Answer:
the correct answer is Group of answer choices
Using models to understand objects and processes better is not part of every scientific investigation while collection of relevant empirical evidence,use of logical reasoning and devising hypothesis, making predictions is a part.
What is hypothesis?Hypothesis can be defined as an assumption which is made for the sake of argument . It is an interpretation of a practical condition for which action needs to be taken.It is defined as a tentative assumption which is made to test logical consequences.It is an antecedent clause of a statement which is conditional.
It is constructed before research. There are six types of hypothesis 1)simple hypothesis 2) complex hypothesis 3) directional hypothesis 4)non-directional hypothesis 5) null hypothesis 6)casual hypothesis
The hypothesis should be clear and precise, it must be specific and way of explanation of hypothesis should be simple.
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¡A que clasificación corresponden las sustancias que están formadas por un mismo tipo de átomos, es homogénea y no puede descomponerse por medios químicos?
Answer:
Elementos.
Explicación:
Los elementos son las sustancias puras que están formadas por el mismo tipo de átomos, es homogéneo y no se puede descomponer por medios químicos. El elemento tiene el mismo tipo de átomos que son similares en tamaño y forma. Es un tipo de materia pura que tiene solo un tipo de átomos y no se puede descomponer más porque no está hecha de dos sustancias, es solo una sustancia, por eso no se puede descomponer por medios químicos.
The half-life of strontium-90 is about 29 years. How many half-lives have elapsed when 6.25% of
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The question is incomplete, the complete question is;
The half-life of strontium-90 is about 29 years. How many half-lives have elapsed when 6.25% of a strontium- 90 sample remains in the container?
Answer:
4 half lives
Explanation:
From;
N/No = (1/2)^t/t1/2
N= amount of strontium-90 present at time t
No= amount of strontium-90 originally present
t= time taken
t1/2 = half life of strontium-90
But N= 0.0625No
Hence;
0.0625No/No = (1/2)^t/29
0.0625 = (1/2)^t/29
(1/2)^4 = (1/2)^t/29
4 = t/29
t = 4 × 29
t= 116 years
Hence four half lives have elapsed
El agua de una alberca requiere de 35.8 gramos de desinfectante (NaClO), por cada 1000 L de agua para mantenerse limpia. El día de hoy el cuidador de la alberca no fue a trabajar y dejó al velador encargado de la adición de desinfectante al agua, pero al velador se le olvidó la cantidad y le agregó 65 g.
Answer:
816L adicionales para mantener la concentración
Explanation:
Cuánta agua debe adicionar el cuidador para que se mantenga la concentración del desinfectante?
El desinfectante, NaClO, idealmente debe estar en una concentración de:
35.8g / 1000L = 0.0358g/L
Como el velador agregó 65g de desinfectante, la cantidad de agua necesaria es:
65g * (1L / 0.0358g) = 1816L de agua son necesarios
Asumiendo que el velador agregó 1000L, el cuidador debe agregar:
1816L - 1000L =
816L adicionales para mantener la concentraciónNewton’s Second Law of Motion: The Law of 1. __________(Inertia/Acceleration)
The acceleration of an object is 2. _____________ (directly/inversely)
proportional to the magnitude of the net force acting on it, in the
3. _____________ (same/opposite) direction as the net force, and
4. _____________ (directly/inversely) proportional to the
5. _____________ (mass/weight) of the object.
Answer:
acceleration
inversly
opposite
directly
mass
Which statement explains why catalysts are important for living
organisms? *
Catalysts increase the amount of product formed from limited reactants.
Catalysts cause gases to be produced at a slower rate, so cells don't burst.
Catalysts are used up during chemical reactions, so organisms must constantly make
new ones.
Catalysts allow chemical reactions to occur at temperatures at which the organism
lives.
Answer:
Catalysts allow chemical reactions to occur at temperatures at which the organism lives.
Explanation:
Catalysts are molecules that speeden the rate of chemical reaction by lowering the activation energy of the reaction. In a living system, the catalyst are ENZYMES, which help to hasten up many biochemical reactions.
Another function of catalyst in living systems is that it allows chemical reactions to occur at temperatures at which the organism lives.
The diagram below represents changes in the types of plants growing in the same area during four different time periods. Different types of plants
have been labeled for each time period.oo
Hardwood trees
Softwood trees
Small plants and
shrubs
Grasses
kanmummimaturday
Time
This change in plant types over time is an example of
Answer:
ecological succession
Explanation:
Answer:
ecological succession
Explanation:
I did this before
Struggling on this problem.
Answer:
4Al + 3O2 ----> 2Al2O3
Explanation:
first blank 4
second blank 3
third blank 2
Rank them from the smallest to the largest
electrons
protons
atom
compounds
mixtures
What is the term for the repeating pattern in a crystalline structure?
a) Repeating pattern
b) Base pattern
c) Unit cell
d) Primitive pattern
Answer:
Because a crystalline solid consists of repeating patterns of its components in three dimensions (a crystal lattice), we can represent the entire crystal by drawing the structure of the smallest identical units that, when stacked together, form the crystal. This basic repeating unit is called a unit cell.Aug 12, 2020
What is the pH of a solution with [H+] concentration of 1.86 x 10-5?
a.5.37 x 10-10
b.9.3
c.4.7
d.1.86 x 10-5
Answer:
4.7Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(1.8 \times {10}^{ - 5} ) \\ = 4.7447[/tex]
We have the final answer as
4.7Hope this helps you
Método científico: El trabajo científico se caracteriza por ser planificado, con objetivos iniciales y que habitualmente se dan en un cierto orden.1) Indica cuáles son los pasos del método científico explicando brevemente cada uno de ellos.2) Los siguientes son dos modelos : *Un estudiante pensando en la competencia, desarrolla un proyecto en el sótano de su casa. *Un grupo de personas con diferentes aptitudes cooperan para resolver un problema. ¿Cuál de ellos es mejor para el trabajo científico? ¿Por qué?
Answer:
Ver explicación
Explanation:
El método científico se refiere al patrón establecido de resolución de un problema científico. Los siguientes son pasos importantes en el método científico;
Haz una observación.
formular preguntas relevantes.
elabore una hipótesis que pueda ser probada.
Diseña un experimento.
Prueba la hipótesis usando tu diseño experimental.
Teniendo en cuenta ambos escenarios, el último caso en el que estudiantes de diferentes capacidades trabajan juntos para resolver un problema refleja mejor el método científico porque pueden hacerse preguntas entre sí y llegar a hipótesis comprobables que pueden demostrarse como verdaderas o falsas mediante experimentos.
What is the molarity if 60.4 grams of hydrochloric acid was added to 505 mL of water?
M
H - 1.0079 g/mol
Cl- 35.453 g/mol
Answer:
3.29 M
Explanation:
Molarity refers to the molar concentration of a solution and it can be calculated using the formula below:
Molarity (M) = number of moles (n) ÷ volume (V)
According to this question, the mass of HCl was given to be 60.4 grams and the volume of water as 505 mL.
Using mole = mass/molar mass to convert mass of HCl to moles
Molar mass of HCl = 1.0079 + 35.453 = 36.4609g/mol
mole = 60.4g ÷ 36.4609g/mol
mole = 1.66mol
Volume of water = 505mL = 505/1000 = 0.505L
Molarity, M = 1.66 ÷ 0.505
Molarity of HCl solution = 3.29 M
What is the uses of seawater as a source of renewable energy?
Explanation:
Desalination of seawater is considered a renewable source of water, although reducing its dependence on fossil fuel energy is needed for it to be fully renewable.
Balance the equation above please
Answer:
Balanced Equation:-Al2(CO3)3. ---heat---> Al2O3 + 3 CO2
Answer:
everything can be found in the picture
How many grams of NaOH are needed to make 250mL of a 0.1M NaOH solution?
Answer:
To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.
Explanation:
Your welcome! :)
Which of the following most likely happens when the volume of a gas increases the number of collisions of gas particles remains same. The number of collisions of gas particles increases. The pressure of the gas remains the same. The pressure of the gas decreases
Answer:
D. The pressure of the gas decreases!
Explanation:
According to Boyle's Law, there is an inverse relationship between the volume of a gas and its pressure!
So, if the volume of a gas increases, its pressure will decrease; the same thing will happen if the pressure of the gas increases -- the volume will decrease!
↑P↓V and ↓P↑V <---- this is what it would look like visually!!
Hope this helps! :)
When the volume of a gas increases then the pressure of the gas decreases.
What is ideal gas equation?Ideal gas equation is a hypothesis which tells about the behavior of gas in different conditions and it will be represented as:
PV = nRT
From this equation it is clear that pressure and volume are inversely proportional to each other:
P ∝ 1/V
Means if pressure increases ten volume decreases or if pressure decreases then volume increases.
Hence option (4) is correct.
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_______ reach the surface first during an earthquake.
Rayleigh waves
P waves
Love waves
S waves
Make a flow chart on uses of metals and non metals
you have to make flow chart with explanation
Answer:
Metals:
1. Metals are strong than non metals
2. Metals can be formed in wires, thin sheets, utensils and any other heavy meachinary for industries.
3. Metals are used for building construction and used in many other manufacturers
Non Metals:
1. Non metals are less stronger than metals.
2. Non metals can be used for manufacturing bottles, toys, bags, files etc.
3. Non metals are used in making of bottles, jars, chairs etc.
Thank you.....
Have a good day.....
I would appreciate some help please ᕕ( ᐛ )ᕗ
3KOH + FeCl3 → Fe(OH)3 + 3KCl
How many grams of KOH are needed to produce 0.500 moles of KCl?
