Answer:
d
Explanation:
A: mass never increases or decreases. It is a value that is the same everywhere in the universe. A is not correct.
B: it can be but that is not the only unit that can be used
C: A spring scale measures force not mass.
D: The answer to this question is D if the word at the end is balance.
How do the densities of the two objects compare?
What is limitation of using marbles as models for atoms
Explanation:
I think it really depends on what you are using them for but I would say in general that using marbles means you can't investigate the subatomic particles (electron orbitals, nucleus etc.) and also you can't exactly model atomic binding with marbles as they don't really stick together.
I would say those are the two main things but once again really depends on what they're being used for.
Hope this helped!
A sample of water fills a graduated cylinder 63 ml. How much space would this water occupy in dm3
Given :
Volume of water , V = 63 ml .
To Find :
The volume of the water in [tex]dm^3[/tex] .
Solution :
We know , 1 ml of water is equal to [tex]1 \ cm^3[/tex] .
So , 63 ml of water is :
[tex]V=63 \ cm^3[/tex] .... equation 1 .
Now , 1 cm = 0.1 dm
Putting value of 1 cm in equation 1 .
We get ,
[tex]V=63\times (0.1\ dm)^3\\V=63\times 10^{-3}\ dm^3\\V=6.3\times 10^{-2}\ dm^3[/tex]
Therefore , the volume of 63 ml water in [tex]dm^3[/tex] is [tex]6.3\times 10^{-2}\ dm^3[/tex] .
Hence , this is the required solution .
Can anyone give me examples of control groups ?
Answer:
In an experiment in which blood pressure medication is tested, one group is given the blood pressure medication while the control group is given a placebo pill.
In a test of anxiety treatment, one group attends individual therapy sessions and receives a new medication. The control group receives only an inert pill.
A treatment for drug addiction is being tested. A group of meth addicts are given the treatment while the control group is given the placebo.
Researchers are testing the effectiveness of a drug intended to reduce symptoms of Crohn's disease. Many sufferers of Crohn's disease are recruited for the effort and the group that receives the placebo is the control group.
A treatment for hair loss in men is being tested. Men of the same age range are gathered. One group receives an application with the active ingredient while the control group receives an application that appears the same but does not have the active ingredient in it.
hope this helped you
is marble a compound or element?
Answer:
compound
Explanation:
"Marble is typically more than 95% calcium carbonate, perhaps even 99% calcium carbonate, and calcium carbonate is a compound. Marble has a good claim to be recognized as a compound."
Answer: Element
Explanation: No, marble is not a compound, because for a rock to be called marble other characteristics, beyond the chemical composition, have to have specific values. But marble is made up of only one compound, calcium carbonate. Colored marbles do contain small amounts of other chemicals.
What does intrinsic mean in science
An intrinsic property is independent of how much of a material is present and is independent of the form of the material, one large piece or a collection of small particles. Intrinsic properties are dependent mainly on the fundamental chemical composition and structure of the material.
Which example is NOT a model?
A)
foam planets
B)
plastic skeleton
atom made of fruit
D
skin cells**
Answer:
B
Explanation:
i think leter B it because
When the problem within the story gets more intense and builds, this is the... Select one: climax. falling action. rising action. resolution.
Answer:
rising action.
Explanation:
Rising action is a term used in literature to describe the corresponding portion of the story, that occurs immediately before the climax, by increasing its atmosphere or builds-up whereby the tension level surges.
Climax, on the other hand, is a form of the highest point major turning point in a story.
While falling action is the point where there is a quick decrease in tension level, and follows immediately after the climax
Resolution is also known as the final part of the story, it follows immediately after falling action.
Hence, when the problem within the story gets more intense and builds, this is the "Rising Action."
“STEPS TO BE TAKEN TO REDUCE FUEL CONSUMPTION AT HOME
Drive only when needed. The best way to reduce the fuel consumption is to simply drive your car less. Drive your car only when you really need to. If you only need to travel a few blocks, consider walking or even riding a bicycle. Not only will you save money at the pump, the exercise will certainly do you some good
Make sure the gas cap is on tight. One reason you may not be getting the mileage you expect is because there isn't as much gas in your tank as you think. 147 million gallons of gas were lost last year due to evaporation. Why did it evaporate? The gas cap was not on tight. So just make sure it is tight, and it will enable you to keep all the gas you pay for
Avoid idling. When you do need to drive your car, make sure you avoid idling whenever possible. When your car is running, but not moving, your gas mileage is absolute zero. So if your car will remain stationary for more than a minute or so, switch the engine off. However, only do this when it is safe to do so
Accelerate and break steadily. While driving, always apply steady and consistent pressure to your car's accelerator pedal. A heavy foot will always result in reduced gas mileage and poor fuel consumption
Drive the speed limit. Always try to drive at or near the speed limit. The optimal traveling speed for every make and model vehicle is different. However, the faster you drive, the worse your gas mileage and fuel consumption will be. Drive as fast as you need to in order to maintain a safe driving speed. But, save highway driving speeds for the highway and not around town
Coast when possible. Constantly accelerating and braking only wastes fuel and reduces your car's fuel consumption. So, whenever possible, coast and avoid burning excess fuel. This takes a little practice, but can be a great way to increase the fuel economy of your vehicle
Use cruise control on the highways. Cruise control means that your car will be going at a constant velocity, which means there is no acceleration. No acceleration reduces the amount of work your engine does, and therefore it uses less gas. You should set your cruise control at the speed limit, because 55 miles per hour is the perfect speed for maximum fuel efficiency
Make your car more aerodynamic. You can do so by removing the roof racks on top of the car, and also by decreasing the weight of the car by taking out unneeded items
Keep the windows closed. The more aerodynamic your vehicle remains, the better your car's fuel efficiency. Keeping your windows down while driving creates more drag and wind resistance for your automobile. If you are driving at speeds of less than 35 mph, it is usually okay to keep the windows down. However, at higher speeds, you should keep the windows up order to reduce drag and improve fuel consumption
Minimize air conditioning. There will be times, of course, when summer heat will cause you to use the air conditioning system. However, use the AC in moderation. If you need to choose between keeping your windows rolled down or using the AC at high speeds, use the air conditioning on a low setting
Replace dirty air filters. Dirty air filters cause your car's engine to work much harder than it has to and always results in poor fuel economy. So, make sure you follow the manufacturer's recommendation for periodically changing out the air filter. A clean air filter allows your engine to perform more efficiently and also helps you save money at the pump
Maintain proper tire inflation. Check your car owner's manual and always ensure your tires are inflated to the proper air pressure level. Improperly inflated tires can reduce your car's fuel economy by up to five percent in some cases. This is quite simply a complete waste of fuel and money
Reduce weight in the vehicle. Get rid of any unnecessary items in your car's trunk or other areas of the vehicle. For every 100 pounds of weight in the vehicle, your car's fuel economy decreases by about one or two percent. By making sure your vehicle remains as light as possible, you can improve the fuel consumption of your vehicle and save money on your fuel bill
Sorry it's really long :P but hope this helped
Four properties of water are listed. It reacts with halogens to form oxygen gas as one of the products. It is transparent and tasteless in its pure form. It freezes at a temperature of 0 °C and lower. It decomposes to form hydrogen and oxygen. Which are the chemical properties of water?
Answer:
1 and 4 took the test
Explanation:
What are the 3 types of zeros?
can you determine the contents of the unlabeled jar through observation alone?
Answer:
This question appears incomplete but generally the answer is NO
Explanation:
Observation of the contents of an unlabeled jar depends solely on some of the physical properties of the content which is not good enough when identifying the contents of an unlabeled jar. This is because several substances have the same physical properties. For example, water and several acidic solutions appear the same in terms of colour and viscosity. Hence, a jar of water and a jar of hydrochloric acid cannot be differentiated by mere observation but with the use of litmus paper.
And a solution of hydrochloric acid and sulphuric acid cannot be differentiated by observation alone except a jar ammonia is brought close to the two jars (the one with hydrochloric acid will form a white fume with ammonia); hence relying on the chemical properties of both substances.
NOTE: Observation is done through sight, smell, feel, sound and taste without relying on another procedure/analysis to determine them.
1. In which state of matter can the particles move fast freely? 2. In which state of matter are the particles closet together? 3. Sketch a simple diagram to compare the arrangement of the particles in 1 and 2.
Answer:
1. The particles move freely in gaseous forms.
2. They are closest in the solid form.
3 SOLID
- They are very closed with each other and are mostly non-living things and hard things.
-They are very hard to break
-Examples Table, chair etc
Gaseous
-They are very freely and are not packed
-They are mostly in gas and are in many forms.
- Examples : Hydrogen, Oxygen etc
The image shows particles of salt dissolved in water.
How will the arrangement of salt particles most likely
change?
Salt particles will move toward the left through
diffusion.
Salt particles will move toward the left through active
transport.
Salt particles will move toward the right through
diffusion.
O Salt particles will move toward the right through active HELP PLEASE IM TIMEd!!!
transport.
Answer:
left through diffusion!
Explanation:
Salt particles will diffuse and towards where it is less.
Answer:
left through diffusion
Explanation:
An irregularly-shaped sample of aluminum (Al) is put on a balance and found to have a mass of 25.7 g. The student decides to use the water-displacement method to find the volume. The initial volume reading is 35.5 mL and, after the Al sample is added, the water level has risen to 41.7 mL. Find the density of the Al sample in g/mL. *
Answer:
4.14516129 g/mL
Explanation:
The density can be found with the following formula.
[tex]d= \frac{m}{v}[/tex]
where [tex]m[/tex] is the mass and [tex]v[/tex] is the volume.
We know the mass is 25.7 grams. We must find the volume.
The volume is equal to the volume of water that is displaced. Subtract the initial volume from the final volume.
⇒ final volume - initial volume
The initial volume is 35.5 mL and the final volume is 41.7 mL.
⇒ 41.7 mL - 35.5 mL
⇒ 6.2 mL
The volume of the aluminum piece is 6.2 mL.
Now we know the mass and the volume.
[tex]m= 25.7 g\\v=6.2 mL[/tex]
Substitute the values into the formula.
[tex]d=\frac{m}{v}[/tex]
[tex]d=\frac{25.7 g}{6.2 mL}[/tex]
[tex]d=4.14516129 g/mL[/tex]
The density of the aluminum sample is 4.14516129 g/mL
What Is Matter? Someone help me plzzz
Answer:
matter is anything with mass and volume
What is Heat?
Can someone answer this for me?
Which statement describes the relationship between thermal energy and particle movement?
Answer: The options are not given, here are the options.
A)There is an indirect relationship: as thermal energy increases, there is more particle movement.
B) There is an indirect relationship: as thermal energy increases, there is less particle movement.
c) There is a direct relationship: as thermal energy increases, there is more particle movement.*****
d) There is a direct relationship: as thermal energy increases, there is less particle movement.
The correct option is C.
There is a direct relationship: as thermal energy increases, there is more particle movement.*****
Explanation:
There is a direct relationship: as thermal energy increases, there is more particle movement because when there is increase in thermal energy or heat in a substance, the particles start to vibrate and move faster as a result of the particles gaining kinetic energy which is as a result of increased collision and diffussion rates.
As they vibrate the space between the particles increases which result in increase in motion or movement of the particle
7. A gas has a volume of 300 mL at 300 mm Hg. What will its volume be if the pressure is changed to 500 mm Hg?
Answer:
The volume is
180 mLExplanation:
In order to solve for the volume we use the formula for Boyle's law which is
[tex]P _{1} V _{1} = P _{2}V _{2}[/tex]where
P1 is the initial pressure
V1 is the initial volume
P2 is the final pressure
V2 is the final volume
Since we are finding the final volume we are finding V2
Making V2 the subject we have
[tex]V _{2} = \frac{P _{1} V _{1}}{P _{2} } [/tex]From the question
P1 = 300 mmHg
V1 = 300 mL
P2 = 500 mmHg
Substitute the values into the above formula and solve for the final volume obtained
That's
[tex]V _{2} = \frac{300 \times 300}{500} \\ = \frac{90000}{500} \\ = \frac{900}{5} [/tex]We have the final answer as
180 mLHope this helps you
What is the mass of 500ml of water, in grams, if the density of water is 1g/ml?
Answer:
309 /1000
Explanation:
Answer:
498
Explanation:
This questions has been a headaching me for a while. Please if anyone knows this answers?!
Answer:
1
Explanation:
1 represents the element, Hydrogen
It has 1 shell/electron
Because hydrogen has only the one electron/shell, it can also lose that electron/shell to form a completely empty n = 1 shell.
The main factor which effects the speed of a sound wave is the ____
Answer:
it depends on the medium and the temperature
Explanation:
The speed of the sound wave has been majorly dependent on temperature and medium of propagation.
Speed can be defined as the distance traveled by the wave in a unit of time. The speed is a scalar quantity and has been independent of the direction.
The speed has been dependent on the medium of propagation of the wave, The transmission has been the transfer of sound energy, the medium with compact structure has been consisted of the higher speed with the medium having distinct particles.
The speed is also dependent on the temperature as the higher temperature has fast vibrating molecules and higher speed, while lower temperature has slow-moving molecules and lesser speed.
The speed of the sound wave has been majorly dependent on temperature and medium of propagation.
For more information about the speed of the sound wave, refer to the link:
https://brainly.com/question/15685413
11. Power can be defined as (2 points)
O the distance over which work was done
O how much work can be done in a given time
O all the work in an given area
O the energy required to do work
Answer:
the energy required to do work
How many elements are in CaCI2
Answer:
It is made up of 2 elements. The elements are calcium and chlorine.
Explanation:
I just know
Atoms are made of subatomic particles called protons, electrons and neutrons. What is true about the number of protons and electrons in a
stable atom?
A. the number of protons and electrons are equal
B. there are less protons than electrons
C. there are more protons than electrons
What are the fields of science??
Answer:
Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science. These branches of natural science may be further divided into more specialized branches. But that is more writting to explain
Explanation:
Julie enters science so excited to do her lab. She sets down her book back, gets all of her safety gear on and begins to gather her materials immediately. What is Julie doing wrong?
Answer:
What Julie did wrong is that she did not read the instructions for her lab of wait for her instructor to allow her to get started.
Explanation:
it is essential to know what you are doing in a science lab because you can be injured seriously if you don't stop and take time to read and listen to you instructors directions.
what is the SI unit of volume?
Answer:
[tex] \boxed{ \bold{ \huge{ \boxed{ \sf{cubic \: meter \: ( \: {m}^{3} )}}}}}[/tex]
Explanation:
The space occupied by a body or a substance is known as volume. The standard unit or SI unit of volume is cubic meter ( m³ ).
Hope I helped!
Best regards! :D
For water, the value for the latent heat of vaporization is 6.8 times greater than the latent heat of fusion. Imagine we were adding heat at a constant rate to a block of ice in a beaker on a hot plate, and it took 4 minutes for the ice to melt completely. How long would it take, after the water started boiling, for the beaker to be completely empty (the liquid water totally converted to water vapor)?
Answer:
Time of vaporization = 0.588 minutes
Explanation:
The latent heat of fusion is the heat required to change the substance from solid (ice) to liquid completely, without further increase in temperature.
The latent heat of vaporization is the heat required to change a liquid to gas completely, without an increase in temperature.
Latent heat of vaporization = 6.8 times Latent heat of fusion
This means that the time it takes for the latent heat of vaporization to complete vaporization is 6.8 times lesser than the time it takes for the latent heat of fusion to complete fusion
Time of vaporization = 6.8 times lesser than time of fusion
Time of vaporization = (time of fusion) ÷ 6.8
where: Time of fusion = 4 minutes
∴ Time of vaporization = 4 ÷ 6.8
Time of vaporization = 0.588 minutes
Intermolecular forces are responsible for which of the following. Select all that apply. Question 5 options: A) Boiling points B) Melting points C) Solubility D) Phase (solid, liquid, gas) at room temperature E) None of the choices are applicable
Answer:
A) Boiling points
B) Melting points
D) Phase (solid, liquid, gas) at room temperature
Explanation:
Intermolecular forces are attractive forces between molecules. Generally, intermolecular forces are much weaker than intramolecular forces.
All substances exist in one of three states: gas, liquid, or solid. The major difference between the condensed state and the gaseous state is the distance separating molecules.
The boiling points of substances often reflect the strength of the intermolecular forces operating among the molecules. At the boiling point, enough energy must be supplied to overcome the attractive forces among molecules before they can enter the vapor phase. If it takes more energy to separate molecules of substance A than of substance B because A molecules are held together by stronger intermolecular forces, then the boiling point of A is higher than that of B. The same principle applies also to the melting points of the substances. In general, the melting points of substances increase with the strength of the intermolecular forces.