Answer:
False
Explanation:
a human can't be measured in negatives
The table shows five items that a person may consider including in a safety contract.
Item number Item
1 Label all containers.
2 Tie long hair back.
3 Bring a cell phone to the lab in case of emergency.
4 Bring a small laptop computer to the lab to use MSDS online.
5 Wear safety goggles at all times.
Which three of the five items would be best to include in a safety contract?
1, 2, and 3
1, 2, and 5
2, 3, and 4
3, 4, and 5
Answer:
1,2, and 5
Explanation:
The items that should include in a safety contract are:
1 Label all containers.2 Tie long hair back.5 Wear safety goggles at all times.Who has to entire a technology safety settlement?One copy must be signed by means of both you and a determined mum or dad before you may participate inside the laboratory. the second reproduction is to be stored in your technology pocketbook as a regular reminder of the safety guidelines. 1. conduct yourself in an accountable man- ner at all times inside the laboratory.
Which is accurate lab protection?Avoid direct contact with any chemical. in no way odor, inhale, or flavor laboratory chemical compounds. always wash palms and fingers with soap and water after eliminating gloves and earlier than leaving the painting's place. never eat, drink, bite gum or tobacco, smoke, or apply cosmetics in the laboratory.
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HELPPPP
Which of the following statements is true?
Plasma can be found in lightning and comet tails.
Liquid molecules also have a strong attraction to one another.
Bose-Einstein condensates form at absolute zero.
All of the above.
Answer:
Plasma can be found in lightning and comet tails
Explanation:
hope i helped! [i got this correct in a test,hope you get it correct]
What is the enthalpy of reaction for the decomposition of calcium carbonate?
What type of chemical bond is present in the CI2 molecule?
simple question ill name u brainiest
Answer:
Test tube :)
Explanation:
Im pretty shure its D- graduated cylendar
A flask holds much more than that a test tube doesnt have mesure meants (i dont tink so at least?) and a beaker also much more and is harder to explain..
2. The three sub-atomic particles that make up the atom are
Answer:
Protons
Neutrons
Electrons
Explanation:
3. A copper sulfate hydrate is taken in a crucible and heated until completely dry.
Mass of the crucible: 26,30g
Mass of the crucible + hydrate compound: 27.35 g
Mass of the crucible + compound (after 1" heating): 27.03 g
Mass of the crucible + compound (after 2nd heating): 26,98 g
Mass of the crucible + compound (after 3d heating): 26.97 g
Answer the following questions based on the above data. Show work.
(1) What is the mass of the anhydrous (fully dry) Cu(SO4)2?
How many moles of anhydrous Cu(SO4)2 is this?
(ii)
What is the mass of water (liberated during drying)?
How many moles of water is this?
(111)
What is the simplest molar ratio between anhydrous Cu(SO4)2 and H2O?
(iv)
What is the formula for the hydrate of copper sulfate?
1310: Experiment 3 - Study of Hydrates
36
Answer:
i) mass of the anhydrous CuSO₄ = 0.67 g;
Number of moles of anhydrous CuSO₄ present = 0.004 moles
ii) mass of water liberated = 0.38 g;
Number of moles of water liberated = 0.02 moles
iii) simplest mole ratio = 0.02 / 0.004 = 5 : 1
iv) Formula of the hydrate of copper sulfate = CuSO₄.5H₂O
Explanation:
Molar mass of CuSO₄ = 159.6 g/mol
i) mass of the anhydrous CuSO₄ = (mass of crucible + compound after 3rd heating) - mass of crucible
= 26.97 g - 26.30 g = 0.67 g
Number of moles of anhydrous CuSO₄ present = mass/molar mass
= 0.67 g / 159.6 g/mol = 0.004 moles
ii) mass of water liberated = (Mass of the crucible + hydrate compound) - (mass of crucible + compound after 3rd heating)
mass of water liberated = 27.35 g - 26.97 g = 0.38 g
Number of moles of water liberated = mass/molar mas
Number of moles of water liberated = 0.38 g/ 18.0 g/mol = 0.02 moles
iii) simplest mole ratio = 0.02 / 0.004 = 5 : 1
iv) Formula of the hydrate of copper sulfate = CuSO₄.5H₂O
What is the shape of pure carbon fullerenes?
A. Hollow tube
B. Hollow Sphere
C. Flat layers
D. Hard, solid crystal
Answer:
The correct answer is Hollow Sphere.
Measuring Physical Properties Lab Report Instructions: In the Physical Properties lab, you will test the physical properties of different building materials in order to pick the appropriate materials for a new home in Tiny World. Record your observations and test measurements in the lab report below. You will submit your completed report. Name and Title: , instructor's name, Sep 9th, measuring physical properties lab report. Hypothesis: In this section, include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment. If we use Aluminum to build the roof of the house, then the temperature inside the house will remain cooler. If we use Clay brick to build the walls and floors of the house, then the temperature inside the house will remain cooler. If we use copper to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate. If we use Iron to construct the latches on the windows and doors, then the magnetism will keep the latches secure. Procedure: The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using the summary questions, clearly define the dependent and independent variables of the experiment. Independent V- The type of material tested. dependent V- The results of each test completed Objective(s): In your own words, what was the purpose of this lab? Conclusion: Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words. 1. Using two to three sentences, summarize what you investigated and observed in this lab. 2. What building material did you use to build your house? Did your results support or fail to support your hypotheses? 3. What were the densities of the materials you chose for the walls and floor for the home in Tiny World? Why do you think a building material's density is important when building homes or architectural structures? 4. Why wouldn’t you choose wood or aluminum for the latches on your house? 5. Which material has the highest thermal conductivity? Which material has the highest electrical conductivity? Explain why thermal and electrical conductivity is so high with this material. 6. Think about where you live now or where you have lived in the past; use complete sentences to describe this environment and the weather. What building materials do you believe would work well to build a home in that area? Explain why you chose these materials. P.S. Answer objections and conclusion.
Answer:
Explanation:
Data:
Record the results of each of your physical property tests in the table below.
Wood Clay Brick Iron Aluminum Copper Nickel
Flexibility
(?/10) 3/10 2/10 4/10 7/10 6/10 5/10
Magnetism
(number of paper clips) 0 1 10 0 0 7
Thermal Conductivity
(W/(m·K)) 0.12 0.6 80 235 400 91
Electrical Conductivity
(x107 S/m) 0 S/m 0 S/m (1 x107 S/m) (3.8 x107 S/m) (5.9 x107 S/m) ( 1.4x107 S/m)
Density
(g/cm3) 0.75 0.51 0.33 0.45 0.315 0.318
NEED HELP Please Will Choose Brainlest
Kinetic molecular theory is often used to describe conductors because as the ________ increase the thermal conductivity of the material increases.
atoms
collisions
weight
Answer:
B
Explanation:
Collisions
Answer:
Collisions
Explanation:
The questions talking about molecules so particles are moving around. Hope this helps
help I have to do this before the end of the day!
Answer:
What the
Explanation: fawk
6
Adding thermal energy to a cup of water can cause particles to do which of the following? *
(2 Points)
Select all that apply.
Move faster
Get farther apart
Move slower
Remain constant
Get closer together
Adding thermal energy to a cup of water can cause particles of water to move faster.
Substances are made up of particles which are in constant random motion colliding frequently with each other as well as with the walls of the container. This is a postulate of the kinetic theory of matter.
The temperature of a substance is defined as the average kinetic energy of the particles of that substance. As temperature increases, the kinetic energy of the particles increases because the average velocity of the particles of the substance increases.
Therefore, adding thermal energy to a cup of water can cause particles of water to move faster.
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The volume of a coke cup is 600 mL. What is it’s volume in cubic centimeters ?
Answer:
600 cm^3
Explanation:
The volume of a coke cup is 600 ml. So the volume in cubic centimeter is 600 cm^3
What is volume?Volume is defined as measure of 3 dimensional space occupied by a matter, substance or enclosed by a surface.
Volume is measured in cubic unit.
Cubic centimeter is commonly used as the SI unit of volume.
One cubic centimeter correspond to the volume is equal to one millimeter.
Cubic centimeter is used to measure the volume of small things.
As
1 cm^3 = 1 cm
1cm^3 = 1ml
So
600 cm^3 = 600 ml
Thus, volume of a coke cup is 600 ml. So the volume in cubic centimeter is 600 cm^3
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Which describes any substance that shatters or breaks easily?
malleable
brittle
volatile
ductile
Answer:
Brittle
Explanation:
Its the most easy thing to break.
The substance that breaks easily or shatters is brittle. As malleable and ductile are hard in nature and volatiles are types of solute. Thus, option B is correct.
What are brittle substances?These substances are hard and rigid but contain little tensile strength that is they can be broken down into pieces easily on applying a little amount of pressure.
They have little deformation and poor capacity for conduction of current with high compressive strength and low tensile strength.
On applying pressure they fracture with little elastic deformation and some examples of it are some alloys with low plasticity, glass, and graphite. Their breaking is also known as brittle breakage.
Ductile are stiff and unable to break and the volatiles are type of solute easily dissolve in water malleable and are unbreakable or difficult to break. These all are the bad conductor of electricity.
Therefore, brittle is the substance among these which breaks. Thus, option B is correct.
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how many kilograms are in a 50 pound luggage bag?
what determines the velocity of an object
Answer:
the direction of the object
Explanation:
A) A metal ruler has a
mass of 42g and a
volume of 10cm". What
is the density?
Answer:
4.2g/cm^3
Explanation:
Density is a measurement of the amount of mass of a substance can fit into a space. In order to find density you can always use the formula mass/volume (often abbreviated as m/v). In this case that would be 42/10 g/cm^3 or 4.2g/cm^3
A single measurement system that scientists all over the world have agreed on adopted in 1960 by the General Conference on Weights and Measures; has seven base units, and most other units are derived from these seven?
