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zlopas [31]
3 years ago
14

I need to know the independent variable and the dependent variable and control variable

Chemistry
1 answer:
Simora [160]3 years ago
4 0

Independent Variable: a variable that you can change in an experiment

Dependent Variable: something that changes as you change the independent variable

control variable: something that is not changed throughout the experiment

You might be interested in
The combustion of ethyne, shown below unbalance, produces heat which can be used to weld metals:
Andreyy89

Answer:

3.69 g

Explanation:

Given that:

The mass m = 325 g

The change in temperature ΔT = ( 1540 - 165)° C

= 1375 ° C

Heat capacity c_p = 0.490 J/g°C

The amount of heat required:

q = mcΔT

q =  325 × 0.490 × 1375

q = 218968.75 J

q = 218.97 kJ

The equation for the reaction is expressed as:

C_2H_{2(g)} + 5O_{2(g)} \to 2CO_{2(g)} + H_2O_{(g)}   \ \   \ \ \  \Delta H^o_{reaction} = -1544 \ kJ

Then,

1 mole of the ethyne is equal to 26 g of ethyne required for 1544 kJ heat.

Thus, for 218.97 kJ, the amount of ethyne gas required will be:

= \dfrac{26 \ g}{1544 \ kJ} \times 218.97 \ kJ

= 3.69 g

3 0
3 years ago
If an unknown substance CANNOT be broken down into simpler substances, it is
lisov135 [29]

The correct answer is b. an element

The explanation:

when the ELEMENT is define as substance that cannot be decomposed (broken down) into simpler substances by ordinary chemical means. Examples: gold, iron, carbon, hydrogen, oxygen, nitrogen

Ex: diamond will be broken into carbon as well.

and SUBSTANCE: Material composed of only one kind of matter throughout (same atoms or same molecules).

5 0
3 years ago
Not sure how to answer this:
ahrayia [7]

Answer:

A. The red side is acidic.

B. Because it has more positive hydrogen ions.

C. The blue side is basic.

D. Because it has more negative hydroxide ion.

4 0
3 years ago
1. Newton’s second law of motion describes the relationship between force, mass, and acceleration. Write the equation.
rjkz [21]

Answer:

F=ma where F = force in N, m = mass in g and a = acceleration in m/s^{2}

7 0
3 years ago
A fungus is an organism whose cells have a. nuclei. c. chlorophyll. b. cell walls. d. both (a) and (b).
andrew11 [14]

Answer:

cell walls

Explanation:

looked it up on google

6 0
3 years ago
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