Explanation:
The trick here is to realize the every sample of sodium bromide, regardless of its mass, will contain
22.34
%
sodium by mass.
This is true because sodium and bromide always combine in definite proportions, i.e. stable ratios by mass, to form sodium bromide.
Now, a
22.34
%
percent concentration by mass means that every
100 g
of sodium bromide will contain
22.34 g
of sodium and
100 g
−
22.34 g
=
77.66 g Br
Therefore, you can say that the mass ratio that exists between sodium and bromine in any sample of sodium bromide will be
22.34 g Na
77.66 g Br
=
22.34
77.66
You can thus use this definite proportion to say that a
5.69 g
sample of sodium bromide will contain
5.69
g NaBr
⋅
22.34 g Na
100
g NaBr
=
1.271 g Na
=
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
∣
∣
a
a
1.27 g Na
a
a
∣
∣
−−−−−−−−−−−−−
The answer is rounded to three sig figs.
You can use the known definite proportion to find the mass of bromide present in the sample
1.271
g NaBr
⋅
77.66 g Br
22.34
g NaBr
=
4.42 g Br
This checks out because
mass of NaBr sample
5.69 g
−
mass of Na
1.27 g
=
mass of Br
4.42 g
The answers to your questions are ;
a) The mass percentage of Na in the sample will be higher in the sample
b) The mass percentage of Na in the sample will be be lower in the sample
Given that:
Mass percentage of sodium contained in sodium Bromide = 22.34%
a) Determine if the mass percentage of Na will be higher or lower when sodium Bromide is contaminated with sodium chloride
mass percentage of Na in sodium bromide
= ( mass of Na / mass of NaBr )*100
The mass of sodium in NaBr and NaCl is the same while the mass of Br is not same ( greater than ) as the mass of Cl. hence when NaBr is contaminated with NaCl the total mass of in percentage NaBr will decrease. and This decrease in mass of NaBr will lead to a decrease/lower mass percentage of Na in the sample
b) When NaBr is contaminated with NaI
The mass of Na is the same in NaBr and NaI while the mass of I is not the same ( greater than ) as the mass of Br, therefore the total mass will increase and the increase in the Total mass in percentage will lead to an increase/higher value of Na in the given sample.
hence the mass percentage of Na will decrease when NaBr is contaminated with NaCl while the mass percentage of Na will increase when NaBr is contaminated with NaI
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determine the empirical formula of the compound formed when 1.2g of magnesium reacts with 3.55g of chlorine.take the molar mass of magnesium and chlorine to be 24g and 35.5g.
Answer: MgCl2
Explanation:
Convert the masses of Mg and Cl to moles:
Mg: 1.2g/24g/mole = 0.050 moles
Cl: 3.55g/35.5g/mole = 0.100 moles
The ratio of Cl to Mg is 2 to 1: (0.100 moles Cl/0.050 moles Mg), Therefore there must be 2 Cl for every Mg:
MgCl2
This is the empirical formula since all we know is the ratio. If could also be Mg2Cl4, Mg3Cl6, etc, [i.e., (MgCl2)n]
Which shows an isomer of the molecule below?
Answer:
The answer is B, in this case.
Explanation:
An isomer is a molecule with the same number of atoms as another compound, but they differ in arrangement of the atoms.
Neha and Reha are playing see-saw. Neha is sitting 60 cm away from the fulcrum and Reha is sitting 40 cm away from the fulcrum. Calculate the effort that Reha should apply to lift Neha. The weight of Neha is 360 N.
Answer:
Reha should apply 540 N to lift Neha.
Explanation:
L = 360 N
LD = 60 m
E =?
ED = 40m
NOW
L * LD = E * ED
360 *60 = E*40
21600/40 = E
540 N = E
What is the chemical formula for glucose?
Answer:
C6 H12 O6
Explanation:
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The chemical formula for glucose is C6H12O6. This means that there are 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen in a single molecule.
QUESTION 8.1 POINT
Which volume is equivalent to 0.01 L?
