Why do we use symbols on
the periodic table
Answer:
this lesson you learned that a chemical symbol is a shorthand way to represent an element and that each element on the periodic table has a unique chemical symbol. Chemical symbols are used to standardize the 'language of chemistry' and to identify elements and atoms in a chemical formula easily.23-Dec-2015
What is the chemical formula for aluminum tartrate?
Answer: C12H12Al2O18
Explanation:
Which of the following best defines base isolation?(1 point)
Base isolation is a technique used by engineers to help prevent damage to buildings by volcanoes. The main structure of the building is separate from the base, which allows lava to pass under the building without causing much damage.
Base isolation is a technique used to prevent large-scale damage from volcanoes. New communities being built are set as far back as possible from the base of a volcano.
Base isolation is a technique used to prevent damage to buildings during tsunamis. The main structure of the building is separate from the base, which allows water to pass beneath buildings without causing much damage.
Base isolation is a technique used by engineers to help prevent damage to buildings by earthquakes. The main structure of the building is separate from the base and sits on a bed of springs.
Base isolation is a technique used by engineers to help prevent damage to buildings by earthquakes. The main structure of the building is separate from the base and sits on a bed of springs.
What is base isolation?Base isolation is a technique developed to prevent or minimise damage to buildings during an earthquake.
A base isolation system is a method of seismic protection where the structure (superstructure) is separated from the base (foundation or substructure). By separating the structure from its base the amount of energy that is transferred to the superstructure during an earthquake is reduced significantly.
Hence, option D is correct.
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2NazN + 3MgO -> Mg3N2 + 3Na2O, what is the mole ratio of magnesium oxide to magnesium nitride?
Answer:
3:1 or 3/1
Explanation:
Look at the coefficients then set up ratio. Simplify to the base numbers and you get 3/1 or 3:1. Thus, for every 3 MgO you produce 1 Mg3N2
BRAINLIEST! A reaction is set up between magnesium and hydrochloric acid. After 30 seconds, the magnesium had decreased in mass by 45g. What was the rate of this reaction?
Answer:
Acidic oxides, or acid anhydride, are oxides that react with water to form an acid, or with a base to form a salt. They are oxides of either nonmetals or of metals in high oxidation states.
Explanation:
What organ is known as the windpipe and the tube takes in air ?
Answer:
The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people. The trachea begins just under the larynx (voice box) and runs down behind the breastbone (sternum).
Explanation:
What is climate and what are the two main factors that affect climate?
Need answers within 5 minutes!
Answer:
climate:the weather conditions prevailing in an area in general or over a long period.
2 main factors: temperature and precipitation
Explanation:
Acetic acid (ch3cooh) and trifluoroacetic acid (cf3cooh) are shown by these particulate models. the ka for trifluoroacetic acid is 104 times greater than acetic acid. use the models to account for the differences in magnitude for the ka constant. the green atoms are fluorine, the red atoms are oxygen, the black atoms are carbon, and the white atoms are hydrogen.
Answer:
See explanation
Explanation:
If we look at the models, we will see that the three fluorine atoms in CF3COOH are attached to the carbon that is next to the -COOH group.
As a result of the electron withdrawing effect of the three fluorine atoms, CF3COOH is much more acidic (104 times more acidic) than CH3COOH. This is reflected in the value of the Ka for each acid.
This electron withdrawing effect of the three fluorine atoms also stabilizes CF3COO- much more than CH3COO-.
The reproductive structure of a gymnosperm is the
Answer:
Angiosperms
Explanation
Angiosperms have male sex organs called stamens. On the end of the stamen is the anther. This is where pollen is made. The pollen has to be taken to the pistil or the female part of the flower.
Answer:
Cone
Explanation:
Please help, i will mark brainliest.
Answer:
It’s the second option ; 2,1,3,2
Explanation:
What is the electronegativity difference between sodium and chlorine? What type of bond is this?
Answer:
Sodium chloride is ionically bonded. An electron has transferred from sodium to chlorine. Sodium has an electronegativity of 1.0, and chlorine has an electronegativity of 3.0.
...
The electronegativity difference between sodium and chlorine is 2.23 and the type of bond is ionic bond.
