The solution of copper sulfate was too cold
Explanation:
The lack of an observable reaction when adding a zinc strip to a copper sulfate solution could be due to the zinc not being reactive enough, the reaction occurring too slowly, or an experimental error.
What is the lack of an observable reaction?The lack of an observable reaction refers to a situation where no visible or measurable change occurs when two or more substances are mixed or brought into contact with each other, even though a reaction was expected based on the chemical properties of the substances involved.
Here in the Question,
The lack of an observable reaction when Alannah added a strip of zinc to a beaker containing a solution of copper sulfate could be due to the following reasons:
Zinc and copper sulfate do not react: It is possible that the zinc strip and copper sulfate solution do not react with each other, leading to no observable change. This could occur if the zinc strip is not reactive enough to displace the copper in the copper sulfate solution.
Reaction is slow: Another possibility is that the reaction between zinc and copper sulfate is occurring but is happening too slowly to be observed. In this case, the reaction rate may be too low to produce an observable amount of solid copper in the beaker in a short period of time.
Experimental error: It is also possible that an error was made during the experiment that prevented the expected reaction from occurring. For example, the concentration of the copper sulfate solution may have been too low, or the zinc strip may have been coated with a layer of oxide that prevented it from reacting with the solution.
Therefore, Zinc may not be sufficiently reactive, the reaction may proceed too slowly, or there may have been a mistake in the experiment if there was no detectable reaction when a zinc strip was added to a copper sulphate solution.
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Do energy drinks actually provide energy?
Answer:
Most energy drinks contain large amounts of caffeine, which can provide a temporary energy boost. Some energy drinks contain sugar and other substances. The boost is short-lived, however, and may be accompanied by other problems.
Explanation:
Answer:
kinda
Explanation:
Most energy drinks contain large amounts of caffeine, which can provide a temporary energy boost. Some energy drinks contain sugar and other substances. The boost is short-lived, however, and may be accompanied by other problems.
An incident light ray hits a plane surface at 20 degrees (hint: remember where the angle is measured from). What is the angle between the incident and reflected rays? So is it 20 degrees or 40 degrees
Answer:
[tex]40^{\circ}[/tex]
Explanation:
The incident angle is [tex]20^{\circ}[/tex] so the reflected ray will also be [tex]20^{\circ}[/tex].
The normal divides the angle between the incident and reflected ray. So, the angle between them would be
[tex]\text{Incident angle}+\text{Reflected angle}=20+20=40^{\circ}[/tex]
So, the angle between the incident and reflected rays is [tex]40^{\circ}[/tex].
If it takes 3.5 hours for a train to travel between two cities at a velocity of 120 miles/hr, what is the distance between the two cities?
Answer:
120 mph is 193.1 km/hrs.
distance is s = vt.
193.1*3.5 = 675.85 km
Answer:
420 miles
Explanation:
Time: 3.5 hrs
Velocity: 120 miles/hr
Now Distance= Speed × Time
Distance = 3.5 × 120 = 420 miles
which describes an object in projectile motion
Answer:
Gravity acts to push the object sideways
Explanation:
projectile motion is a motion that moves along a curved path under the action of gravity only. Hope this helps!
An object's speed is 0.8 m/s, and its momentum is 200 kg-m/s What is the mass of the object?
A. 250kg
B. 200kg
C.160kg
D.128kg
Answer:
A: The mass would be 250kg
Explanation:
In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object. where m is the mass and v is the velocity. The equation illustrates that momentum is directly proportional to an object's mass and directly proportional to the object's velocity.
p= mv
m= p/ v
The explanation to that is:
momentum = mass× velocity
mass= momentum / velocity
THE ANSWER IS A
Hope this helps!
The diagram shows a skydiver at different points of her jump. At what point would her
acceleration be greatest?
A.
B.
C.
D.
(FOR SCIENCE)fill in the blank with the words ok the top!!!!!
Fill in the blanks to complete each statement about energy in Earth’s crust. (use lower case wording only)
Plate movements on Earth’s crust create
.
This adds energy to the crust, which then bends and breaks, forming
.
