Which question can be asked to determine if a wave is electromagnetic or mechanical
Answer: The Answer is
Does it require medium to travel
Explanation:
Answer:
does it require a medium
Explanation:
trust me
Why is a telephone considered an example of matter?
Answer:
Matter is anything that is made up of atoms. Whether its a computer, a drink, a suitcase, a telephone, whatever.
If it has mass, if it occupies space, and if it has volume, then it is matter.
Also, matter comes in the form of solids, liquids, and gasses.
In this case, the telephone is a solid.
plzzz mark me brainliest if this helped :)
I need 3 more brainliests to become an expert
Answer:
Matter is anything that is made up of atoms.
Explanation:
If it has mass, occupies space, and has volume, then it is matter. Also, matter comes in the form of solids, liquids, and gasses. The telephone is a solid.
Which type of plant used light, feathered seeds?
What would a zebra be?
consumer
decomposer
producer
Answer:
Zebra- consumer
Tiger- consumer
Worm- decomposer
Tree-Producer
Molded bread- decomposer
Plant- producer
Answer:
Type of plant - Dandelion .Zebra is a Consumer .Explanation:
Dandelion plant produces light and feathery seeds .
Zebra consumes / eats grass so it is a consumer .
How do astronomers know about the future collision of Andromeda and the Milky Way?
A) All galaxies will collide at some point
B) The two galaxies have collided previously
C) Astronomers have observed their movements over time
D) The Milky Way has changed course to head toward Andromeda
Answer:
Astronomers have observed their movements over time
Explanation:
Just took the test!!!
The future collision of Andromeda and milky way are known by astronomers because ; ( C ) Astronomers have observed their movements over time
Andromeda also known as messier 31 is a spiral galaxy that appears as a milky blur when viewed from the earth and it is believed to be slightly over 2.5 million years old.
Astronomers predict that based on its movement and the movement of the Milky way there is most likely going to be a collision in future between the Andromeda and milky way.
Hence we can conclude that The future collision of Andromeda and milky way are known by astronomers because Astronomers have observed their movements over time
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A gas has a volume of 3.25 liters at 54 C and 231 kPa of pressure. At what temperature will the same gas take up 4.35 liters of space and have a pressure of 168 kPa?
Answer: 318 K
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 231 kPa
[tex]P_2[/tex] = final pressure of gas = 168 kPa
[tex]V_1[/tex] = initial volume of gas = 3.25 L
[tex]V_2[/tex] = final volume of gas = 4.35 L
[tex]T_1[/tex] = initial temperature of gas = [tex]54^oC=273+54=327K[/tex]
[tex]T_2[/tex] = final temperature of gas = ?
Now put all the given values in the above equation, we get:
[tex]\frac{231\times 3.25}{327}=\frac{168\times 4.35}{T_2}[/tex]
[tex]T_2=318K[/tex]
At 318 K of temperature will the same gas take up 4.35 liters of space and have a pressure of 168 kPa
Which word describes the amount of matter an object contains?
O altitude
Odensity
O mass
O pressure
What is the volume of the Earth in comparison to the Sun? How many Earths would
we need to equal the volume of the Sun?
Answer: The total volume of the sun is 1.4 x 10 27cubic meters. About 1.3 million Earths could fit inside the sun. The mass of the sun is 1.989 x 10 30 kilograms, about 333,000 times the mass of the Earth.
Explanation: So if you divide the volume of the Sun by the volume of the Earth, you get 1,300,000.
Chloroform is a commonly used anesthetic with a density of 1.483 g/mL. Determine the volume of chloroform needed to deliver a 9.37 g sample of the anesthetic
Answer:
The correct answer is 6.32 ml
Explanation:
We have the following data:
Mass : m = 9.37 g
Density : d= 1.483 g/mL
The density a substance is equal to the mass of the substance divided into its volume. So, we calculate the volume (V) of chloroform from the mass and density as follows:
[tex]d=\frac{m}{V}[/tex] ⇒ [tex]V = \frac{m}{d} = \frac{9.37 g}{1.483 g/ml} = 6.32 ml[/tex]
What is the formula for frequency?
Answer:
Frequency = Velocity / Wavelength
or
f = v / λ
Picture of 2010 Todd Abronowitz Gas Laws problems, super fun if you’re in AP chem. Can you help a pre-AP struggling student out please?
Answer:
1. 0.422 atmospheres
2. 633281.25 Pascals
3. (a) Move up
(b) 868 mmHg
4. 868 mmHg
5. 775 mmHg
6. Partial pressure of He is 0.64 atm.
Partial pressure of oxygen is 1.29 atm.
Partial pressure of N is 2.57 atm.
7. 445.72 torr.
Explanation:
1. To convert 321 torr to atmospheres
1 atmosphere = 760 torr
∴ 1 torr = 1/760 atmospheres
Hence, 321 torr = 321 × 1/760 = 321/760 atmospheres = 0.422 atmospheres
2. To convert 6.25 atmospheres to Pascals, we have;
1 atmosphere = 101325 Pascals
∴ 6.25 atmospheres = 6.25 × 101325 Pascals = 633281.25 Pascals
3. (a) Here we have, given that the value of the pressure on the bottle = 830 mmHg, when the valve is opened, the mercury in the open-end arm will move up because the pressure of the gas inside the flask is more than the pressure on the other side of the open-end arm
(b) After the mercury stops moving the difference between the two columns will be the difference between the two pressures, that is 830 mmHg - 745 mmHg = 85 mmHg
4. From the diagram, it is seen that the differenc beteen the two columns is 123 mm, therefore, the pressure in the flask is 123 mmHg more than the external pressure, hence the pressure of the as in the flask = 745 mmHg + 123 mmHg = 868 mmHg
5. Here we have that the height of the mercury in the open-end is less than the height of the mercury on the arm closer to the flask, therefore, the pressure of the gas in the flask = 825 mmHg - 50 mmHg = 775 mmHg
6. Number of moles of He = 1 mole
Number of moles of oxygen, O = 2 mole
Number of moles of nitrogen, N = 4 mole
From Dalton's law of partial pressure we have that, the total pressure of a given mass of gas is equal to the partial pressure of the individual gases
[tex]That \ is \ \chi _i = \frac{n_i}{n_{total}} \ and \ P_i = \chi_i \cdot P_{total}[/tex]
Hence;
Total number of moles = 1 + 2 + 4 = 7 moles
Mole fraction of He = 1/7
Partial pressure of He = 1/7×4.5 = 0.64 atm.
Mole fraction of oxygen, O = 2/7
Partial pressure of oxygen= 2/7×4.5 = 1.29 atm.
Mole fraction of N = 4/7
Partial pressure of N = 4/7×4.5 = 2.57 atm.
7. From Boyle's law
P₁×V₁ = P₂×V₂
Hence;
P₂ = P₁×V₁/V₂
Where:
P₁ = Initial pressure = 2.57 atm
V₁ = Initial volume =1.57 liters
V₂ = New volume = 6.88 liters
P₂ = New pressure = 2.57×1.57/6.88 = 0.59 atm.
To convert 0.59 atm. to torr, we multiply by 760 thus;
0.59 atm. = 0.59 × 760 torr = 445.72 torr.
Which of the following is the correct definition of conduction?
A.
the transmission of heat across empty space
B.
the electromagnetic radiation from the surface of an object which is due to the object's temperature
C.
the transfer of heat by currents within a liquid or gas
D.
the transmission of heat across matter
Answer:
the transmission of heat across matter
Explanation:
Conduction is the transmission of heat across matter. Even though heat flows across matter during conduction, the matter itself does not flow.
A student following the reaction seen here calculated a theoretical yield of 38.3g C₆H₅Cl but when he did the experiment in the lab he actually produced 36.8 g of C₆H₅Cl. What is the percent yield? *
Answer:
96.1 %
Explanation:
Which teacher do you have lol
Copper and silver are two examples of atoms that will form a(n) _____.
metallic bond
ionic bond
covalent bond
none of the above
Answer:
metallic bond but not completely sure
Explanation:
How many grams of H2 can be produced from the reaction of 11.50 g of sodium with an excess of water? The equation for the reaction is 2 Na + 2 H2O -> 2 NaOH + H2 Ans: 0.504 2 g H2 I would like to know how to solve this problem, the teacher gave me the answer but I am unsure how to solve it thanks!
Answer:
[tex]m_{H_2}=0.504gH_2[/tex]
Explanation:
Hello,
In this case, since the reaction is:
[tex]2 Na + 2 H_2O \rightarrow 2 NaOH + H_2[/tex]
We notice that since there is an excess of water, we can directly compute the yielded grams of hydrogen by using the following stoichiometric procedure, considering the 2:1 molar ratio between sodium and hydrogen (notice the 2 before the sodium and the 1 before the hydrogen at the chemical reaction) and that gaseous hydrogen has a molar mass of 2 g/mol:
[tex]m_{H_2}=11.50gNa*\frac{1molNa}{22.98gNa} *\frac{1molH_2}{2.02molNa} *\frac{2gH_2}{1molH_2} \\\\m_{H_2}=0.504gH_2[/tex]
Best regards.
Answer:
0.503g of H₂ are produced
Explanation:
Based on the chemical reaction:
2 Na + 2 H₂O → 2 NaOH + H₂
2 moles of Na react with 2 moles of water to produce 2 moles of NaOH and 1 mole of H₂
11.50g of Na -limiting reactant, molar mass 22.99g/mol- are:
11.50g× (1mol / 22.99g) = 0.500 moles of Na.
As 2 moles of Na produce 1 mole of H₂:
0.500 moles of Na × (1 mole H₂ / 2 moles Na) = 0.250 moles of H₂
As molar mass of H₂ is 2.01g/mol:
0.250 moles of H₂ × (2.01g / 1mol) = 0.503g of H₂ are produced
How much faster will Xenon escape out and opening than carbon dioxide gas?
gas with the smallest amount of molecular weight will effuse the quickest
Given:
CH4 + 2O2 → CO2 + 2H2O, ΔH = -890 kJ/mol
How much energy is released when 59.7 grams of methane (CH4) reacts with oxygen?
The combustion of 59.7 grams of methane releases ____ kilojoules of energy
Answer:
The combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy
Explanation:
Given;
CH₄ + 2O₂ → CO₂ + 2H₂O, ΔH = -890 kJ/mol
From the combustion reaction above, it can be observed that;
1 mole of methane (CH₄) released 890 kilojoules of energy.
Now, we convert 59.7 grams of methane to moles
CH₄ = 12 + (1x4) = 16 g/mol
59.7 g of CH₄ [tex]= \frac{59.7}{16} = 3.73125 \ moles[/tex]
1 mole of methane (CH₄) released 890 kilojoules of energy
3.73125 moles of methane (CH₄) will release ?
= 3.73125 moles x -890 kJ/mol
= -3320.81 kJ
Therefore, the combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy
Answer:
The combustion will release -3,321 KJ/mol of energy
Explanation:
Ca(OH)2
Name this compound according to IUPAC nomenclature.
A) calcium hydroxide
B) calcum oxide hydride
C) calcium (II) hydroxide
D) calcium (II) oxide hydride
Several atmospheric gases contribute to global warming: carbon dioxide, methane, and nitrous oxide. Considering this, which choice would do the LEAST to directly reduce atmospheric carbon dioxide.
Answer:
A
help u and it's A
Explanation:
When does boiling occur?
Water boils at 100 Degrees Celsius or 212 degrees Fahrenheit
The concentration of hydroxide ions is greater than the concentration of hydronium ions for acidic solution. True or false.
Answer: False
Explanation:
An acid is defined as the substance which looses hydrogen ion or hydronium ions when dissolved in water.
A base is defined as the substance which looses hydroxide ions when dissolved in water.
If the solution has higher hydronium ion concentration as compared to the hydroxide ion concentration, then the pH will be low and the solution will be acidic.
