What is the density of an object with a mass of 150.0 g and a volume of 20.0 mL
Answer:
7.5g/mL
Explanation:
Density = Mass/Volume
= 150.0g/20.0mL
= 7.5g/mL
There is a different Safety Data Sheet for every chemical.
Select one:
O True
o False
Answer:
True
Explanation:
This is true because every chemical reacts differently
Which of the following is an example of how chemicals can both hurt and
help the environment?
A. Chemicals in a volcano's lava can harm plants, and some
chemicals can be used to determine what is in lava.
B. Chemicals are used to protect skin from the sun and also to help
skin tan.
C. Chemicals can pollute water, but they can also be used to clean
water.
D. Chemicals are used in artists' paints and also are used to clean
artists' paintbrushes.
Answer: C
Explanation: Because I just did the test lol.
Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.
What are the effects of chemicals?Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.
Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.
On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.
Therefore, option C. chemicals can both clean and pollute water.
Learn more about chemicals, here:
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Which of the following conversion factors would be most useful in converting miles per gallon to kilometers per
liter?
1 gallon/4 quarts
1 liter/1000 ml
O 1 mile/0.62 km
O 1,000 m/1 km
What proof did you see in the experiment that a chemical reaction took place?
Answer:
Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change
what were the limitation of debereiner's law of traid
Does sugar when dissolved form ions
Explanation:
Sugar will readily dissolve in water but doesn't form cations and anions in solution. That is, there are no charge carriers formed. Substances that only partially ionize into ions when dissolved in water are called weak electrolytes.
I hope it help:)
Answer:
Dissolving sugar is a physical change. It is not a chemical change. So, ions will not be formed.
A sample of water has a volume of 24.0 milliliters and a density of 0.992 g/mL. What is its mass? 1) 23.8 g 2) 24.2 g 3) NONE
Answer:
23.8
Explanation:
The formula for density is D=M/V, where D stands for density, M stands for mass, and V stands for volume. In this case, we are solving for mass, so we have to cross multiply the equation to isolate the variable of M. Once we cross multiply, we get the equation M=DV, and then we start to substitute the values into the equation. M=(.992g/mL)(24.0mL) is the equation, and once we multiply, we get 23.808 as the answer. But when figuring out density, mass, or volume, we need to utilize sig figs. Since the two numbers that you are multiplying both have 3 sig figs, the answer must have three sig figs. Round up or down based on the place value that you are rounding to. Since we are trying to get an answer that is in the tenths place, we round down to 23.8, which is the answer.
The more mass you have of a substance:
A. the greater its thermal energy
B. the slower the motion of its particles
C. the smaller its thermal energy
D. the faster the motion of its particles
A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?
Answer:
I think the answer could be 13 i hope this helps
1. What is the state of matter of each of these materials at room temperature? a) gold b) gasoline c) oxygen d) olive oil e) mercury (found in thermometers) f) aluminum
Answer:
a) gold - Solid
b) gasoline - liquid
c) oxygen - gaseous
d) olive oil - liquid
e) mercury (found in thermometers) - liquid
f) aluminum - solid
Explanation:
Matter exists in three states viz: solid, gas and liquid. Note that, room temperature is a neither hot or cold temperature, which is about 20-23°C.
A) Gold is a transition metal with the symbol Au. At a room temperature, Gold, like most metals are found as SOLIDS.
B) Gasoline is a liquid mixture of refined hydrocarbons majorly used as fuels.
C) Oxygen is a chemical element with symbol O. It is a constituent of natural air, which is a mixture of different gases including oxygen. Hence, at room temperature, Oxygen is a gas.
D) Olive oil is a vegetable oil got from olives. It is composed of fats and it's a liquid at room temperature.
E) Mercury is an element with symbol Hg. It is the only metallic element found naturally (at room temperature) as a liquid. It is used in thermometers.
F) Aluminum is another chemical element with symbol Al. It is a lustrous metal that occurs as a Solid in room temperature.
Which tool gives scientists information about the wind speed and humidity of a region?
Answer:
Anemometer. An anemometer is a type of weather instrument that measures wind speed.
A rock is placed in 10-mL of water causing the water level to rise
to 25-mL. The same rock has a mass of 7 grams. What is the density
of the rock?
Answer:
d ≈ 0.47
Explanation:
Density is represented by the ratio of mass to volume. We are given the mass (7 grams), but we need the volume.
The volume can be calculated by subtracting the new volume from the old volume.
25 mL - 10 mL = 15 mL
The volume is 15 mL and the mass is 7 grams. Now, set up the ratio. Remember, d = m/v.
d = 7/15
d ≈ 0.47
How many significant figures are in the answer when you multiply 67.20 x 8.02?
How many significant figures are in the answer when you divide 486.02 by 0.056?
How many significant figures are in the answer when you add 11.264 + 245.3?
Answer: 6, 7 and 6 significant figures, respectively.
Explanation:
A. 67.20 x 8.02 = 538.944, has 6 significant figures .
B. 486.02 x 0.056 = 27.21712, has 7 significant figures .
C. 11.264 + 245.3 = 256.564 = 6 significant figures.
Are changes in the state of matter (phase) considered physical or chemical changes? Why?
Answer:
Physical changes
Explanation:
Changes in the state of matter are physical changes.
First, the material is made up of the same components that is was before it changed states.
The physical properties of the material changed, but its chemical composition did not, meaning that is is a physical change.
Answer:
Physical change
Explanation:
Matter can change between phases, so they are reversible physical changes that do not change matter’s chemical composition.
Changes of state are physical changes in matter. They are reversible changes that do not change matter’s chemical makeup or chemical properties. Water, for example, can be a solid (ice), a liquid (drinking water), or a gas (steam). Those are physical changes that don't change the fact that water is always chemically made up of H2O (two hydrogens and one oxygen).
What is physical and chemical changes in your own word?
Answer:
physical is the change that doesn't effect the identity of the object chemical changes the identity of the object.
A young child is sent to the store with exactly $3.00 to buy donuts. If the donuts on a special sale cost $0.95 per dozen, how many donuts can be bought? Assume the baker will sell individual donuts. PLEASE ANSWER AS SOON AS POSSIBLE
Answer..............nvm
Explanation:
Which of the following aspects of kinetic-molecular theory explain why a plasma-based light doesn’t get unbearably hot? Select all that apply.
Particles exchange energy through elastic collisions.
All particles are in constant random motion.
Particles are small.
Except during collisions, interactions between particles are negligible.
The temperature depends only on the average kinetic energy of the particles.
Answer:
Particles exchange energy through elastic collisions.
All particles are in constant random motion.
Except during collisions, interactions between particles are negligible.
Temperature depends only on the average kinetic energy of the particles.
Explanation:
Answer:
A,B,D,E egd
Explanation:
4. Express the number 9.95 x 10-3 in common decimal form.
A) 0.00995
B) 9.95
C) 9950
D) 0.0995
E) 0.000995
Answer:A
Explanation:
Move the decimal forward 3 times.
3. Express the number 0.0880 in scientific notation.
A) 880 x 10-4
B) 8.80 x 102
C) 8.8 x 10-2
D) 8.80 x 10-2
0.880 x 10-1
Answer:D
Explanation:
Move the decimal forward 2 times.
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: sand, air, tomato juice, iodine crystals.
Explanation:
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Mixtures concept. You can view video lessons to learn Mixtures. Or if you need more Mixtures practice, you can also practice Mixtures practice problems.
What is the difficulty of this problem?
Our tutors rated the difficulty ofClassify each of the following as a pure substance or a mixt...as low difficulty.
How long does this problem take to solve?
Our expert Chemistry tutor, Dasha took 4 minutes and 29 seconds to solve this problem. You can follow their steps in the video explanation above.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Gulde's class at UB.
Why Aluminium oxide has higher melting point than Alumunium Chloride?
Answer:
They have high melting points . They have ionic
giant lattice structures : strong force of attraction between inland so have high melting points . They are iconic because of large electronegativity differences between the metal and oxygen ....Aluminum oxide (Al203) is ionic but does show some covalent character.
What is the density of an unknown object that has a mass of 5.0 g and volume of 20
ml?
Answer:
Density=mass / volume.
Density = 5/20.
0.25g/cm^3.
The density of the unknown object is 0.25 mL
Density of an object is defined as the mass of the object per unit volume of the object. Mathematically, it can be expressed as:
[tex]Density = \frac{mass}{volume} \\ \\ [/tex]
With the above formula, we can obtain the density of the unknown object as follow:Mass = 5 g
Volume = 20 mL
Density =?[tex]Density = \frac{mass}{volume} \\ \\ Density = \frac{5}{20} \\ \\ Density = 0.25 \: ml[/tex]
Therefore the density of the unknown object is 0.25 mL
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A 25.0 mL sample of sulfuric acid is titrated with 30.0 mL of 0.150 M sodium hydroxide. Calculate the concentration of the sulfuric acid.
Answer: The concentration of the sulfuric acid is 0.09 M
Explanation:
Molarity is defined as the number of moles of solute dissolved per liter of the solution.
According to neutralization law,
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1[/tex] = basicity of sulphuric acid [tex](H_2SO_4)[/tex] = 2
[tex]M_1[/tex] = Molarity of sulphuric acid [tex](H_2SO_4)[/tex]solution = ?
[tex]V_1[/tex] = volume of sulphuric acid [tex](H_2SO_4)[/tex]solution = 25.0 ml
[tex]n_2[/tex] = acidity of sodium hydroxide [tex](NaOH)[/tex] = 1
[tex]M_2[/tex] = Molarity of sodium hydroxide [tex](NaOH)[/tex] = 0.150 M
[tex]V_2[/tex] = volume of sodium hydroxide [tex](NaOH)[/tex] = 30.0 ml
[tex]2\times M_1\times 25.0=1\times 0.150\times 30.0[/tex]
[tex]M_1=0.09M[/tex]
Thus the concentration of the sulfuric acid is 0.09 M
recall the definition of an acid that you learned in chemistry. Explain how the reaction blow illustrates the acididc properties of laactic acid.
Answer:
Lactic acid is used to prepare medicine. It is colorless, can be solid or liquid form.
Explanation:
Acids are sour in taste. It changes the color and taste of the chemical. It reacts with some chemicals metals and produce the hydrogen. It react with hydrogen. I also react with the bases and produce the salt. It also promotes some of the chemical reaction. For example nitric acid, phosphoric acid sulfuric acid and the organic acids.
The lactic acid is soluble with ethanol and water. It is produced by the reaction of two strategies, the synthetic method and biotechnological methods. It is produced at very large scale by the help of fermentation. Lactic acid is colorless, in liquid or solid form. It is a weak acid and can react in the way as the stronger acids react.
Why do you think people have stopped believing in and trusting science?
Aluminum sells for $0.35 per meter. How much does a piece of aluminum 5.12 kilometers long cost?
leo is comparing carbon 12 and carbon 14 atoms which particles make these isotopes have different mass numbers
Carbon-12 (or 12C) contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 amu (six protons and six neutrons). Carbon-14 (or 14C) contains six protons, eight neutrons, and six electrons; its atomic mass is 14 amu (six protons and eight neutrons).
Hope this helped :)
Question 1 2.3 kJ is how many J?
Answer:
2300J
Explanation:
1 kilojoule is 1000joules so to get how much is 2.3 multiply it with 1000
How many km are equal to 1.55 x 10^4 m?
Answer:
15.5 km
Explanation:
1.55x10^4m
1.55x10000m
15500m
1km=1000m
b=15500m
1km*15500m=b*1000m
1km*15500m/1000m=b*1000m/1000m
b=15.5km
Hope this helps ;) ❤❤❤