Answer:
stress and fault
Explanation:
yes
Answer:
Stress for the first one and the second faults
Explanation:
Brainliest for correct answer :)
Answer:
The weight of an average person on the Earth is 80kg
but in the picture it shows that the person weight 120 kg
Please mark as brainliest if answer right
Have a great day, be safe and healthy
Thank u
XD
Answer:
the weight is 1200 newtons since 1 Kg is equal to 10 Newtons
Which is the right answer
A
B
C or
D
Answer:
B
Explanation:
Density=mass/volume
Density=8.5g/17mL
Density=0.5 g/mL
An object has a mass of 8.5 g and a volume of 17 mL, then the density will be 0.5 g/mL. The correct option is b.
The density of matter is a physical quantity that indicates how much mass is contained within a particular volume.
It is defined as a substance's mass per unit volume. In other words, density quantifies how tightly packed a substance's particles are.
We know that:
Density = Mass / Volume
Density = 8.5 g / 17 mL
Simplifying the calculation:
Density = 0.5 g/mL
Therefore, the density of the object is 0.5 g/mL. So, the correct answer is option b. 0.5 g/mL.
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physical sciences march test New towns law and
Answer:
What are you asking
Explanation:
Answer:
What are you asking write I don't understand
At the center, 6 unmarked red balls are interspersed with 4 blue balls marked with plus signs. A green cloud with 2 concentric white lines surrounds the center, with 2 small green balls marked with minus signs on the inner white line and 2 small green balls marked with minus signs on the outer white line. How many neutrons does this atom have? 4 6 10 14
Answer:
10
Explanation:
Amu denotes for unified atomic mass.
it is mostly used to define the atom's mass and molecules.
we know that
One unit of amu is 1 ÷ 12 of the mass of a nuclide 12C
And 1 u = 1.660 538 921 × 10-27 kg
In the inside we can found that there is 10 nucleons so here the alss of the atoms would be 10 amu
Answer:
guy above me is right
Explanation:
What is related to the force that causes electric charges to flow.uses answers below
Answer:
Im going to say voltage. It matches with my notes but it says voltage difference so i hope this helps!
Explanation:
How much heat is required to raise 100 grams of water (c= 4.18) by 5 degrees Celsius?
Answer:
Heat capacity, Q = 2090 Joules.
Explanation:
Given the following data;
Mass = 100 grams
Specific heat capacity = 4.18 J/g°C.
Temperature = 5°C
To find the quantity of heat required;
Heat capacity is given by the formula;
[tex] Q = mct[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
t represents the temperature of an object.
Substituting into the formula, we have;
[tex] Q = 100*4.18*5 [/tex]
Heat capacity, Q = 2090 Joules.
Which motions are the components of projectile motion? A and B B and C A and C None of these are correct combinations.
Answer:
its A and B
Explanation:
Answer:
A or A and B
Explanation:
correct on edge 2021
The Doppler Effect for sound occurs when:
a) the speed of the wave changes
b) the height of the wave changes
c) the distance between the waves change
d)the moving object decreases in speed
What would happen if you combine vinegar with baking soda (NaHCO3), which gives off OH– ions in water, and why? What kind of substances would be produced? (This is middle school not high school)
Answer:
Explanation:
When vinegar and baking soda are first mixed together, hydrogen ions in the vinegar react with the sodium and bicarbonate ions in the baking soda. The result of this initial reaction is two new chemicals: carbonic acid and sodium acetate. The second reaction is a decomposition reaction.
Kyle and Jenny both have pet rabbits. They wanted to see who had the fastest rabbit, so they each recorded data at their homes and brought it's the results. Kyle rabbit went a total of 40 m in a time of one minute and 20 seconds. Jenny's rabbit went 30 m in one minute and 30 seconds. What was the velocity of Kyle's rabbit? What was the velocity of jennies rabbit? Whose rabbit was the fastest?
Answer:
v_kyle = 0.5 m/s
v_jennies = 0.333 m/s
Kyle's Rabbit was the fastest
Explanation:
For the velocity of Kyle's Rabbit:
d = distance covered = 40 m
t = time taken = (1 min)(60s/1 min) + 20 s = 80 s
[tex]v_{kyle} = \frac{d}{t} = \frac{40\ m}{80\ s}[/tex]
v_kyle = 0.5 m/s
For the velocity of Jennies Rabbit:
d = distance covered = 30 m
t = time taken = (1 min)(60s/1 min) + 30 s = 90 s
[tex]v_{jennies} = \frac{d}{t} = \frac{30\ m}{90\ s}[/tex]
v_jennies = 0.333 m/s
It is clear from the results that:
Kyle's Rabbit was the fastest
A new piece of exercise equipment has been added to your gym, and you try it out. To use this machine, you lie horizontal on a mat with your feet against a platform perpendicular to the mat. The platform is held by a stiff spring that is compressed when the platform moves. Your workout invovles compressing the spring by pushing on the platform with your feet. After testing compressions of the equipment, you determine that you must do 85.0 J of work to compress the spring a distance 0.170 m from its uncompressed length.What magnitude of force must you apply to hold the platform stationary at the final distance given above
Answer:
500 N
Explanation:
Since the work done on the spring W = Fx where F = force applied and x = compression length = 0.170 m (since the spring will be compressed its full length when the force is applied)
Since W = 85.0 J and we need to find F,
F = W/x
= 85.0 J/0.170 m
= 500 N
So, the magnitude of force must you apply to hold the platform stationary at the final distance given above is 500 N.
This type of soil is found in warm, humid climates. Question 4 options: pedocal laterite pedalfer humus
Answer:
Laterite is your correct answer
Explanation:
Well i took the quiz and made a %100 meaning i am correct.
The laterite soil is found in warm, humid climates
What are Laterite soil?A variety of rocks weathered under highly oxidising and leaching circumstances to form laterite soil, which is present in the soil layer and is rich in iron oxide.
Given data ,
Let the soil be represented as A
Now , the soil is found in warm, humid climates
The laterite soil is is rich in iron and aluminium, are assumed to have developed in hot, humid tropical climes. Because to the substantial concentration of iron oxide, nearly all laterites have a rusty-red colour.
They develop as a result of prolonged, intensive erosion of the underlying rock material, which most frequently takes place during periods of high temperatures and heavy precipitation that alternate with periods of dry weather.
Hence , Laterite is the type of soil is found in warm, humid climates.
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When air warm up the air molecules move slower?
The gravitational force between two bodies is 250N . What will the new force be if one of the masses is tripled?
If one of the masses is tripled, then their product is tripled, and the force between them is tripled. The new force is 750N .
Momentum is mass times velocity, so another way to think of momentum is ____ in motion.
inertia
weight
acceleration
velocity
Answer: inertia
i don't know just want points .-.
sorry
The wave above has a wavelength of 6.25 meters and a frequency of 5 hertz. Calculate the speed.
Answer:
Wave Speed (m/s)
31.25
Summary
Wavelength (m)6.25
Frequency (hz)5
Explanation:
https://calculator.academy/wave-speed-calculator/#f1p1
Your teacher gives you an envelope that contains the following items: ● 20 red paper circles labeled with a “+” symbol to indicate they represent protons ● 20 blue paper circles with no label to indicate they represent neutrons ● 20 yellow paper circles labeled with the “-“ symbol to indicate they represent electrons Your teacher then challenges you to use the items in the envelope to create a model of a carbon-14 atom. Before you begin, you and your group brainstorm ideas for creating your model. Your group suggests the following steps: Step Procedure 1 use 6 red circles for the nucleus of the atom 2 use 14 red circles for the nucleus of the atom 3 add 6 blue circles to the nucleus of the atom 4 add 8 blue circles to the nucleus of the atom 5 place 14 yellow circles around the nucleus of the atom 6 place 6 yellow circles around the nucleus of the atom Which of the following steps should you follow to create a correct model of a Carbon-14 atom? A. steps 2, 3, 6 B. steps 2, 4, 5 C. steps 1, 4, 6 D. steps 1, 3, 5
Answer: C
Explanation: I did the test
We need to use 6 red circles and 8 blue circles to represent the 6 protons and 8 neutrons in the nucleus. Then, we need to place 6 yellow circles around the nucleus to represent the 6 electrons in the atom. Option C is correct.
How to create a Carbon-14 atom?To create a correct model of a Carbon-14 atom, we need to follow the steps that represent the correct number of protons, neutrons, and electrons in a carbon-14 atom.
Carbon-14 has 6 protons and 8 neutrons, so we need to use a total of 6 red and 8 blue circles in the nucleus. It also has 6 electrons, so we need to place 6 yellow circles around the nucleus.
The correct steps to follow to create a model of a Carbon-14 atom are:
B. steps 1, 4, 6
Step 1: Use 6 red circles for the nucleus of the atom
Step 4: Add 8 blue circles to the nucleus of the atom
Step 6: Place 6 yellow circles around the nucleus of the atom
Therefore, we need to use 6 red circles and 8 blue circles to represent the 6 protons and 8 neutrons in the nucleus. Then, we need to place 6 yellow circles around the nucleus to represent the 6 electrons in the atom.
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Q: You're playing a game of catch with a dog, the dog is initially standing near your feet. Then he jogs 20ft in a straight line to retrieve the stick and carries the stick 15ft back towards you before lying on the ground to chew the stick.
A). Cal the total distance
B) . Total displacement
C). Show that the net displacement of the trip is the sum of the sequential displacement that makes up the trip.
Answer:
A) 35 ft
B) 5 ft
C) Net displacement = distance covered by the dog to retrieve the stick - distance covered before the dog starts chewing the stick
Explanation:
A) Total distance covered by the dog = 20 + 15
= 35 ft
B) Since the other distance covered by the dog before chewing the stick, after the retrieval, was in an opposite direction to the initial direction, then;
total displacement of the dog = 20 - 15
= 5 ft
C) Net displacement = distance covered by the dog to retrieve the stick + distance covered before the dog starts chewing the stick
But, displacement involves a specified direction. The distance covered before the dog starts chewing the stick was in an opposite direction to the initial direction.
Thus,
Net displacement = distance covered by the dog to retrieve the stick - distance covered before the dog starts chewing the stick
Un auto de 1000 kg que lleva una velocidad de 72 km/h se detiene en una distancia de 100 metros cuando se le aplican los frenos. (a) ¿Cuál es la fuerza constante producida por los fre. Nos? (b) Con esta fuerza, ¿cuál seria la distancia de frena do si la velocidad hubiera sido de 36 km/h?
Answer:
a) F = 2000 N , B) x = 25 m
Explanation:
a) To solve this exercise we can use the relationship between work and kinetic energy
W = ΔK
The job is
W = -F x
the negative sign is because the force of the brakes is contrary to the movement
as the car stops its final kinetic energy is zero
K = ½ m v²
let's substitute
- F x = 0 - ½ m v²
F = ½ m v² / x
Let's reduce the magnitudes to the SI system
v = 72 km / h (1000m / 1km) (1 h / 3600 s) = 20 m / s
let's calculate
F = ½ 1000 20²/100
F = 2000 N
b) x = ½ mv2 / F
let's slow down to the SI system
v = 36 km / h = 10 m / s
let's calculate
x = ½ 1000 10²/2000
x = 25 m
Hey guys, can you please help me with this question?
A rectangular container of base 50 cm by 30 cm is filled with water to a depth of 5 cm. How much is the pressure exerted at the base? (Take p= 1000 kg/m3 and g=10m/s)
Answer:
the pressure exerted at the base of the container is 490 N/m²
Explanation:
Given;
density of water, ρ = 1,000 kg/m³
base of the rectangular container, = 50 cm by 30 cm
height of water in the tank, h = 5 cm = 0.05 m
The pressure exerted at the base of the container is calculated as;
P = ρgh
where;
g is acceleration due to gravity = 9.8 m/s²
P = 1000 x 9.8 x 0.05
P = 490 N/m²
Therefore, the pressure exerted at the base of the container is 490 N/m²
A hot iron ball of mass 200 g is cooled to a temperature of 22°C from 100°C. How much heat was
lost in the process?
(Ciron = 0.444 J/g°C)
Q =mcAT
Answer:
Q= -6900 J
Explanation:
use the formula Q=mC(T_2 - T_1) and sub in givens
Q=mC(T_2 - T_1)
Q= (200 g)(0.444 J/g°C)(22-100)
Q= -6900 J
The negative sign means heat is lost, which agrees with the decrease in temperature
A beta particle emitter is Cobalt - 60. Cobalt - 60 decays to Nickel in an exited state.
Then gamma rays are emitted to bring Nickel to its ground state.
Discuss how you would use a Beta-particle source to investigate the penetration limits of beta-particles in the laboratory.
Which of these two sources, strontium-90 or cobalt-60, would be more suitable to
use for the penetration experiment above. Justify your answer.
Answer:
Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.
Explanation:
We study the various atomic models in our course of study because, it is important for us to know, how did people come to the present concept of an atom. How did physics evolve from classical to quantum physics.
All these are important for us to know and thus, knowledge about various atomic models, their discoveries and drawbacks and finally improvements based on scientific evidence present at that time is important for us to understand the underlying theory very well.