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Hand tools in need of repair or replacement create hazards. Tools with wooden handles, like hammers and axes, can splinter or break in the middle of use, resulting in injury. Impact tools like chisels are unsafe for use if they have “mushroomed” heads because they could shatter on impact and cause injury.
Why water in a container is
Curved but not flat
Ice cracking
a
Chemical Change
b
Physical Change
Answer:
Physical change
Explanation:
As no new substance is formed
ii. What is the purpose of the scientific method? (2 points)
b. Through his meticulous experiments, Lavoisier first proposed what is now known as the law of conservation of matter. A similar law developed later, which was called the law of conservation of energy. (6 points)
i. What does the law of conservation of energy say? (2 points)
ii. List two different kinds of energy. (2 points)
iii. What does the law say about changes energy can undergo? (2 points)
Answer:
ii. Purpose of scientific method
=The Scientific Method helps you put together experiments, use data to find conclusions and interpret them. In short, the Scientific Method is a step-by-step process: First, observe. Use your senses and take notes about the situation
The aim of all scientific methods is the same which is used to analyze the observation made at the beginning. It has been seen that various steps are adopted per the requirement of any given observation. Observation is the first step of scientific method.
What is scientific method?The process with the help of which scientists try to investigate, verify or construct an accurate and reliable version of any natural phenomena is defined as the scientific method. They are done by creating an objective framework for the purpose of scientific enquiry.
The purpose of scientific method is to provide discrete steps for analytically answering a research question. It involves the formulation of hypotheses and application to come up with logical explanations.
The scientific method establishes the facts through testing and experimentation. It involves prediction, conducting experiment and last analyze the results.
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According to the Bohr model for the hydrogen atom, the energy of the atom isn't continuous but has certain discrete energy ________, each of which is related to a fixed circular _____________ of the electron around the nucleus. The farther the electron is from the nucleus, the ________ the energy system.
Answer:
in the part of material and also its gaining to support almost imaginary for all over of this things
out of magnesium and Calcium which element is more reactive give reason
Answer:
Calcium is more reactive.
Explanation:
It is higher in the reactivity series, and contains more energy levels.
Two skaters stand on ice. one weights 250 N, and the other weights 500 N. They push against each other and move in opposite directions. Describe the momentum of each skater after they push away from each other.
Answer:
Because law of momentum, makes it equal
if electromagnetic radiation has a frequency of 2.0 x 10^15 s^-1 what is the radiation’s energy?
[tex]1.3\times 10^{-18}[/tex] Joule is the radiation’s energy.
Explanation:
The energy of electromagnetic radiation is given by Planck's law:[tex]E=h\times \nu[/tex]
Where:
E = Energy of electromagnetic radiation
h = Planck's constant=[tex]6.626\times 10^{-34} Js[/tex]
[tex]\nu[/tex] = frequency of the electromagnetic radiation
Given:
The frequency of the electromagnetic radiation =[tex]\nu = 2.0\times 10^{15} s^{-1}[/tex]
To find:
The energy of the electromagnetic radiation
Solution:
The frequency of the electromagnetic radiation = [tex]\nu = 2.0\times 10^{15} s^{-1}[/tex]
The energy of the radiation = E
[tex]E=h\times \nu\\E=6.626\times 10^{-34} Js\times 2.0\times 10^{15} s^{-1}\\=1.3\times 10^{-18} J[/tex]
[tex]1.3\times 10^{-18}[/tex] Joule is the radiation’s energy.
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what is the difference between a base and an alkaline
Answer:
Base Alkali
1)All bases are not alkali 1)All alkali are bases
2)It neutralizes acids 2) It releases OH- ions, accepts a proton
3)Example: Zinc hydroxide, copper oxide 3)Example: potassium hydroxide, sodium hydroxide
What isotope will be formed by the fusion of a H-1 isotope and a H-3 isotope? Would the
product be a stable Isotope? Explain.
|
Answer:
Use the edit icon to pin, add or delete clips.
Explanation:
hfdknvd hcde
A 2.00 mL of substance A has a density of 18.4 g/mL and a 5.00mL sample of substance B has a density of 35.5 g/mL. Do you have an equal mass of Substances A and B.
Answer:
No, you have more mass of substance B
Explanation:
use d =m/v to find mass
m= d*v
mass A = 18.5 g/mL * 2.00 mL = 37 g
mass B = 35.5 g/mL * 5.00 mL = 177.5 g
No, the substances A and B does not have equal mass. A further explanation is provided below.
Given:
Density,
D₁ = 18.4 g/mLD₂ = 35.5 g/mLVolume,
V₁ = 2.00 mLV₂ = 5.00 mLAs we know,
→ [tex]Mass = Density\times Volume[/tex]
The mass of substance A will be:
→ [tex]m_A = 2.00 \ mL\times 18.4 \ \frac{g}{mL}[/tex]
[tex]= 2.00\times 18.4 \ g[/tex]
[tex]= 36.8 \ g[/tex]
The mass of substance B will be:
→ [tex]m_B = 5.00 \ mL\times 35.5 \ \frac{g}{mL}[/tex]
[tex]= 5.00\times 35.5 \ g[/tex]
[tex]= 177.5 \ g[/tex]
We can see that [tex]m_A \neq m_B[/tex].
Thus the above response is correct.
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Which of the following is a result of
condensation?
A. deserts
B. seasons
C. clouds
D. rocks
Answer: should be c. clouds :)
Explanation: condensation is the change of water to a gaseous form. it generally occurs in the atmosphere when warm air rises, cools, and loses its capacity to hold the water vapor. excess water vapor condenses to form cloud droplets.
Answer: clouds
Explanation: theyre air and water
5. What is common among the following phenomena?
* Blinking of traffic light
* Rotation of blades of fan
* Swinging of pendulum of a clock
a) All are chemical changes
b) All are periodic changes
c) All are undesirable changes
d) All are irreversible changes
Answer:
All are periodic changes
[And is that a todoroki pfp, I like MHA too
(・∀・) ]
A group of students conducted an experiment to determine the effect of heat on the germination(sprouting) of sunflower seeds. Which of the variables listed below is the least important to control in this experiment?
a
the temperature of which the seeds are heated
b
the length of time the seeds are heated
c
the type of soil used
d
the amount of moisture in the soil
what grade is this because apparently i like to know what grade it is before i solve it
What is the best definition of
molecule?
A. A molecule is an atom that cannot be broken
down.
B. A molecule is a positively charged partide.
C. A molecule is the smallest part of a substance
that is still that substance
Answer:
C
Explanation:
A molecule is a smallest particle of a substance that has all of the physical and chemical properties of that substance. or
Molecules are two or more atoms chemically joined together.
I don't know how to write about tentative.....can u help me?
Answer:
The definition of tentative is not definite or final. An example of tentative is possible, though not definite, plans to go to the movies sometime on Friday.
You have two pure substances that you cannot identify. Each sample is solid at room temperature. Describe at least five stopes in the appropriate sequence that you wpild take to be able to identify the substance
~Easy Points~.........what does H2o stand for ?
define mitochondria.
Answer:
An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner part being folded inwards to form layers (cristae).
Explanation:
Does an astronaut have more mass on earth then space? why or why not?
Answer:
No
Explanation:
No, his mass remains the same no matter where he is in the universe.
But then again the moon has less gravitational pull, therefore your weight and mass will be smaller in space and on the moon than on earth
I hope this was helpful! ;)
You just created the equality 1 fluid oz f l u i d o z = 29.7 mL m L . Use this equality to determine how many ounces of water will be measured using the measuring cup introduced before Part A when making the cake. Keep in mind that the level of precision for the measuring cup is to the half-ounce as you round your answer.
The equality of both units (i.e. mL and ounces) implies they measure the same quantity, and they can be converted between one another.
Given that:
[tex]1 fl\ oz = 29.7mL[/tex]
The measurement in part A is not given. So, I will use an assumed value to provide an explanation.
