19. A beam of light can be seen as it passes through a(n).
a. Element
I
b. Compound
C. Solution
d. Heterogeneous Mixture
A beam of light can be seen as it passes through a
Ok
A plant part that contains a tiny new plant, or embryo
seed
spore
root
flower
What is the frequency of a wave having 4.90 x 10 -12 J of energy?
Answer:
The answer is
[tex] \huge 7.40 \times {10}^{21} Hz[/tex]
Explanation:
To find the frequency of the wave we use the formula
[tex]f = \frac{E}{h} \\ [/tex]
where
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question
E = 4.90 × 10-¹² J
So we have
[tex]f = \frac{4.90 \times {10}^{ - 12} }{6.626 \times {10}^{ - 34} } \\ [/tex]
We have the final answer as
[tex]7.40 \times {10}^{21} \: \: Hz[/tex]
Hope this helps you
Calculate the number of moles in 2.60 grams of SnO2 ? Please show your work to receive credit.
Answer:
There are 0.017252 moles in SnO2
Explanation:
n= m/M
n=2.6/(118.710 + 2(16))
n= 2.6/150.71
n= 0.017252
Remeber to round based on the significant digits in the question.
give reason deliquescent substance truns into liquid when exposed to atmosphere air
What was one main point of Dalton’s atomic theory?
A. That atoms were made up of positive and negative charges
B. That atoms changed as they formed compounds
C. That atoms has a nucleus at the center
D. That atoms made up the smallest form of matter
The main point of Dalton’s atomic theory is that the atoms are made up the smallest form of matter. Hence Option (D) is Correct
What is Dalton's Atomic Theory ?
The 5 main points of Dalton's Atomic theory was ;
Elements are composed of extremely small particles called atoms that are indivisible and indestructibleAll atoms of a given element are identical; they have the same size, mass, and chemical propertiesAtoms of 1 element are different from the atoms of all other elementsCompounds are composed of atoms of more than 1 element. The relative number of atoms of each element in a given compound is always the same.Chemical reactions only involve the rearrangement of atoms. Atoms are not created or destroyed during chemical reactions.Therefore, The main point of Dalton’s atomic theory is that the atoms are made up the smallest form of matter. Hence Option (D) is Correct
Learn more about Atom here ;
https://brainly.com/question/657632
#SPJ2
Answer:
D is correct
Explanation:
Vocabulary Terms: Please copy down the definitions for words below from the Smart Screen.
Length is defined as
Height is defined as
Circumference is defined as
Perimeter is defined as
Diagonal is defined as
Diameter is defined as
Answer:
Explanation:
Length: Length is a measure of distance
Height:The measurement from base to top or (of a standing person) from head to foot.
Circumference:The enclosing boundary of a curved geometric figure, especially a circle
Perimeter: Length of the outline of a shape.
Diagonal:A line segment that goes from one corner to another, but is not an edge. So when we directly join any two corners (called "vertices") which are not already joined by an edge, we get a diagonal. Diagonals of Polygons.
Diameter: A straight line passing from side to side of any figure or body, through its center.
Determine whether the disruption of the bonds or attractions occurs during protein hydrolysis or protein denaturation.
Answer:
The disruption of the bonds or attractions occurs during protein hydrolysis which results in the loss for the primacy structure. The peptide bonds is the bond affected in this scenario.
The disruption of the bonds however only exist in the process of denaturation and this results in a change in the confirmation which could be secondary, tertiary, and quaternary structural related. And example of the bonds affected include salt bridges, disulfide bridges, hydrogen bonds etc.
What is the particle behavior of an liquid?
Answer: The particles are moving fast but close together.
Answer:
its in the explanation.
Explanation:
1.In liquids, particles are quite close together and move with random motion throughout the container. Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.
2.It assumes the shape of the part of the container which it occupies particles can move/slide past one another.
Hope this helps. :)
how many moles are in a 4.2 gram gold sample
Phosphoric acid, which is commonly used as rust inhibitor, food additive and etching agent for dental and orthopedic use, can be synthesized using a two-step thermal process. In the first step, phosphorus and oxygen react to form diphosphorus pentoxide:
P4(l)+ 5O2(g) → P2O5()
In the second step, diphosphorus pentoxide and water react to form phosphoric acid:
P2O5(g)+ 3H2O → 2H3PO4
Write the net chemical equation for the production of phosphoric acid from phosphorus, oxygen and water. Be sure your equation is balanced.
Answer:
P4(l) + 5O2(g) + 6H2O(l) → 4H3PO4(aq)
Explanation:
Step 1
P4(l)+ 5O2(g) → 2P2O5()
Step 2
2P2O5(g)+ 6H2O(l) → 4H3PO4(aq)
Overall balanced equation;
P4(l) + 5O2(g) + 6H2O(l) → 4H3PO4(aq)
Notice carefully that the correct coefficients were used to balance the equations and obtain the accurate overall reaction equation. All the steps involved were shown above. Reactants that occur on both sides cancel out and do not appear in the final equation.
