Answer:
0.93L
Explanation:
We'll begin by calculating the number of mole of present 374g of KNO3. This is illustrated below:
Mass of KNO3 = 374g
Molar mass of KNO3 = 39 + 14 + (16x3) = 101g/mol
Number of mole of KNO3 =..?
Mole = Mass /Molar Mass
Number of mole of KNO3 = 374/101 = 3.7 moles
Now, we can calculate the volume of the solution as follow:
Mole of KNO3 = 3.7 moles
Molarity = 4M
Volume =..?
Volume = mole /Molarity
Volume = 3.7/4
Volume = 0.93L
Therefore, the volume of the solution is 0.93L
Answer:
THE VOLUME OF A 4 M SOLUTION THAT CONTAINS 374 g OF KNO3 IS 0.93 L
Explanation:
Number of moles = concentraion * volume
Number of moles can also be written as:
number of moles = mass / molar mass
Calculate the molar mass of KNO3 where (K = 39, N = 14, 0=16)
molar mass of KNO3 = (39 + 14 + 16*3) = 101 g/mol
So therefore:
mass / molar mass = concentration * volume
where;
mass = 374 g
molar mass = 101 g/mol
concentration = 4 M
volume = unknown
Hence,
374 / 101 = 4 * V
V = 374 / 101 * 4
V = 374 / 404
V = 0.9257 dm3
The volume of a 4M solution that contains 364 g of KNO3 is approximately 0.93 L
What structural adaptation of the A. cristatus lizard helps them in the water?
A: strong claws
B: flattened tail
C: large size
D: fishing in herds
The structural adaptation of the A. cristatus lizard that helps them in the water is a flattened tail, option B. The flattened tail acts as a powerful swimming paddle that enables the lizard to move through the water with ease.
What is structural adaptation ?Structural adaptation refers to physical changes in an organism's body structure that enable it to better survive and thrive in its environment. These adaptations can be anatomical, physiological, or behavioral, and are typically the result of natural selection over many generations.
The flattened tail adaptation is especially useful for the A. cristatus lizard, which is a semi-aquatic species that spends much of its time in and around water.
While strong claws may help the lizard climb trees or navigate rough terrain on land, they are not specifically adapted for aquatic environments.
Large size and fishing in herds are also not adaptations that aid in swimming or other aquatic activities. Hence, option B is correct.
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Which is the solubility product expression for Na3PO4(s)?
A. [Na] +3(PO4)3-
B. [Na +3] / [PO43-]
C. [Na +] }[PO43-)
D. [Na] +3/[PO4) 3 -
What type of bond does butter have?
Answer: Covalent Double Bond
Explanation:
Butter is made from saturated fat, which is made from hydrocarbon molecules. A hydrocarbon is a compound containing only carbon and hydrogen bonds. Both of those are covalent bonds.
PLEASE VERY IMPORTANT NEED THISSSSS!!!!
All of the questions will refer to the unbalanced equation below in the image. Balance it, then answer all of the questions.
1. What is the correct value for coefficient (A)? 1, 2, 3 or 4
2. What is the correct value for coefficient (B)? 1, 2, 3 or 4
3. What is the correct value for coefficient (C)? 1, 2, 3 or 4
4. What is the correct value for coefficient (D)? 1, 2, 3 or 4
5. If there is enough energy and H2, then how many moles of Sn02 will react with 2 miles of H2 and produce 1 mole of Sn and 2 moles of H2O? How many moles of SnO2 does this balanced equation represent? 0.5, 1.0, 1.5 or 2.5
6. The reactants in this equation are _____. SnO2 and Sn, Sn and H2O, SnO2 and H2 OR H2 and H2O
7. The products in this equation are _____. SnO2 and Sn, Sn and H2O, SnO2 and H2 OR H2 and H2O
8. The reaction is ______. Endothermic OR exothermic
Answer:
1. A = 1; 2, B = 2; 3. C = 1; 4. D = 2; 5. 1 mol SnO₂, 1 mol;
6. SnO₂ and H₂; 7. Sn and H₂O; 8. Endothermic,
Explanation:
Often, the best way to start is to balance all atoms other than O and H, then balance O, then balance H.
1. Put a 1 in front of the most complicated-looking formula (SnO₂):
1SnO₂ + H₂ ⟶ Sn + H₂O
2. Balance Sn:
We have fixed 1 Sn on the left. We need only 1 Sn on the right. Put a 1 in front of Sn to fix it.
1SnO₂ + H₂ ⟶ 1Sn + H₂O
3. Balance O:
We have fixed 2 O on the left. We need 2 O on the right. Put a 2 in front of H₂O.
1SnO₂ + H₂ ⟶ 1Sn + 2H₂O
4. Balance H
We have fixed 4H on the right. We need 4H on the left. Put a 4 in froth of H₂.
1SnO₂ + 2H₂ ⟶ 1Sn + 2H₂O
Every formula now has a coefficient. The equation should be balanced.
5. Check that atoms balance:
[tex]\begin{array}{ccc}\textbf{Atom} & \textbf{On the left} & \textbf{On the right}\\\text{Sn} & 1 &1\\\text{O} & 2 & 2\\\text{H} & 4 & 4\\\end{array}[/tex]
It checks.
The balanced equation is
SnO₂ + 2H₂ ⟶ Sn + 2H₂O
6. Moles of SnO₂
According to the balanced equation,
1 mol of SnO₂ reacts with 2 mol of H₂.
The balanced equation represents 1 mol of SnO₂.
7. The reactants — on the left of the reaction arrow — are SnO₂ and H₂.
8. The products — on the right of the reaction arrow — are Sn and H₂O.
9. The energy is on the reactant side of the equation, so it is being added to the system.
The reaction is endothermic.
Use the information provided below to answer the
questions.
The isotope lead-208 (208Pb):
g/mol
The isotope strontium-87 (87sr):
g/mol
DONE
Answer:
208 g/mol and 87 g/mol
Explanation:
Number of protons = 82
Atomic mass = 126 + 82 = 208 g/mol
For ^{87}Sr
Number of neutrons = 49
Number of protons = 38
Atomic Mass = 49 + 38 = 87 g/mol
Answer 208 and 87
Explanation:
2. Paraffin and gasoline are both hydrocarbons, and therefore have the same general
chemical formula CnHn+2. As such, paraffin and gasoline are similar in that both do
not contain oxygen. Compare the use of gasoline (which would be similar to
paraffin) versus ethanol as a fuel, considering that gasoline is a hydrocarbon
whereas ethanol also contains oxygen. Compare the use of gasoline versus ethanol
as a fuel, from the standpoint of efficiency, by comparing the amount of energy that
each contains on a per amount of fuel basis.
Answer:
Paraffin combustion produces more energy per gram than ethanol fuel but paraffin fuel has a larger carbon footprint
Explanation:
Paraffin is also known by the standard chemical name alkane with a chemical formula for a paraffin given as follows;
CₙH₂ₙ₊₂
While gasoline, also known as petrol, consists of light weight alkanes and alkenes
The heat of combustion of gasoline is about 47.3 kJ/g
The combustion of gasoline is incomplete as presented in the following equation
[tex]C_x H_y+ O_2 +N_2 \rightarrow CO_2 + H_2O + CO + HC + NO_x[/tex]
Example of complete combustion of octane, however, is given as follows;
2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O + Energy
The source of paraffin is from petroleum
Ethanol fuel can be produced by the fermentation of Sugar
The heat of combustion of ethanol = 1366.91 kJ/mol = 29.664 kJ/g.
2CH₃OH + 3O₂ → 2CO₂ + 4H₂O + Energy
A 52-gram sample of water that has an initial temperature of 10.0 °C absorbs 4,130 joules. If the specific heat of water is 4.184 J/(g °C), what is the final temperature of the water?
Answer:
The final temperature of the water is 28.98 degree Celsius.
Explanation:
It is given that,
Mass of sample of water, m = 52 grams
Initial temperature, [tex]T_i=10^{\circ}C[/tex]
Heat absorbed, [tex]Q=4,130\ J[/tex]
The specific heat of water is [tex]4.184\ J/(g^{\circ} C)[/tex]
We need to find the final temperature of the water. The heat absorbed is given by the formula as follows :
[tex]Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{4130}{52\times 4.184 }+10\\\\T_f=28.98^{\circ} C[/tex]
So, the final temperature of the water is 28.98 degree Celsius.
Answer:
29 degree Celsius
Explanation:
If anyone confused this is the choices:
11 °C
19 °C
29 °C
Estimate 28.98 to 29 for the answer
What is the result of increasing the volume of a gas?
Answer:rising temperature
Explanation:
V is directly propotional to the temperature and inversly to the pressure.
Answer:
this is cause due to increase of pressure
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee question in picture
Answer:
a) Correct: Energy will transfer from cold drink to the ice, causing the drink to get colder
Explanation:
Rey's idea is correct as energy will transfer from cold drink to the ice, causing the drink to get colder.
Energy will transfer from cold drink to ice because energy is always transferred from a body at a higher temperature to a body at lower temperature and that will allow the cold drink to get cool.
So, heat is transferred from the cold drink to the ice causing drink to get colder.
Hence, the correct option is a.
What are the products in a neutralization reaction A. Two elements B.an acid and a base C. An element and a compound D. A salt and water
D. Salt and water
Explanation:
Acid + Alkali -> Salt + water
Explanation:
the following correct choices would include:
Option C. Dissociate in water .
Option D. Electrolytes .
Option F. Are a product of a neutralizing reaction.
Sodium chloride is the scientific name for basic salt, table salt, or halite. In which is a synthetic compound with the equation NaCl.
Hope I could help! :)
when sodium reacts with gold (III) chloride, gold metal and sodium chloride are formed. Balanced the equation and classify it
The reaction between sodium and gold III chloride is a single replacement since sodium is ahead of gold in the electrochemical series
What is a chemical reaction?A chemical reaction has to do with an interaction between two or more reactants to yield products.
Now we know that the reaction between sodium and gold III chloride is a single replacement since sodium is ahead of gold in the electrochemical series hence; 3Na + AuCl3 ----->3NaCl + Au
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Mr. Holmes is busy making a paper mache volcano that he is sure is going to win the national science fair contest. He only has room in the volcano’s vent to put 100g of baking soda and 100ml of vinegar.
Mr. Holmes has 4 different concentrations of vinegar in his lab. The active ingredient in vinegar is acetic acid C2H4O2. Which concentration would give the most intense eruption in the volcano?
Bottle 1 shows that it has 44g of acetic acid in the 1L bottle.
Bottle 2 shows the vinegar has a molarity of 2M acetic acid
Bottle 3 shows it is 4% acetic acid by mass.
Bottle 4 when measured shows a pH of 7.
Answer:
Bottle 2 shows the vinegar has a molarity of 2M acetic acid
Explanation:
2M of acetic acid has higher concentration of acetic acid as compared to other vinegar. In 2M of acetic acid is equals to 120 gram of acetic acid in 500 ml of water which is quiet higher than other concentration of acetic acid in vinegar which is 4%. So Mr. Holmes has to use 2M of acetic acid which will produced high intense eruption in the volcano and win the national science fair contest.
Based on their electronegativities, you would expect ____ elements to pull on electrons more strongly than ______ elements.
Answer:
I interpret the answers as being nonmetallic and metallic.
Explanation:
Nonmetals are in groups 14 - 18. Electronegativity is referred to as the want to attract electrons to an atom. Noble gases (group 18) have eight valence electrons in their outer subshells and are therefore atomically stable. Elements with only 7 valence electrons are very electronegative because they desire to obtain an electron to reach stability more than a group 2 element would (they are more likely to drop electrons by giving away in order to reach atomic stability of a group 18 element). This coincides with electron configuration, which is a very lengthy topic to cover. You can conduct more research if you would need it.
Which energy transformation occurs in an electric motor?
A. electrical to kinetic
B. electrical to thermal
C. potential to kinetic
D. kinetic to electrical
Which question is the best scientific question?
Why does a duck eat?
Does a duck like what it eats?
Should people eat duck?
