Answer: b!
Explanation:
How are molecules built?
Bonding
Atomic Rays
Phase Changes
All of these
2. Explain Why would it be difficult to find the volume of a rock using
a ruler?
Answer:
Most of these rocks are not made up of common geometric shapes
Explanation:
Because most rocks are not made up of common geometric shapes, it would be difficult or impossible to find the volume of a rock using a ruler; there would be no easy way to measure the rock's volume using a ruler
Hope this helped!
Which of the following describes light? (SELECT ALL THAT APPLY.)
A. Light passes through all objects.
B. Light is reflected off the surface of mirrors.
C. Light travels in a straight line.
D. Light waves behave in predictable ways.
Answer:
The light reflects twice before it finally exits the system. Draw a normal at the point of incidence to the first mirror; measure the angle of incidence (45 degrees); then draw a reflected ray at 45 degrees from the normal. Repeat the process for the second mirror.
Explanation:
Hope that helps!
A solution is made by mixing 49.g of chloroform CHCl3 and 73.g of acetyl bromide CH3COBr. Calculate the mole fraction of chloroform in this solution. Round your answer to 2 significant digits.
Answer: The mole fraction of chloroform in this solution is 0.41
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
a) moles of [tex]CHCl_3[/tex]
[tex]\text{Number of moles}=\frac{49g}{119g/mol}=0.41moles[/tex]
b) moles of [tex]CH_3COBr[/tex]
[tex]\text{Number of moles}=\frac{73g}{123g/mol}=0.59moles[/tex]
To calculate the mole fraction, we use the formula:
[tex]\text{Mole fraction of a component}=\frac{\text{Moles of the component}}{\text{total moles}}[/tex]
[tex]\text{Mole fraction of chloroform}=\frac{\text{Moles of chloroform}}{\text{total moles}}=\frac{0.41}{0.41+0.59}=0.41[/tex]
The mole fraction of chloroform in this solution is 0.41
Which of the following is NOT a heterogenous mixture:
Salad
Beef Stew
Cereal in milk
Vinegar
Answer:Vinegar
Explanation:
Enzymes are catalysts in reactions. What statements describe functions of enzymes?
a. Enzymes are specific in their actions.
b. Once an enzyme binds to a substrate, it cannot be used again.
c. Enzymes lower the energy of activation needed for a reaction
d. Enzymes change the amount of free energy produced
e. Enzyme activity can be affected by temperature.
Answer:
a. Enzymes are specific in their actions.
c. Enzymes lower the energy of activation needed for a reaction
e. Enzyme activity can be affected by temperature.
Explanation:
Enzymes are proteinous structures that acts as biological catalysts in chemical reactions that occur within a system. Like every other catalyst, which speedens the rate of chemical reactions, enzymes possess certain characteristics that makes them have the catalytic nature. They include:
- Enzymes are specific in their actions: Enzymes are substrate-specific, meaning that an enzyme can only act on a substrate it recognizes and binds to.
- Enzymes lower the energy of activation needed for a reaction: Enzymes like other catalyst speed up the rate at which a reaction occurs by lowering the activation energy needed for the reaction to take place.
- Enzyme activity can be affected by temperature: Since enzymes are proteinous i.e made of proteins, they can be easily denatured by temperature. Hence, when exposed to high temperature, enzymes can lose its shape and ultimately its function.
a. Enzymes are specific in their actions.
c. Enzymes lower the energy of activation needed for a reaction
e. Enzyme activity can be affected by temperature.
What are Enzymes?
Enzymes are structures that acts as biological catalysts in chemical reactions that occur within a system. Like every other catalyst, which increases the rate of chemical reactions, enzymes possess certain characteristics that makes them have the catalytic nature. They include:- Enzymes are specific in their actions: Enzymes are substrate-specific, meaning that an enzyme can only act on a substrate it recognizes and binds to.