If the solution has low hydronium ion concentration as compared to the hydroxide ion concentration then the pH will be high and the solution will be basic.
in a titration 20.0 mL of 0.150 M NaOH(aq) Solution exactly neutralize is 24.0 mL of an HCl solution what is the concentration of the HCl solution
Answer:
0.125
Explanation:
i took a test and got it right choosing this answer hopes this help
can someone Fing answer this PLEASE! NOW
Chemical Reactions Performance Task
Description: A student conducted two different demonstrations in their science class that started with copper chloride (CuCl₂). They have provided you with the following data tables to help you determine if a physical change or chemical reaction occurred during the demonstrations.
Demonstration 1:
Reactants
substances at beginning of reaction
Products
substances at the end of the reaction
Substance
(Chemical Formula)
Copper Chloride
(CuCl₂)
Water
(H₂O)
Copper Chloride
(CuCl₂)
Water
(H₂O)
Properties
Density: 2.51 g/cm³
Melting Point: 100ºC
Boiling Point: 993ºC
Density: 1 g/cm³
Melting Point: 0ºC
Boiling Point: 100ºC
Density: 2.51 g/cm³
Melting Point: 100ºC
Boiling Point: 993ºC
Density: 1 g/cm³
Melting Point: 0ºC
Boiling Point: 100ºC
Based on the patterns (similarities and differences) in the properties of the reactants and products in the table above, is this a physical or chemical reaction? Cite specific evidence from multiple properties in the data table to support your answer. (5pts)
Claim
Evidence
Reasoning
Demonstration 2:
Reactants
substances at beginning of reaction
Products
substances at the end of the reaction
Substance
(Chemical Formula)
Copper Chloride
(CuCl₂)
Iron
(Fe)
Iron Chloride
(FeCl₂)
Copper
(Cu)
Properties
Density: 2.51 g/cm³
Melting Point: 100ºC
Boiling Point: 993ºC
Density: 7.86 g/cm³
Melting Point: 1538ºC
Boiling Point: 2682ºC
Density: 3.16 g/cm³
Melting Point: 677ºC
Boiling Point: 1023ºC
Density: 8.96 g/cm³
Melting Point: 1085ºC
Boiling Point: 2562ºC
Based on the patterns (similarities and differences) in the properties of the reactants and products in the table above, is this a physical or chemical reaction? Cite specific evidence from multiple properties in the table to support your answer. (5pts)
Claim
Evidence
Reasoning
Using the data from Demonstrations 1 and 2, fill out the table below to describe the difference between a physical and chemical reaction in terms of the rearrangement and/or conservation of atoms and molecules. Choose conserved or not conserved for atoms. Choose rearranged or not rearranged for molecules. (4pts)
Physical Changes
Chemical Reactions
Atoms:
(conserved/not conserved)
Molecules
(Rearranged/Not rearranged)
Answer:
Need to broken down more.
Explanation:
Answer:
its FIND NOT fing
Explanation:
Stabiliţi numerele de oxidare ale tuturor elementelor prezente în următoarele substanţe chimice, ţinând cont de principalele reguli de stabilire a NO: ⦁ NaNO3 ⦁ AlPO4 ⦁ CaCO3 ⦁ KMnO4 ⦁ K2Cr2O7 ⦁ HClO4 (acid percloric) ⦁ HClO3 (acid cloric) ⦁ HClO2 (acid cloros) ⦁ HClO (acid hipocloros)
Answer:
a.
N = +2
O = -2
b.
Na = +1
O = -2
N = +5
c.
O = -2
Al = +3
P = +5
d.
O = -2
Ca = +2
C = +4
e
O = -2
Mn = +7
K = +1
f.
O = -2
K = +1
Cr = +6
g.
O = -2
Cl = +7
Cr = +1
h.
O = -2
H = +1
Cr = +5
i.
O = -2
H = +1
Cr = +3
k.
