Answer:
2 significant figures.
Explanation:
Significant Figures Rules:
1. Anything that isn't a zero is a sig fig
2. If a decimal point comes after the ones digit, everything before the decimal is counted as sig fig (i.e 2000. would be 4 sig figs).
3. If we are dealing with small decimals, the zero before and after the decimal (i.e 0.002) is a placeholder and is not counted as sig figs.
4. Any zeros between 2 significant digits is considered in sig figs (i.e 2002 would be 4 sig figs)
Since we are dealing with 87000, we see that we have no decimal point. That means our only sig figs are 8 and 7, which equals 2 sig figs.
If you find the mass of a sample to be 42.1 g and the actual mass is 42.0 g. What wold be the percent error
Answer:
0.24%
Explanation:
The following data were obtained from the question:
Measured value = 42.1 g
Actual value = 42 g
Percentage error =?
Percentage error can be obtained by using the following formula:
Percentage error = |Measured value – Actual value | / Actual value × 100
With the above formula, we can obtain the percentage error as follow:
Measured value = 42.1 g
Actual value = 42 g
Percentage error =?
Percentage error = |42.1 – 42| / 42 × 100
Percentage error = 0.1/42 × 100
Percentage error = 10/42
Percentage error = 0.24%
Therefore, the percentage error is 0.24%
what is the mass of 975 mL of mercury? Its density is 13.5 g/mL
Answer:
72.22 g
Explanation:
975 mL Mercury× 13.5 g/mL = 72.22 g
Read the passage "Ants" in the box below.
ANTS
Carla and Maurice are observing ants in their backyard. Carla is drawing
pictures of the ants around the anthill and the objects they carry. The pictures will
decorate her bedroom wall. Maurice is recording the number of ants that enter the
anthill and what types of things they bring with them, so he can figure out what ants
eat
Which type of activity did the two perform?
O Both participated in scientific activities in which they objectively observed and recorded
information about ants to answer a question about nature.
Carla participated in a scientific activity, while Maurice participated in an artistic activity.
Carla participated in an artistic activity, while Maurice participated in a scientific activity.
O Both participated in artistic activities in which they subjectively observed and recorded
information about ants to illustrate a part of nature.
Answer:
C) Carla participated in an artistic activity, while Maurice participated in a scientific activity.
Explanation:
Scientific activities involve making observations, which ultimately leads to the series of steps that aims at solving the observed problem or answering a question that arises from the problem. This is the case of Maurice who is observing and recording information about ants in order to solve a curiosity (about what they feed on).
However, on the other hand, Carla is given a pictorial representation of the ants and what they carry. It is not based on curiosity or to answer a question about the ants but rather for decoration or aesthetic purposes, which is what makes her activity artistic.
how were you able to identify the periods?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, the period of the periodic table are the horizontal (left to right) rows in the periodic table. Elements in the same period have the same number of electron shells. There are seven periods in the periodic table.
The periodic table of elements is the table that contains all chemical elements arranged according to there atomic number. Atomic number is the number of protons present in the nucleus of an atom.
when calcium carbonate is heated two new substances calcium oxide and carbon dioxide are formed................write a word equation for the above chemical reaction
Answer:
CaCO3------->CaO + CO2
Heat
1)Describe pure sand and pure salt. Use a hand lens if available to get more detail. Type a description. a)sand b)salt 2)Investigate the dissolving properties of pure sand and pure salt. Which one will be caught in the filter paper if each substance was mixed with water and then filtered? Filter both separately if you are not sure. Devise a plan to get pure sand and pure salt in different piles from a 1 gram sample of the mixture. Include in your plan:
Answer:
See explanation
Explanation:
A salt is made up of homogeneous particles while sand is made up of heterogeneous particles. Salt is a crystalline substance while sand is a coarse substance.
If salt and sand are mixed with water, salt forms a solution with water, hence, salt cannot be caught on filter paper. However, sand does not form any chemical specie with water hence it is caught on the filter paper as a solid.
What is a better conductor of electricity? Copper Iron Nickel Aluminum
Why is the following molecule nonpolar and hydrophobic?
Answer: the answer is not the glycerol molecule in fats contains a carboxyl group
The given molecule is nonpolar and hydrophobic because there is an unequal distribution of hydrogen and oxygen atoms. Thus, the correct option for this question is D.
What is a Hydrophobic molecule?A Hydrophobic molecule may be defined as a type of molecule that is interestingly repelled from a mass of water. It is typically not soluble in water. These molecules are always repelled away from water contact.
When there is an equal distribution of hydrogen and oxygen atoms delivered, the constructed molecule is polar and hydrophilic in nature. This is because the partial positive charge on the hydrogen atom attracts the partial negative charge of oxygen and makes the molecule attracted to the water.
Therefore, there is an unequal distribution of hydrogen and oxygen atoms is a statement that is responsible for a molecule to be nonpolar and hydrophobic. Thus, the correct option for this question is D.
To learn more about Hydrophobic molecules, refer to the link:
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Put 5.1 x 10^-7 into standard notation.
Answer:
My answer to the question is 0.00000051
Answer:
0.00000051
Explanation:
You travel by express Greyhound bus from Indianapolis, IN to Tampa, FL; this is a distance of 1,070 miles. With no stops, the trip takes 16 hours. What is the average speed (nearest whole number)? a) 45 mi/h b) 55 mi/h c) 90 mi/h d) 67 mi/h
PLEASE HELP <3.
D, 67
Explanation:
1070 miles/16 hours = 66.875 miles per hour average traveling speed, which rounds up to 67.
How many nanograms are in 34g?
Chemistry Question
Answer:
There's 34,000,000,000 nanograms in 34g.
Explanation:
U can write it like 3.4e+10.
Hope I helped ya.
< Sarah >
what organisms have no seeds and no specialized tissues?
A atom has 20 electrons, 21 neutrons, and 20 protons. What is the atomic mass of the atom?
name= calcium
atomic mass= 40.078 atomic mass unit
no of protons= 20
no of electrons=20
Н - О - Н
I have to find the Molecular formula
When a glass or a watermelon is moved, the volume stays the same. When a liquid is poured into a glass, the volume and the shape change. When gas is used to fill a balloon and the balloon is popped, the volume stays the same. Help pls
Answer:
ITS A. (Give me brainliest!!)
When a glass or a watermelon is moved, the volume stays the same as they are in a fixed shape and the volume of a solid state. Option A correct.
What is the solid-state?A solid-state is a state of matter in which the molecules of matter are closely packed with each other with the maximum molecular force of attraction for a fixed shape.
Glass and watermelon are fixed in shape as they are made before and volume is also fixed and the molecules are fixed in definite shape and the volume cannot be changed.
Therefore, Option A correct. When a glass or a watermelon is moved, the volume stays the same as they are in a fixed shape and the volume of a solid state.
Learn more about the solid state, here:
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Name a plant in which leaf is modified into tendril
Answer:
yellow vetch
Explanation:
Jennifer is making pies to serve at the family picnic. If each pie serves 6 people, how many pies will be needed to serve 60 people at the picnic?
Answer:
10
Explanation:
10 pies because 60 divided by 6 is 10.
what is the molar mass (g/mol) of cyclohexanol
Explanation:
Molar mass of cyclohexanol : 100.158 g/mol
The branch of science concerning heat flow and energy conversions is called _____. a) chemistry b) thermodynamics c) conversion science d) atomic studies
Answer:
Explanation:
The answer isssssssss ddddddd
Answer:
b thermodynamics
Explanation:
When dealing with hazardous materials generated in the lab, the two most important guidelines are: (Choose two.)
Answer and Explanation:
All generated hazardous waste must be collected and disposed of properly (according to regulations)Experimental procedures to be used should be determined by the one which generates the least amount of hazardous wasteI hope this answer and explanation is easy to follow. Let me know if I can be of further assistance.
2. Name a tool that is good for measuring the volume of a liquid accurately.
3. Name a tool that is good for estimating the volume of a liquid.
4. What tool would you use to measure the dimensions of a bedroom?
Answer:
[See Below]
Explanation:
✦ A beaker of liquid would measure the volume of a liquid.
✦ A graduated cylinder is good for estimating the volume of a liquid.
✦ You'd most likely use a tape measure to measure the wall length and width.
~Hope this helps Mate. If you need anything feel free to message me.
describe any two methods of preparation of alcohol chemistry
Answer:
Reduction of carbonyl compounds.
Hydrolysis of Alkyl Halides.
important of thermometer
Answer:
to see if something or someone has either a low or high temperature
Explanation:
because you wanna know if some has a fever so you dont get the coronna virus
How much energy your body used, in joules if your health device indicates 982 Calories were burned during your workout? How many Calories in a meal containing 4.2 x 10 4 joules?
Answer:
4.11x10⁶Joules
10.04Cal
Explanation:
Calories and joules are units of energy used in several fields of science.
4184Joules are equal to 1 Cal.
In joules, 982 calories are:
982 Calories * (4184 J / 1 Cal) =
4.11x10⁶JoulesIn the same way, 4.2x10⁴ Joules are:
4.2x10⁴J * ( 1Cal / 4184J) =
10.04CalWhy did the Boeing 767 crew need to do a density calculation? What was wrong
with theircalculation?
Answer:
Their calculation was way too off to the actual one.
Explanation:
Answer:
They need a density calculation so they can get the right vaule. Their calculation was way off compare to the acutal vuale.
Explanation:
What is the elixir of life
Answer:
The elixir of life, also known as elixir of immortality and sometimes equated with the name philosopher's stone, is a potion that supposedly grants the drinker eternal life and/or eternal youth. This elixir was also said to cure all diseases.
PLZ HELPP Cynthia sees that most of the ice in her iced tea has melted. Assuming the water and the ice are at the same temperature, what happened to the particles in her ice? A.The particles have a much greater amount of kinetic energy than before. B.The particles have the same amount of kinetic energy but no longer vibrate in place. C.The particles have had their kinetic energy converted into thermal energy. D.The particles have a higher temperature than before and are moving more freely.
Answer:
The most correct option here is D
Explanation:
The difference between a solid (ice) and a liquid (water)/gas (steam) is that the particles in a solid is tightly packed (and do not move) as against the particles in liquid which moves quite freely or those in gases that move very freely.
When a solid (for example ice) is subjected to heat, it's particles receives the heat energy, hence have a higher temperature, and starts moving from its compact position which turns the solid into liquid. This was what happened to the ice in Cynthia's iced tea. The ice got/absorbed an increased temperature from the surrounding tea and it's particles began to move (more freely) thereby causing the ice to melt.
Answer:
D
Explanation:
A solution containing a mixture of lactic acid and lactate was found to have a pH of 4.26. Calculate the ratio of the lactate concentration to the lac
Given :
pH of solution of mixture of lactic acid and lactate is 4.26 .
To Find : [tex]log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4[/tex]
The ratio of the lactate concentration to the lactate .
Solution :
We know , pKa of lactic acid is :
pKa = 3.86 .
Now , the solution of lactic acid and lactate is a buffer solution .
So , pHof buffer acid is given by :
[tex]pH=pKa+log(\dfrac{[Salt]}{[Acid]})[/tex]
Putting all given values :
[tex]log( \dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]}) = 0.4[/tex]
Taking anti log both the sides , we get :
[tex]\dfrac{[ \text{Conc. of lactate}]}{[\text{Conc . of lactic acid }]} = 2.51[/tex]
Therefore , the ratio of the lactate concentration to the lactate is 2.51 .
Hence , this is the required solution .
How do the test variables (independent variables) and outcome variables (dependent variables) in an experiment compare? A. The outcome variable (dependent variable) controls the test variable (independent variable). B. The test variable (independent variable) controls the outcome variable (dependent variable). C. The test variable (independent variable) and outcome variable (dependent variable) have no affect on each other. D. The test variables (independent variables) and outcome variables (dependent variables) are the same things.
Answer:
Study Island:
The answer is...
C. The test variable (independent variable) and outcome variable (dependent variable) have no affect on each other.
Explanation:
The test variable (independent variable) and the outcome variable (dependent variable) have no effect on each other. Hence, option C is correct.
What is an independent variable?The independent variable can be altered, manipulated and changed in an experimental study.
Researchers often measure independent and dependent variables in studies to test cause-and-effect relationships.
The independent variable is the reason or cause. Its value is independent of other variables.
The dependent variable is the outcome whose values depend on changes in the independent variable.
Hence, option C is correct.
Learn more about the independent variable here:
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Find the density in g/cm^3 of chalk, if 6.356 g occupy 2.56 cm^3
Answer:
Density = 2.48 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
mass = 6.356 g
volume = 2.56 cm³
Substitute the values into the above formula and solve.
That's
[tex]Density = \frac{6.356}{2.56} \\ = 2.4828125[/tex]
We have the final answer as
Density = 2.48 g/cm³
Hope this helps you