- Enzymes lower the energy of activation needed for a reaction: Enzymes like other catalyst speed up the rate at which a reaction occurs by lowering the activation energy needed for the reaction to take place.
- Enzyme activity can be affected by temperature: As enzymes are proteinous i.e. made of proteins, they can be easily denatured by temperature. Hence, when exposed to high temperature, enzymes can lose its shape and ultimately its function.
Therefore, option a, c and e are correct.
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HC2H3O2 chemical compound?
Answer:
Ethanoic or acetic acid.
Explanation:
Hello!
In this case, since the chemical formula of the compound excludes the hydrogen from the CHO form, we can infer it is a leaving group, which is likely to be bonded with an oxygen due to the high polarity of the O-H bond. In such a way, the most feasible condensed structure is:
[tex]CH_3-COOH[/tex]
Whereas the COOH stands for the carboxyl group; therefore the compound is ethanoic acid or acetic acid.
Regards!
12. Which of these is a solution? *
Gold
Salt
Water
Carbonated Water
All of the above.
Answer:
carbonated water
remaining are single element
Which equation could be used to solve for the average speed of a car that travels 90m in 20 seconds?
Answer:
Vav=d/t
Explanation:
Because the question already gave d=90m and t=20s. Because the car is the thing that can not travel the same distances at the same times.So the equation is V[tex]\\_{av}[/tex]=[tex]\frac{d}{t} \\[/tex]
The volume of 2.050 M copper(II) nitrate that must be diluted with water to prepare 750.0 mL of a 0.8543 M solution is equal to mL. Report your answer to 4 significant figures in decimal notation (not scientific or exponential notation).
Answer:
312.5
Explanation:
The volume of 2.050 M copper(II) nitrate that must be diluted with water to prepare 750.0 mL of a 0.8543 M solution is equal to 312.5 ml.
What is volume?Volume is defined as a three dimensional quantity that is used to measure the capacity of a solid shape.
It is also defined as the measure of the capacity that an object holds.
M1V1 = M2V2
Here M1 = 2.050 M
M2 = 0.8543 M
V2 = 750 ml
So, V1 = M2V2 / V1
= 0.8546 M x 750 ml / 2.050
= 312.5 ml
Thus, the volume of 2.050 M copper(II) nitrate that must be diluted with water to prepare 750.0 mL of a 0.8543 M solution is equal to 312.5 ml.
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A certain ore is 37.3 % nickel by mass. How many kilograms of this ore would you need to dig up to have 65.0 g of nickel
Answer:
0.174kg of Ore are required
Explanation:
The ore of 37.3% in nickel by mass means that in 100g of ore there are 37.3g of nickel. As we need to obtain 65g of nickel we can convert this mass to mass of ore using the conversion factor (100g Ore / 37.3g Nickel) as follows:
65g of nickel * (100g Ore / 37.3g Nickel) = 174g of Ore are needed to have 65.0g of nickel. In kilograms:
174g Ore * (1kg / 1000g) =
0.174kg of Ore are required
How do you know whether or not a chemical
reaction equation follows the law of
conservation of mass?
Answer:
- Because it has or not the same number of atoms at each side.
- Because the mass of reactants and product is or not the same after the reaction.
Explanation:
Hello!
In this case, since the law of conservation of mass states that matter cannot be created nor destroyed; when we see a chemical reaction, we need to make sure that the amount of atoms is the same at both reactants and products; for instance the formation of water requires four hydrogen atoms and two oxygen atoms at both reactants and products sides as shown below:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Another way is by proving that the total mass of products equals the total mass of reactants once the reaction has gone to completion.
Best regards!
Number of atoms in 4.5 moles of Au?
An animal is an example of a/an-
A: tissue
B:cell type
C:organ
D:organism
Answer:
D
Explanation:
organism
Answer:
The answer should be organism
And electro chemical cell has the following standard cell notation:
Mg(s) | Mg2+ (aq) || Ag+(aq)| Ag(s)
Write a balanced redox reaction for the cells using the oxidation and reduction half reactions. (be sure to equalize charge by multiplying the correct number before adding and simplifying)
2Ag⁺(aq) + Mg(s)→ 2Ag(s) + Mg²⁺ (aq)
Further explanationGiven
Standard cell notation:
Mg(s) | Mg2+ (aq) || Ag+(aq)| Ag(s)
Required
a balanced redox reaction
Solution
At the cathode the reduction reaction occurs, the anode oxidation reaction occurs
In reaction:
Ag⁺ + Mg → Ag + Mg²⁺
half-reactions
at the cathode (reduction reaction)Ag⁺ (aq) + e⁻ ---> Ag (s) x2
2Ag⁺ (aq) + 2e⁻ ---> 2Ag (s)
at the anode (oxidation reaction)Mg (s) → Mg²⁺ (aq) + 2e−
a balanced cell reaction
2Ag⁺(aq) + Mg(s)→ 2Ag(s) + Mg²⁺ (aq)
Answer:2Ag⁺(aq) + Mg(s)→ 2Ag(s) + Mg²⁺ (aq)
Explanation:
just took test
what is the empirical formula of A compound is found to contain 39.12 % carbon, 8.772 % hydrogen, and 52.11 % oxygen by mass.
Answer:
C₃H₈O₃
Explanation:
Let's assume we have 100 g of said compound. Then we would have:
39.12 g of C8.772 g of H52.11 g of ONow we convert those masses into moles, using their respective atomic weights:
C ⇒ 39.12 g ÷ 12 g/mol = 3.26 mol CH ⇒ 8.722 g ÷ 1 g/mol = 8.722 mol HO ⇒ 52.11 g ÷ 16 g/mol = 3.26 mol OThen we divide those moles by the smallest number among them:
C ⇒ 3.26 mol C / 3.26 = 1H ⇒ 8.722 mol H / 3.26 = 2.68O ⇒ 3.26 mol O / 3.26 = 1Finally we multiply those numbers by 3, so as to convert the 2.68 of H into an integer:
C ⇒ 1 * 3 = 3H ⇒ 2.68 * 3 = 8O ⇒ 1 * 3 = 3Thus the empirical formula is C₃H₈O₃
11. Everybody loves Mr Brown
Answer:
NO I DON'T ✌✌✌✌✌✌✌✌✌
please help..............
rgrgtff
ghhbbbhhghghgghgggferer
Which one please help!!
AgCl⇒ the precipitate
Further explanationGiven
Reaction
2AgNO₃+CaCl₂⇒2AgCl+Ca(NO₃)₂
Required
The precipitate
Solution
Solubility rules :
soluble compound :
All compounds of NO₃⁻ and C₂H₃O₂⁻
Compounds of Cl−, Br−, I− except Ag⁺, Hg₂²⁺, Pb²⁺
So AgCl⇒ the precipitate
Ca(NO₃)₂⇒aqueous
HELP me plzzzzzzzzzzzzzzzzz
Answer:
Explanation:
bblblblbllbllbllb1234w
How do we use positive and negative signs to communicate the direction of a vector
Answer:
Two vectors are equal if they have the same magnitude and the same direction. Just like scalars which can have positive or negative values, vectors can also be positive or negative. A negative vector is a vector which points in the direction opposite to the reference positive direction.
Suppose you wanted to dissolve 40.0 g NaOH in enough H2O to make 6.00 dm3 of solution
Molarity of solution = 1.6 M
Further explanationGiven
40 g NaOH
6 L solution
Required
Steps to solve the problem of molarity
Solution
No additional information about the question.
If you want to make the solution above, then we just need to put the existing NaOH (40 g) into 6 L of water, then do the stirring (in a warm temperature above the hot plate will speed up the NaOH dissolving process)
But if you want to know the molarity of a solution, then
1. we calculate the moles of NaOH[tex]\tt mol=\dfrac{mass}{MW}[/tex]
MW(molecular weight) of NaOH=
Ar Na+ Ar O + Ar H
23 + 16 + 1 = 40 g/mol
so mol NaOH :
[tex]\tt mol=\dfrac{40~g}{40~g/mol}=1~mol[/tex]
2. Molarity(M)[tex]\tt M=\dfrac{n}{V}\\\\M=\dfrac{1}{6}\\\\M=0.16[/tex]
Kichi made a table to identify where she might find acids and bases in her house based on their common uses. Substance ammonium hydroxide sulfuric acid citric acid potassium hydroxide Location cleaning cabinet cosmetics bag refrigerator flashlight What error did Kichi make?
Ammonium hydroxide would be found in the pantry because it is found in vinegar.
Sulfuric acid would be found in the garage because it is used in car batteries,
Citric acid would be found in the garage because it is used to clean rust from metal.
Potassium hydroxide would be found in the kitchen cabinet because it is used in oven cleaner.
Answer:
Kichi made the an error in the 2nd row which is Sulfuric acid.
Sulfuric acid would be found in the garage because it is used in car batteries
Explanation:
Ammonium hydroxide (NH4OH) is used in household cleaners.
Sulfuric acid (H2SO4) is used in industrial chemicals and car batteries.
Citric acid (H3C6H5O7) is in lemons, limes, and oranges.
Potassium hydroxide is used in batteries.
Kichi made a mistake while locating sulfuric acid which is an acid and is used car batteries ,hence it should be found in garage rather than in cosmetics bag.
What is an acid?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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Given the conditional statement ~p → q, which statement is logically equivalent?
A. p → ~q
B. ~p → ~q
C. ~q → ~p
D. ~q → p
Answer:
A. p → ~q
Explanation:
I am double checking.
Ti(SO4)2 chemical compound?
Answer:
Titanium(IV) Sulfide
Explanation:
2
What is the difference between weight and mass?
A Weight depends on density and mass depends on gravity.
B Weight depends on gravity and mass depends on volume.
C
Mass depends on gravity and weight is constant.
D Welght depends on gravity and mass is constant.
Answer:
Weight is the measure of the force of gravity on an object. The mass of an object will never change, but the weight of an item can change based on its location. For example, you may weigh 100 pounds on Earth, but in outer space you would be weightless.
Explanation:
I can't see the options but I hope this helps!
Answer:
the answer is B.
I hope this helps!
Explanation:
Identify the ionic compound that can form between potassium as the metal and nitrogen as the nonmetal.
help!!
Answer:
[tex]6K _{(s)} + N _{2(g)} = = > \:2K _{3} N _{(s)} [/tex]
Potassium nitride
Which group in the periodic table contains the three elements with the highest electrical conductivities?
A. Group 8
B. Group 12
C. Group 11
D. Group 7
Answer:
C Group 11
Explanation:
Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).
These elements show highest electrical conductivity.
Answer:
C Group 11
Explanation:
Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).
These elements show highest electrical conductivity.
Explanation:
What is the value of 4a? when a= 3?
Answer:
12
Explanation:
4x3 is 12
Answer:
To solve this simple expression you must substitute [tex]a[/tex] for the number you are given, so, 3.
4[tex]a[/tex] -> 4 3
Now, when numbers are next to each other like this, they are always multiplied. So, the find the answer you would multiply 4 times 3...
4 x 3 = 12
So, you answer will be 12!
Atoms are stationary and don't move when in solid form.
False
True
Answer:
True? The don't stay exactly still i dont think, but i'd say true.
Explanation:
Answer:
TRUE
Explanation:
In a solid, atoms are packed tightly together and move very slowly. In fact, they do not flow at all: they simply vibrate back and forth.
Key words vibrate, not movement.
Correct me if I'm wrong of course