What kind of metal is Cu?
Transition metal
Alkaline earth metal
Alkali metal
Answer: Transition metal
Explanation: Copper is definitely a transition metal because the Cu2+ ion has an incomplete d level.
8. Why is the magnetic force considered to be a noncontact force?
Answer:
Magnetic forces are non contact forces; they pull or push on objects without touching them. Magnets are only attracted to a few 'magnetic' metals and not all matter. Magnets are attracted to and repel other magnets.
Hope this helps!!!
Explanation:
You need to make 700 mL of a 2.8 M KOH solution. How many grams of KOH should you measure out to make the solution?
Please show steps solution for this question to get the answer.
Answer:
The answer is 109.76 gExplanation:
In order to find out the mass of KOH to be used we use the formula
m = c × M × vwhere
m is the mass
c is the concentration in mol/dm³
M is the molar mass
v is the volume in dm³
From the question
c = 2.8 M
v = 700 mL = 0.7 dm³
Mr( K) = 39 , Mr(O) = 16 , Mr(H) = 1
we have
Molar mass of KOH = 39 + 16 + 1
= 56 g/mol
So we have
m = 2.8 × 56 × 0.7
We have the final answer as
109.76 gHope this helps you
Thermal Energy moves from a colder region to a warmer region. *
True
False
False.
There is more thermal energy (faster moving particles) in a warmer region, so they spread out over time, warming up the other regions and losing energy.
Please mark as Brainliest.
Which is denser a liquid or solid why?
Answer:
Liquids are usually less dense than solids but more dense than air. Temperature can change a liquid's density. For example, increasing the temperature of water causes the molecules to spread farther apart. The farther apart the molecules are, the less dense the water is.
Answer:
Solids are usually much more dense than liquids and gases, but not always.
Explanation:
Mercury, a metallic element that is a liquid at room temperature, is denser than many solids. Aerogel, a very unusual human-made solid, is about 500 times less dense than wate
How is matter divided?
.
Ag+1, NO3-1
+
Na+1, I-1
->
Answer:
0.3+Na
Explanation:
During photosynthesis, plants and some other organisms use energy from the sun to convert (change): carbon dioxide (CO2) and water (H2O) into ____________ (O2) and __________ (C6H12O6)
Answer:
CO2 + H2O → O2 + C6H12O6
CO2 = carbon dioxide
H2O = water
O2 = oxygen
C6H12O6 = glukose
a 108ml sampl of gas has a mass of 77.96mg at a pressure of 1140mmhg and temperature of 183°c .what is the molar mass of the gas ?
Answer:
146.85 g/mol
Explanation:
PV=nRT
n=mass/molar mass
covert from mmhg to atm = 0.184 atm
convert from ml to L= 0.108 L
convert from degree C to K= 456.15 K
convert from mg to g= 0.07796g
then rearrange the formula:
n=PV/RT
=(0.184)(0.108)/(0.08206)(456.15)
n= 5.308*10^(-4)
rearrange the n formula interms of molar mass:
Molar mass= mass/n
=0.07796/(5.308*10^-4)
molar mass= 146.85g/mol
Answer:
Molar mass = 20 g/mol
Explanation:
Given data:
Volume of gas = 108 mL
Mass of gas = 77.96 mg (77.96/1000 = 0.08 g)
Pressure of gas = 1140 mmHg
Temperature of gas = 183°C
Molar mass of gas = ?
Solution:
First of all we will calculate the number of moles of gas.
PV = nRT
R = general gas constant = 0.0821 atm.L/ mol.K
Now we will convert the units and then we will put the values in formula.
Volume of gas = 108 mL× 1 L/1000 mL= 0.108 L
Pressure of gas = 1140 mmHg× 1 atm / 760 mmHg = 1.5 atm
Temperature of gas = 183+273 = 456 K
PV = nRT
1.5 atm ×0.108 L = n × 0.0821 atm.L/ mol.K ×456 K
0.162 atm.L = n ×37.44 atm.L/ mol
n = 0.162 atm.L/37.44 atm.L/ mol
n = 0.004 mol
Molar mass of gas:
Number of moles = mass/molar mass
0.004 mol = 0.08 g / molar mass
Molar mass = 0.08 g /0.004 mol
Molar mass = 20 g/mol
How is stress and strain related to elastic deformation?
Answer:
elastic materials like rubber have small k
Explanation:
is the change in length divided by the original length of the object.
Violet light has a wavelength of 4.50 x 10-12 m. What is the frequency?*
3 points
1.5 x10^20 1/s
0.0135 1/s
6.77x10^19 1/5
3x10^8 1/s
Green light has a frequency of 6.73 x 1014 1/s. What is the wavelength?*
3 points
2.24x10^6 m
4.46x10^-7 m
2.02 x 10^23 m.
4.95 x 10^-24 m
3 points
What is the energy (Joules) of violet light with a frequency = 3.43 x 10^14
1/s? *
4.54x10^-19 J
1.99x10^-25 J
1.93 x 10^-48 J
2.27 x 10^-19 J
Answer:
Frequency = 6.67x10¹⁹ s⁻¹
Wavelength = 4.46x10⁻⁷m
e = 2.27x10⁻¹⁹J
Explanation:
To convert frequency to wavelength and vice versa we use the equation:
Wavelength = Speed of light / Frequency
Speed ligth is 3x10⁸m/s
For a wavelength of 4.50x10⁻¹²m:
4.50x10⁻¹²m = 3x10⁸m/s / Frequency
Frequency = 3x10⁸m/s / 4.5x10⁻¹²m
Frequency = 6.67x10¹⁹ s⁻¹For a frequency of 6.73x10¹⁴s⁻¹:
Wavelength = 3x10⁸m/s / 6.73x10¹⁴s⁻¹
Wavelength = 4.46x10⁻⁷mAnd energy, e, from frequency, is obtained as follows:
e = h ₓ frequency
Where h is Planck's constant, 6.626x10⁻³⁴J*s
e = 6.626x10⁻³⁴J*s*3.43x10¹⁴s⁻¹
e = 2.27x10⁻¹⁹JI need help with this
Answer:
2 nitrogen molecules are present
1 oxygen molecule is present
1 n2o molecules are present
When does carbon dioxide absorb the most heat energy?
during freezing
during deposition
during sublimation
during condensation
Answer:
during sublimation
Explanation:
just took the test
An ion formed from an atom has a 1- charge. The number of electrons present in the ion is 36 and the number of neutrons is 46. Identify the element by typing the name. For example: Hydrogen or Sodium.
Answer:
Bromine can become an ion when it gains an electron. Br- is a negative ion. Its known as an anion. Bromine has 35 protons=35 electrons. one added electron gives it 36 electrons and it becomes an anion.
Explanation:
Bromine can have isotopes having 44 and 46 neutrons.
Time is always the same on the same line of latitude or longitude
Answer:
Longtitude
No explanation :)
Which statement BEST explains why the Moon is visible from the Earth?
1) The Moon reflects light from the Sun.
2) The Moon is always lit up by the Sun for us to see.
3) The Moon reflects light from the Earth.
4) The Moon produces its own light through radiation.
Answer: The answer is the ''The moon is always lit up by the sun for us to see.''
Explanation: The moon is directly illuminated by the sun.
You are given 3 liquid samples – A, B, C and told that one is water, one is ethanol, and one is ether (d=0.700 g/mL). Each sample is 10.0 mL. the masses are as follows: A = 10.0 g, B= 7.00 g, C = 8.00 g. Identify each of the substances using density problems.
Answer:
im just trying to get work done i will help u if i knew it
1. What is the problem in this activity?
2. Formulate your hypothesis. (List down at least 3 hypotheses)
3. What is the dependent variable?
4. What is the independent variable?
5. Analyze your results. Which type of liquid will prevent the apple from
turning brown?
a. lemon
b. milk
Hello. You forgot to say that this question is about the possibility of using some type of product that prevents cut apples from becoming darker.
Answer and Explanation:
1. The problem with this activity is "What can you put on an apple slice to keep it from turning brown?" The problem in a scientific experiment is the element that provides a question about what is being observed.
2. Hypotheses are assumptions made about what was observed, in addition, hypotheses can answer the question shown in the problem. In the case of apples, the hypotheses can be: "Lemon juice is the most efficient product in delaying the blackening of cut apples." "Water is inefficient in preventing blackened cut apples." "Milk accelerates the blackness of cut apples."
3. The dependent viable is one that needs to be influenced by another element to bring about a result. In the case of the experiment with apples, the dependent variable is the blackening rate of the apple slices.
4. The independent variable, on the other hand, refers to the element that does not need any influence to cause a result, on the contrary, this variable acts on the dependent variable, influencing it. In the case of this experiment, the independent variable is the types of liquid tested to delay the blackening of cut apples.
5. Lemon was the most efficient liquid. Probably this efficiency is related to the lemon's ability to decrease the strength of antioxidants, due to its very low pH.
Identify the oxidizing and reducing agent in the following reaction, and determine which element is oxidized and which is reduced. Fe2+(aq) + ClO2(aq) → Fe3+(aq) + ClO2–(aq) ClO2 is the reducing agent and Fe2+ is the oxidizing agent . Fe is oxidized and Cl is reduced. g
Answer:
Explanation:
Fe⁺²(aq) + ClO₂(aq) → Fe⁺³(aq) + ClO₂⁻(aq)
Here oxidation number of Fe is increased from +2 to +3 , so Fe is oxidised .
The oxidation number of Cl is reduced from + 4 to +3 so Cl is reduced .
So ClO₂(aq) is oxidising agent and Fe⁺²(aq) is reducing agent .