Answer:
it allows us to determine what substances will float and what substances will sink when placed in a liquid.
____ are designed to make necessary adjustments to place a satellite into stable orbit.
there an A B C D thing?
Explanation:
890
Answer: thrusters
Explanation: got it right
B. which of the reef organisms are consumers?
Answer: The primary consumers are zooplankton, corals, sponges, Atlantic blue tang, and queen conch.
Explanation:
Which of the following is an example of a chemical property of matter that can be observed?
Weight
Temperature
Flammability
Breaking glass
What is the formula for the compound iodine trichoride?
Answer:
The formula is CI 3 I. Hope this helps!
Answer:
ICl3.
Explanation: trust me
Sodium metal (Na) reacts with chlorine gas ( Cl2 ) to produce solid sodium chloride (NaCl).
A) Write an unbalanced chemical equation for this reaction.
B) explain why the equation is unbalanced
Please help me answer A and B
The unbalanced equations are the equations with different atomic numbers on the sides of the reaction. The unbalanced reaction is Na + Cl₂ → NaCl
What are balanced equations?Balanced equations are the chemical reaction representation that has an equal number of the atomic number of the same species on the left and the right side of the reaction.
An unbalanced equation between sodium metal and chloride can be shown as:
Na + Cl₂ → NaCl
The equation is unbalanced as the number of chloride ions is more on the reactant side than the product side.
The balanced reaction will be:
2 Na + Cl₂ 2NaCl
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Name these compounds according to IUPAC.
IUPAC is the universal nomenclature method that is used to give the names of the chemical compounds. The compounds are ethene, propionaldehyde, and propanone.
What are functional groups?Functional groups are the particular side groups that are added to the main chain to exhibit a specific property and character to the atom. In the first compound, the presence of the double bond makes it alkene, and the two carbons make the compound ethene.
The second compound has an aldehydic group with suffix -al and three carbon making it propanal, similarly, the third compound is propanone as it has ketone as the functional group and three carbon atoms in the chain.
Therefore, the compounds are ethene, propanal, and propanone.
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the non-contact forces portfolio please help I'm just confused about what I'm supposed to do.
The non-contact forces portfolio includes Gravitational force, Magnetic force and Electrostatic force.
What is non contact force?Non contact forces are those forces which are applied on any object without any physical interference or contact.
Some non-contact forces are:
Gravitational force: It acts between two objects and depends on the masses of the object and distance between that objects.Magnetic force: It acts due to the motion of the charged particles.Electrostatic force: It is a type of induced force which is generated due to rubbing of two objects but when it is generated it remains even after removing the contact of previous objects.Hence Gravitational force, Magnetic force and Electrostatic force are the non-contact forces.
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If 65.85g of N2 are placed in 17.5L container, the pressure is 1988 mmHg. What is the temperature of the gas?
Answer: The temperature of the gas if 65.85g of N2 are placed in 17.5L container with a pressure of 1988 mmHg is 1780. 6° C
Explanation:
The ideal gas law states that the volume, pressure and temperature of the a gas is related to the number of moles.
It is represented thus;
P V = n R T
Parameters :
Pressure, P = 1988 mmHg
Volume, V = 17.5 L
number of moles, n = mass ÷ molar mass
mass of N2 = 65.84g
Molar mass of N2 = 28.02 g/ mol
n = 65.85 ÷ 28.02
n = 2. 350 moles.
Temperature = ?
Universal gas constant, R = 8.314 J/mol. K
Calculations :
T = P V ÷ n R
T = 1988 × 17.5 ÷ 2.350 × 8.314
T = 34790 ÷ 19. 5379
T = 1780. 6 ° C
Thus, the temperature of the gas is 1780. 6 ° C
Chemical equations must be balanced to follow the____.
law of conservation of matter
hope it helps...!!!
PLEASE HELP ASAPP!!!!! WILL MARK BRAINLIEST
if 500 g of iron absorbs 22000 cal of heat, what will be the change in temperature? (specific heat of iron = 0.11 cal/gC)
Answer:
400°C
Explanation:
22,000 cal / (0.11 cal/g°C x 500 g) = 400°C
Answer:
400 C degree change
Explanation:
22 000 cal = 500 g * (C) * .11 cal / g-C
C = 22 000 / (500*.11) = 400 C degree change
A student is balancing an equation in her chemistry class. What fact is she using to check her work?
A ).The number of atoms on each side of the reaction arrow must be different.
B).The number of atoms on each side of the reaction arrow must be the same.
C).The number of molecules on each side of the reaction arrow must be the same.
D).The number of elements on each side of the reaction arrow must be the same.
3Na+3CI+AI—>3Na+3CI+AI
Answer:
The answer is B. The number of atoms on each side of the reaction arrow must be the same.
