Answer: a- 323 b- 15
Explanation:
Give 1 example of each.
Kinetic , Gravitational Potential , Chemical , Sound , & Radiant energy.
bullet fired from a gun
falling apple from tree
stone at a height
rusting of iron
loud speaker
DESCRIBE HOW BALANCING AN EQUATION IS SIMILAR TO COOKING.
How do collisions between molecules transfer energy from a system of
reacting substances to its surroundings?
A. They cause heat to flow from the system to the surroundings.
O B. They cause molecules to flow into the system from the
surroundings
C. They cause the potential energy of the system to increase
D. They cause the thermal energy of the surroundings to decrease.
Answer:
A. They cause heat to flow from the system to the surroundings.
Explanation:
Answer:
A. They cause heat to flow from the system to the surroundings.
Explanation:
a p e x , just took the quiz
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22 How does Earth's tilt affect climate?
OA. smaller the tilt, the warmer the summer.
OB. The smaller the tilt, the smaller the temperature difference is between summer and winter.
OC. The larger the tilt, the warmer the summer.
OD. The larger the tilt, the smaller the temperature difference is between summer and winter.
What are the units for the measurements of radioactive element activity?
Answer:
Bq
Explanation:
The number of decays per second, or activity, from a sample of radioactive nuclei is measured in becquerel (Bq), after Henri Becquerel. One decay per second equals one becquerel.
The radioactive decay has been measured as decay per second by becquerel (Bq).
Radioactive decay has been given as the loss of energy by the nucleus. The release of energy has been in the form of radiation. The varying energy radiations have been termed alpha decay, beta decay, gamma decay.
The decay has been performed by unstable nuclei with the emission of multiple particles. The decay unit has been given by Henri Becquerel. The unit has been the determination of the decay performed per second and has been given by becquerel (Bq).
Thus, the unit for the measurement of radioactive decay has been becquerel (Bq).
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barium can be analyzed by precipitating it as BaSO4 and determining the mass of the precipitate. When 0.269 g sample of barium compound was treated with excess H2SO4, 0.0891g BaSO4 formed. what percentage of Barium is in the compound?
Answer:
Percentage of Ba in the compound is 19.5%
Explanation:
complete the bolded items in each box below
Show the bolded items and the boxes.
Solar energy converts ___ into either ___ energy or electrical energy.
electromagnetic, thermal
electromagnetic, potential
thermal, nuclear
chemical, thermal
Answer:
Hey mate....
Explanation:
This is ur answer.....
Solar radiation can be converted either into thermal energy (heat) or into electrical energy.Hope it helps!
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if the velocity of an object is doubled, its kinetic energy is multiplied by
The charge of the Fe ion in the compound FeO is blank
The charge of the Fe ions in the compound Fe2O3 is
blank
Answer:
For Feo is 2+
For Fe2O3 is 3+
Btw I did it and got it right!
Explanation:
The charge of the Fe ion in the compound [tex]\rm FeO[/tex]is +2 and the charge of the Fe ions in the compound [tex]\rm Fe_2O_3[/tex] is +3, respectively.
Ion can defined as any atom or molecule having positive or negative charge on it.
In [tex]\rm FeO[/tex]: In the compound, oxygen is in group 16 and has a charge of -2, the iron ion must have a charge of +2 to balance the charges and make the compound neutral.
In [tex]\rm Fe_2O_3[/tex]: In the compound, oxygen is in group 16 and has a charge of -2, the three oxygen atoms in [tex]\rm Fe_2O_3[/tex] contribute to a total charge of -6. To make the compound neutral, the two iron ions must have a total charge of +6. Therefore, each iron ion must have a charge of +3 to balance the charges and make the compound neutral.
Therefore, Fe ion has a charge of +2 in the compound [tex]\rm FeO[/tex] and has a charge of +3 in the compound [tex]\rm Fe_2O_3[/tex].
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Help! 7th grade science!
When her lab partner takes out a graduated cylinder to pour a specific amount of liquid, Jocelyn reminds her to be careful for the curve at the top of the liquid. This curve is also known as the
A
stopper.
B
meniscus.
C
beam.
D
Erlenmeyer.
