Answer:
a & b both are correct. But if you want only one answer, then it's 'a'
What's the charge on Ni in the compound NiCi3? *
+1
+2.
+3
- 7
-2.
3
you can't tell
Answer:
+3
Explanation:
Chlorine is anion with a -1 charge. But they are three chlorine atoms.
-1 * 3 = -3
So they have a -3 charge.
So to balance the compound, the nickel has to be a cation with a +3 charge.
-3 + 3 = 0
Furthermore, a chemical bond always has a 0 charge. Remember that.
Hope it helped! Rate my answer a 5 star if correct.
A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slightly reduced?
Answer:
Fewer bubbles will be produced because of fewer collisions of reactant molecules
Explanation:
As the solid dissolves into the solution after the liquid has been vigorously bubbled, if the temperature of the liquid is reduced a little, what will happen is that fewer bubbles will be produced as a result of lesser amount of collisions occurring between the reactant molecules
Give me 10 examples of entropy.
Answer:
A campfire is an example of entropy. The solid wood burns and becomes ash, smoke and gases, all of which spread energy outwards more easily than the solid fuel. Ice melting, salt or sugar dissolving, making popcorn and boiling water for tea are processes with increasing entropy in your kitchen.
Explanation:
If this helped you, the please mark me the brainliest.
Which of the following elements belong to the same group/family?
A. H and He
B. Li and Be
C. C and Pb
D. Ni and Ra
Answer:
C. C and Pb
Both are in group IV elements.
Quiestion 4
Based on your experimental data, which metal was likely used to make pennies after 1982?
Answer:
copper
Explanation:
i think it's copper because it's cheep and It exists in abundance
Calculate the density (in grams per milliliter) of the following gas at 97 °C and 755 mm Hg Sulfur dioxide (SO2)
Answer:
Density = 2.09×10⁻³ g/mL
Explanation:
We solve this problem from the Ideal Gases Law.
P . V = n . R . T
We know that in STP conditions 1 mol of any gas occupies 22.4 L. So we can compare both situations.
22.4 L = 22400 mL
(P₁ . V₁) / T₁ = (P₂ . V₂) / T₂
We make some conversions:
97°C + 273 = 370 K
755 mmHg . 1 atm / 760mmHg = 0.993 atm
We replace data: (1 atm . 22400 mL) / 273 K = (0.993 atm . V₂) / 370 K
((1 atm . 22400 mL) / 273 K) . 370K = 0.993 atm . V₂
V₂ = 30359 atm . mL / 0.993 atm → 30573 mL
Under those conditions (97 °C and 755 mm Hg) 1 mol of gas is contained in 30573 mL.
We determine the amount of gas: 1 mol of SO₂ weighs 64.06g
Density = m/V → 64.06 g / 30573 mL = 2.09×10⁻³ g/mL
Please select the word from the list that best fits the definition How far something moves in a specific amount of time
Answer:
Speed
Explanation:
That is what I believe the word to the definition, How far something moves in a specific amount of time, but you'd have to providea picture of the list of words for me to be sure...
A compound is found to contain 25.24 % sulfur and 74.76 % fluorine by weight. The molecular weight for this compound is 254.14 g/mol. What is the molecular formula for this compound
Answer:
[tex]S_2F_{10}[/tex]
Explanation:
Hello!
In this case, since the empirical formula of a chemical compound is determined by assuming the by-mass percentages are masses, we can firstly compute the moles of sulfur and fluorine based on their atomic masses:
[tex]n_S=25.24gS*\frac{1molS}{32.01gS}=0.789molS\\\\n_F=74.76gF*\frac{1molF}{19.00gF}=3.93molF[/tex]
Next, we compute the subscript of each element in the formula by dividing each moles by the fewest moles:
[tex]S=\frac{0.789}{0.789}=1\\\\F=\frac{3.93}{0.789} =5[/tex]
Whose molar mass is 127.01 g/mol. Now, we can compute the ratio between the molecular and empirical formulas as follows:
[tex]ratio=\frac{254.14}{127.01} =2[/tex]
Thus, the molecular formula is:
[tex]S_2F_{10}[/tex]
Regards!
I NEED HELP. This is about science
Answer:
independent varible
Explanation:
Heat energy can be transferred from a source to a receiver by
I. radiation.
II. convection.
III. conduction.
A.
I, II, and III
B.
II only
C.
I only
D.
III only
Answer:
It's I, II, and III
Explanation:
Trust me.
How many moles of Ca are in 1.25x1023 atoms?
We used two conversion factors in this unit, they are provided below. It is your responsibility to know which conversion factor to use!
Avogadro’s number: 6.02x1023 atoms = 1 mole
Molar mass of calcium: 40.078 g Ca = 1 mol Ca
A. 3.12x10^21 mol
B. 0.21 mol
C. 3.12 mol
D. 0.21x10^21 mol
B. 0.21 mol
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
1.25 × 10²³ atoms Ca
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 1.25 \cdot 10^{23} \ atoms \ Ca(\frac{1 \ mol \ Ca}{6.022 \cdot 10^{23} \ atoms \ Ca})[/tex]Multiply: [tex]\displaystyle 0.207572 \ mol \ Ca[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.207572 mol Ca ≈ 0.208 mol Ca
Sodium chloride can be produced by the reaction of sodium metal with chlorine gas. Which is the limiting reactant if 6.70 moles of Na reacts with 3.20 moles of chlorine gas
Answer:
Chlorine gas.
Explanation:
Hello!
In this case, the undergoing chemical reaction is:
[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]
Thus, given the moles of reacting both sodium and chlorine, we compute the moles of sodium chloride yielded by each reactant by considering the 2:2 and 1:2 mole ratios:
[tex]n_{NaCl}^{by\ Na}=6.70molNa*\frac{2molNaCl}{2molNa}=6.70molNaCl \\\\n_{NaCl}^{by\ Cl_2}=3.20molCl_2*\frac{2molNaCl}{1molCl_2}=6.40molNaCl[/tex]
Thus, since chlorine yields less moles of sodium chloride, we infer it is the limiting reactant.
Best regards!
yo please help. There is an image PLEASE... HELP... MEEEEE
Answer:
9. B different sounds the dog is exposed to
10. control, dependent, control, control, independent
Explanation:
classify the chemical equation CaCO3 → CaO + CO2
This is displacement reaction.
Loren is examining a hair found at a crime scene. He notes radical changes in the coloring of the hair. What is the term for this type of coloring?
Answer:
Granules of the hair cortex.
Explanation:
hope it helpfully...Answer:
It is banding for plato / edmentum
Explanation:
I took notes in the class and in my notes it says -
Human hairs have consistent coloring, whereas animal hair coloring may change radically. This radical change is called banding.
Ben observes how quickly some dry wood is burning in a campfire. Which term best relates to Ben’s observation?
Answer:
Reaction rate
Explanation:
We are told that Ben observes how quickly some dry wood is burning in a campfire.
This is an example of reaction rate because it tells us the speed i.e. how fast the dry wood is reacting with the camp fire.
Nicotine can be made when the following ammonium salt is treated with Na2CO3. Draw a stepwise mechanism for this reaction. N N N nicotine CH3 NH2CH3 Na2CO3 NaHCO3 NaBr
Answer:
Explanation:
The mechanism showing the process of the reaction is as follows:
From the given information, the starting compound includes a bromine atom & a protonated primary amine group. At the initial stage, dissociation of sodium carbonate occurs to form carbonate ions. This is followed by the attraction of a proton by the carbonate ion from the protonated amine group.
After that, there is a nucleophilic attack on the carbon atom at the nitrogen site by a bromine atom which results in the formation of a cyclic product. Finally, deprotonation of the nitrogen atom occurs to form Nicotine.
Answers: A-5N B-6N C-7N D-8N
Answer:
A-5N B-6N C-7N D-8NExplanation:
i hope it helps ;)
List 2 types of bacteria
"Spherical: Bacteria shaped like a ball are called cocci, and a single bacterium is a coccus. Examples include the streptococcus group, responsible for “strep throat.”
Rod-shaped: These are known as bacilli (singular bacillus). ...
Spiral: These are known as spirilla (singular spirillus). " - Medical News Today
prove that PV = nRT.
Find your answer in the explanation below.
Explanation:
PV = nRT is called the ideal gas equation and its a combination of 3 laws; Charles' law, Boyle's law and Avogadro's law.
According to Boyle's law, at constant temperature, the volume of a gas is inversely proportional to the pressure. i.e V = 1/P
From, Charles' law, we have that volume is directly proportional to the absolute temperature of the gas at constant pressure. i.e V = T
Avogadro's law finally states that equal volume of all gases at the same temperature and pressure contain the same number of molecules. i.e V = n
Combining the 3 Laws together i.e equating volume in all 3 laws, we have
V = nT/P,
V = constant nT/P
(constant = general gas constant = R)
V = RnT/P
by bringing P to the LHS, we have,
PV = nRT.
Q.E.D
Useful:
Harmful:
2. Give an example of how Bacteria can be useful and harmful to man.
Answer:
normal flora useful
Explanation:
protect the skin
Please help!!! I’ll mark brainlist
Explanation:
they are closer and made of gas
I promise it's easy points
Describe the life cycle of a star what determines the path a star could take.
Explain oscillation
Pls help ty!
Answer:regular variation in magnitude or position around a central point. Or movement back and forth at a regular speed
Explanation:
Answer:
movement back and forth at a regular speed
Explanation:
they be oscillatin
Which statement correctly describes the actual yield and the theoretical yield of a reaction? (1 point)
The actual yield is calculated from the reactant amounts, but the theoretical yield must be measured for each instance of a reaction
The actual yield is calculated from the amount of the limiting reactant, and the theoretical yield is calculated from the amount of the excess
The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts.
The actual yield represents the maximum yield possible, and the theoretical yield assumes perfect reaction conditions.
Answer:
C: The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts
Explanation:
Looking at the options, the correct one is Option C because the actual yield usually depends on the conditions of the reaction, while the theoretical yield usually varies with only the amount of reactant.
C(s)+H2(g)-> C2H6(g)
Explanation:
2 C(s) + 3 H2(g) = C2H6(g)
Which of the following statements about sidestream smoke is not true?
a. It is the smoke that a smoker inhales from a cigarette.
b. It is dirtier and has a different chemical makeup than mainstream smoke.
c. It is the smoke that people around the smoker inhale.
d. It is the smoke that results from the burning end of a cigarette.
Answer: a
Explanation: the smoker actually exhales the sidestream smoke
HELP PLEASE! Which of these is an example of the climate of a region?
Continental
Foggy
Overcast
Sunny
Answer:
Continential
Explanation:
foggy, overcast, and sunny are all examples of weather
White vinegar is a 5.0% by mass solution of acetic acid in water. If the density of white
vinegar is 1.007 g/cm3
, what is the pH?
The pH = 2.41
Further explanationGiven
5.0% by mass solution of acetic acid
the density of white vinegar is 1.007 g/cm3
Required
pH
Solution
Molarity of solution :
[tex]\tt M=\dfrac{\%mass\times \rho\times 10}{MW~acetic~acid}\\\\M=\dfrac{5\times 1.007\times 10}{60}\\\\M=0.839[/tex]
Ka for acetic acid = 1.8 x 10⁻⁵
[H⁺] for weak acid :
[tex]\tt [H^+]=\sqrt{Ka.M}[/tex]
Input the value :
[tex]\tt [H^+]=\sqrt{1.8\times 10^{-5}\times 0.839}\\\\(H^+]=0.00388=3.88\times 10^{-3}\\\\pH=3-log~3.88=2.41[/tex]
White vinegar is a 5.0% by mass solution of acetic acid in water and if the density of white vinegar is 1.007 g/cm³ then the pH of solution is 4.8.
How we calculate pH?pH of any solution will be calculated as:
pH = - log[H⁺], where
[H⁺] = concentration of H⁺ ions
In this question we will calculate the concentration of H⁺ ions as:
[H⁺] = √Ka.M, where
Ka = acid dissociation constant for acetic acid = 1.8 x 10⁻⁵ (known)
M is molarity and this can be calculated as:
M = (% mass × density × 10) / Molar mass of acid
Given that,
% mass = 5.0% by mass solution of acetic acid
density = 1.007 g/cm³
Molar mass of acetic acid = 60
Now putting all these values on the above equation, we get
M = (5 × 1.007 × 10) / 60 = 0.839
Now, we calculate the concentration of H⁺ ions by putting values on that equation as:
[H⁺] = √(1.8 x 10⁻⁵)(0.839)
[H⁺] = 1.5 x 10⁻⁵
So, pH of the solution will be calculated as:
pH = -log(1.5 x 10⁻⁵)
pH = -(-4.8)
pH = 4.8
Hence, pH is 4.8.
To know more about pH, visit the below link:
https://brainly.com/question/10313314
Is the cell wall factory part or worker? And please explain what the worker or factory part does. (Don’t tell me it’s on quizlet bc I can’t find it)