Answer:
ya um i though i know it
Explanation:
A reaction expected to produce 245.6 g of a product produces 122.1 g of the
product. What's the percent yield?
Answer:
50%
Explanation:
% yields =(experimental yields / theoretical yields ) x100%
= 122.1÷ 245.6 ) x100% = 50%
A substance is made up of slow-moving particles that have very little space between them. Based on this information,
what can most likely be concluded about this substance?
It is not a gas because its particles do not move continuously
It is a gas because its particles move continuously in a straight line.
It is not a gas because its particles do not have large spaces between them.
It is a gas because its particles move in many different directions.
Answer:
It is not a gas because its particles do not have large space between them.
The substance should be
It is not a gas because its particles do not have large space between them.
The following information should be considered;
A substance should be made of particles i.e slow moved also they have little space so here it is not treated as the gas since the particles does not have huge spaced between them.Therefore, the other options are wrong.Learn more;
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A certain ore is 20.7% nickel by mass. How many kilograms of this ore would you need to dig up to have 70.0 g of nickel?
Answer:
0.3382 kg
Explanation:
From the illustration:
100g of the ore would contain 20.7 g of nickel by mass. In order to obtain 70.0 g of nickel, the amount of the ore needed would be:
100 x 70.0/20.7 = 338.16 g
According to conversion units:
1 g = 0.001 kg
Hence,
338.16 g = 338.16 x 0.001 = 0.3382 kg
Therefore, 0.3382 kg of the ore would be required in order to obtain 70.0 g of nickel.
Amount of core in Kilogram is 0.338 kg (Approx.)
Given that;Percentage in every ore = 20.7%
Amount of nickel = 70 gram
Find:Amount of core in Kilogram
Computation:Amount of core in Kilogram = Amount of nickel / Percentage in every ore
Amount of core in Kilogram = 70 / 20.7%
Amount of core in Kilogram = 70 / 0.207
Amount of core in Kilogram = 338.16 gram
Amount of core in Kilogram = 0.338 kg (Approx.)
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18. The density of rubbing alcohol is .789 g/ml. What is the mass of rubbing alcohol in a 500-ml bottle of rubbing alcohol?
Answer:
The number of milliliters of isopropyl alcohol that are in a 400 ml bottle of this solution is 280 Ml
Explanation:
% V/V = volume of solute/ volume of solution x 100
Let the volume of solute be = y ml
the volume of solution = 400 ml
convert 70% to fraction = 70/100
by substituting the value in the equation
= y ml/ 400 ml = 70/100
by cross multiplication
100y =400 x70
100y= 28000
y= 280 ml
Mixing two clear liquids results in the formation of a whit solid. Is this a physical or chemical change?
Answer:
Chemical Change
Explanation:
It became white and became solid which makes it a chemical change.
Given that the density of water is 1.00 g/mL, the density of toluene is 0.867 g/mL, and the density of chloroform is 1.48 g/mL, what layer corresponds to what compound?
The temperature of a container of oxygen gas is increased from 149 k to 298 k which of the following statement is true
Answer:
______is used in production of hard disk.
Explanation:
Which of these limiting factors is MOST likely to affect low-growing plants in a tropical forest? Group of answer choices air water shelter sunlight
Answer:
air, water, sunlight
Explanation:
A limiting factor may be defined as a environmental condition or a resource that can limit the plant growth as well as distribution or the abundance of an organism or its population within the ecosystem. The ability of any plant species to grow and spread throughout any geographic area is the direct result of the adaption to its biotic and abiotic components of that region.
Some of the factor that affect the plant growth are : sunlight, air, proper temperature, moisture, nutrients, wind,etc.
The lack of the any one of the above essential component will determine the health of the plant.
Rutherford’s experiments determined that the nucleus of an atom has all of the following characteristics EXCEPT that
Answer: were used to bombard metal thin foil
Hope it helps! :)
Best answer tests always include the correct answer as one of the possible answer choices.
Please select the best answer from the choices provided
T
ОО
F
Answer:
Its true
Explanation:
Answer:
it is TRUE on edge
Explanation:
What is the difference between Mn2+ and Mn3+? What are they called?
Answer:
i don't now
Explanation:
B-)o:-)(^^)(^^)❌❌✴️
A graduated cylinder had 20mL of water. A sample of pyrite was placed in the cylinder and the volume moved to 35 mL. What is the volume of the pyrite?
Name 3 common compounds, using both their chemical symbol and their name
Answer:
carbon dioxide, CO2
dihydrogen monoxide, H2O
sodium chloride, NaCl2
The three chemical compounds used in the daily life are carbon dioxide (CO2), ammonia (NH3), and water (H2O).
What is a chemical symbol?Chemical symbols are acronyms for chemical elements, functional groups, and chemical substances that are used in chemistry.
Chemical element symbols are typically composed of one or two letters from the Latin alphabet, with the first letter capitalized.
A chemical symbol, also known as an element symbol, is a letter or a combination of letters that represents a chemical element.
Because it is shorter and easier to write, the chemical symbol for an element is used when writing the chemical formula for a molecule or when writing a chemical equation.
Carbon dioxide (CO2), ammonia (NH3), and water are the three chemical compounds encountered in daily life (H2O).
Thus, these are some of the examples of chemical compounds.
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5.
2. Which of the following statements
indicates that a new substance is
forming?
a. A liquid is changing to a solid
b. Metal is melting
C. A substance is fizzing or
bubbling
d. A liquid evaporating to a gas
Answer:
A. A liquid is changing to a solid
hope this helps
Which one of the following are quantitative? Choose 1 * 1. The liquid floats on water. 2. The metal is malleable. 3. The liquid has a temperature of 55.6 degrees C.
