Answer:
The reaction is exothermic as the solution becomes warm.
Explanation:
Hello there!
In this case according to the described reaction between sodium metal and water, we can write up the chemical equation whereas the products turn out to be sodium hydroxide and hydrogen gas:
[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
Moreover, these reactions are known to be highly exothermic, for that reason the solution becomes warm as the reaction releases heat as it goes to completion.
Best regards!
N3- ion name pls help!!
Answer:
N with a charge of (-3) is nitride
Explanation:
What is the mass of sulfuric acid, H2SO4, that is contained in 2.0 L of a 5.85 M solution ?
A-1147.44 grams
B- 0.12 grams
C-11.7 grams
D-98.07 grams
Plutonium is a radioactive material, exposure to which is hazardous to human health, and is one of the few materials that can be used to make a nuclear weapon. The time it takes for half of any initial quantity of plutonium to decay into stable non-radioactive products is roughly:
Answer:
24,000 years
Explanation:
Which of the following pictures is a chemical change, and which is a
physical change? Explain in the boxes next to the picture.
Plz explain
Answer:
left is chemical because its chemicals, and right is physical because the ice cream is melting and thats physical
Explanation:
The Kinetic Molecular Theory describes the behavior as well as the characteristics of an ideal gas. What are the five postulates of this theory? Provide at least 3 examples to describe these postulates.
Answer:
See explanation
Explanation:
The postulates of the kinetic theory of matter are;
Every substance is made up of tiny particles called molecules. Brownian motion and diffusion illustrates this fact.The molecules that compose matter are in constant random motion.There exists an attractive force between the molecules in matter. The attractive forces between gases are negligible. Solids have a definite shape and volume due to a high magnitude of intermolecular forces. Liquids have a volume but no definite shape due to weaker intermolecular forces. Gases have the weakest intermolecular forces hence the do not have both a shape and volume. They take on the volume of the container into which they are put. This illustrates this fact.The actual volume occupied by gas molecules is negligible relative to the volume of the container. The fact that gases are easily compressible illustrates this fact.Temperature is a measure of the average kinetic energy of the molecules of a body.SCIENCE ANSWER ASAP PLEASE!!
What is a chemical bond?
Which of these would be found in a wetland?
Mrs. Cornell and vultures
Cattails and salamanders
Maple trees and cats
Oak trees and squirrels
Answer:
jwjsjdjdhdvjeiejjrjrje
The results of Huy’s eye exam show that he is nearsighted. Which explanation should Huy expect to hear?
“You need convex lenses to shorten the distance that light takes to focus in your eyes.”
“You need concave lenses to shorten the distance that light takes to focus in your eyes.”
“You need convex lenses to lengthen the distance that light takes to focus in your eyes.”
“You need concave lenses to lengthen the distance that light takes to focus in your eyes.” hurrrrrrrrrrry plz
Answer:
You need concave lenses to lengthen the distance that light takes to focus in your eyes.
Answer:
option D
Explanation:
“You need concave lenses to lengthen the distance that light takes to focus in your eyes.”
2023
How many moles are in 12 liters of Cl2?
Answer:
[tex]\boxed {\boxed {\sf 0.54 \ mol \ Cl_2}}[/tex]
Explanation:
A mole is any quantity of a substance that contains 6.02 × 10²³ particles. At standard temperature and pressure, or STP, 1 mole of as is equal to 22.4 liters. This is true for any gas, regardless of the specific kind.
Although it is not specified, we can assume this gas is at STP. Let's set up a ratio using this information: 22.4 L/mol
[tex]\frac {22.4 \ L \ Cl_2}{1 \ mol \ Cl_2}[/tex]
Multiply by the given number of liters: 12
[tex]12 \ L \ Cl_2 *\frac {22.4 \ L \ Cl_2}{1 \ mol \ Cl_2}[/tex]
Flip the ratio so the liters of chlorine cancel.
