What’s the first thing you should always do before starting a lab

Answers

Answer 1

Review your instructions


Related Questions

Wood has a density of 0.531 g/cm3. What is the volume of 44 grams of wood?

Answers

Answer:

The answer is 82.86 cm³

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

From the question

mass of wood = 44 g

density = 0.531 g/cm³

It's volume is

[tex]volume = \frac{44}{0.531} \\ = 82.86252354...[/tex]

We have the final answer as

82.86 cm³

Hope this helps you

ANSWER ASAPP
What is a compound?

Answers

Answer:

a compound is a substance that contains atoms of two or more chemical elements held together by chemical bonds. any combination of two or more parts, aspects, etc. a word formed from two existing words or combining forms.

Explanation:

a substance that contains atoms of two or more chemical elements held together by chemical bonds. any combination of two or more parts, aspects, etc. a word formed from two existing words or combining forms.

Answer:

a thing that is composed of two or more separate elements/mixture !

i hope this helps !

Which is more dense, dish soap or corn syrup?

Answers

Answer:

Corn syrup has 1.33 and dish soap has 1.06 so its corn syrup

For the following situations, describe the contact and non contact forces that are involved.
A. A book sitting on a shelf
B. A soccer player kicking a ball; the ball soaring through the air and landing on the ground
C. A hiker in the woods reading her compass to determine which direction to go
D. A child on a sled; first, the child is sitting at the top of the hill, waiting his turn; then, the child pushes off and slides down the hill, eventually coming to a ston

Answers

Answer:

D

Explanation:

Bc I got it right

Answer:

For A: the contact I think would be the bookshelf holding it up the non-contact force would be gravity making it so the book would stay where it was put.

For B: the contact force would be the ball being kicked and the non-contact would be the gravity pulling it back to the ground.

For C: A hiker in the woods reading her compass to determine which direction to go The contact would be her holding the compass and moving around the non-contact would be the compass arrow turning every time she moves.

For D: The child on a sled for the contact force would be the person pushing the little kid down the hill the non-contact force would be the gravity that would be keeping the kid going down the hill and gravity stopping the kid at the bottom of the hill.

Explanation:

Have the same assignment and these are the answers I gave. Hope this helps someone!

What is the mass of an atom with 7 protons, and 7 neutrons?

Answers

Answer:

Explanation:

Nitrogen has an atomic number of 7 (Z=7) because it has 7 protons in its nucleus. Some nitrogen atoms have an atomic mass number of 15 (A=15). A is the number of neutrons plus protons in the nucleus. However, we already know that there are 7 protons.

plz mark as brainliest

A student wants to find out if drinking coffee will affect the amount of sleep she has everyday. She collected data of cups of coffee that she drank to how much hours of sleep she got everyday. What would you plot on the y-axis?


Hours of sleep


Independent variable


Manipulated variable


Cups of coffee drank

Answers

Answer:

hours of sleep

Explanation:

because she is trying to collect data to see how much she would sleep.keywords how much hours of sleep she got everyday answer what they are asking you the answer is simply

You plot hours of sleep on the Y-axis while the cups of coffee drink on the X-axis. Thus, the correct option for this question is A.

What is the significance of plotting graphs?

The significance of plotting graphs is to represent a relationship between different sets of variables with respect to one another. The purpose of a graph is to present data that is too complicated to be described in the text.

According to the context of this question, a student wants to determine the effect of drinking coffee on the hours of sleep. So, she is required to take the hours of sleep on the Y-axis.

Therefore, you plot hours of sleep on the Y-axis while the cups of coffee drink are on the X-axis. Thus, the correct option for this question is A.

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What is the volume of a 200 gram sample of gold if its density is known to be 20.5 g/mL?

Answers

Answer:

The answer is 9.76 mL

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

From the question

mass of gold = 200 g

density = 20.5 g/mL

It's volume is

[tex]volume = \frac{200}{20.5} \\ = 9.7560975609...[/tex]

We have the final answer as

9.76 mL

Hope this helps you

HURRY I WILL GIVE BRAINLIEST Which would be a common-sense practice in a lab environment? keeping quiet about accidents washing hands before the lab taking a water bottle to drink scratching one’s face during the lab

Answers

Answer:

washing your hands before the lab

Yea I would agree that washing your hands before the lab is the correct answer. Since you may have germs or chemicals from products on your hands and it may contaminate the experiment.

given: f(x) 3x-1. g(x) 2x^2-3
=(3x-1) + (2x^2-3)
= 3x-1 + 2x^2-3
=5x^2-4

can someone tell me if its correct, im not sure if i am ;-;​

Answers

Solution:

f(x) = 3x - 1 = 0

f(x) = x = 1/3

By putting the value of x in g(x), we get

g(x) = 2(1/3)^2 - 3

g(x) = 2(1/9) - 3

g(x) = 2/9 - 3

g(x) = -25/9

Answer:

g(x) = -25/9

Answer:

[tex]2x^{2} + 3x - 4[/tex]

Explanation:

(f + g)(x)=(3x-1)+(2x^2-3)

Simplify:

2x^2+3x−4

If identical rocket ships were lifting off from Earth and Neptune, which
rocket would need more force for lift off and why.