Assume that the amount of water measured using the measuring cup in part A is 10mL
The equivalent number of ounces (x) is calculated as follows:
[tex]1 fl\ oz = 29.7mL[/tex]
[tex]x = 10mL[/tex]
Cross multiply
[tex]x \times 29.7mL = 1fl\ oz \times 10mL[/tex]
Cancel out common units
[tex]x \times 29.7 = 1fl\ oz \times 10[/tex]
[tex]x \times 29.7 = 10fl\ oz[/tex]
Divide both sides by 29.7
[tex]x = \frac{10}{29.7}fl\ oz[/tex]
[tex]x = 0.3367 fl\ oz[/tex]
Approximate to the nearest half
[tex]x = 0.5 fl\ oz[/tex]
This means that the equivalent amount of water is 0.5 ounces
What if the measurement is 55mL.
We apply the same steps, as follows:
[tex]1 fl\ oz = 29.7mL[/tex]
[tex]x = 55mL[/tex]
Cross multiply
[tex]x \times 29.7mL = 1fl\ oz \times 55mL[/tex]
Cancel out common terms
[tex]x \times 29.7 = 1fl\ oz \times 55[/tex]
[tex]x \times 29.7 = 55fl\ oz[/tex]
Divide both sides by 29.7
[tex]x= \frac{55}{29.7 }fl\ oz[/tex]
[tex]x= 1.85185 fl\ oz[/tex]
Approximate to the nearest half
[tex]x = 2fl\ oz[/tex]
This means that the equivalent amount of water is 2 ounces
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Someone plz help me :(
Answer:B
Explanation:
Because that vaccine can help from people dieing.
An Exothermic reaction is
o when energy is released
O when energy is absorbed
O When energy is not released or absorbed
O No answer text provided.
A. Identify the type of molecule shown in the drawing. (2 points)
Answer: 1) Caboxylic acid
2) Ether
3) Ester
4) Aldehyde
5) Amine
6) Alcohol
Explanation: The type of a molecule is based it's primary functional group.
https://en.wikipedia.org/wiki/Functional_group
The identities of the given molecules shown in the drawing are:
1) Carboxylic acid.
2) Ether
3) Ester
4) Ethane
5) Aldehyde
6) Amine
7) Alcohol
What are the organic compounds?Organic compounds are those compounds, which contain carbon-carbon and carbon-hydrogen bonds.
The five organic compounds are lipids, carbohydrates, protein, nucleotide, etc.
Thus, the correct option is 1) Carboxylic acid.
2) Ether
3) Ester
4) Ethane
5) Aldehyde
6) Amine
7) Alcohol
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Please help me with this chemistry
Answer:
D=1.56g/mL
Explanation:
Density=m/v
D=14.06g/(24mL-15mL)
D=14.06g/9mL
D=1.56g/mL
Which is correct?
a
Electrons in a p sublevel can shield the s electrons that are in the same
principal energy level.
b
Electrons in an s sublevel can shield the p electrons that are in the same
principal energy level.
с
Both a and b are true.
d
Neither a nor b are true.
Draw a sketch of a hot air balloon and of a helium balloon. Define the systems by identifying the system boundaries. Show inputs and outputs of matter and energy in each. Use your Evidence Notebook if necessary.
Explanation:
When you heat the air it expand its volume, but its mass remain the same, so the density of the hot air balloon is smaller than the density of the air outside it, so the hot air balloon can float.
In the case of the helium balloon, there's no source of energy, but the helium is naturally lighter than the atmospheric air, so its density is naturally smaller than the air, and the helium balloon have a smaller density than the air too, so it can float.
A closed system can interchange energy with its surrounding, but not matter.
A closed system can exchange energy but not matter, with its surrounding environment. The energy that enters into a closed system may derive from different forms (e.g., heat or work, kinetic energy)Conversely, an open system can exchange both energy and matter with its surrounding.In conclusion, a closed system can interchange energy with its surrounding, but not matter.
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What is Technology mean?
Answer:
The branch of knowledge dealing with engineering or applied sciences is called technology .
Hope this helps you!
any two uses of mixtures
Answer:
Any two used of mixtures are 1) sand and water 2) sugar and salt
Explanation:
Explain why the product at the negative electrode is not always a metal.
The product at the negative electrode is not always a metal because it will only be produced if it is less reactive than hydrogen.
What is a Metal?These are materials which donate electrons in a chemical reaction and have high heat and electrical conductivity.
Metals are more reactive than hydrogen which is why it is not always produced at the cathode.
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Is Cl2 chlorine, dichlorine or dichloride?
Answer:
Cl² is dichlorine
Explanation:
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