Answer:
320J/g
Explanation:
Given parameters:
Mass of the liquid = 40g
Amount of heat added = 12800J
Unknown:
The heat of vaporization = ?
Solution:
The heat of vaporization can be related to heat added by the expression below;
H = mL
H is the heat added
m is the mass
L is the heat of vaporization
Insert the parameters and solve;
12800 = 40 x L
L = [tex]\frac{12800}{40}[/tex] = 320J/g
Why do electrons falling into different orbits give off characteristics wavelengths?
Explanation:
Because the difference in energy between orbits is different in different types of atoms, moving electrons between different orbits requires photons carrying different amounts of energy (different wavelengths).
A student wants to investigate competition between two organisms. For the investigation, it
is most important that the student should choose organisms that
O require the same resources.
O reproduce at the same rate.
O are both active during the day.
o have the same adaptations.
(help please!!! due today!!!)
Answer:
i think that the answer is B
Explanation:
If a student wants to investigate competition between two organisms in an ecosystem the organisms should have same adaptations and use same resources.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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What mass of oxygen reacts with 12g of magnesium?
Answer:
24g
Explanation:
2×12=24
1mole of Mg react with 2 mooe of O2
What does it mean when an element has no subscript in a chemical formula?
Answer:
the element has no subscript because it is only one atom of it
Explanation:
If there isn't a subscript, it's presumed that there is only one atom of that element present.
What is subscript?Subscript is defined as a character that is printed slightly below and to the side of another character, commonly a letter or a number. A subscript is a character that is printed slightly below and to the side of another character, commonly a letter or a number. Chemists frequently employ subscripts in their formulations.
There is no number written if there is just one atom. The number is given as a subscript after the atom if there are multiples of a particular kind of atom. The number on the right side of the symbol indicates how many atoms of that element are contained in the molecule. The atomic number of an element is shown as a subscript on the left-bottom corner of a stand-alone symbol.
Thus, if there isn't a subscript, it's presumed that there is only one atom of that element present.
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1. Which best represents a compound?
Answer:
D
Explanation:
The one that best represents a compound is answer "D" because you compounds are chemically bonded and are always together.
Which air is driest? Air Temp 30F Dew-point 29F, Air Temp 77F Dew-point 19F, Air Temp 66F Dew-point 60F, or Air Temp 50F Dew-point 36F
Answer:
Air Temp 77F Dew-point 19F
Explanation:
Quiz
The dew point can be described as the temperature required by the air to be cooled. The driest air will have a higher dew point, therefore, at an air temperature of 66°F and a dew point of 60°F. Therefore, option (C) is correct.
What is dew point?The dew point can be defined as the temperature at which air should be cooled to become saturated with water vapor assuming constant air pressure and water content.
Moisture capacity will decrease below the dew point. Airborne water vapor will condense to form liquid water or dew. Dew develops on the surface and occurs through contact with a cooler surface.
The dew point is called the frost point when the temperature is below the freezing point because frost is produced by deposition rather than a condensation of water.
The humidity also impacts the dew point. The dew point increases when there is higher moisture in the atmosphere. Therefore, the higher dew point refers to less humid air or drier.
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Which of the following happens to the particles when the temperature of liquid water drops?
kinetic energy decreases
kinetic energy increases and then decreases
kinetic energy increases
kinetic energy stays constant
Answer:
The Kinetic energy decreases
Explanation:
because the speed of the molecules slows down.
3. What is the electron configuration of the following elements?
Lithium
Calcium
Copper
Strontium
Potassium
sodium
Answer: Lithium ( 3),Calcium (20),Copper (29),Strontium (38),Potassium (19),Sodium (11)
Explanation:
If 10 cubic centimeters of a liquid has a mass of
70 grams, what is its density?
A. 0.7 g/cm3
B. 7 g/cm3
C. 70 g/cm3
D. 700 g/cm
Answer:
V = 10 m³
m = 70 grams
density = ....?
density = m/v
= 70/10
= 7 g/cm³ (B)
Plants prevent a) soil erosion by wind or water b) soil erosion due to a forest station c) The loosening of soil and they bind the soil with the help of the roots
Answer:
The loosening of soil and they bind the soil with the help of the roots
Explanation:
Here, we want to know how plants prevent erosion by wind or water.
The way they do this is by binding the soil with their roots such that it will not be easy for the erosion agent to erode the surface.
How they do this is by making sure that the soil
particles are binded together with their roots which helps to keep the particles of the soil intact and not eroded
Answer:
c
Explanation:
A massless length of twine can withstand a maximum tension of 490 N. The twine is used to spin a 28-kg ball in horizontal circular motion of radius 1.8 m. The ball is spun faster and faster until the twine breaks. What was the maximum speed of the ball?
7.2 m/s
3.2 m/s
5.6 m/s
11 m/s
Answer:
5.6 m/s
Explanation:
Which statement best describes two functions of blood?
Answer:
flows through your viens and moves to your blood vesils
Explanation:
its how blood operates
The three types of symbiosis are ___ and ___
Answer:
mutualism,commensalism and parasitism
Answer:
mutualism, commensalism, and parasitism
1375 J of heat energy are added to a 50.0 g sample of copper, which increases temperature from 22.8 C to 94.2 C. Calculate the specific heat of copper.
Answer:
0.385 J/g°C
Explanation:
Using the following formula, the specific heat of an elemental substance can be calculated:
Q = m × c × ∆T
Where;
Q = quantity of heat (J)
m = mass (g)
c = specific heat capacity (J/g°C)
∆T = change in temperature (°C)
Based on the given information, Q = 1375J, m = 50g, initial temperature = 22.8°C, final temperature = 94.2°C, c =?
Q = m × c × ∆T
1375 = 50 × c × (94.2 - 22.8°C)
1375 = 50 × c × 71.4
1375 = 3570c
c = 1375/3570
c = 0.3851
c = 0.385 J/g°C
help it's chemistry
Answer:
wavelength = wave velocity/frequency.
Explanation:
c
is a constant. It is usually given as
3.00
×
10
8
m/s or
3.00
×
10
10
cm/s rounded to three significant figures.
Wavelength is measured in meters, centimeters, nanometers, etc...).
Frequency has a unit of
1/s
which means
1
cycle per second. It is also given the unit Hertz (Hz) in honor of German physicist Heinrich Hertz who proved the existence of electromagnetic waves.
1
Hz
=
1/s
.
What is the correct name and HELPPP!!
What is the name and formula of an ionic compound containing the element with the
atomic number of 5 bonded to Carbonate? *
Boron Carbonide; B2(CO3)3
Boron Carbonate; B,CO,
Boron Carbide; B,CO,
Boron Carbonate; B2(CO3)3
Answer:
Boron Carbonate; B₂(CO₃)₃
Explanation:
For names, carbonide does not exist; that rules out the first option. Carbide refers to just a carbon atom, not carbon and oxygen as in the polyatomic ion carbonate. That rids us of the third option. We are left with boron carbonate with the formula BCO or boron carbonate with the formula B₂(CO₃)₃.
Recall the carbonate polyatomic ion's formula: CO₃²⁻
Thus BCO cannot be the formula.
Option 4 is your answer, Boron Carbonate; B₂(CO₃)₃.
To further check your answer, observe the oxidation states of boron and the polyatomic ion carbonate. Boron can exist in oxidation states of either 2+ or 3+, and carbonate is only 2-; in this formula, boron will exhibit a 3+ state to balance out with carbonate.
2x3+ = 6+; 3x2- = 6-
6+ + 6- = 0; balanced
what are green boxes on periodic tables
Answer:
The basic metal ones?
Explanation:
...
The reaction for the combustion of acetylene is shown. Explain why this reaction is a redox reaction by identifying the oxidation numbers that change, what is oxidized, what is reduced, and what happens to the electrons during the reaction. 2C2H2 + 5O2 → 4CO2 + 2H2O
Answer:
2 C2H2 (g) + 5 O2 (g) → 4 CO2 (g) + 2 H2O (l)
Explanation:
Redox reaction: In this type of reaction, oxidation and reduction reaction occurs simultaneously in same chemical reaction.
2C_2H_2+5O_2\rightarrow 4CO_2 + 2H_2O2C
2
H
2
+5O
2
→4CO
2
+2H
2
O
This reaction is a redox reaction :
Removal of hydrogen or addition of oxygen is termed as oxidation. in above reaction, removal hydrogen from acetylene gives carbon-dioxide.
Removal of oxygen or addition of hydrogen is termed as reduction. in above reaction, removal of one oxygen atom from oxygen molecule with addition of two hydrogen atoms gives water
The oxidation number of carbon in acetylene is -2.
The oxidation number of carbon in carbon-dioxide= +4
Oxidation number of carbon increases after the reaction which means that carbon is getting oxidized.
The oxidation number of oxygen in oxygen gas = 0
The oxidation number of oxygen in water = -2
Oxidation number of oxygen decreases after the reaction which means that oxygen is getting reduced.
The electrons released during oxidation are transferred to the species which are undergoing reduction reaction.
Answer:
Just put this, or something like it:
The oxidation number of carbon changes from -1 to +4.
The oxidation number of oxygen changes from 0 to -2.
Carbon is oxidized.
Oxygen is reduced.
Electrons are transferred from carbon to oxygen.
Explanation:
Question 2
1 pts
Which of the following bonding types requires a TRANSFER of valence
electrons between two or more atoms?
Covalent
o lonic
Hydrogen
O Metallic
Answer:
I want to say its Lonic Bonding.
Explanation:
Ionic bonding is the complete transfer of valence electron(s) between atoms.
what type of data do you need to find the density of an object
What is the molarity of a solution prepared by diluting 43.72 ml of 1.005 M aqueous K2CR2O7 to 500 ml
Answer:
43.72
Explanation:
that is the answer hope u liked it and I did this already along time ago
The molarity of the solution will be "0.088 M".
Given values are:
Volume,
[tex]V_1 = 43.72 \ ml[/tex][tex]V_2 = 500 \ ml[/tex]Molarity,
[tex]M_1 = 1.005 \ M[/tex][tex]M_2 =?[/tex]By using the Dilution principle, we get
→ [tex]M_2 = \frac{M_1 V_1}{V_2}[/tex]
By substituting the given values, we get
→ [tex]=\frac{1.005\times 43.72}{500}[/tex]
→ [tex]= \frac{ 43.9586}{500}[/tex]
→ [tex]= 0.088 \ M[/tex]
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PLEASE HELP A car burns gasoline to create hot air gas that expands to move the pistons in the engine, which causes the car to be able to move.
What energy transformations occur from the fuel to the movement of the car?
Thermal to mechanical
Thermal to chemical to mechanical
Chemical to thermal to mechanical
Chemical to electrical
Answer:
Chemical to thermal to mechanical
Explanation:
It is because gasoline is chemical energy which turns to thermal. Because it said hot gas which is thermal energy. Then it turns to mechanical for the car to even move.
All seeing eyes:
i know your answer it is the third one (C, chemical to thermal to mechanical)
Explanation:
my all seeing eyes know all the answers
Explain the relationship between protons and ionization energy
How many grams are in a 3.1E21 atom sample of vanadium
The half-life of carbon-14 is about ____________ years.
Fill in the blank.
Answer:
5730 years
Explanation: for more on radiocarbon dating.) and hence explain why the amount of carbon-14 in the sample decays by half over any period of 5730 years.
I WILL GIVE BRAINLIEST TO YOU IF YOU ANSWER THIS (I KNOW THE ANSWER, SO IF YOU SOLVED WRONG, I WONT GIVE BRAINLIEST) SO YOU BETTER GIVE CORRECT ANSWER OR IM NOT GOING TO GIVE BRAINLIEST
Answer:
Corona Virus outbreak
You can see protons yes or no
No. Not with the naked eye
Select the correct answer
Giving brainliest
Answer:
I'm gonna say A and B
Explanation:
Not sure though
Hope I helped :)
please someone answer and help :)
A voltmeter is a device that measures electricity. It can detect the amount of electricity between two electrodes when they are submerged in a solution, such as salt water. Describe how you would find the melting point and the conductivity of the white substances in the beakers. Then, explain how you could identify which substance is salt and which is sugar.
Answer:
Explanation:
To determine the melting point of the unknown white substances. A sample of each of the unknown can be placed in separate capillary tubes and then placed in an adjustable heat source (for example water bath). A thermometer is then placed in the heat source very close to the tube holding the sample. The temperature of the heat source will be adjusted until the solid substance in the capillary tube starts to melt, the temperature at this point is noted as the melting point.
To determine the conductivity of the white substances, an electrolysis experiment is done. A sample each of the unknown substances is dissolved in water. These aqueous solutions are prepared separately. Two electrodes (positively charged anode and negatively charged cathode) are dipped into each of these solutions and an electric current is passed through these solutions, from an energy source (such as batter), through the electrodes (with the electric current flowing from the anode to the cathode). A voltmeter is then connected to this set-up to determine if electricity is been passed through the individual solutions.
The substance that is the salt will be the white substance that has the higher melting point and conducted electricity in the electrolysis set up; this is because NaCl salt is an ionic compound which has a high melting point and conducts electricity when dissolved in water. While the white substance that had a lower melting point and did not conduct electricity will be the sugar; this is because sugar/sucrose is an organic substance that has a low melting point and does not conduct electricity when dissolved in water.