What is electronegativity?The tendency of an atom in a molecule to attract the shared pair of electrons towards itself is known as electronegativity.
Electronegativity is a kind of measure that tells how strongly atoms attract the bonding electrons to them.
Its symbol is a Greek letter that looks like an (X). It is directly proportional to the atom’s attraction for the electrons.
The compounds which form between the elements having a huge difference in the electronegativity are ionic compounds, and also have ionic bonding.
Electronegativity of Sodium = 0.93
Electronegativity of chlorine = 3.16
Difference = 2.23
The type of bond between them is ionic bond.
Therefore, The electronegativity difference between sodium and chlorine is 2.23 and the type of bond is ionic bond.
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is CH3CH2COOCH2 an aldehyde structure?
1. A green rat snake that lives in the grass and a brown rat snake that lives
in the desert is a form of
A. Human genetic modification
B. Selective breeding
C. Natural selection
D. Artificial breeding
Answer:
It is an example of natural selection (option c)
Natural selection is demonstrated by a green rat snake living within that grass as well as a brown rat snake living throughout the desert.
Natural selection:The process throughout which communities of sentient creatures adapt but instead transform is known as natural selection. Persons within a demographic are inherently varied, which means they are all unique under certain manner.
This variance indicates that certain people have qualities that are more adapted to their surroundings over others.
Thus "Option C" is correct.
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At what temperature is breathing rate the highest? *
10 c
15 c
20 c
25 c
Answer:
Depends on what you're doing, you could be running and it goes higher, temperature isn't too much of a difference.
Explanation:
Is changing the color of the coin from copper to silver a physical or chemical change?
Answer:
physical
Explanation:
The zinc (which was already silver) coated the penny. The NaOH dissolved the zinc. (that was what made the water murky) And small pieces of zinc adhered to the penny (coated) It was a physical change because no NEW color was created.
Which best represents a balanced equation?
A. HgO → Hg + O2
B. 2Fe + O2 → Fe2O3
C. 2H2 + 02->2H2O
Explanation:
none of them
mark me as brainlist ok
Answer:
C
Explanation:
4 - H - 4
2 - O - 2
each side of the arrow has an equal amount of elements
How much water does the average person in
the U.S. use on a daily basis?
Answer: The average person drinks 8 cups per day, equaling to 1/2 gallon per day and 182.5 gallons per year.
Explanation:
Answer:
An average of 82 gallons of water a day at home
Explanation:
What happens when you try to separate the atoms by pulling on them?
Answer:
They explode!!!
Explanation:
When atoms separate they release all the energy and particles in themselves and cause a chain reaction to all other atoms causing an explosion
Hope this helps, and have a nice day!
How many grams of KNO3 will dissolve in 100 g of water at 50° to make a saturated
solution
How many moles in 0.672L of F2?
Answer:
c
Explanation:
i think if not tell me ok
1) A) Balance the following equation:
2 Fe + 6HCI →
3 H2 +
2 FeCl3
B) How many moles of hydrogen gas would be produced in a reaction that yields 7.5
moles of iron chloride?
Answer:
A) 2Fe+6HCl=3H2+2FeCl
B) 11.25
Explanation:
A)---
B) 2 - 7.5
3 - x ⇒ 2x = 7.5*3 ⇒x = 22.5/2 = 11.25
A 334 mL sample of hydrogen was collected over water at 23C on day when the atmospheric pressure was 756 mm Hg.The vapor pressure of water under these conditions is 17.54 mm Hg. What volume, in liters, will the dry hydrogen ( No water vapor) occupy at STP?
Answer:
0.299 L
Explanation:
We'll begin by calculating the pressure of dry gas. This can be obtained as follow:
Measured pressure = 756 mm Hg
Water vapor pressure = 17.54 mm Hg
Pressure of dry gas =?