[tex]12 \ L \ Cl_2 * \frac {1 \ mol \ Cl_2}{22.4 \ L \ Cl_2}[/tex]
[tex]12 * \frac {1 \ mol \ Cl_2}{22.4 }[/tex]
[tex]\frac {12}{22.4 } \ mol \ Cl_2[/tex]
[tex]0.53571428571 \ mol \ Cl_2[/tex]
The original measurement of liters has 2 significant figures, so our answer must have the same.
For the number we found, that is the hundredth place.
0.53571428571The 5 in the thousandth place tells us to round the 3 up to a 4.
[tex]0.54 \ mol \ Cl_2[/tex]
12 liters of chlorine gas at STP is approximately 0.54 moles of chlorine gas.
What is the mass of 925.4 L of hydrogen gas at STP?
Answer:
If this is an idea gas then 1mol takes up 22.4L.
So, knowing how many L you have you can figure out how many mole syou have by doing a simple equation:
[tex]\frac{1mol}{y} =\frac{22.4L}{925.4L}[/tex]
Solve for y.
Then, since you know how many moles you have use the ptable https://ptable.com/#Properties to figure out the mass in grams.
NOTE: The ptable tells you that 1mol of H = 1g.....so this should be an easy calculation :) enjoy
5 The atoms of a certain element each contain 36 protons and 8 valence electrons. Which
statement correctly identifies this element and describes its chemical reactivity? (8.58)
A The element is krypton, Kr, and it is not very reactive.
B The element is chlorine, Cl, and it is highly reactive.
C The element is krypton, Kr, and it is highly reactive.
D The element is chlorine, Cl, and it is not very reactive.
Answer:
dfdfaxc b
Explanation:
Please help I need answer soon.
A volcanic mountain made up of volcanic ash, cinders, and bombs is called a ___________________.
Answer:
Cinder cone
Explanation:
A gaseous mixture contains 5.0 moles of nitrogen and 10.0 moles of helium . What is the total pressure if the temperature is 25 degrees C and the volume is 3.0 L? a) 122 atm
B) 56 atm
d) 2.0 atm
C)3.0 atm
Answer:
A) 122 atm
Explanation:
PV = nRT
Solve for P --> P = nRT/V
n = 10.0 mol + 5.0 mol = 15.0 mol
R = 0.08206 L atm / mol K
T = 25 + 273 = 298 K
V = 3.0
P = (15.0)(0.08206)(298) / (3.0) = 122 atm
What effect could the pollution of Groundwater have on a nearby River, Lake or Stream?
Answer:
please give me brainlist and follow
Explanation:
Contamination of ground water can result in poor drinking water quality, loss of water supply, degraded surface water systems, high cleanup costs, high costs for alternative water supplies, and/or potential health problems. The consequences of contaminated ground water or degraded surface water are often serious.
F or pass? I’m okay with pass
Answer:
pass
Explanation:
pass
A base is a compound that contains the ____ radical.
Answer:
hydroxyl (OH)
Explanation:
hydroxyl (OH)
Consider the following balanced reaction: 4Fe + 302 → 2Fe2O3. If 3.2
g of oxygen gas and 3.2 grams of iron are used in this reaction, which
one is the limiting reactant?
O Iron
O Oxygen gas
O Iron III oxide
O None of the above
I will give brainliest
Which of these is true about nuclear power?
A. Nuclear power is location specific
B. The neutrons released from the reactions are used to do work
C. Extracting energy from nuclear fuels is more expensive than
extracting energy from fossil fuels.
D. Nuclear fuel has a lower energy density than fossil fuels.
SUBN
extracting energy from nuclear fuels is more expensive than extracting energy from fossil fuels
Which of the following statement is not true?
Answer: 2
Explanation: Greenhouse gases are very important in keeping our planet just right. If we have too many Greenhouse gases it would be too hot, but we can't eliminate all of them or it will be too cold
Reactants of a combustion reaction include
select all that apply
Fuel
Oxygen
Water
Carbon Dioxide
Answer: fuel and oxygen are reactants.
Explanation:
Answer:
fuel and oxygen
Explanation:
I take test
PLEASE HELP ME ASAP!! I NEED IT! NO LINKS
Question: The cell shown in the picture has no nucleus, but can reproduce rapidly in the human body causing illness if left untreated. This cell is most like from which Domain?
Answer:
asexual cell
Explanation:there are mainly 2 types sexual and asexual i would say asexual because they grow without another parent and don't have a nucleus.
how many grams is 3.49 moles NaCl
Answer:
m = 204.16 grams
Explanation:
Given that,
No. of moles, n = 3.49
Molar mass of NaCl, M = 58.5 g/mol
We need to find the mass of 3.49 moles NaCl. We know that,
[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=3.49 \times 58.5\\\\m=204.16\ g[/tex]
So, there are 204.16 grams in 3.49 moles NaCl.
Which of the following is a FALSE statement? *
A. Heat moves through solids by by conduction.
B. Molecules move faster in warmer substances.
C. Warm water is denser than cold water.
D. Heat moves through liquids and gases by convection.
Answer:
C: Warm water is denser than cold water
Which of the following chemical reactions is most likely to have the largest equilibrium constant K?
A. CH3COOH(aq) + H2O(l) CH3COO- (aq) + H3O+(aq)
B. HCl(aq) + H2O(l) H3O+(aq) + Cl-(aq)
C. H3PO4(aq) + NH3(aq) H2PO4-(aq) + NH4+(aq)
D. CH3COO- (aq) + H2O(l) CH3COOH(aq) + OH-(aq)
Answer:
The answer to this question is HCl(aq) + H2O(l) = H3O+(aq) + Cl-(aq). HCl is considered a strong acid meaning it is 100% ionized in solution. The equilibrium constant is therefore very large.
Why might changes to an environment cause an organism’s population to decrease?
Use the food web below to answer the following
question.
Frog
Red fox
Grasshopper
Weasel
Goldfinch
Great horned om
Clover
Deer mouse
Which group is not represerted in the food web?
A. producers
B. primary consumers
C. secondary consumers
D. decomposers
Answer:
uhm i believe its D hope i helped
Explanation:
Answer:
D. decomposers
4.0 g of sodium hydroxide NaOH was dissolved in sufficient water to make up 125 mL of solution.
A) Find the concentration of the solution.
B) What mass of sodium hydroxide could be obtained by heating a 20 mL sample of this solution to dryness?
C) If 30 mL of the solution were mixed with sufficient water to produce 480 mL of a more dilute solution, what would be the concentration of the dilute solution?
D) If 200 mL of the more dilute solution were then mixed with 100 mL of the more concentrated solution, what would be the concentration of the mixed solution?
Answer:
(A) 0.80 M
(B) 0.64 g
(C) 0.050 M
(D) 1.6 M
Explanation:
(A)
Convert 4.0 g to moles with molar mass. Convert 125 mL to L.
4.0 g x (1 mol/39.998 g) = 0.100 mol
125 mL x (1 L/1000 mL) = 0.125 L
Molarity = mol/L
Molarity = 0.100 mol/0.125 L = 0.80 M
(B)
Find moles of NaOH with the molarity you just found. And convert 20 mL to L.
Molarity = mol/L
0.80 M = mol/0.020 L
mol = 0.016
Convert moles to grams with molar mass.
0.016 mol x (39.998 g/1 mol) = 0.64 g
(C)
You know the molarity of a NaOH solution (Part A). 30 mL initial volume and 480 mL final volume are given. Dilution question so use the dilution formula.
M1V1 = M2V2
(0.80 M)(30 mL) = (M2)(480 mL)
M2 = 0.050 M
(D)
Dilution question again, use the dilution formula.
M1V1 = M2V2
(0.80 M)(200 mL) = (M2)(100 mL)
M2 = 1.6 M
Oxygen is produced at the positive electrode
Write a balanced half equation for the process at the positive electrode
Answer:
See Explanation
Explanation:
In electrolysis, a solution called the electrolyte is decomposed by the passage of direct current through it.
The points through which current enters and leaves the electrolyte are called electrodes. In electrolysis, oxidation occurs at the anode and reduction occurs at the cathode.
In the electrolysis of water; at the anode oxygen is produced as follows;
4OH^-(aq) -----> 2H2O(l) + O2(g) + 4e
how many grams is 4.2 moles HCL
