Answer:
a vaccine is a needle they give in your arm.
Explanation:
How does the author build understanding of body odor?
Explanation:
because the author create that body odor to people who read the things like story to they feel like hopeless
42. Balance the equation below. What is the coefficient for HCI?
Help me please don’t answer then delete I will report u
Answer:
Mg + 2HCl ⇒ MgCl₂ + H₂Coefficient of HCl = 2Explanation:
Equation (given) :
Mg + HCl ⇒ MgCl₂ + H₂Compare the LHS and RHS :
On the left side, there are only single atoms of H and Cl, whereas there are 2 of each on the right sideAs HCl is a single compound on the left, multiply HCl into 2 to balance the reactionCoefficient of HCl = 2Balanced Equation :
Mg + 2HCl ⇒ MgCl₂ + H₂If a reactant is in excess, why do we not worry about the mole ratios involving that reactant?.
Answer: The limiting reactant will be used up first, meaning the reaction can no longer occur with only the excess reactant.
Explanation:
In a reaction the reactant which determines the yield of the reaction is called limiting reactant. Whereas, the reactant which is excess in amount does not itself lead the reaction after the limiting reactant is consumed.
What is excess reactant?In a reaction, the yield of the product depends on the number of moles of reactants. The reactants which is not sufficient in amount is determining the yield because as soon as this reactant is consumed, the production stopes.
The excess reactant on the other hand is excess in amount which can't lead the reaction alone after the consumption of the limiting reactant. Hence, we don't have to worry on the excess reactant.
The limiting reactant of a reaction can be determined by calculating the number of moles of each reactants participating in it.
Find more on limiting reactant:
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What is the difference between ethanol and methanol.
You've found some fossil bones while digging in your backyard. Could they be dinosaur bones? Using carbon dating, you determine that 3% of the original radioactive carbon-14 is still radioactive. (The rest has decayed into nitrogen-14.) How many half-life cycles has it gone through?
The half-life of Carbon-14 is 5730 years. When did the animal die?
Answer:
5 is the first answer and 28,650 for second
how can coefficients be used to balnce a chemical equation?
How many ml of naoh was used to reach the equivalence point?
options:
10ml
20ml
25ml
50ml
A 2.75 M solution is diluted to 0.706 M, if the starting volume was 0.833L, what is the new volume?
Answer:
3.2447
Explanation:
m1v1 = m2v2
How many atoms in Ga2Se3
The balanced equation shows how sodium chloride reacts with silver nitrate to form sodium nitrate and silver chloride. nacl agno3 right arrow. nano3 agcl if 4.00 g of nacl react with 10.00 g of agno3, what is the excess reactant? agcl nacl agno3 nano3
Answer:
The excess reactant is the NaCl.
Explanation:
NaCl(aq) + AgNO3 (aq) → NaNO₃(aq) + AgCl (s) ↓
This is a precipitation reaction.
We need to convert the mass of each reactant to moles:
4 g / 58.45 g/mol = 0.068 moles of NaCl
10 g / 169.87 g/mol = 0.059 moles of nitrate.
As stoichiometry is 1 by 1, 1 mol of chloride will react with 1 mol of nitrate.
If I have 0.059 moles of nitrate, I will need the same amount of chloride and I have 0.068 moles. I still have chloride, therefore the excess reactant is the NaCl.
0.068 mol - 0.059 mol = 0.009 moles are the moles of NaCl that remains after the reaction is complete
Answer:
NaCl
Explanation:
32
How many moles of Ca(NO) are there in a sample with a mass of 50.0 g?
a. 0.305 mol
b. 0.333 mol
c.
0.490 mol
d. 8200 mol
Answer:
0.305 mol
Explanation:
Ca(NO) is not a molecule. I think you meant to type Ca(NO3)2, which is calcium nitrate.
The moles of a compound is equal to is mass divided by its molar mass.
The molar mass of Ca(NO3)2 is 164.09 g/mol.
50.0 / 164.09 = 0.305
How many moles of carbon dioxide are produced if 50.0 L of oxygen is used?
NaOH (aq) + CuSO4(aq) →
balance the equation.
The elements of a group have the same number of ___________________ in their ______________ shell
Answer:
Same amoung of electrons in their outer shell
Explanation:
elements in the same group have the same number of electrons in their outer shell this is why they are in the same group
The elements of a group have the same number of valence electrons in their outermost shell.
Why do the elements of the same group have similar chemical behavior?The chemical properties of elements are described by the number of valence electrons in their outermost shell. The chemical elements placed in the same group have the same number of valence electrons in their valence shell. Therefore, the chemical elements placed in the same group of the periodic table have similar chemical behavior.
