What is the meaning of valence
Answer:
the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with
Which of the following observations NOT likely describes a chemical change? a A white solid was exposed to ultraviolet light and turned brown. b Two clear liquids were mixed together and a yellow solid formed c A solid was added to water and the mixture was stirred until the solid was no longer visible d A piece of metal was added to a liquid and bubbles formed on the surface of the metal
Answer:
The correct answer would be - c. A solid was added to water and the mixture was stirred until the solid was no longer visible
Explanation:
Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.
when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.
When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.
Thus, the correct answer is option C.
Two descriptions for a sub-atomic particle are listed below: Description 1: Non-charged particle Description 2: Located inside the nucleus of an atom Which sub-atomic particle or particles fit these descriptions?
Answer:
Neutron particle
Explanation:
There's are three sub-atomic particles, two of which are in the nucleus: the neutron and the electron.
The electron has negative charge, whereas the neutral is neutral (without a charge)
I believe this answers your question.
Key Concepts
Choose the letter of the best answer.
1. Which description defines pseudoscience?
A. process of investigation that resembles science and follows scientific methods
B. process of investigation that resembles science but does not follow scientific methods
C. process of investigation that does not resemble science but follows scientific methods
D. process of investigation that does not resemble science and does not follow scientific methods
Answer:
A
Explanation:
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?
Plz helppppp
A graduated cylinder contains exactly 40 mL of water. A rock was dropped into the
cylinder of water. The water level rose to 52 ml. What is the volume of the rock?
Explanation:
first of all you should know that
1 ml = 1 cm³
therefore
increase in volume after putting stone=∆volume
= 52 - 40
= 12 ml
= 12 cm^3
therefore volume of the rock= change in volume= 12cm^3
The volume of the rock dropped into a cylinder containing 40 mL of water is 12 mL.
From the question given above, the following data were obtained:
Volume of water = 40 mL
Volume of water + rock = 52 mL
Volume of rock =?The volume of the rock can be obtained as follow:
Volume of rock = (Volume of water + rock) – (Volume of water)
Volume of rock = 52 – 40
Volume of rock = 12 mLThus, the volume of the rock is 12 mL.
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If you find the mass of a sample to be 42.1 g and the actual mass is 42.0 g. your percent error would be what?
Answer:
0.24%
Explanation:
To find the percent error, first subtract the actual value by the expected value. You can ignore the sign of the difference.
42.0 - 42.1 = -0.1 = 0.1
Divide the difference by the expected value and multiply by 100%.
0.1/42.1 = 0.0024 × 100% = 0.24%
The percent error is 0.24%.
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"
how to Convert 2.00 miles to fathoms?
Answer:
1,760
Explanation:
There are 880 fathoms in a mile. To convert miles to fathoms, multiply the mile value by 880.
So, 2.00 × 880 = 1,760
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 :)
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 are the three different type of solution?explain them.
Answer:
Click at the above pic and the ans will appear.
Hope it helps :)
What is the mass, in grams, of a cube of copper that has a volume of 62.2 cm3?
Answer:
62.2 grams
Explanation:
1 gram (g) = weight of 1 cubic centimeter (cc, cm3)
? g = 62.2 cm3
(1 × 62.2 = 62.2cm3 )
(1 × 62.2 = 62.2g )
62.2g = 62.2cm3
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
Identify the biotic factors in the picture.
A)Deer
B)Rocks
C)Water
D)Grass
Help me plz l
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.
Where does water seem to defy gravity in the straw or water jug
Answer:
a capillary action moves water upward defyinggravity
Describe how the Buchner funnel was used to filter the ocean water. What went through the
filter?
Answer:
ya um i though i know it
Explanation:
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! :)
What is the difference between Mn2+ and Mn3+? What are they called?
Answer:
i don't now
Explanation:
B-)o:-)(^^)(^^)❌❌✴️
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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Roll a die and spin a spinner . This example contains
5/10
SKILL LEVEL
Beginning
Ellias is hungry for popcorn. He grabs a bag from the cabinet
and places it in the microwave. Once it has stopped popping
he opens the bag and finds lots of popped popcorn for him to
enjoy. What type of change occurs as popcorn is cooked?
a. chemical change
b. physical change
C. Material change
D.no change
Answer:
B.
Explanation:
This is physical change as the popcorn has expanded in size.
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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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?
A student measures the mass of an object and obtains three values: 21.57 g,
22.04 g, and 21.35 g. What is the average mass of the object?
Answer:
21.65
Explanation:
The average = total divided by the number of readings
21.57
22.04
21.35
Total = 64.96
Average = 64.96 / 3 = 21.65
Can somebody help me with this it is a science question part #2 ( can you also check my other questions to see if you can answer them).
Answer:
given is 7200 km in 9 hours, formula is s=d/t, work is 7200/9, answer is 800km/h
Lesson 9: Matter Unit Test Physical Science A Unit 1: Matter
Is mowing the lawn a physical change or a chemical change?
Answer:
Physical change
Explanation:
The only change is in the shape, or length in this case, of the object. So its chemical makeup is still the same, it's still grass.
Mowing the lawn is considered a physical change. A physical change is a change in the physical properties of a substance or material without altering its chemical composition.
A physical change is a transformation that alters the physical properties of a substance, such as size, shape, or phase, without changing its chemical composition. In the case of mowing the lawn, the grass is physically cut into smaller pieces, but the individual grass blades themselves remain chemically unchanged.
When you run a lawnmower over a lawn, the sharp blades of the mower cut through the grass, trimming it to a desired height. This action changes the appearance and size of the grass, but it does not alter the identity or chemical composition of the grass. The grass blades are still composed of the same materials, such as cellulose and other organic compounds.
When you mow the lawn, you are cutting the grass blades into smaller pieces, but the grass itself remains the same chemically. The process of mowing only affects the physical appearance and size of the grass, not its fundamental composition.
Therefore, mowing the lawn is considered a physical change.
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Which of the following is a formal science?
Answer:
Formal science is a branch of science studying formal language disciplines concerned with formal systems, such as logic, mathematics, statistics, theoretical computer science, artificial intelligence, information theory, game theory, systems theory, decision theory, and theoretical linguistics.
Explanation:Formal science is a branch of science studying formal language disciplines concerned with formal systems, such as logic, mathematics, statistics, theoretical computer science, artificial intelligence, information theory, game theory, systems theory, decision theory, and theoretical linguistics.