which element has chemical properties that are most similar to potassium?
a. calcium
b. cesium
c. nitrogen
d. sulfur
Answer:
CESIUM
Explanation:
Potassium is one of the alkali metals. The alkali metals are the elements that make up Group 1 (IA) of the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. The alkali metals also include lithium, sodium, rubidium, cesium, and francium.
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The element which contains similar chemical properties as of Potassium would be:
B). Cesium
'Potassium' is described as the element that is 'soft and waxy in appearance' with the symbol K and atomic number 19 and "Cesium' is also soft in nature and it possesses a goldy finish.
The similarity between the chemical properties of 'Potassium' and 'Cesium' include:
Both are the components of the group of alkali metals. Both of them are highly responsive metals. 'Potassium' and 'Cesium,' both are soft in texture.Thus, option B is the correct answer.
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A pharmacist mixed some 10%-saline solution with some 15%-saline solution obtain 100 mL of a 12%-saline solution. How much of the 10-saline solution did the pharmacist use in the mixture
Answer:
10%-saline solution = 60mL
15%-saline solution = 40mL
Explanation:
Let
10%-saline solution = x
15%-saline solution = y
x + y = 100
0.1x + 0.15y = 100*0.12
x + y = 100 (1)
0.1x + 0.15y = 12 (2)
from (1)
x = 100 - y
Substitute x = 100 - y into
0.1x + 0.15y = 12
0.1(100 - y) + 0.15y = 12
10 - 0.1y + 0.15y = 12
- 0.1y + 0.15y = 12 - 10
0.05y = 2
y = 2 / 0.05
y = 40mL
Substitute y = 40 into
x + y = 100
x + 40 = 100
x = 100 - 40
x = 60mL
10%-saline solution = 60mL
15%-saline solution = 40mL
When force are ____ the object does not move
when forces are balanced the object does not move.
Explanation:
if you and your friend push both sides of the chair at the same time with the same amount of strength the chair wouldn't move.
Helium (He), neon (Ne) and argon (Ar) are all colorless, odorless gases with low chemical reactivity. Based on the periodic table, which other element would also have those same properties?
Answer:
Given above are noble gases and other noble gases would be xenon, radon, oganesson, krypton.
hope it helps!
Answer: A
Explanation: just did it
Which of the following would be the best soil for gardening?
A )A soil that is 35 percent sand, 30 percent clay, and 35 percent silt
B) A soil that is 10 percent sand, 80 percent clay, and 10 percent silt
C) A soil that is 5 percent sand, 20 percent clay, and 75 percent silt
D) A soil that is 85 percent sand, 10 percent clay, and 5 percent silt
Answer:
C
Explanation:
Silt is very benifical for plant growth. So the one with the most silt would be the best for gardening soil.
Answer: C
Explanation:
Which of the following is not an advantage of asexual reproduction?
A. Quick
B. only involves one parent
C. genetic sameness
D. genetic variation
Answer:
a
Explanation:
Hint: The half life of an element is the amount of time it takes for half of that element sample to decay into a different
element
Based on the graph of radioactive decay for Co-60, how many years does it take for a 10 gram sample of Co-60 to decay into a 125
gram sample?
-0.)
A)
3 years
B)
5.27 years
15.8 years
D)
3 half lives
^ $* ENG
Answer:
Concept: Half-life
Just a general tip, learn to format your question and fix any grammatical issues. Post the question as a picture instead next time, because the copy and pasting clearly failed for you. I'm assuming you mean 1.25 grams.So it would take 3 yearsA gas has a volume of 1400 milliliters at a temperature of 20 K and a pressure of 760 mm Hg. What will be the
volume when the temperature is changed to 40 K and the pressure is changed to 380 mm Hg?
A. 350 mL
B. 750 mL
c. 1400 ml
D. 5600 mL
Answer: 1400 mL
Explanation:
The change in volume with change in pressure and change in temperature can be calculated using combination of gas laws. Here, the change in volume is 5600 ml.
