Question 3 (1 point)
What are the best units for a scientist to measure the distance between cities?
A. miles
B.inches
C.meters
D.kilometers
Answer: A and D
Explanation: Miles and Kilometers are the best units when measuring distances between cities, this is because both units will in most cases give a reasonable representation of the distance being measured by giving an output which isn't too large or extremely small. Feets and inches are usually adopted when measuring length of objects which in most cases are small and average only a few meters. Meters are also used for measuring short and medium distances. However, representing distances between two cities in terms of inches or feets will usually give extremely large values. Hence, the need for a fairly larger unit in miles or kilometers.
If 6.02*10^23 molecules of ammonia react with 12.04*10^23 molecules of hydrogen chloride, how many molecules are in the reaction vessel when the reaction is complete
Answer:
18.06 × 10²³ molecules
Explanation:
Add the two amounts of molecules together.
6.02 × 10²³ + 12.04 × 10²³ = 18.06 × 10²³
You will have 18.06 × 10²³ molecules in the vessel when the reaction is complete. This is because of the Law of Conservation of Mass. Mass is neither created nor destroyed in chemical reactions. You will have the exact number of molecules in the reaction vessel as you did in the beginning. The types of molecules may change, but the number will stay the same.
______is used in production of hard disk. 1 platinum 2 silver 3 gold
Answer:
platinum
Explanation:
the film on a hard drive platter contains platinum
Consider the electron configuration. A box holds an up and a down arrow. A box holds an up and a down arrow. A box holds an up and a down arrow.A box holds an up and a down arrow.A box holds an up and a down arrow. A box holds an up and a down arrow. A box holds an up and a down arrow.A box holds an up and a down arrow.A box holds an up arrow. 1s 2s 2p 3s 3p Which element has this electron configuration?
Answer:
The Argon ([tex]Ar[/tex]) has this electron configuration.
Explanation:
The question is wrong. The correct electron configuration is :
[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}[/tex]
The electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
The letters s,p,d and f are called the orbitals.
The numbers 1,2,3,4,5,6 and 7 are called the levels.
The maximum numbers of electrons that the s-orbital can hold is 2 electrons.
The maximum numbers of electrons that the p-orbital can hold is 6 electrons.
The maximum numbers of electrons that the d-orbital can hold is 10 electrons.
The maximum numbers of electrons that the f-orbital can hold is 14 electrons.
The order in which the orbitals are filled is :
1s-2s-2p-3s-3p-4s-3d-4p-5s-4d-5p-6s-4f-5d-6p-7s-5f-6d-7p-6f-7d-7f
To identify the electron configuration of an element we need to count and sum the exponents of its orbitals.
The electron configuration is :
[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}[/tex]
Has the following sum of exponents : [tex]2+2+6+2+6=18[/tex]
Therefore the total electrons of the element is 18 electrons.
The element that has 18 electrons is Argon ([tex]Ar[/tex])
Answer:
C) chlorine
Explanation:
edge 2023
What does control group mean
HELP give 5 examples of how greenhouse gases effect's our earth ANd wHo wAnNa be FrIeNds.
Answer:
- sunlight heats the earth's surface
- climate change by trapping heat in the ozone layer
- increased wild fires
- food shortages due to higher temperatures
- they contribute to respitory disease due to smog and air pollution
(lol i'll be your friend)
gold is heavier than aluminium if we put a 100 gram biscuit of gold in water taken in a measuring cylinder or we put a 100 gram aluminium bar in the measuring cylinder will the rise in the level of the water be same or different in the two cases give reason
Answer:
The level of the water will be higher for 100g Al because occupy more space than gold.
Explanation:
To understand this problem, we must know Archimedes' principle:
"A body that is submerged in a fluid produce a bouyant force equal to the weight of the fluid that the body displaces". The volume of the body is equal to the volume displaced in the liquid.
Now, as gold is heavier than aluminium, 100g of Al have more volume than 100g of gold, than means:
The level of the water will be higher for 100g Al because occupy more space than gold.Which statement is not correct?