Pressure of dry gas = (Measured pressure) – (Water vapor pressure)
Pressure of dry gas = 738.46 mmHg
Finally, we shall determine the volume occupied at STP. This can be obtained as follow:
Initial volume (V₁) = 334 mL = 334 / 1000 = 0.334 L
Initial pressure (P₁) = 738.46 mmHg
Initial temperature (T₁) = 23 °C = 23 °C + 273 = 296 K
Final pressure (P₂) = 760 mmHg
Final temperature (T₂) = 273 K
Final volume (V₂)
P₁V₁/T₁ = P₂V₂/T₂
738.46 × 0.334 / 296 = 760 × V₂/273
Cross multiply
296 × 760 × V₂ = 738.46 × 0.334 × 273
224960 × V₂ = 67334.2597
Divide both side by 224960
V₂ = 67334.2597 / 224960
V₂ = 0.299 L
Thus, the volume of the dry gas st STP is 0.299 L.
Which of the following is TRUE about a physical change to a substance?
A.
The atoms in a substance will divide.
B.
The mass of a substance will increase.
C.
New substances will likely be formed.
D.
The substance will have the same chemical properties.
Answer:
D.
The substance will have the same chemical properties.
Explanation:
Physical changes do not alter the chemical composition of a substance, so the chemical properties will not change.
Describe the effect of resonance on the amount of rotation that can occur in the main chain of your tripeptide (phenylalanine, alanine, and tyrosine), which affects protein folding.
Answer:
use research.
Explanation:
What happens to the average kinetic energy of gas particles as temperature increases?
Answer:
it dies
Explanation:cause its too cold
The pendulum has the greatest kinetic energy and no potential energy when it is _____.
swinging upward
at the top of the swing
at the bottom of the swing
swinging downward
Answer:
At the top of the swing
Explanation:
If a cluster of stars is all the same color, what could that mean?
Answer:
Cluster HR Diagrams: Since all the stars in a cluster formed at the same time, they are all the same age. A very young cluster will have a HR diagram with a cluster of T-Tauri stars evolving towards the main sequence. ... Each star is plotted by its color and magnitude on the HR diagram.
2K + 2H20 - 2KOH + H2
How much hydrogen gas will be formed by reacting 65 g water?
Answer:gc
Explanation:
Which is the best description of Darwin’s theory of evolution?
A.
It is the same as natural selection.
B.
It is based on the same ideas as Lamarck’s acquired characteristics.
C.
It states that all species evolve over time through natural selection.
D.
It describes DNA passed from parent to offspring as the driving force of evolution.
Answer:
d
Explanation:
stop answering people questions and not actually helping them typing random stuff like i just did here
It describes DNA passed from parent to offspring as the driving force of evolution.
What is evolution?
The basic idea of biological evolution is that populations and species of organisms change over time. Today, when we think of evolution, we are likely to link this idea with one specific person: the British naturalist Charles Darwin.In the 1850s, Darwin wrote an influential and controversial book called On the Origin of Species. In it, he proposed that species evolve (or, as he put it, undergo "descent with modification") and that all living things can trace their descent to a common ancestor.Darwin defined evolution as "descent with modification," the idea that species change over time, give rise to new species and share a common ancestor. The mechanism that Darwin proposed for evolution is natural selection.
therefore option D is the correct answer.
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What are three ways a driver can cause a car to accelerate?
A. Turn the key in the ignition while the car is stopped.
B. Turn the steering wheel while the car is moving.
C. Press the gas pedal while the car is stopped.
D. Press the brake pedal while the car is moving.
The correct answer is:
C. Press the gas pedal while the car is running.
A driver can cause a car to accelerate by pressing the gas pedal.
What is Acceleration?
Acceleration is the rate at which an object's velocity changes over time. It is a vector quantity that includes both the magnitude (or speed) and direction of the change in velocity. In simpler terms, acceleration refers to the rate at which an object speeds up or slows down, or changes its direction of motion.
Acceleration is caused by forces acting on an object, such as a push or pull. In the case of a car, pressing the gas pedal causes the engine to generate more power and push the car forward, resulting in an increase in velocity and acceleration. Conversely, pressing the brake pedal causes the car to slow down and decelerate.
The gas pedal controls the amount of fuel and air that is delivered to the engine, which in turn determines how fast the engine runs and how much power it generates. Other factors that can affect a car's acceleration include the car's weight, the condition of its engine and transmission, the road surface and gradient, and the driver's skills and techniques.
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