Answer:
Mass of copper oxide: 10g
Mass of copper: 8.882g
Mass of oxygen: 1.118g
Cu O
8.882 1.118
Divide by [tex]A_{r}[/tex] 8.882÷63.5 1.118÷16
0.14 0.07
Divide by the lowest number 0.14/0.07 0.07/0.07
2 1
Check the ratio now, Cu has 2 atoms and O has 1 atom .
The formula is [tex]Cu_{2} O[/tex]
Which of the following best describes a person doing science?
o A.
Dominick uses a computer to do his math homework.
O B. Lindsay measures the sizes of the craters on the Moon.
O C.
Isabel invents a new kind of doorknob.
o
D. Murray randomly predicts the result of a coin toss.
Answer:
B. Lindsay measures the sizes of the craters on the moon
Answer:
I think it's D but it's my (viewpoint)
In which layer of Earth's interior is the inferred temperature
6,000°C?
Answer:
outer core
Explanation:
the outer core is estimeted to be 6,000 C
Draw the electric field lines between a proton and an electron. According to Coulomb's law, how would the electrical force between these particles change if the product of their electrical charge increased?
Explanation:
An electron has a negative charge and a proton is a positively charged particle. Electric field lines are used to express the direction of the electric field. For a positive charge, it is outwards while for a negative charge it is inwards. The attached figure shows the electric field lines between a proton and an electron. The field lines emerge from proton and terminate at electron.
The electrical force between charges is given by :
[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]
r is the distance between charges
The force is directly proportional to the product of charges. It means that if the product of electrical charge increased, it means that the electrical force will increase proportionally.
aluminium oxide has a very high melting point (2072 degrees C) while carbon dioxide has a very low boiling point (-57 degrees C). Explain this difference clearly.
Please help I don’t get what it’s asking!!!
Answer:
Well, Aluminum Oxide has a very high melting point. Carbon dioxide has a very low boiling point.
Explanation:
They are both talking about different things, melting and boiling. Aluminum Oxide's melting point is much higher then carbon dioxide's melting point. Hope this help, and good luck on your assignment (if one)
why must we include units with a measurement?
Answer:
Units are used to show if a certain calculation is on track.
Explanation:
For example, 5.1 inches is way shorter than 5.9 inches.
why plastic do not rust
Answer:
it can't rust simply because it doesn't contain any iron or any of it's alloys. In fact, not even all metals rust.
Explanation:
Velocity and speed are both measurements of how fast something is moving however velocity is different from speed because
A) velocity and speed are the same thing
B) velocity is usually faster than speed
C) The velocity of an object also tells us the direction something is moving
D) velocity is how fast something is changing its speed
Answer:
C
Explanation:
Velocity is a vector quantity I.e it has magnitude and direction
Speed on the other hand is a scalar quantity I.e it has only magnitude
How is particle motion related to thermal equilibrium?
Answer:
With billions of moving particles colliding into each other, an area of high energy will slowly transfer across the material until thermal equilibrium is reached (the temperature is the same across the material).
which three elements have the most similar chemical properties
Answer:
K, Rb and Cs
Explanation:
Answer:
krypton, bromine, and argon
Help fast. If 1500 joules of energy is used to heat 50g of water with a temperature of 20°C, then what will the final temperature be? (Water’s specific heat is 4.18 j/g°c)
Answer:
27°C
Explanation:
q = 1500 J
m = 50g
c = 4.18 J/g°C
q = m·c·ΔT
ΔT = [tex]\frac{1500J}{50g*4.18\frac{J}{gC} } = 7C[/tex]
ΔT = final temperature - initial temperature
Final temp = 20 + 7 = 27°C
which terms are used to identify pure substance
Answer:
Physical properties of a substance are characteristics that can be observed without altering the identity of the substance. Color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.
Explanation:
NEED ANSWER ASAP!! I would really aprecitate it! Please.
Explanation:
Positron..............bhag bhag aaya sheer
Answer:
i dont undersstand lol
Explanation:
Explanation:
bhag bhag aaya sheer
..........
Muscles, bones, skin, and
organs are all mainly made up of
(PICK
ONE) -> Fats Fiber Minerals | Protein.
Answer:
The answer is Protein.
Explain why mixtures can be separated by physical methods, such as sieving and distillation.
How many inches/second are in
1.73 meters/minute?
A. 68.1 in./s
B. 0.0288 in./s
C. 1.14 in./s
D. 2.64 in./s
Answer:
1.73 meters / minute = 1.14 inches / second
Explanation:
The number of inches present in 1.73 meters/minutes is equal to 1.14 inches/seconds.
What is conversion factor?Conversion factor is a quantity which is get multiplied or divided with an any other given quantity to convert the given quantity into any other quantity.
Given quantity = 1.73 m/min
We know that, 1 meter = 39.37 inches
1.73 m/min = 1.73 × 39.37 = 68.11 inches/min
Also we know that, 1 min = 60 min to convert the above quantity into sec we should divide that by 60 as:
68.11 inches/min = 68.11 / 60 = 1.135 inches/sec (1.14)
Hence the required quantity is 1.14 in./s.
To know more about conversion factor, visit the below link:
https://brainly.com/question/97386
emelie is working on a science project. her task is to answer the question does rogooti a hair cream sold on tv affect the speed of hair growth in length her family is willing to volunteer for the experiment
Answer:
This question is incomplete and unclear; the complete question including the missing part is:
Emelie is working on a science project. Her task is to answer the question:
"Does Rogooti (a hair cream sold on TV) affect the speed of hair growth
(in length)". Her family is willing to volunteer for the experiment. Identify the control group (CG) and the independent and dependent variables.
ANSWER:
Independent variable: Rogooti hair cream
Dependent variable: Speed of hair growth/length
Control group: Family members that do not use the Rogooti hair cream
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a measurable response. In this case, the ROGOOTI HAIR CREAM is the independent variable.
Dependent variable refers to the variable that is measured or the variable that responds to the change made to the independent variable. In this case, the dependent variable is SPEED AT WHICH HAIR GROWS (IN LENGTH).
Control group in an experiment is the group that does not receive the experimental treatment. In this case, the experimental treatment is the Rogooti hair cream, hence, the control group will be the VOLUNTEER FAMILY MEMBERS THAT DOES NOT RECEIVE THE ROGOOTI HAIR CREAM ON THEIR HAIR.
Where is chemistry used?
A. In all areas of life
B. Only in the food industry
C. Mostly in medicine
D. Mostly in manufacturing
Answer:
A
Explanation:
chemistry is used in all areas of life
Answer: A
Explanation:
just got it right
Which element below has atoms with only two valence electrons?
Potassium
Sulfur
Magnesium
Neon
An atom has 17 protons, 18 neutrons and 17 electrons. What is the charge of its electron cloud?
Answer:
Neutral. There are equal amounts of protons or positively charged parts and electrons or negatively charged parts. The neutrons have no net charge which means this atom of chlorine is neutral.
Explanation:
What is the difference between a physical and a chemical property? (please hurry)
Answer:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. ... A chemical property describes the ability of a substance to undergo a specific chemical change.
Explanation:
Why would you expect soap to taste bitter
Answer:
It is basic
Explanation:
Soaps are always basic, and basic compounds have a bitter taste.
wave has a frequency of 5hz and a wavelength of 25 m/s.
what is the speed of the wave
Answer:
125m/s
Explanation:
speed= wavelength×frequency
= 25×5
=125
The speed of the wave will be 125 m/s.
What is speed?The magnitude of an object's rate of change of position with time, or the magnitude of change of position for each unit of time, is its speed; it can be considered as a scalar quantity.
Speed = wavelength × frequency
Calculation of speed is shown below:
It is given that wavelength = 25 m/s, frequency = 5 hz.
Speed can be calculated by using the formula:
Speed = wavelength × frequency
speed = 25m/s × 5 hz
speed = 125 m/s
To know more about speed.
https://brainly.com/question/7359669.
#SPJ2
186000 written in scientific notation
Answer:
its 1.86 x 105
Explanation:
i learned it last year
Answer:
1.86 x 10^5
plz, mark brainliest
An element has a shiny metallic appearance and is both ductile and malleable. In which section of the diagram would the element most likely be found?
A.
1.
B.
2.
C.
3
D.
4
Answer:
Section 2 on the diagram (Option B)
Explanation:
These metals can be shiny, ductile, malleable, and are good conductors of heat and electricity.
Water, air, buildings, food, and everything visible and invisible have mass and takes up space. What is the word used to describe anything that has mass and takes up space?
Answer:
Matter
hope this helps
Answer:
matter
Explanation:
Did the test
what state of matter of a substance depends on how the particles in that substance
Answer:
Solids is the answer hope this helps
How many electrons are shared between one nitrogen
atom and one carbon atom
9.Magnetization of iron is a physical change.
A true
B false
Answer:
This is true.
Explanation:
Magnetization of iron is a physical change and not a chemical change as there is no change of state, no change of temperature, no smell and no evolution of gas.
Which of the following substances cannot be separated?
O homogeneous mixture
heterogeneous mixture
element
O compound
Answer: Elements.
Explanation: Homogeneous and heterogeneous is just if a mixture is uniform or not. Mixtures and always be separated. Compounds are elements that combined which can be broken down again. So I say the logical answer is an element since it's pure and cannot be broken down into other elements or more of it's self.