A: Energy is released when a liquid changes into a solid.
B: Particles move faster in the gaseous state than in the liquid state.
C: The carbon atoms in gaseous methane are further apart than those in solid diamond.
D: There is a large decrease in the volume of a solid metal when pressure is applied to it.
Answer:
D
Explanation:
If we put pressure on a solid or a liquid, there is essentially no change in volume.
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the incorrect statement is option D that is there is a large decrease in the volume of a solid metal when pressure is applied to it.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter. When we apply pressure on solid, then there is no change in volume of the solid matter.
Therefore, the incorrect statement is option D that is there is a large decrease in the volume of a solid metal when pressure is applied to it.
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What is the mass of a sample of iron that has had 300.0 j applied to it and heats up from 20.0 degrees Celsius to 40.0 degrees Celsius.. the specific heat of iron is 0.46j/gC
Answer:
The mass of a sample of iron that has had 300 J applied to it and heats up from 20 degrees Celsius to 40 degrees Celsius is 32.61 grams.
Explanation:
Calorimetry is the measurement and calculation of the measurement of heat changes exchanged by a body or a system produced in physical and chemical processes.
The sensible heat of a body is the amount of heat received or transferred by a body to produce a change in temperature but without a change in physical state.
The sensible heat in a constant pressure is calculated by:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c, and where ΔT is the temperature variation (ΔT=Tfinal - Tinitial)
In this case:
Q= 300 Jc= 0.46 [tex]\frac{J}{g*C}[/tex]m= ?Tfinal= 40 CTinitial= 20 CReplacing:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* (40 - 20) C
Solving:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* 20 C
[tex]m=\frac{300 J}{0.46 \frac{J}{g*C} * 20 C}[/tex]
m= 32.61 g
Compare the properties of iron and nickel.
I need 3 comparisons
Answer:
It is important to note that iron, cobalt, and nickel which appear in period 4, of the transition metals, next to each other, share very similar physical and chemical properties and are known collectively as the iron triad
The comparison of the properties of iron includes
Chemical properties
1) Atomic number; The atomic number of iron is 26 while the atomic number of nickel is 28
2) The oxidation states of iron are 2, 3, 6 while the oxidation state of nickel are 2,3
3) The ionization energies in kJ/mol are first 759, second 1561, and third 2957 for iron and first 737, second 1753, and third 3393 for nickel
Physical properties
1) The mass of iron is 55.85 with density = 7.87 g/cm³, the mass of nickel is 58.69 with density = 8.91 g/cm³
2) The melting point of iron is 1530°C, boiling point 2862°C and that of nickel are 1455°C and 2732°C
3) The electrical conductivity of iron is 16 and that of nickel is 23
Explanation:
A sample of marble has a volume of 6 cm3 and a density of 2.76 g/cm3. What is its mass?
Answer:
16.56g
Explanation:
6*2.76=16.56...
Answer:
16.56 grams
Explanation:
The density can be found using the following formula:
[tex]d=\frac{m}{v}[/tex]
If we rearrange the formula for m, the mass, we should multiply both sides by v.
[tex]d*v=\frac{m}{v} *v[/tex]
[tex]d*v=m[/tex]
The mass can be found by multiplying the density and the volume. The density is 2.76 grams per cubic centimeter. The volume is 6 cubic centimeters.
[tex]d= 2.76 g/c^3\\v=6 cm^3[/tex]
Substitute the values into the formula.
[tex]m= d*v[/tex]
[tex]m= 2.76 g/cm^3 * 6 cm^3[/tex]
Multiply. When you multiply the 2 "cm^3" will cancel each other out.
[tex]m= 2.76 g* 6[/tex]
[tex]m= 16.56 g[/tex]
The mass of the marble is 16.56 grams.
How much heat is absorbed by 20g granite boulder as energy from the sun causes its temperature to change from 10°C to 29°C? The specific heat capacity of granite is 0.79 J/gºC.
Given :
Mass of granite , m = 20 g .
Change in temperature , [tex]\Delta T=29-10=19^oC[/tex].
