Answer:
15
Explanation:
Need help im kinda stuck ;-;
Answer:
the answer is the third figure from left
In the periodic table, elements that have similar properties are grouped in horizontal rows.
True or False?
your answer is False because they elements in the same period row have different properties of the Elements in a same group column have similar properties
what is the molarity (M) of cobalt (II) nitrate?
Answer:
182.94 g/mol is the correct
Explanation:
hope this helps
Answer:
Your answer would be:
182.94 g/mol
Explanation:
Have a great rest of your day
#TheWizzer
H3PO4 +CaCOH)2=Ca3(PO4)2+H20
The equation balance
Answer:
2H3PO4 +3Ca(OH) 2 = Ca3 (PO4) 2 +6H20
elements in the alkali metals tend to make ions with a charge of
Answer:
I believe the answer is positive ions :/
0. 01 M HCl solution has a pH of 2. Suppose that during the experiment, both the universal pH indicator and the cabbage indicator turn orange-red for 0. 01 M HCl. What can you conclude about the the cabbage indicator key? It matches the universal pH indicator and is indicating the proper pH. It should completely match the universal indicator key for all pH values greater than 7 (base). It should completely match the universal indicator key for all pH values. There was some sort of experimental error, because the indicators should never match.
Answer:
a.) It matches the universal pH indicator and is indicating the proper pH.
Explanation:
it says its the answer.
Answer:
Explanation:
An object is thrown vertically from the ground upwards with a speed of 10 m/s. Considering g = 10 m/s2, the maximum height that the object reaches from the ground, in meters, will be:
a) 15.0.
b) 10.0.
c) 5.0.
d) 1.0.
e) 0.5.
How many moles are in 13.0g of potash (KOH)?
Answer:
0.232 moles
Explanation:
because the mass is 13.0g and the relative molecular mass is 56.1049
Which of these is the smallest particle to retain the properties of an element?
Group of answer choices
a molecule
an electron
a proton
an atom
Answer:
A molecule
Explanation:
Because that is what I think ^^~
11
A 1 mole sample of hydrogen gas has the same number of hydrogen atoms as a 2 mole
sample of water molecules (H20).
Answer:
what is the question in this case
The number of atoms in one mole of hydrogen is 6.022 × 10²³. 2 moles of water contains 4 moles of hydrogen thus, 1.2 × 10²⁴. Hence, the statement is false.
What is one mole?Any substance containing 6.022 × 10²³ number of atoms is called one mole of the substance. This number is called Avogadro number. Therefore one mole of every elements contains Avogadro number of atoms.
Thus, one mole of hydrogen gas contains 6.022 × 10²³ H₂.
One mole of water contains 6.022 × 10²³ water molecules. One water molecule is made of two hydrogens and one oxygens. One mole of water contains 6.022 × 10²³ molecules.
Therefore, two moles of water contains 2 × 6.022 × 10²³ = 1.2 × 10²⁴ H₂ Therefore, the number of hydrogen atoms in one mole of H₂ gas and two moles of water are not equal.
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What happens to the coefficients in a reaction when writing the equilibrium constant expression?
A. They become exponents in the equilibrium constant expression
B. They disappear
C. They become multipliers in the equilibrium constant expression
D. They become coefficients in the equilibrium constant expression
Answer:
D
Explanation:
They become coefficients in the equilibrium constant expression
They become coefficients in the equilibrium constant expression. Hence, option A is correct.
What is equilibrium constant expression?At equilibrium, the relationship expressed between the amounts of concentration of products and reactants in a reversible chemical reaction is known as the equilibrium constant.
Consider the equation below:
aC + bD <=> eF
Where
C and D are reactants
F is the product
a, b and e are coefficients
Thus the equilibrium constant (K) is written as follows:
K =[tex][F]^e[/tex] / [tex][C]^a[D]^b[/tex]
From the above illustration, we can see that the coefficients are exponent in the equilibrium constant expression.
Thus, we can conclude that the correct answer to the question is Option A. They become exponents in the equilibrium constant expression.
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Which group of 3 elements are in the 3d sublevel?
Silicon (Si), Phosphorus (P), Chlorine (CI)
Vanadium (V). Nickel (Ni), Iron (Fe)
Zinc (Zn). Palladium (Pd). Osmium (76)
Arsenic (As), Zinc (Zn). Calcium (Ca)
Zinc reacts with Vibranium (II) chloride to produce zinc chloride and Vibranium. Write the word equation for this reaction.
Answer:
The net reaction is Zn(s) + 2H +(aq) → Zn2+(aq) +H 2(g) The Cl− ions are spectators - they don't change. This experiment includes the reaction of zinc with hydrochloric acid.
Answer:
Explanation:
An object is thrown vertically from the ground upwards with a speed of 10 m/s. Considering g = 10 m/s2, the maximum height that the object reaches from the ground, in meters, will be:
a) 15.0.
b) 10.0.
c) 5.0.
d) 1.0.
e) 0.5.
How do I balance _Zn+_HCl➡️_ZnCl_+H2
Answer:
Zn+2HCL➡️ZnCl2+H2
Explanation:
1 zn+ 2 hcl ➡️ 1 zn +2cl and 2 hcl(2hcl)
What’s the answer ????
Answer: For disadvantages, 1,2, and 3.
Calculate the wavelength (m) of light that has a frequency of 2.17 x 10^11 s-1
please help !!
Answer: I’m guessing ibhs and mr Kadda right?
Explanation:I’m stuck too
hello people ~
Which of the reactions is used in black and white photography?
(a) Combination Reaction
(b) Decomposition Reaction
(c) Displacement reaction
(d) Oxidation reaction
Answer:
B. Decomposition reaction
Explanation:
When silver chloride is kept in the sun, it decomposes to form chlorine gas and silver. As the reaction proceeds, the white coloured silver chloride turns grey because of the formation of silver. Chlorine produced in the reaction escapes into the environment as it is produced in the gaseous state.
2AgCl(s) + light → 2Ag(s) + Cl²(g)
As the above reaction is sensitive to light, they are used in black and white photograph.
What was the first animal on the endangered species list?
bald eagle
Great white shark
Saber tooth tiger
humpback whale
Answer:
Saber tooth tiger
Explanation:
Saber tooth tiger is pretty dangerous and around the world are few meaning were killed
Plz help! I don't want internet answers plz :D
1. What determines weight?
2. What does Homogeneous mean?
A weather balloon containing 59.5 L of helium is released at sea level, where the atmospheric pressure is 101.3 kPa. When it gets to an altitude of 4000 m above sea level, the pressure is only 61.7 kPa. What volume will the balloon now occupy, assuming the temperature is the same?
Pls SHOW WORK
Answer:
V2 = 97.7 L
Explanation:
The solve this question, we need to follow the equation below
P1V1 = P2V2
V1 = 59.5L
P1 = 101.3 kPa (because 1 atm equals 101.3 kPa so this one we don't have to do anything) = 1 atm
P2 = 61.7 kPa (must be converted to atm by dividing by 101.3) = 0.609 atm
V2 = ?
P1V1 = P2V2
1 x 59.5 = 0.609 x V2
59.5 = 0.609 x V2
(Dividing both sides by 0.609 to get rid of it)
V2 = 97.7 L
Which element has chemical properties that are most similar to the chemical properties of sodium?
Answer:
Lithium
Explanation:
So, the elements with similar properties to sodium (Na) are all of those elements in the same Group. The ones "most" similar would be the ones closest in mass as well. Those would be Lithium (Li) and Potassium (K)
Which of the following is an example of a phase change from liquid to gas?
A. Water freezing
B. Ice melting
C. Water evaporating
D. Water condensing
SUBMIT
Apex ?
Which of the following could occur as a result of
decreasing the heat energy of a gas?
A. condensation
B. evaporation
C. radiation
D. vaporization
Answer:
A
Explanation:
Because, condensation occurs due to the drop in the temperature of the gas therefore turning into liquid.
How many moles of oxygen gas would be needed to react with 155 g of propane gas,
C3Hg, in a combustion reaction?
C3H8 (g) + 502 (g)
+
-> 3CO2 (g) + 4H20 (1)
Taking into account the reaction stoichiometry, 17.61 moles of O₂ is required to react with 155 grams of C₃H₈.
Reaction stoichiometryIn first place, the balanced reaction is:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₃H₈: 1 mole O₂: 5 moles CO₂: 3 moles H₂O: 4 molesThe molar mass of the compounds is:
C₃H₈: 44 g/moleO₂: 32 g/moleCO₂: 44 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₃H₈: 1 mole ×44 g/mole= 44 gramsO₂: 5 moles ×32 g/mole= 160 gramsCO₂: 3 moles ×44 g/mole= 132 gramsH₂O: 4 moles ×18 g/mole= 72 gramsMass of O₂ requiredThe following rule of three can be applied: if by reaction stoichiometry 44 grams of C₃H₈ react with 5 moles of O₂, 155 grams of C₃H₈ react with how many moles of O₂?
[tex]moles of O_{2} =\frac{155 grams of C_{3} H_{8}x5 moles of O_{2} }{44 grams of C_{3} H_{8}}[/tex]
moles of O₂= 17.61 moles
Finally, 17.61 moles of O₂ is required to react with 155 grams of C₃H₈.
Learn more about the reaction stoichiometry:
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Jim needs to conduct his experiment at STP
Which condition must he use?
0 273 K, 101.3 kPa
100 K, 273 kPa
O 100 K, 273 Pa
O 273 K, 101.3 Pa
Answer:
273 K, 101.3 kPa
Explanation:
the standard pressure he can use is 101.3 kPa and standard temperature= 273 K
Student
# Hours
Student
# Hours
Twenty students were surveyed to find out how
many hours of TV they watch during a school
week. The results are shown to the right. Answer
the following questions and round your answers to
the nearest half hour.
1
2
11
4
2.
5
12
1
3
3
13
2.
The mode of the data is I hours.
4
5
14
6
DONE
5
1
15
2
6
4
16
3
7
6
17
10
8
12
18
10
9
2
19
8
10
6
20
7
Does it is a complete qwestion? It
is not clearef
the first one is "5" and "4.5"
the second one is "2" and "11"
then after that the multiple choice one is "mean" and "median" in other words A and B
your welcome
How does the mass of each atom compare to the average atomic mass of the
element given in the periodic table? *
The mass given in the periodic table is a weighted average of all isotopes of an element. For example Hydrogen is normally just one proton so one would expect its atomic mass to be exactly 1, but there are other naturally occurring isotopes of H (deuterium with a mass of 2 and tritium with a mass of 3) that have more neutrons resulting in a weighted average slightly greater than 1.
The mass of the atoms is given by the number of neutrons and protons. The mass of the atom and the average mass of the element looks a little different due to mass defect.
What is a mass defect?The mass defect has been the difference in the mass and the average mass of the elemental atom. It has been the energy that binds the neutrons and the protons together in the nucleus. The mass and the average atomic mass differ slightly.
The mass of an individual atom differs from the average atomic mass as average atomic mass is the sum of the masses of the isotope of the elements. Isotopes have little difference in masses due to the number of neutrons. For example mass and average atomic mass of hydrogen differs.
Therefore, the mass and the average atomic mass differ.
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9) A solid magnesium flare has a mass of 2300 g and a volume of 703 cm3. What is the density of the
g
magnesium?
Answer:
siks creo que creo que siks
How many grams of FeS are formed from 7.62g of Fe reacted with excess S?
Answer:
12.2g
Explanation:
I took the quiz :)
please can someone tell me the answer and explain
HELP!!!!!
Find the volume of a gas at STP (STP is 0oC and 1atm), if its volume is 80.0 mL at 109 kPa and –12.5oC.
(I will give brainliest. Thank you so much!)
Answer:
90.6 mL.
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Where P is the pressure; V is the volume; n is the number of moles of gas; R is the universal gas constant; and T is the absolute temperature.
Because only P, V, and T changes, we can rearrange the equation to:
[tex]\displaystyle \frac{PV}{T}= nR[/tex]
The right-hand side is some constant. In other words:
[tex]\displaystyle \frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
The initial measurements are 109 kPa, -12.5 °C, and 80.0 mL.
Convert kPa to atm:
[tex]\displaystyle 109\text{ kPa} \cdot \frac{1\text{ atm}}{101.3 \text{ kPa}} = 1.08\text{ atm}[/tex]
And convert temperature to kelvins:
[tex]\displaystyle T_k = (-12.5) + 273.15 = 260.6\text{ K}[/tex]
STP is given by 1 atm pressure and 0 °C (273.15 K). Hence, substitute:
[tex]\displaystyle \frac{(1.08\text{ atm})(80.0\text{ mL})}{(260.6\text{ K})} = \frac{(1\text{ atm})V_2}{(273.15\text{ K})}[/tex]
Solve for volume:
[tex]\displaystyle V_2 = 90.6\text{ mL}[/tex]
In conclusion, the volume of the gas at STP is 90.6 mL.
Check: Volume is indirectly proportional to pressure and directly proportional to temperature. Because we decreased the pressure (1.08 atm to 1.00 atm) and increased the temperature (260.6 K to 273.15 K), we should expect an overall increase in volume.