Answer:le système international d’unite(SI)
Explanation:
Help me plz asap
42,52,55,56,57
Answer:
42) 76
b)70
Explanation:
52) because you don't want to confuse different units. one ex)1cm is 1/ 100 of a meter
55) 1 km=1,000 meters
b) 10 decimterers = 1 meter
56)The SI standard for length is the meter the standard for volume is the cubic decimeter
ex) 1cm³=1mL
57) The two scales are the same. but there are no negative temperatures in Kelvin. 0 Kelvin is the lowest temperature possible.
0 Kelvin= -274.5 Celsius
Match the scientist with their scientific idea. Question 2 options: Gases are formed from tiny particles so small you can’t see them. The particles are spread out into a certain area and move when people walk through them. Matter was made of different kinds of things. Substances combine or break apart to create new, different substances. 1. Democritus 2. Bernoulli 3. Priestley
Answer:
gases is 2
particles are 3
and the 3rd question is 1
Explanation:
Bernoulli's principle states that gas is a tiny particle that is not visible to the eyes, but particles move when displaced by some factors. Thus, the correct matches are a. 2, b. 3, and c. 1.
What is Bernoulli's principle?Bernoulli's principle states the kinetic molecular theory of gases. According to the theory, gas particles are small and are far away from each other. But they move from their position due to the fluid dynamics when objects pass through them. Hence, option a. 2 is correct.
Democritus stated about the matter is made of various constituents particles. He is known as the "Father of science" as gave the idea of matter comprising atoms. Hence, option c. 1 is correct.
Joseph Priestley proposed about the new substance formed by breaking or creating the bonds between the reactants. According to him, gases are made of particles that can be a mixture. Hence, option b. 3 is correct.
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Fractional distillation is used to seperate mixture of water and ethanol. The temperature of the top of the fractioning column is lower than the temperature of the bottom. The more ..... liquid evaporates and moves further up the column. It eventually reaches the .... where the .... changes to a liquid
- Condenser
- Higher
- Crystallisation
- Solid
- Volatile
- Flask heavy
- Vapour
Answer:
condenser higher uuuu
Determine whether each statement is a description of a physical property or a chemical property. Please check the box that applies.
Copper conducts heat well.
physical
chemical
Alcohol has a sweet odor.
physical
chemica
Answer:
A.physical
A.physical
Explanation:
The measurable properties are said to be the physical property of the substance. The conductivity of heat and the sweet odor are physical properties. Thus, options 1. a and 2. a is correct.
What is physical property?Physical properties are the characteristics of the substance that can be measured and observed directly. There is only change in the phases of matter involved.
The alterations in the chemical compositions and reactivity are not characteristic of the physical properties. It does not occur or requires a chemical reaction.
The copper conducting heat and the sweet smell of alcohol are physical properties as conductivity and odor are the physical traits along with malleability, hardness, solubility, etc.
Therefore, the conductivity of copper and sweet smell are physical properties.
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How many Magnesium are in 10MgCI2
Answer:
10 Mg
Explanation:
We are given the compounds MgCl₂.
For every one mole of Magnesium Chloride, there are 1 atom of Mg and 2 atoms of Cl₂.
So if we have 10 moles of MgCl₂, we will have 10 Mg.
Is fog homogeneous or heterogeneous? And why?
Which best describes thermal energy?
A.It is the difference between internal energies of two or more substances.
B.It is the sum of internal energies of two or more substances.
C.It is the portion of internal energy that can be transferred from one substance to another.
D.It is the portion of potential energy that can be transferred from one substance to another.
Answer:
Here is ur answer mate
The sum of internal energies of two or more substance.Hope it helps u mate
what did chemists learn about the moon's surface by analyzing moon rocks
Answer:
i gotchu babes!Explanation:
They learned that oceans of lava once covered the moon's surface. ... Astronauts collected rock samples from Earth's moon.The elements composing a are combined in a definite proportion by mass .
Answer:
Law of Definite Proportions states that in a given type of chemical substance, the elements are always combined in the same proportions by mass. ... Oxygen makes up 88.8% of the mass of any sample of pure water, while hydrogen makes up the remaining 11.2% of the mass
Answer:
Law of Definite Proportions states that in a given type of chemical substance, the elements are always combined in the same proportions by mass. Oxygen makes up 88.8% of the mass of any sample of pure water, while hydrogen makes up the remaining 11.2% of the mass.
Elements in which two groups are considered highly reactive?
a.1 & 18(8A)
b.2 & 14 (4A)
c.3-12
d.1 & 17(7A)
Answer:
option d is correct
Explanation:
element of group 1A and 7A(halogens) are highly reactive
Which type of energy refers to the sum of potential and kinetic energies in the particles of a substance?
A.motion
B.stored
C.internal
D.heat
Thermal (heat) energy is ur answer mate
Hope it helps
Answer:
heat is your answer ;) <3
Explanation:
How does the Scientific Theory of Atoms help us undersand atoms?
Answer:
Atomic theory is the scientific theory that matter is composed of particles called atoms. ... According to this idea, if one were to take a lump of matter and cut it into ever smaller pieces, one would reach a point where the pieces could not be further cut into anything smaller.
Explanation: hope this helps