Specific heat capacity of granite , [tex]C=0.79\ J/g^oC[/tex] .
To Find :
The heat absorbed by granite .
Solution :
We know , heat absorb is given by :
[tex]\Delta H=mC\Delta T\\\\\Delta H=20\times 0.79 \times 19 \ J\\\\\Delta H=300.2\ J[/tex]
Therefore , heat absorb is 300.2 J .
Hence , this is the required solution .
Taking into account the definition of calorimetry, the heat absorbed is 300.2 J.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat exchanged by a body without affecting its molecular structure. If you don't change the molecular structure, you don't change the state of aggregation. Since the molecular structure does not change, a change in temperature is observed.
In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case:
Q= ? c= 0.79[tex]\frac{J}{gC}[/tex] m= 20 g ΔT= Tfinal - Tinitial= 29 C - 10 C= 19 CReplacing in the expression to calculate heat exchanges:
Q= 0.79[tex]\frac{J}{gC}[/tex]× 20 g× 19 C
Solving:
Q= 300.2 J
In summary, the heat absorbed is 300.2 J.
Learn more:
brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsSteve is performing a titration, where a base is at an unknown concentration. What should he choose as his indicator solution?Steve is performing a titration, where a base is at an unknown concentration. What should he choose as his indicator solution?
Answer:
D
Explanation:
Answer:
D) A chemical that's clear when basic and turns color when acidic is correct!
Explanation:
I got it right on a test!
Hope this Helps!! :))
The number of neutrons in an atom affects the atomic ________of the atom. A. Activity B. number C. size D. mass
Answer:
D. Mass
Explanation:
Answer:
D
Explanation:
The number of neutrons in an atom affects the atomic mass number or atomic weight.
You titrate 5.0 mL of HCl with 0.010 M NaOH. You find the end point of your titration occurs when 12.0 mL of NaOH has been added. What is the total volume of the solution at the end point of the titration
Answer:
The total volume of the solution at the end point of the titration is 17.0 mL
Explanation:
First we will write a balanced chemical equation for the reaction between HCl and NaOH.
HCl + NaOH → NaCl + H₂O
This means 1 mole of HCl will react with 1 mole of NaOH to give 1 mole of NaCl and 1 mole of H₂O
From the question,
Concentration of acid (HCl), [tex]C_{A}[/tex] = ??
Volume of acid (HCl), [tex]V_{A}[/tex] = 5.0 mL
Concentration pf base (NaOH), [tex]C_{B}[/tex] = 0.010 M
Volume of base (NaOH), [tex]V_{B}[/tex] = 12.0 mL
To determine the Concentration of acid, [tex]C_{A}[/tex]
From,
[tex]\frac{C_{A}V_{A} }{C_{B}V_{B} } = \frac{n_{A} }{n_{B} }[/tex]
Where [tex]n_{A}[/tex] is the mole ratio of acid
and [tex]n_{B}[/tex] is the mole ratio of base.
The concentration of the acid used can be determined from the above formula.
But, we are asked to find the total volume of the solution at the end point of the titration
The total volume of the solution will be the sum of the volume of HCl that reacted and volume of NaOH that reacted.
Hence, The total volume of the solution = [tex]V_{A} + V_{B}[/tex]
= 5.0 mL + 12.0 mL
= 17.0 mL
Hence, the total volume of the solution at the end point of the titration is 17.0 mL
is Weight Measurement a phenomenon?
Answer:
yes
Explanation:
it change everything
im pretty sure the awnser is yes
A biological community together with its physical habitat constitutes a(n) ____________ .
Answer:
Ecosystem
Explanation:
I got the answer from the Mcgrawhill textbooks.
Ella holds an ice cream cone in her hand. She soon notices that her hand begins to feel cold. Which claim explains what is different about the particles that make up her hand?
Answer:
what's different about the particles in her hand are that for one are a solid in contrast to the ice cream which is partially liquid.
12. What is the mass, if the density is 2 and the volume is 6? *
3
O 12
O 15
How many grams are in 0.02 moles of beryllium iodide, Bel2?
Answer:
5.26g
Explanation:
Please see attached picture for full solution.
When you walk up to any substance, you can categorize the substance as a solid, liquid, or gas. You could further categorize the substance as being a pure substance or a mixture, which you wouldn't know without more information. Assuming the substance is pure, what are 3 ways you could report the "amount" of substance in front of you
Answer and Explanation:
In Chemistry, the quantity or amount of a pure substance is given by:
mass (in grams)Volume (in millilitres or litres)Moles (mol)Inter-conversion of units is allowed based on defined units and constituent of the substance.
I believe this explanation would be helpful and easy to follow.
If a cubic container has a side length of 50.0cm ,what is the volume in the liter?
Answer:
0.05 Liter
Explanation:
Conversion factor: 1/1000
1) Liter = Cubic Centimeter / 1000
2) Liter = 50 / 1000
3) Liter = 0.05
The carbon _____________________combines chemically with oxygen and hydrogen to form a _________________________known as sugar. When making syrup, the sugar is dissolved in water to make a_________________________ . Before the sugar and water are mixed, the _______________________________mixture is not the same sweetness throughout. After mixing, the solution____________________________ is because when sugar is evenly disbursed throughout the water. Finally, the water is slowly boiled off and the solution slowly becomes sticky and gooey because the______________________ has increased and the solution now resists flowing.
Compound, Element ,Heterogeneous ,Homogeneous, Mixture ,Viscosity
The carbon element combines chemically with oxygen and hydrogen to form a compound known as sugar. When making syrup, the sugar is dissolved in water to make a mixture . Before the sugar and water are mixed, the heterogenous mixture is not the same sweetness throughout. After mixing, the solution homogenous is because when sugar is evenly disbursed throughout the water. Finally, the water is slowly boiled off and the solution slowly becomes sticky and gooey because the viscosity has increased and the solution now resists flowing.
What do you mean the solution ?A solution is a homogeneous mixture of two or more substances. A solution may exist in any phase. A solution consists of a solute and a solvent.
For the solutions, with components in the same phase, the substances present in lower concentration are solutes, while the substance present in higher concentration is the solvent.
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Organisms can be grouped according to how similar they are to one
another.Which list correctly shows the categories for sorting organisms
from the largest group to the smallest group? *
Answer:
Kingdom, phylum, class, order, family, genus, and species
Explanation:
Kingdom, phylum, class, order, family, genus, and species are the list used to classify organisms on the basis of similarities and differences. The largest group of classification is kingdom while the smallest group is the species. In each category, the organisms which are present are similar to each other while different from one another in some characteristics.
In an atom, what is the number of profons equal
to?
Answer:
The atomic number
when salt is dissolved in water the result is a
Answer:
Water molecules pull the sodium and chloride ions apart
Explanation:
NEED HELP with 7. 8. 9. 10. 11. 12. And 14 !!
Answer:
1. 0.00040 calories
2. 8.57 calories
3. 0.196 calories
4. 68 calories
5. 243 calories
6. 83680 joules
7. 1,054,368 joules
8. 2.45 calories
9. 556 (it says calories to calories so it wouldn't change)
10. 28367.52 joules
11. 59.6 calories
12. 449.6 joules
13. 0.00234 calories
14. 23292.328 joules
15. 22877693.6 joules
Hope this helps!
Explanation:
Can someone find the independent variable and the dependent variable ? :)))
Answer: Dependant variable = The distance it takes for each car to stop. Independent variable = Both cars go at 60 mph.
Explanation:
This is right because the dependant variable changes and the independent variable is the outcome of the dependant variable.
A centimeter and milimeter differ from each other by a factor of _____?
Answer:
10
Explanation:
a centimeter and a milimeter differ from each other by a factor of 10
Answer: 10
Explanation:
Why is it important to collect all data during experiments, rather than make inferences of what will happen?
Answer:
It is important to collect all data first, or else your guesses could purely be the opposite of the right answer. If you make inferences of what might happen, your guesses may be purely fictional, and totally off-topic. During experiments, this step is important.