Explanation:
Check your work to make certain you have the same number and type of atoms on the reactants side as on the products side
Bonds occur to make atoms more stable. Covalent bonds occur between _____
Question 41 options:
metals and noble gases because valence electrons are given to noble gases
metals and nonmetals because valence electrons are given to metals
nonmetals and nonmetals because valence electrons are shared
metals and metals because valence electrons are shared
Answer:
nonmetals and non metals because valence electrons are shared
Explanation:
please take note that ionic bond only occur between nonmetals and metals whereas covalent bonds only occur between nonmetals and nonmetals
How can you tell if a substance is an acid or base?
Answer:
To determine whether a substance is an acid or a base, count the hydrogens on each substance before and after the reaction. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substance is the base (accepts hydrogen ions
When would a transformation of chemical energy to electrical energy occur?
A. when the current becomes zero
B. when a reaction produces the same products
C. when electrons stop moving between atoms
D. when there is chemical reaction between metals and nonmetals
I think that the answer MAY be D..............but I don't know.
Answer:
it would occur when there are two different metals involved.
Islam's message of peace if universal, as without it there can be no happiness
A. Good
B. Applicable to all the people in the world
C. Acceptable
D. None of these
ANSWER
B po yung ans:)
Anders Celsius made the __________
discovery of atoms
barometer
Periodic Table of the Elements
Centigrade thermometer
Anders Celsius made the centigrade thermometer.
Which of the following reactions shows a chemical change producing a solid?
2CH₂OH()+30₂(g) → 200₂(g) + 4H₂O(1) 2AgNO3(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO3)2(aq) H₂(g) + O₂(g) → H₂O(l) NaCl(s) → NaCl(aq)
The chemical change producing a solid would be [tex]2AgNO_3(aq) + CaBr_2(aq) --- > 2AgBr(s) + Ca(NO_3)_2(aq)[/tex]
What are precipitation reactions?They are reactions involving two soluble salts with one of the products being an insoluble salt.
In the reaction below: [tex]2AgNO_3(aq) + CaBr_2(aq) --- > 2AgBr(s) + Ca(NO_3)_2(aq)[/tex]
[tex]AgNO_3[/tex] and [tex]CaBr_2[/tex] are soluble salts while [tex]AgBr[/tex] produced is an insoluble salt. The insoluble salt is a solid.
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Answer: 2AgNO3(aq)+CaBr2(aq)—>2AgBr(s)+Ca(NO3)2(aq)
Explanation:
just did on apex; 2AgNO3(aq)+CaBr2(aq)>2AgBr(s)+Ca(NO3)2(aq)
How many grams of sodium hydroxide, NaOH, are needed to make 355.0 mL of a 4.75M solution? The molar mass of NaOH is 40.00 g/mol
Answer:
4198.97404999
Explanation:
In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.
A nuclear fission reaction has mass difference between the products and the reactants of 0.0593 Calculate the amount of energy released by the reaction
a. 1.09 x 10(-45)J
b. 3.28 x 10(-37)J
c. 9.85 x 10(-29)J
d. 8.86 x 10(-12)J
The amount of energy released by the reaction b. 3.28 x 10(-37)J
What is a nuclear fission reaction?A nuclear fission reaction in which the nucleus is divided into numerous small nuclei.
The mass difference is 0.0593
To calculate the energy
[tex]E = \Delta mc^2\\\\c = 3 \times 10^8\;m/s\\\\m = 3.86 \times 10^-^3 \;kg\\[/tex]
Putting the values in the equation
[tex]E = (0.0593) (3 \times 10^8\;m/s)^2 = 5.337 \times 10^1^5[/tex]
Thus, the correct option is b. 3.28 x 10(-37)J
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Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. which word equation best represents this chemical reaction? isopropanol right arrow. carbon dioxide water heat isopropanol right arrow. carbon dioxide water oxygen isopropanol oxygen right arrow. carbon dioxide water heat isopropanol oxygen heat right arrow. carbon dioxide water
Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. the word equation that best represents this chemical reaction is isopropanol oxygen ---> carbon dioxide + water + heat. Option C. This is further explained below.
What are chemical reactions?Generally, A chemical reaction is simply defined as a process that converts compounds known as reactants into distinct substances, known as products.
In conclusion, In the presence of oxygen, isopropanol burns to produce carbon dioxide, water, and heat. This chemical reaction is best represented by the word equation isopropanol oxygen= Carbon dioxide + water + heat
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Answer:
C: isopropanol + oxygen -> carbon dioxide + water + heat
importance of scientific learning
Answer:
scientific literacy provide essential tools for surviving in the news jungle and for responsible citizenship. They also teach us to understand our own actions, to review them critically, and to take care of our rights. This is why science education is important
Explanation:
The energy that must be added to a system to break the bonds of the
reactants is known as _____?
potential energy
kinetic energy
thermal energy
activation energy
Answer:
activation energy
Explanation:
it is activation energy becauseThe activation energy for the forward reaction is the amount of
free energy that must be added to go from the energy level of the
reactants to the energy level of the transition state
HELP QUICKLY PLEASEEE
Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest halogen and is a volatile red-brown liquid at room temperature that evaporates readily to form a similarly coloured vapour.
Answer:
Bromine is a nonmetal in group 7 or group 17, known as the halogens. It has 7 valence electrons.
So the correct answer is "nonmetal, 7 valence electrons"
What pressure will 13 moles of propane, C3H8, be in a 300 L tank when held at a constant temperature of 288 K?
The pressure of the given moles of propane with the given volume and temperature is 1.024atm.
What is Ideal Gas Law?The Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.
It is expressed as;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given the data in the question;
Amount of gas n = 13molTemperature T = 288KVolume of the gas V = 300LPressure P = ?PV = nRT
P = nRT / V
P = ( 13mol × 0.08206Latm/molK × 288K ) / 300L
P = 307.23264Latm / 300L
P = 1.024atm
Therefore, the pressure of the given moles of propane with the given volume and temperature is 1.024atm.
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Select the correct answer. which characteristic is a property of water? a. densest as a solid b. low surface tension c. nonpolar molecules d. strong cohesion e. weak adhesion
The statement that is a characteristic of water is strong cohesion. Details about characteristics of water can be found below.
What are the characteristics of water?Water is a unique molecule which is attributed to its unique characteristics or features.
Water is made up of two hydrogen atoms and one oxygen atom that are chemically bonded to one another.
Some of the characteristics of water are as follows:
Water is a very polar moleculeWater is a universal solventWater has high surface tensionWater has high specific heat capacityWater is less dense as a solid than as a liquidWater has strong cohesive and adhesive propertiesWater has high boiling and freezing pointsTherefore, the statement that is a characteristic of water is strong cohesion.
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Which of the following happens to an acid when it reacts with another substance?
A. Receives hydrogen ion
B. It receives a hydroxide ion
C. It donates a hydroxide ion
D. It donates a hydrogen ion
When an acid reacts in a reaction, it donates hydrogen ion as the only positive ion.
What is an acid?According to Bronsted-Lowry's definition, an acid is a substance that donates hydrogen ions as the only positive ion in reactions.
Following this definition, it can be concluded that when an acid reacts with another substance, it donates one or more hydrogen ions.
A good example is shown in the equation below:
[tex]HCl + KOH --- > KCl + H_2O[/tex]
In the reaction above, HCl donated a hydrogen ion.
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Answer:
a
Explanation:
just took the quiz and this is correct.
If you have 294grams of a decaying isotope, how many grams will remain active after 4 half-lifes?
Answer:
18.375 gm left
Explanation:
1/2 ^4 = 1/16th will be left (see the '4' representing 4 half lives?)
294 * 1/16 = 18.375 gm
When salt is mixed in water, what is the salt and water? A)salt is the solution, water is the solute. B)salt is the solvent, water is the solute. C)salt is the solute, water is the solvent. D)salt is the solvent, water the is the solution
Answer:
in a solution of salt in water, the solute is salt, and solvent is water.
Explanation:
C) salt is the solute, water is the solvent.
Answer:
C
Explanation:
:)
Please HELP
Part 1. A lightly inflated balloon is placed in a freezer. Explain the change to the size of the balloon based on the kinetic molecular theory
Part 2. What would most likely happen to the balloon if it was instead kept outside in the sun for some time? Explain your answer based on the kinetic molecular theory
In both cases, assume the balloon is tied tight enough so that air does not escape. (10 points)
The three macroscopic properties of a gas in terms of the microscopic nature of atoms and the molecules making up the gas is explained by the kinetic theory of gases. The macroscopic properties like pressure, volume and temperature are used to study a gas.
What is kinetic theory of gas?The kinetic theory of gases is a theoretical model which describes the molecular composition of the gas in terms of a large number of submicroscopic particles which include atoms and molecules. Gas is a combination of large number of atoms or molecules.
The kinetic theory of gases considers that the atoms or molecules of a gas are constantly moving point masses which contain a huge inter-particle distance and may undergo perfect elastic collisions.
1. Since the particles are in motion, the average kinetic energy is proportional to the temperature of the gas. So when the inflated balloon is placed in a freezer, the balloon shrinks due to decrease in temperature.
2. When balloon is kept outside in the sun, it will burst due to expansion of gases.
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how many moles of HCI in 72 gm?