Answer:
dont know, will let uk in 2 mins
Explanation:
Explanation:
hope this helps you to understand:)
I. Witch direction does the electric field point at a position directly west of a positive charge
Answer:
The answer is North
Explanation:
The direction of the field is taken to be the direction of the force it would exert on a positive test charge.
Aqueous sulfurous acid decomposes into sulfur dioxide gas and liquid water. Write a chemical equation for this reaction.
Answer:When trying to concentrate the solution by evaporation to produce waterless sulfurous acid it will decompose
Explanation:
Explanation:
here's the answer to your question
On a graph showing distance versus time, a horizontal line represents an object that is
moving at a constant speed.
increasing its speed.
decreasing its speed.
not moving at all.
Answer:
the anwser is; B: increasing its speed
Which of the following has kinetic energy?
Answer:
c ) a gymnast doing a cartwheel. ........
hope you like ☺️
Which will boil faster distilled water or salt water and why?
Answer:
The distilled water will be boiled faster as it does not contain any non - volatile solute.
- The salty water contains different non - volatile salts in it.
- Due to the presence of these salts, its vapour pressure will be decreased and boiling point will be elevated.
- So, salty water will take more time to boil.
- On the other hand, distilled water does not have any such solute and due to this its vapour pressure will not be affected.
- Hence, it will boil fast than salty water.
You are a NASCAR pit crew member. Your employer is leading the race with 20 laps to go. He just finished a pit stop and has 5.0 gallons of fuel in the tank. On the way out of the pits, he asks, "Am I going to have enough fuel to finish the race or am I going to have to make another pit stop?" You whip out your calculator and begin your calculations based on your knowledge of stoichiometry. Other information you know is: The car uses an average of 300.0 grams of O2 for each lap. The formula for fuel is C5H12. The fuel has a density of 700 g/gal. What do you tell the driver? (The density can be used as a conversion factor between grams and gallons)
Answer:
Since there are 3500 g of fuel left in the tank, and he needs only 1687.5 g to complete 20 laps, he has enough fuel to complete the race. I will tell the driver that he does not need to make another pit stop as he has enough fuel to complete the race.
Explanation:
Density = mass / volume
Density of fuel = 700 g/ 1 gal
Therefore, the mass of fuel in 1 gallon = 700 g
The driver has 5.0 gallons of fuel in the tank.
The mass of 5.0 gallons of fuel = 5 × 700 = 3500 g of fuel
Equation of the combustion of fuel, C₅H₁₂ is given below:
C₅H₁₂ + 8 O₂ ---> 6 H₂O + 5 CO₂
1 mole C₅H₁₂ requires 8 moles of O₂
1 mole of C₅H₁₂ has a mass = 72 g
8 moles of O₂ has a mass = 256 g
Therefore, 300 g of O₂ will require 300 × (72/256) g of C₅H₁₂ = 84.375 g of C₅H₁₂
84.375 g of fuel is used by the car per lap;
20 laps will require 20 × 84.375 g of fuel = 1687.5 g of fuel.
Since there are 3500 g of fuel left in the tank, and he needs only 1687.5 g to complete 20 laps, he has enough fuel to complete the race. I will tell the driver that he does not need to make another pit stop as he has enough fuel to complete the race.
the PH of a solution with a [H+] of 1x10^9 is ?
Answer:
9
Explanation:
pH = -log[H+] = -log(1x10^9) = 9
303.8 liters volume will be occupied by 217.0 grams of methane gas at STP.
True
False
Answer:
False
Explanation:
It will occupy 271.7
Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points
Answer:
chlorine is larger so the symbol is <
Explanation:
URGENT !!!
Which of the following pairs lists a substance that can neutralize Ca(OH)2 and the salt that would be produced from the reaction? (3 points)
HCl and CaCl2
HClO and CaHClO
H2O and Ca(OH)3
H3PO4 and Ca(PO3)2
HCl and CaCl2
I took the test and it wright
The correct pair that lists a substance that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt that would be produced from the reaction is HCl and [tex]\rm CaCl_2[/tex].
A reaction is a process that involves the transformation of one or more substances into one or more different substances.
When HCl (hydrochloric acid) reacts with [tex]\rm Ca(OH)_2[/tex] (calcium hydroxide), they undergo a neutralization reaction. The HCl donates a hydrogen ion ([tex]\rm H^+[/tex]) to the [tex]\rm Ca(OH)_2[/tex], resulting in the formation of water ([tex]\rm H_2O[/tex]) and [tex]\rm CaCl_2[/tex] (calcium chloride).
The reaction can be represented as follows:
[tex]\rm 2HCl + Ca(OH)_2\rightarrow 2H_2O + CaCl_2[/tex]
Therefore, HCl is an acid that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt produced from this reaction is [tex]\rm CaCl_2[/tex].
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