The curve in the given scenario is known as the meniscus. The correct option is B.
What is a graduated cylinder?A graduated cylinder, also known as a measuring cylinder or mixing cylinder, is a piece of laboratory equipment that is commonly used to measure the volume of a liquid.
It is narrow and cylindrical in shape. The amount of liquid measured is represented by each marked line on the graduated cylinder.
A graduated cylinder is a piece of laboratory equipment used to measure the volume of liquids, chemicals, or solutions during the course of a day's work in the lab.
Graduated cylinders provide greater precision and accuracy than standard laboratory flasks and beakers.
The upward or downward curve seen at the top of a liquid in a container is known as the meniscus.
Thus, the correct option is B.
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True or False: Electromagnetic waves are classified according to wavelength, or the distance between waves.
Answer: True
Explanation:
Write a balanced chemical equation for the decomposition of hydrogen peroxide (H2O2) into water and oxygen
Explanation:
Hydrogen peroxide (H2O2) when decomposes forms water and oxygen in a reaction as shown below
[tex]H_2O_2 \rightarrow H_2O + O_2[/tex]
However, this reaction is not completely balanced as number of oxygen atoms on reactant and product sides are not same
So, the complete balance equation looks like
[tex]2H_2O_2 \rightarrow 2H_2O + O_2[/tex]
What is the pH of 0.00765 KOH?
Which element is more reactive? *
Cs
Rb
Answer:
Rubidium is a typical but very reactive member of the series of alkali metals. It is appreciably more reactive than potassium, but less so than caesium, and so would be expected to react more violently with those materials that are hazardous with potassium or sodium.
Answer:
Rb is more reactive .
Rubidium is the second most reactive metal and is very soft, with a silvery-white lustre.
..................
the main source of nitrous oxide by humans is
Explanation:
Human activities such as agriculture, fuel combustion, wastewater management, and industrial processes are increasing the amount of N2O in the atmosphere. Nitrous oxide is also naturally present in the atmosphere as part of the Earth's nitrogen cycle, and has a variety of natural sources.
Organisms in the kingdom Fungi are often compared to plants. Choose ALL the characteristics that would differentiate fungi from plants.
Answer:
b and d
Explanation:
Fungi rely on other organisms for their nourishment whereas plants have chlorophyll and can manufacture it on their own. Therefore, there is large difference between plants and fungi.
What is fungi?The kingdom of fungi (plural: fungus) includes heterotrophic (unable to produce their own food) multicellular eukaryotic creatures that play significant roles in the nutrient cycle in ecosystems.
Fungi reproduce by spores, whereas plants reproduce via seeds and pollen. Plants have stems, leaves, and roots. Only the filaments that adhere to the host are found in fungi. In the eco system, plants are the producers, and fungus are the decomposers. Plant cell walls are composed of cellulose, whereas fungi's are composed of chitin.
Therefore, there is large difference between plants and fungi.
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name three pure elements and three pure compounds
Answer:
Pure elements:
Hydrogen(H)
Nitrogen(N)
Magnesium (Mg)
Pure Compounds:
Oxygen gas(O2)
Water (H2O)
Ammonia (NH3)
Explanation:
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A woman uses 330 Joules of energy to push a box across the floor in 33 seconds. What is her power output in Watts?
Answer:
10 watts
Explanation:
Power = Work / Time
Power = 330 J / 33 s
Power = 10 watts
how many electrons will be in the valence of non- H atoms when they make covalent bonds?
Answer:
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what is the ratio of aluminum chloride to lithium sulfate
A force of 25 newtons is exerted over an area of 50 square meters. Calculate
the pressure exerted in pascals.
Answer:
the pressure exerted in pascals is 0.5 Pa
Explanation:
The computation of the pressure exerted in pascals is shown below:
As we know that
Pressure = force ÷ area
= 25 ÷ 50
= 0.5 Pa
Hence, the pressure exerted in pascals is 0.5 Pa
We simply applied the above formula so that the correct pressure could come
Why is copper a good conductor of electricity?
A.
Copper atoms hold onto their electrons very tightly.
B.
Electrons can move easily between copper atoms.
C.
Copper atoms are bonded together in molecules.
D.
Copper atoms can flow quickly along a wire.
