Help ASAP I’ll mark you as brainlister

Answers

Answer 1

Answer:

2.51g Mg

Explanation:

The empty crucible had a mass of 35.84. With the magnesium added, it had a mass of 38.45. This means that you should subtract the mass of the empty crucible from the mass of the crucible with Mg to find how much was added.

38.35g - 35.84g = 25.1g

Related Questions

label the parts of the wave

Answers

first one would be amplitude second one up would be crest third one down would be the trough last one left is the wave length

object with a mass of 30 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required

Answers

this answer is 2kg good luck

How can an unbalanced force affect an object?
O Unbalanced forces keep an object at rest.
Unbalanced forces cause objects to accelerate.
O Unbalanced forces cannot affect on object.

Answers

Unbalanced forces cause objects to accelerate. This is respecting Newton’s 1st law of motion.

Which property of sulphuric acid makes it suitable to use as a catalyst for the preparation of esters?

Answers

In Fisher esterification, sulfuric acid is used as a catalyst and its function is to convert the carboxylic compound in its conjugate acid. This favours the nucleophilic attack of the alcohol. To act as a catalyst you need a strong acid, therefore sulphuric acid is suitable for this kind of reaction.

is Tungsten carbide an elementary substance
or compound?

Answers

Answer:

Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms.

Answer:compound

Explanation:

One step in the production of copper is to heat copper (I) sulfide, Cu2S, with oxygen. This
produces copper (I) oxide and sulfur dioxide gas according to the following reaction:

2Cu2S(s)
+ 3O2(g)
→ 2Cu2O(s)

+ 2SO2(g)

What is the greatest mass of SO2 that can be produced from 15.0 mol Cu2S?

Answers

Answer:

9.61 x 10^2 g SO2

Explanation:

Ur welcome

The phenomenon that allows water to travel against gravity through thin openings (for
example, to the top of trees) is called:

Answers

Answer:

El motor que las permite vencer la gravedad es la evaporación del agua que tiene lugar en las hojas.

Explanation:

Help plz 10 pointsss———-

Answers

first would be homeostasis, second is a wolf panting after chasing

Answer:

the first question is homeostasis. and the second question is the wolf panting

Explanation:

let me know if u need an explanation n ill try to give one :)

which situation best represents convection

Answers

Answer:

A hot air balloon taking off

Explanation:

Except for the noble gases, most non-metals become anions.

True
False

Answers

It’sssss trueeee!!!!

What is energy measured in

Answers

Answer:

The unit of energy you measure in is joule.

Help please if link will report

Answers

All i know is the first one is electromagnet, the second one is attraction, the third is magnetism, the fourth is magnetize, the fifth is repulsion, the sixth is lines of force, the seventh is magnetic pole, the eighth is electromagnetism, the ninth is magnetic field, and the tenth is permanent magnet

What is needed for our cells to get energy from our food?

Answers

Answer:

cellular respiration is needed for our cells to get energy from our food.

Explanation:

Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.

Biomes are characterized by temperature, precipitation, and the plant and animal communities that live there.
True or false?

Answers

Biomes are typically characterized based on the dominant plant and animal species found in a certain geographic area. Temperature and precipitation are what determine the geographic distribution of a biome which species can live there.

False

A 20.0 mL of 0.27 M solution of the salt NaA has a pH of 8.70.

a) Calculate the pk, value of the acid HA.

(Correct to 3 sig. fig)

b) Calculate the pH of a solution containing 0.3 M HA and 0.1 M NaA.

(Correct to 3 sig. fig)

Answers

Answer:

a) 3.969

b) 3.489

Explanation:

a) Calculate the pk, value of the acid HA

PH of salt hydrolysis

P[tex]^{H}[/tex] = 1/2 ( pkw + pka + logC )

8.7 * 2 = 14 + log ( 0.27 ) + Pka

∴ Pka = 3.9686 ≈ 3.969

b) Calculate the PH of a solution containing 0.3 M HA and 0.1 M NaA

PH = Pka + log ( salt / acid )

= 3.9686 + log ( 0.1 / 0.3 )

= 3.9686 - 0.48 = 3.489

Question 7 (1 point
What is the general pattern seen in the periodic table that helps a person quickly identify if an element is a nonmetal? (Where are nonmetals
generally found on the periodic table?)

Answers

Answer:

the elements to the right including hydrogen

Explanation:

as you know non-metal tend to gain eletrons

basically group 5, 6, and 7 are nonmetals

group 1, 2, and 3 are metals and group 4 are transitional metals so be careful with group 4

Well, the simple is that metals will be located on the left side of the periodic table and non metals will be located on the right side. But, what you can do is whatever elements is located on the LEFT side of the STAIRCASE (where the metalloids are) are considered METALS and the elements to the RIGHT of the staircase are NONMETALS and the elements that are touching the staircase are metalloids. Also Hydrogen is a NONMETAL, yes it’s located to the left BUT it’s a no metals because it has the properties/requirements of a nonmetal. Another element I’ll like to mention is Aluminum. Aluminum is touching the staircase BUT it is not a metalloid. It is a metal.

PLEASE HELP ME!!!

A 38.8g piece of metal alloy absorbs 181J as its temperature increases from 25.0°C to 36.0°C°. What is the alloy's specific heat? Show your work.

Answers

Answer:

0.424 J/g °C

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of Equality

Chemistry

Thermochemistry

Specific Heat Formula: q = mcΔT

q is heat (in Joules)m is mass (in grams)c is specific heat (in J/g °C)ΔT is change in temperatureExplanation:

Step 1: Define

[Given] m = 38.8 g

[Given] q = 181 J

[Given] ΔT = 36.0 °C - 25.0 °C = 11.0 °C

[Solve] c

Step 2: Solve for Specific Heat

Substitute in variables [Specific Heat Formula]: 181 J = (38.8 g)c(11.0 °C)Multiply: 181 J = (426.8 g °C)c[Division Property of Equality] Isolate c: 0.424086 J/g °C = cRewrite: c = 0.424086 J/g °C

Step 3: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.424086 J/g °C ≈ 0.424 J/g °C

The United States has landed a device on Mars.

Answers

Answer:

They landed a Rover!

Explanation:

Isn't that Awesome!?!

is the distilled water/acidic/basic/netural?

Answers

Distilled water is neutral, because the H+ and OH- ions are balanced. Litmus is a natural acid-base indicator extracted from a type of lichen.

Distilled Water Has A Neutral pH, Which Means It Is Neither Acidic Nor Basic. Therefore, It's Neutral.

Is specific heat capacity always equal to heat capacity?

Answers

Answer:

No specific heat capacity and heat capacity are not equal

helllllppppppp pleaseeeeeee

Answers

Just look it up :) hope this helps

name two examples which are not considered as matter

Answers

Answer:

Light and Sound can be considered as non-matter.

Explanation:

Various forms of Energy like Heat, Sound, Light can be considered as non-matter

A sample of hydrogen changes its pressure from 756 torr to 499 torr while the temperature remains constant. After the pressure is reduced, the volume of the gas is 789 mL. What was the original volume?

Answers

P1 = 756 torr

P2 = 499 torr

V2 = 789 mL

V1 = ?

applying Boyle's Law

P1 * V1 = P2 * V2

756 torr * V1 = 499 torr * 789 mL

V1 = 499 torr * 789 mL / 756 torr

V1 = 520.78 mL

. Chalk is made of CaCO 3 . How many molecules are in 5 grams of chalk?

Answers

Answer:

20.02 grams of chalk.

Explanation:

Looking at page 14 of the earth science tables, how does the temperature change as a balloon rises through the Troposphere Stratosphere and Mesosphere?

Increase, decreases, increases again

Decreases, increases, decreases again

Increases

Decreases

Answers

Answer:

Decreases

Explanation:

The temperature decreases when latitude increases.

help, please ( rando words )

Answers

Answer:

ionic

Explanation:

Answer:

the answer is ionic

Explanation:

hope this helps!

please can i also have brainliest too?

Two tons of water is pumped into a tank 15 ft. High in 5 minutes. Determine the power output of the pump. (Note: One ton is equal to 2,000 lb. And remember to convert the minutes to seconds.)

Answers

Answer:

200 lb•ft/s

Explanation:

From the question given above, the following data were obtained:

Force (F) = 2 tons

Time (t) = 5 mins

Height (h) = 15 ft

Power (P) =?

Next, we shall convert 2 tons to pound. This can be obtained as follow:

1 ton = 2000 lb

Therefore,

2 tons = 2 × 2000

2 tons = 4000 lb

Next, we shall convert 5 mins to seconds. This can be obtained as follow:

1 min = 60 s

Therefore,

5 mins = 5 × 60

5 mins = 300 s

Finally, we shall determine the power of the pump. This can be obtained as follow:

Force (F) = 4000 lb

Time (t) = 300 s

Height (h) = 15 ft

Power (P) =?

P = F × h / t

P = 4000 × 15 / 300

P = 60000 / 300

P = 200 lb•ft/s

Thus, the power of the pump is 200 lb•ft/s

Answer:

It's 200 ft-lb/sec

Explanation:

I did it before!

Bronsted Lowry reactions can use hydroxide ions.
True
False

Answers

Answer:

Explanation:

3. The mass percent of nitrogen in NH4Cl is *
O 16.7% nitrogen
0 25.0% nitrogen
0 26.2% nitrogen
O none of these

Answers

Answer:

None of these

Explanation:

The mass percent is 35.4% (3 s.f.)

14/4+35.5 = 14/39.5 x 100 = 35.4 (3 s.f.)

3 points
5. Which of the following is true regarding the atoms involved in a
chemical reaction? *
a) During a chemical reaction, atoms will always be combined into much larger
molecules.
b) Some of the atoms will always be changed into a different type of atom by a
chemical reaction.
c) Some of the atoms present before the reaction will always be lost during a
chemical reaction.
d) The same number of each type of atom will always be present before and after a
chemical reaction takes place.

Answers

d) The same number of each type of atom will always be present before and after a chemical reaction takes place.

Mass is never created or lost in a chemical reaction, so the atoms of each element must stay balanced.

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