Answers

Answer:It would be earth but not by much

Because Neptune has more surface mass but it’s a gas giant so it cancels itself out and would be pretty close Hope I helped

Answer:

it will need the same force. because the distance from Neptune to earth is the same.

Explanation:

If I fill a tall glass with water and then transfer the water to a shorter glass, it appears there is more water. Is there more water?

Answers

No, there is not more water. It just appears this way because the new glass is smaller and the water takes up more room in it than it did in the larger glass.

Matt's cube, after 5 trial, had an average destiny of 7.40. g/cm what is it made of ?​

Answers

Explanation:

5 trial, had an average destiny of 7.40. g/cm

help? This is science btw​

Answers

the first choice. the greatest mass

What is an electrolyte in an electrochemical cell?

Answers

Answer:

An electrolytic cell uses electrical energy to drive a non-spontaneous redox reaction. An electrolytic cell is a kind of electrochemical cell. ... The electrolyte is usually a solution of water or other solvents in which ions are dissolved. Molten salts such as sodium chloride are also electrolytes.

Explanation:

Explanation:

An electrolytic cell has three component parts: an electrolyte and two electrodes (a cathode and an anode). The electrolyte is usually a solution of water or other solvents in which ions are dissolved. Molten salts such as sodium chloride are also electrolytes.

Refer to this portion of the periodic table to answer the question that follows.
3
4
Lithium Beryllium
Li Be
6.939 9.01218
2.1 2,2
5
Boron
B
10.81
2,3
7
Nitrogen
N
14.0067
2,6
8
Oxygen
0
15.9994
2,6
9
Fluorine
F
18.9984
2,7
12.011
2,4
20.183
2,8
Which element in this group would be the least likely to react with other elements?
a
Boron
b
ОООО
Lithium
Oxygen
Neon
d

Answers

Answer:

nitrogen

Explanation:

it has 14.0067 and it helps with the reaction of the other element

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the correct option is option D.

What is element?

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

Noble gases are the gases that belongs to group 18 of periodic tables. These gases have the noble gas configuration. These gases are the least reactive. On applying high pressure and temperature, these gases get reactive.

Among the given option Neon Ne is the only element that is belonging to the noble gases. Neon is unreactive.

Therefore, the correct option is option D. Neon is unreactive.

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The number of protons in an atom is also known as the atomic what?

Answers

carbon atoms have six protons, hydrogen atoms have one and oxygen atoms have eight. The number of protons in an atom is referred to as the atomic number of that element. The number of protons also determines the chemical behavior of the element.

why can't a beaker be used to measuring the volume of a liquid

Answers

Graduated cylinders are designed for accurate measurements of liquids with a much smaller error than beakers. They are thinner than a beaker, have many more graduation marks, and are designed to be within 0.5-1% error. ... Therefore, this more precise relative of the beaker is just as critical to almost every laboratory.

Answer:

It doesn't have measure marks on it.

11. Calculate the number of atoms of sodium in a 4.5-gram sample.
A 1.2 x 1023 atoms Na
B 2.5 x 1023 atoms Na
C 1.7 x 10-22 atoms Na
D 3.1 x 1024 atoms Na

Answers

Answer:

A

Explanation:

difference between halogens and group 0 elements

Answers

Answer:

Colourless. Although they have similar properties they are not identical. For example, as you descend Group 0 the density of the gas increases as does the mass of a single atom. ... All the halogens exist as molecules, bonding covalently to their own atoms - adding stability as they complete their full outer shells.

The difference between halogens and group 0 elements is that in their electronic configurations the halogens have 1 electron less than the stable octet while the zero group elements have stable octet.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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does water in a glass have mass

Answers

Answer:

A glass of water, or 200 grams of water, therefore contains 6.6855 × 1024 water molecules. The total mass of the hydrosphere is about 1.4 × 1024 grams, and thus the total hydrosphere contains about 7 × 1021 glasses of water (with 200 grams of water in each).

Explanation:

Answer:

Just like solids, liquids also have their own characteristic density. ... Just like a solid, the density of a liquid equals the mass of the liquid divided by its volume; D = m/v. The density of water is 1 gram per cubic centimeter. The density of a substance is the same regardless of the size of the sample.

Matter is generally defined as any thing that has mass and occupies spaces. Matter is generally divided into three categories ; solid, liquid and gas. Water is a liquid, water has does have molecules, thus has a mass, and is suspended in an area such as water in glass.

SO YES WATER IN A GLASS HAS MASS :)

Hope this helps ~OwO~

The charge is affected by (more than 1 may be correct)
a. protons
b.mass
c.electrons
d.neutrons

Answers

Answer:

protons and electrons

Explanation:

protons give off a positive charge and electrons give off a negative charge

water is 11.19% hydrogen and 88.1% oxygen by mass. Lake superior contains about 1.2x10 kg of water. what mass of hydrogen is contained in lake superior

Answers

Answer:

mass of hydrogen in lake = 11.19% of 12

                                          = 1.3428

check if question is correct or not

Explanation:

Water is 11.19% hydrogen and 88.1% oxygen by mass. Lake superior contains about 1.2x10 kg of water the mass of hydrogen is 1.32 kg

What is mass?

Mass is defined as a unit of measurement that describes the amount of matter that makeup an object.

It can also be defined as quantitative measures of inertia, fundamental properties of all matter. It is a dimensionless quantity.

As given 11.19% hydrogen is present in 1.2 x 10 kg

So, the mass of hydrogen = 11.198 % of 1.2 x 10 kg

                                           = 11.19 / 100 x 12

                                           = 1.32 kg

Thus, water is 11.19% hydrogen and 88.1% oxygen by mass. Lake superior contains about 1.2x10 kg of water the mass of hydrogen is 1.32 kg.

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What will most likely occur if sulfur forms an ionic bond with another element? (Click on the icon for the periodic table to view sulfur)

Sulfur will accept electrons.
Sulfur will donate electrons.
Sulfur will become a positive ion.
Sulfur will become less stable.

Answers

Answer:

The answer is Sulfur will accept electrons

Explanation:

Because it will most likely occur if sulfur forms an ionic bond with the elements

If sulfur forms an ionic bond with another element then the sulfur will accept electrons. Hence option A is correct.

What is ionic bond?

Due to their electrostatic attraction, oppositely charged species interact via ionic bonding, a form of chemical connection.

One atom transfers electrons to another when a positively charged ion forms a connection with a negatively charged ion.

Example: NA+ and Cl- gives NaCl

Sulfur belongs to group 6A of non-metals. Its valence electrons number six. It follows the octet rule. It must acquire two electrons. Thus, it creates two single covalent connections (ionic bonds).

When sulfur receives two electrons, it is ionized itself, so it from an ion with a 2-charge.

Sulfur will accept electrons will mostly likely occur if sulfur forms an ionic bond with another element. Hence option A is correct.

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Which of the following metals is most reactive?
a. Mg
b. Rb
c. Cs
d. Li

Answers

the answer would be c :)

describe how changing the particles changed the atom

Answers

bonds between atoms break and new ones form and energy is either given out or taken in

Changing the particles changes the atoms by converting it to a new substance through bond change.

During a chemical reaction changes occurs in the atoms of an element due to the formation or breaking of bonds.

There is either loss or gain or sharing of atoms between two elements reacting together.

Bonds between atoms break and new ones form and energy is either given out or taken in.

This type of reaction leads to the formation of new substances made up of a new combination of atoms and a different configuration of electrons.

Therefore, because various changes occurs during a chemical reaction, changing the particles changes the atoms by converting it to a new substance through bond change.

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Which of the following is a reaction between an acid and a base?
HCI + NaOH + H2O + NaCl

CaCl2 + K25 + CaS + 2KCI

NaCl + AgNO3 →→ NaNO3 + AgCl

C3H8 + 502 + 3CO2 + 4H2O

Answers

The first one

HCl is a strong acid and NaOH is a strong base which will react and make H2O and NaCl

What is a property in Science

•how much space an object takes up

•something that changes all the time

•a characteristic or a quality of an object or substance

• a spoon

Answers

Answer:

dhsjsbdjdnxjdjdbrbdnñxndndndndjdndndndbf it's b

А
B
с
578 g
343 9
722 g
which is more dense?

Answers

Answer:

can you rephrase the question it is hard to understand

If you were in Canada and purchased a 1 kg apple at the grocery,how many grams were in the apple?

Answers

Answer:

1000 gram

Explanation:

because mass is constant everywhere

A neutral hydrogen atom is a special case as it can accept, remove, OR share
electrons during reactions with other atoms. If the electron is removed from
hydrogen, the remaining positive proton number in the atom is 1 and remaining
negative electron number is?

Answers

Answer:

The remaining negative electron number is 0.

Explanation:

1 - 1 = 0 since hydrogen has exactly 1 electron. The charge must be balanced if it is a neutral atom. The 1 electron got peeled off and the remaining number is 0. That means the hydrogen atom is a proton now.

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