Answer:
Hey there!
Quantitative measurements have data and statistics. For example, the liquid has a temperature of 55.6 degrees C is a quantitative measurement.
Let me know if this helps :)
Identify an example of matter and energy conservation in the world around you
Answer:
Example of the matter is ball and example of energy conservation is switching off the light.
Explanation:
The matter refers to anything that has mass, occupies some space, and has some volume. Therefore, the example of the matter is a ball, here we can see that ball occupies some space and it has volume as well as mass.
Moreover, the example of energy conservation is switching off the light when there is no use of lights. Switching off the light will conserve the consumption of energy.
Answer:
"Water can produce electricity. Water falls from the sky converting potential energy to kinetic energy"
The study of earthquakes is part of which branch of science
Answer:
Seismology
Explanation:
Seismology is scientific discipline that is concerned with the study of earthquakes and of the propagation of seismic waves within the Earth. A branch of geophysics, it has provided much information about the composition and state of the planet's interior.
Hope this helps :)
what is emprical evidence
Answer:
the correct answer is
Empirical evidence is the information received by means of the senses, particularly by observation and documentation of patterns and behavior through experimentation. The term comes from the Greek word for experience,
Explanation:
hope this helps you!!
Roll a die and spin a spinner . This example contains
what is the function of spines ?
Answer:
The spine is also designed to protect your spinal cord. The spinal cord is a column of nerves that connects your brain with the rest of your body, allowing you to control your movements. Without a spinal cord, you could not move any part of your body, and your organs could not function.
Where does water seem to defy gravity in the straw or water jug
Answer:
a capillary action moves water upward defyinggravity
Find 1.635 x 3.2 please help will mark brainlyest
Answer:
5.232
Explanation:
summerize in your own words Continental crust is much thicker than oceanic crust (averages between 20 to 25 miles thick), but is actually slightly less dense than oceanic crust. The main type of rock on continents is called granite. So if these two types of crust were to collide into each other, what do you think would happen to the oceanic crust? As a whole, notice that the crust is lighter than the mantle. It is sometimes said that the crust "floats" on the mantle like an iceberg in water and that is not too far from the truth and is called isostacy. Finally, the crust is the coldest, most rigid, and brittle layer with lots of folds and fractures.Recall that oceanic crust is denser than continental rock like granite. Thus when two tectonic plates collide, the denser oceanic crust will subduct underneath the lighter continental crust. If the subducting rock becomes stuck, vast amounts of energy builds up. But once the pressure and energy is too great, the rock will rupture creating powerful earthquakes. As the subducted material sinks further, it will begin to melt under great heat and pressure, becoming less dense as it melts, and rise up as magma to form dangerous composite volcanoes. Mountain ranges created by oceanic-to-continental convergence are the Andes mountains in South America, the Cascades in the western United States, and the Ring of Fire in the Pacific Ocean.
Continental crust is much thicker than oceanic crust (averages between 20 to 25 miles thick), but is actually slightly less dense than oceanic crust. The main type of rock on continents is called granite. So if these two types of crust were to collide into each other, what do you think would happen to the oceanic crust? As a whole, notice that the crust is lighter than the mantle
Lesson 9: Matter Unit Test Physical Science A Unit 1: Matter
My favorite student weighs in at 125 pounds. How many
kilograms do they weigh?
Answer:
56.69905
Explanation:
The conversion factor from pounds to kilograms is 0.45359237, which means that 1 pound is equal to 0.45359237 kilograms.
the boiling point of a sample of pure water is found to be 102.6 degrees Celsius instead of 100 degrees Celsius at sea level state two factors that may have been resulted to this change
Answer:
Because the atmospheric pressure at higher altitudes is lower than at sea level.
Water, or any liquid for that matter, boils when its vapor pressure equals the external pressure above the liquid.
Alchemy is a branch of ancient knowledge that states lead metal is a form of gold metal. Which of these best explains whether alchemy is a science or pseudoscience? It is a science because ancient knowledge is often reliable. It is a science because metallurgy is known to be a branch of science. It is pseudoscience because ancient knowledge is mystical yet reliable. It is pseudoscience because each metal is known to be a unique element.
The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
What is Alchemy ?
Alchemy began to fully evolve into chemistry in the 17th century, with a greater emphasis on rational thought and experimentation and less emphasis on spirituality and mysticism.
The alchemists were never successful in changing lead into gold, but modern nuclear physics can accomplish this task.
Therefore , The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
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What is 5.0553 x 10^-4 in standard notation?
Answer:
0.00050553
Explanation:
when the power of ten is negative, move the decimal to the left
hope this helped!
The mass spectrum of a sample of a pure element is shown above. Based on the data, the peak at 26amu represents an isotope of which of the following elements?
A) Al with 13 neutrons
B) Mg with 14 neutrons
C) Fe with 26 neutrons
D) Ti with 26 neutrons
Answer:
The answer is B
The correct answer is option B: Mg with 14 neutrons
The mass spectrum shows the charge to mass ratio of atoms. I can be used to sort the isotopes of an element.
Isotopy is a phenomenon in which atoms of the same element have the same atomic number but different mass numbers.
The mass spectrum of atoms separates atoms on the basis of charge to mass ratio of the isotopes.
The isotopes of magnesium are; 24Mg atom which has 12 neutrons 25Mg which has 13 neutrons, and 26Mg which has 14 neutrons.
Hence, the peak at 26amu represents 26Mg which has 14 neutrons.
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Which atom has the same electronic structure as an argon ion?
Answer:
The chlorine atom, which starts with seven valence electrons, gains a single electron and becomes a negatively charged chlorine ion: Cl-. This ion has the same electron configuration as the noble gas argon, and therefore this ion is chemically stable too.