What is combined gas laws?Boyle's law, Charles's law and Gay- Lussacs law all relating the temperature, pressure and volume of an ideal gas. The relation between these three parameters from the combination of these laws at conditions is written as:
P1 V1/T1 = P2 V2/ T2.
From this, the change in volume V2 can be calculated.
Given , P1 = 760 mmHg
T1 = 20 k and V1 = 1400 mL.
T2 = 40 k and P2 = 380 mmHg.
The new volume V2 = P1 V1 T2 / T1 P2.
= (760 mmHg × 1400 ml × 40K) / (20 K × 380 mmHg)
= 5600 mL.
Therefore, the change in volume of the gas is 5600 ml.
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Differentiate between acids and bases on the basis of their pH values.
Answer:
acid; there ph value is mostly 7
base: there ph value can be more than 7 or less than 7
Answer:
The more towards 0 a pH value is, the increasingly acidic. Conversely, the more towards 14 a pH value is, the increasingly alkaline. Some examples of bases are lye, ammonia, and seawater. Some examples of acids are vinegar, lemon juice, and battery acid. To determine the pH of a liquid, you can use pH strips. Depending on the color (the redder the more acidic, the bluer the more alkaline), you can determine the pH of whatever you are trying to measure.
If a parent cell has 24 chromosomes , how many chromosomes will each daughter cell have? Then compare the chromosomes in the parent cell and the daughter cells.
Answer:
If a cell has 24 chromosomes before cell division then daughter cell resulting from mitotic division will have 24 chromosomes while daughter cell resulting from the meiotic division will contain 12 chromosomes each.
Explanation:
A local plant nursery uses large sprinklers to water the plants twice a day. The water contains phosphorus, which is a fertilizer that helps plants grow. Some of the water becomes runoff and ends up in nearby streams and lakes. This is an example of which type of short-term human-induced environmental change? eutrophication
Answer:
It’s eutrophication
Explanation:
There is no way it can be DEFORESTATION or NON SUSTAINABLE SPECIES
Non sustainable harvesting has something to do with animals and eutrophication means adding excessive nutrients
Answer:A.
Explanation: I took the test, sorry if this is incorrect
Gregor Mendel studied the traits of pea plants. Because of his contributions, he is known as the Father of?
Answer:
A monk, Mendel discovered the basic principles of heredity through experiments in his monastery's garden. His experiments showed that the inheritance of certain traits in pea plants follows particular patterns, subsequently becoming the foundation of modern genetics and leading to the study of heredity.
Explanation:
Answer:
Gregor Mendel (July 20, 1822 - January 6, 1884), is known as the Father of Genetics, is most well-known for his work with breeding and cultivating pea plants, using them to gather data about dominant and recessive genes.
Explanation:
You asked, I answered.
Hope this helped! :)
Use the periodic to fill in the numbers in the electron configurations shown below.
B: 1s2 2sA2pB
A =
2
B =
1
Na: 1s22sC2pD3sE
Answer:
B: 1s²2s²2p¹
Na: 1s²2s²2p⁶3s¹
Explanation:
A = 2
B = 1
C = 2
D = 6
E = 1
Hope that helps.
Answer:
B: 1s2 2sA2pB
A = 2
B = 1
Na: 1s22sC2pD3sE
C = 2
D = 6
E = 1
A 12.4 mL solution of sulfuric acid is completely neutralized by 19.8 mL of 0.0100M calcium hydroxide.
What is the concentration of the sulfuric acid solution?
Answer:
It's the number after what I mean is like its 12.4 mL right now skip ahead its 13.5 mL
Explanation:
I tried pls dont be mad I spent 3 hrs on this :((
what is the net force of 2N 1N 4N?please
Answer: 7N
Explanation:
Help needed: Which of the following is the correct name for N2S5?
