The car's velocity after 5s : 10 m/s
Further explanationGiven
velocity=v=72 km/h=20 m/s
time=t = 5 s
acceleration=a = -2 m/s²
Required
velocity after 5s
Solution
Straight motion changes with constant acceleration
[tex]\tt v_f=v_i+at[/tex]
vf=final velocity
vi = initial velocity
Input the value :
[tex]\tt v_f=20+(-2).5\\\\v_f=20-10\\\\v_f=10~m/s[/tex]
The car is decelerating (acceleration is negative) so that its speed decreases
Answer:
The Velocity after 5s if its acceleration is -2m/s is 10 m / s.
Explanation:
The motion equation is given by v = u + a x t.
Initial speed (u) is equal to 72 km/h.
Acceleration (a) equals 2 m/s2.
Time (t) = 5s.
Changing the initial velocity's direction from km/h to m/s:
1 km/hr is equal to 1000 m/3600 s/5/18 m/s.
velocity (u) is equal to 72 x (5 / 18) m/s, or 20 m/s.
The motion equation can be used to calculate final velocity.
To change values in the equation of motion, do the following:
Final Velocity (v) = u + a x t
v = u + a x t
v = 20 m/s + (-2 x 5) m/s
v = (20 - 10)m/s v = 10 m/s
As a result, the car's speed after 5 seconds will be 10 m/s.
To know more about Velocity,
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What are chemical equations used to represent?
Answer:
A chemical equation is the symbolic representation of a chemical reaction. The reactants (the starting substances) are written on the left, and the products (the substances found in the chemical reaction) are written on the right.
Explanation:
pliz mark brainliest
Explanation:
chemical equations are used to represent a certain reaction between reactants to form products.
What mass of calcium chloride is required to prepare 3.20 L of 0.850 M of calcium chloride solution?
Answer:
301.92 g of CaCl2.
Explanation:
The following data were obtained from the question:
Volume of CaCl2 solution = 3.20 L
Molarity of CaCl2 solution = 0.850 M
Mass of CaCl2 =?
Next, we shall determine the number of mole of CaCl2 in the solution. This can be obtained as illustrated below:
Volume of CaCl2 solution = 3.20 L
Molarity of CaCl2 solution = 0.850 M
Mole of CaCl2 =?
Molarity = mole /Volume
0.850 = mole of CaCl2 /3.20
Cross multiply
Mole of CaCl2 = 0.850 × 3.20
Mole of CaCl2 = 2.72 moles
Finally, we shall determine the mass of the CaCl2 needed to prepare the solution as follow:
Mole of CaCl2 = 2.72 moles
Molar mass of CaCl2 = 40 + (2×35.5)
=40 + 71
= 111 g/mol
Mass of CaCl2 =?
Mole = mass /Molar mass
2.72 = mass of CaCl2 /111
Cross multiply
Mass of CaCl2 = 2.72 × 111
Mass of CaCl2 = 301.92 g
Therefore, 301.92 g of CaCl2 is needed to prepare the solution.
In a molecule of calcium sulfide, calcium has two valence electron bonds, and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium sulfide?
A. one
B. two
C. three
D. four
E. none
Also, state why.
Answer:
E
because it forms the ionic bond but not covalent.
A sample of gas in a balloon has an initial temperature of 42 ∘C and a volume of 1.10×103 L . If the temperature changes to 86 ∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?
Answer:
1250L or 1.25*10^3
Explanation:
Use the combined gas law, [tex]\frac{P_{1} V_{1}}{T_{1} }[/tex]=[tex]\frac{P_{2}V_{2}}{T_{2} }[/tex]
Put the value for the temperature(in Kelvin) and volume, and you can just put 1 for P1 and P2 because it stays the same.
I'll assume that you meant to put 1.10*10^3L
A paint chip is placed in ethanol and curls what type of paint is it
Answer:
it is probably acrylic or latex
Explanation:
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the type of paint is acrylic or latex.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. If the chip remains flat when put in ethanol, it is probably an oil-based paint. If the chip curls, it is probably acrylic or latex. So, The type of paint is acrylic or latex.
Therefore, the type of paint is acrylic or latex.
To learn more about chemical compound, here:
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In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?
18 g
54 g
72 g
90 g
Answer:
54 g
Explanation:
Given data:
Mass of carbon = 18 g
Mass of CO₂ = 72 g
Mass of oxygen needed = ?
Solution:
Chemical reaction:
C + O₂ → CO₂
according to law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
In a similar way,
C + O₂ → CO₂
18 g + X = 72
X = 72 -18
X = 54 g
Thus, 54 g of O₂ are required.
Answer:
54g
Explanation:
Which pair of elements will form a covalent bond? A. Aluminium and Chlorine B. Carbon and Sulfur C. Lithium and Oxygen D. Potassium and Chlorine
Explanation:
Aluminum and chlorine form covalent bond.
Therefore,
Option A is correct✔
What is the mass, in grams, of 50.0L of N2 at STP?
Hey there!:
Molar mass N₂ = 28.0134 g/mol
28.0134 g ------------------- 22.4 L (at STP )
mass N₂ -------------------- 50.0 L
mass N₂ = 50.0 x 28.0134 / 22.4
mass N₂ = 1400.67 / 22.4
mass N₂ = 62.529 g
Hope this helps!
Describe the characteristics
of the different sections
(families) of the periodic
table
Answer: The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods
The greater the resistance, the less current there is for a given voltage.
Please select the best answer from the choices provided
True
False
❤️❤️❤️
Answer:
The answer is True.
Molecular orbital diagram for Fe.
ANSWER;
1s22s22p63s23p63d64s2
EXPLANATION;
Molecular orbital diagram for Fe.
In writing the electron configuration for Iron the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Iron go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s if now full we'll move to the 3p where we'll place the next six electrons. We now shift to the 4s orbital where we place the remaining two electrons. After the 4s is full we put the remaining six electrons in the 3d orbital and end with 3d6.
Therefore the Iron electron configuration will be 1s22s22p63s23p64s23d6.
Note that when writing the electron configuration for an atom like Fe, the 3d is usually written before the 4s. Both of the configurations have the correct numbers of electrons in each orbital, it is just a matter of how the electronic configuration notation is written
Therefore we have 1s22s22p63s23p63d64s2
Converting benzoic acid to phenylmethanol
Answer:
The Conversion of Benzoic acid to Benzyl alcohol in presence of Potassium Permanganate is an oxidizing reaction where potassium permanganate is strong oxidizing agent.This reaction occurs in basic medium in presence of sodium carbonate.This reaction gives best yield in acidic medium.But it takes longer duration for reaction to complete as compared to basic medium.less duration is required which is necessary for laboratary scale
Please help will give brainliest
Answer:
the answer id D
Explanation:
i dont know im just living here 5
The Earth's hours is it spinning on its axis, and it takes 24
Answer:
yes? is there a question...
Explanation:
Answer:
24 hours
Explanation:
Earth spins on its axis once in every 24-hour day. At Earth's equator, the speed of Earth's spin is about 1,000 miles per hour (1,600 km per hour).
someone plz help me write notes (images attached)
Answer:
kya karna parega hume....???
The density of a gas is 1.26 g/L at STP. What is the mass of 1 mole? What could this gas be?
Answer: Molar mass=28.224g/mol, The gas could be Nitrogen gas
Explanation:
Density is calculated as Molar mass/ Molar Volume
Recall that
One mole of an ideal gas at (STP) standard temperature and pressure = 22.4 liters (in Volume)
Given That Density =1.26 g/L
Volume = 22.4L at STP,
Molar mass = Density x Molar Volume
= 1.26 g/L x 22.4L =28.224g
Therefore, if 1 mole of this gas has a mass of 28.224g then its molar mass is equal to 28.224g/mol
The molar mass of Nitrogen = 28.014 g/moL, so we can conclude the the gas could be Nitrogen
How can the rate of a reaction be increased?
(A) decreasing the amount of reactants
(B) having more surface area
(C) diluting a solution
(D) lowering the temperature
Explanation:
Rate of reaction can be increased by having more surface area.
Therefore,
Option B is correct✔
Answer:
b
Explanation:
Condensation is a phase change from?
Answer:
gas to liquid
Explanation:
think of water vapor condensing on glass when you breathe on it for a while.
Help! Please! Fast! Please!
Answer:
The amplitude is higher for wave 2
Explanation:
Amplitude is the height of the wave at the greatest point
Which activity is an example of chemical change?
What is generally true of atoms with relatively large atomic radii?
Answer:
Large atoms hold their electrons very tightly. ... Large atoms tend to be found on the right side of their period on the periodic table.
Explanation:
Answer:
Explanation:
Large atoms tend to have a low ionization energy and a low electron affinity.
How does Gas Trapping bottles Monitor Volcanos?
( put in your own words don’t look up on internet )
I will give brainlst If you answer correctly.
Answer: the pressure releases gas. The two most abundant gases are sulfur dioxide and carbon dioxide, and if levels of these gases increase,
Explanation:
Which one is true? Elements in the same row have the same number of:
Explanation:
Elements in same row (i.e, from left to right) have the same number of electron shells.
When solid S1 is heated, it breaks up into gas G and another solid S2. The solids S1 and S2 and the gas G are all pure substances. On the basis of this information alone, which substance or substances must be compounds? A.S1 only B.S2 only C.S1 and S2 D.S1 and G
Answer:
A.S1 only
Explanation:
A compound is one of the pure substances (other being element) that forms when two or more atoms of an element are chemically combined. According to this question, a solid S1 is heated and it breaks up into gas G and another solid S2 as follows:
S1 (s) ➡ G (g) + S2 (s)
Based on the information in the questio, the solids S1, S2 and the gas G are all pure substances. However, since solid S1 broke down into two other pure substances, it means solid S1 is originally a chemical combination of both products, which denotes a COMPOUND. Note that Gas G and Solid S2 are most likely elements.
Cubic zirconia is a substance produced in a laboratory. It looks nearly identical to a diamond. Why is it not a mineral?
It has no definite chemical formula.
It is not crystalline in structure.
It is not a solid.
It is not naturally occurring.
Answer:
it is not naturally occuring
Will give brainliest
Answer:
c. both gases have the same number of molecules
brainliest?
about how much of the visible side of the moon is lit up during a full moon?
A. Three fourths
B. One fourth
C. None of it
D. All of it
Answer:
D
Explanation:
i learned this in elementary
What is the concentration of a solution made by diluting 35 mL of 6.0 M HCl to a final volume of 750 mL?
If 2.49g of CuNO3 is dissolved in water to make O.830M solution, what is the volume of the solution in milliliters?
How many moles of NaOH are present in 13.5mL of 0.17 M NaOH?
Answer:
1. 0.28M
2. 24mL
3. 0.002295moles of NaOH.
Explanation:
1. The 6.0M HCl solution is diluted from 35mL to 750mL, that is:
750mL / 35mL = 21.43 times
The 6.0M HCl solution is diluted 21.43 times, the final concentration is:
6.0M / 21.43 = 0.28M
2. First, we need to convert grams of CuNO3 to moles and then, as molarity is moles per liter we can solve for volume of solution in liters and convert it to mililiters:
Moles CuNO3 -Molar mass 124.9g/mol:
2.49g * (1mol / 124.9g) = 0.020 moles of CuNO3
Volume is:
0.020 moles * (1L / 0.830mol) = 0.0240L * (1000mL / 1L) = 24mL
3. In 13.5mL = 0.0135L of 0.17M NaOH the moles are:
0.0135L * (0.17mol / L) = 0.002295moles of NaOH
Anything that has mass and takes up space is what
0)
A
tass
B)
volume
)
density
D)
matter
Answer:
D - Matter
Explanation:
Matter is defined as anything that has mass and takes up space. Matter is basically liquid soilds and gasses!
(I hope this helps :>)
Create an atom diagram using the Bohr model. Directions Choose three elements from the following list. Use a periodic table to determine the number of protons, neutrons, and electrons. Draw a diagram of each element you have selected. Use a separate piece of paper for each element. Be sure your drawing is neat, legible, and accurate. Use this data table to record information about each element. Element #1 Element #2 Element #3 Element #4
Answer:
Explanation:
proposed an early model of the atom as a central nucleus containing protons and neutrons being orbited by electrons in shells. As previously discussed, there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically-neutral atoms, the number of electrons is the same as the number of protons. Each element, when electrically neutral, has a number of electrons equal to its atomic number.
Answer:
You can check diagram with number of proton neutron and electrons
Explanation: