The temperature at thermal equilibrium : 16.1 °C
Further explanationQ absorbed = Q released
Heat can be formulated :
Q = m.c.Δt
c= specific heat, J/g°C
Δt = temperature different, C°
m= mass, g
Q water=Q substance
[tex]\tt 3500\times 4.18\times (t_2-15)=70\times 0.89\times (270-t_2)\\\\14630(t_2-15)=62.3(270-t_2)\\\\14630t_2-219450=16821-62.3t_2\\\\14692.3t_2=236271\\\\t_2=16.1^oC[/tex]
How does heat energy from the sun reach Earth?
A. Conduction
B. Radiation
C. convection
d. other
If a bug is traveling 5 meters across the floor in 5 seconds. How fast did it
travel?
Answer:
5 seconds
Explanation:
Speed x Time. So t=ds. t=51=5.
PLEASE HELP!! I GIVE BRAINLIEST
1)Which process represents chemical change?
A. A lake freezes over into ice.
B. A metal bar is rolled into a flat sheet.
C. Vinegar bubbles when baking soda is added. D. Sand, water, and salt combine to form a mixture.
2)Which process is an example of a physical change?
A. Carrots are cut into small pieces and mixed into a salad.
B. A peanut butter sandwich is eaten and broken down by enzymes in the stomach.
C Sodium metal and chlorine gas are combined to form sodium chloride, or table salt.
D. Sodium metal and water are combined to form a basic compound and a flammable gas.
3) Which of the following is a chemical change?
A. Water boiling
B. Paper being cut
C. Ice melting
D. rusting
4) Which of these is a clue that a chemical change has occurred?
A. A beaker suddenly becomes very warm when you mix two room-temperature it.
B. A liquid forms bubbles when it reaches a high temperature.
C. Water changes color when you add food coloring to it.
D. Sugar crystals disappear when dissolved in water.
5) To cause a chemical change in wood, you can ...
A. Break it.
B. Burn it.
C. Cut it.
D. Saw it.
6) Which of the following is not a good indication that a chemical change has occurred?
A. The formation of gases
B. A change in color
C. A scratched surface
D. The release heat or light
Answer:
1)C 2)B 3)D
Explanation:
1. The process represents chemical change is vinegar bubbles when baking soda is added.
2. The process is an example of a physical change is carrots are cut into small pieces and mixed into a salad.
What is physical and chemical change ?The appearance or form of matter changes during a physical change, but the type of matter in the substance does not.
A chemical change, on the other hand, changes the type of matter and creates at least one new substance with new properties.
3. Rusting is a chemical change.
4. A beaker suddenly becomes very warm when you mix two room-temperature it is a clue that a chemical change has occurred.
5. To cause a chemical change in wood, you can burn it.
6. A scratched surface is not a good indication that a chemical change has occurred.
Thus, The process represents chemical change is vinegar bubbles when baking soda is added.
To learn more about the physical and chemical change, follow the link;
https://brainly.com/question/11321843
#SPJ5
What is the difference between oxygen-16 and oxygen-18
Answer:
Oxygen 16 has 8 protons and 8 neutrons while Oxygen 18 has 8 protons and 10 neutrons . These are isotopes of oxygen i.e same no. of protons but different no. of neutron .
Hope You Understood .
The process of generating electricity from dams and nuclear power plants is very different, but some of the energy transformations are the same. Which energy transformations occur in both dams and nuclear power plants? Check all that apply.
Answer:
Kinetic energy to mechanical energy, and mechanical energy to electrical energy.
Explanation:
From the Law of conservation of Energy, which state that energy can neither be created nor destroyed but can be transformed from one form to another. Energy transformation is essential in science and technology, in the process of generating electricity from dams and nuclear power plants
some of the energy transformations are the same, the energy transformations occur in both dams and nuclear power plants is Kinetic energy to mechanical energy, and mechanical energy to electrical energy. Kinectic energy is the energy in motion which means the dams is a running water and posses a Kinectic energy then it's is been convert to mechanical energy (which is the macroscopic energy) then to electrical energy by producing light.
Answer:
Explanation:
Kinetic energy to mechanical and mechanical to electrical
HELP ME PLEASE URGENT:
1. What can be concluded about the properties of the elements that border this staircase on the Periodic Table of the Elements?
A. These elements are metals.
B. These elements are liquids.
C.These elements have properties of both solids and gases.
D.These elements have properties of both metals and nonmetals.
2.
Answer:
D. These elements have properties of both metals and nonmetals.
Explanation:
It can be concluded that the elements have properties of both metals and non-metals.
The elements that borders the ones described are both metals and non-metals. Most of these elements can be classified as metalloids.
On the periodic table, the elements around this region have properties of both metals and non-metals at certain temperature and pressure conditions.
Answer:
The answer is D
Explanation:
It can be concluded that the elements have properties of both metals and non-metals.
The elements that borders the ones described are both metals and non-metals. Most of these elements can be classified as metalloids.
On the periodic table, the elements around this region have properties of both metals and non-metals at certain temperature and pressure conditions.
3
Which statement best describes the difference between a mixture and a compound?
A Compounds are pure elements.
B Compounds contain elements chemically bonded together.
Compounds can be easily separated into distinct parts.
D
Compounds have multiple boiling points.
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Answer:
B
Explanation:
Compounds are substances that are formed by the chemical combination of two or more elements in fixed proportions, while mixtures are substances that are formed by physically mixing two or more substances.
There is a sample of rock with a volume of 8 cm^3 and a mass of 20 g. What is its density?
Answer:
156.07 lb/cu ft
Explanation:
why are lab rules important
Answer:
if we do not have lab rules then something could go wrong like we could die or like what happened right now CORONAVIRUS that is why lab rules are so important to prevent things like this from happening
How many moles are in 4.35 X 1024 atoms of Iron (Fe)?
Answer:
The answer is 7.23 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{4.35 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 7.225913...[/tex]
We have the final answer as
7.23 molesHope this helps you
What is the value of 100 ºC on the Kelvin scale? A. 100 K B. 273 K C. 373 K D. -373 K E. -300 K
Answer:
373.15 K
Explanation:
Given data:
Temperature in degree Celsius = 100°C
Temperature in kelvin scale = ?
Solution:
To convert the degree Celsius into kelvin scale we add the given degree Celsius into 273.15.
100°C +273.15 = 373.15 K
Answer:
C. 373K
Explanation:
9. Which of the following is correctly matched?
A. Gold: Element: Silver: Compound
B. Oxygen: Element: Water: Compound
C. Sugar: Element: Salt: Compound
D. Water: Element: Hydrogen: Compound
Answer:
B
Explanation:
Oxygen (O2) is made up of two oxygen atoms but, just of one kind of atom oxygen (O), So it's an element. Water (H2O) is made up of two hydrogen atoms (H) and one oxygen atom (O), so it's a compound
Water has a higher boiling point than expected because what?
Answer:
Water has strong hydrogen bonds between molecules. These bonds require a lot of energy before they will break. This leads to water having a higher boiling point than if there were only weaker dipole-dipole forces. Water also has a high specific heat.
Explanation:
Hope this helped it is what I could find!
Answer: Water has a higher boiling point than expected because hydrogen and oxygen form single covalent bonds. Molecules of water is bound together by strong attractions which needs high energy to break resulting to a higher boiling point of water than most substances.
Explanation: Water has strong hydrogen bonds between molecules. These bonds require a lot of energy before they will break. This leads to water having a higher boiling point than if there were only weaker dipole-dipole forces. Water also has a high specific heat.
How many TOTAL atoms are in the following molecule? NaHCO3
Answer:
NaHCO3 = No. of atoms are 1 sodium + 1 Hydrogen + 1 carbon + 3 oxygens = 6 atoms per molecule.
One hot day, after adding fertilizer to the soil for her flowers, Joann notices that their petals change from pink to purple. Intrigued, she stops to smell her flowers to see if their scent has changed.
Which indicates a chemical change in the scenario?
energy change
formation of a gas
color change
release of an odor
Answer:
in this scenario a color change occured.
How can the shape of a molecule determine its polarity.
Answer:
Letter D
Explanation:
How many grams are in 7.23 x 10^24 Al atoms?
Answer:
323.76 g
Explanation:
The number of grams of the given atoms of Aluminum is 323.73 grams.
