Answer:
Sam's average speed = 2.22 m/s
Explanation:
The average speed refers to the speed with which a distance is covered within a particular time duration. The average speed of a moving object can be obtained by summing up all the varying speeds as the object moves from one point to another, within a particular time frame.
Sams average speed can be calculated using this formula:
Average speed = distance / time
Distance covered = 2000 meters
Time taken to cover the distance = 9:15 am - 9:00 am = 15 minutes = 15 X 60 seconds = 900 seconds
Sam's average speed = 2000meters / 900 secs = 2.22 m/second
Answer: tell me
Explanation:
i do not no
Balance this equation (step by step please)
Answer:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> 2 KNO_{3} + PbCrO_{4}[/tex]
Reactions:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> KNO_{3} + PbCrO_{4}[/tex]
Explanation:
In the reaction, the CrO4(Chromate) is a compound NO3(Nitrate) is a compound as well.
Ignore the number in front of the reaction first, calculate how many K, Cr, O, Pb and N in the equation for both left and right side.
Left side: K=2, Cr=1, Pb=1, N=2, O=10
Right side: K=1, Cr=1, Pb=1, N=1, O=7
So we need 3 more oxygen, 1 more nitrogen and 1 more potassium on the right.
If we add a 2 in front of KNO3, there will be 2 potassium, 2 Nitrogen and 6 oxygen, which the reaction complete.
Conclusion:
[tex]K_{2}CrO_{4} + Pb(NO_{3})_{2} >> 2 KNO_{3} + PbCrO_{4}[/tex]
- What is the concentration of hydrogen ions if the pH is 12?
Answer:
1 x 10^-12 mol dm^-3
Explanation:
[H+] = 10 ^ -pH
Therefore, pH 12 = 1 x 10^-12 hydrogen ion concentration
What is the mass in grams of 5.67 x 1021 molecules of carbon dioxide?
Answer:
5789.07
Explanation:
Which statement describes a reaction at 298 K if AH = 31 kJ/mol, AS = 0.093
kJ/(mol-K)?
O A. Gibbs free energy is negative.
B. It is at equilibrium.
C. It is exothermic.
D. It is not spontaneous.
Answer: (D) it is not spontaneous.
how many protons does gold have
Answer:
gold has 79 protons
Explanation:
i looked it up lol
(science)
hurry help!!
All commonly abused drugs are illegal.
true or false
Answer:
False
Explanation:
Many abused drugs are prescription drugs.
Which of the following pairs of elements is most likely to form an ionic bond?
A.
nitrogen and oxygen
B.
lithium and chlorine
C.
phosphorus and chlorine
D.
selenium and bromine
Answer:
B.
lithium and chlorine
Explanation:
Ionic bonds are typically formed between a metal and nonmetal. Lithium is an alkali metal in group one and chlorine is a halogen from group seven. They will bond to form the salt, lithium chloride.
Which of these can be used as an inert electrode?
copper
platinum
silver
zinc
Answer:
I believe it is platinum
Explanation:
I think it is, haha
Answer:
zinc
Explanation:
kwkejnrkewnrkwe
What is a unwanted change in the environment caused by substances or from of energy??
Answer:
pollution I think
Explanation:
How many moles of H2O(I) are formed from 3.85 mol of propane?
Answer:
15.4 moles
Explanation:
15.4 moles
PLS HELPPPP ME!!!!
What term do we use when the moon's light is going away and the moon seems
to be "shrinking" each day? Hint: Karate Kid: "Wax on wane off.”
HELPP PLSSSSS
PLS HELP DUE IN ONE HOUR The atomic size of atoms increases as you move from top to bottom within a group of
the periodic table. Please explain why the size increases. Limit your response to one
sentence. Use your own words to answer.
Answer:
Within a group trend
Explanation:
The atomic radius of atoms generally increases from top to bottom within a group trend. As the atomic number increases down a group, there is again an increase in the positive nuclear charge. As the atomic number increases within a period, the atomic radius decreases.
Vectors are arrows that tell us two things about force...WEIGHT and DIRECTION
True
False
Need help will mark brainliest!!
huryyyyyy plsssssssssssssssssss
Answer:
B.
Explanation:
bc it goes from having the potential to move to moving sorry if im wrong tho
(URGENT) will mark brainliest if you help me answer this
Question 1 options:
OH-
H+
Question 2 options:
OH-
H+
Question 3 options:
soap
bleach
apple juice
ammonia
Question 4 options:
lemon juice
bleach
milk
stomach acid
Question 5 options:
0-3
8-10
0-6
8-14
Question 6 options:
0-3
8-10
0-6
8-14
Question 7 options:
sour
bitter
sweet
salty
Question 8 options:
slippery
brittle
malleable
corrosive
Question 9 options:
slippery
brittle
malleable
corrosive
Question 10 options:
sour
bitter
sweet
salty
Answer:
For Q1: H+
For Q2: OH-
for Q3: Apple juice
For Q4: bleach
For Q5: 0-6
For Q6: 8-14
For Q7: Sour
For Q8: Corrosive
For Q9: Slippery
for Q10: Bitter
Explanation:
True or False vacuoles direct cell activities by sending instructions to different parts of an animal cell
Answer:
False
Explanation:
The nucleus controls the cells activities
when and if element 119 is discovered predict where it would be placed on the modern periodic table
Answer:yes
Explanation:
Because modern periodic table is designed in such a way that it can accomodate any new elemet which may be discovered in future
We have that for the Question "when and if element 119 is discovered predict where it would be placed on the modern periodic table" it can be said that With the existing information the element 119 will most likely be i the 8th period and the first group of the periodic table
8th period and the first group of the periodic tableFrom the question we are told
when and if element 119 is discovered predict where it would be placed on the modern periodic table
Generally
The Periodic table is naturally designed to accommodate new elements based on there properties
Therefore
With the existing information the element 119 will most likely be i the 8th period and the first group of the periodic table
For more information on this visit
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The correct coefficients needed to balance the following reaction are:
___ PbI2 + ___ ZnS → ___ PbS + ___ZnI2
a) 1, 2, 2, 1
b) 1, 1, 1, 1
c) 1, 1, 2, 2
d) 2, 1, 1, 2
how many grams of NaBr are in 20.5 L at STP
Answer:
94.15
Explanation:
Dylan puts two magnetic toy trains very close to each other on a track. What will happen next, and why?
Can you please help me !!
Answer:
Explanation:
A) O2 (non polar covalent)
B) HF (polar covalent)
C) NaCl (because its ionic)
im not 100% sure hope it helps
As Earth orbits the Sun, the seasons slowly change from one to the other. 5 points
Which of the following statements explains the occurrence of summer in
the Northern Hemisphere?
Earth is closest to the Sun in summer.
The Northern Hemisphere is tilted toward the Sun in summer.
The Northern Hemisphere is tilted away from the Sun in summer.
All parts of Earth receive more sunlight in summer.
Answer:
The Northern Hemisphere is tilted toward the Sun in summer is the correct answer.I hope this helps
Explanation:
Day turns into darkness as the Earth spins, and summer turns into winter when the Earth completes its whole cycle. Therefore, the Northern Hemisphere is tilted toward the Sun in summer. The correct option is option B.
What is rotation?The circular motion of an item about its center is referred to as rotation. Things can spin in a variety of ways. When a round, three-dimensional object rotates around an imaginary line inside of its center, it is a relatively common type of rotation. This focal point is known as an axis.
The Earth's rotation and revolution effect wind patterns, temperature, ocean currents, and precipitation, which together determine our local weather and the planet's overall climate. the Northern Hemisphere is tilted toward the Sun in summer.
Therefore, the Northern Hemisphere is tilted toward the Sun in summer. The correct option is option B.
To know more about rotation, here:
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When a logger cuts down a
tree, what type of change is
happening to the tree?
A. Physical change
B. Chemical change
'C. Mixture change
Answer:
A
Explanation:
Answer:
A
Explanation:
The original chemical structure of the tree is not changing, therefore it is not a chemical change, and it is definetely not a mixture change, its a physical change.
Need help fast plzzz!!! Please help.
Answer:
1. 0.5333333m (Calculator Soup Work Calculator)
2.
9. 29.1666666667% efficient
10. 44.5% efficient
Explanation:
will do other answers later
What are the characteristics of the three states of matter?
Solid:
Liquid:
Gas:
Isotopes are atoms of the same element that have different O principal chemical properties, masses. O numbers of protons, O numbers of electrons.
Answer:
Different atomic mass, number of neutrons
Explanation:
Isotopes refer to atoms of the same element, with same atomic number, number of protons & electrons. However, they have different atomic mass, because of different number of neutrons.
What is a endothermic reaction
Answer:
Basically, it's heat transfer!
Good luck!Answer:
An endothermic process is any process with an increase in the enthalpy H of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system.
Explanation:
Which statement correctly compares the sun and planets? A. Planets have an atmosphere; the sun does not. B. Planets gives off energy; the sun does not. C. Planets orbit the sun; the sun is at the center of the solar system. D. Planets are all made of solid materials; the sun is made of gases.
Answer:
c
Explanation:
because the sun is at the center of the universe the planet orbit the sun its basically a simple answer so if you need more help im right here
The sun and the planets are part of the solar system. The sun is in the center of the system, and the planets revolve around it. Thus, option C is correct.
What is the solar system?A solar system is a part of the Milky Way galaxy that includes the planets, stars, sun, moon, asteroids, etc. The Sun is the star that is fixed at the center of the system.
The planets are not fixed and revolve in orbit around the sun and rotate on their axis. The sun and planets are made up of gases and have different atmospheres.
Therefore, option C. sun is at the center around which the planets revolve.
Learn more about the sun and planets here:
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Identify the acid, base, conjugate acid, and conjugate base in the following reaction.
HNO3 + NH3 + NO3 + NH
HNO3
NH3
NO3
NHA!
Base
Acid
Conjugate acid
Conjugate base
Please answer ignore the answers below in the pic they are wrong