What does a duck eat most often?
Answer: What does a duck eat most often?
Option D is the best scientific question
Hope it helps....
What does a duck eat most often, this question is the best scientific question. A scientific question is one that may be directly investigated using an experiment or set of data in the field of science.
What is the scientific question ?A scientific question is one that may generate a hypothesis and assist in determining the cause of an observation. A sound scientific hypothesis must be verifiable and quantifiable. You can do an experiment to get the solution.
Then there are the inquiries that seek explanations for why anything exists, why something is the way it is, or why we are here. These inquiries constitute the first type. These are what some refer to as "ultimate" questions that go beyond the purview of science.
Thus, option D is correct.
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How does increasing temperature increase the number of reactions?
Answer:
Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction
Explanation:
What type of energy does water gain as it sits in the sun?
A. Electrical energy
B. Mechanical energy
C. Chemical energy
D. Heat energy
Answer:
heat energy
Explanation:
water in the sun begins to get hot
Answer:
D. heat energy
Explanation:
This energy is in the form of heat. Evaporation occurs when the liquid is heated. For example, as the sun warms the water in a puddle, the puddle slowly shrinks. Water appears to be vanishing, but it eventually comes through the air as a fluid called a water vapor.
hope this helped!
What is the charge of a potassium (K) ion?
The Periodic Table
A. -1
B. +1
C. +4
D. -4
Answer:
B, the charge is +1
Explanation:
science
Answer:
B. +1
Explanation:
What thoughts and feelings have you had about the protests that
have taken place?
Answer: It’s good that there are protests but the looting and destruction needs to stop
Explanation:
How does recycling aluminum cans help the environment?
Answer:
C.
Recycling aluminum cans saves a considerable amount of energy; it also reduces carbon dioxide emissions and the amount of waste headed into landfills. Collecting your cans for recycling is an important step you can take to help the environment.
Can someone help me I’m stuck
Answer:
the distribution of their components
Explanation:
Homogeneous mixtures = cannot be separated
Heterogeneous mixtures = can be separated
You can identify these mixtures by looking at the distributions of their particles. Therefore, the third answer is correct.
Which of the following are formulations of the second law of
thermodynamics?
A. It isn't possible to transfer heat from an object at a lower
temperature to another object at a higher temperature unless
work is done.
B. It isn't possible to change heat completely into work, with no
other change taking place.
C. Entropy of a system decreases over time.
D. All systems can convert energy from one form to another useful
form with 100% efficiency.
Answer:
A and B.
Explanation:
Thermodynamic is the scientific study of heat energy. Its second law states that; the total entropy of an isolated system can never decrease over time, but it is constant if and only if all processes are reversible.
On thermodynamics, one of the German Physicists, Rudolf Clausius, formulated a statement that; heat energy would not suddenly flow from an object at lower temperature to another object at higher temperature.
Also, Lord Kelvin formulated a statement that; It is impossible to change all heat energy completely to work without losing energy.
Thus from these two formulations, options A and B are both correct.
Answer:
A, B, & D
Explanation:
All of these are accurate statements except C because entropy does not decrease over time
Can someone help me with these chemistry questions? I will name brainliest and this is worth 50 points
What ion is responsible for acids?
How are alkalis different from bases?
Name an alkali.
What is the general equation for a reaction between an acid and a base?
What is oxidation?
Metal + Acid Salt + ????
If an atom lost 3 electrons, what charge would it have?
Why do metals conduct electricity?
What is a positive test for hydrogen?
Answer:
H + ions are for acids
there is one. Essentially a base is a chemical which will react with an acid to form a salt and water only. An alkali is a water-soluble base. Insoluble bases, which are not called alkalis, are all metal oxides and insoluble metal hydroxides.
HCl(aq) + Na(OH)(aq) → H2O + NaCl this is what i know
hey i remembered y metals conduct electricity
Metals contain free moving delocalized electrons. When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor. Electrons will move toward the positive side. Metal is a good conduction of heat.
Explanation:
those are what i know hope it helps
Answer:
H + ions
alkalis are also bases but the difference between them is,alkalis are soluble in water but the bases doesn't. Bases are substances that react with acids and neutralise them.
Potassium hydroxide, KOH.
When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water.
the process or result of oxidizing or being oxidized.
Hydrogen
Metals are excellent conductors because the atoms in a metal form a matrix through which their outer electrons can move freely. Instead of orbiting their respective metal atoms, they form a "sea" of electrons that surrounds the positively charged atomic nuclei of the interacting metal ions .
Positive diagnosis for a lactulose SIBO breath test – typically positive if the patient produces approximately 20 ppm of hydrogen and/or methane within the first 60–90 minutes (indicates bacteria in the small intestine), followed by a much larger peak (colonic response). This is also known as a biphasic pattern.
What is the oxidizing agent in the following equation? Al (s) + 3 Ag+ (aq) produces Al^+3 (aq) + 3 Ag (s)
Answer:
Ag is the oxidizing agent
Explanation:
oxidizing agent in the following equation?
Al (s) + 3 Ag+ (aq) = Al+3 (aq) + 3 Ag (s)
Left side
Al = 1
Ag = 3
Right Side
Al = 1
Ag = 3
So it's balanced already good.
Define
oxidizing agent = An oxidizing agent is the substance that gains electrons and is reduced in a chemical reaction.
Al is the reducing agent.
Ag is the oxidizing agent
what is a pattern in nature
Answer:
Patterns in nature are visible regularities of form found in the natural world. These patterns recur in different contexts and can sometimes be modelled mathematically. Natural patterns include symmetries, trees, spirals, meanders, waves, foams, tessellations, cracks and stripes
Explanation:
The most common source of infectious diseases in water supplies is _______. a. algal blooms b. sewage c. surface runoff d. none of the above Please select the best answer from the choices provided A B C D
Answer:
The correct option is B
b) sewage
Explanation:
Sewage reffers to domestic or municipal wastewater,it is a type of wastewater which is released to the environment by a community of people.It could be industrial effluents, or stormwater from streets. It can be identified by the amount of chemical and toxic constituents, the status of bacteria present.
There is release of sewage into streams and rivers around the world today even in an untreated form, as a result of these the respiration as well as the available Oxygen is consumed because of the organic carbon present in the untreated sewage which makes the river toxic and get people infected with diseases if consumed.
Sewage is made up of different harmful microbes, human can contact diseases from these microorganisms when bathing with the water or make use of it to cook.
Which of the following might a physicist choose to study?
O A. The effects of fast pitches on wooden baseball bats
O B. The effects of water pollution on tadpoles
O C. The amount of salt in human saliva
O D. The amount of iron in moon rocks
Answer:
The effects of fast pitches on a wooden baseball bats.
What is the difference between rain and mist?
A. Rain forms from clouds, while mist forms at Earth’s surface.
B. Rain is warmer than mist.
C. Raindrops are larger than droplets of mist.
D. Raindrops fall straight down while mist moves sideways.
Which of the following is a universal solvent?
H2O
H2O2
C2H5OH
HCl
Answer:
H₂O
Explanation:
H₂O is the chemical formula of water.
Water is regarded as a "universal solvent". The reason behind this is the property of the water. Water is a solvent that can dissolve a variety of substances in itself. Any other liquid cannot dissolve the number of substances that the solvent water can. The reason behind being the universal solvent is the chemical composition and physical characteristics of water.
Why does chemical safety remain a concern today?
A. Chemists really don't know what to do with dangerous chemicals.
B. Chemists are constantly learning more about what makes
chemicals dangerous.
C. Chemists still have many older, existing chemicals that are
dangerous.
D. Chemists don't think about the safety of the chemicals they use.
Answer: B. Chemists are constantly learning more about what makes chemicals dangerous.
Explanation: The safety of chemicals still remains of utmost importance as chemist haven't relented in their strive and curiousness at knowing the compounds, mixtures and elements which makes chemicals dangerous in other to minimize or mitigate the risk of exposure to this chemicals during usage. Chemicals are things we cannot do without as they constitute a lot to the human race in terms of Energy and health. Due to this immense contribution, the safety of chemicals will remain of great priority to chemists.
