Answer:
C
Explanation:
The enthalpy of the reactants is greater than that of the products.
The statement is true about the exothermic reaction is the enthalpy of the reactants is greater than that of the products. Therefore, option C is correct.
What is an exothermic reaction ?A chemical reaction involves the movement of energy to or from the environment. An exothermic reaction occurs when energy is transmitted to the environment, raising the ambient temperature. Combustion reactions are an example of an exothermic reaction.
Chemical processes known as exothermic reactions generate heat. Therefore, the H of reaction is negative for exothermic processes. Heat is released during an exothermic reaction, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.
Heat is released during an exothermic reaction, raising the temperature of the immediate environment. The environment is cooled through an endothermic process that absorbs heat.
Thus, option C is correct.
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What model would represent individual atoms of different types that repeat to form a crystal
Answer:
Although atoms are the smallest units that can be found in all matter, these atoms have a complex structure when experimentally analyzed. In order to understand almost all concepts in chemistry, it is essential to clearly understand the basic structure of an atom. Crystals are solid compounds made out of a number of atoms or molecules. There are particular arrangements in crystals. These arrangements are called crystal structures. Examining the crystal structure is very important in determine
Explanation:
Answer:
Although atoms are the smallest units that can be found in all matter, these atoms have a complex structure when experimentally analyzed. In order to understand almost all concepts in chemistry, it is essential to clearly understand the basic structure of an atom. Crystals are solid compounds made out of a number of atoms or molecules. There are particular arrangements in crystals. These arrangements are called crystal structures
Explanation:
What is the acceleration of a ball with a mass of 0.40 kg is hit with a
force of 16N?
A. 0.4 m/s2
C. 400 m/s2
B. 40 m/s2
D. 4000 m/s
What is the external force od
Which is the best description of a molecule?
A molecule of an element is composed of at least two types of atoms.
A molecule of a compound is composed of only one type of atom.
A molecule of a compound is composed of at least two types of atoms.
A molecule of an element is composed of exactly two types of atoms.
Answer:
I think its the first one but im not 100%
Explanation:
Answer:
its c :)
Explanation:
brainlist please
How many moles are in a mass of 800.0 g of magnesium?
Answer:
32.92 moles of Mg
Explanation:
To convert grams to moles (Or vice versa) of any chemical compound we need to use the molar mass of the substance (That is, how many grams weighs 1 mole of the chemical).
The magnesium, Mg, has a molar mass of 24.305g/mol. That means in 800.0g of Mg you have:
800.0g * (1mol / 24.305g) =
32.92 moles of MgWhat makes an amoeba different from a cougar?
Answer:
They are single celled organisms and they are microscopic
Explanation:
Which of the following molecules is nonpolar?
O A. CO2
O B. NO
ос. со
O D. SO2
HELP PLEASE I HAVE TO TURN THIS TEST IN 10 MINUTES
An evacuated cylinder has a volume of 50 liters. If 20 liters of nitrogen gas and 20 liters of oxygen gas are pumped into this evacuated cylinder, how much of the cylinder is filled with the two gases?
Only 80 percent because only 40 out of 50 liters are used.
The entire container because gases will expand to fill it.
Only 80 percent because of the low molecular weight of the two gases.
The entire container because of the low molecular weight of the two gases.
In terms of acids and bases, what does neutralization mean?.
Answer:
Neutralization is when the pH (power of hydrogen ions) of a solution is at 7 (considered neutral in the pH scale). This means it's neither acidic nor basic and is neutral. In order to neutralize an acidic solution, you pour in the same amount of a strong base. And in order to neutralize a basic solution, you pour in the same amount of a strong base.
A neutralization reaction will give you salt and water. A common neutralization reaction could be:
HCl (strong acid) + NaOH (strong base) ----> NaCl (Salt) + H2O (water)
Jennifer checked the pressure in her bike tires before school and they had a pressure of 0.890 atm. She checked the tire pressure again after school and they had a pressure of 1.01 atm. Why was there an increase in pressure? Check all that apply.
The temperature increased outside.
The temperature decreased outside.
The air molecules in the tire moved around more rapidly later in the day and collided with the tire
walls with more force.
There was a hole in the tire.
The reasons why there was an increase in pressure after school in Jennifer's bike's tires were:
The temperature increased outside.The air molecules in the tire moved around more rapidly later in the day and collided with the tire walls with more force.Why was there an increase in pressure?As a result of the temperature increasing outside the tires on account of there being more heat during the day time, the air molecules in the tire became heated up and gained more kinetic energy.
This allowed them to move more rapidly and collide with the walls of the tire which much more force so that when Jennifer checked the pressure again, it had increased.
In conclusion, options A and C are correct.
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What volume will 2.0 moles of nitrogen occupy at 720 torr and 20.0°c? formula: pv = nrt (r = 62.396 l•torr/mol•k) 3.5 l 6.6 l 48 l 51 l
The ideal gas law is the state equation of a hypothetical ideal gas. The volume of the nitrogen gas is 51 I.
What is the ideal gas equation?The general gas equation, commonly known as the ideal gas law, is the state equation of a hypothetical ideal gas. The ideal gas equation is formulated as:
PV = nRT
In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
As it is given that the pressure on the nitrogen is 720 torr, the temperature of the gas is 20°C(293 k), and the moles of nitrogen are 2.0 moles. Therefore, using the ideal gas equation the volume of the nitrogen can be written as,
[tex]pv=nRT\\\\v = \dfrac{nRT}{p}\\\\v = \dfrac{2 \times 62.396 \times 293}{720}\\\\v = 50.7834 \approx 51[/tex]
Thus, the volume of the nitrogen gas is 51 I.
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Answer:
answer in picture
Explanation:
A cup of hot chocolate that has been stirred with a spoon.
Which statement describes how heat flows from the coffee to the part of the spoon in the coffee?
Heat flows from the coffee to the spoon through radiation.
Heat flows from the coffee to the spoon through convection.
Heat flows from the coffee to the spoon through conduction.
Heat flows from the coffee to the spoon through radiation, convection, and conduction.
Answer: Heat flows from the coffee to the spoon through conduction.
What pattern is there with regard to valence electrons, oxygen bonding ratio and electron configuration
The elements that have the highest valence electrons, oxygen bonding ratio and electron configuration are found towards the bottom right corner of the periodic table.
What is the periodic table?The periodic table is an arrangement of elements in groups and periods. The groups are vertical while the periods are horizontal and all the elements belong to one group or the other.
The pattern that exists in the periodic table regarding valence electrons, oxygen bonding ratio and electron configuration is that the elements that have the highest valence electrons, oxygen bonding ratio and electron configuration are found towards the bottom right corner of the periodic table.
Learn more about the periodic table: https://brainly.com/question/11155928
Answer:
The further down and to the right one goes, the higher the number of valence electrons, oxygen bonding ratio, and electron configuration.
Explanation:
Chem 101
What is a periodic trend?
O A. An older version of the periodic table
O B. A pattern that appears on the periodic table
C. Any characteristic of the noble gases
O D. A numbering system for the periodic table
Answer:
b
Explanation:
Calculate the mass, in grams, of 2.95 mol of argon, Ar.
mass of Ar:
Calculate the mass, in grams, of 0.627 mol of nitrogen dioxide, NOZ.
mass of NO2:
Answer:
118 g of Ar; 28.8 g of [tex]NO_{2}[/tex]
Explanation:
To convert from moles to grams, you simply multiply by the atomic mass. So the conversion table looks as follows:
[tex]\frac{2.95 mol}{1} *\frac{39.95 g}{1 mol}[/tex]
The mol units cancel, and you are left with 118 g of Argon (117.8525 without sig-figs).
As for the next part of our problem, the first thing we need to do is find the molar mass of [tex]NO_{2}[/tex]. e can do this by adding the weight of all the atoms within the compound:
N + 2(O) = (14.01) + 2(16) = 46.01 g
Then, we repeat the above process, except we use the molar mass we just found instead of the atomic weight:
[tex]\frac{0.627 mol}{1}*\frac{46.01 g}{1 mol}[/tex]
Once again, the mol units cancel, and we are left with 28.8 g of [tex]NO_{2}[/tex] (28.84827 before sig-figs).
BRAINLY I NEED PLS ASP! Its science I NEED HELP PLS
Answer:
B
Explanation:
Answer:
b or c
Explanation:
which ever one u think make more sense
b. inference meaning- a conclusion raeched on the basis of evidence and reasoning
c. scientific notation meaning-a way to express real numbers that are too large or too small to be conveniently written in decimal form.
Which of the following covalent bonds is the most polar?
Select one:
оа. Н-Н
O b. H-N
O c. H-C
O d. H-O
Answer:
D.) H-O
Explanation:
Polarity is determined based on the difference in electronegativity of the atoms. The greater the difference, the more polar the bond. The general trend is that the atoms in the top-right corner of the periodic table are the most electronegative.
A.) is incorrect because H-H has no electronegativity difference, making it nonpolar.
B.) and C.) are incorrect because their electronegativity differences are not the greatest.
D.) is correct because the electronegativity difference between the H and O is the greatest.
Juan Carlos placed 35 grams of ke into a dry, 200-gram container. The top of the container was attached tightly. When the ice was completely melted, the student
A.35
B.165
C.200
D.235
20 POINTS!!
Juan Carlos placed 35 grams of ke into a dry, 200-gram container. The top of the container was attached tightly. The mass of liquid water in the container is the same as ice. Therefore, the option A is correct.
What do you mean by mass ?The amount of matter in a particle or object is represented by mass (symbolized m), which is a dimensionless quantity. The kilogram is the International System (SIstandard )'s unit of mass (kg).
Mass is a quantitative measure of inertia and a fundamental property of matter. It is the resistance that a body of matter offers to change in speed or position when force is applied. The smaller the change produced by an applied force, the greater the mass of the body.
Because the number of particles does not change during a change of state, mass does not change. It makes no difference whether a substance freezes, boils, melts, or sublimates.
Thus, option A is correct.
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Egyptian papyrus with 63% of its original carbon-14 atoms what is the age year
Answer:
help me
Explanation:
plz
What is the Largest water animal!
Answer:
Blue Whale
Explanation:
I hope this helps:)
Answer:
The blue whale!
Explanation:
Hua Tuo, with the character Yuanhua and his childhood name Yan, was a native of Qiao County, Peiguo (now Bozhou City, Anhui), and was an alchemist and physician in the late Eastern Han Dynasty.
Answer:Hua Tuo practiced medicine throughout his life and was proficient in internal medicine, surgery, gynecology, pediatrics, acupuncture and moxibustion. The characteristic is that only a few herbs are used, and only a few herbs are used; Acupuncture is only one or two needles. Before placing the needle, he said to the patient: "Take a certain Xu, if it comes, speak to someone" (the needle will reach a certain part, if you feel it, tell me). Sickness will be cured.
Cold Feet It is January and Sabrina, Kelly and Jill are tired of having cold feet while waiting for the school bus to come in the morning. They decide to design an experiment to test the effectiveness of wool, cotton and nylon as insulators. They fill identical bottles with 200 mL of water at 100oC and place inside each sock. They take the temperature of the water after 20 minutes. Identify the variables::: 1. Independent Variable: 2. Dependent Variable: 3. Identify two constants:
Answer:
Independent Variable : type of insulator material used
Dependent Variable: temperature of water
Constants: Type of bottle used, volume of water in each bottle
Explanation:
In discussing any experiment, the important factors are; the independent variable(s), dependent variable (s) and constant (s).
In this experiment, the type of insulator material (wool, cotton and nylon) was manipulated and the temperature of water when each insulator is used was carefully measured. The type of bottle and volume of water in each bottle were held constant
The nature of insulator material (independent variable) determined the temperature of the water (dependent variable) when the type of bottle and volume of water in each bottle were held constant.
By comparing the temperature of water when the different insulator materials were used, the best insulator material can be deduced.
What is the momentum of a stationary truck with a mass of 2000 kg? Need help ASAP
Answer:
0 its stationary it has no momentum
Explanation:
Which is the electron configuration for bromine?
A) 1s22s22p63s23p64s23d104p5
B) 1s22s22p63s23p64s23d104p6
C) 1s22s22p63s23p44s23d104p5
D) 1s22s22p63s23p64s23d94p5
Answer: A) 1s22s22p63s23p63d104s24p5
Answer:
A
Explanation:
right on edge
PLEASE HELP FILL IN TABLE
In order to determine the concentration of this basic solution (NaOH), you should titrate it with an acid solution of known concentration (HCl)
What is titration?Titration is also referred to as volumetric analysis or titrimetry and it can be defined as a chemical process in which a solution of known concentration (titrant) is slowly added to a solution of unknown concentration, in order to determine the concentration or quantity of the analyte (solution of an unknown concentration)
In this experiment, a titration would be done to determine the concentration of a basic solution (NaOH) by titrating it with an acid solution of known concentration (HCl) that neutralizes the basic sodium hydroxide (NaOH) solution.
At an equivalence point during a titration, the number of moles of acid are equal to the number of moles of base. Thus, we can derive a mathematical expression (molarity) for the analyte and titrant as follows:
[tex]Molarity = \frac{moles\;of\;soute}{Volume\;in\;liters} \\\\Moles\;of\;soute=M \times V\\\\M_AV_A=M_BV_B[/tex]
In conclusion, you'll have to conduct an experiment to determine the unknown parameters and then substitute them into the formula given above.
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When a rock is rolled along the bottom of the stream the rock will become
Answer:
smaller
Explanation:
hope this helps!
Which source of power can reduce emission of carbon dioxide?.
Answer:
Applying smart electric grid technologies can potentially reduce CO 2 emissions. Electric grid comprises three major sectors: generation, transmission and distribution grid, and consumption. Smart generation includes the use of renewable energy sources (wind, solar, or hydropower).
Explanation:
hope this helps
Can you post all the answers for "Mass and Atoms Quick Check" NO need explanation
Which statement describes the quantities that can be found using the number of moles?(1 point)
Question 1: Which statement describes the quantities that can be found using the number of moles?
Answer: It can be used to find the number of molecules, atoms, or ions.
Question 2: A scientist uses 3 g of water (H2O) in an experiment. Which option describes the first step in calculating the number of molecules in 3 g of water?
Answer: Identify the molar masses of H and O.
Question 3: The molar mass of ammonia (NH3) is 17.03 g/mol. Which expression correctly shows how to determine the number of moles of ammonia equivalent to 5 g?
Answer: 5 g×1 mol/17.03 g
Question 4: How many molecules of carbon dioxide (CO2) are there in 0.450 mol of carbon dioxide?
Answer: 2.71×1023
Question 5: When magnesium chloride (MgCl2) is dissolved in water, which statement must be true?
Answer: The sum of the mass of the Mg2+ ions and the mass of the Cl– ions must be equal to the mass of MgCl2.
which Souce energy are commonly
used in our Bhutan?
Answer:
Wind
Explanation:
Because, The strong wind can be used to turn turbine to generate electricity to light the houses in Bhutan.
6. What happens to the movement of molecules when their temperature is
raised?
Q: What happens to the movement of molecules when their temperature is
raised?
A: When heat is added to a substance, the molecules and atoms vibrate faster. Hope this helps!
I need help on this question
Answer:
brain HSHSHSHSHHSSHSHS