Need help with these two, solve only the ones you can though :D
Answer: 27 is A and 28 is C.
Explanation: I’ll explain 28 but not 27 because that’s just definitions.
In CuSO4 there is a Cu, an S, and 4 O molecules. Add them up you get 6.
What is one way forces act on atoms? A. Forces cause bonds to form. B. Forces make atoms bigger C. Forces add neutrons to nuclei. D. Forces create new atoms
Answer:
a. forces cause bonds to form
Directions: Drag each label to the correct location on the image.
A diagram of a plant cell is shown below. Each line on the diagram points to a different cell organelle. The labels shown each
describe the function of one of these organelles. Correctly match the cell organelles with their functions.
Answer:
........................................
Which describes an attribute of nonrenewable resources? exist in fixed amounts are unlimited can often be replaced in a short time are replaced faster than they are used
Answer:
exist in fixed amounts
Explanation:
The only attribute that describes nonrenewable resources is the existence in fixed amounts.
Nonrenewable resources are limited in amount and depleted at a much faster rate than they are naturally replaced. Even when they are to be replaced, it cannot be done within a short period.
An example is crude oil which exists as natural deposits deep in the ground. The world's crude oil deposit is limited and cannot be replaced at a rate they are being used by man if at all it can be replaced.
An attribute of nonrenewable resources' is they exist in fixed amount. The correct option is A.
What are non-renewable resources?
Non-renewable resources are those resources which are produced in millions of years, and are limited. Once these resources extincted, it will take millions of years again to produce these resources.
Thus, the correct option is A, exist in fixed amount.
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6. The nuclear reaction where Si-30 becomes P-30 is
a. Fission
b. Fusion
c. Alpha decay
d. Beta decay
e. Gamma decay
Answer:c
Explanation:
Give an example of number 14 in real life?
Answer:
im 14 years old.
Explanation:
Which one of these has kinetic energy?
A. book on the table
B. rock on top of a hill
C. a stationary car
D. A moving train
Answer:
The moving train
Explanation:
Kinetic energy is energy being used right now. So, the only object using energy right now is the moving train
Good luck on the rest of the test!
Convert 12.0 g of FeO into moles.
1 mole
71.85 moles
5.99 moles
O.17 moles
Answer:
71.85 moles
5.99 moles
O.17 moles
Explanation:
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Answer:
4th option: 0.17 moles
Explanation:
The number of moles of a substance can be calculated using the following formula: Mole= Mass ÷Mr
The Mr of a compound is its molecular weight, which is the sum of the relative atomic masses of the atoms it is made up of.
Find the Mr using the periodic table:
Mr of FeO
= 55.8 +16
= 71.8
Calculate number of moles:
Amount of FeO
= 12 ÷71.8
= 0.17 moles (2 d.p.)
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which process are the products of the reaction glucose and oxygen?
A.
Photosynthesis
B.
Aerobic cellular respiration
C.
Lactic acid fermentation
D.
Alcoholic fermentation
Answer:
b
Explanation:
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suggest why you cannot compare the reactivity of sodium and potassium using displacement reactions in solution
Answer:
Sodium has an atomic number of 11 while potassium has an atomic number of 19
• Despite smaller atomic number, sodium is denser than potassium
• Potassium reacts much more violently with water
• While excess of sodium is harmful for us, low levels of potassium have also been found to be associated with certain disorders of lungs and heart.
Explanation:
found this on the internet
Identify the molecule containing the least oxygen atoms. A) 12.044 × 10^23 molecules of CO2. B) 12 g of O3. C) 0.1 mol of V2O5. D)10 mL of H2O.
Answer:
C. 0.1 mol of V₂O₅
Explanation:
Number of moles of oxygen atoms present in each molecule is derived as follows:
A. Number of molecules of CO₂ in 12.044 * 10²³ molecules of CO₂ = 12.044 * 10²³/6.022 * 10²³ = 2 moles of CO₂ molecules
Each molecule of CO₂ contains 2 atoms of oxygen. Therefore, number of moles of oxygen atom present in 2 molecules of CO₂ = 2 * 2 moles of oxygen atoms = 4 moles of oxygen atoms.
B. Number of moles of O₃ molecules in 12g of O₃ = mass of O₃/molar mass of O₃
molar mass of O₃ = 48 g/mol
Number of moles of O₃ molecules = 12/48 = 0.25 moles of O₃
There are 3 atoms of oxygen in a molecule of O₃, therefore number of moles of oxygen atoms present in 12 g of O₃ = 3 * 0.25 = 0.75 moles of oxygen atoms
C. There are 5 oxygen atoms in a molecule of V₂O₅
0.1 mol of V₂O₅ contains 0.1 * 5 moles of oxygen atoms = 0.5 moles of oxygen atoms.
D. mass of 10 mL of H₂O = 10 g since the density of H₂O = 1 g/mL
molar mass of H₂O = 18.0 g/mol
Number of moles of H₂O in 10 g of H₂O = 10/18 = 0.56 moles
There are 1 atom of oxygen in a molecule of H₂O, therefore, number of moles of oxygen present in 10 g of H₂O = 0.56 * 1 = 0.56 moles of oxygen atoms
Therefore, 0.1 mole of V₂O₅ contains the least number of oxygen atoms.
what will you suggest to a person who is suffering from the problem of acidity after overeating?
Answer:
If someone is suffering from the problem of acidity after overeating Baking soda solution would be suggested as a remedy as it is basic in nature, it neutralises excess acid in the stomach.
please help on question 7 and 8
Answer:
7. 5km/h
8. 10km/h
I just need to add characters so i can post
ASAP (2 questions & are iv the pic ) will get BRAINIEST
Answer:
Hey again!
Q1: 4 N
Q2: 24 N
6. The proper combination of temperature, water, and oxygen
Answer:
electrolytic reaction; oxygen and hydrogen combine to form water, producing electrical energy and releasing heat.
Explanation:
Help will give brainliest!!
Give oxidation and reduction half-reactions to the equation provided
Half reaction :
Oxidation
Cu ⇒ Cu²⁺ + 2e⁻
Reduction
2Ag⁺+ 2e⁻ ⇒2Ag
Further explanationGiven
Reaction
Cu+2AgNO₃⇒Cu(NO₃)₂+2Ag
Required
Oxidation and reduction half-reactions
Solution
Oxidation is an increase in oxidation number, while reduction is a decrease in oxidation number.
OxidationCu ⇒ Cu²⁺ + 2e⁻
0 to +2
Reduction2Ag⁺+ 2e⁻ ⇒2Ag
+1 to 0
Write a chemical formula for this molecule.
Answer:
CO2
Explanation:
we can see one carbon atom and 2 oxygens meaning this is Carbon dioxide or CO2
A gate made of painted iron is beginning to rest in areas where the paint has worn away why is the formation of rust considered a chemical change?
Answer:
because it is two substances reacting together to create a new substance
Explanation:
when iron rusts, iron molecules react with the oxygen molecules creating iron oxide aka rust.
What is the molarity of a sodium carbonate solution containing 32.52 g Na2CO3 dissolved in enough water to make 822 ml of solution?
NEED ASAP PLEASE!!
The molarity of a Sodium carbonate solution : 0.373 M
Further explanationGiven
32.52 g Na₂CO₃
822 ml of solution = 0.822 L
Required
The molarity
Solution
Molarity shows the number of moles of solute in every 1 liter of solution.
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
mol of solute = mol of Na₂CO₃ :
= mass : MW Na₂CO₃
= 32.52 g : 106 g/mol
= 0.307
Molarity :
= n : V
= 0.307 mol : 0.822 L
= 0.373 M
This type of erosion picks up materials and transports them in the air, often causing the abrasion of surfaces.
Answer: Sediment Transport by Wind
Explanation: Like flowing water, wind picks up and transports particles. Wind carries particles of different sizes in the same ways that water carries them (Figure below). Tiny particles, such as clay and silt, move by suspension. They hang in the air, sometimes for days.
Why do molecules with lone pairs of
electrons have different molecular
geometry's compared to those with the
same number of electron domains.
Answer:
Because according to VSEPR theory lone pair occupies more space than bond pair.
Explanation:
Lone pair of electrons repels from bonded pair of electrons than that between bond pair of electrons itself. Hence, molecules attain a geometry in which the repulsive force is minimum.
What is lone pair of electrons ?The lone pair of electrons are pair of electrons which are not involved in bonding in any occasion but can be donated through coordinate bonds in some compounds.
Oxygen, nitrogen etc. contains lone pair of electrons. According to VSEPR theory, the lone pair -lone pair repulsion > lone pair -bond pair > bond pair-bond pair repulsion.
Therefore, these electron pairs are aligned around the central atom in such a way that the repulsive force between the electron clouds are minimized.
For example, if consider hybridization of water molecule, it must acquire a tetrahedral shape, but the lone pairs will align axial and will assume a bent shape.
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Which one of the following substances is an element?
Answer: Fe
Explanation: Fe (Iron) is the only element since it involves only 1 atom. The other options are compounds, since there are more than 2 atoms bonded together.
The force that pulls falling objects toward Earth is called?
the force that pulls falling objects is gravity.
What is solubility a measure of?
A. The amount of solute that will dissolve
B. The type of solute that will dissolve
C. The rate at which the solute will dissolve
D. The energy needed for the solute to dissolve
Answer:A
Explanation:
I just took the test
Complete and balance the equations for the following double displacement reactions:
Answer:
A. AgNO₃ + NaCl —> AgCl + NaNO₃
B. Mg(NO₃)₂ + 2KOH —> 2KNO₃ + Mg(OH)₂
C. 3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + 3LiNO₃
Explanation:
The equation given in the question above can be balanced as follow.
A. AgNO₃ + NaCl —> AgCl + NaNO₃
The above equation is already balanced.
B. Mg(NO₃)₂ + KOH —> KNO₃ + Mg(OH)₂
There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before KOH as shown below:
Mg(NO₃)₂ + 2KOH —> KNO₃ + Mg(OH)₂
There are 2 atoms of K on the left side and 1 atom on the right side. It can be balance by writing 2 before KNO₃ as shown below:
Mg(NO₃)₂ + 2KOH —> 2KNO₃ + Mg(OH)₂
Thus, the equation is balanced.
C. LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + LiNO₃
There are 3 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 3 before LiOH as shown below:
3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + LiNO₃
There are 3 atoms of Li on the left side and 1 atom on the right side. It can be balance by writing 3 before LiNO₃ as shown below:
3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + 3LiNO₃
Thus, the equation is balanced.
Balance the chemical equation. Based on the equation, how many grams of chlorine are produced when the sodium chloride decomposes and produces 19.5 grams of sodium? Use the periodic table to get the weights of the elements.
Drag the labels to the correct locations to complete the analysis. Each label can be used more than once.
]
Answer:
Answer is in the photo
Explanation:
Have a nice day and if the photo isn’t visible let me know! :)
The balance chemical equation is as,
[tex]2NaCl[/tex] → [tex]2Na + Cl_{2}[/tex]
The 30.1 grams of chlorine are produced when the sodium chloride decomposes and produces 19.5 grams of sodium.
Calculation,
22.99 g of sodium present in 1 mole of sodium atom.
In 19.5 g of sodium = 19.5 g× 1 mole / 22.99 g = 0.85 mole
The mole ratio = 2:1
It means 2 mole of sodium produce along with 1 mole of chlorine when sodium chloride decomposed.
So, number of mole of chlorine when 0.84 mole of sodium produce = 0.85 mole×1 mole/ 2 mole = 0.424 mole
number of mole of chlorine = given mass/molar mass of [tex]Cl_{2}[/tex] = 0.424
Given mass of [tex]Cl_{2}[/tex] = molar mass of [tex]Cl_{2}[/tex]× number of moles of [tex]Cl_{2}[/tex] = 70.9×0.424 = 30.1 gram
What is balanced chemical equation?The symbolic representation in which number of atoms in reactant side is equal to number of atoms in product side.
learn about balance chemical equation,
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2. The vertical columns in the periodic
table are called
O families
O periods
O rows
Answer:
2. Periods
Explanation:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. ... Elements in the periodic table are organized according to their properties.
1. How many atoms are in 3.5 moles of nickel?
The number is 6.022 x 10^23 atoms/mol.
is inorganic fertilizer and chemical fertilizer same?
Fertilizers supplement the soil with macronutrients needed in large amounts: nitrogen, phosphorous and potassium. ... Inorganic fertilizer, also referred to as synthetic fertilizer, is manufactured artificially and contains minerals or synthetic chemicals. so no
Explanation:
1. Calculate the percent composition for each element in CH 206 Glucose.
%C = 40
%H = 6.67
%O = 53.33
Further explanationGiven
Glucose C₆H₁₂O₆
Required
The percent composition
Solution
MW Gulucose = 180 g/mol
Ar C = 12 g/mol
Ar H = 1 g/mol
Ar O = 16 g/mol
%C = 6.12/180 x 100% = 40%
%H = 12.1/180 x 100% = 6.67%
%O = 6.16/180 x 100% = 53.33%