The elements having identical valence electronic configurations in their atoms are arranged in the same group of the modern periodic table. These valence electrons are accountable for the chemical properties and reactivities of the elements.
For example, the chemical properties of all elements in group 1 are similar as they have only one electron in their valence shell. The chemical elements of group 17 have seven electrons in their valence shell they are halogens with similar chemical behavior.
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What is the Mass of 1 mole of N2? Show your work
Answer:
28 g/mol
Explanation:
since the atomic weight of Nitrogen is 14 you take the amount of it and multiply it by that so in this case it would be this equation:
14 x 2 = 28
What is the total heat energy required to
raise the temperature of 10g of liquid water
from 20 degrees Celsius to 150
degrees Celsius?
Answer: 200 j
Explanation:
When ammonium chloride is dissolved in water, the beaker gets cold. Which type of reaction does this describe?
exothermic
endothermic
both exothermic and endothermic
neither exothermic nor endothermic
A gas at 200 Celsius and 10.0L expands to 20.0L. What is the new temperature in Celsius
Answer:
400celcius
Ex:
200 per 10.0L
400 per 20.0L
In a reaction the ->
means
Answer:
the arrow (single arrow) means that all the reactants are going to products.
What is the pH of a solution whose [H⁺] is 2.7 x 10⁻⁴ M?
Answer:
Here is the solution..Hope it helps:)
Most scientists use scientific methods in which of the following orders
Answer:
Experiment, analysis, research, purpose, hypothesis and conclusion.
The attraction of hydrogen to oxygen in a water molecule has unequal sharing of electrons, caused by a(n) _____.
A. metallic bond
B. nonpolar covalent bond
C. covalent bond
D. ionic bond
E. polar covalent bond
Answer:
c
Explanation:
got it right on my test
Answer:
The answer is: C aka covalent bond
Explanation:
Happy to help
What does the shape of the moon we see depend on?
The position of the moon during its orbit around Earth
The position of the moon during its orbit around Jupiter
The position of the moon during its orbit around Mars
The position of the moon during its orbit around Saturn
Answer:
The position of the moon during its orbit around Earth
Answer:
the angle you look at it from
How many milliliters of a 0.1000 M NaOH solution would be needed to neutralize a 1.0000-g sample of potassium hydrogen phthalate (KHC8H4O4) to a phenolphthalein endpoint, according to the following balanced equation?
KHC8H4O4(s)+NaOH(aq)------> KNaC8H4O4(aq)+H2O(l)
Answer: 2) 2HCl(sq) + CaCO3(s) CaCl2(sq) + CO2(g) + H2O (l) No of moles of CaCO3 = amount of the CaCO3 (g)/mw of CaCO3 (g/mole)= 0.8085 g/100 g/mole = 0.008085
Explanation:
Select all the following solutions that would be expected ph values for basic solutions?
ph 7
ph 9
ph 12
ph 5
ph 10
Answer:
9, 10, 12
Explanation:
anything greater than pH 7 is basic
salt seems to disappear when it is poured into water use the terms mixture solution and dissolve to explain what happens
Answer:
water acts as a solvent and dissolves the solute (salt) to produce a salt water solution
Explanation:
Acids which contain only hydrogen and a single other element are referred to as.
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A binary acid is an acid that consists of hydrogen and one other element.please help, will give brainliest
Answer:
See explanations and answers below
Explanation:
From the equation each mole calcium bromide makes 2 moles sodium bromide
1) 5 x 2 = 10 moles sodium bromide
2) 2 moles of calcium bromide will make 2 moles of calcium sulfate ( from the equation)
mole weight of calcium sulfate =
Ca = 40 S = 32 O4 = 64 total mole weight = 136 gm
two moles would weigh 272 gms
3) 845 gm of calcium sulfate is 845 gm / 136 gm/mole = 6.21 moles
6.21 moles of Ca Br2 will be needed
6 .21 ( 40 + 2 *79.9) = 1240.76 gm
Please help asap!!!!!!!!!!!
Answer:
B
Explanation:
Where velocity doesn't change, THERE IS NO ACCEL....this is section B
Base your answer to the question on the information below given the reaction at equilibrium2NO2(g)+7H2(g)->-< 2NH3(g)+4H2O(g)+1127kJ which diagram below correctly shows the potential energy diagram for the forward reaction, including the activation energy and the potential energy of the products?
Answer: 1
Explanation:
Heat is being released, so the energy of the reactants is less than the energy of the products.
