Answer:
yes
Explanation:
Write a neutralization reaction to form the salt k2so4
H2SO4 + 2KCL ----------› K2SO4 + 2HCL
hope it helps you ♡♡
an atom has 19 protons and 20 neutrons. what is the atomic number with steps
Answer:
39
Explanation:
add em up
Which is most likely a physical change?
Answer:
Examples of physical change include changes in the size or shape of matter. Changes of state—for example, from solid to liquid or from liquid to gas—are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.
Explanation:
Drag the tiles to the boxes to form correct pairs.
Match each chemical reaction with the type of reaction that best describes it.
Answer:
The way I just figured it out myself and made another acc to put the answer on :/
Explanation:
The temperature of a 95.4 g piece of copper decreases from 48°C to 25°C when the copper releases - 849 J of heat. What is the specific heat of copper?
Propane burns to form carbon dioxide and water. The equation for the reaction is:
C 3 H 8 (g)+5 O 2 (g) 3 CO 2 (g)+4 H 2 O(l)
3.60d * m ^ 3 carbon dioxide is produced when a sample of propane is burned in 7.25d * m ^ 3 oxygen.
Calculate the volume of unreacted oxygen. Give your answer in cm^ 3
Answer:
Propane burns to form carbon dioxide and water. The equation for the reaction is:
C3H8 (g)+5O2 (g) -> 3CO2 (g) + 4H2O(l)
Explanation:
From the balanced chemical equation, it is clear that:
1mol. of propane reacts with 5 mol. of O2 and forms 3 mol. of CO2.
In terms of volume, the above equation can be rewritten as:
1.0L. of propane reacts with 5.0L O2 and forms 3.0L of CO2.
Since,
[tex]1dm^{3} =1.0L[/tex]
3.60dm^3 of CO2 is formed from how many dm^3 of O2?
[tex]=>3.60dm^3 CO2 * \frac{5.0L O2}{3.0L CO2}\\=6.0dm^3 O2 \\=6.0L O2[/tex]
The volume of unreacted oxygen is:
[tex]7.25dm^3 -6.0dm^3\\=1.25dm^3[/tex]
The volume of unreacted oxygen is 1.25L or 1250cm^3.
Since,
1dm^3=1000cm^3.
Which term best describes Cl in the following reaction? (HELP ASAP)
2NH3 + (OCl)– → N2H4 + H2O + Cl–
A)
Reducing agent
B)
Oxidized
C)
Reduced
D)
Electrolyte
i'm thinking reduced maybe but not sure
Answer:
Yes it is reduced because ocl is the reducing agent
What is a likely result of an increase in average global temperatures on Earth?
A. More predictable weather
B. Rising sea levels
C. Fewer rainstorms and blizzards
D. Falling sea levels
Answer:
A.
Explanation:
Warmer temperatures can also lead to a chain reaction of other changes around the world. That's because increasing air temperature also affects the oceans, weather patterns, snow and ice, and plants and animals. The warmer it gets, the more severe the impacts on people and the environment will be.
Las levaduras son microorganismos usados en la industria alimentaria en diversos procesos, uno de ellos es la fermentación del azúcar para producir alcohol, tal como se representa en el esquema. LEVADURA + AZÚCAR + CALOR ⇒ Dióxido de carbono + alcohol ¿Por qué este proceso se considera una reacción química? *
Porque solamente hay un aumento de temperatura.
Porque el azúcar cambia de estado.
Porque el azúcar se transforma en otra sustancia.
Porque el alcohol se evapora rápidamente.
Respuesta:
Porque el azúcar se transforma en otra sustancia.
Explicación:
Consideremos el cambio representado en el siguiente esquema.
LEVADURA + AZÚCAR + CALOR ⇒ Dióxido de carbono + alcohol
¿Por qué este proceso se considera una reacción química?
Porque solamente hay un aumento de temperatura. NO. El aumento de temperatura no indica una reacción química. Porque el azúcar cambia de estado. NO. El azúcar no cambia de estado. Porque el azúcar se transforma en otra sustancia. SI. En una reacción química, unas sustancias (reactivos) se transforman en otras (productos). Porque el alcohol se evapora rápidamente. NO. La evaporación es un cambio físico.Why do you think there was a rush to mass-produce penicillin around the time of World War II?
Answer:
penicillin could protect mice against infection from deadly Streptococci.
Explanation:
Answer:
In 1940, Florey carried out vital experiments, showing that penicillin could protect mice against infection from deadly Streptococci.
the main group elements on the periodic table are only in which orbitals?
Answer: Abstract. The main group elements are classified as belonging to the s- and p-blocks in the periodic table. They range from gases such as fluorine and oxygen through nonmetals (e.g., boron, phosphorus, and sulfur) and semimetals (metalloids; e.g., germanium) to very reactive metals such as sodium and potassium.
Explanation:
I'll give brainliest. My group has been struggling to answer this. We just need a solid answer with work to pick up our grades at least.
How many grams of Al(OH)3 are produced from 3.00 g of AlCl3 with excess of NaOH?
Explanation:
here u go the Answer with the working:)
how many types of kinetic energies are there? is it 4 or 5 types?
Which of the following would eat a dead rabbit?
A)
carnivore
B)
scavenger
C)
herbivore
D)
omnivore
Answer:
Scavenger
Explanation:
Because scavengers feed on dead of decaying meat
Differentiate between compounds and mixtures using the particle model of
matter.
Answer:
compounds are substance which can be formed by chemically combining two or more elements.
mixtures are substance that are formed by physically mixing two or more substances
This chemical reaction follows the law of conservation of mass. CaO(s) + CO2(g) - CaCO3(s) How much CaCO, will be formed if 2.2 grams of CaO are used for this reaction? Assume there are enough reactants to complete the reaction. The final answer should be rounded to one place after the decimal point.
4.3 grams 2.2 grams 1.1 grams 3.9 grams
please answer quick!
Answer:
the answer is 1.1grams is the currect ans
According to the law of conservation of mass, 1.1 grams of calcium carbonate are formed if 2.2 grams of CaO are used for this reaction.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.If 56 g CaO gives 46.2 g calcium carbonate then 2.2 g CaO will give 2.2×46.2/56=1.1 g.
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Explain if the combination of iron and copper sulfate is an example of a chemical reaction. Use evidence and scientific reasoning to support your answer.
Describe the redox reaction Check all that apply
2Al(s) + 3ZnCl2(g) - 3Zn(s) + 2AlCl3(aq)
Aluminum atoms transfer electrons to chlorine atoms.
Zinc is reduced
Zinc is the reducing agent
The oxidation number of chlorine does not change,
Aluminum is oxidized
Answer:
Zinc is reduced, The oxidation number of chlorine does not change, and Aluminum is oxidized.
Explanation:
A car reaches 80 km/hr, then suddenly crashed into a concrete wall. Without a seat
belt, the crash test dummy slams into the car's dashboard because
A the crash test dummy's kinetic energy drops to zero
B the dashboard is pushed backwards into the crash test dummy
C the crash test dummy continues its motion until acted upon by an unbalanced
force
D Gravity is pulling the crash test dummy in the direction the car is moving
Answer:
C
Explanation:
inertia
inertia is the reluctance of an object at rest or moving to change its state of rest or motion
because the car was moving, the dummy moves with the speed of the car..so when the crash happened the dummy continued to move..it was feeling reluctant to come to rest so was moving
Which of these reactions shows simple chemical decomposition?
I2 + 2NaCl → 2Nal + Cl2
NaF + HCl → HF + NaCl
H2 + I2 → 2HI
2NaCl → 2Na + Cl2
Answer:
last option is the correct answer
Explanation:
you can see that the chemical NaCl is decomposed or broken into its components Na and Cl.
all other equations have formation of a new compound by reaction of 2 elements or compound
Which of the following accurately describes a Brønsted-Lowry acid?
A)
A Brønsted-Lowry acid receives a protein and has a matching conjugate acid.
B)
A Brønsted-Lowry acid donates a proton and has a matching conjugate base.
C)
A Brønsted-Lowry acid receives a proton and has a matching conjugate base.
D)
A Brønsted-Lowry acid donates a protein and has a matching conjugate acid.
Answer:
B. A Brønsted-Lowry acid donates a proton and has a matching conjugate base.
Explanation:
Here's HA is bronsted acid and its conjugate base pair is A-.
Answer:
Explanation:
The actual answer is B. The equation has an acid on one side and a base on the other. The acid donates a proton. Donates means gives up the equivalent of a proton.
Calculate the molality of a solution that contains 51.2 g of naphthalene, C10H8, in 500 mL of carbon tetrachloride. The density of CCl4 is 1.60 g/mL.
Answer: The molality of naphthalene solution is 0.499 m
Explanation:
Density is defined as the ratio of mass and volume of a substance.
[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}} [/tex] ......(1)
Given values:
Volume of carbon tetrachloride = 500 mL
Density of carbon tetrachloride = 1.60 g/mL
Putting values in equation 1, we get:
[tex]\text{Mass of carbon tetrachloride}=(1.60g/mL\times 500mL)=800g[/tex]
Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molarity:
[tex]\text{Molality of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent (in g)}}[/tex] .....(2)
Given values:
Given mass of naphthalene = 51.2 g
Molar mass of naphthalene = 128.17 g/mol
Mass of solvent = 800 g
Putting values in equation 2, we get:
[tex]\text{Molality of naphthalene}=\frac{51.2\times 1000}{128.17\times 800}\\\\\text{Molality of naphthalene}=0.499m[/tex]
Hence, the molality of naphthalene solution is 0.499 m
PLEASE HELP!
mass number - atomic number =
Answer:
Number of neutrons
Explanation:
The mass number represents the number of protons and neutrons combined and the atomic number only represents the number of protons.
mass number - atomic number = number of neutrons
Answer:
mass number - atomic number = number of neutrons
Explanation:
The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. The mass number minus the atomic number represent the number of neutrons.
Which of the following would have the best thermal insulation properties?
A. A cotton sweater
B. A rubber rain_at
C. A down-filled coat
D. A nylon windbreaker
Answer:
C. A down-filled coat via a p e x
Thermal insulation maintains the temperature inside the system and inhibits heat transfer. A down-filled coat would have the best thermal insulation properties. Thus, option C is correct.
What is thermal insulation?Thermal insulation is the property of the substance to resist the heat and energy transfer from a substance of abundance to a lesser concentration. They lack the conducting particles.
It inhibits the heat to get transferred to other substances. The minimum heat transfer is achieved by the structural formation and the choice of the substance.
A down-filled coat is made of insulation material that keeps warm during the winters as its structure can trap and retain heat making the person warm during colds.
Therefore, option C. A down-filled coat best shows thermal insulation.
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1 When the equation
Hg + Agt → __Ag + Hg2+
is correctly balanced using smallest whole numbers, the
coefficient in front of the Ag+ will be
A 5
B 2.
C 3
D 4.
Answer: I think 5
Explanation:
Balanced equations use the whole numbers to conserve the atomic numbers. When the reaction is balanced then 2 will be the coefficient in front of the Ag⁺.
What is a balanced reaction?A balanced reaction has symbols and whole numbers that represent the number of atoms and molecules of the reactants and the products in a reaction mixture.
The reaction between mercury and silver is shown as:
Hg + 2Ag⁺ → 2Ag + Hg²⁺
This can be checked by the redox half-reactions as:
2Ag⁺ + 2e⁻ → 2Ag⁰
Hg⁰ → Hg²⁺ + 2e⁻
Therefore, the silver cation gained two-electron and became a silver atom.
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how does a scientist answer a scientific question
Answer:
Observes and measure
Explanation:
Answer:
they use tests
Explanation:
they search for evidence using experiments,an experiment is a test to see if their explanation is right or wrong. evidence is made up of observations a scientist makes during an experiment
Calculate the volume in Liters of 15 moles of Neon gas (at STP)
At the carnival, a baby was given a helium balloon whose
pressure equaled the atmospheric pressure at the carnival
which was 102.7 kPa. However, the baby wasn't paying
attention and the balloon floated away into the troposphere
where the atmospheric pressure is 97.8 kPa. What is the
positive difference between the pressure in the balloon and
the pressure of the troposphere in atm?
atm
Answer: 0.048 kPa
Explanation: no clue i just looked it up you’re welcome y’all:)
Someone help me am i right or wrong
Answer:
You right!
Explanation:
Answer: Yes your right
Chem pls help me thanks very much
Answer:
Flourine reacts with Sodium bromide to give Silver flourine and Bromine
Hope u understand
Thank You
Please mark as brainliest
Answer:
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