Answer:
True
Explanation:
The given statement is true.
A scientific model is defined as the mathematical and physical representation of a process or event. Scientists perform several observations or experiment and find a connection between them to prove a scientific finding.
A scientific model has the ability of explanatory power which helps to make things easier to understand using diagrams and consistency across contexts. Testing and prediction power in scientific models leads to strong predictions and able to convince people using an appropriate model.
Hence, the correct answer is "true".
5. Express the number 1.36 x 104 in common decimal form.
A) 136000
B) 0.0000136
C) 0.000136
D) 13600
E) 1360
Answer: D
Explanation: You move the decimal back 4 times.
A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?
Answer:
I think the answer could be 13 i hope this helps
Describe 3 differences between ice, liquid water and steam.
Steam is a gas. ... The difference between a liquid and the other states of matter is that liquid molicules are more spread apart than solid molicules but less spread apart than gas molicues. Water is the base for both ice and steam.on:
The main difference between ice, liquid water, and steam is that ice is a solid, liquid water is a liquid, and steam is a gas.
What are the main difference between ice, liquid water, and steam?The first difference between ice, liquid water, and steam is that ice is solid, liquid water is liquid, and steam is gas.
The second difference between ice, liquid water, and steam is that ice is solid so the molecule of solid are closely packed and intermolecular space is negligible, liquid water is a liquid so the molecule are little far with each other and intermolecular space between molecules are more as compare to solid, and steam is gas so the molecule s are scattered freely and intermolecular space is very high as compare to solid and liquid.
The third difference between ice, liquid water, and steam is that 32°F is the freezing point of water, when temperature arises from 32°F water starts melting and converted from solid to liquid.
Therefore, the main difference between ice, liquid water, and steam is that ice is a solid, liquid water is a liquid, and steam is a gas.
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What proof did you see in the experiment that a chemical reaction took place?
Answer:
Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change
What is the relationship between heat and the state of matter of a substance? use the graph to answer the question
Answer:
How can gas become a liquard
Explanation:
air filter
How many significant figures are in the answer when you multiply 67.20 x 8.02?
How many significant figures are in the answer when you divide 486.02 by 0.056?
How many significant figures are in the answer when you add 11.264 + 245.3?
Answer: 6, 7 and 6 significant figures, respectively.
Explanation:
A. 67.20 x 8.02 = 538.944, has 6 significant figures .
B. 486.02 x 0.056 = 27.21712, has 7 significant figures .
C. 11.264 + 245.3 = 256.564 = 6 significant figures.
1. After 3 half-lives, how much of a 400 gram sample of radioactive uranium-238 remains? The half-life of
U-238 is 4.47 years.
Answer:
In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area
Explanation:
In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area ΔΔΔΔΔβαααααααααααααααααααωωωωωωωωωωωω㏒㏒㏒
After one half life, the sample gets reduced to its half of the initial amount. The 400 g will reduces to 200 g after one half life. Thus, after three half life, it will reduces to 50 g.
What is half life?Half life of a radioactive sample is the time taken to decay its half amount. The radioactive isotopes undergo decay by the emission of charged particles. The radioactive decay is a first order reaction.
Uranium is a radioactive element which undergo alpha decay to form stable nuclei with the release of tremendous energy. Given that the half life of U-238 is 4.47 years.
Afterone half life 400 g of U-238 reduces to its half that is 200 g. For the second half life, 200 reduces to 100 g and for the next half life that is after three half lives it reduces to 50g.
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A rock is placed in 10-mL of water causing the water level to rise
to 25-mL. The same rock has a mass of 7 grams. What is the density
of the rock?
Answer:
d ≈ 0.47
Explanation:
Density is represented by the ratio of mass to volume. We are given the mass (7 grams), but we need the volume.
The volume can be calculated by subtracting the new volume from the old volume.
25 mL - 10 mL = 15 mL
The volume is 15 mL and the mass is 7 grams. Now, set up the ratio. Remember, d = m/v.
d = 7/15
d ≈ 0.47
The more mass you have of a substance:
A. the greater its thermal energy
B. the slower the motion of its particles
C. the smaller its thermal energy
D. the faster the motion of its particles
leo is comparing carbon 12 and carbon 14 atoms which particles make these isotopes have different mass numbers
Carbon-12 (or 12C) contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 amu (six protons and six neutrons). Carbon-14 (or 14C) contains six protons, eight neutrons, and six electrons; its atomic mass is 14 amu (six protons and eight neutrons).
Hope this helped :)
Question 5 of 10
Why do scientists need governmental funding?
O A. Scientists have to pay taxes to the government on the money they
make.
B. The government is controlled by scientists.
O C. Government politicians ask all the important scientific questions.
O D. The cost of doing scientific research can be very high.
Answer:
d
................. ....
In Chemistry, a group of students have been presented with 2 test tubes. In both test tubes they observed bubbles rising up in a clear liquid. They are told that hydrogen gas has been produced in one test tube, while carbon dioxide was produced in the other. During this test they have been instructed to collect the gases from each reaction and identify them. How could the students collect and identify the hydrogen gas?
Answer:
Diatomic, or two atoms per molecule, hydrogen can be isolated by electrically separating distilled water. This process is known as electrolysis and creates oxygen gas as well. It is by far the easiest and safest way to collect and store hydrogen gas
Explanation:
im not sure this the correct answer but here u go
Why Aluminium oxide has higher melting point than Alumunium Chloride?
Answer:
They have high melting points . They have ionic
giant lattice structures : strong force of attraction between inland so have high melting points . They are iconic because of large electronegativity differences between the metal and oxygen ....Aluminum oxide (Al203) is ionic but does show some covalent character.
What is the density of an unknown object that has a mass of 5.0 g and volume of 20
ml?
Answer:
Density=mass / volume.
Density = 5/20.
0.25g/cm^3.
The density of the unknown object is 0.25 mL
Density of an object is defined as the mass of the object per unit volume of the object. Mathematically, it can be expressed as:
[tex]Density = \frac{mass}{volume} \\ \\ [/tex]
With the above formula, we can obtain the density of the unknown object as follow:Mass = 5 g
Volume = 20 mL
Density =?[tex]Density = \frac{mass}{volume} \\ \\ Density = \frac{5}{20} \\ \\ Density = 0.25 \: ml[/tex]
Therefore the density of the unknown object is 0.25 mL
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Question 1 2.3 kJ is how many J?
Answer:
2300J
Explanation:
1 kilojoule is 1000joules so to get how much is 2.3 multiply it with 1000
How many minutes are in 2.25 weeks ?
Answer:
22,680
Explanation:
you multiply the time value by 10080
A young child is sent to the store with exactly $3.00 to buy donuts. If the donuts on a special sale cost $0.95 per dozen, how many donuts can be bought? Assume the baker will sell individual donuts. PLEASE ANSWER AS SOON AS POSSIBLE
Answer..............nvm
Explanation:
I need help for some of the question please,
Answer:
Number 6
Explanation:
A reflex action is an involuntary action and nearly instantaneous movement in response to a stimulus.
Answer:
2. Nerves helps to send impulses or information from one place to another and it also carries sensory and motor fibres and most however are mixed nerves carrying both sensory and motor fibres.
3.The brain has many functions and the brain has different regions that deals with different functions in the body.
6.Reflex actions are automatic responses to stimuli.They do not involve the conscious (voluntary) or higher centres of the brain and so are also known as involuntary actions.
10.Loop of Henle,Bowman's Capsule, Glomerulus, Proximal Capsule.
13.Urter is part of the reproductive organ in an human being.
14.We should drink enough water and we should not store our urine,we should always empty our bowels when we feel like using the toilet.
15.Water is good for urinary system because it help for easy digestion and for easy work in the system.
12.The urine is stored in the bladder.
11.Kidneys remove nitrogenous wastes and also control the amount of water,salts and acids - the osmoregulatory function.
5.Nerves that carries the sensory fibre and nerves that carries the motor fibre.
1. Brain and the spinal cord or the central nervous system and the peripheral nervous system.
4.They carry informations from one part of the body to another and they also help in the coordination of the body.....
I think some of the answers are correct...Thank you for the questions.....
A 25.0 mL sample of sulfuric acid is titrated with 30.0 mL of 0.150 M sodium hydroxide. Calculate the concentration of the sulfuric acid.
Answer: The concentration of the sulfuric acid is 0.09 M
Explanation:
Molarity is defined as the number of moles of solute dissolved per liter of the solution.
According to neutralization law,
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1[/tex] = basicity of sulphuric acid [tex](H_2SO_4)[/tex] = 2
[tex]M_1[/tex] = Molarity of sulphuric acid [tex](H_2SO_4)[/tex]solution = ?
[tex]V_1[/tex] = volume of sulphuric acid [tex](H_2SO_4)[/tex]solution = 25.0 ml
[tex]n_2[/tex] = acidity of sodium hydroxide [tex](NaOH)[/tex] = 1
[tex]M_2[/tex] = Molarity of sodium hydroxide [tex](NaOH)[/tex] = 0.150 M
[tex]V_2[/tex] = volume of sodium hydroxide [tex](NaOH)[/tex] = 30.0 ml
[tex]2\times M_1\times 25.0=1\times 0.150\times 30.0[/tex]
[tex]M_1=0.09M[/tex]
Thus the concentration of the sulfuric acid is 0.09 M
When a jar of coffee is opened, people in all parts of the room soon notice the smell.
plain how this happens
Answer:
Explanation:
because in air the particles are moving very fast and jar of coffee has hot particles which kinetic energy is also more so that's why it's particles move faster and gets mixed with air and smell is coming from far away
i'm reasking this, i need help with this and it's due today. the answer isn't 30,240 minutes, it's the blanks i need filled in :)
Answer:
Explanation:
24hours ×21 days=
you will get the answeer
Does sugar when dissolved form ions
Explanation:
Sugar will readily dissolve in water but doesn't form cations and anions in solution. That is, there are no charge carriers formed. Substances that only partially ionize into ions when dissolved in water are called weak electrolytes.
I hope it help:)
Answer:
Dissolving sugar is a physical change. It is not a chemical change. So, ions will not be formed.
The density of mercury is 13.5g/mL. What is the volume of this liquid if the sample weighs 12.5 pounds?
Answer : The volume of liquid is 420 mL.
Explanation :
Density : The mass per unit volume of a substance is known as density.
Formula used:
[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}}[/tex]
As we are given:
Density of mercury = 13.5 g/mL
Mass = 12.5 pounds
First we have to convert mass of sample from pound to gram.
Conversion used:
As, 1 pound = 453.6 g
So, 12.5 pounds = 453.6 × 12.5 g = 5670 g
Now we have to calculate the volume of liquid.
[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}}[/tex]
Now putting all the given values in this formula, we get:
[tex]13.5g/mL=\frac{5670g}{\text{Volume}}[/tex]
Volume = 420 mL
Therefore, the volume of liquid is 420 mL.
Spongebob loves to garden and wants to grow lots of pink flowers for his pal Sandy. He bought a special Flower Power fertilizer to see if it will help his
plants produce more flowers. He plants three plants of the same size in separate containers with he same amount and type of potting soll. He places one
plant in a sunny window and waters It every day with fertilized water. He places the second plant in a more shady window and waters it every other day
with fertilized water. He places the third plant in a dark closet and waters it every day with plain water. What did Spongebob do wrong in this experiment?
he has no controlled variables
he has too many dependent variables
he has no control group
he has too many Independent variables
Explanation:
he has no controlled variables
What is the difference between physical and chemical change in chemistry?
physical changes are those changes which can be reversed in their previous form like ice to water
chemical changes are those changes which cannot be reversed in their previous form
1. the change which are reversable are known as physical change
2.no new substance are formed
3.no change in chemical nature of the substance
4. example: • melting of ice
• tearing of paper etc.
chemical change:1.this are irreversible this can't be reverse
2.new substance are formed
3.it results form a chemical reaction
4. example: • burning of wood
• rusting of iron etc.
hope it helps you :)
18 ) Liquid A and Liquid B are clear liquids. They are placed in open containers and allowed to evaporate. When evaporation is complete, there is a white solid in container B, but no solid in container A. From these results, what can you infer about the two liquids
Answer:
Liquid A is a homogeneous mixture and Liquid B is a heterogeneous mixture
Explanation:
'Liquid' is characterized as 'a substance that is flowing and does not carry a defined shape due to the gap between its molecules.'
As per the details provided, the inference that can be deduced would be:
"Liquid A is a homogeneous mixture and Liquid B is a heterogeneous mixture."
In the given illustration, the results observed lead to the conclusion that Liquid A demonstrates a homogeneous solution because its constituents are evenly distributed. Since homogeneous mixtures are very stable in nature and their components do not get separated. While Liquid B would be characterized as a heterogeneous mixture as its components are visibly separable(white solid remaining) and they can be witnessed through naked eyes.Learn more about 'liquid' here:
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Significant Figures in Multiplication and Division
A is 3600 m away from B. Jack spent 720.0 s running from A
to B. What is Jack's average speed? (Average speed =
Distance/Time)
Answer:
5m/s
Explanation:
3600m ÷ 720s
= 5m/s
What is the density of an object with a mass of 150.0 g and a volume of 20.0 mL
Answer:
7.5g/mL
Explanation:
Density = Mass/Volume
= 150.0g/20.0mL
= 7.5g/mL
how you would improve them modern day smart phones .
Answer:
We could improve modern day smart phones by adding more storage, increasing it's speed, having more feature and changing the design of the phones to make them look more better.
Hope this helps!
Answer: They can look on the cell phone ringtone?-
Explanation:
Which of the following conversion factors would be most useful in converting miles per gallon to kilometers per
liter?
1 gallon/4 quarts
1 liter/1000 ml
O 1 mile/0.62 km
O 1,000 m/1 km