Answer:
26
Explanation:
26 because if you split 56.23 in half you get 26
i’m extremely stuck on this, please help
Answer:
ice: 2,100 J/(kg·K)
water: 4,200 J/(kg·K)
water vapor: 2,000 J/(kg·K)
basalt: 840 J/(kg·K)
granite: 790 J/(kg·K)
aluminum: 890 J/(kg·K)
iron: 450 J/(kg·K)
copper: 380 J/(kg·K)
lead: 130 J/(kg·K)
Explanation:
Specific heat is the amount of thermal energy you need to supply to a sample weighing 1 kg to increase its temperature by 1 K.
what will be seen when lithium chloride reacts with sulphuric acid?
Answer:
Lithium chloride react with sulfuric acid to produce lithium hydrosulfate and hydrogen chloride. ... Lithium chloride - solid. This reaction takes place at a temperature near 50°C.
hope it helps
plzzz mark as brainliest
Answer:
it changes in hydrogen chloride and sodium sulfate
Calculate the number of atoms in 2.5 moles of Si.
Answer:
[tex]\boxed {\boxed {\sf About \ 1.5 * 10^{24} \ atoms \ Si}}[/tex]
Explanation:
When converting from moles to atoms, we must use Avogadro's number. This number tells us there are 6.022 * 10²³ atoms in 1 mole. We can multiply this number by the number of moles.
First, we must set up Avogadro's number as a ratio.
[tex]\frac {6.022 \ * 10^{23} \ atoms \ Si }{1 \ mol \ Si}}[/tex]
Next, multiply the number of moles by the ratio.
[tex]2.5 \ mol \ Si *\frac {6.022 \ * 10^{23} \ atoms \ Si }{1 \ mol \ Si}}[/tex]
When we multiply, the moles of silicon will cancel.
[tex]2.5 * \frac {6.022 \ * 10^{23} \ atoms \ Si }{1}}[/tex]
Since the denominator of the fraction is 1, we can cancel it out too.
[tex]2.5 * {6.022 \ * 10^{23} \ atoms \ Si }[/tex]
[tex]1.5055 * 10^{24} \ atoms \ Si[/tex]
The original measurement (2.5 moles) has 2 significant figures (2 and 5). Therefore we must round to 2 sig figs. For this question, 2 sig figs is the tenth place.
The 0 in the hundredth place tells us to leave the 5 in the tenth place.
[tex]1.5 * 10^{24} \ atoms \ Si[/tex]
There are about 1.5 * 10²⁴ atoms of silicon.
i need help with question 16
plz help i’m timed!!!!!
Answer:
a
Explanation:
a
A chemist is conducting an experiment to find an enzyme that speeds up a reaction between Chemical A and Chemical B. The
chemist places Chemical A and Chemical B together in a beaker and then times how long it takes for the reaction to occur Next,
the chemist places the same amount of the two chemicals in a second identical beaker. The chemist adds an enzyme and then
times how long the reaction takes to occur
Did the chemist use adequate experimental controls?
Answer:
The correct option is;
C. Yes, the first chemical reaction (without the enzyme) acted as a control
Explanation:
A scientific control is a parallel observation or an experiment that serves as a measure to better improve the experimental result reliability, by comparing the outcome of the control experiment or observation with the outcome of the other observations or measurements to which has been applied an experimental treatment.
A beam of light exhibits diffraction when it passes through a small opening.
Which model of the nature of light does this example support?
A. The interference model
B. The wave model
C. The diffraction model
D. The particle model
Answer:
The wave model
Explanation:
Answer:
The wave model
Explanation:
Pls answer this question and have a great day:)
Answer:
its umm 4321
Explanation:
there u add
4+3+2+1 ok
As you have seen, ozone is formed in the upper atmosphere through the reaction:
O(g) + O2(g) → O3(g)
Data has shown that this is first order with respect to oxygen atoms and first order with respect to diatomic oxygen. Write the rate law equation for this reaction.
The rate law equation for Ozone reaction
r=k[O][O₂]
Further explanationGiven
Reaction of Ozone :.
O(g) + O2(g) → O3(g)
Required
the rate law equation
Solution
The rate law is a chemical equation that shows the relationship between reaction rate and the concentration / pressure of the reactants
For reaction
aA + bB ⇒ C + D
The rate law can be formulated:
[tex]\large{\boxed{\boxed{\bold{r~=~k.[A]^a[B]^b}}}[/tex]
where
r = reaction rate, M / s
k = constant, mol¹⁻⁽ᵃ⁺ᵇ⁾. L⁽ᵃ⁺ᵇ⁾⁻¹. S⁻¹
a = reaction order to A
b = reaction order to B
[A] = [B] = concentration of substances
So for Ozone reaction, the rate law (first orde for both O and O₂) :
[tex]\tt \boxed{\bold{r=k[O][O_2]}}[/tex]
what happens to the yield of hydrogen if the reaction is carried out at a higher pressure but at the same temperature
Answer:
The yield of hydrogen decreases
Explanation:
The Haber process is exothermic. The equation of the Haber process is;
N2(g) + 3H2(g) --------> 2NH3(g) ΔH = -ve
Now, if we maintain a constant temperature, the number of volumes will affect the yield of products as follows;
The higher the pressure the lesser yield of hydrogen because the increase in pressure shifts the equilibrium position towards the right hand side.
