why does the d block start in the fourth row of the periodic table
Answer:
Why does D-block start on the fourth row of the periodic table?
Explanation:
The require more energy to reach 3d than 4s, and they fill up 4p before 4d, and so forth. ... The energy is lower for 6s than 4f, and 4f and 5f are lower in energy than the final D level.
The movement of broken down pieces of rock from one place to another is called
A. Deposition
B. Erosion
C. Weathering
D. Sediment
Answer:
The answer I believe is B. Erosion
Explanation:
Just sounds better than all the other choices.
Answer:
erosion b
Explanation:
it breaks down the rocks i remembered this in 4th grade :)
Something that is made out of natural resources for human use is called
Answer: Man Made Resources?
Explanation: Its when humans create their own things.
What is the purpose of the periodic table?
Answer:
the periodic table is important because it is organized to provide a alot of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.
Explanation:
4. How much water would be needed to dilute at 750 ml solution of 2.8M HCl to a 1.0 M solution?
5. If 550 mL of a 3.50 M KCl solution is left out to evaporate until the volume is 275 mL, what would the
new Molarity be?
6. Extra Credit: A solution of H,SO, has a molarity of 0.14 mol/L in 750 mL. If 250 mL of water is added:
a. What is the new molarity of the solution?
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Question 5
Which of the following is not an example of mutualism?
The total pressure of a mixture of hydrogen, oxygen, and methane is 96.4 kPa. The partial pressures of hydrogen and oxygen are 13.5
kPa and 29.3 kPa respectively. What is the partial pressure of methane?
A. 139.2 kPa
B. 53.6 kPa
C. 82.9 kPa
D. 42.8 kPa
Answer:
53.7kPa
Explanation:
Given parameters:
Total pressure of the mixture = 96.4kPa
partial pressure of hydrogen = 13.4kPa
partial pressure of oxygen = 29.3kPa
Unknown:
partial pressure of methane = ?
Solution:
The total pressure of mixture is equal to the sum of their particles pressures;
Partial pressure of methane = 96.4kPa - (13.4kPa + 29.3kPa)
Partial pressure of methane = 53.7kPa
Answer: 53.6
Explanation: I just took the test and got it right.
Substance X is extremely acidic. Substance Y is extremely basic. What would be formed if substance X and Y were mixed together?
Answer:
salt will form bcz when acids reacts with base then it forms salts . and this reaction is called neutralization reaction
How many atoms are in 4.3 moles of lithium?
please help asap 10 & 11
Answer:
false
Explanation:
because if one of the p-protein of one is less then then the eyecolor will be different
Based on what you know, which element would you predict would most likely form an anion?
A. iron
B. tin
C. calcium
D. chlorine
Answer:chlorine
Explanation:
Anions are ions of non metals and the only non mental in that list is chlorine (group 7)
18. What is the molarity of a bleach solution containing 9.5 g of NaOCL per liter of bleach
Answer:
0,1276 M
Explanation:
Molair mass of NaOCl = 74,44 g/mol
You have 9,5 g/L.
You need to calculate with the molair mass, how many moles 9,5 g are:
9,5 g / 74,44 g/mol = 0,1276 mol
0,1276 mol / 1 L = 0,1276 M
The molarity of a bleach solution containing 9.5 g of NaOCL per liter of bleach is mathematically given as
M= 0.1276 M
What is the molarity of a bleach solution containing 9.5 g of NaOCL per liter of bleach?Generally, the equation for the Molar mass is mathematically given as
M=m/(g/mol)
Therefore
M=9,5 g / 74,44 g/mol
M= 0,1276 mol
Hence
M= 0.1276 M
In conclusion, the molarity
M= 0.1276 M
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Write the balanced equation for : potassium chlorite decomposing to potassium chloride and oxygen . (use —> for the arrow)
Answer: 2 KCIO3(s) + heat —> KCI (s) + 3 O2(g)
Explanation:
Will these groups of elements form ionic or molecular compounds? sodium and Iodine 
Answer:
Ionic
Explanation:
Answer:
carbon and hydrogen are molecular
Explanation:
Solve the equation.
3 - y = 13
y =
Answer:
First we isolate y by doing - 3
-y = 10
Explanation:
-10 since 3- (-10) is actually 3 + 10 which is 13
Scientists often need a catalyst to start a chemical reaction. They need to apply heat, acids, or other materials to jump-start the experiment.
Which phrase is the best definition of catalyst?
A. something hot
b. something acidic
c. something that triggers
d.something that is scientific
Answer:
something that triggers
Explanation:
a catalyst helps move a reaction along
A catalyst shows some specificity in its action. It speeds up only a spontaneous reaction. The best definition of catalyst is something that triggers. The correct option is C.
What is a catalyst?A substance which increases the rate of a chemical reaction without itself undergoing any permanent change chemically or quantitatively is defined as the catalyst and the phenomenon is called catalysis.
It is believed that a catalyst actually participates in the chemical reaction that is speeds up. It forms temporary bonds with the reactants yielding an intermediate activated complex.
A typical example of catalyst is iron (Fe) which is used in the Haber process for the manufacture of ammonia. The catalyst is recovered unchanged in amount and chemical composition at the end of the reaction.
In most cases, a small amount of a catalyst can speed up reaction between large amounts of reactants. A catalyst shows maximum efficiency at optimum temperature.
Thus the correct option is C.
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The door to the classroom weighs 3 kg. How much work is done when Michael pushes on
the door to the classroom with 15 Newtons of force, pushing the door 1.3 meters?
Work done : 19.5 J
Further explanationGiven
F = 15 N
d = 1.3 m
m = 3 kg
Required
Work done
Solution
Work is the product of force with the displacement of objects.
Can be formulated
W = F x d
W = Work, J, Nm
F = Force, N
d = distance, m
Input the value :
W = 15 N x 1.3 m
W = 19.5 J
the mass has no effect on this problem
One mole of silver has a mass of 107.9 grams. Approximately how many atoms of silver are present in one mole of silver?
A) 107 atoms
B) 108 atoms
C) 6 × 1023 atoms
D) 53 × 1023 atoms
Answer C) 6 × 1023 atom
The number of silver atoms present in one mole of silver is 6.0 × 10²³ atoms. The correct option is C) 6 × 1023 atoms
StoichiometryFrom the question, we are to determine the number of silver atoms present in one mole of silver.
From the formula,
Number of atoms = Number of moles × Avogadro's constant
Number of atoms = 1 × 6.022 × 10²³
Number of atoms = 6.022 × 10²³
Number of atoms ≅ 6.0 × 10²³ atoms
Hence, the number of silver atoms present in one mole of silver is 6.0 × 10²³ atoms. The correct option is C) 6 × 1023 atoms
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Select all the correct answers.
Which of these are examples of mixing and separating?
removing seed casings from grains
a soda bottle bubbling when it is opened
a bright copper statue turning green from weathering
removing salt from seawater
water decomposing to oxygen and hydrogen
Answer:
Removing seed casings: separatingSoda bottle bubbling when opened: mixing as before it was opened nothing was happening but as it came in contact with atmosphere it started to bubble.
Bright copper statue turning green from weathering: mixing as all vapors and gases in atmosphere combined with copper of that statue they started to change color of statue
Removing salt from seawater: obviously removing as one component Water decomposing: obviously separating as it's constituent elements are removed from compound and converted into individual elements
How many moles of solute are in 250 mL of 2.0 M CaCl2? How many grams of CaCl2 is
this?
Answer:The solution contains 0.50 mol or 55 g of CaCl2 . You know there are 2.0 mol of CaCl2 in 1 L of solution. (40.08 + 2 × 35.45) g=(40.08 + 70.90)
g=110.98 g
Explanation:
My I please have brainliest
110.98 grams of CaCl₂ is there present in 2.0 M CaC₂.
What is calcium chloride?Calcium chloride is made up of calcium and chloride.
Given, that the solution contain 250 mL of 2.0 M CaCl2
You know there are 2.0 mol of CaCl2 in 1 L of solution.
(40.08 + 2 × 35.45) g
= (40.08 + 70.90)
=110.98 g
Thus, 110.98 grams of CaCl₂ is there present in 2.0 M CaC₂.
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Write the formula: carbon hexabromide
Answer: C2Br6
Explanation:
What is the sequence of coefficients that will balance the following decomposition reaction of dihydrogen monosulfide? H₂S ----> H₂ + S₈
8 S
In this case you must start balancing the sulfur to have 8 on each side of the reaction. So:
Answer:
Explanation:
The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.
The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.
Then, taking into account all of the above, you can determine the amount of elements on each side of the equation:
Left side: 2 H and 1 S
Right side: 2 H and 8 S
In this case you must start balancing the sulfur to have 8 on each side of the reaction. So:
8 H₂S → H₂ + S₈
Now the amount of elements on each side of the equation:
Left side: 16 H and 8
Right side: 2 H and 8 S
Now you need to start balancing the hydrogen to get the same amount from each side of the reaction. So:
8 H₂S → 8 H₂ + S₈
Now the amount of elements on each side of the equation:
Left side: 16 H and 8
Right side: 16 H and 8 S
The balanced reaction is:
8 H₂S → 8 H₂ + S₈
This coffee pot has a temperature of 23 degrees. The coffee cup was put in the microwave and is now 45 degrees. Which one has a greater thermal energy?
Answer:
. Which one has a greater thermal energy?
the coffee cup
Which type of model is a way of imagining how something works?
Answer:
mental model is an explanation of someone's thought process about how something works in the real world. It is a representation of the surrounding world, the relationships between its various parts and a person's intuitive perception about his or her own acts and their consequences. Mental models can help shape behaviour and set an approach to solving problems (similar to a personal algorithm) and doing tasks.
:)
HELPPPPPPPPPPP HELPPPPP HELP
Answer:
calcium chloride and water
Explanation:
the reaction absorbed energy which means endothermic
1. Ammonia gas occupies a volume of 450. ml at a pressure of 720, mm Hg. What
volume will it occupy at standard pressure?
Answer:
720+450 = 1170 it's 1170
426.32mL (rounded)
The formula for finding V2 is P1 • V1/P2 and since standard pressure (1atm) is equal to 760 P2 would be 760.
720mmHg • (450mL/760mmHg) = 426.32mL
Why is it that the decomposition of nitroglycerin can result in so
much more volume than the decomposition of sodium azide?
Answer:
with the molecular formula C3H5(ONO2)3, has a high nitrogen content (18.5 percent) and contains sufficient oxygen atoms to oxidize the carbon and hydrogen atoms while nitrogen is being liberated, so that it is one of the most powerful explosives known.
Explanation:
NTG reduces preload via venous dilation, and achieves modest afterload reduction via arterial dilation. These effects result in decreased myocardial oxygen demand. In addition, NTG induces coronary vasodilation, thereby increasing oxygen delivery.
The decomposition of nitroglycerin can result in so much more volume than the decomposition of sodium azide nitroglycerin contains a lot of nitrogen (18.5%) and has enough oxygen atoms.
What is volume?A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, like the cubic metre or litre, or different imperial or US-standard units, including the gallon, quart and cubic inch. Volume and length (cubed) have a symbiotic relationship.
The total volume much a container is usually thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the quantity of fluid (liquid or gas) that the container may hold. The decomposition of nitroglycerin can result in so much more volume than the decomposition of sodium azide nitroglycerin contains a lot of nitrogen (18.5%) and has enough oxygen atoms for the nitrogen to be liberated while also oxidising the hydrogen and carbon atoms.
Therefore, the decomposition of nitroglycerin can result in so much more volume than the decomposition of sodium azide nitroglycerin contains a lot of nitrogen (18.5%) and has enough oxygen atoms.
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I need help with number 5 pleaseee
Answer: the answer is d
Explanation:
Decane + Dioxygen = Carbon Dioxide + Water
Reaction Type
Combustion
Calculate the [H⁺] if the [OH⁻] is 1.0 × 10⁻⁵ M.
Answer:
ithink it is 9.0
Explanation:
Do liquids have kinetic energy? Yes or no.
Answer:
YESSIR
Explanation:
