Answer:
0.03943946590515751
Explanation:
Answer:
0.03944 mol HCl
Explanation:
Step 1: Define
Molar Mass of H - 1.01 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of HCl - 36.46 g/mol
Step 2: Use Dimensional Analysis
[tex]1.438 \hspace{3} g \hspace{3} HCl(\frac{1 \hspace{3} mol \hspace{3} HCl}{36.46 \hspace{3} g \hspace{3} HCl} )[/tex] = 0.03944 mol HCl
In your own words describe a chemical change and physical change.
Why isn't the atomic mass of most of the elements on the Periodic Table an integer (not a decimal)?
Answer:
Atomic mass is never an integer number for several reasons
Most of an atom consists of empty space. Its mass is concentrated in its center, which is called the
nucleus. The nucleus consists of protons and neutrons. (The ordinary hydrogen atom is an
exception; it contains one proton but no neutrons.) Protons carry a positive electrical charge, while
neutrons carry no electrical charge. Circling the nucleus is a cloud of negatively charged electrons.
Answer:
Most of an atom consists of empty space. Its mass is concentrated in its center, which is called the nucleus. The nucleus consists of protons and neutrons.
Explanation:
The only thing Keith Rodriguez controls in his hot air balloon is altitude. How does he control the balloons altitude?
Which element has 4 energy levels and 2 valence electrons?
Answer:
Beryllium
Explanation:
The element that has 4 energy levels and 2 valence electrons is Beryllium.
What is a Beryllium?Beryllium is a chemical element that comes in the second row and is an alkaline earth metal.
It is silvery-white, and very brittle at room temperature.
Its properties are similar to aluminum.
It has two valence electrons in the k shell and two in L shell.
Thus, the correct element is Beryllium.
Learn more about Beryllium
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How many sig. figs. are in the following numbers?
1) -16
5) 10,000
2) 5.000 x 1011
6) 2060
3) 0.009090
7) 3.50 x 10-5
4) 4,010
8) 80.011
9) 97.0
10) 0.0010
11) 46.074
12) 0.6
Answer:
1. 2
2. 1
3. 1
4. 3
5. 3
6. 2
7. 3
8. 1
9. 2
10. 1
11. 3
12. 1
Explanation:
There are 3 main significant figure rules, I suggest looking them up online to confirm these answers
Ions bonds are strong?
True or False
Answer:
Ture
Explanation:
Answer:
true
Explanation:
ions bond are those bonds which are made with the exchange of electrons between metals and nonmetals.Thus they are very strong.
Colin is visiting his grandparents at the beach. While walking on the beach, 17
he notices the tide pools that are left behind when the ocean recedes.
Which of the following explains the cause of tides?
i have a few question please help its due in a few hours
1. Determine the specific heat of a certain metal if a 450 gram sample of it loses 34,500J of heat as its temperature drops by 97K
2. The temperature of a 25 gram sample of a certain metal drops by 103 K as it loses 2600 joules of heat. What is the specific heat of the metal?
3.What is the final temperature after 840 Joules is absorbed by 10.0g of water at 298K?
(please show steps)
Answer:
1 = c = 0.79 j/g.K
2= c = 1 j/g.K
3 = T2 = 123.1 K
Explanation:
Given data:
Specific heat of metal = ?
Mass of metal = 450 g
Heat loses = 34,500 j
Temperature drop = ΔT = 97 K
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
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
34500 j = 450 g ×c × 97 K
34500 j = 43650 g.K ×c
c = 34500 j/43650 g.K
c = 0.79 j/g.K
2)
Given data:
Specific heat of metal = ?
Mass of metal = 25 g
Heat loses = 2600 j
Temperature drop = ΔT = 103 K
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
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
2600 j = 25 g ×c × 103 K
2600 j = 2575 g.K ×c
c = 2600 j/2575 g.K
c = 1 j/g.K
3)
Given data:
Mass of water = 10 g
Heat absorbed = 840 j
Initial temperature drop = 298 K
Final temperature = ?
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 = T2 - T1
840 j = 10 g ×4.18 j/g.K × [T2 - 103 K]
840 j = 41.8 J/K × [T2 - 103 K]
840 J/41.8 J/ K = T2 - 103 K
20.1 k = T2 - 103 K
T2 = 20.1 K + 103 K
T2 = 123.1 K
How many valence electrons will atoms in group 16 of the periodic table have?
Answer:
6 valence electrons
Explanation:
Can someone help me please
Answer:
Strange question. All the answers are D
Explanation:
I don't exactly know how you should answer this. I can find the charge on Chromium. The only hope is that they are all the same.
[Cr(OH)_-6]^-3
x - 6 = -3 Add 6
x = -3 + 6
x = 3
======
CrO4 ^-2
x - 4*2 = - 2 add 8
x = -2 + 8
x = 6
================
Water has no effect on the charge. The chromium has a charge of +2
One example of a chemical change is
is this correct im so confused.
Answer:
the last option!!!!
Explanation:
because its right
Which of these most directly affects what happens to white light when it hits an object?
the properties of the object
the source of the light
the speed at which the light travels
the distance of the object from the light
Answer:
the answer is a is got it right on engdenuity
Explanation:
The fact that most directly affects what happens to white light when it hits an object is the properties of the object.
What is white light?White lighte is that light which conatins all the colors of the vissible spectrum in it.
As a result, the behavior of white light is determined by the qualities of the thing it strikes. When white light strikes an item and all of the light wavelengths are reflected, we see a white color. And if we are able to see any color of an object then because of the fact that given object will reflect only that color and absorb other all.
Hence the properties of the object directly affects the effect of white light.
To know more about white light, visit the below link:
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#SPJ2
11.Name the elements in period 4 that are no metals
Answer:
(Se) Selenium
(Se) is an element in group 16. Selenium is the first nonmetal in period 4.
what is the metal that is grouped with metalloids
Answer:
The post-transition metals cluster to the lower left of this line. Metalloids: The metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po). They form the staircase that represents the gradual transition from metals to nonmetals.
Explanation: i googled it
The metal that is grouped with metalloids are
boron, silicon, germanium,arsenic, antimony, and tellurium.A metalloid is a type of element which possesses the characteristics of both the metals and the non-metals.
Metals are those elements that are good conductors of heat and electricity while non-metals are those elements that neither conducts heat nor electricity.
The characteristics of the metalloids listed above are:
They conduct heat only at higher temperatures. The metalloids that can conduct electricity are called semi-conductors.They are shiny like metals but brittle like non-metals.Therefore, since these elements share both the properties of metals and non-metals, they are called the metalloids.
Learn more here:
https://brainly.com/question/6499600
what is the mass number of an element with an atomic number 10 and 10 neutrons
Answer:
Neon
Explanation:
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how many molecules are contained in 0.254 moles of diarsenic trioxide
Answer:
1.53 × 10²³ molecules As₂O₃
Explanation:
Step 1: Define
Diarsenic Trioxide - As₂O₃
Avagadro's number: 6.02 × 10²³ atoms, molecules, formula units, etc.
Step 2: Use Dimensional Analysis
[tex]0.254 \hspace{3} mol \hspace{3} As_2O_3(\frac{6.02(10)^{23} \hspace{3} molecules \hspace{3} As_2O_3}{1 \hspace{3} mol \hspace{3} As_2O_3} )[/tex] = 1.52908 × 10²³ molecules As₂O₃
Step 3: Simplify
We have 3 sig figs.
1.52908 × 10²³ molecules As₂O₃ ≈ 1.53 × 10²³ molecules As₂O₃
The density of an object is .835 g/cm3. If its volume is 34 cm3, what is the mass of the object? (Density: D = m/v)
Answer:
The answer is 28.39 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 0.835 × 34
We have the final answer as
28.39 gHope this helps you
Determine the number of atoms in the following chemical formula: Ba(OH)2
Answer:
5
Explanation:
Ba,1 O,2 H,2
the somes are 5
Which of the following is NOT a unit energy? (select all that applies)
Kelvin
Kelvin
calories
calories
Celsius
Celsius
Fahrenheit
Fahrenheit
joules
Answer:
Kelvin, Celsius, Fahrenheit
Explanation:
See my other answer for an explanation.
Joules, Kelvin and Calories
What do we mean when we say a chemical reaction is balanced? (Several choices can be correct.)
There is an equal number of solids, liquids, and gases on both sides of the reaction arrow.
There is an equal number of products on the right side of the equation as there are reactants on the left side of the
arrow.
The total number of each atom is the same on both sides of the reaction arrow.
The net charge on both sides of the reaction arrow is the same.
Answer:
2 and 3
Explanation:
A chemical reaction is defined as the process in which two or more reactants combined together chemically and gives a different product.
A balanced chemical equation involves an equal number of atoms on the reactant and product side. A balanced chemical reaction occurs when the atoms present on the reactant side or left side of the arrow is equal to the atoms on the product side or right side of the arrow.
The process of the balanced chemical equation is based on errors and trials in which the atoms in each element is identified, the atoms are then multiplied with required numbers, the addition of coefficient in front of molecules and check the equation at last.
Hence, the correct options are "2 and 3".
1. The radius of a Cl nucleus is 4.0 fm, and the radius of a Cl atom is 100 pm. (1
fm = 1x 10-15 m; 1 pm = 1 x 10-12 m).How many times larger is the diameter
of the Chlorine atom than the diameter of the Chlorine nucleus?
Answer:
The diameter of the Chlorine atom is 25000 times larger than the diameter of the Chlorine nucleus.
Explanation:
From the question,
The radius of a Cl nucleus is 4.0 fm and radius of a Cl atom is 100 pm.
To determine how many times larger the diameter of the Chlorine atom is than the diameter of the Chlorine nucleus,
First, we will determine the diameter of the Chlorine atom and the diameter of the Chlorine nucleus.
(NOTE: Diameter = Radius × 2)
For the Chlorine atom
Radius of the Chlorine atom = 100 pm
∴ Diameter of the Chlorine atom = 2 × 100 pm
Diameter of the Chlorine atom = 200 pm
For the Chlorine nucleus
Radius of Chlorine nucleus = 4.0 fm
∴ Diameter of the Chlorine nucleus= 2 × 4.0 fm
Diameter of the Chlorine nucleus = 8.0 fm
Now, we will convert both diameters ( diameter of Chlorine atom and diameter of Chlorine nucleus) to the same unit
For Chlorine nucleus
Diameter of the Chlorine nucleus = 8.0 fm
If 1 fm = 1 × 10⁻¹⁵ m
Then, diameter of the Chlorine nucleus = 8.0 × 1 × 10⁻¹⁵ m
Diameter of the Chlorine nucleus = 8.0 × 10⁻¹⁵ m
For Chlorine atom
Diameter of the Chlorine atom = 200 pm
If 1 pm = 1 × 10⁻¹² m
Then, diameter of the Chlorine atom = 200 × 1 × 10⁻¹² m
Diameter of the Chlorine atom = 200 × 10⁻¹² m
Diameter of the Chlorine atom = 2 × 10⁻¹⁰ m
Now, to determine how many times larger the diameter of the Chlorine atom is than the diameter of the Chlorine nucleus, we will divide the diameter of the Chlorine atom by the diameter of Chlorine nucleus.
Diameter of Cl atom / Diameter of Cl nucleus = (2 × 10⁻¹⁰ m) / (8.0 × 10⁻¹⁵ m)
(2 × 10⁻¹⁰ m) / (8.0 × 10⁻¹⁵ m) = 25000
∴ Diameter of Cl atom / Diameter of Cl nucleus = 25000
Hence, the diameter of the Chlorine atom is 25000 times larger than the diameter of the Chlorine nucleus.
The diameter of the Cl atom has been 25,000 times larger than the diameter of the Cl nucleus.
To calculate the relationship between the diameter of Cl atom and nucleus, the diameter has to be calculated.
Diameter = 2 [tex]\times[/tex] radius
Diameter of Cl atom:
Cl atom = 2 [tex]\times[/tex] 100 pm
Cl atom = 200pm
1 pm = [tex]\rm 10^-^1^2[/tex] m
200 pm = 200 [tex]\times[/tex] [tex]\rm 10^-^1^2[/tex] m
Diameter of Cl nucleus:
Cl nucleus = 2 [tex]\times[/tex] 4 fm
Cl nucleus = 8 fm
1 fm = [tex]\rm 10^-^1^5[/tex] m
8 fm = 8 [tex]\times[/tex] [tex]\rm 10^-^1^5[/tex] m.
The relationship between the Cl atom and the nucleus has been made by taking the ratio of the diameter of the Cl atom to the Cl nucleus.
[tex]\rm \dfrac{Diameter\;of\;Cl\;atom}{Diameter\;of\;Cl\;nuclues}\;=\;\dfrac{200\;\times\;10^-^1^2}{8\;\times\;10^-^1^5}[/tex]
Diameter of Cl atom = 25000 Diameter of Cl nucleus.
Thus, the diameter of Cl atom has been 25,000 times larger than the diameter of the Cl nucleus.
For more information about the Cl atom, refer to the link:
https://brainly.com/question/18119646
How many total atoms in the compound Al3NO2
Answer:
1 mole of aluminum must contain 6.022⋅1023 atoms of aluminium → this is known as Avogadro's constant.
Explanation:
Answer:
[tex]6.02 \times {10}^{23} \: atoms[/tex]
Explanation:
since every compound is equivalent to one mole of particles. This number is represented by avagadros constant which represents the atomic proportion from molar to physical mass on a human scale. This equates to the amount of particles per mole of substance(amount of substance).
[tex]6.02 \times {10}^{23} \: {mol}^{ - 1} [/tex]
this can be denoted in symbol form by
[tex]N_A[/tex]
avagadros constant is defined as rational so the exact value is 6.02214076×10^23.
avagadros number : 1 mole
radio stations broadcast signals on two different frequency bands these are called _____ and ____
Answer: AM and FM frequency
Explanation:
The atmospheric pressure on a mountain is 500 mmHg and 1 atm is equal to 760 mmHg. What is the pressure in atm?
Answer:
≈ 0.6579 atm
Explanation:
The pressure in atmospheres is the ratio of the pressure on the mountain to one atmosphere, in corresponding units.
The pressure is ...
500 /760 atm = 25/38 atm ≈ 0.6579 atm
5. (04.03 LC)
Which of the following steps can be used to identify an acid-base reaction
Check if one element replaces another element in a compound.
Check if the ions of two compounds exchange places.
O Check whether the reactants are an acid and a base.
Check whether the products are an acid and a base.
Plz help
Answer: Check whether the reactants are an acid and a base.
Explanation:
The step to determine the acid-base reaction, it has been checked that where there has been an acid or base in the reactants or not. Thus, option C is correct.
The acid base reaction can be described as the chemical reaction involving the exchange of hydrogen ions in between the reactant species.
The acid base reaction has been mediated in the system where there has been the presence of an acid or base as the reactant in order to accept or donate hydrogen ions.
Thus, to determine the acid-base reaction, it has been checked that where there has been an acid or base in the reactants or not. Thus, option C is correct.
For more information about the acid-base reaction, refer to the link:
https://brainly.com/question/25280500
in a plant,root cells are different from leaf cells because they have no ?
Answer:
Answer. As a leaf cell is a plant cell contains chloroplasts for photosynthesis which the root hair cell does not have, leaf cell also contains larger vacuoles and the presence of a cell wall.
Explanation:
How many milligrams are equal to 0.0265 pounds?
(Dimensional Analysis)
Please show how you got that answer.
Answer:
37.73 pounds
Explanation:
just trust me.
Based on the tiles shown, how many meters per second is equivalent to 72 kilometers per hour?
Answer:
10 kilometers per hour
Explanation:
