Answer:
The answer is option AExplanation:
To find the time taken given the velocity and distance covered we use the formula
[tex]t = \frac{d}{v} \\ [/tex]
From the question we have
[tex]t = \frac{405}{90} \\ [/tex]
We have the final answer as
4.5 sHope this helps you
helpppppppppp please
what did max planck discovery?
Answer:
Max Planck discovered the quantum of action
Explanation:
A block weighing 13.15 grams has sides of 11.5 cm, 5.75 cm, and 8.44 cm. What is the density of the block in g/cm?
0.519 g/cm3
0.0236 g/cm3
42.4 g/cm
1.95 g/cm
Answer:
B. or .0236
Explanation:
Multiply the 3 sides to get 558.095, then divide the mass and volume to get .0236
WHAT MAKES ELECTRONS JUMP TO OTHER ORBITS AROUND THE NUCLEUS THEN FALL AGAIN
Answer:
Explanation:
Electrons absorb energy in photons. This makes the eclectron excited. An electron in an excited state can release energy and fall to a lower orbit
Urgent please help!!
Which of these is a chemical property of a substance?
A) texture
B) ductility
C) reactivity
D) conductivity
Answer:
reactivity
Explanation:
2) A student was working on an investigation to measure the relative activity
of an enzyme at various pH values. He collected the following data:
pH 2, enzyme activity 10; pH 8, enzyme activity 50;
pH 12, enzyme activity 10; pH 4, enzyme activity 20;
pH 6, enzyme activity 40; pH 10, enzyme activity 40
Answer:
THE LAST ONE
Explanation:
An object is either copper or brass. The density of copper is 8.96g/ml. The density of brass is 8.73g/mL. I find that my object is 10.08
and has a volume of 1.15mL. What is my object made of?
Your answer:
O Copper
O Brass
O Cannot tell from the information given
what is the estimated digit in the number 0.0643
Answer:
3
Explanation:
Answer:
There are 3 estimated digits.
Explanation:
Wich statement best describes the progress of science
Answer:
Scientific ideas are changed when better ones are found.
Explanation:
3. Except for the bolt, note the difference between the calculated volumes and the volume
found by the displacement method. Which method is more accurate? Why?
Answer:
Yes Because the calculated volume is more accurate because you are able to measure the smaller dimensions.
~Apex lab
what best explains the cause of strong winds on a island?
You crumple a piece of paper in your hands. Not all of the kinetic energy from your hands is used to crumple the paper. Where does the rest of the energy go?
A. It is transformed into sound energy.
B. It is transformed into light energy.
C. It is transformed into electrical energy. D. It is transformed into magnetic energy.
Answer:
A
Explanation:
When you crumble a piece of paper it make a sound plus i just did on apex
When we crumple a piece of paper in our hands, a part of the energy is transformed into sound energy. Therefore, option (A) is correct.
What is sound energy?Sound transmits through the medium such as liquids, gases, and plasma in the form of longitudinal waves or compression waves. It requires a medium to propagate as it can travel through solids as both longitudinal and transverse waves.
Transverse sound waves exhibit waves of alternating shear stress perpendicular to the direction of propagation while Longitudinal sound waves exhibit alternating pressure deviations leading to compression and rarefaction.
Generally, waves move matter up and down but do not carry along. When we crumple the paper with our hands the kinetic energy of our hands is used to deform the paper but at the same time, we can listen to some sound which indicates that some energy is transformed into sound energy.
Learn more about sound, here:
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Alien Periodic Table
Answer:
IT IS REAL
Look it up
Answer:
look close the answers are circled in blue
the answer to number 2 is element #14, Yorkel
What volume of O2 would be required to react with 4.6 grams of Na
Volume of O₂ = 1.12 L
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Reaction
4Na+O₂ ⇒ 2Na₂O
Ar Na = 23 g/mol
mol Na :[tex]\tt mol=\dfrac{4.6}{23}=0.2[/tex]
mol O₂ :[tex]\tt \dfrac{1}{4}\times 0.2=0.05[/tex]
Assume at STP (0 C, 1 atm), 22.4 L for 1 mol , then volume of O₂ :
[tex]\tt 0.05\times 22.4=1.12~L[/tex]
which of the following affects self esteem? O home, school, community and cultural environments O social interactions with family friends and others O media, tv, social networking sites all the above
Answer:
All the above
Explanation:
Can someone check if I did this right pls
Answer:
It's right
Explanation:
why is diamond hard
The outermost shell of each carbon atom has four electrons. In diamond, these electrons are shared with four other carbon atoms to form very strong chemical bonds resulting in an extremely rigid tetrahedral crystal. It is this simple, tightly-bonded arrangement that makes diamond one of the hardest substances on Earth.
Answer: Diamond is hard due to its giant covalent lattice and it has many strong covalent bonds.
Explanation:
I WILL GIVE U BRAINLIEST IF U HELP ME!!!!!
Answer:
your awnser is B cutting back
I just need an answer for question 3,4 and 5. thank you so much.
2. What type of bonding would be expected between the following atoms?
a. Li and F
c. I and Br
b. Cu and S
d. S and O
Considering the definition of covalent and ionic bond, the type of bonding that would be expected between the following atoms is:
Li and F: Ionic Bond I and Br: Covalent Bond Cu and S: Ionic Bond S and O: Covalent BondThe covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas.
An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.
Taking into account the previous definitions, it is first necessary to know if the elements are metallic or non-metallic:
Lithium Li: Metallic atoms Flour F: Non-metallic atoms Iodine I: Non-metallic atomsBromine Br: Non-metallic atomsCopper Cu: Metallic atoms Sulfur S: Non-metallic atoms Oxygen O: Non-metallic atoms
Now you can determine the type of bond of the following pairs of elements:
Li and F: Metallic atoms - Non-metallic atoms: Ionic Bond I and Br: Non-metallic atoms - Non-metallic atoms: Covalent Bond Cu and S: Metallic atoms - Non-metallic atoms: Ionic Bond S and O: Non-metallic atoms - Non-metallic atoms: Covalent BondLearn more:
https://brainly.com/question/7869439?referrer=searchResultshttps://brainly.com/question/14526070?referrer=searchResultshttps://brainly.com/question/2468807?referrer=searchResultshttps://brainly.com/question/2468807?referrer=searchResultsWhich of the following electromagnetic waves has the most energy on the electromagnetic spectrum?
O A Infrared
O B. X-ray
O C. Gamma
O D. Radio
Answer:
Gamma rays
Explanation:
The waves with higher frequencies will have higher energies and gamma waves have the highest frequencies on electromagnetic scale ,because of this reason gamma waves is the answer.
How was Bohr’s atomic model different from rutherfords atomic model
A. Bohr’s model accounted for electrons that have different charges
B. Bohr’s model could explain the structure of the nucleus
C. Bohr’s model showed that electron orbits had distinct radii
D. Bohr’s model could explain the wave nature of electrons
E. Bohr’s model proved that atoms are unstable in the nature
Answer:
C. Bohr’s model showed that electron orbits had distinct radii
Explanation:
In Rutherford's atomic model, the electrons moved on arbitrary orbits, which was only due to the condition that the Coulomb force acts as a radial force. In Bohr's atomic model, only very specific orbits were allowed, which were determined by Bor's quantum condition.
Answer:
C i agree
Explanation:
Most metals are NOT ____ ? Liquid at room temperature, ductile, malleable, good conductors of heat and electricity.
Most metals are not liquid at room temperature. Therefore, option A is correct.
Most metals are not liquid at room temperature, except for a few specific exceptions such as mercury (Hg) and gallium (Ga). These metals have relatively low melting points, which allows them to exist in a liquid state at or near room temperature.
The majority of metals, however, exhibit a solid state at room temperature. This solid state is characterized by a regular arrangement of atoms or ions in a crystal lattice structure. The strength of metallic bonds holds the atoms together, giving metals their solid and rigid form.
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Eugene describes the physical property of a material as “sweet and floral.” What physical property of the material is Eugene most likely observing?
boiling point
shape
hardness
odor
Answer:
D odor
Explanation:
Answer: odor
Explanation:
How can we gather more evidence about weather lava or water formed the channel on Mars
An object has a mass of 20 g and volume of 10 cm. Enter the numerical value for the density of the object in units of g/cmº
Answer:
density = 2g/cm³
Explanation:
density = mass/volume
mass = 20g
volume = 10cm³
density = 20g/10cm³
density = 2g/cm³
Which pair of atoms are isotopes of each other?
a
oxygen-16 and oxygen-18
carbon-14 and nitrogen-14
iodine-131 and iodine-131
e
d
radium-222 and radon-222
Answer:
b sorry if im wrong
Explanation:
hope it helped
Why is it important for you to know the properties and chemical formulas of molecular and ionic compounds? How will this affect your ability to choose one product over another or make decisions about whether to use a certain substance like bleach or drain cleaner? How has learning about atomic structure and compounds changed your understanding of the world around you?
Answer:
See explanation
Explanation:
It is important to know the properties and chemical formulas of ionic and molecular compounds because, knowledge of the properties of a compound aids you in deciding how to use the compound, how to store it and how dangerous it can be. Knowledge of its formula is the first step towards identifying its properties since most chemicals occur in groups having similar chemical/physical properties.
Knowledge of the chemical properties and formula of bleach and drain cleaner will help you to decide which product is a better cleaning agent based on its chemical composition. This will help you as the user to make better decision.
Learning about atomic structure has made me to understand that all matter in the universe are composed of atoms. indeed, certain occurrences in nature can only be explained on the basis of atoms involved.
Plz help!
Covalent bonding is referred to as “sharing” electrons. Is it really sharing? Why or why not?
Answer:
yes
Explanation:
because they will bond in order to gain more stability which is gained by forming a full electron shell
PLEASE ANSWER
A train travels at an average speed of 25 miles per hour. How long does it take the train to travel 2000 miles
Answer:
80 hours. 2,000 ÷ 25 = 80
Which periodic gruop has the smallest atomic radiis
Answer:
Helium
Explanation: