Answer:
Tetrahedral
Explanation:
Because there is one central atom (C) and 4 surrounding atoms, you can assume that the molecular shape is tetrahedral. However, it is important to add the valence electrons and assign them to each of the atoms to make sure there are no double/triple bonds or lone pairs. This could change the shape.
C = 4 v.e.
F = 7 v.e.
Cl = 7 v.e.
4 + 2(7) + 2(7) = 32 total valence electrons
There are 6 lone pairs around each outer atom and two electrons in each bond.
(6 electrons x 4 outer atoms) + (2 electrons x 4 bonds between atoms) = 32 electrons
This adds up to the total valence electrons. Carbon wants 8 valence electrons. This is satisfied by the 4 bonds between it and the outer atoms. The outer atoms want 8 valence electrons as well. This is satisfied by the 6 electrons (in the form of lone pairs) and 1 bond between them and carbon.
Which of the following is a reason that the pressure of a sample of gas at a constant volume would fall/decrease 75 mm Hg?
Answer:
The temperature decreased.
Explanation:
Answer:
The temperature decreased. The air particles inside the tire increase their speed because their temperature rises.
Explanation: The combined gas law states that the pressure of a gas is inversely related to the volume and directly related to the temperature. If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase.
Part 1. A chemist reacted 15.0 liters of F2 gas with NaCl in the laboratory to form Cl2 and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1.50 atm.
F2 + 2NaCl → Cl2 + 2NaF
Part 2. Explain how you would determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP.
From the calculation and the data provide, the mass of NaCl is about 115 g.
What is reaction?The term reaction refers to the combination of two or more substances to yield a product.
The equation of the reaction is; F2 + 2NaCl ----->Cl2 + 2NaF
Number of moles of F2 reacted is obtained from;
PV = nRT
n = PV/RT
n = 1.50 atm. * 15.0 l/0.082 atmLK-1mol-1 * 280
n = 22.5/22.9
n = 0.98 moles
If 1 mole of F2 reacts with 2 moles of NaCl
0.98 moles of F2 reacts with 0.98 moles * 2 moles/1 mole
= 1.96 moles
Mass of NaCl = 1.96 moles * 58.5 g/mol = 115 g
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What is the abbreviated electronic configuration of Ca^2+?
Answer:
The electron configuration of a Ca2+ ion is 1s22s22p63s23p6
Explanation:
Answer:
1s², 2s², 2p⁶, 3s², 3p⁶
Explanation:
The general configuration for a regular Calcium atom is :
1s², 2s², 2p⁶, 3s², 3p⁶, 4s²
But it mentions it is a Ca²⁺ ion.
This means it has lost 2 electrons.
Therefore, the configuration is :
1s², 2s², 2p⁶, 3s², 3p⁶
What is the number of moles of ammonia gas formed when 0.5 mole of nitrogen gas is reacted with excess of hydrogen gas?
Answer: 1.5mol NH3
Explanation: 1N2+3H2= NH3
0.5 mol N2x 3NH3/1molN2= 0.5x3= 1.5mol NH3
About how long does it take for the moon to cycle through all its different observable shapes? (2 points)
Group of answer choices
A day
A month
A year
An hour
Are two atoms of the same element identical? pls answer asap need long definition
Atoms of the same chemical element do not always have the same mass because, although the number of protons in the nucleus is the same for all atoms of the same element, the number of neutrons is not. Most elements as they occur naturally on earth are mixtures of several isotopes
hope this will help
Answer:
NO two atom of the same element are typically not identical.EXPLANATION : First of all there is a range of possible states that the electron of an atom can occupy . Two atoms of the same element can be different ifif their electrons are in different states. here is the answer hope It help you please please mark as brainliestHow many ions are in 0.5 moles of NaCl?
Explanation:
Step 1: Write out the chemical formula of the compound.
Magnesium Chloride = MgCl^2
Step 2: Convert moles into number of compounds using Avogadro's number
0.5 moles MgCl^2 ⋅(6.022⋅10^23 - 1 mole MgCl^2)= 3.011⋅ 10^23
Step 3: Determine how many Chloride ions there will be in 1 compound
There will be 2 Cl− ions in each compound (Cl^2 part)
Step 4: Multiply the number from Step 2 by the number in Step 3
3.011 ⋅ 10^23 ⋅ 2= 6.022 ⋅ 10^23
We do this because the ratio is 2 Cl− ions for every 1 compound.
In the case of finding how many ions in general (both sodium and chloride), we would multiply by 3 because there are 3 ions per 1 compound.
I hope this helped!
When studying the immune system in class, Peta concluded that T-cells are more specific to the pathogen than inflammation is.
What did Peta most likely learn that led to this conclusion?
T-cells are made to identify antibodies, while inflammation starts a fever.
T-cells are made to identify antigens, while inflammation starts to make antibodies.
T-cells make antibodies that cause a fever, while inflammation identifies antigens on the pathogens.
T-cells are made to identify antigens, while inflammation fights anything in the affected area.
Mark this and return
Answer:
T-cells are made to identify antigens, while inflammation fights anything in the affected area.
Explanation:
virus antigen on an infected cell fits into the Killer T-cell receptor
T-cell releases perforin and cytotoxins.
Perforin first makes a hole infected cell membrane
Cytotoxins go inside the cell through this hole, destroying it and any viruses inside
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At equilibrium, the total amount of the product(s)
a.is always equal to the total amount of the reactants.
b. is always greater than the total amount of the reactants.
c.is always less than the total amount of the reactants.
d. may be equal to, greater than, or less than the total amount of the reactants.
Answer: D may be equal to, greater than, or less than the total amount of the reactants.
Explanation:
Answer:
The answer is option D
Explanation:
At equilibruim, the total amount of the products may be equal to, greater than, or less than the total amount of reactants.
If you only know the number of protons, you can identify an element.
true or false
Ethanol is being used as an additive to
gasoline. The combustion of 1 mol of ethanol releases
1367 kJ of energy. How many Calories are released?
Answer:
1.Begin energy in kilojoules.
2.Use a conversion factor in convert kilojoules to joules .
3.Use a conversion factor top convert
An example of gas dissolved into water
would be soda.
True
False
Answer:
It would be true cause the example of gas would be coke soda
Explanation:
2.7g of aluminum metal is placed into solution hydrochloric acid to form aluminum chloride and hydrogen gas.
A). Find the mass of the obtained aluminum chloride.
B). Find the volume of the obtained hydrogen gas at STP.
Given: Al=27, H=1, Cl=35.5, at STP: 2g of H2 contain volume 22.4L
Explanation:
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