A. Dinitrogen sulfide
B. Dinitride pentasulfur
C. Dinitrogen pentasulfide
D. Nitrogen sulfide
Answer:
dinitrogen pentasulfide
Explanation:
The correct name for the compound N₂S₅ is Dinitrogen pentasulfide and the correct option is option C.
Naming of compounds refers to the systematic process of assigning names to chemical compounds based on their composition and structure. It involves following certain rules and conventions to generate appropriate names that accurately represent the chemical formula and characteristics of the compound.
In inorganic chemistry, naming compounds often involves identifying the elements present and specifying their respective oxidation states or charges. Various naming conventions, such as the Stock system and the common system, are used depending on the type of compound and the specific elements involved.
Thus, the ideal selection is option C.
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how long does it take to drive a distance of 260 miles at a speed of 65 mph?
Answer:
4 hours
Explanation:
Chemical Equations :p
Explanation:
4NH₃ (g) + 5O₂ (g) → 4NO (g) + 6H₂O (g) Ba(ClO₃)₂ (s) → BaCl₂ (s) + 3O₂ (g) 2Al (s) + 3Zn(NO₃)₂ (aq.) → 3Zn (s) + 2Al(NO₃)₃ (aq.) 2C₈H₁₈ (g) + 25O₂ (g) → 16CO₂ (g) + 18H₂O (g)Explain why the temperature of distilled water is kept at 37°C ?
Answer:
the temperature of distilled water is kept at 37 because it needs to kill off some microbes.
what is the octet rule?
Answer:
the octet rule is a chemical rule of thumb that reflects the observation that main group elements and bonds and such a way that each has a electrons in its valence shell giving the same electronic configuration as noble gas
3. Hydrogen reacts with nitrogen to produce ammonia according to the equation:
3H2(g) + N2(g) 2NH3(g)
Determine how much ammonia would be produced if 100g of N2 reacts?
Mass of ammonia produced : 121.38 g
Further explanationGiven
Reaction
3H₂(g) + N₂(g) ⇒ 2NH₃(g)
100g of N₂
Required
Ammonia produced
Solution
mol of N₂ :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{100}{28}\\\\mol=3.57[/tex]
From the equation, mol ratio of N₂ and NH₃ = 1 : 2, so mol NH₃ :
[tex]\tt \dfrac{2}{1}\times 3.57=7.14~moles[/tex]
mass of NH₃(MW=17 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=7.14\times 17\\\\mass=121.38~g[/tex]
Label each state of matter occurring in the photographs, and label the arrows to indicate the addition or removal of thermal energy
Answer: The first one would be a frozen thing like ice since the molecules are so packed, the next would be like this inside of a basketball or car tires, they move around freely(solid), and the last would be a gas since they aren't so many left(gas)
Explanation:
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the states are solid, liquid and gases.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. Degree of Celsius is used to measure temperature which has nothing to do with matter.
Therefore, the states are solid, liquid and gases.
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Complete the chart below for a patient that has diabetes. Use the words
Low, Normal, High, and None.
Body Part and System
Test Results
Mouth (digestive system)
Starch:
Oxygen:
Glucose:
Small intestine (digestive system)starch:
Oxygen
Glucose:
Lungs (respiratory system)
Starch:
Oxygen:
Glucose:
Cells
Starch:
Oxygen:
Glucose:
Answer:
It picked out for the best time for man to the earth for the earth and the earth in the moon to moon earth earth moon earth and moon earth moon and moon earth lord earth moon earth lord moon earth moon and earth moon earth lord lord moon earth moon lord moon earth lord moon lord
Explanation:
Aluminum nitrate reacts with sodium hydroxide to form a precipitate of aluminum hydroxide. What mass of aluminum hydroxide will precipitate when 35.5 mL of 0.145 mol/L aqueous aluminum nitrate is mixed with 44.2 mL of 0.215 mol/L aqueous sodium hydroxide?
Answer:
The mass of aluminum hydroxide that will precipitate when 35.5 mL of 0.145 mol/L aqueous aluminum nitrate is mixed with 44.2 mL of 0.215 mol/L aqueous sodium hydroxide is approximately 0.247 grams
Explanation:
The given parameters are;
The volume of 0.145 mol/L aqueous aluminum nitrate in the reaction = 35.5 mL
The volume of 0.215 mol/L aqueous sodium hydroxide in the reaction = 44.2 mL
The balanced chemical equation for the reaction is given as follows;
Al(NO₃)₃ (aq) + 3NaOH (aq) → Al(OH)₃ (s) + 3NaNO₃ (aq)
Therefore;
1 mole of Al(NO₃)₃, reacts with 3 moles of NaOH to form 1 mole Al(OH)₃, and 3 moles of NaNO₃
The number of moles of aqueous aluminum nitrate in the reaction = 35.5/1000 L × 0.145 mol/L = 0.0051475 moles
The number of moles of aqueous sodium hydroxide in the reaction = 44.2/1000 L × 0.215 mol/L = 0.009503 moles
Therefore, 0.009503 moles NaOH will react with 0.009503/3 moles Al(NO₃)₃ to form 0.009503/3 moles of aluminum hydroxide precipitate
The molar mass of aluminum hydroxide = 78 g/mol
Therefore, 0.009503/3 moles of aluminum hydroxide weighs 78 × 0.009503/3 = 0.247078 grams
The mass of aluminum hydroxide that will precipitate out ≈ 0.247 grams.
Calculate the number of atoms in 2.8 moles of silicon atoms
Answer:
1.686 × 10²⁴ atomsExplanation:
The number of silicon atoms can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 2.8 × 6.02 × 10²³
We have the final answer as
1.686 × 10²⁴ silicon atomsHope this helps you
What are the main functions of the human skeletal system?
A To support the body, protect the organs, produce blood cells, and store calcium.
To regulate the composition of body fluids by removing metabolic wastes and retaining a balance of water, salt, and other
nutrients
OcTo regulate and maintain bodily functions by producing hormones and releasing them into the bloodstream.
D. To enable the diffusion of oxygen into the bloodstream and the removal of carbon dioxide from the bloodstream.
Answer:
The answer is A.........
Answer:
It´s letter A
Explanation:
Calculate: The molecular mass of a molecule is the sum of the masses of each atom in the molecule. The
unit of molecular mass is the universal mass unit (u).
Iron's atomic mass is 55.85 u, carbon's mass is 12.01 u, and oxygen's mass is 16.00 u.
Calculate the molecular mass of carbon dioxide (CO2)
Answer:
44.01
Explanation:
12.01 + 16.00 + 16.00 = 44.01
What is the value for AG at 100 Kif AH = 27 kJ/mol and AS = 0.09 kJ/(mol-K)?
A. AG = 2700 kJ/mol
B. AG = -36 kJ/mol
C. AG = 0 kJ/mol
D. AG = 18 kJ/mol
Answer:
ΔG = 18KJ/mol
Explanation:
Given data:
ΔG = ?
ΔS = 0.09 Kj/mol.K
ΔH = 27 KJ/mol
Temperature = 100 K
Solution:
Formula:
ΔG = ΔH - TΔS
ΔS = entropy
ΔH = enthalpy
by putting values,
ΔG = 27 KJ/mol - 100K(0.09 Kj/mol.K)
ΔG = 27 KJ/mol - 9 KJ/mol
ΔG = 18KJ/mol
How many electrons are in the third energy level?
A. 2
B. 8
C. 18
D. 20
Answer:
C. 18
Explanation:
its b(8)
Explanation:
the third energy level can actually hold up to 18 electrons but it's not filled when it has 8 electrons
Which substance is a homogeneous mixture? (3 points)
Cereal
Silver
Nickel
Shampoo
Answer:
Shampoo
Explanation:
Its a homo mixture because if you look at the way it is mixed you will
know it is a homogeneous mixture