Match the block to its correct density.
1 .
0.917 Kg/L
Block A
2 .
0.70 Kg/L
Block B
3 .
3.53 Kg/L
Block C
4 .
19.3 Kg/L
Block D
5 .
0.64 Kg/L
Block E
Answer:
Block A - 19.3
Block B - 0.64
Block C - 0.70
Block D - 0.917
Block E - 3.53
Hope this helps :)
Answer:
Block A - 19.3
Block B - 0.64
Block C - 0.70
Block D - 0.917
Block E - 3.53
Explanation:
When elements form ionic bonds, each atom is left with a __________________ outer shell.
WILL MAKE BRAINLIEST !!! help plssss
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!
Please help it’s due today. I will give brainliest.
Answer:
both conserve mass
Explanation:
Answer:
B.both conserve mass.
How do physical changes and chemical changes differ and how are they alike please at least 5 provide examples each for a brainliest!
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:
write a 3 sentence summary about DNA.
I’ll mark you as the brainiest answer !!
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.
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
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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please help me with this or I may get an F in chemistry :(
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!
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”
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
What is the density at 27 °C of 28.0 milliliters of a liquid that has a mass of 4.05 grams?
Answer:
4.05/28=0.144g/ml
Explanation:
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.
Answer:
Electrons are transferred in an iconic bond.
What are the purposes of theories in science?
b. What makes a theory a “good theory”?
please help
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).
5. How can you use the periodic table to help predict the types of bonds elements will form?
someone help me please, I will give you brainliest
Answer:
conserve mass.
Explanation:
a solid that is formed during a chemical reaction, typically solution
Answer:
precipitate
Explanation:
pretty sure it's right but sorry if i'm wrong:)
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.
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.
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
Answer:
A
Explanation:
The moon is connected to the ocoen
A student performs an experiment to study how sound waves are transmitted by placing a ringing buzzer inside a bell jar and sealing the jar. The student then connects the bell jar to a vacuum pump to remove the air from inside of the jar. The table shows the student’s observations before and after removing the air from the bell jar.
What can be concluded from the experiment?
A. Sound waves are transverse waves.
B. Sound waves do not transmit through material mediums.
C. Sound waves do not carry energy when they are transmitted.
D. Sound waves transfer energy through the vibration of particles in mediums.
Answer:
D. Sound waves transfer energy through the vibration of particles in mediums.
Explanation:
It can be concluded from the experiment that sound waves will only propagate through vibration of particles in mediums.
The particles of the medium is the air.
This type of wave is called a mechanical wave. A mechanical wave is one that requires material medium for their propagation.Option A ; Sound waves are transverse waves; while this might be true or not, we cannot ascertain that through this experiment described.
Option B: this negates the conclusion that should be drawn from the experiment.
Option C: we cannot draw this sort of conclusion from such an experiment as this.
Therefore, the right choice is that, sound waves transfer energy through the vibration of particles in mediums.
Write two uses of sublimation process?
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.
Im literally failing some classes can some one help me with them
Answer:in can
Explanation:
Answer:
What are your subjects you need help with?
This is not a multiple choice question
A student is examining an object in science class. It is pale yellow,brittle solid, with no shine. The sample is most likely a—
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?
Answer:
Chemical would be water splitting into just hydrogen and oxygen. Where as a physical change would be if it turned to ice.
Explanation:
Please HELP HELP ME!!!
If Beryllium has a mass number of 7 and atomic number of 4, how many protons does it have?
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
give an example how we use science in our every day life
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.
please help me quickly
Answer:
tell me the question i cant see the picture
Explanation:
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
SOMEONE ANSWER DA QUESTON
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Energy released in nuclear fusion is several 100 million times smaller than chemical reaction like the combustion process
o True
o False
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
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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Filling up a balloon with hot air.
Physical or chemical
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.