Answer:
B. Electrons can move easily between copper atoms.
Explanation:
why are chemical equations balanced? PLEASE HELP
Answer:
A to show that the mass of atoms in the product
Plz help, I will give brainliest.
Answer: The value of [tex]K_c[/tex] is 2
Explanation:
Moles of [tex]N_2O_4[/tex] = 1.0 mole
Volume of solution = 1.00 L
Initial concentration of [tex]N_2O_4[/tex] = [tex]\frac{1.0mol}{1.00L}=1.0M[/tex]
Equilibrium concentration of [tex]NO_2[/tex] = [tex]\frac{1.0mol}{1.00L}=1.0M[/tex]
The given balanced equilibrium reaction is,
[tex]N_2O_4(g)\rightleftharpoons 2NO_2(g)[/tex]
Initial conc. 1.0 M 0 M
At eqm. conc. (1.0-x) M (2x) M
The expression for equilibrium constant for this reaction will be,
[tex]K_c=\frac{[NO_2]^2}{[N_2O_4]}[/tex]
Given : 2x = 1.0
x= 0.5
Now put all the given values in this expression, we get :
[tex]K_c=\frac{(1.0)^2}{(1.0-0.5)}[/tex]
[tex]K_c=2[/tex]
Thus the value of [tex]K_c[/tex] is 2
An intravenous solution of mannitol is used as a diuretic to increase the loss of sodium and chloride by a patient. If a patient receives 30.0 mL of 25% (m/v) mannitol solution, how many grams of mannitol were given?
Answer:
Explanation:
25 % ( m / v ) mannitol solution means 25 gram in 100 cc of water
25 gram in 100 mL of water
grams of mannitol in 30 mL = 25 x 30 / 100
= 7.5 grams .
When combined, two gases have a pressure of 75.54 atm. If one has has a pressure of 2.90 atm, what is the pressure of the second gas?
Your answer must me rounded to the second decimal place. (Dalton's)
Answer:
The pressureof the secondone is 2.5 atm
Explanation:
hope this helps
Durante 50 s un cuerpo viaja a una velocidad de 18.5 m/s, ¿Qué distancia recorrió?
Answer:
Distancia = 925 metros.
Explanation:
Dados los siguientes datos;
Tiempo = 50 segundos
Velocidad = 18.5 m/s
Para encontrar la distancia recorrida;
Matemáticamente, la distancia viene dada por la fórmula;
[tex] Distancia = velocidad * tiempo [/tex]
Sustituyendo en la fórmula, tenemos;
[tex] Distancia = 18.5 * 50 [/tex]
Distancia = 925 m.
Por tanto, el cuerpo recorrió una distancia de 925 metros.
What is the lanthanide with least mass, periodic table?
Answer:
Europium/Eu ( not really sure )
The lanthanide element with the least mass is Lutetium (Lu)
Lutetium (Lu) is a member of the lanthanide series, which is a group of 15 elements located in the f-block of the periodic table. The lanthanide series starts with the element Lanthanum (La) and ends with Lutetium (Lu). Lutetium is the heaviest and most dense element in the lanthanide series. Lutetium has an atomic number of 71, indicating that it has 71 protons in its nucleus. It has a relatively high atomic mass of approximately 174.97 atomic mass units (u) according to the periodic table.
Hence, lutetium is the lanthanide element with the least mass.
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Given the equation: HCl + Na2SO4 → NaCl + H2SO4, if you start with 8 moles of hydrochloric acid, how many grams of sulfuric acid will be produced?
Answer:
392g sulfuric acid are produced
Explanation:
Based on the balanced equation:
2HCl + Na2SO4 → 2NaCl + H2SO4
2 moles of HCl produce 1 mole of sulfuric acid
To solve the problem we need to find the moles of sulfuric acid produced based on the chemical equation. Then, using its molar mass -Molar mass H2SO4 = 98g/mol- we can find the mass of sulfuric acid produced:
Moles sulfuric acid:
8mol HCl * (1mol H2SO4 / 2mol HCl) = 4 mol H2SO4
Mass sulfuric acid:
4mol H2SO4 * (98g / mol) =
392g sulfuric acid are produced