Select the correct answer below:
O 10 dL
10 CL
10 KL
10 mL
Answer:
10 mL
Explanation:
1 L = 10^3 mL
0.01 L x 10^3 mL = 10 mL
Answer:
0.01 L=10ml
SEE the IMAGE FOR SOLUTION
what is a cavity in your own words
Answer:
A cavity is a hole in a tooth that develops from tooth decay Cavities are permanently damaged areas in the hard surface of your teeth that develop into tiny openings or holes .They are caused by a combination of factors, including bacteria in your mouth, frequent snacking, sipping sugary drinks and not cleaning your teeth well.
these are in my own words
What is the chemical formula for peracetic acid?
The chemical formula for peracetic acid is C2H4O3. This means that there are 2 atoms of carbon, 4 atoms of hydrogen, and 3 atoms of oxygen in a single molecule.
I think that the answer is C2H4O3.
Which of the following is the correct definition of density?
1. The amount of volume per given mass
2. The amount of space that an object occupies
3. The amount of mass per given volume
4. The amount of matter contained in an object
Answer:
3
Explanation:
The amount of mass per given vol
what is soil pollution
Answer:
Soil pollution is defined as the presence of toxic chemicals (pollutants or contaminants) in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem.
what is the chemical formula of ( methane ) ??
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what is the chemical formula of ( methane ) ??
» CH4[tex] \: [/tex]
--⚘ Mishi ChaeYoon ⚘--Answer:
[tex]CH_4[/tex]
Explanation:
Methane is a chemical compound with the formula CH4. ( One atom of carbon and four atoms of hydrogen).
------------------------
OAmalOHopeO
------------------------
h = 3.0 a + 28.2
A pediatrician uses the model above to estimate the height h of a girl, in inches, in terms of the girl's age a, in years. Based on the model, what is the estimated height of a 2-year-old girl?
Answer:
h = 34.2 in
Explanation:
h = 3.0a + 28.2
h = height of a girl.
a = age of a girl.
h = 3.0a + 28.2
h = 3.0(2) + 28.2
h = 6 + 28.2
h = 34.2
The estimated height of a 2-year-old girl is 34.2 in.
Hope this helps, thank you :) !!
Matter unit review? Chemistry
10 grade please help meeeeeeeeeee
what are some potential fire startersfor a wildfire
Diagram 1 shows the species of carnivore animal. (tiger)
What is the use of canine teeth for the animal?
a. Tear food
b. grind food
c. cut food
d. chewing and crushing food
Answer:
a no. because tearing the raw meat will not be easy without the use of the canine teeth
Science Laboratory Safety Procedures
1.
What items are you not allowed to consume during the lab?
How many bonds can a carbon atom form?
A. 3
O B. 4
C. 2.
O D. 1
Answer:
B)4
Explanation:
4. What is the main hydrocarbon component of natural gas? A. ethane
B. ethene C. methane
7.The fact that alpha particles cannot travel very far trough body tissues is the main reason that radioactive tracers use to detect diseases in internal organs emit beta particles or gamma rays.
A. true B. false
8.A wax is an ester of a long-chain fatty acid and a long-chain alcohol. A. true
B. false
Answer:
Q.4) C. Methane
Q.7) A. False
Q.8) A. True
Hot glass looks the same as cold glass?
Answer:
This is true. A hot glass does look the same as a cold glass. Glass won't change its look if it's below 648 degrees Celsius.
Which elements would react most easily with each other? (1 point) an element with a high electronegativity and an element with a single valence electron an element with a high electronegativity and an element with a single valence electron an element with a high electronegativity and an element with a full shell of electrons an element with a high electronegativity and an element with a full shell of electrons an element with a high electronegativity and an element with low reactivity an element with a high electronegativity and an element with low reactivity an element with a high electronegativity and a second element with a high electronegativity
Answer: The question is difficult to read. Please add numbered lines and check before uploading the question. I copied and organized the best I could, followed with my answers, below.
Explanation:
1. an element with a high electronegativity and an element with a single valence electron YES
2. an element with a high electronegativity and an element with a single valence electron Duplicate
3. an element with a high electronegativity and an element with a full shell of electrons NO
4. an element with a high electronegativity and an element with a full shell of electrons Duplicate
5. an element with a high electronegativity and an element with low reactivity NO
6. an element with a high electronegativity and an element with low reactivity Duplicate
7. an element with a high electronegativity and a second element with a high electronegativity NO
Elements have electronegativities because of the tendency of attracting electrons. An element with a single valence electron and high electronegativity will react with each other. Thus, option A is correct.
What is electronegativity?Electronegativity has been defined by the atom's tendency to attract the electrons that are in sharing for the formation of the chemical bond. The atomic number and the atomic radii affect electronegativity.
High electronegative elements are electron acceptors and are characterized by an almost full valence shell. The electron is required by them to achieve stability and complete octet. Elements with full shells cannot accept more electrons.
Therefore, option A. high electronegative element reacts easily with a valence electron to form a bond.
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What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) -> 35 (s) + 2H 20 (l)
A. Dehydrating agent
B. Oxidising agent
C. Bleaching agent
D. Acid
E. Precipitant
When salt dissolves completely into water, which term is used to describe the water?
Answer:
A salt that is dissolved in water is called a solute
Once you have dissolved the salt - you have a solution
The water is called the solvent
Explanation:
We have that When salt dissolves completely into water the water is called a Solvent
it is important to not that once the salt compound comes into water it breaks down the molecule apart the Na on one hand and the Cl on the other hand
Once the NaCl is dissolved in to the H_2O it is known as a solute of salt
And when When salt dissolves completely into water the water is called a Solvent
Therefore
When salt dissolves completely into water the water is called a Solvent
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Need the ionic formula
Answer:
To find the formula of an ionic compound, first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge. Finally, combine the two ions to form an electrically neutral compound.
Explanation:
This is a type of physical evidence that is present at the crime scene in very small quantities.
A. Trace Evidence
B. Indirect Evidence
C. Direct Evidence
D. Physical Evidence
which type of substance can separated using a centrifuge?
Answer:
Its separates the components of heterogeneous mixtures.
like examples :-
liquids in liquids, solids in liquids, solids and liquids in gases.
1How do you calculate magnification on a light microscope?
Pls help ASAP!!!
Based on patterns of the periodic table, which element is the least malleable in its solid state?
A. Strontium (Sr)
B. Copper (Cu)
C. Antimony (Sb)
D. Phosphorus (P)
Answer:
These are the answers for the Atomic Number Quick Check
Explanation:
1. An element is highly conductive, highly reactive, soft, and lustrous. The element most likely belongs to which group?: alkali metals
2. How does mercury differ from other metals?: It is not solid under normal conditions.
3. Based on patterns in the periodic table, which element is the least malleable in its solid state?: phosphorus (P)
4. In which group of elements does tellurium (Te) belong?: metalloids
5. Which statement describes the properties of lanthanoids and actinoids?: They are malleable and lustrous, and they tend to conduct both electricity and thermal energy.
Hope this helps :)
Based on patterns of the periodic table, the chemical element which is the least malleable in its solid state is: D. Phosphorus (P).
A periodic table refers to an organized tabular arrangement of all the chemical elements, typically arranged in order of increasing atomic number or number of protons (in rows).
Phosphorus is denoted by the chemical symbol P and it is a chemical element with an atomic number of fifteen (15) and as such it is found in group five (5) of the periodic table.
Malleability is one of the chemical properties of a chemical element and it is simply a measure of it softness such as when hammered.
According to trends (patterns) of the periodic table, Phosphorus (P) is the chemical element which is the least malleable in its solid state.
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am I right or am I wrong what answer is it
Answer:
you're righttttttttttttttttttttt
Answer:
yes because my class went over sum like that
Explanation:
Explaining or interpreting the things you observe based on reasoning from what you already know is called a. observing. c. predicting. b. inferring. d. classifying.
Answer:
B. inferring
Explanation:
1.
If a box has equal and opposite forces
acting on it, will the box accelerate?
oeste
Yes
No .
no, the box would not accelerate
_______is used for measuring mass.
Answer:
physical quantity is used for measuring mass.
have a great day God bless you