Answer:
1. Measuring the weight of an apple- scale.
2. Studying a distant object- telescope.
3. Studying a very small object- microscope.
4. Measuring the length of a book- ruler.
5. Measuring the temperature of a cup of tea- thermometer.
Explanation:
1. A scale or measuring scale is used to measure or take the weight of any object. It can be either an analog or digital scale as long as the measurements can be taken from it. So, measuring the weight of an apple can be done on a measuring scale.
2. A telescope is an instrument that is used in scientific, especially in space explorations, to study a distant object in the universe/ sky. It gives a clear image and enables a person to view things closer than they are. So, a telescope can be used to study distant objects.
3. A microscope is used to study very different small objects, such as microbes and other organisms. It enlarges the objects to be viewed and thus, enables them to be studied in detail.
4. A ruler may be used to measure the length of a book. It has indications or marks by which the lengths can be taken.
5. A thermometer is an instrument that is used to measure the temperature of anything, be it a person or even other things such as food and even a cup of tea.
Answer:
Match each tool on the left with its most likely use on the right by choosing the correct number.
4
ruler
1
scale
2
telescope
5
thermometer
3
microscope
Explanation:
How does the average reaction rate differ from an instantaneous reaction rate?
Answer:
The average rate is the change in concentration over a selected period of time. It depends on when you take the measurements. The instantaneous rate is the rate at a particular time.
Explanation:
Based on the chemical equation provided, use the drop-down menu to choose the coefficients that will balance the
chemical equation.
102
DH20
1)H₂ +
-
Answer:
2(H2) + 1(O2) = 2 (H2O) is the balanced equation
Answer:
(2)H2O
(2)H2
(1)O2
Explanation:
it's not 2 1 2
or
2 1 1
Which of the following types of soil has the greatest permeability?
A. Loam
B. Sandy
C. Clay
D. Silty
Answer:
Sandy soil
Explanation:
Sandy soil has the greatest permeability of all soil types. It has a high amount of pore space and grain size.
Permeability is the ability of fluids to pass between the grains of a substance, here soil. It is usually a function of the size of the pore spaces and the grain size.
Sandy soils are usually made up of particles with sand-sized shapes and dimension. They have bigger and finer grains with little to no cement. This allows for a high level of permeability with no impediment to flow.Clay soil has very fine grain and with very low permeability. Silty soils have fair enough permeability and the permeability of loam straddles between that of sand and clay.Permeability is very important for determining the quality of soils.
what is balance equation
Answer:
Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products.
The following data was collected: 5.5 m; 5.3 m; 5.4 m. The actual length is 5.4 m. What is the accuracy and precision for this set of measurements?
Answer:
The measurement is precise and accurate
Explanation:
The accuracy of a measurement of length is often indicated by how "precisely" the length measurement can be read depending on the type of measuring instrument used scale.
Looking at the measurement, we can see that the values lie between ±0.1 from the expected values hence it is accurate.
Also, the values differ from each other by ±0.1 hence it the measurements are precise.
Answer:
Accuracy:
5.5 = 98.15%
5.3 = 98.15%
5.4 = 100 %
Precision:
5.5 ± 0.14
5.3 ± 0.14
5.4 ± 0.14
Explanation:
Accuracy is determined using; 100% - % error
% error = absolute error/actual value * 100%
5.5 - 5.4/5.4 * 100% = 1.85%
accuracy = 100 % - 1.85 % = 98.15%
5.3 - 5.4/5.4 * 100 5 = 1.85%
accuracy = 100 % - 1.85 % = 98.15%
5.4 - 5.4/5.4 * 100 % = 0 %
accuracy = 100 % - 0% = 100%
Precision is determined by obtaining the standard deviation of the mean;
s = √{∑(|x - m|)²/(n - 1)}
where x is the value, m is mean of values , n is number of values
mean = (5.5 + 5.3 + 5.4) / 3 = 5.4
deviations from mean, (x - m) are as follows;
|5.5 - 5.4| = 0.1
|5.3 - 5.4| = 0.1
|5.4 - 5.4| = 0
∑(x - m)² = (0.1 + 0.1 + 0) ²= (0.2)² = 0.04
(n - 1) = 3 - 1 = 2
s = √(0.04/2)
s = ± 0.14
Therefore, the precision of each measurement is as follows;
5.5 ± 0.14
5.3 ± 0.14
5.4 ± 0.14
how is plastic made?
Answer:
Cellulose, Coal, Natural Gas, Salt, and Crude Oil
When a candle burns it produced 41,300 Joules per 1 gram. Use dimensional analysis to convert this to Calories per pound.
1 cal = 4.184 J
16 ounces = 1 pound
1 ounce = 23.5 grams
1 Calorie= 1000 calories
Answer:
4477381.7 calories/pound
Explanation:
It is given that,
When a candle burns it produced 41,300 Joules per 1 gram.
We need to convert it into calories per pound.
We know that,
1 cal = 4.184 J
⇒ 1 J = (1/4.184) cal
1 pound = 453.592 grams
⇒1 g = (1/453.592) pounds
Now,
[tex]41300\ \text{Joules per gram}=\dfrac{41300\ \text{Joules}}{\text{gram}}\\\\=41300\times \dfrac{\dfrac{1}{4.184}\ \text{calories}}{\dfrac{1}{453.592}\ \text{gram}}\\\\=4477381.7\ \text{calories/pound}[/tex]
Hence, 41,300 Joules/gram = 4477381.7 calories/pound.
Which is the jellylike substance within cells? plasma membrane DNA cytoplasm ribosomes
Answer:
Cytoplasm is the semi fluid gel like substance of a cell that is present within the cellular membranes and surrounds the nucleus.
Explanation:
Hope this helps :)
Answer:
cytoplasm is correct
Explanation:
i took the test
Choose all the answers that apply.
What are the habits of mind that a scientist must possess?
creativity
skepticism
artistic ability
reasoning
bias
Answer:
Creativity
Skepticism
Reasoning
Explanation:
Scientists must see a creative way to solve problems in the world. Scientists must also be skeptic about what is said, because if they were not, no one would disagree and the problems would never be solved. Reasoning is a must, as reasoning is involved in the scientific process and writing conclusions to their studies.
Hope this help!
Which element is a liquid at 1000.K
Answer:
silver?
Explanation:
A car traveling at a constant speed of 75 miles/hr for 7.5 hours will go how far?
a
10 miles
562.5 miles
b
O.c
Od
751.5 miles
199 miles
Answer:
The answer is 562.5 milesExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × time
From the question we have
distance = 75 × 7.5
We have the final answer as
562.5 milesHope this helps you
Is this a balanced chemical equation?
Which statement best describes the atoms of the gas neon?
They slide past each other.
They move freely in all directions.
They vibrate in place.
They are packed closely together.
Answer:
B. They move freely in all directions.
Explanation:
i got it right on my test on edge
Answer:
B. They move freely in all directions.
Explanation:
What is the melting point of the above substance?
Make a claim describing the relationship between Force and charge.
Answer:
According to Coulomb, the electric force for charges at rest has the following properties: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges
For each compound, write the cation and anion with the appropriate charge. Then write the chemical formula for each compound.
Example: sodium fluoride: Na+1, F-1 NaF
a. Magnesium oxide
b. Strontium iodide
c. Aluminum chloride
d. Calcium phosphide
Answer:
Magnesium oxideStrontium iodideAluminum chlorideCalcium phosphide5% and NanO2 Cax[tex]x^{2}[/tex]
A steel cylinder contains a glass jar of sodium metal surrounded by water. All together the cylinder and its contents weigh 1000g. The cylinder is dropped which breaks the glass and shortly after popping sound is heard. Since the steel container did not break, we can assume that... *
Answer:
A steel cylinder contains a glass jar of sodium metal surrounded by water. All together the cylinder and its contents weigh 1000g. The cylinder is dropped which breaks the glass and shortly after popping sound is heard. Since the steel container did not break, we can assume that... *
Explanation:
stays the same the mass and stuff dosnt change.
help its due soon i need to get this right to pass the class
Answer:
the answer I am pretty sure is A
Explanation:
Because the way that a generator works is moving electric current around a wire and using magnets to make more energy. please tell me if I am wrong.
Answer: A
Explanation: Because the way that a generator works is moving electric current around a wire and using magnets to make more energy.
Define the law (Principle) of Uniformitarianism
Answer:
known as the Doctrine of Uniformity or the Uniformitarian Principle, is the assumption that the same natural laws and processes that operate in our present-day scientific observations have always operated in the universe in the past and apply everywhere in the universe.
Explanation:
13. Identify the state(s) of matter described by each statement.
a. has a definite volume
b. has a definite shape
c. completely fills any container
d. flows
e. is made of particles held together in a rigid structure
f. is made of particles that are close together
Answer:
A: solid and liquid
B: solid
C: gas
D: liquid and gas
E: solid
F: solid
which phrase describes a gas?
Answer:
Gas is a state of matter where particles flow freely. It has no definite shape or volume.
Explanation:
Based on the three formulas shown, use one of them to solve for the purple yellow and red box and explain how you did it.
P = 11.133 atm (purple)
T = -236.733 °C(yellow)
n = 0.174 mol(red)
Further explanationSome of the laws regarding gas, can apply to ideal gas (volume expansion does not occur when the gas is heated),:
Boyle's law at constant T, P = 1 / V Charles's law, at constant P, V = T Avogadro's law, at constant P and T, V = nSo that the three laws can be combined into a single gas equation, the ideal gas equation
In general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
To choose the formula used, we refer to the data provided
Because the data provided are temperature, pressure, volume and moles, than we use the formula PV = nRT
Purple box
T= 10 +273.15 = 373.15 K
V=5.5 L
n=2 mol
[tex]\tt P=\dfrac{nRT}{V}\\\\P=\dfrac{2\times 0.08205\times 373.15}{5.5}\\\\P=11.133~atm[/tex]
Yellow boxV=8.3 L
P=1.8 atm
n=5 mol
[tex]\tt T=\dfrac{PV}{nR}\\\\T=\dfrac{1.8\times 8.3}{5\times 0.08205}\\\\T=36.42~K=-236.733^oC[/tex]
Red boxT = 12 + 273.15 = 285.15 K
V=3.4 L
P=1.2 atm
[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1.2\times 3.4}{0.08205\times 285.15}\\\\n=0.174~mol[/tex]
The Earth is always _______ as it revolves around the sun.
Fill in the blank
Get Brainliest if correct.
Answer
Rotating
Explanation:
The Earth is always being pulled towards the Sun by gravity.
The Earth is not moving fast enough to "escape" the Sun's gravity and leave the solar system, but it is going too fast to be pulled into the Sun. Therefore, it keeps going around and around( roating)- orbiting the Sun.
Answer:
Rotating around the sun
Can someone please help me with this
Answer:
b Mass +1 charge 0
Explanation: protons are neutral, so neutrons do not have charge
Patrick did an experiment to study the solubility of two substances. He poured 100 mL of water at 20 °C into each of two beakers labeled A and B. He put 60 g of Substance A in the beaker labeled A and 60 g of Substance B in the beaker labeled B. The solution in both beakers was stirred for 1 minute. The amount of substance left undissolved in the beakers was weighed. The experiment was repeated for different temperatures of water and the observations were recorded as shown.
Experimental Observations
Substance Mass of Undissolved Substance at Different Temperatures (gram)
20 ° 40 ° 60 ° 80 °
A 18 14 10 5
B 60 60 60 60
Part 1: Which, if any, substance is soluble in water?
Part 2: Explain how the data helped you determine solubility for both substances for temperatures 20 °C to 80 °C.
Answer:
1. SUBSTANCE A IS SOLUBLE IN WATER WHILE SUBSTANCE B IS INSOLUBLE IN WATER.
Looking at the information given in the question about the two substance, you will discover that 60 g of both substances were initially put in the beaker. While the mass of undissolved substance for substance A is variable, that of substance B remain constant at 60 g, this shows that the substance is not soluble in water.
2. Looking at the two substances given in the question, you will observe that for substance A, the degree of solubility in water decreases as the temperature of the water increases. For instance, at 20 degree Celsius, the mass of undissolved substance is 5 and as the temperature increases to 40, 60 and 80 degree Celsius, the mass of undissolved substances also increase to 10, 14 and 18 respectively. This shows that, the higher the temperature, the less of the substance will dissolve. For substance B, the mass of undissolved substance remain constant at all temperatures, which shows that the substance is insoluble in water. Thus, the data given helps to determine the solubility of the substance by giving the amount of substances that are insoluble at each temperature.
Explanation:
A student is participating in the school science fair. She wants to investigate household cleaners.
Which question can she best answer through scientific investigation?
A. Which household cleaner is most effective at removing stains?
B. Which household cleaner smells the best?
C. How often should a person use household cleaners?
D. Where should a person buy household cleaners?
Answer:
A
Explanation:
Gold atoms can be identified based on the number of which subatomic particles?
A.neutrons
B.electrons
C.nuclei
D.protons
Answer:
D.protons
Explanation:
Gold is a chemical element and it is the element 79 on the periodic table. Thus, it has an atomic number of 79. The chemical symbol for Gold is Au, it is chemically classified as a transition metal and as a solid at room temperature.
Generally, the chemical element Gold is known to be malleable, ductile and a good conductor of electricity and heat. Also, it is a non-toxic chemical element with a beautiful lustrous sheen.
Gold atoms can be identified based on the number of protons (79) because it represent its atomic number, which is what is used to differentiate an atom of an element from the atom of another chemical element.
I need help please answer
Where do the glucose molecules that our cells need come from?
Answer:
glucose molecules that our cells need from is plants
What is the correct electron configuration for the ion K+?
1s22s22p63s23p6
1s22s22p63s23p64s1
1s22s22p63s23p64s2
1s22s22p63s1
Answer:
1s22s22p63s23p6
Explanation:
The electronic configuration of K is 1s22s22p63s23p64s1.To form K+1 we remove electron. Thus the electrons configuration of K +1 is 1s22s22p63s23p6.
Hence answer is option A
If an atom has 56 protons and 58 neutrons, how many electrons
would this atom have?
Because the protons = the electrons so the atom will have 56 electrons.
This atom would have 56 electrons.
Atomic Structure:
In a neutral atom, the number of protons and number of electrons are same which is equal to the atomic number of an atom.The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.So, it is given that;
Number of protons=56
Number of neutrons=58
Thus, number of electrons=56 (since, the number of protons and number of electrons are same)
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