O = -2
H = +1
Cr = +1
Explanation:
A. NU
Numărul de oxidare a azotului = +2
Numărul de oxidare a oxigenului = -2
b. NaNO₃
Numărul de oxidare de Na = +1
Numărul de oxidare de O = -2
Numărul de oxidare de N = +5
c. AlPO₄
Numărul de oxidare de O = -2
Numărul de oxidare al Al = +3
Numărul de oxidare al P = +5
d. carbonat de calciu
Numărul de oxidare de O = -2
Numărul de oxidare de Ca = +2
Numărul de oxidare de C = +4
e. KMnO₄
Numărul de oxidare de O = -2
Numărul de oxidare al Mn = +7
Numărul de oxidare al lui K = +1
f. K₂Cr₂O₇
Numărul de oxidare de O = -2
Numărul de oxidare al lui K = +1
Numărul de oxidare al Cr = +6
g. HClO₄
Numărul de oxidare de O = -2
Numărul de oxidare al Cl = +7
Numărul de oxidare al Cr = +1
h. HClO₃
Numărul de oxidare de O = -2
Numărul de oxidare al lui H = +1
Numărul de oxidare al Cr = +5
i. HClO₂
Numărul de oxidare de O = -2
Numărul de oxidare al lui H = +1
Numărul de oxidare al Cr = +3
k. HClO
Numărul de oxidare de O = -2
Numărul de oxidare al lui H = +1
Numărul de oxidare al Cr = +1.
what are the rules for calculating protons
Answer:
Find the element,
Explanation:
Finding the element will tell you how many protons there are. For example, if you are given an atom of oxygen, you can figure out the number of protons by looking it up on a periodic table, which gives you 8.
If an atom is neutral, find the number of electrons. This number will also be the number of protons.
Can someone help me with this?
Answer:
D) condensing C) boiling
If the following weights have masses of 2, 4, 6 and 8 kg,
respectively, and they are at the same temperature, which one
will transfer more heat if they are all placed in cold water to
cool down? Explain.
Unit is calorimetry
Answer:
8 kg mass
Explanation:
As we can see in the image the weight of mass 8 kgs has a large surface area as compared to the surface area of other masses. In general, it has been observed that a wide surface area has more surface particle for heat conduction. Hence, the rate of heat transfer is directly proportional to the surface area of heat conducting surface. Thus, the larger the surface area, the faster is the rate of heat conduction.
Hence, weight of mass 8Kg wil transfer heat a fast rate.
3. The organelle that produces materials that need to be released from the cell
is the:
A. storage granule
B. microvilli
C. chloroplast
D. vacuole
4. An organelle found in plant cells, fungi, and some protists, animal cells, and
bacteria is the:
A. storage granule
B. microvilli
C. chloroplast
Dvacuole
what does Reproducibility mean? Plz help me
Answer:
the ability to be reproduced or copied.
Explanation:
Answer: the ability of an entire experiment or study to be reproduced, either by the researcher or by someone else working independently.
Which of the following statements is NOT true?
A. The corn that we grow today has not changed since prehistoric times.
B. Early humans planted seeds from corn plants with large kernels.
C. It took many generations for corn plants to change.
D. Humans have selectively bred many different types of crops.
Answer:
A. Corn has changed over time due to selective breeding.
Hope this helps :)
A solution has a [H3O+] of 1x 10-5 M. What is the [OH-] of the solution? (5 points)
9M
14M
1x 10-'M
1x 10-14M
Answer:
1x10^–9 M
Explanation:
From the question given,
Concentration of hydronium ion, [H3O+] = 1x10^-5 M.
Concentration of Hydroxide ion, [OH-] =..?
The concentration of the hydroxide ion, [OH-] can be obtained as follow:
[H3O+] x [OH-] = 1x10^–14
1x10^-5 M x [OH-] = 1x10^–14
Divide both side by 1x10^-5
[OH-] = 1x10^–14 / 1x10^-5
[OH-] = 1x10^–9 M
The [OH⁻] concentration of the solution is 1 * 10⁻⁹M.
What is pH value ?pH value is the measure of the acidity and alkalinity of a solution , The pH value has the range of 0 to 14, where 0-7 is the range for acid , 7 is for neutral solution , 7-14 is for alkaline solution.
[H3O⁺] = 1* 10⁻⁵ M
We can calculate the value of OH⁻ concentration by using the formula
[H⁺][OH⁻] = 1* 10⁻¹⁴
1* 10⁻⁵ * [OH⁻] = 1* 10⁻¹⁴
[OH⁻] = 1 * 10⁻⁹
Therefore the [OH⁻] concentration is 1 * 10⁻⁹M .
To know more about pH value
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