is ice forming and then melting back into water a physical change
yes it isssss abcdefghijk
A student measures the mass and volume of a
substance and calculates its density as 1.40 g/mL. The
correct, or accepted, value of the density is 1.30 g/mL.
What is the percentage error of the student's
measurement?
Answer:
The answer is 7.69 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual number = 1.30 g/mL
error = 1.40 - 1.30 = 0.1
We have
[tex]p(\%) = \frac{0.1}{1.3} \times 100 \\ = 7.692307...[/tex]
We have the final answer as
7.69 %Hope this helps you
A train in Japan can travel 813.5 miles in 5 hours
Answer:
162.7miles/hr
Explanation:
Given parameters:
Distance covered by the train = 813.5miles
Time taken = 5hours
Unknown:
Speed of the train = ?
Solution:
Speed is a physical quantity.
It is mathematically expressed as;
Speed = [tex]\frac{distance}{time}[/tex]
So, input parameters and solve;
Speed = [tex]\frac{813.5}{5}[/tex] = 162.7miles/hr
describe how the current modern atomic theory and model differs from the model jj Thompson proposed ?
1. A cube of wood having an edge length of 15.3 cm has a mass of 2800 grams. What is the
density of the wood in g/cm3?
Answer:
a cube wood is mass ig haha sorry bby :(
Explanation:
the elements boron, silicon, germanium, and arsenic be classified into? *
What does analyzing data involve?
A. Comparing trends or patterns that prove the hypothesis
B. Observing an experiment to collect data
C. Creating a hypothesis to answer a question
D. Forming a hypothesis to develop an experiment
Answer:
A. Comparing trends or patterns that prove the hypothesis
Explanation:
Analyzing data involves comparing trends or patterns that prove the hypothesis. Sometimes, the trend might invalidate the hypothesis.
Data analysis is a very important process in course of experimentation. It brings out the meaning of data and makes data useful. Analysis involves establishing patterns from a given set of data. The main aim of data analysis is to identify useful information. It usually entails cleansing and transforming data into a set that can be useful.Theorists try to find ways to explain human behavior in rational ways. It seems irrational to break rules, if we want to maintain social order. We are largely constrained by the rules and obliged to behave in a particular way or to avoid certain behaviors. What motivates people to break social rules? Do you think powerful and famous people tend to break more rules? Is it worth breaking these rules? No Response(s) Be the first to respond to the Discussion topic!
Answer:
See explanation
Explanation:
According to Burgess (1996); 'We don't break rules because it 'doesn't feel right' to do so. Some elements of personality can determine whether we will break rules or not, particularly when the moral/social-conventional distinction is taken into consideration'.
If an individual has the urge to behave in a manner that transgresses social rules, personality characteristics now come into play here. Personality traits determines whether the individual considers him/herself as bound by the rules. Some people will follow the rules absolutely while some only follow rules that they consider important, a small proportion will not follow any rule that prevents them from achieving their set objectives.
Famous people become carried away with affluence and position and tend to break more rules since they believe that they will always get away with it because of whom they are.
Irrespective of the circumstances, it is never worth it to break a rule. We always have to see ourselves as bound by rules as part of our social responsibility.
Do you guys have viruses wit this website
Which two elements have similar characteristic
Answer:
Ca and Ba
Explanation:
Mainly because both Ca and Ba are able to form ionic bonds also both Ba and Ca are earth, in that case they have similar characteristics
A total of eighteen electrons can be placed into the 3rd energy level.
Explain WHY?
Answer:
each principal energy level above the second contains, in addition to one s orbital and three p orbitals, a set of five d orbitals, called the d sublevel. The five d orbitals can hold up to 10 electrons. Thus, the third level holds a maximum of 18 electrons: 2 in the s orbital, 6 in the three p orbitals, and 10 in the five d orbitals.
Explanation:
A student decided to research primate psychology for their science project. They measured how long it took gorillas to adapt to their new habitat when moved from one zoo to another. They measured how long it took the new gorilla to interact regularly (more than 3 times per day) with the gorillas that already live there. Seven different cases were examined and the data collected. What can be said about the data? [GorillaTime to interact (days)12.523.138.343.352.763.273.4]
[
Gorilla 1 2 3 4 5 6 7 Time to interact (days) 2.5 3.1 8.3 3.3 2.7 3.2 3.4
]
A. The data is only measured to one decimal place, so it is not reliable.
B. The data falls within similar ranges so it may be reliable.
C. The data is reliable because there is only one outlier.
D. The data may not be reliable because there is an outlier.
Answer: the answer is D im pretty sure
Explanation:
What is the kinetic energy of a 100 kg bear running at 3 m/s
Answer:
The answer is 450 JExplanation:
The kinetic energy of a body can be found by using the formula
[tex]KE = \frac{1}{2} m {v}^{2} \\ [/tex]
where
m is the mass
v is the velocity
From the question
m = 100 kg
v = 3 m/s
We have
[tex]KE = \frac{1}{2} \times 100 \times {3}^{2} \\ = 50 \times 9[/tex]
We have the final answer as
450 JHope this helps you
How does Newton’s laws explain motion
Explanation:
Newton's second law is a quantitative description of the changes that a force can produce on the motion of a body. It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it.
When we mixed milk and vinegar in the lab demonstration, a/an __.
was created.
Answer:
Plastic
Explanation
Found on google
How would you arrange the objects below from greatest to least volume?
A balloon
A water bottle
A bottle of soda
A rock
Answer:
A balloon
A bottle of soda
A rock
A water bottle
Explanation:
ultraviolet radiation has a higher frequency than visible light. which type of light wave carries more energy?
a=they carry the same amount of energy
b=visible light
c= ultraviolet radiation
Answer:
The answer to this question is C; ultraviolet radiation
Explanation:
The the reason for this is because it carries more energy per photon than visible light does. Light travels at a speed of 299,792 kilometers per second (about 186,282 miles per second).
How do I do this problem???
Answer:
i believe it's c
Explanation:
my reason is that if you look at the electrons 2 is the most comm
Identify the heterogeneous mixtures.
Group of answer choices
salad
water
vegetable soup
apple juice
trail mix
brass
can u see water vapour by a microscope?
Answer:
It can be formed either through a process of evaporation or sublimation. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form
Explanation:
hope it help
Answer:
No. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form
If the reaction force is _____, a net force is created and will accelerate the object.
Answer:
directly proportional
Explanation:
have a good day
Answer:
Unbalanced is the answer
please help this is due in 30 minutes!!
Answer:
Hello. The answer is A (10)
Explanation:
If you memorize the periodic table it will be very easy to answer.
But if you don't know،
The solution is to count the electrons number
In an atom usually electrons number is equal with protons number
In this shape there are 10 electrons
So there are 10 protons in nucleus.
A nuclear reaction, such as those which occur in a nuclear power plant, can be classified as what
type of reaction?
solar
chemical
exothermic
endothermic
what is atomic mass
Answer:
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
Answer:
The atomic mass is the mass of an atom.
Explanation:
What is the significance of an electronegativity difference of 1.7 between 2
atoms?
O A. It tells which atoms form positive ions and which atoms form
negative ions.
OB. It represents the boundary between what is considered to be an
ionic or a covalent bond.
C. It determines if the 2 atoms will react to form a molecule.
D. It identifies which metal atoms will join together to form metallic
bonds
Am
B. It represents the boundary between what is considered to be an ionic or a covalent bond.
Further explanationElectronegativity is the ability of atoms to attract electrons, especially in covalent bonds (sharing of electron pairs)
In a periodic system, electronegativity increases in a group, from bottom to top, and in a period from left to right.
From this difference in electronegativity, we can determine the ionic compound, polar or non-polar
Pauling determined the electronegativity scale (based on bond energies), between 0.7 - 4 (Fluorine has the highest number of electronegativities: 4)
Polar covalent compounds have a large electronegativity difference, while nonpolar compounds have a small electronegativity difference.
We can use the difference in electronegativity between the 2 bonded atoms to determine their polarity
<0.5: covalent non polar 0.5- 1.7: covalent polar > 1.7 : ionExample
H₂OH = 2.1
O = 3.5
H₂O = 3.5-2.1 = 1.4 >> polar
O₂= 3.5-3.5 = 0 >> non polar
What is the volume of kristas rock
Answer:
30
Explanation:
Measure the water rised in the beaker which is 180 and subtract 150 and you get 30
is the volume of a coffee cup closer to 300 cm cubed or 300 dm cubed
Answer:
It is closer to 300 cm cubed
Explanation:
The volume of a coffee cup is closer to 300 cm cubed because their american volumes are around 10 ounces, and 10 ounces equals about 300 cm cubed. Hope it helps!
What do these two changes have in common?
sauce burning on a stove
dry ice sublimating and becoming a gas
Select all that apply.
Both are caused by heating.
Both are only physical changes.
Both conserve mass.
Both are chemical changes.
Answer:
Both are caused by heating and both are physical and chemicals.
Explanation:
The similarity between the two changes that have common things are
A. Both are caused by heating.
C. Both conserves mass.
D. Both are chemical changes.
What are chemical and physical changes?The term “physical change” refers to a change in an object's appearance. When there is a change in the surroundings of the object, such as a rise in temperature or pressure, a physical change takes place.
When candles are burned, the wax melts, but as soon as the temperature drops, the wax hardens and solidifies once more.
Here, chemical changes happen because these changes can not be undone again. When a substance changes their appearance, they always have the same mass.
Thus, the correct options are A. Both are caused by heating, C. Both conserve mass, and D. Both are chemical changes.
To learn more about chemical and physical changes, refer to the link:
https://brainly.com/question/8632035
#SPJ2
what makes a substance a molecule? it’s 7th grade science
Answer:
Molecular substances are made when two or more atoms join together by covalent bonds.
Explanation:
I hope this helps. I took the same class.
Two people are pulling on a rope, like in the picture below. The person on the left pulls at 5 N and the person on the right pulls 5 N. What is the net force on the rope?
Answer:
The net force is 0
Explanation:
because both people on either side are pulling the rope with the same force