Answer: State of matter, Subcategory in the metal-metalloid-nonmetal trend, and electrons per shell.
Explanation:
If the specific heat of water is 4.18 3/g*^ C much heat is required to increase the temperature of 12 g of water from 23 degrees * C to 39 degrees * C ^ 2
Answer:
Q = 802.6 J
Explanation:
Given data:
Specific heat capacity of water = 4.18 J/g.°C
Mass of water = 12 g
Initial temperature = 23°C
Final temperature = 39°C
Heat required = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 39°C - 23°C
ΔT = 16 °C
Q = 12 g× 4.18 J/g.°C × 16 °C
Q = 802.6 J
What is the empirical formula for a compound that is comprised of 54.0% sodium, 8.50% boron, and 37.5% oxygen by mass?
A) Na2B2O3.
B) Na3BO3.
C) Na3B2O2.
D) Na4BO4.
Answer:
B) Na3BO3.
Explanation:
Hello!
In this case, since percent compositions are used to identify the empirical formula of an unknown compound, we can assume we have 54.0 g of sodium, 8.50 g of boron and 37.5 g of oxygen, and we compute the moles of each one:
[tex]n_{Na}=54.0g*\frac{1mol}{23g} =2.35mol\\\\n_B=8.50g*\frac{1mol}{11g}=0.773mol\\\\n_O=37.5g*\frac{1mol}{16g}=2.34mol[/tex]
Now, we divide by the moles of boron as those are the fewest:
[tex]Na:\frac{2.35}{0.773}=3\\\\B:\frac{0.773}{0.773}=1\\\\O=\frac{2.34}{0.773}=3[/tex]
Thus, the empirical formula is B) Na3BO3.
Best regards!
What do you need to know about stock solution on order to calculate a dilution?
Why is it important to know which category of microorganism has caused an infection?
Select one:
a. Treatment depends on which kind of organism caused the infection.
b. Probiotic infections can actually worsen some conditions.
c. Some infections can indicate cancer.
d. Some types of infections are highly contagious.
PLEASE ANSWER QUICKLY
Answer:
A
Explanation:
What element has the noble gas configuration [Ne]3s23p??
Answer:
Sulfur
Explanation:
The first ten electrons of the sodium atom are the inner-shell electrons and the configuration of just those ten electrons is exactly the same as the configuration of the element neon (Z = 10).
...
Noble Gas Configurations.
Element Name Sulfur
Symbol S
Atomic Number 16
Noble Gas Electron Configuration [Ne]3s23p4
What do the rows in the Periodic Table tell us?
Answer:
The rows tell you how many shells there are of the atom.
What is the total number of moles of oxygen atoms present in one mole of Mg(CIO3)2?
1. 5
2. 2
3. 3
4. 6
Answer:
Of oxygen would be 6 moles (4).
Explanation:
Since it is in a bracket you have to multiply 3 and tge 2 to get 6 oxygens.
NEED HELP ASAP!!! I just need to know the order
The percent by mass of Ca in CaCl2 is equal to
1. (40/111) x 100
2. (111/40) x 100
3. (3/1) x 100
4. (1/3) x 100
Answer:
(40/111)×100Here is a bonus Answer✍️✍️Percent composition by elementElement Symbol Mass PercentChlorine Cl 63.888%Calcium Ca 36.112Mass percentage does not have any unit as numerator and denominator contains the same unit. The percent by mass of Ca in CaCl[tex]_2[/tex] is equal to (40/111) x 100. The correct option is option A.
What is percentage by mass?Mass percentage represents the the percentage of each element that is making a particular compound.
Mathematically,
Percentage of mass = (component’s mass ÷ total mass) x 100%
Atomic weight of different element of calcium chloride{ CaCl[tex]_2[/tex]} are
Ca = 40 ; Cl = 35
Total mass of Calcium element in calcium chloride = 40g/mol
Total mass of Chlorine atom in calcium chloride = 35× 2= 71g/mol
Total molar mass of calcium phosphate = 40 +71= 111g/mole
Percentage of calcium in calcium chloride =40÷111 = 36%
Therefore, the percent by mass of Ca in CaCl2 is equal to (40/111) x 100. The correct option is option A.
To learn more about mass percentage, here:
https://brainly.com/question/27429978
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Adaleigh is learning about renewable and non-renewable resources in her science class. She decides to take
a nature walk and makes notes of all the renewable resources that she sees. Which of the following is an
observation that Adaleigh could have made on her walk?
A. The seeds on the ground are going to grow into new trees.
B. The tallest trees had the most seeds around their bases.
C. When trees decay, they could eventually turn into coal.
D. Pine trees are older than oak trees.
Answer:
A. The seeds on the ground are going to grow into new trees.
Explanation:
Trees are renewable resources.
help me pleaseeeeee
Answer:
Arthropod (3)
Annelids (2)
Cnidarians (1)
Echinoderms (4)
Explanations:
I hope all this helps if u don't understand it let me know.
i need the answer for this
Answer:
need points
Explanation:
HELPPPPPPPPP 35 POINTSSSSSS!!!!!FILL IN THE BLANKS with either "reduce" or "oxidize"
Magnesium is able to ——copper, and copper is able to —— magnesium.