Consider the two electron arrangements for neutral atoms A and B. What is the atomic number of A?
A - 1s2, 2s2, 2p6, 3s1
B - 1s2, 2s2, 2p6, 5s1
Answer:
A
Explanation:
Because I am right
Answer:
the atomic number is 11
Explanation:
pls help asap!!
If you fill a balloon with 6.83 grams of helium (He) gas, how many moles of helium are present in the balloon?
Answer: _____ moles (round to 3 sig figs)
Answer:
1.71 moles of helium are present in balloon
Explanation:
Given data:
Mass of helium = 6.83 g
Number of moles of helium = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of helium = 4 g/mol
by putting values,
Number of moles = 6.83 g/ 4 g/mol
Number of moles = 1.71 mol
Thus, 1.71 moles of helium are present in balloon.
How many grams of Mg(ClO3)2 are needed to make 1,500 mL of a 2.5 N solution ?
Answer:
33
Explanation:
10. Elements known for their limited chemical reactivity are
A) alkali metals
B) alkaline earth metals
C) halogens
D) noble gases
E) transition metals
If the statement is true, select True. If it is false, select False.
If a molecule contains polar bonds, the molecule may or may not be polar overall.
True
False
1. Is water an element ?
Answer:
That is a good question but water is not an element it's a compound.
Explanation:
High explosives will create what at the point of origin?
A. A mound of debris
B. A crater
C. A secondary explosion
D. A lack of hydrogen
Answer: A Crater
(took the test)
High explosives will generally create a crater at the point of origin.
Explosives and cratersExplosions have to do with volume expansion and the release of a high amount of energy.
Thus, materials that surround an explosive are usually ejected and displaced in the process of explosion.
The high-pressure gas and the shock waves generated when explosives explode cause grounds to deform, eject materials out of it, and scatter them all about. This results in the creation of a hollow structure known as craters in the ground.
More on craters can be found here: https://brainly.com/question/1184201
#SPJ2
Solid lead(11) carbonate reacts with a dilute solution of
nitric acid (HNO,) to give a solution of lead(II) nitrate,
carbon dioxide and water.
Answer:
PbCO₃ + 2HNO₃ –> Pb(NO₃)₂ + CO₂ + H₂O
Explanation:
From the question given above:
Solid lead (II) carbonate reacts with a dilute solution of nitric acid (HNO₃) to give a solution of lead (II) nitrate,
carbon dioxide and water.
The above can be represented in the equation form as follow:
PbCO₃ + HNO₃ –> Pb(NO₃)₂ + CO₂ + H₂O
Finally, we shall balance the equation as follow:
PbCO₃ + HNO₃ –> Pb(NO₃)₂ + CO₂ + H₂O
There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by putting 2 in front of HNO₃ as shown below:
PbCO₃ + 2HNO₃ –> Pb(NO₃)₂ + CO₂ + H₂O
Now, the equation is balanced.
5 A student finds the mass and volume of four mystery liquids. Liquid Mass (9) Volume (mL) W 5 5 х 6 2 Y 2. 1 Z 2 00 No The student knows that the density of water is 1 g/mL. Which of the four mystery liquids can be correctly identified as water? Density = Mass / Volume A w B X
Answer:
A. W
Explanation:
we know the equation Density = mass/volume ( D = g/mL ).
we know that the density of water is 1 g/mL.
Liquid W = 5g/5 mL = 1 g/mL
Liquid X = 6g/2 mL = 3 g/mL
Liquid Y = 2g/1 mL = 2 g/mL
Liquid Z = 8g/.2 mL = 40 g/mL
Answer: A. W because that liquid has the same density as water.
Hope this helps you.
Dilute hydrochloric acid was titrated with sodium carbonate solution. • 10.0 cm3 of 0.100 mol / dm3 hydrochloric acid were placed in a conical flask. • A few drops of methyl orange indicator were added to the dilute hydrochloric acid. • The mixture was titrated with sodium carbonate solution. • 16.2 cm3 of sodium carbonate solution were required to react completely with the acid. What colour would the methyl orange indicator be in the hydrochloric acid? Calculate how many moles of hydrochloric acid were used. Use your answer to (b)(ii) and the equation for the reaction to calculate the number of moles of sodium carbonate that reacted.
Solution :
It is given that dilute hydrochloric acid is titrated with sodium carbonate solution.
[tex]$10 \ cm^3 $[/tex] of a 0.100 [tex]$mol/dm^3$[/tex] of hydrocholric acid is used.
Thus, 10 mL of the 0.1 molar dilute hydrochloric acid is titrated with 16.2 mL of Sodium carbonate solution.
The equation would be :
[tex]$Na_2CO_3 (aq) + 2HCl(aq) \rightarrow 2NaCl(aq) + CO_2(g) +H_2O (l)$[/tex]
Now we know that that the
Molarity = [tex]$\frac{n}{v} \times 100$[/tex]
For hydrochloric acid solution,
[tex]$0.1=\frac{n}{10} \times 100$[/tex]
∴ n = 0.01 moles.
Now for one mole of [tex]$Na_2CO_3$[/tex], two moles of HCl acid is used.
For one mole of HCl, one-half mole of [tex]$Na_2CO_3$[/tex] is required.
Therefore, for 0.01 mole of HCl, we require 0.005 mole of [tex]$Na_2CO_3$[/tex].
Hence, 0.01 mole of hydrochloric acid and 0.005 mole of [tex]$Na_2CO_3$[/tex] solution is used.
The color turns red when methyl orange indicator is used in HCl acid.
Why are questions about philosophy or religion able to be answered through scientific inquiry Be specific and use examples to support your answer
Answer:
HI
Explanation:
a researcher wants to document the number of great white sharks that migrate near Australia over a specific period of time. Which statement describes a limitation the researcher might face?
Answer: The researchers may not be able to watch the entire area at once.
Explanation:
because!!!
What type of large molecule is responsible for repair and growth of cells?
a. proteins
b. carbohydrates
c. lipids
Answer:
The answer is a. proteins
Answer:
[tex]\boxed {\boxed {\sf A.\ Protein}}[/tex]
Explanation:
Macromolecules play many important roles in the body. Let's list the functions of proteins, carbohydrates, and lipids.
Proteins:
These molecules help with growth, building and repairing cells, transporting substances, and acting as enzymes or hormones.Carbohydrates:
These molecules are used for energy. They can provide quick energy, because they are easy to break down.Lipids:
These help store energy for later use, plus they are sometimes insulators and hormones.Based on the information, the molecule responsible for repair and growth must be protein.
How many grams are there in 35.1 moles of calcium (Ca)
Answer:
no idea
Explanation:
two elements X and Y have atomic no. 12 and 17 respectively. write the formula of the compound formed by their combination
Answer:
x is calcium and y is chlorine
these are the p block elements
calcium belongs 4 th period and chlorine belongs to period 3rd
they forms ionic bond
chemical formula is
Ca+2 Cl-
CaCl2
Explanation:
give me brainly hope i helped!!!
Which of these actions would increase heat transfer between two objects?
O establishing their thermal equilibrium
o increasing the area of their contact
O using objects with similar specific heats
O reducing the time of their contact
Answer:
B: Increasing the area of their contact
Can you people help me please
Is bacteria alive? What can bacteria do?
Answer:
yes, bacteria is alive because it can basically generate energy and including molecules to keep itself alive. There are sone bacteria that can help to digest food, destroy disease-causing cells, also giving the body its needed vitamins.
How many grams is cacl2are there in 2.5moles?
Answer:
277,46Explanation:
Answer:
There are 277.5 grams of CaCl₂ in 2.5 moles
Explanation:
The mass of a mole of a substance is known as its molar mass. It is defined as the mass of the amount of a substance which contains the elementary number of particles, 6.0 * 10²³.
The molar mass of calcium chloride, CaCl₂ is obtained by adding the sum of the atomic masses of the elements present in the compound.
Atomic mass of calcium, Ca, is 40 g/mol; atomic mass of chlorine, Cl, is 35.5 g/mol. Therefore, the molar mass of CaCl₂ = (40 + 2 * 35.5) g = (40 + 71) g = 111.0 g. Therefore, molar mass of CaCl₂ is 111.0 g/mol
Since there are 2.5 moles of CaCl₂ in the sample, its mass in grams = number of moles * molar mass of CaCl₂
mass in grams = 2.5 * 111.0 g = 277.5 g
Therefore, there are 277.5 grams of CaCl₂ in 2.5 moles
Diffusion and Organelle Retake Activity
(please finish in 5-9 minutes)
Question:
Fill in the blank
Water loves _____ and ____.
This means water will
move ______ the direction of the salt or sugar.
Answer:
wind and soil? north?
Explanation:
sample with masses 0.12g,1.8g, and 0.562g are mixed together the combind mass of the three samples expressed to the correct number of significant figures should be recorded as
Answer:
2.5 g
Explanation:
Given data:
Masses of sample = 0.12 g, 1.8 g, 0.562 g
Combine mass of samples = ?
Solution:
When we add or subtract the values the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.
0.12 g + 1.8 g + 0.562 g
2.482 g
In given three measurements 1.8 has less number of significant figure after decimal point which is only one digit. Thus the final value must contain one digit after decimal.
we will round of 2.482 g.
2.5 g
because the next digit after 4 is 8 that's why we will round 4 to 5.
