Explanation:
400×10=4000m
20×60=1200s
S=D÷T
S=4000÷1200
S=3.33m/s
B. Which of the following compounds can
NOT demonstrate the law of multiple
proportions ?
a. NO, NO
b. CO, CO2
c. H,O, H,O2
d. Na2S ,NaF
1
11
Answer:
The correct answer is:
d. Na2S, NaF
Answer:
CO2
Explanation:
How are a carrot, an amoeba, and a bacterium alike?
They are all made of cells.
They are eukaryotes.
They are prokaryotes.
They all live in soil.
Answer:
They all are made up of cells
Answer: They are all made of cells.
Explanation:
If brass is 25% copper, how many grams of copper are in 12 grams of brass
Why is it better to mix drops of solutions in a reaction plate rather than to mix milliliters of a solution in a flask?
Explanation: Hey Sonia, I see I'm not the only one at school struggling in Chem. My best guess is to minimize the likelyhood and size-amount of a chemical reaction.
Explain why all models have limitations.
Explanation:
The limitations of model based on Experimental design and parameter
All models have limitations because they simplify complex real-world phenomena, omitting certain details or factors to make them manageable and understandable.
Limitations of modelsAll models have limitations because they are simplified representations of complex systems or phenomena. To make models more manageable and understandable, certain details, variables, or interactions must be excluded.
This simplification can lead to discrepancies between the model and reality, limiting its accuracy and applicability. Additionally, models are often based on existing knowledge, which may be incomplete or subject to change.
As a result, models serve as valuable tools for understanding and prediction but should be used with caution, acknowledging their inherent simplifications and potential shortcomings when applied to real-world scenarios.
More on models can be found here: https://brainly.com/question/33240027
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*BRAINLIEST* Is calcium nitrate solution an element, compound, homogenous mixture, or heterogeneous mixture?
Answer:
It's a compound.
Answer:
Homogeneous mixture.
Explanation:
All solutions are homogeneous mixtures; therefore, a calcium nitrate solution would be a homogeneous mixture.
In terms of particles, what is the mass number equal to? (The mass is 12)
Answer:
The number of protons plus the number of neutrons
Explanation:
Answer:
The mass number is equal to the total number of protons and neutrons in the nucleus of an atom.
Explanation:
True or False: Electrons in each lower level are filled before electrons fill
the higher energy level.*
1. True 2. False
the answer is 1....true
How did scientists find out about the the evolution of the atmosphere?
Consider the statement below.
“When nitrogen is liquefied, heat is released.”
Is this statement true or false?
Answer:
True
Explanation:
It is true because heat is released when a gas changes to a liquid.
Answer:
True
Explanation:just took the test
I have a block of gold and the density is 13.54g/ml If I cut the block in half what is the density of the smaller pieces of gold
Answer:
Density is the same
Explanation:
The density remains the same because cutting the object in half will divide the mass & volume by the same amount. Also, the density of a substance remains the same no matter what size it is.
Name the four types of friction. Provide one example not used in your lesson for each type.
what is a hypothesis?
Answer:
A suggested solution for an unexplained occurrence.
Explanation:
A hypothesis is an educated guess, because you don't know what will happen / what is going to happen, you are just making a guess on what you think will happen. It is a solution for an unexplained occurrence.
A sample in lab displaces 15 mL of water in a graduated cylinder. When placed on a scale the mass is 8.7 g. What is the density of the sample.
Answer:
0.58 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
volume = 15 mL
mass of object = 8.7 g
We have
[tex]Density = \frac{8.7}{15} [/tex]
We have the final answer as
0.58 g/mLHope this helps you
what does 2 in the chemical formula CaCl2 mean?
Answer:
The answer is
Explanation:
Calcium chloride is created from the ionic bonds that form between calcium cations and chloride anions. Calcium ions have a charge of +2, while chloride ions have a charge of -1. Calcium chloride salts can also form crystals based on these same ionic properties.
Hope this helps.
Please mark my answer as brainliest?
Which statement best describes the movement of Wind?
A. air moves from high pressure to low pressure
B. air moves from high temperature to low temperature
C. air moves from high volume to low volume
Answer:
A. Air moves from high pressure to low pressure
What 2 tools do we use to measure volume?
Answer:
u
Explanation:
Which element is represented by the following Bohr model? *
p = 11
n 12
Answer:
A sodium atom.
Explanation:
A sodium atom contains 11 protons and 12 neutrons and its mass is 23.
The SI base unit for mass is the gram. TRUE FALSE
Explanation:
Hey there!!
Actually gram is also a measurement unit used in CGS system of measurement.
But in SI system, there is use og kilogram in measuring mass.
{There is use of gram as a base}.
So, the answer is True.
Hope it helps..
How much is one liter
Answer:
1 litre = 1000 millilitres
electrovalent compounds are electrolysed but covalent compounds are not electrolysed, why ?
..so plz like it and follow me ♥
Tony ran at a constant speed of 10 m/s for a total of 60 seconds. How far did he run?
According to the speed formula, distance that Tony ran at a constant speed of 10 m/s for a total of 60 seconds is 600 meters.
What is speed?The speed (commonly referred to as v) of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero. Speed is not the same as velocity.
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph). For air and marine travel, the knot is commonly used.
Learn more about speed,here:
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which is heavier Aluminum (Al) or Iron (Fe)
Answer:
iron, it is more dense than aluminum
Explanation:
Answer:
Aluminium
Explanation:
The more gravity pulls down on an object the less the object weighs true or false
false
Explanation:
The more gravity pulls down on an object it gets heavier. Weight is just the amount of force gravity is putting on something. So if gravity is pulling it down more ut would get heavier.
Answer:
False
Explanation:
The move gravity there is pulling on something, the more it'll weigh. The less gravity something or someone has, the less they will weigh. For example, on the moon things weigh less because there is less gravity pulling on objects.
Please help me answer all of this! (Will give brainliest answer and hearts) Please and thank you!
Answer:
Hi there!
Your answers are:
1. Physical
2. Chemical
3. Chemical
4. Chemical
5. Chemical
6. Physical
7. Physical
8. Chemical
Explanation:
Physical, aka mechanical, digestion occurs due to ACTIONS from the body! This can be contracting muscle walls to move it along or the use of teeth to crush food. Chemical digestion is due to some acid or chemical that the body makes! This breaks down food so the body can process it.
I hope this helps!
4. Circle the letters of elements that are required for a measurement to
make sense.
a. scientific notation
b. numbers
с. exponents
d. units
Answer:
(b) numbers and (d) units
Explanation:
To measure any quantity, numbers and units are required. It can be understood with an example.
We measure a length of a piece of wood as 5 cm. In this case 5 is a number and centimeters or cm is a unit in which we measure its length. It means for any measurement, number and units are important elements that are required to make sense.
Hence, the correct options are numbers and units.
What could J. J. Thomson conclude from his experiments? Atoms are mostly empty space. Most of the mass of the atom is concentrated in the center. Atoms must balance positive and negative particles. Atoms are indivisible.
Answer:
atoms must balance positive and negative particles
Explanation:
Answer:
C: Atoms must balance positive and negative particles.
Explanation:
As the temperatures increase density generally ?
A. Increase
B. Decrease
C. Remain same
what is the density of an 85.7 g sample of unknown susbstance if the sample occupies 32.4mL
Answer:
m= 85.7g
V= 32.4mL
d= m/V
d= 2.65g/mL
how do you convert L to mL
Answer:1 Liter (L) is equal to 1000 milliliters (mL). To convert liters to mL, multiply the liter value by 1000. For example, to convert 2 liters to mL, multiply 2 by 1000, that makes 2000 mL is 2 L.
Explanation:
