Answer:
Biological Evidence
Explanation:
Both blood and sweat are fluids within the body, therefore, both are biological substances.
Calculate the number of moles of NaCl contained in 2.6L of a 3.2M solution.
Concentration
mol (n)= M x V
[tex]\tt n=3.2\times 2.6=8.32[/tex]
Converting 53.3g of oxygen to moles will give you???
0.30 mol O
8.5 mol O
3.33 mol O
5.3 mol O
Answer:
3.33 mol
Explanation:
1 g of oxygen is 0.062502343837894 mol
53.3 * 0.062502343837894
3.3313749265597505 mol
In an experiment to estimate the enthalpy change of a reaction, a student makes two aqueous solutions, each containing one of the reactants. The student combines the solutions, both originally at the same temperature, in a calorimeter and records the final temperature of the mixture. In addition to the masses of the solutions and the temperature change of the mixture, which of the following pieces of information does the student need to calculate the enthalpy change of the reaction? why?
A) The boiling point of the reaction mixture
B) The heat of fusion of the reaction mixture
C) The density of the reaction mixture
D) The specific heat capacity of the reaction mixture
Based on the formula for calculating quantity of Heat, the student requires the mass, temperature change and the specific heat capacity of the reaction mixture.
What is enthalpy change of a reaction?The enthalpy change of a reaction is the amount of heat evolved or absorbed when reactant molecules react to form products.
In the use of a calorimetry to determine the enthalpy of a reaction, the law of conservation of energy is applied.
Heat lost = Heat gainedThe quantity of Heat is calculated using the formula below:
Quantity of Heat = mass × specific heat capacity × temperature cahangeTherefore, in addition to the masses of the solutions and the temperature change, the student requires the specific heat capacity of the reaction mixture.
Learn more about enthalpy change at: https://brainly.com/question/14291557
To balance this equation, how many NaBr are need
NaBr + Ca(OH)2 Cabr2 + NaOH
What are household items that are made up from carbon?
Which two of the following substances dissolves to a significant extent in water?
1. N2
2. C6H6
3. Na2SO4
4. NaCl
Answer: NaCl and Na2SO4
Explanation: sorry if its wrong
i need help yall ill mark brainliest :)
Answer:
How does non-human life in an urban ecosystem differ from that in an undeveloped forest ecosystem?
Explanation:
In forest eco system the people are uncivilized and not so much educated. And in urban eco system people are intelligent as well as educated this is the main reason. In an urban ecosystem, the only non-human life that live there are the ones that are able to survive under the conditions. However, in undeveloped forest ecosystems, there’s barely any pollution. Therefore, a bigger variety of non-human life is able to live here.
Mark brainliest if you can please :)
Hi anyone can help me do these questions,I will mark brainlest,Thank You.
Explanation:
a.
P. When potassium reacts with hydrochloric acid, the salt produced is potassium chloride and sulphur-di-oxide gas is evolved after performing these.
Q.Addition of acid with metal gives salt and hydrogen gas. When dilute Hydrochloric acid is added to iron filings, so chloride & hydrogen gas is produced.
R. and if you talk about gold, gold do not react easily with HCL
b.
# in ascending order P -> Q -> R
c.
# I think its potassium chloride reaction.
hope this helps you
have a great day :)
SOMEONE HELP ME PLEASE
Mass and energy are cycled around us all the time. What do you think your role is in the cycling of energy? Where do you get energy from and where does the energy go?
Answer: Our energy supply comes mainly from fossil fuels, with nuclear power and renewable sources rounding out the mix. These sources originate mostly in our local star, the Sun. Electricity falls into its own category because it's an energy carrier and not a primary source.
Explanation:
Answer:
Our primary energy source is fossil fuels, with nuclear power and renewable energy sources rounding out the mix. These sources are mostly derived from our nearest star, the Sun. Electricity is classified separately because it is an energy carrier rather than a primary source.
Explanation:
I had that question before it was hard good luck :D
A 36-gram sample of water has an initial temperature of 22°c. After the sample absorbs 1200 joules of heat energy, the final temperature of the sample is.
Answer:
≈29.94 [°C].
