Answer:
X2Z3
Explanation:
Based on the clues, X is a metal and Z is a non-metal.
X could be aluminum and Z would need to be an element from the oxygen family.
Which reactant (X) is missing from the equation shown?
X+ PO4 → H3PO4
Answer:
H
Explanation:
b/c the polyatomic PO4¯³
have 3 valance number
which of the following is unbalanced
A. SnO2 + H2 → Sn + 2 H2O
B. 2Na + 2H2O → 2NaOH + H2
C. N2O5 + H2O → HNO3
D. 2Fe + 3Cl2 → 2FeCl3
Answer:
The unbalanced chemical equation is;
C. N₂O₅ + H₂O → HNO₃
Explanation:
In balancing a chemical reaction equation, only the coefficients of the terms of the reactants and/or the products are adjusted (and not the subscripts to the atoms in the compounds) to ensure that the total number of each element is the same on either side of the arrow for the chemical reaction
A coefficient term is the number multiplier of the compounds and elements in a chemical reaction
Therefore, the balanced chemical equation is obtained by changing the coefficient of the product from the implied '1' to a '2' as follows;
N₂O₅ + H₂O → 2HNO₃
Which properties do all liquids share?
A. Fixed shape; volume that depends on container
B. Fixed volume; shape that depends on container
O C. Fixed volume and fixed shape
D. Volume and shape that depend on container
Can someone help me with this please?
What is the molar mass for MgO?
Answer:
40.3044 g/mol
Explanation:
35 Before the discovery of oxygen some scientists had a different theory about burning.
What did they believe was present in all substances that burned?
A air
B hydrogen
C phlogiston
D reactivity
Answer:
B i have to search it like 23 hours to find it but Thank you for sharing your question :)Percentage of isotopes in 35/17 Cl and 37/17 Cl with the molar mass of chlorine as 35.5g and the mass of each nucleon to be 1.0000 amu
Answer:
The abundance of 35/17 Cl is 75% and 25% of 37/17Cl
Explanation:
The molar mass of an atom is defined as the sum of the masses of each isotope times its abundance, that is:
35.5amu = 35amu*X + 37amu*Y (1)
Where X is the abundance of the 35/17Cl and Y the abundance of 37/17 Cl
As there are just these 2 isotopes and the abundances of both isotopes = 1:
X + Y = 1 (2)
Replacing (2) in (1):
35.5 = 35X + 37(1-X)
35.5 = 35X + 37 - 37X
-1.5 = -2X
X = 0.75 = 75%
And Y = 100-75% = 25%
The abundance of 35/17 Cl is 75% and 25% of 37/17ClWhich describes the path of energy that a gas powered car uses to drive along a road?
A. nuclear energy to light energy to electrical energy
B. chemical energy to heat energy to mechanical energy
C. mechanical energy to electrical energy to light energy
D. gravitational energy to kinetic energy to electrical energy
Answer:
mechanical energy to electrical energy to light energy
respond if you got a min to help me with my problem
Answer:
I mean i dont know......
Explanation:
pls help asap!!!!!!!
which of the following correctly represents the radioactive decay of cesium-137?
I didn't really understand the explanation, can it be broken down
Answer:
40.06
Explanation:
(23 * 39) + (48 * 40) + (29 * 41)
100
= 40.06
formula:
(% of isotope A * mass of A) + (% of isotope B * mass of B) ......
100
Answer:
yes it can be broken down
There are three bulbs powered by a battery. What will happen if the middle light burns out.
Answer:
nuclear war ;P
Explanation:
Describe the structure of the beryllium atom. In your answer make reference to the number of sub-atomic particles and where they are found in the atom.Immersive Reader
(5 Points)
Answer:
The nucleus consists of 4 protons (red) and 5 neutrons (orange). Four electrons (white) occupy available electron shells (rings). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Subatomic particles are particles that are smaller than the atom. Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P."
hope this helped:)
brainliest?
A beryllium atom has atomic number 4 where its nucleus has 4 protons and 5 neutrons and 4 electrons revolving around the nucleus in in the shells.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
Learn more about atom,here:
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Which of the following statements BEST explains the data in the table?
А
The acceleration determines the total distance traveled,
B
The acceleration determines the change in velocity
С
There is a constant acceleration when an object is moving,
D
The greater the velocity is of an object the greater the acceleration of the object)
Answer: b
Explanation:
What is this molecule an
example of?
A. an atom
B. a mixture
C. an element
D. a compound
PLEASE HELP ASAP
Answer:
D. Compounds
Explanation:
Because it's says that have 3 components
It took 25 seconds for a horse to complete a 400 meter race. What was the speed of the horse?
Answer:
v = 16 m/s
Explanation:
Given that,
Distance, d = 400 m
Time taken, t = 25 s
We need to find the speed of the horse. Speed is equal to distance covered divided by time taken. So,
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{400\ m}{25\ s}\\\\v=16\ m/s[/tex]
So, the speed of the horse is 16 m/s.
Which is correct ? I’m really confused
Answer:
A. Florine has a stronger pull than Magnesium
Explanation:
Electronegativity refers to the tendency in which an tom would attract electrons to itself.
Below each element in the periodic table is their electronegativity value. Florine has the highest electronegativity value of 4.0.
Going through options;
A. Florine has a stronger pull than Magnesium
Florine = 4.0
Magnesium = 1.2
This correct
B. Hydrogen has a stronger pull than Phosphorus
Hydrogen = 2.1
Phosphorus = 2.1
This is wrong
C. Potassium has a stronger pull than Sodium
Potassium = 0.8
Sodium = 0.9
This is wrong
D. Iron has a stronger pull than Bromine
Iron = 1.8
Bromine = 2.8
This is wrong
What can be inferred from the graph?
do the yoga boi TUT yooooooooooooooooooooo9ooooooooot
Shape of a molecule having four Bond pairs and two lone pair of electron will be
Answer:
bipetal
Explanation:
this is because 2 electrons will be donated by each element, as seen in NO2
what are some compare and contrasts between Terrestrial Planets and Gas Planets?
What volume of chlorine gas (Cl2), measured at STP, can be produced by the decomposition of 73.0g of hydrogen chloride gas (HCl), according to the balanced equation? (the other product is hydrogen gas (H2))
Answer:
Explanation:
2HCl = H₂ + Cl₂
2 mole 1 mole 1 mole
73 gram HCl = 73 / 36.5 = 2 mole of HCl
2 moles of HCl will produce 1 mole of chlorine gas .
At STP , one mole of chlorine gas has volume equal to 22.4 litre .
What is the empirical formula of a compound that contains 85% Ag and 15% F by mass?
Answer: AgF
Explanation: 85 / 108 (the relative atomic mass of Ag) = 0.79
15 / 19 (the RAM of F) = 0.79
This is a 1:1 ratio so the empirical formula is AgF.
AgF is the empirical formula of a compound that contains 85% Ag and 15% F by mass.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Molar mass of Ag =108 amu
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
85 ÷ 108 = 0.79
The molar mass of F = 19amu
[tex]Moles = \frac{mass}{molar \;mass}[/tex]
15 ÷ 19 = 0.79
This is a 1:1 ratio so the empirical formula is AgF.
Hence, AgF is the empirical formula of a compound that contains 85% Ag and 15% F by mass.
Learn more about moles here:
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The 2s orbital is at n=2. *
True
False
Answer:
Try true
Explanation:
But note I'm not sure
Explanation:
it is true
hope I helped you!! :))
How are you able to light a bunsen burner
Answer:
Lighting Bunsen Burner:
Explanation:
Close needle valve and collar. Open gas valve fully. Open needle valve 1/2 turn. Use the spark/lighter to light the flame.
Name a non-metal used to make electrode in the cell.
Answer:
graphite
Explanation:
graphite is also good conductor of electricity
WILL GIVE NRAINLIEST!! NEED HELP FAST
7. (50 points) If you have 25 grams of Aluminum (Al), how many moles of hydrogen
gas (H) can you make? Show work!
which value of gas constant (R)use and when ?
in ideal gas equation.
Answer:
R is universal gas constant
It is has fixed value which would depend upon the units in which P,V and T expressed in the equation PV=nRT
R=
nT
PV
Answer:
value of R=0.0821atm,mol-¹k-¹
I need help pls...Thanks
Answer:
4. 125°C
Explanation:
I hope this helps you :D
Answer:
Explanation:can you take a pic of it a little up so i can see the h please??
1. How many atoms of oxygen are present in 0.04 mole NaNO3?
2. How many moles of nitrogen atoms are present in 10.5g of N2O5?
3. How many atoms of oxygen are present in 50g of Fe(H20)2(S04)3? Please answer fast
Answer:
1. 7.227x10²⁴ O atoms
2. 0.1944 mol
3. 3.18x10²³ atoms
Explanation:
1. To solve this problem we need to use Avogadro's number, which states the number of molecules that are in 1 mol of a substance:
0.04 mol NaNO₃ * 6.023x10²³ molecules/mol = 2.409x10²⁴ molecules NaNO₃There are 3 O atoms per NaNO₃ molecule, thus the answer is (3* 2.409x10²⁴) 7.227x10²⁴ atoms.
2. First we convert 10.5 g of N₂O₅ into moles, using its molar mass:
10.5 g N₂O₅ ÷ 108 g/mol = 0.0972 mol N₂O₅There are 2 N moles per N₂O₅ mol, thus the answer is (2*0.0972) 0.1944 mol.
3. First we convert grams into moles:
50 g Fe(H₂O)₂(SO₄)₃ ÷ 379.85 g/mol = 0.132 molThen we use Avogadro's number:
0.132 mol * 6.023x10²³ molecules/mol = 7.95x10²² molecules Fe(H₂O)₂(SO₄)₃There are 14 O atoms per Fe(H₂O)₂(SO₄)₃ molecule, so the answer is (7.95x10²² * 4) 3.18x10²³ atoms.