Answer:
I agree with D
Explanation:
Took the test on Edge
The characteristic do all parts of the electromagnetic spectrum share is that they travel at the same speed through empty space. The speed of these waves are the speed of light in vacuum.
What is electromagnetic spectrum?Electromagnetic spectrum is the arrangement of different types of radiations in the order of their increasing frequency or decreasing wavelength.
The order of the waves in the increasing order of frequency is radio waves, microwaves, infrared rays, visible light, ultraviolet rays, x-rays and gamma rays.
The frequency and wavelength of all these waves are different. However, they travel at the same speed in empty space equal to the speed we say for the light.
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i have a few question please help its due in a few hours
1. Determine the specific heat of a certain metal if a 450 gram sample of it loses 34,500J of heat as its temperature drops by 97K
2. The temperature of a 25 gram sample of a certain metal drops by 103 K as it loses 2600 joules of heat. What is the specific heat of the metal?
3.What is the final temperature after 840 Joules is absorbed by 10.0g of water at 298K?
(please show steps)
Answer:
1 = c = 0.79 j/g.K
2= c = 1 j/g.K
3 = T2 = 123.1 K
Explanation:
Given data:
Specific heat of metal = ?
Mass of metal = 450 g
Heat loses = 34,500 j
Temperature drop = ΔT = 97 K
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
34500 j = 450 g ×c × 97 K
34500 j = 43650 g.K ×c
c = 34500 j/43650 g.K
c = 0.79 j/g.K
2)
Given data:
Specific heat of metal = ?
Mass of metal = 25 g
Heat loses = 2600 j
Temperature drop = ΔT = 103 K
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
2600 j = 25 g ×c × 103 K
2600 j = 2575 g.K ×c
c = 2600 j/2575 g.K
c = 1 j/g.K
3)
Given data:
Mass of water = 10 g
Heat absorbed = 840 j
Initial temperature drop = 298 K
Final temperature = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
840 j = 10 g ×4.18 j/g.K × [T2 - 103 K]
840 j = 41.8 J/K × [T2 - 103 K]
840 J/41.8 J/ K = T2 - 103 K
20.1 k = T2 - 103 K
T2 = 20.1 K + 103 K
T2 = 123.1 K
In your own words describe a chemical change and physical change.
Which compound forms a powerful acid and also contains a halogen?
A. H2S
B.HBr
C.Li2O
D.LiBr
Answer:
HBr
Explanation:
Answer:
The answer is in fact HBr
Explanation:
I took the quiz
:)
How many sig. figs. are in the following numbers?
1) -16
5) 10,000
2) 5.000 x 1011
6) 2060
3) 0.009090
7) 3.50 x 10-5
4) 4,010
8) 80.011
9) 97.0
10) 0.0010
11) 46.074
12) 0.6
Answer:
1. 2
2. 1
3. 1
4. 3
5. 3
6. 2
7. 3
8. 1
9. 2
10. 1
11. 3
12. 1
Explanation:
There are 3 main significant figure rules, I suggest looking them up online to confirm these answers
Write 0.0000745 in scientific notation.
Answer:
the answer is 7.45 x 10^-5
Move the decimal point 5 places to the right.
When water boils and becomes steam at around 100 degrees Celsius, this is an example of a
A. Physical change
B. Chemical change
C. Chemical reaction
D. Covalent bond?
Can someone answer this truly or get report not to be mean just want a right answer but listen to this tell me if this is crazy i so like i notice that same day that i got on here is the same day my girlfriend started brainly the same day i did is that a coincident or not like that is crazy my words may have been right it just happens when you least expect it like the soulmate things .
Answer:
It's most likely a coincidence.
Who do you think should be responsible for cleaning up all the space junk orbiting the earth?
Please I really really needed help
Answer:
astronots there already up there so they might as well do it.
Can someone help me please
Answer:
Strange question. All the answers are D
Explanation:
I don't exactly know how you should answer this. I can find the charge on Chromium. The only hope is that they are all the same.
[Cr(OH)_-6]^-3
x - 6 = -3 Add 6
x = -3 + 6
x = 3
======
CrO4 ^-2
x - 4*2 = - 2 add 8
x = -2 + 8
x = 6
================
Water has no effect on the charge. The chromium has a charge of +2
PLEASE ASAP
A calcium atom has 20 protons, 18 electrons, and 20 neutrons. What is the charge on the atom?
Answer:
Ca2+ represents an ion with 20 protons and 18 electrons.
Explanation:
A calcium atom has 20 protons and 20 electrons. The 2+ charge next to the symbol indicates a loss of two electrons: 20-2=18.
The highest mountain in North America is Mt. McKinley at 3.848 miles high. How many kilometers is that?
Help please
C2H4O2
1. How many different atoms are in the compound above?________
2. How many atoms of hydrogen?__________
3. How many total atoms are in this compound?________
4. If a big 2 were added in front of the formula, what would that mean?
Answer:
1. There are three different atoms
2. There are 4 hydrogen
3. There are 8 atoms in the compound
4. All the atoms are double the number
What should go in the blank?
^38 19K —> _____ + ^0 -1β
A: ^38 18Ar
B: ^38 20Ca
C: ^39 20Ca
D: ^39 19K
Answer:
³⁸₂₀Ca.
Explanation:
³⁸₁₉K –> __ + ⁰₋₁β
Let ʸₓA represent the unknown.
Thus the equation above can be written as:
³⁸₁₉K –> ʸₓA + ⁰₋₁β
Thus, we can obtain the value of y an x as follow:
38 = y + 0
y = 38
19 = x + (–1)
19 = x – 1
Collect like terms
19 + 1 = x
x = 20
Thus,
ʸₓA => ³⁸₂₀A => ³⁸₂₀Ca
Therefore, the equation is:
³⁸₁₉K –> ³⁸₂₀Ca + ⁰₋₁β
Which particles can be found in the nucleus of an atom?
-protons and neutrons
-protons and electrons
-alpha particles
-neutrons and electrons
Answer:
proteins and neutron.
Answer:
A
Explanation:
The only thing Keith Rodriguez controls in his hot air balloon is altitude. How does he control the balloons altitude?
A sound wave is traveling at 331 m/s and has a frequency of 126 Hz. What is the wavelength?
2.626984127 m
Explanation:You have to know the equation that relates wavelength, frequency, and velocity (it's like speed but a bit different).
v = f x λ
where:
v = velocity
f = frequency
λ = Wavelength
Rearrange to make λ subject:
λ = v / f
We've been given 331 as the speed, 126 as the frequency. Sub it into the equation:
331 / 126 = 2.626984127 m
Which phase change is best described by the following expression:
molecules moving very fast and far apart suddenly find themselves close
together but yet able to still move past each other? *
Answer:
Explanation:
Do you go to gami
In any measurement, which digit is the uncertain digit?
Answer:
The last digit is estimated
Explanation:
the last digit of any measurement is estimated, and it is this estimated digit that reflects uncertainty. The more decimal places there are the less uncertainty there is.
The number of significant figures is uncertain in a number that ends with a zero to the left of the decimal point location. The zeros in the measurement 1,300 grams could be significant or they could simply indicate where the decimal point is located.
According to the concept of significant figures, the last digit is uncertain digit in a measurement.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
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The density of an object is .835 g/cm3. If its volume is 34 cm3, what is the mass of the object? (Density: D = m/v)
Answer:
The answer is 28.39 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 0.835 × 34
We have the final answer as
28.39 gHope this helps you
what is the mass number of an element with an atomic number 10 and 10 neutrons
Answer:
Neon
Explanation:
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irieiwkaaj
Most of an atom consists of empty space. Its mass is concentrated in its center, which is called the
nucleus. The nucleus consists of protons and neutrons. (The ordinary hydrogen atom is an
exception; it contains one proton but no neutrons.) Protons carry a positive electrical charge, while
neutrons carry no electrical charge. Circling the nucleus is a cloud of negatively charged electrons.
Answer:
Most of an atom consists of empty space. Its mass is concentrated in its center, which is called the nucleus. The nucleus consists of protons and neutrons.
Explanation:
I REALLY NEED HELP!!
Use dimensional analysis to make the following conversion:
2560 cm = _________m
Answer:
2560 cm = 25.6m
Explanation:
in a plant,root cells are different from leaf cells because they have no ?
Answer:
Answer. As a leaf cell is a plant cell contains chloroplasts for photosynthesis which the root hair cell does not have, leaf cell also contains larger vacuoles and the presence of a cell wall.
Explanation:
which 2 elements form ionic chlorides and why?
Answer:
sodium magnesium
Explanation:
by ganning one electron
Neil is comparing the shifts in light patterns of two distant galaxies. Using a powerful telescope, he records the light shifts of each galaxy every 20 seconds (s) for six hours (hr). After sharing his data with Betty, another astronomer, she says that this is not an experiment.
Which of the following statements supports Betty's claim?
A.The hypothesis is actually the first step in the scientific method.
B.The hypothesis guides the researcher towards the results of the experiment.
C.The hypothesis provides the steps needed to analyze the data to reach conclusions.
D.The hypothesis provides a prediction about what might happen during the experiment.
Answer:c
Explanation: can someone help me to see if this is true
what happens to the atoms of the reactants during a chemical reaction?
5. (04.03 LC)
Which of the following steps can be used to identify an acid-base reaction
Check if one element replaces another element in a compound.
Check if the ions of two compounds exchange places.
O Check whether the reactants are an acid and a base.
Check whether the products are an acid and a base.
Plz help
Answer: Check whether the reactants are an acid and a base.
Explanation:
The step to determine the acid-base reaction, it has been checked that where there has been an acid or base in the reactants or not. Thus, option C is correct.
The acid base reaction can be described as the chemical reaction involving the exchange of hydrogen ions in between the reactant species.
The acid base reaction has been mediated in the system where there has been the presence of an acid or base as the reactant in order to accept or donate hydrogen ions.
Thus, to determine the acid-base reaction, it has been checked that where there has been an acid or base in the reactants or not. Thus, option C is correct.
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How many valence electrons will atoms in group 16 of the periodic table have?
Answer:
6 valence electrons
Explanation:
Peptides can be separated using an ion‑exchange column based on their isoelectric (pI) values. At which pH values would two different peptides, one with a pI of 5.55.5 and the other with a pI of 9.29.2 , bind to a cation‑ and anion‑exchange column? Each peptide may be capable of binding to each column at more than one pH value.
Answer:
At pH of 3.6, Peptide A and B will bind to the anion-exchange column, while neither peptide will bind to the cation-exchange column.
At pH of 6.6, Peptide A will bind to the cation-exchange column while Peptide B will bind to the anion-exchange column.
At pH of 10.0, Peptide A and B will bind to the cation-exchange column, whereas neither peptide will bind to the anion-exchange column.
Note: The question is incomplete. A sample complete question is found in the attachment below.
Explanation:
If pH is greater than pI, the net charge on the peptide is negative.
When pH = pI, the net charge is zero
When pH is less than pI, the net charge on the peptide is positive.
A positively charged peptide will bind to an anion-exchange column, whereas a negatively charged peptide will bind to a cation-exchange column.
At pH of 3.6, Peptide A and B will bind to the anion-exchange column, while neither peptide will bind to the cation-exchange column.
At pH of 6.6, Peptide A will bind to the cation-exchange column while Peptide B will bind to the anion-exchange column.
At pH of 10.0, Peptide A and B will bind to the cation-exchange column, whereas neither peptide will bind to the anion-exchange column.
what is the metal that is grouped with metalloids
Answer:
The post-transition metals cluster to the lower left of this line. Metalloids: The metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po). They form the staircase that represents the gradual transition from metals to nonmetals.
Explanation: i googled it
The metal that is grouped with metalloids are
boron, silicon, germanium,arsenic, antimony, and tellurium.A metalloid is a type of element which possesses the characteristics of both the metals and the non-metals.
Metals are those elements that are good conductors of heat and electricity while non-metals are those elements that neither conducts heat nor electricity.
The characteristics of the metalloids listed above are:
They conduct heat only at higher temperatures. The metalloids that can conduct electricity are called semi-conductors.They are shiny like metals but brittle like non-metals.Therefore, since these elements share both the properties of metals and non-metals, they are called the metalloids.
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