Zinc is able to—— magnesium, and magnesium is able to—— zinc.
Copper is able to—— zinc, and zinc is able to—— copper.
Look at my screenshot:
Question 5
2 pts
To determine the density of an irregularly shaped object, a student immersed the object in 32.2 mL of water in a graduated cylinder, causing the level of the water to rise to 37.8 ml. If the object had a mass of 12.4 g, what is the density of the object?
O 0.32 g/mL
O 1.4 g/mL
O 3.4 g/mL
O 2.2 g/mL
Help quick right answer gets brainliest !!
Answer:
Explanation:
2.2 g/mL is the answer.
how many elements are found in the third period. A.2 B.18 C.8 D.32
Answer:
8
Explanation:
u can find it on ur chemistry book
Answer:
C. 8
Explanation:
Check chemistry textbook
The free flow of electrons is responsible for
Answer:
An electrical phenomenon is caused by flow of free electrons from one atom to another. The characteristics of current electricity are opposite to those of static electricity. Wires are made up of conductors such as copper or aluminum.
Explanation:
from google
1. What kinds of metals are REALLY reactive? why?
2. What kinds of non-metals are REALLY reactive? why?
3. What group on the periodic table doesn’t react at all? why?
Answer:
1. Alkali metals (group 1)
2. halogens (Group 17)
3. noble gasses (group 18)
Explanation:
1. alkali metals only have one valence electron meaning that they really want to lose that one valence electron to get a full octet.
2. halogens have 7 valence electrons meaning that they just need to gain 1 to get a full octet.
3. Nobel gasses already have a full octet meaning that they don't want to react. (atoms only react to get a full octet)
I hope this helps. Let me know if anything is unclear.
Why are standard electrode potentials usually measured at 1.0 M electrolyte concentration?
Answer:
To avoid variation due to concentration
Explanation:
Hope this helps :)
Rust has the same properties as iron
True
False
Answer:
false
Explanation:
According to the CDC, influenza is a respiratory illness caused by the flu virus. Some of the symptoms include cough, sore throat, muscle aches, and vomiting.
Which statement represents a reasonable claim about the effects of the flu virus on the body’s ability to maintain homeostasis?
A
Influenza affects one major system, which must work to restore homeostasis.
B
Influenza affects one system, but multiple systems must interact in order to restore homeostasis.
C
Influenza affects multiple systems and multiple systems must interact in order to restore homeostasis.
D
Influenza affects one major system and secondary systems, but the major system works to restore homeostasis.
Answer:
B. Influenza affects one system, but multiple systems must interact in order to restore homeostasis.
Explanation:
According to the CDC, influenza is a respiratory illness caused by the flu virus of which some symptoms include cough, sore throat, muscle aches, and vomiting.
The statement that represents a reasonable claim about the effects of the flu virus on the body’s ability to maintain homeostasis is that it affects one system which is the RESPIRATORY SYSTEM but multiple systems must intervene in other to maintain homeostatis.
*Homeostatis is the unique way a human body or organism stabilises its internal state despite the changes on the external.
A. What is the frequency of light that has a wavelength of 6.2 x 10^-7 m?
B. Identify the color of this light.
C. Calculate the amount of energy given off by this atom.
Answer:
I think the answer is letter C
What pH scale number represents a neutral.
What pH scale number represents a neutral.
The answer is 7
Help with this question pleasee
How many moles of O2 are needed to burn 2.56 moles of CH3OH?
Answer:
[tex]n_{O_2}=3.84molO_2[/tex]
Explanation:
Hello!
In this case, since the combustion reaction of methanol is:
[tex]CH_3OH+\frac{3}{2} O_2\rightarrow CO_2+2H_2O[/tex]
In such a way, since there is 1:3/2 mole ratio between methanol and oxygen, we can compute the moles of oxygen that are needed to burn 2.56 moles of methanol as shown below:
[tex]n_{O_2}=2.56molCH_3OH*\frac{\frac{3}{2}molO_2}{1molCH_3OH} \\\\n_{O_2}=3.84molO_2[/tex]
Best regards!
When is my dad going to get the milk?
Answer:
joe.......
Explanation:
mama......
How are ionic compounds named?
Answer:
Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions. For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.
Explanation:
Hope this helps.
Can someone help me please
is 4 Fe + 3 O2 --> 2 Fe2O3
balanced?
Answer:
Yes the given equation is balanced.
Explanation:
Chemical equation:
Fe + O₂ → Fe₂O₃
Balanced chemical equation:
4Fe + 3O₂ → 2Fe₂O₃
There are four iron and six oxygen atoms on both side of equation thus the given equation is balanced.
The given reaction also follow the law of conservation of mass.
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
This reaction is synthesis reaction:
Synthesis reaction:
It is the reaction in which two or more simple substance react to give one or more complex product.
A + B → AB
Compare and contrast the mass of the object to the size of the object.
Most of the elements in the periodic table can be described as:
A. metalloids
B. halogens
c. non-metals
D. metals
The answer would be metals :)