Answers
Answer:
4 Ethanol has a boiling point of 89 C at standard pressure.
Related Questions
A driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be ___.
Group of answer choices
unbalanced
small
large
balanced
Answers
Answer:
balanced
Explanation:
A driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be balanced. Thus, the correct option for this question is D.
What is Cruise control?Cruise control may be defined as a type of system that significantly controls the speed of a motor vehicle automatically. It maintains the speed of the vehicle constant without the use of the accelerator pedal once you selected a specific speed.
The speed of the vehicle must remain constant during the course of time. This is possible when the force acting on the driver must be in a balanced state. Otherwise, it will be difficult for the driver to sustain the same speed for a long time.
Therefore, a driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be balanced. Thus, the correct option for this question is D.
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What provides the energy that drive convection in the atmosphere and
oceans? A.reflected light from the moon.B. Direct rays of the sun.C. Heat from the earth core
Answers
Answer:
A
Explanation:
The moon is connected to the ocoen
Which is most likely a physical change? A. cutting a substance into four pieces or B. burning a substance into ash and smoke or C. reacting a substance chemically to form a new substance or D. combining a substance with water to make rust
Answers
Answer:
A. cutting a substance into four pieces
Explanation:
The others include burning, reacting, and rust which make up a chemical change.
Cutting a substance into four pieces indicates a physical change. The correct option is A.
What is physical change?Even before to and after a physical change, the material implicated is unique architectural the same.
Physical changes include texture, shape, heat, and the beginning of a change in the state of matter. The texture of a substance influences how it feels.
A physical change is simply a change in appearance. The situation has not changed since the change.
Physical change can be seen in the use of cutting paper, melting butter, dissolving salt in water, and breaking glass.
Chemical reaction takes place when bonds among molecules or atoms are broken or formed.
This implies that one material with a specific set of properties is transformed into another substance with a different set of properties.
Thus, the correct option is A.
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someone help me please, I will give you brainliest
Answers
Answer:
conserve mass.
Explanation:
5. How can you use the periodic table to help predict the types of bonds elements will form?
Answers
You can look how far apart the two atoms forming the bonds are in the periodic table. If one atom is on the far left Group 1 or 2 and the other is on the far right Group 5, 6, or 7, then the atoms will have large differences in with form an ionic bond.
If Beryllium has a mass number of 7 and atomic number of 4, how many protons does it have?
Answers
Answer:
4
Explanation:
Answer:
4
Explanation:
So the atomic number is still the proton number and it is always smaller than the atomic mass so the proton number is 4.
HOPE IT HELPED
please help me quickly
Answers
Answer:
tell me the question i cant see the picture
Explanation:
Plz help! The best answer will be marked as brainliest!
Make a funny sentence of alloys for Magnesium
Here is an example for Mercury, it HAS to for Magnesium
“I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Answers
Answer:
Megan trailer said pass the maga mic so I can sing, I'll call the mic magnesium
Explanation:
Get it cuz a mic is made out of magnesium
Does acid rain make new substances?
Answers
Answer:
Over the past few decades, humans have released so many different chemicals into the air that they have changed the mix of gases in the atmosphere. ... In addition, the exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air.
Filling up a balloon with hot air.
Physical or chemical
Answers
Answer:
Physical.
Explanation:
Nothing changes in a chemical state just adding hot air to a balloon.
I'm pretty sure this is classified as a chemical change.
A force is a push or pull that makes it possible to move an object. A force can also be used to
change the direction that an object is moving. The amount of force put on an object will
determine how far and fast the object will move. Nothing moves without some kind of force!
If you pull or push something, you are the force that is creating movement. The more you
push or pull, the farther and faster an object will go. But the heavier an object is, or the
more friction working against its movement, the harder it will be to move it.
What causes objects to move?
No
Answers
Answer:Forces include gravity, friction, and applied force. Force causes changes in the speed or direction of motion.
Explanation:
Answer:
Its force, Just did it. 100%
Explanation:
No explaination needed. I got it right.
If Isaiah boiled 10 liters of water at 100°C, at which temperature would he boil 20 liters of water?
Group of answer choices
200°C
10°C
20°C
100°C
Answers
SOMEONE ANSWER DA QUESTON
Please help it’s due today. I will give brainliest.
Answers
Answer:
both conserve mass
Explanation:
Answer:
B.both conserve mass.
LMK ASAP PLS
Energy released in nuclear fusion is several 100 million times smaller than chemical reaction like the combustion process
o True
o False
Answers
How do physical changes and chemical changes differ and how are they alike please at least 5 provide examples each for a brainliest!
Answers
Answer:
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
How are physical and chemical changes similar and different? (compare and contrast) (Physical and chemical changes are similar because matter experiences a change in state, Physical changes are different because matter remains the same substance, just in a different state, whereas chemical changes change the matter
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical changes.
Explanation:
give an example how we use science in our every day life
Answers
Answer: When you turn a light on it becomes bright :)
In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be substituted by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled switches and dimmers. Light switches are also found in flashlights, vehicles, and other devices.
We combine certain ingredients and certain measurements to make delicious foods and drinks. And when we add heat, it makes bread rise, causing a chemical reaction because you cannot reverse a cake back into the individual ingredients.
Hope this helps! :3
(This is not a sample from anything. This is in my own words, so I’m not sure if it is right, but this is an example of how we use science.)
PLZ DON"T JUST PICK AN ANSWER I REALLY NEED HELP
5. Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remains, about how much time has passed?
A. 15 hours
B. 30 hours
C. 45 hours
D. 60 hours
Answers
Answer:
60 hours
Explanation:
18.0 __15__ 9 __15__ 4.5 __15__ 2.25 __15__ 1.125g
15(4)= 60
Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remain , then it has been passed in 60 hours. So option D is correct.
What is half life and decay law ?The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T₁ ÷ 2, and the decay constant is given by T₁/2 = 0.693/λ
According to radioactive decay law, the rate of decay of radioactive atoms at any instant is directly proportional to the number of atoms present at that instant.
dtd N ∝ N
dtd N = λ N
where, N is number of integrated nucleus present in the sample at any time t and λ is decay constant.
Thus ,option D 60 hours is correct.
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A student is examining an object in science class. It is pale yellow,brittle solid, with no shine. The sample is most likely a—
Answers
Answer: non metal
Explanation:
Nonmetals are dull, possess high ionization energies and electronegatives and are typically poor electricity conductors as they're insulators.
Non metals are also brittle and possess low melting point. Therefore, with the explanation, the sample is most likely a non metal.
water is a compound with a chemical formula h2o. compare a physical change involving water with a chemical change involving water. how do the changes differ?
Answers
Answer:
Chemical would be water splitting into just hydrogen and oxygen. Where as a physical change would be if it turned to ice.
Explanation:
What are the purposes of theories in science?
b. What makes a theory a “good theory”?
please help
Answers
Answer:
Scientific theories are testable and make falsifiable predictions. They describe the causes of a particular natural phenomenon and are used to explain and predict aspects of the physical universe or specific areas of inquiry (for example, electricity, chemistry, and astronomy).
A good theory in the theoretical sense is (1) consistent with empirical observations; is (2) precise, (3) parsimonious, (4) explanatorily broad, and (5) falsifiable; and (6) promotes scientific progress (among others; Table 1.1).
What is the density at 27 °C of 28.0 milliliters of a liquid that has a mass of 4.05 grams?
Answers
Answer:
4.05/28=0.144g/ml
Explanation:
Please HELP HELP ME!!!
Answers
a solid that is formed during a chemical reaction, typically solution
Answers
Answer:
precipitate
Explanation:
pretty sure it's right but sorry if i'm wrong:)
please help me with this or I may get an F in chemistry :(
Answers
Answer:
Subconscious - psychic activity just below the level of awareness
Election - the act of electing someone
Explanation:
I hope this helped enough, good luck in chemistry!
Im literally failing some classes can some one help me with them
Answers
Answer:in can
Explanation:
Answer:
What are your subjects you need help with?
Write two uses of sublimation process?
Answers
Answer:
Explanation:
Practical Applications of Sublimation
Sublimation and erosion cause ablation, a process that wears down glaciers. Sublimation of iodine may be used to reveal latent fingerprints on paper. Sublimation is used to purify compounds. ... Because dry ice sublimates so readily, the compound is used to produce fog effects.
write a 3 sentence summary about DNA.
I’ll mark you as the brainiest answer !!
Answers
Answer:
DNA is a complex, long-chained molecule. DNA contains the genetic blueprint for building and maintaining all living organisms. Found in nearly all cells, DNA carries the instructions needed to create proteins, specific molecules essential to the development and functioning of the body.
When elements form ionic bonds, each atom is left with a __________________ outer shell.
WILL MAKE BRAINLIEST !!! help plssss
Answers
Answer:
Each atom is left with a complete outer shell. An ionic bond forms between a metal ion with a positive charge and a nonmetal ion with a negative charge.
HOPE DAT HELPS BRO!
How do ionic bonds differ from covalent bonds?
Protons are transferred in an ionic bond.
Protons are shared in an ionic bond.
Electrons are shared in an ionic bond.
Electrons are transferred in an ionic bond.
Answers
Answer:
Electrons are transferred in an iconic bond.
Question 1: A new fat-burning pill for men is introduced. To test for effectiveness, 50 men are given the pill and 50 men are given a placebo. After 6 months, the men's body fat percentage is calculated. Identify the control group, the manipulated variable, and the responding variable. Explain how you can identify each.
Answers
Answer:
Explanation:
In the scenario that is being described the control group would be the 50 men that have been given the placebo because they are the ones that should not have any effects from the placebo and that is by design. The manipulated variable is the new fat-burning pill because it is the one that the scientists can change and modify to try and achieve the desired results. Lastly, the responding variable are the 50 men who are given the new fat-burning pill because they are the ones that will be responding to the effects of the pill and providing the data needed by the scientists.