The given parameters:
Atom of the Aluminum, = 7.23 x 10²⁴The number of grams of the given atoms of Aluminum is calculated as follows;
6.02 x 10²³ atoms of Aluminum = 27 grams7.23 x 10²⁴ atoms of Aluminum = ?[tex]= \frac{7.23 \times 10^{24} \times 27 \ g}{6.02 \times 10^{23}} \\\\= 323.73 \ g[/tex]
Thus, the number of grams of the given atoms of Aluminum is 323.73 grams.
Learn more about atoms of element here: https://brainly.com/question/6258301
What is the oxidation number for manganese (Mn) in the compound Mn2O7?
Answer:
Mn oxidation number is +7
Explanation:
(NH4)CrO7 correct name
Answer:
pubchem
Explanation:
i know i'm in college
but you can look it up
A student mixes 250 millimeters of a strong base with 100 millimeters of a strong acid. What will the result be?
- a weak base
— weak acid
- a stronger base
- a stronger acid
Answer:
A stronger base.
Explanation:
In neutralization reactions, when an acid is mixed with a base, both species react to different degrees that depends on the concentrations and volumes of the acid and the base. In this case the student mixes a strong base (250 mL) with a strong acid (100 mL), what will happen is that the substance that is going to predominate (strong base) will be the one that is in greater quantity than the other, so the solution will remain a strong base.
How many moles of Gold (III) sulfide must decompose to produce 4.32 moles of gold
metal given the reaction Au2S3 --> 2Au + 35
Answer:
2.16 moles of Au₂S₃ are decomposed.
Explanation:
Given data:
Number of moles of gold (III) sulfide decomposed = ?
Number of moles of gold metal formed = 4.32 mol
Solution:
Chemical equation:
Au₂S₃ → 2Au + 3S
Now we will compare the moles of Au₂S₃ with gold metal.
Au : Au₂S₃
2 : 1
4.32 : 1/2×4.32 = 2.16
2.16 moles of Au₂S₃ are decomposed.
What charge does nitrogen form when it satisfies the octet rule?
A: 3
B: -3
C: 5
D: -5
You found three bottles of unlabeled chemicals. Describe how you could easily relabel these three bottles
Which molecule is solid at Room temperature?
Answer:
you stink at
Explanation:
If a jet traces 395,000 meters in 9000 seconds. What was the speed of the jet?
Answer:
43.89 m/sExplanation:
The speed of the jet can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
d is the distance
t is the time taken
From the question we have
[tex]v = \frac{395000}{9000} = \frac{395}{9} \\ = 43.8888...[/tex]
We have the final answer as
43.89 m/sHope this helps you
what happens when you add a proton to a hydrogen atom
Answer:
The Hydrogen Atom
The atom consists of a proton and an electron held together by the electromagnetic force between the positively charged proton and the negatively charged electron. If we add a proton to the hydrogen nucleus we would get helium (a different element). Here are two common isotopes of helium.
which clue can be identify a chemical reaction as a replacemnt reaction
Answer:
Hello! Your answer is : Double replacement
Why do oceanographers take measurements of the conductivity of the
seawater?
A. Conductivity tells water temperature.
B. Conductivity can be used to calculate the salinity of the water.
C. Conductivity helps oceanographers avoid dangerous electricain
situations.
D. Conductivity tells how much marine life is in the water.
Answer:
B. Conductivity can be used to calculate the salinity of the water.
I am 100% sure this is the correct answer :)
What mass of water is required to react completely with 157.35 g CO2? (Molar mass of H2O = 18.02 g/mol; molar mass of CO2 = 44.01 g/mol)
157.35 g CO2 =
g H2O
Answer:
64.43
Explanation:
i just took it
Answer:
64.43 and the next one is 16.94 on edge 2020
Pb+feSO4 - pbSO4 + fe
Lead + Iron(II) Sulfate = Lead Sulfate + Iron
Lead - Pb
Plumbum Element 82 Bulk Lead 鉛 Lead (native) Lead-210 Pb-210 210Pb
Iron(II) Sulfate - FeSO4
Iron Sulfate (1:1) Iron(II) Sulfate (1:1) Ferrous Sulfate (anhydrous) Ferrous Sulfate Ferrous Sulfate (anh.) Iron(2+) Sulfate (anh.) FeSO4 Fe(II)SO4
Lead Sulfate - PbSO4
Anglesite
iron - Fe
Element 26 Fer 26Fe Eisen Ferrum Hierro Ferrum Metallicum 鐵