Explanation:
all the details are in the attachment, the answer is underlined with orange colour.
Help! Hurry! I will mark brainliest if you get it correct. NO SPAM!!!!!!!!
S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O
In the above equation how many moles of water can be made when 134 grams of HNO3 are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Answer:
S + HNO3 = H2SO4 + NO2 + H2O
Explanation:
Answer:
Based on stoichiometry HNO3 to H2O is 6:2
Use 9 grams to find the moles of HNO3
9 grams/63g/mol=0.143 moles of HNO3
HNO3:H2O
6:2
0.143*2/6=0.048
H2O moles is 0.048moles
Mass of water =0.048moles*18g/mol=0.864g
To the nearest tenth=0.9grams
Explanation:
I think this is right
gosh i rly need help in the previous questions I asked and no one answered I wish I was smart to answer them alone why am I d.umb
Answer:
gonna check them rn :) youre not d u mb dont worry (:
Balance the equation:THANK U IF U FIND IT!!
Answer:
[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]
Explanation:
Here a reaction is given to us and we need to balance the equation . The given reaction is ,
[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]
So here , we can make a table as ,
[tex]\begin{array}{c|c} \\ LHS & RHS \\\\ Zn = 1 & Zn = 1 \\\\ SO_4 = 1 & SO_4 =1\\\\ Li = 2 & Li= 2 \\\\ CO_3 = 1 & CO_3 = 1 \end{array}[/tex]
We can see that the number of elements and ions is same on both LHS and RHS . Hence the reaction is already balanced .
Therefore the final reaction would be same as before that is ,
[tex] ZnSO_4 + Li_2CO_3 \longrightarrow ZnCO_3 + Li_2SO_4 [/tex]
I hope this helps .
Which statement is correct? 22 points
Nearly all mutations are good.
Nearly all mutations are harmful.
Most mutations produce no effect.
what happens to the average kinetic energy of ideal gas molecules when the pressure of the gas is increased by reducing the volume at constant temperature
Answer:
The pressure of the gas is increased by reducing the volume at constant temperature. ... The average velocity of the molecules is increased by a factor of 2.
Explanation:
42. In order to turn on the light, a piece of wire
needs to be connected from
43. Which of the following energy conversions is
best illustrated by the diagram above?
how many moles are present in 132.7 grams of Cu
What is the percentage of oxygen in carbon dioxide.
List all types of bonding present in the molecule SO3.
I. ionic bond
II. polar covalent bond
III. nonpolar covalent bond
Sulfur trioxide (triangular planar) formed by double covalent bonds, is a compound that presents polar bonds although the dipole moments associated with each bond are canceled by symmetry, resulting in apolar molecules.
What is SO3?It is a nonpolar molecule that contains one sulfur atom bonded to three oxygen atoms.
Characteristics of the types of bonding present in the molecule SO3It is a molecule formed by covalent double bonds between S and O atoms, whose molecular formula is SO3.In SO3 there are three bonds between S and O, the first bond is formed by sharing two pairs of electrons (double bond), with this double bond the S and O complete the octet.S has two other pairs of electrons in the valence shell and gives each pair to two O atoms, thus completing its octet, forming two other bonds called dative covalent bonds.Therefore, we can conclude that SO3 is a nonpolar molecule due to its geometry (trigonal planar) and the absence of a lone pair of electrons.
Learn more about types of bonding present in the molecule SO3 here: https://brainly.com/question/17356017
which reaction type is the 3rd row?
Answer:
It's a combination reaction
[tex] \underline{ \underline{ \texttt{Combination reaction }}}[/tex]
What is combination reaction?
a reaction in which two reactants combine to form one product.
Why is it combination reation?
As you can see phosphorus and oxygen combined to form Phosphorus trioxide.
How many moles are in 96.0 grams of sulfur?
Answer:
There are 2.99 moles or 3 moles of Sulfur in 96 grams
Explanation:
You divide 96 by the atomic weight of Sulfur which is 32.065. For every 32.065 grams of Sulfur you will get 1 mole of Sulfur. The answer should be 2.99 or 3 moles of Sulfur.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
26.7% is the percent composition by mass of sulfur in a compound named magnesium sulfate. Explanation: Molar mass of compound = 120 g/mol.
What volume will 2. 0 moles of nitrogen occupy at 720 torr and 20. 0°C? Formula: PV = nRT (R = 62. 396 L•torr/mol•K) 3. 5 L 6. 6 L 48 L 51 L.
Answer:
the answer is 51 L please brainliest
Explanation:
The volume of 2. 0 moles of nitrogen at 720 torr and 20. 0°C is 51 L
Finding volume of Nitrogen
Using the formulae, PV=nRT
Recall that
1 torr= 0.00132atm
Such that
P=720torr =720 x 0.00132atm= 0.95atm
Also,
V= 20°C= 20+273= 293K
R=0.08206L-atm/mol-K
Solving, we have that
PV=nRT
0.95×V= 2×0.08206×293
V= 2×0.08206×293/ 0.95
V= 50.62L
Rounded to 51 L.
Learn more on finding volumes here:https://brainly.com/question/15338871
difference between---
soap and detergent
Answer:
"Soaps are made from natural ingredients, such as plant oils (coconut, vegetable, palm, pine) or acids derived from animal fat. Detergents, on the other hand, are synthetic, man-made derivatives. While soap is limited in its applications, detergents can be formulated to include other ingredients for all sorts of cleaning purposes. Perhaps the most common and versatile of these ingredients are surfactants … surface active agents.
The main difference between soap and detergent is the ingredients. Soaps are made with biodegradable ingredients such as oils, lye and fats. ... Both clean clothes well, but detergents are more effective on stains and with brightening clothes. However, soap is kinder on the environment and skin. "
Hope this helps
Excerpt from textbook
would you rather be hot or cold
Answer:
cold
Explanation:
because being cold helps to refresh my body personally
Answer:
hot
Explanation:
because I like to stay warm and take warm showers
A canoeist is paddling his boat, which is equipped with the necessary safety environment. Identify at least three synthetic fibres or plastics used in this case.
pls help me
Answer:
Nylon, Cabon Fibre, High-Density Polythene.
If You Like My Answer Mark It As Brainliest.
The three synthetic fibers or plastics used by the canoeist are:
Carbon FibreHigh-Density Polythene.NylonWhat are synthetic fibers?Synthetic fibers are defined as man-made textile fibers that are generated from chemical substances. Some of these man-made fibers are also derived from natural substances such as cellulose or protein.
Based on the given question, the three synthetic fibers or plastics used by the canoeist are:
Carbon FibreHigh-Density Polythene.NylonLearn more on synthetic fibers here; https://brainly.com/question/25834689
only Q4a, pls help i cant process this question
Explanation:
The group 2 ions are in the second column in the periodic table, for example Be, Mg and Ca
The group 3 ions are in the third column in the periodic table, for example B, Al and Ga
It's the same thing for the rest of the groups
Ions either lose or gain electrons to have a full outer shell, just like the noble gases
metal atoms lose electrons from their outer shell to form positively charged ions
From groups 1 to 3 the charge is the same as the group number
Non metals gain electrons on their outer shell to form negatively charged ions
From groups 5 to 7 the charge is 8 subtract the group number
Example: what is the charge for group 6 ions?
8 - 6 = 2, and the charge is negative so 2-
How many moles of O2 are required to react with 2.4 mol of H2 ?
Please explain your answer, I’m really trying to understand the concept!!!
Answer:
1.2 moles
Explanation:
this is the balanced equation for the reaction of oxygen (O2) and hydrogen (H2), usually we don't write the 1 in front of O2
2H₂ + 10₂ → 2H₂O
the molar ratio of hydrogen to oxygen is 2 : 1
we are trying to react with 2.4 mol of H2 so the moles of O2 is half the number of moles of H2 = 2.4 ÷ 2 = 1.2 mol
another way to think of it:
2H₂ + 10₂
2 : 1
2.4 mol : x mol
to get from 2 to 2.4 multiply by 1.2, so do the same to the other side
1 × 1.2 = 1.2 mol
The four nitrogen bases are thymine, cytosine, guanine, and adenine. True or false
Answer:
True
Explanation: