be cracked to produce ethene.
Cz1H44 — 3C2H4 + C15H32
Relative formula mass (M) of C21H44 = 296
Calculate the mass of C21H44 needed to produce 50.4 kg of ethene.
Answer:
177.3kg C₂₁H₄₄
Explanation:
Based on the chemical reaction:
C₂₁H₄₄ → 3C₂H₄ + C₁₅H₃₂
Where 1 mole of C₂₁H₄₄ produce 3 moles of ethene, C₂H₄.
To solve this question we need to determine the moles of ethene in 50.4kg. 1/3 these moles are the moles of C₂₁H₄₄ that must be added:
Moles Ethene -Molar mass: 28.05g/mol-
50.4kg = 50400g * (1mol / 28.05g) = 1796.8 moles of ethene
Moles C₂₁H₄₄:
1796.8 moles of ethene * (1 mol C₂₁H₄₄ / 3 mol C₂H₄) = 589.93 moles C₂₁H₄₄
Mass C₂₁H₄₄:
589.93 moles C₂₁H₄₄ * (296g / mol) = 177283g =
177.3kg C₂₁H₄₄Rolf prepares four solutions using different solutes as shown in the table below.
Which solution is unsaturated?
Solution A
Solution B
Solution C
Solution D
Answer:
Solution A
Explanation:
Correct on Edge Cumulative Review Exam 2021
Have a blessed day
The unsaturated solution is the one where, the amount solute is lower than the solubility at a specific temperature. Hence, the solution A will form an unsaturated solution.
What is unsaturated solution?Unsaturated solutions are those having the lower concentration of solute than the saturation point of the solvent. Whereas, a saturated solution will completely dissolve the solute in its maximum amount and beyond a point the solute cannot be dissolved.
At a specific temperature gradient, if the dissolved solute is equal to the solvent's saturation point it will form a saturated solution. From the given table it is clear that except solution A all solutions have higher amount of solute than the saturation point.
As the solute concentration is higher, the solvent will try to dissolve maximum amount of the solute. Hence, in solution A have only 20 g of solute added but its saturation point is 37 g/100g. THus, the solution forms an unsaturated solution.
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Differentiate between acids and bases on the basis of their pH values. Give an example of each type. keep it simple
Answer:
differences
Any compound with a pH value between zero to seven is considered acidic, whereas a pH value between seven to fourteen is a base. An acid is called a proton donor, while a base is called a proton acceptor (Kolb, 1978).
examples are:
baking soda is basic (pH = 9.0).
Orange juice is mildly acidic (pH = approximately 3.5)
The environment in your stomach is highly acidic (pH = 1 to 2).
Explanation:
hope that helps.... thanks
12. What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
Answer:
9
Explanation:
mass number = protons + neutrons
= 4 + 5 = 9
What kind of boundary is this boundary is the site of recurring earthquake activity and faulting.
Answer:
Transform boundary
Explanation:
The boundary that is a site of recurring earthquake and faulting activities is the transform boundary.
At a transform boundary, there is a significantly high prevalence of earthquakes and faulting.
In this margin, plates slides past one another laterally along a strike - slip direction. This brings about significant shearing and crushing of rocks. It leads to series of earthquakes and faults One notable example is the San Andreas faultIf 525 N of force is applied to a 4.5
kg mass, how fast will it accelerate?
Answer:
121.11m/s²
Explanation:
Given parameters:
Force = 525N
Mass = 4.5kg
Unknown:
Acceleration = ?
Solution:
From Newton's second law of motion, we can find the solution to this problem. Using the expression below:
F = m x a
F is the force
m is the mass
a is the acceleration
So'
525 = 4.5 x acceleration
Acceleration = 121.11m/s²
help plzzzzzzzzzzzzzzz
Answer:
Blue is the metal Metals react by losing electrons from the outermost shell, which means their outermost electrons and now closer to the nucleus (one shell lower) and thus they get smaller when you go from metal atom to metal ion.
Explanation:
When KOH dissolved in ethanol, what is the intermolecular
attraction between OH ions and C2H5OH molecules?
a. Dipole-dipole
b. ionic attraction
c. London dispersion forces
d. lon-dipole
e. Covalent bonds
Answer: d. Ion-dipole
Explanation:
How does a thermometer measure temperature?
2. When an atom loses an electron, it becomes a
_a._positive ion.
c. neutral ion.
b. negative ion.
d. neutral atom.
Answer:
A
Explanation:
Atoms of elements can lose or gain electrons making them no longer neutral, they become charged. A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.
A stone weighs 105 lb in air. When submerged in water, it weighs 67.0 lb. Find the volume and specific gravity of the stone.
Which of the following pairs of compounds will react to form a precipitate? Why?
calcium chloride and silver nitrate
sodium iodide and potassium chloride
calcium chloride and sodium nitrate
Answer:
calcium chloride and silver nitrate
Explanation:
A precipitate is often formed in a double replacement reaction when the reaction yields an insoluble product.
Consider the reaction between calcium chloride and silver nitrate;
CaCl2(aq) + 2AgNO3(aq) -------->2AgCl(s) + Ca(NO3)2(aq)
AgCl is insoluble in water, hence the reaction leads to the formation of a precipitate.
What are some properties of an ice cube that tell you it is a solid? Write at least one property, and explain
how it relates to an ice cube.
Answer:
Well ice cubes are normally liquids but it is frozen water making it a solid. Since they are made of water particles, they wouldn't normally be a solid, but the particles are packed close enough together to make it one. Hope this helps! :D
Explanation:
Which kind of bond is formed when two atoms share electorons to form a molecule
Answer:
Covalent bond is formed by mutual sharing of electrons between two atoms
Explanation:
What is the Molar Mass of BaCl2?
A gold chain has a volume of 4cm3. The density of gold is 19.3 g/cm3. Calculate the mass of the gold chain. Which one is it ?
-4.8 grams
-23.3 grams
-0.21 grams
-77.2 grams
What is the answer, and please make it fast.