Answer:
84.2 degrees
Explanation:
Olaf the snowman has an heat capacity of ice while the coffee can be
assumed to have the same heat capacity of water.
The final temperature of ice is approximately -4.08 °CReasons:
The heat lost by the coffee = The heat gained by Olaf...(1)
ΔQ = m₁·c₁·(T₃ - T₁) = m₂·c₂·(T₂ - T₃)
Mass of the snowman, m₁ = 38 kg
Initial temperature of the snowman, T₁ = -4.2°C
Volume of coffee, V = 15 mL = 0.000015 m³
Initial temperature of the coffee = 80.0 °C
Specific heat capacity of the snowman, c₁ = 2.097 J/(g·°C)
Specific heat capacity of the coffee, c₂ = 4.187 J/(g·°C)
Latent heat of fusion of the coffee into ice = 334 J/g
Density of the ice, ρ₂ = 997 kg/m³
Solution:
Mass of the coffee, m₂ = 0.000015 m³ × 997 kg/m³ = 0.014955 kg = 14.955 grams
Heat given to convert the coffee to ice = 334 J/g × 14.955 g = 4,994.97 J
Heat given to cool the coffee to 0°C = 14.955×4.187×80.0 = 5009.3268
Heat given to cool the coffee to 0°C = 5,009.3268 J
Heat given to reduce the temperature of the coffee turned to ice is
presented as follows;
Heat to cool frozen coffee = 14.955 × 2.108 × T₃ = 31.52514·T₃
Heat gained by Olaf = m₁·c₁·(T₃ - T₁) = 38,000× 2.097 × (T₃ - (-4.2))
Which from equation (1) gives
4,994.97 + 5009.3268 + 31.52514·T₃ = 38,000× 2.097 × (T₃ - (-4.2))
Solving with a graphing calculator, gives;
T₃ ≈ -4.08 °C
The final temperature of Olaf, T₃ ≈ -4.08 °C
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how is sonoluminescence similar to what we see in fireworks?
Answer:
Explanation:
Sonoluminescence is a phenomenon in which small gas bubbles burst to produce light when intense sound wave is introduced. Thus, it can be said that sound energy is converted to light energy here. This is similar to the process of how fire crackers work except that sonoluminescence occurs in a liquid medium while firecrackers work in solid media. In firecrackers, when the tip is lit with fire, the initial explosion is caused by the expansion of some nitrogen and carbon present in some constituent compounds, this explosion produces heat which causes some other constituent chemicals in the firecracker to quickly react and produce light. Thus, this can also be said to convert sound energy to light energy and are thus similar to what occurs in sonoluminescence.
A solid is composed entirely of xenon atoms. What type of solid is it?
a) ionic
b) metallic
c) covalent network
d) atomic
e) molecular
f) amorphous
Answer:
ionic
Explanation:
xenom atoms are too large to move in the crystals without first associating with two oxygen ion vacancies and one uranium ion vacancy
What number do you never write as a coefficient?
Answer:
When no coefficient is written in front of a formula it is assumed to be 1. 4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.
Explanation:
1. Reactants go on the left hand side and products go on the right hand side of a chemical equation. Be sure to write the correct formulas for the reactants and products.
· Remember atoms are conserved in a chemical reaction. ie they are neither created or destroyed. So all the atoms in the reactants must end up somewhere among the products.
2. Count the number of atoms of each element, compound or ion in the reactants and products. If they are not equal proceed further.
3. Balance the atoms one at a time by placing coefficients in front of the formula so that the numbers of atoms of each element are equal on both sides of the equation. Remember atoms may exist in an element, compound or ion.
· It is usually easier to start with the atoms that occur in only one substance on each side of the equation.
· Balance the atoms that occur in compounds before attempting to balance atoms that occur in elemental form. e.g. H2, O2 or Cl2
· To make it easier if a polyatomic ion appears unchanged on both sides of the equation treat it as a whole unit.
· When no coefficient is written in front of a formula it is assumed to be 1.
4. Numbers appearing in the formulas are known as subscripts. These can never be changed when balancing the equation or you will change the identity of the substance.
· Remember with subscripts, any number to the right of parentheses multiplies each subscript within the parentheses.
eg Fe2(SO4)3 contains 2 Fe atoms, 3 S atoms and 12 O atoms.
5. Finally make sure that all the coefficients are in the smallest possible whole number ratio.
The number which we will never use as a coefficient in any chemical reactions are decimals and fractions.
What are coefficients?Coefficients are the numbers which are written before any chemical entity of any chemical reaction.
Coefficients of any reaction will not be:
Coefficient should always be a whole number.Decimal numbers or fractional numbers are not used as a coefficient.Coefficients are generally use for balancing the chemical reactions.
So, we will not use decimals and fractions as a coefficient.
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The Synthesis Reaction of aluminum (Al) and iodine (I) forms a new, more complex
product. What is the product?
Answer:
Aluminum iodide (AlI₃)
Explanation:
The synthesis reaction of aluminum (Al) and iodine (I) can be illustrated as shown below:
Aluminium exhibit trivalent positive ion (Al³⁺)
Iodine exhibit univalent negative ion (I¯)
During reaction, there will be an exchange of ion as shown below:
Al³⁺ + I¯ —> AlI₃
Thus, we can write the balanced equation for the reaction as follow:
Al + I₂ —› AlI₃
There are 2 atoms of I on the left side and 3 atoms on the right side. It can be balance by putting 2 in front of AlI₃ and 3 in front of I₂ as shown below:
Al + 3I₂ —› 2AlI₃
There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Al as shown below:
2Al + 3I₂ —› 2AlI₃
Thus the equation is balanced.
The product on the reaction is aluminum iodide (AlI₃)
What is the V2O5 coefficient??
Answer:
1235
Explanation:
if thers a a guess in that number
The compound V₂O₅ has a Seebeck coefficient at a temperature of 50 °C of -990 μV/K.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds .Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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#SPJ2
Can someone pls answer quickly?
answer is atom.Hope it is helpful.
Answer:
Atoms are the smallest particles that made up matter.
Speed of 5km. Pls help
Answer:
It's either A. or B. Im going with B. since the person is walking a constant speed
Explanation:
acceleration is basically when someone or something is increasing in speed
helppp mehhh thanks:))
Answer:
natural gas
Explanation:
your welcomeee
Based on the figure below, what do the elements of a group (family) have
in common
Answer:
Explanation:
Send figure below
2) Gas in a balloon occupies 3.3 L. What volume will it occupy if the pressure
is changed from 100 kPa to 90 kPa,
Answer:
The answer is 3.7 LExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{3.3 \times 100000}{90000} = \frac{330000}{9000 } \\ = 3.666666...[/tex]
We have the final answer as
3.7 LHope this helps you
State which statement is a physical change or a chemical change:
(a) Sawing wood
(b) Cooking eggs
(c) Melting chocolate
(d) Chewing sweets
(e) Rusting iron
(f) Filing your fingernails
(g) Milk turning sour
(h) Blow-drying your hair
(i) Boiling water
(j) Baking a cake
(k) Burning a match
Answer:
Physical change: A,C ,D, F, H, I
Chemical Change: B, E, G, J, K
In this periodic table, which type of element is shown in green boxes?
A. Noble gases
B. Metalloids
C. Nonmetals
D. Metals
The correct answer is B. Metalloids
Explanation:
In this periodic table, the green boxes include elements such as Boron (B), Arsenic (As), and Antimony (Sb). All these elements are known in chemistry as semimetals or metalloids. This classification is because these elements cannot be completely classified into metals or non-metals. Moreover, they all display similar properties including some level of conductivity, malleability, and solid-state. According to this, the correct answer is B.
Answer:
B. Metalloids
Explanation:
Li and S - covalent or ionic bond?
Answer:
It is an ionic bond.
Explanation:
Ionic bonds occur when a metal and a nonmetal combine, while covalent bonds occur between two nonmetals. Lithium is a metal and sulfur is a nonmetal.
Are ionic compounds not carrying a charge?
Answer:
yes they carry charges
A bad case of tonsillitis can sometimes affect a person’s breathing.How is this possible ?
Answer:
Tonsillitis is inflammation of tonsils. It is caused by viral infection and very rarely by bacterial infection.
It is a very serious problem in case of children, adults and teenagers. The continuous coughing can lead to swelling in the throat which in case affects the passage of airways.
This hindered air passage can cause breathing problems. The inflammation can also affect the passage of air and affects breathing.
Explanation:
. The model shows Earth in several positions relative to the Sun. In which position is it winter in North America?
Heeeeeelp will give brainliest
What is the total number of atoms in 36 molecules of glucose C6 (H2O) 6
Answer:
Explanation:
Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms.
what is the subscript of cl2
The three types of symbiosis are ___ and ___
Answer:
mutualism,commensalism and parasitism
Answer:
mutualism, commensalism, and parasitism
What is the enthaply of dissolution?
Answer:
The enthalpy change of solution refers to the amount of heat that is released or absorbed during the dissolving process (at constant pressure).
Explanation:
Compare an object sliding across carpet and that same object sliding across a bare floor. Why is the object quicker to slow down on carpet than on the bare floor?
The same object moves quicker through the bare floor than carpet as there has been no friction force acting on the object on the bare floor.
The friction force has been the force that has been applied against the motion of the object. The friction force has been created with the uneven surfaces that result in the slowing of the motion of the object.
The object has been slid against the carpet and the bare floor. The carpet has been the rough surface, that has been able to apply the friction force against the object.
The bare floor has been the smooth surface that has been able to slide down the object without the application of any friction force that has been able to move the object faster.
Thus, the same object moves quicker through the bare floor than carpet as there has been no friction force acting on the object on the bare floor.
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I need help I know it isnt A
3 way to make bases
I am a liquid metal with 80 electrons
Answer:
Mercury
Explanation:
Mercury is a liquid element that contains 80 electrons when not charged.
The number of elements in one molecule of H2O is
1) 5 elements
2) 5 atoms
3) 2 elements
4) 0 elements
Answer:
2 elements
Explanation:
There are the two elements that make water
Which of the following is true about mixtures and compounds?
OA. A mixture contains different substances that are not chemically combined with one another.
OB. A compound forms when different substances chemically combine to form a new substance.
OC. Mixtures and compounds are both made of two or more different substances.
OD. all of these
Answer:
All of the above
Explanation:
Convert 62.5 L to mm
3
Answer:
0.0625
Explanation:
Answer:
62,500
Explanation:
Which of the following is the best insulator?
Group of answer choices
copper
aluminum
gold
wood
Answer:
wood
Explanation:
hope this helps! good luck on ur test :)
Answer:
Wood
Explanation:
How many moles are in 2.99 x 10^24 atoms of Ca? (
answer. Keep 3 sigfigs in your final answer) *
Answer:
4.97 moles
Explanation:
There are 6.022*10^23 calcium atoms in 1 mole of Ca
2.99*10^24/6.022*10^23
=4.97 moles
Answer:
4.97 mol
Explanation:
Given data:
Number of atoms of Ca = 2.99×10²⁴
Number of moles of Ca = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.99×10²⁴ atoms × 1 mol / 6.022 × 10²³ atoms
0.497×10¹ mol
4.97 mol
Write a Formula
Compound Name: Strontium Sulfate
Answer:
it's SrSO4
Explanation:
