Answer:
1.023 J / g °C
Explanation:
m = 37.9 grams
ΔT = 25.0*C
H = 969 J
c = ?
The equation relating these equation is;
H = mcΔT
making c subject of formulae;
c = H / mΔT
c = 969 J / (37.9 g * 25.0*C)
Upon solving;
c = 1.023 J / g °C
I will give brainliest and so many points
Answer:are there any answer option? cause i know but i have to make sure
Explanation:
What charge does a covalent bond have?
the taste of acid is sour
yes the taste of acid is sour
Explanation:
the acid increase the hydrogen concentration, which provides more ions for the tongue. Because the tongue gains ions, it registers the flavor as sour.
A student dissolves 13. g of stilbene (C14H12) in 100. mL of a solvent with a density of 0.85 g/mL. The student notices that the volume of the solvent does not change when the stilbene dissolves in it.
Calculate the molarity and molality of the student's solution. Be sure each of your answer entries has the correct number of significant digits.
Answer:
Molarity = 0.72M
Molality = 0.85M
Explanation:
Molarity and molality are two measures of molar concentration, and they can be calculated as follows:
Molarity = number of moles/volume of solvent
Molality = number of moles/mass (kg) of solvent
Mole = mass/molar mass
Molar mass of stilbene (C14H12) = 12(14) + 1(12)
= 168 + 12
= 180g/mol
mole of stilbene = 13/180
mole = 0.072mol
Volume = 100mL = 0.1L
molarity = 0.072/0.1
Molarity = 0.72M
Molality = number of moles ÷ mass (kg) of solvent
To get mass of solvent, we use;
Density = mass/volume
Mass = density × volume
Mass = 0.85g/mL × 100mL
Mass = 85g
Mass in kg = 85/1000 = 0.085kg
Molality = 0.072/0.085
Molality = 0.847M
Molality = 0.85M
Which function is not associated with cartilage?
Answer:
Cartilage does not contain blood vessels (it is avascular) or nerves (it is aneural). Some fibrocartilage such as the meniscus of the knee does however have blood supply in part. Nutrition is supplied to the chondrocytes by diffusion.
Barium chloride solution was used to test for sulfate ions in the presence of dilute hydrochloric acid. What color precipitate would
form if sulfate ions were present?
Answer:
white
Explanation:
A white precipitate of barium sulfate forms if sulfate ions are present. The hydrochloric acid is added first to remove any carbonate ions that might be present - they would also produce a white precipitate, giving a false positive result. Barium nitrate solution can be used instead of barium chloride solution
true or false
sugar melting an example of oxidation
and
water evaporating
Answer:
false i think
Explanation:
pleaseeeeeeeeeeee help me asap
my question is
'Scientists believe another Pangea is in Earth’s future. Explain why the evidence of tectonic plate motion supports this belief.'
help please and thank you
Answer:
eu nu insteleg ce zite
Explanation:
Answer:
We know that the movement of tectonic plates is a continuous process. Divergent plates cause the ocean floor to expand. Because of slab pull, subduction, and other processes, the landmasses keep drifting. Because of these movements, continents are continually moving apart from each other. It’s possible that one day they will collide to form a giant landmass and become another Pangea.
Explanation:
here^^
1. What do microorganisms share in common?
Answer:
Bacterial species are typified by their diversity. There are three notable common traits of bacteria, 1) lack of membrane-bound organelles, 2) unicellular and 3) small (usually microscopic) size.
Explanation:
What Are the Characteristics Common to All Bacteria?
Single-Celled. Perhaps the most straightforward characteristic of bacteria is their existence as single-celled organisms. ...
Absent Organelles. ...
Plasma Membrane. ...
Cell Walls. ...
DNA.
Which of the following statements explains how the fossil record provides evidence that evolution has occurred?
Question 1 options:
A. The fossil record shows how the offspring of many different species are very similar
B. The fossil record shows the exact cause of physical and behavioral adaptations of organisms
C. The fossil record includes fossils of every organism that has ever lived
D. The fossil record shows how related organisms changed through evolution
What volume (in L) of water vapor will be
produced from the reaction of 24.65 L of oxygen?
2C2H6(g) + 702(g) —4CO2(g) + 6H2O(9)
Answer: 21.13 L of [tex]H_2O[/tex] will be produced from the reaction of 24.65 L of oxygen
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
[tex]2C_2H_6(g)+7O_2(g)\rightarrow 4CO_2(g)+6H_2O(g)[/tex]
According to stoichiometry :
7 moles of [tex]O_2[/tex] give = 6 moles of [tex]H_2O[/tex] vapour
[tex]7\times 22.4L=156.8L[/tex] of [tex]O_2[/tex] produce = [tex]6\times 22.4L=134.4L[/tex] of [tex]H_2O[/tex] vapour
Thus 24.65 L of [tex]O_2[/tex] produce = [tex]\frac{134.4}{156.8}\times 24.65=21.13[/tex] L of [tex]H_2O[/tex] vapour
21.13 L of [tex]H_2O[/tex] will be produced from the reaction of 24.65 L of oxygen
Answer:
21.13
Explanation:
What happens in a
neutralisation reaction.
Answer:
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. Salts are also formed in this reaction.
Explanation:
Which characteristic is true of sexual reproduction but not of asexual reproduction?
Answer:
Sexual Reproduction involves two different parties
Explanation:
Asexual is the opposite, so it uses no one else to reproduce
Answer:
Sexual reproduction produces diverse offspring .
Sexual reprodction produces more variations whereas asexual reproduction usually produces very similar organisms
Explanation:
The picture to the right is the crystal of a
diamond. Circle three individual atoms of
carbon
Are these the same type or different
atoms?
Answer:
Circle Any 3 Red Spheres
Explanation:
All of these atoms are Carbon (C), as diamond is a network solid composed entirely of Carbon. They are all the same.
pls help 6th grade science
Answer:
C.)
Explanation:
I also saw this question on Brainly! Hope this helps!
Help me out guys
:)
Answer:
2 chloride ion, Cl¯
Explanation:
The formula for calcium chloride is CaCl₂.
Next, we shall write the balanced dissociation equation for calcium chloride, CaCl₂. This is illustrated below:
CaCl₂ (aq) —> Ca²⁺ + 2Cl¯
From the balanced equation above,
We can see that calcium chloride, CaCl₂ contains 1 calcium ion, Ca²⁺ and 2 chloride ion, Cl¯.
Therefore, we can conclude that for every 1 calcium ion, Ca²⁺, there are 2 chloride ion, Cl¯.
What happens when the pressure of a gas is decreased?
A. The number of molecules increases.
B. The diffusion rate increases.
C. The temperature increases.
D. The volume increases.
Answer:
The combined gas law states that the pressure of a gas is inversely related to the volume and directly related to the temperature. If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase.
Explanation:
Answer:
D. The volume increases.
Explanation:
100%
KMnO4 + H2S + HCl KCl + MnCl2 + H2O + S8 Did Cl change oxidation number? Yes, no Did Oxygen change oxidation number? Yes, no Did H change oxidation number? Yes, no Did Mn change oxidation number? Yes, no Did S change oxidation number? Yes, no oxidizing agent = K, O, Mn, S reducing agent = Mn, H, Cl, S
Explanation:
KMnO4 + H2S + HCl --> KCl + MnCl2 + H2O + S8
Did Cl change oxidation number?
The oxidation number of Cl in Reactant side is -1
The oxidation number of Cl in product side is -1
NO
Did Oxygen change oxidation number?
The oxidation number of O in Reactant side is -2
The oxidation number of O in product side is -2
NO
Did H change oxidation number?
The oxidation number of H in Reactant side is 1
The oxidation number of H in product side is 1
NO
Did Mn change oxidation number?
The oxidation number of Mn in Reactant side is +7
The oxidation number of Mn in product side is +2
YES
Did S change oxidation number?
The oxidation number of S in Reactant side is -2
The oxidation number of S in product side is 0
YES
Oxidizing agent (element with decrease in oxidation number) = Mn
Reducing agent (element with Increase in oxidation number) = S
Chemical Reaction Type of reaction
2NaCl 2Na + Cl2 _________________________
CaCl2 + F2 CaF2 + Cl2 _________________________
AgNO3 + KCl AgCl + KNO3 _________________________
N2 + H2 2NH3 _________________________
C3H8 + 5O2 3CO2 +4 H2O _________________________
Answer:
Explanation:
2NaCl 2Na + Cl2 synthesis reaction
CaCl2 + F2 CaF2 + Cl2 oxidation-reduction
AgNO3 + KCl AgCl + KNO3 precipitation reaction
N2 + H2 2NH3 i dont know
C3H8 + 5O2 3CO2 +4 H2O Balanced Chemical Reactions and the Conservation of Mass
What is the systematic name and molecular formula of these two:
Answer:
2,4-di Ethyl-2-methylpentane
C10H22
3,4 dimethyl heptane
C9H20
Explanation:
1. What are commonly called as "shooting stars"?
A. asteroids
B. comets
C. meteors
D. meteorites
2. What are found in the circular or somewhat like "doughnut-shaped"
region between Mars and Jupiter?
A. asteroids
B. comets
C. meteors
D. meteorites
3. Which Near-Earth Objects (NEO) are found on the Kuiper Belt and Oort
Cloud?
A. asteroids
B. comets
C. meteors
D. meteorites
4. What are comets made of?
A. dust only
B. metal only
C. dust and metal
D. dust, metal, and ice
5. What do you call the shining "head" around a comet?
A. coma
B. crown
C. halo
D. ring
Answer:
I hope I can help you
I hope I can help you
is Fe2(CO3)3 soluble?
What is the molarity of a solution that has 2.87 moles of NaCl in 5020 mL of solution?
Based on graph 4 across a period the electronegativity
Calculate the new volume in liters of a 0.500 L water bottle at 25.0 degrees when the plastic bottle is submerged in ice water at 1.00 degree Celsius.
Answer:
0.02L
Explanation:
Using the formula V1/T1 = V2/T2
Given
V1 = 0.5L
T1 = 25 degrees
T2 = 1 degree
V2 =?
Substitute
0.5/25 = V2/1
Cross multiply
25V2 = 0.5
V2 = 0.5/25
V2 = 0.02L
Hence the new volume will be 0.02L
How many grams of Ag are produced if I start the reaction with 5.5 mol Cu?
Equation given:
Cu + 2AgNO3 -> 2Ag + Cu(NO3)2
Answer:
9.34 g Ag
Explanation:
The bonding and molecular polarity in a molecule of Cl2 is best described as...
a. non polar/polar
b. polar/polar
c. non polar/ nonpolar
d. polar/ ionic
Answer:
The bonding and molecular polarity in a molecule of CI2 is best described as palar / polar
I will give brainliest and so many points
the red is neutrons and the blue is protons...I'm pretty sure.
Answer:
Beryllium atom
Explanation:
4. A separating funnel can be used to separate a mixture of two________ liquids. *
a) miscible
b) homogenous
c) immiscible
d) distilled
Answer:
d) distilled
Explanation:
A separatory funnel, also known as a separation funnel, separating funnel, or colloquially sep Funnel and fractionating Funnel. , is a piece of laboratory glassware used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities.
Answer:
d) distilled
Explanation:
Correct!!!